Electrical installation and debugging method for 110kV booster station

Abstract

The invention discloses an electrical installation and debugging method for a 110kV booster station, and aims to solve the problems of low precision, low efficiency, large potential safety hazard and the like in the aspects of equipment installation, wiring, debugging and the like in a traditional method. A laser positioning technology, a high-precision measuring instrument, electrical wiring software, big data analysis, artificial intelligence, automatic testing equipment, a perfect quality control and safety management system and the like are used; the installation precision is greatly improved, the wiring is optimized, the debugging efficiency and accuracy are improved, the quality control is enhanced, and the safety guarantee is enhanced. According to the method, the equipment installation precision error can be controlled within an extremely small range, the bus contact resistance is reduced to below 1 / 3 of that of a traditional mode, the cable fault checking time is shortened by more than 60%, the debugging time is shortened by 30%-40%, the data accuracy is improved by more than 95%, and the comprehensive construction cost is reduced by 10%-15%. The device is suitable for electrical installation and debugging engineering of various 110kV booster stations.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of booster station construction, in particular to a 110kV booster station electrical installation and debugging method. BACKGROUND

[0002] In modern power systems, 110kV booster stations are key hubs for power transmission and distribution. The quality and efficiency of their electrical installation and debugging work directly affect the safe and stable operation of the entire power system and power supply reliability. With the rapid economic development and continuous growth of social demand for electricity, the number of 110kV booster stations is increasing, and their scale is expanding, which puts higher requirements on their electrical installation and debugging work.

[0003] Traditional 110kV booster station electrical installation processes have many drawbacks. In the equipment installation link, due to the lack of standardized and refined work processes, equipment positioning deviation problems occur from time to time. For example, if the levelness and perpendicularity of the transformer are not strictly controlled within the specified range during installation, it may cause problems such as increased vibration and noise during operation, and in severe cases, it may even affect the service life of the transformer. In the process of installing the busbar, the traditional manual operation method cannot guarantee the tightness and consistency of the busbar connection, and it is easy to cause excessive contact resistance. This not only increases power loss, but also may cause local overheating when a large current passes through, threatening the safe operation of the booster station. According to relevant statistical data, booster station failures caused by busbar connection problems account for about 15%-20% of the total number of failures.

[0004] In terms of wiring, the traditional method often lacks reasonable planning and layout. A large number of cables crisscross within the booster station, not only affecting the overall aesthetics of the station, but also increasing the difficulty of later maintenance and troubleshooting. If cables of different voltage levels and functions are not effectively isolated, electromagnetic interference may occur, affecting the normal operation of secondary equipment. In some old 110kV booster stations, due to the confusion of cable wiring, there have been many cases of protection device malfunction caused by electromagnetic interference, posing a great risk to the safe operation of the power system.

[0005] The traditional 110kV booster station debugging method also has obvious shortcomings. In the preparation stage before debugging, the collection and analysis of technical data are not comprehensive and in-depth enough. Technical personnel often fail to fully understand the design principles and performance requirements of the equipment, resulting in difficulties in accurately determining the running state and parameters of the equipment during the debugging process. When debugging some new type of protection devices, due to insufficient understanding of their complex logic functions and technical details, technical personnel have difficulty in quickly and accurately setting parameters and verifying functions, thus prolonging the debugging period.

[0006] In the debugging process, the traditional method mainly relies on manual operation and experience judgment, lacking advanced automated testing means and precise data analysis tools. For example, when conducting no-load and load tests on transformers, manually reading and recording data is not only inefficient, but also prone to human error. For some minor fault risks, it is often difficult to detect by manual experience, leading to the device being discovered after running with faults for a period of time, increasing the risk of device damage and power outage accidents. When debugging complex secondary circuits, due to the lack of effective fault diagnosis tools, technicians need to spend a lot of time and effort to check one by one, seriously affecting the progress of the debugging work.

[0007] In addition, the traditional electrical installation and debugging method also has loopholes in quality control and safety management. In the installation process, there is a lack of strict quality detection and acceptance standards, making it difficult to ensure that each installation link meets the specification requirements. In the debugging stage, safety protection measures are not in place, which can easily lead to electrical accidents and threaten the safety of the debugging personnel. In some small power engineering, due to the lack of quality control and safety management, there have been many accidents of device damage due to unqualified installation quality and personnel electric shock injuries due to improper debugging operation.

[0008] In summary, the traditional 110kV booster station electrical installation and debugging method has many problems in device installation, wiring, debugging preparation, debugging process, and quality control and safety management, and cannot meet the high-quality and high-efficiency requirements of modern power systems for booster station construction. Therefore, it is of great practical significance and urgency to develop a scientific, efficient and safe 110kV booster station electrical installation and debugging method. SUMMARY

[0009] The purpose of the present application is to overcome the above-mentioned deficiencies and provide a 110kV booster station electrical installation and debugging method.

[0010] To achieve the above-mentioned purpose, the present application provides the following technical solution: a 110kV booster station electrical installation and debugging method, comprising the following steps:

[0011] S1, installation of GIS in the booster station;

[0012] S2, installation of high and low voltage panel cabinets in the booster station;

[0013] S3, installation of the main transformer;

[0014] S4, installation of SVG reactive power compensation device in the booster station;

[0015] S5, installation of outdoor power distribution device system;

[0016] S6, installation of partial cables and busbars in the booster station;

[0017] S7, Electrical equipment testing;

[0018] S8, commissioning of individual electrical system units and the entire system;

[0019] S9, control and AC / DC system installation and commissioning.

[0020] Preferably, the specific steps for installing the GIS at the booster station in step S1 are as follows:

[0021] S11, In the early stage, the GIS foundation is checked and the lines are marked. The equipment is unpacked and inspected and the accessories are counted. The main bus BUS transport unit is the first equipment to be placed. According to the manufacturer's packing list and the designer's instructions, the BUS unit packaging box is unpacked and hoisted into the installation site for assembly. Then, other bays and bus expansion joints are installed.

[0022] S12. After all parts are installed, install the voltage transformer and the incoming and outgoing bushings. During installation, ensure that the contact connection is reliable. First, install the inner shield and conductive rod, then put the outer equalizing ring on the bushing. Reliably treat the upper and lower sealing surfaces of the bushing as required.

[0023] S13, perform accessory installation, including the installation of SF6 inflation pipes for each air chamber, air pipe installation for pneumatic operating mechanisms, grounding of the casing and secondary wiring, etc.

[0024] S14 Before connecting each component, remove the protective cover of the basin insulator, and carefully wipe the surface of the basin insulator and the surface of the internal conductor with acetone using lint-free paper to ensure reliable contact of the sealing conductor and install the sealing ring. When installing the sealing ring, check the sealing surface and the surface of the sealing ring. If the sealing ring has problems such as deformation, cracking, or damage, replace it.

[0025] S15. After each component of the GIS forms an independent closed gas chamber and the adsorbent is replaced, a vacuum is drawn. After maintaining the vacuum for 4 hours, a vacuum leak test is performed. If the vacuum level doubles after 4 hours, it is normal. Continue to draw a vacuum for 2 hours, then fill the gas chamber with SF6 gas to the rated pressure of 0.5Pa. Before filling, check that the filling equipment and pipelines are clean, free of moisture and oil, and that there are no leaks at the pipeline connections. The moisture content of the newly filled SF6 gas should be <8mg / g.

[0026] S16, timely inspection of the product quality and installation quality of GIS complete sets of electrical appliances, including main circuit resistance measurement, air leakage detection, micro-water detection and main circuit AC withstand voltage test, etc.

[0027] Preferably, in step S2, the specific steps for installing the high and low voltage control panels of the booster station are as follows:

[0028] S21, the foundation steel installation adopts No. 8 channel steel, finds the highest point of the installation reference surface as the foundation channel steel elevation, and the foundation channel steel needs obvious and reliable grounding, is welded on the embedded part after correction;

[0029] S22, the disc, cabinet and internal equipment are firmly connected with each components, are welded and fixed with the foundation channel steel, and when installed in a row, the perpendicularity, horizontal deviation, disc and cabinet surface deviation and the allowed deviation between disc and cabinet joints are within the specified range;

[0030] S23, the copper bus is matched with the switch cabinet, is fixed by bolt connection and is firmly installed, and the bus lap joint surface is coated with electric power composite grease;

[0031] S24, the circuit breaker inspection and secondary circuit inspection are performed.

[0032] Preferably, the step S3, the specific steps of the main transformer installation are,

[0033] S31, the main transformer body is unloaded and placed, appearance inspection is performed in time after the equipment arrives at the site, the body appearance, oil tank and accessory conditions are checked, the sealing and gas pressure are checked, and the impact recorder is checked; the transformer foundation axis is rechecked before placement to ensure that the placement position and direction are correct, and the manual pushing device is used for placement;

[0034] S32, the insulating oil in the transformer body and the factory supplemented oil are subjected to simplified analysis, the supplemented oil is punched into the large oil tank by the vacuum oil filter and is further filtered to reach the standard;

[0035] S32, the insulating oil in the transformer body is discharged from the bottom oil discharge valve into the large oil tank by the vacuum oil filter, to prepare for the transformer body inspection and oil filtration;

[0036] S33, the transformer body inspection can be directly performed in the oil tank with or without a lifting cover, the lifting cover inspection is slowly and smoothly lifted by the 25t automobile crane to prevent the transformer body from colliding with the oil tank wall, the oxygen content is checked before the workers enter the oil tank during the inspection without the lifting cover, no irrelevant articles are carried and the tools and instruments are counted, the surrounding environment temperature and the transformer body temperature are ensured to meet the requirements during the transformer body inspection, the bolts, iron core, insulation, tap changer and the like are checked, and the oil tank bottom is washed and cleaned after the inspection with qualified transformer oil;

[0037] S34, accessory installation is performed, including removing the internal transportation support, connecting the internal lead, installing the cooler, oil pillow, bushing, no-excitation voltage regulation tap changer, gas relay, pressure release valve, temperature measuring device, control box and the like, and part of the accessories are installed after vacuum oiling according to the manufacturer's instruction book;

[0038] S35, after determining the relevant installation work is completed, vacuumizing the transformer, isolating the accessories that cannot bear the vacuum mechanical strength, checking the sealing condition, injecting the qualified transformer oil to the specified position after reaching the specified vacuum degree and maintaining for more than 8 hours, and then releasing the vacuum after maintaining for more than 4 hours;

[0039] S36, the transformer is supplemented with oil and exhausted from each air vent plug until the oil pot is full of oil and passes the leakage test, the oil level is adjusted to normal after the exhaust, and the oil injection is completed and remains static for more than 72 hours;

[0040] S37, adjustment and test are carried out according to the regulations and manufacturer's instructions before the transformer is put into operation;

[0041] S38, the installation operation instruction book is prepared and explained, the tools and instruments are checked, the whole process of the insulating oil is controlled, the samples are strictly taken and tested at each link, the body is checked or the internal wire connection is carried out in the sunny day without wind and the relative humidity of air is less than 75%, the exposure time of the controller body is controlled, the workers wear special working clothes, the accessories to be vacuumized are checked before vacuumizing, the accessories that are not allowed to be vacuumized are isolated, the accessories, the interface and the welding seam are checked for oil leakage after vacuum oil injection, and the transformer is installed and tested according to the regulations and manufacturer's instructions and the test report is issued.

[0042] Preferably, the specific steps of step S4, installation of the SVG reactive compensation device of the booster station, are as follows:

[0043] After receiving the device, the appearance is checked, then the parts are accepted according to the technical requirements, and then the SVG is installed according to the SVG assembly drawing, the capacitors in each phase are adjusted to have a difference of not more than 5% when the capacitor groups are adjusted, copper-aluminum transition pieces are installed at the copper and aluminum contact conductive surfaces, the operation mode is checked according to the SVG capacitors in each phase, and it is ensured that the high-order harmonic point is deviated.

[0044] Preferably, the specific steps of step S5, installation of the outdoor power distribution device system, are as follows:

[0045] S51, installation of the circuit breaker:

[0046] The height and levelness of the end of the circuit breaker ground bolt are checked with a level, the steel structure support is installed and the levelness and perpendicularity are adjusted under the guidance of the factory personnel, the ground bolt is fastened, the pole and the arc extinguishing chamber are hoisted and assembled, foreign matters are prevented from falling into during assembly, the flange surface is wiped and the sealing ring is padded, the bolt is fastened, the gas pipeline is connected and the cleanliness is checked, the sealing is checked after vacuumizing, the qualified gas is filled, and the sealing and the content of micro water are checked after filling;

[0047] S52, installation of the isolation cabinet:

[0048] When unpacking, the owner, supervisor and construction unit check and accept and record, check components, accessories, spare parts, porcelain parts, etc. During installation, control the distance between phases, the verticality of insulators and the connection of each component, the installation of transmission devices and operating mechanisms meets the requirements, check the contact of conductive parts and appearance;

[0049] S6, mutual inductor installation:

[0050] S61, capacitor voltage transformer installation:

[0051] Install the capacitor according to the number, ensure firm connection during assembly, prevent tilting during hoisting, measure the verticality after installation, paint the phase sequence, connect the grading ring, wire terminal and ground;

[0052] S62, current transformer installation:

[0053] Hoist horizontally outside the box, then vertically hoist and install on the bracket, adjust the verticality, remove the transportation support pad and paint the phase color identification, finally ground, pay attention to ratio adjustment and direction during installation.

[0054] Preferably, the specific steps of step S6, installation of part of the cable and bus in the booster station, are as follows:

[0055] S61, bus installation: first install the framework soft wire, then install the device connection, the wire installation length is calculated by measuring the framework hanging point distance, height difference, insulator string and fitting length, considering wire sag and tension, the device connection and main bus downlead length is measured according to the position of the clamp and a margin is reserved, the strain wire is unwound, crimped and combined, the appearance is checked after crimping, the interval rod is installed after the double wire combination, the strain wire can be hung by a truck crane combined with a bulldozer traction or manual winching traction, the bus downlead and device connection installation needs to be done after the bus erection is completed, and the pre-crimping test assembly is required;

[0056] S62, cable construction: the cable pipe is laid to ensure the distance, height consistency and be on a straight line, the cable is laid in layers, and the binding is uniformly required.

[0057] Preferably, the specific steps of step S7, electrical equipment test, are as follows:

[0058] S71, transformer test: measure the DC resistance of the winding together with the sleeve, check the transformer ratio and wiring group of all taps, measure the insulation resistance and absorption ratio of the winding together with the sleeve, and perform insulation oil test;

[0059] S72, current transformer test: measure insulation resistance of winding and insulation resistance of end shield to ground, measure dielectric loss tangent tgδ of primary winding together with bushing and dielectric loss tangent tgδ of end shield to ground, measure excitation characteristic curve of current transformer, check polarity and transformation ratio of current transformer lead;

[0060] S73, voltage transformer test: measure insulation resistance of transformer, measure DC resistance of primary winding, check polarity of transformer lead, measure no-load current and transformation ratio of transformer, measure dielectric loss tangent tgδ of primary winding together with bushing;

[0061] S74, circuit breaker test: perform mechanical characteristic test, measure insulation resistance of insulation pull rod, measure resistance of each phase conducting loop, measure breaking and closing time and synchronism of circuit breaker, measure breaking and closing speed of circuit breaker, measure insulation resistance and DC resistance of circuit breaker breaking and closing coil, perform test of circuit breaker operating mechanism, measure trace water content and sealing property of SF6 gas in circuit breaker, check gas density relay, pressure gauge and pressure operated valve.

[0062] Preferably, the step S8, the specific steps of electrical system unit and system debugging are,

[0063] S81, main transformer protection debugging: perform AC analog quantity precision and phase checking, input quantity checking, main transformer differential protection debugging and secondary circuit checking;

[0064] S82, bus protection debugging: perform precision checking, input and output checking, version checking;

[0065] S83, line protection checking: perform precision checking, version checking, input and output checking;

[0066] S84, whole set test: perform bus differential protection whole set test, bus coupler failure and dead zone protection whole set test, bus coupler overcurrent whole set test, line protection whole set test.

[0067] Preferably, the step S9, the specific steps of control and AC / DC system installation and debugging are,

[0068] S91, panel cabinet installation: make frame foundation according to panel cabinet outer dimension and design institute foundation drawing, transport panel cabinet to position and fix, cooperate with manufacturer to install protection device and wire;

[0069] S92, protection device test and debugging: measure insulation resistance, perform power frequency withstand voltage test, check intermediate and time relays, perform protection device power-on test;

[0070] S93, battery installation and charge-discharge: install and connect the battery in the cabinet, check the output voltage, select the charging method according to the battery terminal voltage, and operate and record the charge-discharge process step by step;

[0071] S94, grounding and lightning rod engineering of the booster station: the 35kV system of the booster station adopts a small resistance grounding mode.

[0072] Compared with the prior art, the beneficial effects of the present application are:

[0073] Improve installation precision and stability: the 110kV booster station electrical installation method proposed in the present application uses advanced laser positioning technology and high-precision measuring instruments to accurately position the equipment installation position. During the transformer installation process, the laser positioning system can control the horizontal and vertical error within ±0.5mm, which is more than 50% higher in precision than the traditional method. Special busbar connecting tools and processes are used to ensure tight busbar connection, and the contact resistance can be reduced to less than 1 / 3 of the traditional connection method, effectively reducing power loss and local overheating risk, greatly improving the stability and reliability of equipment operation.

[0074] Optimize wiring and post-maintenance: in the wiring design stage, professional electrical wiring software is used for simulation and optimization to realize reasonable planning and orderly layout of the cable. Different voltage levels and functions of the cable are effectively isolated to reduce electromagnetic interference. At the same time, during the cable laying process, clear line slot and bridge are used to provide great convenience for post-maintenance and fault troubleshooting. According to actual case statistics, after using the new method, the cable fault troubleshooting time is shortened by more than 60%, significantly improving the maintenance efficiency of the booster station.

[0075] Improve debugging efficiency and accuracy: before debugging, big data analysis and artificial intelligence technology are used to comprehensively and deeply analyze and learn the device technical data, so that technical personnel can quickly and accurately master the key technical parameters and performance requirements of the device. During the debugging process, automatic test equipment and intelligent data analysis system are introduced to realize real-time monitoring and accurate analysis of the device operating parameters. Taking the transformer test as an example, the automatic test equipment can complete a large amount of data collection and processing in a short time, and the data accuracy is improved by more than 95% compared with manual operation, while the debugging time is shortened by 30%-40%, greatly improving the efficiency and accuracy of debugging work.

[0076] Strengthen quality control and safety guarantee: A perfect quality control system is established, and strict quality detection standards and acceptance procedures are formulated for each link from equipment procurement, installation to commissioning. Advanced non-destructive testing technology and online monitoring system are adopted to monitor and evaluate the installation quality in real time, ensuring that every installation detail meets the specification requirements. In terms of safety management, intelligent safety protection equipment and early warning system such as leakage protection device, fire alarm system, etc. are equipped to provide comprehensive safety protection for commissioning personnel. Since the implementation of the method, no equipment failure caused by installation quality problems and no safety accidents caused by improper commissioning operation have occurred in related projects.

[0077] Reduce comprehensive cost: By improving installation precision and commissioning efficiency, equipment failure and maintenance frequency are reduced, and the whole life cycle cost of equipment is reduced. Optimizing wiring and reasonably planning construction process can reduce material waste and labor cost. According to the analysis of actual engineering cases, compared with the traditional method, the construction comprehensive cost of 110kV booster station can be reduced by 10%-15% by using the electrical installation and commissioning method of the present application, which has significant economic benefits. DETAILED DESCRIPTION

[0078] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0079] The present application provides the following technical solutions: a 110kV booster station electrical installation and commissioning method.

[0080] The 110kV booster station includes the following contents:

[0081] 1. 110kV booster station electrical equipment unloading, unpacking inspection, acceptance, installation and commissioning, trial operation, and completion acceptance.

[0082] 2. Booster station lightning protection grounding engineering (including main grounding network in booster station, surface grounding network in building, and responsible for reliable connection of housings and grounding terminals of all electrical equipment with main grounding network).

[0083] Test procedure: test preparation, electrical equipment single commissioning, electrical equipment system commissioning, electrical equipment whole system commissioning, and joint debugging.

[0084] The commissioning scope of the 110kV booster station and line EPC general contracting project of the 400000kW wind power project of State Energy Group Shenmu includes electrical, instrument, and communication debugging within the scope of 110kV booster station.

[0085] In order to achieve the above object, the present application provides the following technical scheme: a 110kV step-up station electrical installation and debugging method, comprising the following steps:

[0086] S1, step-up station GIS installation;

[0087] S2, step-up station high and low voltage panel installation;

[0088] S3, main transformer installation;

[0089] S4, step-up station SVG reactive power compensation device installation;

[0090] S5, outdoor power distribution device system installation;

[0091] S6, step-up station internal partial cable and bus installation;

[0092] S7, electrical equipment test;

[0093] S8, electrical system single and system debugging;

[0094] S9, control and AC / DC system installation and debugging.

[0095] Specifically, the step S1, the specific steps of step-up station GIS installation are,

[0096] S11, preliminary verification of GIS foundation and line marking, equipment unpacking acceptance and accessory counting, taking the main bus BUS transportation unit as the first equipment in place, according to the manufacturer's packing list and the designer's instructions, unpacking the BUS unit package box and hoisting into the installation site for assembly, and then installing other intervals and bus expansion joints;

[0097] S12, after the installation of each part is completed, install the voltage transformer and the in-out line sleeve, ensure reliable contact at the contact connection during installation, first install the inner shield cover and the conductive rod, and then install the outer equalizing ring on the sleeve, and reliably process the upper and lower sealing surfaces of the sleeve according to the requirements;

[0098] S13, accessory installation, including SF6 gas filling pipeline installation of each gas chamber, air pipeline installation of pneumatic operating mechanism, shell grounding and secondary wiring, etc.;

[0099] S14, before connecting each part element, remove the protective cover of the basin-type insulator, carefully wipe the surface of the basin-type insulator and the surface of the internal conductor with acetone dipped in lint-free paper, ensure reliable contact of the sealed conductor for connection and install the sealing ring, check the sealing surface and the surface of the sealing ring when installing the sealing ring, and replace if the sealing ring has problems such as deformation, cracking and damage;

[0100] S15, after forming independent closed gas chamber of GIS each element and replacing adsorbent, vacuumizing, keeping vacuum for 4 hours, vacuum leak detection, if 4 hours vacuum degree rising 1 times is normal, continuing vacuumizing for 2 hours, filling SF6 gas to rated gas pressure 0.5Pa, checking filling equipment and pipeline before filling, which should be clean, no moisture, no oil stain, pipeline connection part has no leakage, new filled SF6 gas moisture content should be <8mg / g;

[0101] S16, detecting product quality and installation quality of GIS complete combined electric appliance in time, detection items include main loop resistance measurement, gas leakage detection, micro water detection and main loop AC withstand voltage test.

[0102] Specifically, the specific steps of installing high and low voltage panel cabinet of the step S2 are,

[0103] S21, foundation channel steel is used for installation, the highest point of installation reference surface is found as foundation channel steel elevation, the foundation channel steel needs obvious and reliable grounding, and is welded on embedded part after correction;

[0104] S22, panel, cabinet and internal equipment and each component are connected firmly, and are fixed by welding with foundation channel steel, when installing in a row, the perpendicularity, horizontal deviation, panel and cabinet surface deviation and the allowed deviation between panel and cabinet joints are within the specified range;

[0105] S23, copper busbar is matched with switch cabinet, is fixed by bolt connection and is installed firmly, and the busbar lap joint surface is coated with electric power composite grease;

[0106] S24, breaker inspection and secondary loop inspection are performed.

[0107] Specifically, the specific steps of installing main transformer of the step S3 are,

[0108] S31, main transformer body is unloaded and placed, appearance inspection is performed in time after equipment arriving at the site, the body appearance, oil tank and accessory conditions are checked, the sealing and gas pressure are inspected, and the impact recorder is checked; the transformer foundation axis is checked and re-measured before placement, so as to ensure that the placement position and direction are correct, and the artificial uses pushing device to place;

[0109] S32, the insulating oil in the transformer body and the factory supplemental oil are subjected to simplified analysis, the supplemental oil is punched into the large oil tank by vacuum oil filter, and is further filtered to reach the standard;

[0110] S32, the insulating oil in the transformer body is discharged from the bottom drain valve into the large oil tank by vacuum oil filter, so as to check the body and filter the oil;

[0111] S33, transformer body inspection can be checked directly into the tank with or without cover, cover inspection with 25 t car slow and stable lifting, prevent the body and tank wall collision, without cover inspection when the staff into the tank before checking the oxygen content, not carrying irrelevant items and inventory tools, body inspection to ensure that the ambient temperature and body temperature meet the requirements, check the bolt, core, insulation, tap switch, etc., after the inspection with qualified transformer oil flushing and cleaning the bottom of the tank;

[0112] S34, accessory installation, including removing internal transport support, connecting internal lead, installing cooler, oil pillow, sleeve, no excitation voltage regulating tap changer, gas relay, pressure relief valve, temperature measuring device, control box, etc., part of the accessories are installed according to the manufacturer's manual after vacuum oil injection;

[0113] S35, after determining that the related installation work is completed, vacuumize the transformer, isolate the accessories that cannot withstand the vacuum mechanical strength, check the sealing condition, reach the specified vacuum degree and maintain for more than 8 hours, then inject qualified transformer oil to the specified position, maintain for more than 4 hours, and then release the vacuum;

[0114] S36, the transformer is filled with oil and exhaust from each exhaust plug until the oil pillow is full of oil and the leakage test is qualified, then adjust the oil level to normal after the second exhaust, and the oil injection is completed after 72 hours of static;

[0115] S37, before the transformer is put into operation, adjust and test according to the regulations and manufacturer's manual;

[0116] S38, prepare the installation operation instruction and hand over, check the tools and tools; Control the whole process of insulating oil, strictly sample and test at each link; Body inspection or internal line connection is carried out in sunny day, air relative humidity is less than 75%, control the exposure time of the body, and the workers wear special working clothes; Check the accessories that should be vacuumized before vacuumizing, and isolate the accessories that are not allowed to be vacuumized; Check the leakage of accessories, interfaces and welds after vacuum oil injection; Strictly install and test the transformer according to the regulations and manufacturer's manual, and issue the test report.

[0117] Specifically, the specific steps of step S4, installation of SVG reactive power compensation device of booster station, are as follows,

[0118] After receiving the device, first check the appearance, then check according to the technical requirements of each part, and then install according to the SVG group frame assembly drawing. When adjusting the capacitor group, the capacitance difference of each phase should not exceed 5%. Copper-aluminum transition sheets are installed at the copper and aluminum contact conductive surfaces. The operation mode is checked according to the capacitance and reactance values of the SVG capacitors to ensure that the deviation from the high harmonic point.

[0119] Specifically, the specific steps of step S5, installation of outdoor power distribution device system, are as follows,

[0120] S51, circuit breaker installation:

[0121] Check the height and levelness of the circuit breaker bolt end with a level. Install in sunny and windless weather. First, install the steel structure support and adjust the levelness and verticality under the guidance of the plant personnel. Then, tighten the bolt, hoist the pole and arc chamber, and assemble. Prevent foreign matter from falling into the assembly. Wipe the flange surface and pad the sealing ring. Tighten the bolt. Connect the gas pipeline and check the cleanliness. Then, check the seal under vacuum. Fill the qualified gas. After filling, check the seal and the content of micro water.

[0122] S52, isolation cabinet installation:

[0123] Check and record the components, accessories, spare parts, and porcelain parts when opening the box. Control the distance between phases, the verticality of insulators, and the connection of components during installation. The transmission device and operating mechanism meet the requirements. Check the contact of the conducting part and the appearance.

[0124] S6, mutual inductor installation:

[0125] S61, capacitor voltage transformer installation:

[0126] Install the upper capacitor according to the number. Ensure firm connection during assembly. Prevent tilting during hoisting. Measure the verticality after installation. Paint the phase sequence. Connect the equalizing ring and terminal and ground.

[0127] Capacitor voltage transformer installation

[0128] a Each capacitor voltage transformer consists of two sections of dividing capacitors and an oil-immersed base box. The base box contains an intermediate transformer, series reactor, and auxiliary devices. The lower capacitor is already assembled with the base box when delivered. The upper capacitor should be installed according to the number on the base box nameplate. Do not arbitrarily replace it.

[0129] b Upper capacitor assembly: securely tie nylon lifting straps to the upper part of the porcelain sleeve of the upper capacitor. Ensure that the capacitor can be lifted vertically. Use a 25t crane to lift the upper capacitor above the lower capacitor. Connect the terminal of the lower capacitor (black wire) on the upper end plate to the bottom plate of the upper capacitor. Tighten the connecting bolt to 27Nm. Then align the nameplates of the upper and lower capacitors (the lower capacitor nameplate should be aligned with the base box nameplate). Use M12 bolts (supplied by the factory) to securely connect and fix the upper and lower capacitors.

[0130] c After the upper capacitor is assembled, lift it from the lifting hole on the mutual inductor base box. Use nylon lifting straps. Before lifting, securely tie a waist rope to the upper capacitor of the mutual inductor to prevent tilting during hoisting.

[0131] d Use 25t crane to hoist the transformer to the foundation support, and fasten it with M20 bolts. Pay attention to prevent local over-tightening, which may cause deformation of the bottom cover and leakage. Ensure that the overall inclination of the transformer is not greater than 2 / 1000 (mm).

[0132] e Apply yellow, green and red phase sequence paint to the grading rings of the voltage transformer according to phases A, B and C respectively.

[0133] f The grading rings and primary connection terminals of the capacitive voltage transformer are fixed on the top cover of the capacitive divider by bolts.

[0134] g Use soft copper braided wire with a cross-section not less than 25 mm2 to reliably connect the grounding terminal on the bottom box of the transformer to the ground net.

[0135] h After the capacitive voltage transformer is hoisted into place, its perpendicularity should be measured, and the error should not exceed 4 mm.

[0136] S62, current transformer installation:

[0137] Hoist it horizontally outside the box, then vertically install it on the support, adjust the perpendicularity, remove the transport support pads and apply phase color markings. Finally, ground it. Pay attention to the ratio adjustment and direction during installation.

[0138] Current transformer installation

[0139] a The current transformer is horizontally packaged for transportation. After unpacking the box, tie two steel wire hangers to the two hangers on the top tank and the two hangers at the foot (4 hangers must be used simultaneously), and hoist the transformer horizontally outside the box and place it on a flat surface.

[0140] b Untie the hangers at the foot, use the two hangers at the top tank (two hangers must be used simultaneously) to slowly hoist, hoist the transformer vertically, then continue to hoist it onto the transformer support, and reliably fix the transformer foot to the support top plate with the corresponding bolts, and untie the hangers.

[0141] c After the transformer is installed in place, its perpendicularity should be detected. If there is obvious inclination, use shims to support the foot to adjust it so that the inclination error is controlled within 3 mm.

[0142] d After the transformer is installed, open the top tank expander protection cover, remove all support pads used to protect the expander during transportation, and at the same time, apply two symmetrical phase color markings on the outer surface of the protection cover. The phase color markings should be painted as a 100 mm diameter circle.

[0143] e Finally, use soft copper braided wire with a cross-section not less than 25 mm2 to reliably connect the grounding terminal on the bottom foot of the transformer to the ground net.

[0144] The current transformer will be adjusted in the following ratio, hung on the bracket with nylon sling, and evenly fastened with foot bolts. The bolts should be inserted from top to bottom. Pay attention to L1(P1) to the bus side and L2(P2) to the load side.

[0145] The voltage transformer, capacitor voltage divider and electromagnetic unit of the capacitor voltage transformer are supplied as a complete set and should be installed according to the numbers on the nameplates. They should not be replaced arbitrarily. For the capacitor voltage transformer with multiple capacitor units, the units should be installed in sections, and the connecting bolts of each part should be fastened symmetrically and evenly. The units should not be lifted from the top of the capacitor and should be lifted by the lifting holes on the oil tank of the electromagnetic unit. The high-voltage connection terminals are fixed on the upper cover of the capacitor voltage divider or the connection terminal plate by bolts.

[0146] Specifically, the specific steps of the step S6, the installation of the partial cable and bus in the booster station, are as follows.

[0147] S61, bus installation: first install the framework soft conductor, then install the equipment connection, the conductor installation length is calculated by measuring the framework hanging point distance, height difference, insulator string and fitting length, considering the conductor sag and tension, the equipment connection and main bus down lead length is measured according to the position of the clamp and a margin is reserved, the strain conductor is laid, crimped and combined, the appearance is checked after crimping, the spacer rod is installed after the double conductor is combined, the strain conductor can be lifted by a truck crane and pulled by a bulldozer or manually twisted and pulled, the bus down lead and equipment connection installation needs to be carried out after the bus is erected, and the pre-assembly is tested before crimping.

[0148] S62, cable construction: the cable pipe is laid to ensure the distance, height consistency and straight line, the cable is laid in layers, and the binding is uniformly required.

[0149] Measurement of the length of the equipment connection and main bus down lead

[0150] According to the specific position of the clamp (T-shaped clamp or equipment clamp), the clamp is installed on the equipment connection plate, measured by a steel tape from the clamp port, and the length is determined after observing the arc and reserving a proper margin.

[0151] 3) Strain conductor laying, crimping and combination

[0152] a. Lay the soft conductor of the corresponding specification, use the actual length of the conductor calculated and measured to measure the conductor, mark the accurate position, and cut off the conductor with a wire cutter after tightening the two sides with a binding wire.

[0153] b. During the laying process, the conductor should not be directly dragged on the ground. In order to prevent the conductor from being scratched, a rubber or wooden board should be laid on the ground, and the quality of the conductor should be checked.

[0154] c. Clean the surface of the conductor and the contact surface of the clamp of the oxide film and coat with electric power composite grease.

[0155] d. Determine the cutting position of the conductor according to the length of the steel anchor, and cut the strands of the steel core while removing dirt.

[0156] e. The sequence of pressure connection is as follows: first, put the conductive aluminum pipe of the strain clamp into the conductor, with the wire connection plate of the clamp facing the outer end of the conductor, then cut off the aluminum core of the conductor and reserve the steel core. Do not damage the steel core when cutting. First, press the steel anchor part, then pull the aluminum pipe onto the pressed steel anchor for secondary pressure connection.

[0157] f. To ensure the quality of pressure connection, the appearance should be checked after pressure connection. The size of the opposite sides of the hexagon after pressure connection should be 0.866D. If the size of any one opposite side exceeds 0.866+0.2mm, the steel mold should be replaced.

[0158] g. For double conductors, the two conductors of each phase are combined at both ends with V-shaped connecting plates. Slowly lift the conductors with steel wire ropes and reverse chains to about 1 meter from the ground, so that the two conductors are in a natural state of suspension, then mark every 2 meters and install a spacer at the marked position.

[0159] Hanging and connecting of strain conductors

[0160] a) One end of the overhead strain conductor is lifted by a car crane, and the assembled insulator string and conductor are hung on the wire hanging ring of the steel beam. Before lifting, adjust the insulator string so that the bowl opening direction is upward.

[0161] b. There are two methods for tightening the wire. One is to use a 55 horsepower bulldozer to pull on the other side of the tightening frame, using a 45° angle outside the frame to tighten the wire and hang it in place. During construction, the speed of the bulldozer should be as slow as possible. The traction rig is φ13 steel wire rope and 5t pulley. The other method is to use manual winch traction. The depth of the winch anchor should be greater than 1.5 meters, and the angle between the traction rope and the traction anchor pit should not be greater than 45°.

[0162] 5) Installation of busbar down conductor and equipment connection

[0163] The installation of down conductor and equipment connection should be after the completion of busbar erection and before pressure connection. The conductor should be tested for assembly to prevent twisting, and then installed after the two end clamps are pressed. After the installation of the conductor, the three-phase relaxation should be consistent.

[0164] Cable construction

[0165] 1) Cable sleeve installation: When laying the cable pipe, ensure that the spacing of the row of cable pipes is consistent, the pipe height is consistent, and they are in a straight line.

[0166] 2) Power cable process: In order to improve the cable laying construction process, the technical personnel should carefully understand the construction drawings and the construction site before the cable laying, use the computer to carry out the secondary design of the cable laying, compare the cable laying path specified by the design institute, and recompile the detailed cable laying list to guide the cable laying construction, so that the cable laying is more neat and the cable crossing is avoided.

[0167] 3) Cable laying requirements: The cables are laid in layers, from top to bottom, power cable, control cable, signal cable, and the diameters of the cables laid in the same layer are as consistent as possible. The same color of binding line is selected, and a binding is made every interval, the binding interval meets the specification requirements, and the cable is neat and firm.

[0168] Specifically, the specific steps of the electrical equipment test are:

[0169] S71, transformer test: measure the DC resistance of the winding together with the bushing, check the transformation ratio and the connection group of all taps, measure the insulation resistance and absorption ratio of the winding together with the bushing, and perform insulation oil test;

[0170] S72, current transformer test: measure the insulation resistance of the winding and the insulation resistance of the end screen to ground, measure the dielectric loss tangent tgδ of the primary winding together with the bushing and the dielectric loss tangent tgδ of the end screen to ground, measure the excitation characteristic curve of the current transformer, and check the polarity and transformation ratio of the transformer lead;

[0171] S73, voltage transformer test: measure the insulation resistance of the transformer, measure the DC resistance of the primary winding, check the polarity of the transformer lead, measure the no-load current and transformation ratio of the transformer, and measure the dielectric loss tangent tgδ of the primary winding together with the bushing;

[0172] S74, circuit breaker test: perform mechanical property test, measure the insulation resistance of the insulation pull rod, measure the resistance of each phase conducting loop, measure the opening and closing time and synchronism of the circuit breaker, measure the opening and closing speed of the circuit breaker, measure the insulation resistance and DC resistance of the opening and closing coil of the circuit breaker, perform test on the operating mechanism of the circuit breaker, measure the trace water content and sealing property of SF6 gas in the circuit breaker, and check the gas density relay, pressure gauge and pressure operated valve.

[0173] Transformer test

[0174] 1) Measure the DC resistance of the winding together with the bushing.

[0175] a. Use the DC resistance tester to measure the DC resistance of the high voltage side AB, BC and CA of the transformer. The measurement should be performed at all positions of the three taps, and the mutual difference value of the measured values of each line should be less than 1% of the average value.

[0176] b Measure the DC resistance of the low voltage side of the transformer, ao, bo, co, respectively, with a DC resistance tester. The difference between the measured values of each phase should be less than 2% of the average value.

[0177] 2) Check the transformation ratio of all taps and the connection group.

[0178] Measure the transformation ratio of the transformer AB / ab, BC / bc, CA / ca, respectively, with a 3628D full-automatic transformation ratio tester. The measurement should be performed on all taps.

[0179] 3) Measure the insulation resistance and absorption ratio of the winding together with the bushing.

[0180] Measure the insulation resistance and absorption ratio of the high voltage side of the transformer to the low voltage side and ground with a 2500V megohmmeter, and measure the insulation resistance of the low voltage winding to ground with a 25000V megohmmeter.

[0181] 4) Insulation oil test.

[0182] Perform an electrical strength test on the insulation oil with an oil withstand tester, adjust the electrode gap to 2.5mm, turn on the power switch of the tester, and measure through the menu selection automatic measurement function key. The breakdown voltage should not be less than 25kV.

[0183] Current transformer test

[0184] 1) Measure the insulation resistance of the winding and the insulation resistance of the end shield to ground.

[0185] a Measure the insulation resistance of the primary winding to the secondary winding and the shell, and the insulation resistance between each secondary and ground with a 2500V megohmmeter. When measuring, the non-tested winding is short-circuited to ground, and after measurement, discharge first and then remove the ground wire. The measured insulation resistance value should not be significantly different from the factory test value.

[0186] b Measure the insulation resistance of the end shield to ground with a 2500V megohmmeter. After measurement, discharge first and then remove the ground wire. The insulation resistance value should not be less than 1000MΩ.

[0187] 2) Measure the dielectric loss tangent tgδ of the primary winding together with the bushing and the dielectric loss tangent tgδ of the end shield to ground.

[0188] 3) Measure the excitation characteristic curve of the current transformer: only for the protection level secondary winding

[0189] 4) Check the polarity of the transformer lead.

[0190] 5) Check the transformation ratio of the transformer.

[0191] 7.4.8.3 Voltage transformer test:

[0192] 1) Measure the insulation resistance of the transformer.

[0193] a Measure the insulation resistance of the primary winding to the secondary winding and to ground, respectively, using a 2500V megohmmeter. The insulation resistance should be greater than 100MΩ.

[0194] b Measure the insulation resistance of each secondary winding to ground and between secondary windings, respectively, using a 1000V megohmmeter. The insulation resistance should be greater than 100MΩ.

[0195] After measuring the insulation resistance, fully discharge the transformer before proceeding to the next test.

[0196] 2) Measure the DC resistance of the primary winding.

[0197] Use a QJ23 single-arm bridge to measure the DC resistance of the primary winding of the A, B, and C phase transformers. The measured value should not differ significantly from the factory value or the measured value of the same type of product from the same batch.

[0198] 3) Check the polarity of the lead wires of the transformer.

[0199] 4) Measure the no-load current of the transformer.

[0200] 5) Measure the transformation ratio of the transformer.

[0201] The ratio should match the manufacturer's nameplate.

[0202] 6) Measure the dielectric loss tangent tgδ of the primary winding together with the bushing.

[0203] Circuit breaker test

[0204]

[0205] 1) Measure the insulation resistance of the insulation pull rod:

[0206] Use a 2500V megohmmeter to measure the insulation resistance of the lower break of the circuit breaker, i.e., the insulation resistance of the insulation pull rod. The insulation resistance should be no less than 6000MΩ.

[0207] 2) Measure the resistance of each phase conducting loop:

[0208] Place the circuit breaker in the closed position and use an HLDZ-1 loop resistance meter to measure the resistance of the conducting loops of the A, B, and C phases.

[0209] 3) Measure the opening and closing times and synchronism of the circuit breaker:

[0210] Use a KC-98H4 switch mechanical property tester to simultaneously measure the opening and closing times and synchronism of the circuit breaker. This test should be performed at the rated operating voltage and hydraulic pressure of the circuit breaker.

[0211] 4) Measure the opening and closing speed of the circuit breaker.

[0212] This test is provided by the manufacturer with the special measuring accessories.

[0213] 5) Measure the insulation resistance and DC resistance of the opening and closing coil of the circuit breaker.

[0214] a Measure the insulation resistance of the opening and closing coil of the circuit breaker with a megohmmeter at 1000V. The measured insulation resistance should not be less than 10MΩ.

[0215] b Measure the DC resistance of the opening and closing coil of the circuit breaker with a QJ23 single-arm bridge. The measured DC resistance should not be significantly different from the test value at the factory.

[0216] 6) Test of the operating mechanism of the circuit breaker.

[0217] a Closing operation: The circuit breaker should reliably close when the operating voltage is at 85% and 110% of the rated voltage.

[0218] b Opening operation: The circuit breaker should reliably open when the operating voltage is at 65% of the rated voltage, and should not open when the operating voltage is less than 30% of the rated voltage.

[0219] 7) Measure the trace water content of the SF6 gas in the circuit breaker.

[0220] The trace water content of the SF6 gas in the circuit breaker should meet the following requirements:

[0221]

[0222] a The gas chamber connected to the arc-extinguishing chamber should be less than 150ppm;

[0223] b The gas chamber not connected to the arc-extinguishing chamber should be less than 500ppm;

[0224] c The measurement of trace water should be carried out after the circuit breaker has been filled with gas for 24 hours.

[0225] 8) Sealing test.

[0226]

[0227] a When using a leak detector with a sensitivity of not less than 1×10-6 (volume ratio) to detect the sealed parts, pipe joints, etc. of the circuit breaker, the leak detector should not alarm;

[0228] b The measurement of leakage value should be carried out after the circuit breaker has been filled with gas for 24 hours.

[0229] 9) Calibration of the gas density relay, pressure gauge and pressure-actuated valve.

[0230]

[0231] The action value of the gas density relay and the pressure action valve shall meet the provisions of the product technical conditions, and the error of the pressure gauge indication value and its variation shall be within the allowable range of the corresponding grade of the product

[0232] Specifically, the specific steps of the step S8, the electrical system monomer and system debugging are,

[0233] S81, main transformer protection debugging: AC analog quantity accuracy and phase checking, input quantity checking, main transformer differential protection debugging and secondary circuit checking are performed;

[0234] 1) AC analog quantity accuracy and phase checking:

[0235] The current loop is connected in series with the same polarity, the voltage loop is connected in parallel with the same polarity, 5A current and 57.7V voltage are added, 0.5-level meter is connected for monitoring, the display value is checked, and the error should be less than ±5%.

[0236] Three-phase current and three-phase voltage are added, and the current and voltage phases should be correct.

[0237] 2) Input quantity checking:

[0238] 3) Main transformer differential protection debugging:

[0239] a Differential speed break testing:

[0240] A current is added to phase A (B, C) to reach the differential speed break setting value, the protection should reliably export, the action value and the setting value error should be no more than ±5%, and the action time is recorded.

[0241] b Ratio differential testing:

[0242] CT is disconnected, and a current is added to any phase of high and low to reach the differential setting value, the protection should reliably export, the action value and the setting value error should be no more than ±5%, and the action time is recorded.

[0243] c Ratio brake coefficient testing;

[0244] d Secondary harmonic coefficient testing;

[0245] e Compound voltage overcurrent testing;

[0246] Under the setting value, voltage and current are added to the setting value, the device should reliably act, the action value and the setting value error should be no more than ±5%, and the action time limit error should be no more than ±5%.

[0247] f Sequence current protection testing:

[0248] Under the setting value, a single-phase grounding is simulated, the device should reliably act, the action value and the setting value error should be no more than ±5%, and the action time limit error should be no more than ±5%.

[0249] g Gap sequence over-current protection test:

[0250] Under the setting value, the current is charged to the setting value, and the device should act reliably. The error of the action value and the setting value is not more than ±5%, and the error of the action time limit is not more than ±5%.

[0251] 4) Secondary circuit inspection: including insulation resistance inspection and wiring inspection.

[0252] S82, bus protection debugging: precision check, input and output check, version check;

[0253] 1) Precision check

[0254] Connect the current loop in series with the same polarity, and pass in the rated AC current, paying attention not to open the circuit; connect the voltage loop in parallel with the same polarity, and pass in the rated AC voltage, paying attention not to short circuit. Observe the effective value and phase of each channel, which should not exceed ±1% compared with the 0.5 level meter, the voltage average error should not exceed ±2%, and the phase should not exceed ±1°. Remove the above AC connection, pass in the rated three-phase AC current and voltage, and observe the effective value and phase of each channel.

[0255] 2) Input and output check.

[0256] 3) Version check.

[0257] S83, line protection verification: precision check, version check, input and output check;

[0258] 1) Precision check

[0259] a Connect the current loop in series with the same polarity, and add an AC current of 5A. The display value error of the verification device should not be greater than ±1%.

[0260] b Connect the voltage loop in parallel with the same polarity, and add an AC voltage of 57.7V. The display value error of the verification device should not be greater than ±1%.

[0261] 2) Version check

[0262] Check whether the model of the device and each electrical quantity parameter are consistent with the order, and whether each accessory is complete, especially the rated value of the power supply voltage and the CT should match the site.

[0263] 3) Input and output check

[0264] S84, whole set test: bus differential protection whole set test, bus tie failure and dead zone protection whole set test, bus tie over-current whole set test, line protection whole set test.

[0265] Specifically, the step S9, the specific steps of controlling and installing and debugging the AC and DC system are,

[0266] S91, installation of the panel cabinet: according to the panel cabinet size and the design institute foundation drawing, make the frame foundation, transport the panel cabinet to the site and fix it, install the protection device and connect the wires;

[0267] According to the panel cabinet size and the design institute foundation drawing, select the position, cut the steel, make the frame foundation. Transport the panel cabinet to the site and fix it on the foundation with bolts or plates. Install the protection device in the panel cabinet and connect the wires.

[0268] S92, test and debugging of the protection device: measure the insulation resistance, perform the power frequency withstand voltage test, check the intermediate and time relays, and perform the power-on test of the protection device;

[0269] (1) Insulation resistance

[0270] Use a 1000V megohmmeter to measure the insulation resistance between the following loops and ground, and between the loops. The resistance value should be greater than 10MΩ.

[0271] 1) AC current loop + AC voltage loop → DC loop;

[0272] 2) AC current loop + AC voltage loop → output control loop;

[0273] 3) AC current loop + AC voltage loop → ground;

[0274] 4) AC current loop → AC voltage loop;

[0275] 5) DC loop → output control loop;

[0276] 6) DC loop → ground;

[0277] 7) Output control loop → ground.

[0278] (2) Power frequency withstand voltage test

[0279] Connect the protection loops together, perform a 1000V power frequency withstand voltage test for 1 minute, and measure the insulation resistance before and after the withstand voltage test. When the insulation resistance is greater than 1MΩ, use a 2500V megohmmeter instead of the power frequency withstand voltage test.

[0280] (3) Intermediate and time relay check

[0281] 1) Use an ohmmeter to measure the DC resistance of the coil, and the error between the measured value and the nominal value should be less than 10%.

[0282] 2) Measure the operating voltage and return voltage of the relay;

[0283] 3) Use a 1000V megohmmeter to measure the insulation resistance of the coil to ground;

[0284] 4) The time of protection action according to the setting time of the protection value;

[0285] (4) Protection device power-on test

[0286] Current, voltage loop drift measurement and AC sampling inspection;

[0287] Switching value input and output inspection;

[0288] Non-electricity action inspection;

[0289] Recorded protection-related characteristic curve and protection value inspection;

[0290] Characteristic test of various protection group action time;

[0291] Logic and function test of protection action.

[0292] S93, battery installation and charge-discharge: install the battery in the panel cabinet and connect, check the output voltage, select the charging method according to the battery terminal voltage, and operate and record the charge-discharge process step by step;

[0293] a) The battery of this project is installed in the panel cabinet. After the panel cabinet is installed and fixed, the battery is installed in the panel cabinet in turn, and the battery is connected with cable according to the factory drawing of the battery manufacturer. Pay attention to the connection of positive and negative poles in turn, then paste the positive and negative signs, and finally test the output voltage to ensure the reliable and correct connection of the battery.

[0294] b) Battery charge-discharge:

[0295] 1) Check that the DC system has been debugged and the power supply of the charging cabinet is ensured.

[0296] 2) After the battery is installed, check the terminal voltage of each battery on the DC panel microcomputer battery inspection instrument (the battery has been initially charged by the manufacturer before leaving the factory), and make a good record.

[0297] 3) The battery product out of the factory has passed the 10-hour rate capacity discharge check, and the user can not need to perform capacity check. If the user does not perform capacity check, the following requirements should be met:

[0298] If the terminal voltage of a single battery is ≥2.13V, it can be directly put into floating operation; if the terminal voltage of some batteries is <2.13V, the equalization charging should be performed in the current-limiting-constant-voltage mode, and then put into floating operation.

[0299] If the user has special requirements for capacity check, the following requirements should be met:

[0300] The first step is to measure the battery terminal voltage one by one, if the terminal voltage > 2.13V, then the cycle charging is carried out in the way of constant current-constant voltage to saturation; if the terminal voltage ≤ 2.13V, 20% capacity should be discharged before the cycle charging is carried out in the way of constant current-constant voltage to saturation.

[0301] The second step is to discharge the battery at 0.1C=0.1x1500=150A current to 1.80V, the discharge current and voltage are recorded every 1 hour, and the discharge capacity is calculated, the capacity > 95% rated capacity is qualified, that is, the discharge is more than 9.5 hours.

[0302] This discharge capacity is the standard at room temperature of 25℃. If the room temperature is other temperature, the following formula can be used for conversion comparison:

[0303] Ct=C25[1+K(t-25)] K is the temperature coefficient, K=0.008 at 10 hour rate discharge

[0304] The third step is to balance charge the discharged battery pack in the way of constant current-constant voltage to saturation, and then run in floating charge. The floating charge voltage is measured, and the balance is observed.

[0305] 4) Constant current-constant voltage charging operation steps:

[0306] The first step is constant current charging: I=(0.08-0.1)C=(0.08-0.1)x1500=(120-150)A, C-battery capacity, when the single voltage reaches 2.35±0.02V (this is the equalization charging voltage) [2.40±0.02V for cycle charging], it is converted to constant voltage charging.

[0307] The second step is constant voltage charging: the total voltage of the battery pack is constant at (2.35±0.02)xn=(2.35±0.02)x103=242±2V (this is the equalization charging voltage) [2.40±0.02)xn=(2.40±0.02)x103=247±2V for cycle charging], when the current decreases to (0.003-0.005)C=(0.003-0.005)x1500=4.5-7.5A and remains basically unchanged for 3-5 hours, it is converted to floating charge.

[0308] The third step is floating charge: the total voltage of the battery pack is constant at (2.24±0.01)xn=(2.24±0.01)x103=230±1V, which can be converted to floating operation for more than 32 hours.

[0309] S94, booster station grounding and lightning rod engineering: the 35kV system of the booster station adopts small resistance grounding mode.

[0310] The grounding grid of the booster station is mainly based on the horizontal voltage grid, and a part of vertical grounding electrodes are used to form a composite ring-shaped closed grounding grid. When the grounding resistance of the booster station does not meet the requirements, the number of grounding electrodes can be increased. The grounding electrodes are strictly in accordance with the specifications and materials of the design, and the corrosion resistance of the materials is ensured. The burial depth of the grounding electrodes is constructed according to the design depth.

[0311] The grounding grid of the booster station is integrated with the steel reinforcement of the building beam column and the lightning belt. The construction of the grounding device should be carried out in accordance with the "Electrical Device Installation Engineering Grounding Device Construction and Acceptance Specification" GB50169-2006. The grounding electrode is placed in the trench, and the top and horizontal grounding body are welded. The welding should meet the following requirements:

[0312] 1) Use horizontal grounding belt to connect all buried grounding electrodes. The grounding belt and the grounding electrode are connected by Ohm tube clamp welding. The horizontal belt is connected by lap welding, which requires 3-sided welding. The lap length should be 2 times the width of the flat steel.

[0313] 2) All welded joints buried in the ground should be evenly and reliably painted with anticorrosive paint. The part above the ground is painted with rust-proof paint and finish paint, and the grounding mark is made.

[0314] 3) The grounding flat steel in the station ensures reliable connection. The welding must be firm and reliable, and there should be no phenomenon of broken welding and unreliable welding. After the grounding flat steel is welded, the welding points are fully brushed with anticorrosive asphalt paint twice. When the equipment is connected with the grounding flat steel, bolt connection must be used.

[0315] After the grounding engineering construction is completed, the exposed grounding body should be painted with yellow and green alternating grounding marks according to the regulations.

[0316] 7.4.11.3 Grounding Resistance Test

[0317] The grounding resistance of the grounding grid is tested by using a grounding resistance tester. The grounding resistance value should meet the design requirements, and a test report should be issued.

[0318] 7.4.11.4 Lightning Rod Construction Scheme

[0319] a Foundation and anchor bolt retest

[0320] 1) Review whether the foundation axis, elevation, and anchor bolt specifications of the lightning rod meet the design requirements.

[0321] 2) The quality standards of the support surface on the top of the foundation and the position of the anchor bolt should meet:

[0322] ① The elevation deviation of the support surface: ≤±3.Omm;

[0323] ② The flatness deviation of the support surface: ≤5mm;

[0324] ③ The center offset of adjacent bolts: ≤2.Omm.

[0325] b assembly of components, arrangement of components

[0326] l) According to the drawing axis and the manufacturer's component installation instructions, make a "component plane arrangement diagram".

[0327] 2) The assembly site should be flat and solid when the components are transported, unloaded and discharged. According to the "component plane arrangement diagram", the components should be stacked as close as possible to reduce the secondary transportation in the yard.

[0328] 3) When arranging, the components should be leveled and straightened, and each section of steel column should be guaranteed not less than two supporting points.

[0329] c assembly of lightning rod

[0330] 1) When assembling, use a way to level and straighten it, and ensure that two way woods are leveled at both ends of each section of steel column. The way wood should be guaranteed on the same plane, and the zinc nodule or other attachments on the contact surface of the steel pipe should be checked and treated. After assembly, the length of the column body, the bending height of the column are measured.

[0331] 2) After the lifting point is determined, according to the material of the lightning rod and the material of the lifting rope used, in order to prevent the component zinc layer from being damaged during lifting, the lifting point should be protected, such as binding rubber or cloth pieces, and the jack rope should be made of rubber or nylon.

[0332] 3) When the lightning rod is completely lifted, insert the anchor bolt and temporarily tighten the bolt, and tighten the cable wind rope around it. After confirming that the cable wind rope is fixed and the column is basically vertical, the bolt is tightened, and then the large hook is loosened.

[0333] 4) After the lightning rod is in place, temporary grounding should be done immediately.

[0334] 5) When the independent lightning rod is less than 3m away from the entrance of the road or building, the equalization measures should be taken or the bare stone or asphalt ground should be laid.

[0335] d adjustment and correction of lightning rod

[0336] The plane correction should be adjusted at the root according to the foundation axis, and the three-dimensional correction should be detected on two mutually perpendicular planes by two theodolites at the same time. The correction is best done in the morning and evening to avoid the influence of sunlight.

[0337] After the lightning rod is installed, the following items are mainly checked:

[0338] 1) Grounding device and grounding resistance.

[0339] 2) Component corrosion prevention.

[0340] 3) Center line displacement ≤20.0mm.

[0341] 4) Elevation deviation from the benchmark: -10 to +5 mm.

[0342] 5) Verticality deviation: ≤H / 1000 (H refers to the column height), and not greater than 35mm.

[0343] 6) Lateral bending deviation: ≤H / 1000, and not greater than 20mm.

[0344] e-security measures:

[0345] 1) Personnel involved in the installation must undergo safety training, and untrained migrant workers must not be used.

[0346] 2) During the hoisting process, a designated person must be in charge of the operation, and all staff members must remain at their posts.

[0347] 3) All personnel entering the site must wear safety helmets correctly, and those working at heights must wear safety belts.

[0348] 4) The crane's support legs must be stable, fixed, and firm. Use sleepers or other means to prevent the support legs from falling directly onto loose soil, which could cause accidents such as slipping or tilting.

[0349] 5) At the hoisting operation site, it is strictly forbidden for anyone to stand within the swing range of the boom, and it is strictly forbidden to work under the hoisted components.

[0350] 6) Throwing objects from heights is strictly prohibited. Work on different levels should be staggered. Workers are strictly prohibited from standing on hoisted loads, crossing loaded wire ropes, or directly touching moving ropes or transmission systems.

[0351] Machinery and pulleys.

[0352] 7) On-site personnel must be familiar with communication signals. Command signals should be clear, conspicuous, and unambiguous. If a danger signal is detected, an emergency stop must be initiated.

[0353] 8) Before lifting, check that there are no construction tools, foreign objects, etc. on the components and passageways to avoid injuring people.

[0354] 9) The hoisting site should have conspicuous fences and safety warning signs.

[0355] 10) No more than two guy wires shall be fixed to the same temporary anchor. Each temporary guy wire shall be tightened or loosened by a designated person, and each stressed anchor shall be supervised by a designated person to ensure coordinated operation.

[0356] 11) When lifting, a trial lift should be performed first. When the lifting is 0.1 meters off the ground, the lifting should be stopped, and the balance and rope binding should be checked. Lifting can only continue after everything is normal.

[0357] 12) Strictly prohibited to carry out hoisting work in the possible thunderstorm weather and thunderstorm weather, and the lightning rod should be connected with the grounding net in time after hoisting.

[0358] 13) The assembly personnel shall not put fingers into the bolt hole.

[0359] 14) When using a large crowbar, two or more people shall not use one crowbar at the same time to prevent accidents.

[0360] In the GIS installation process, the main circuit insulation test needs to be carried out before the field withstand test, the partial discharge detection is carried out at 1.1 Um / √3, the AC withstand voltage value of the 72.5-363kV combined electric appliance should be 100% of the factory value, the AC withstand voltage value of the 550kV and above voltage level combined electric appliance should be not less than 90% of the factory value, the impulse withstand test is carried out when conditions permit, the lightning impulse test and the operating impulse test voltage value is 80% of the type test applied voltage value, each three times of positive and negative polarity, and should be carried out on the complete interval, the partial discharge test is carried out together with the withstand test; the auxiliary and control circuit insulation test adopts 2500V megohmmeter and the insulation resistance is greater than 10MΩ; the main circuit resistance test adopts the direct current pressure drop method with the current not less than 100A, the field test value should not exceed the control value Rn, and should not exceed 120% of the factory measured value compared with the factory value, the balance degree of the three-phase test value is paid attention to, and the test covers all electrical connections.

[0361] In the body inspection of the main transformer installation, when the un-hoisting cover inspection is adopted, the oxygen content in the oil tank must reach more than 18% before the worker enters the oil tank, the worker shall not carry the unrelated articles, and the carried tools and instruments are carefully counted to prevent missing in the oil tank.

[0362] In the circuit breaker installation of the outdoor power distribution device system installation, the time for checking the sealing condition by vacuum extraction should not be less than 2 hours, the filling pressure is 0.60Mpa (20℃), the filled gas must be tested qualified, the action value of each section of the density relay is checked during the filling process, the filling should be completed continuously at one time, and should not be interrupted. After the gas filling is completed, the flange connection pipeline and the pipeline joint are checked by the gas leak detector, and there should be no leakage. When measuring the micro water, the newly filled gas before installation needs to measure the micro water content, and the micro water content of the gas in the circuit breaker body is measured after the installation is completed and the gas is filled to the rated pressure and is placed for 24 hours.

[0363] In the isolation cabinet installation of the outdoor power distribution device system installation, the distance error between the disconnectors is less than 20mm, the inter-phase connecting rod is on the same horizontal line; the support insulator is perpendicular to the base plane, and the centers of the insulators of the same insulator column are in the same vertical plane; the connection between the support insulators is firm, the horizontal or vertical deviation can be corrected by the metal gasket during installation, the gasket is not more than 2 pieces, and the thickness is not more than 6mm.

[0364] In the busbar installation of the cable and busbar installed in the booster station, the conductor installation, the conductor cannot be directly dragged on the ground during the unwinding process, and the rubber or wood board needs to be laid on the ground, the compression sequence is that the tension clamp conductive aluminum pipe is sleeved into the conductor, the aluminum core of the conductor is cut off and the steel core is reserved, the steel anchor part is first compressed, and then the aluminum pipe is pulled to the compressed steel anchor for secondary compression, and the size of the hexagonal opposite side after compression should be 0.866D, and when any one opposite side size exceeds 0.866+0.2mm, the steel mold should be replaced.

[0365] In the battery charging and discharging in the control and AC / DC system installation and debugging, when the user has special requirements for capacity checking, the first step is to measure the battery terminal voltage one by one, if the terminal voltage is greater than 2.13V, the cycle charging is carried out in the current-limiting-constant-voltage mode to saturation, if the terminal voltage is less than or equal to 2.13V, 20% capacity should be discharged before the cycle charging is carried out in the current-limiting-constant-voltage mode to saturation; the second step is to discharge at 0.1C=0.1*1500=150A current to 1.80V, and the discharge current and voltage are recorded every 1 hour and the discharge capacity is calculated, the capacity greater than 95% rated capacity is qualified, that is, the discharge is more than 9.5 hours, and the discharge capacity is taken as the standard when the room temperature is 25 DEG C, if the room temperature is other temperature, the capacity can be converted according to the formula Ct=C25 [1+K (t-25)], K is the temperature coefficient, and K=0.008 when discharging at 10-hour rate; the third step is to carry out the equalizing charging of the battery pack discharged to saturation in the current-limiting-constant-voltage mode, and then the floating charging is carried out, the floating voltage is measured and the equalization is observed.

[0366] Improve installation precision and stability: the 110kV booster station electrical installation method proposed in the application uses advanced laser positioning technology and high-precision measuring instruments to accurately position the equipment installation position. In the transformer installation process, through the laser positioning system, the horizontal and vertical error of the transformer can be controlled within ±0.5mm, which is more than 50% higher than the traditional method. The special busbar connecting tool and process are adopted to ensure the close connection of the busbar, and the contact resistance can be reduced to less than 1 / 3 of the traditional connection mode, effectively reducing the power loss and local overheating risk, greatly improving the stability and reliability of the equipment operation.

[0367] Optimize wiring and post-maintenance: in the wiring design stage, professional electrical wiring software is used for simulation and optimization to realize the reasonable planning and orderly layout of the cable. Different voltage levels and functions of the cable are effectively isolated to reduce the generation of electromagnetic interference. At the same time, in the process of cable laying, the line slot and bridge with clear identification are adopted to provide great convenience for post-maintenance and fault troubleshooting. According to the actual case statistics, after adopting the new method, the cable fault troubleshooting time is shortened by more than 60%, which significantly improves the maintenance efficiency of the booster station.

[0368] Improve the efficiency and accuracy of debugging: Before debugging, use big data analysis and artificial intelligence technology to comprehensively and deeply analyze and learn the technical data of the equipment, so that the technical personnel can quickly and accurately master the key technical parameters and performance requirements of the equipment. In the debugging process, introduce automatic test equipment and intelligent data analysis system, realize real-time monitoring and accurate analysis of equipment operation parameters. Taking transformer test as an example, the automatic test equipment can complete a large amount of data collection and processing in a short time, and the data accuracy is improved by more than 95% compared with manual operation, while the debugging time is shortened by 30%-40%, greatly improving the efficiency and accuracy of debugging work.

[0369] Strengthen quality control and safety guarantee: A perfect quality control system is established, from equipment procurement, installation to debugging, strict quality detection standards and acceptance process are formulated for each link. Advanced non-destructive testing technology and online monitoring system are adopted to monitor and evaluate the installation quality of the equipment in real time, to ensure that every installation detail meets the specification requirements. In terms of safety management, intelligent safety protection equipment and early warning system such as leakage protection device, fire alarm system are equipped to provide all-round safety guarantee for the debugging personnel. Since the implementation of this method, no equipment failure caused by installation quality problems and no safety accidents caused by improper debugging operation have occurred in related projects.

[0370] Reduce the comprehensive cost: By improving the installation precision and debugging efficiency, the equipment failure and maintenance frequency are reduced, and the whole life cycle cost of the equipment is reduced. Optimize the wiring and reasonably plan the construction process to reduce material waste and labor cost. According to the actual engineering case analysis, compared with the traditional method, the electrical installation and debugging method of the present application can reduce the comprehensive cost of 110kV booster station by 10%-15%, which has significant economic benefits.

[0371] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A method for electrical installation and commissioning of a 110kV substation, characterized in that, Includes the following steps: S1, GIS installation at the booster station; S2, installation of high and low voltage control panels at the booster station; S3, Main transformer installation; S4, Installation of SVG reactive power compensation device in booster station; S5, Outdoor power distribution equipment system installation; S6, Installation of some cables and busbars within the substation; S7, Electrical equipment testing; S8, commissioning of individual electrical system units and the entire system; S9, control and AC / DC system installation and commissioning.

2. The electrical installation and commissioning method for a 110kV substation according to claim 1, characterized in that: The specific steps for installing the GIS at the booster station in step S1 are as follows: S11, In the early stage, the GIS foundation is checked and the lines are marked. The equipment is unpacked and inspected and the accessories are counted. The main bus BUS transport unit is the first equipment to be placed. According to the manufacturer's packing list and the designer's instructions, the BUS unit packaging box is unpacked and hoisted into the installation site for assembly. Then, other bays and bus expansion joints are installed. S12. After all parts are installed, install the voltage transformer and the incoming and outgoing bushings. During installation, ensure that the contact connection is reliable. First, install the inner shield and conductive rod, then put the outer equalizing ring on the bushing. Reliably treat the upper and lower sealing surfaces of the bushing as required. S13, perform accessory installation, including the installation of SF6 inflation pipes for each air chamber, air pipe installation for pneumatic operating mechanisms, grounding of the casing and secondary wiring, etc. S14 Before connecting each component, remove the protective cover of the basin insulator, and carefully wipe the surface of the basin insulator and the surface of the internal conductor with acetone using lint-free paper to ensure reliable contact of the sealing conductor and install the sealing ring. When installing the sealing ring, check the sealing surface and the surface of the sealing ring. If the sealing ring has problems such as deformation, cracking, or damage, replace it. S15. After each component of the GIS forms an independent closed gas chamber and the adsorbent is replaced, a vacuum is drawn. After maintaining the vacuum for 4 hours, a vacuum leak test is performed. If the vacuum level doubles after 4 hours, it is normal. Continue to draw a vacuum for 2 hours, then fill the gas chamber with SF6 gas to the rated pressure of 0.5Pa. Before filling, check that the filling equipment and pipelines are clean, free of moisture and oil, and that there are no leaks at the pipeline connections. The moisture content of the newly filled SF6 gas should be <8mg / g. S16, timely inspection of the product quality and installation quality of GIS complete sets of electrical appliances, including main circuit resistance measurement, air leakage detection, micro-water detection and main circuit AC withstand voltage test, etc.

3. The electrical installation and commissioning method for a 110kV substation according to claim 1, characterized in that: The specific steps for installing the high and low voltage control panels at the booster station in step S2 are as follows: S21, the foundation steel installation uses No. 8 channel steel. Find the highest point of the installation reference surface as the elevation of the foundation channel steel. The foundation channel steel must have a clear and reliable grounding. After correction, it is welded to the embedded parts. S22, the connection between the panel, cabinet and internal equipment and each component is firm, and it is fixed to the foundation channel steel by welding. When installed in rows, its verticality, horizontal deviation, as well as the deviation of the panel and cabinet surface and the allowable deviation between the panel and cabinet joints are within the specified range. S23, copper busbars are supplied in conjunction with switchgear, and are fixed with bolts and installed securely. The busbar lap surfaces are coated with electrical composite grease. S24, perform circuit breaker inspection and secondary circuit inspection.

4. The electrical installation and commissioning method for a 110kV substation according to claim 1, characterized in that: The specific steps for installing the main transformer in step S3 are as follows: S31. The main transformer body is unloaded and placed in place. After the equipment arrives at the site, a visual inspection is carried out in a timely manner, checking the appearance of the main body, the condition of the oil tank and accessories, checking the seals and gas pressure, and verifying the impact recorder. Before placement, the transformer foundation axis is checked and re-measured to ensure that the placement position and direction are correct. The transformer is then placed manually using a pushing device. S32, a simplified analysis of the insulating oil and manufacturer's replenishment oil in the transformer body is performed. The replenishment oil is pumped into a large oil tank using a vacuum oil filter and further filtered to meet the standards. S32, use a vacuum oil filter to drain the insulating oil inside the transformer body from the bottom drain valve into the large oil tank for inspection and oil filtration. S33. Transformer body inspection can be carried out by lifting the cover or directly entering the oil tank. When lifting the cover, use a 25t truck crane to lift slowly and steadily to prevent the transformer body from colliding with the oil tank wall. When inspecting without lifting the cover, check the oxygen content before entering the oil tank, do not bring any unrelated items, and take stock of the tools and equipment. When inspecting the transformer body, ensure that the ambient temperature and the temperature of the transformer body meet the requirements. Inspect bolts, iron core, insulation, tap changer, etc. After the inspection, rinse with qualified transformer oil and clean the bottom of the oil tank. S34, install accessories, including removing internal transport support components, connecting internal leads, and installing coolers, oil tanks, sleeves, non-excitation voltage regulator tap changers, gas relays, pressure relief valves, temperature measuring devices, control boxes, etc. Some accessories are installed after vacuum oil filling according to the manufacturer's instructions. S35. After the relevant installation work is completed, evacuate the inside of the transformer, isolate accessories that cannot withstand the mechanical strength of the vacuum, check the sealing, and after reaching the specified vacuum level and maintaining it for more than 8 hours, inject qualified transformer oil to the specified position, maintain it for more than 4 hours, and then release the vacuum. S36. Add oil to the transformer and vent the air from each vent plug until the oil tank is full of oil and the leakage test is passed. After venting the air again, adjust the oil level to normal and let it stand for more than 72 hours after the oil filling is completed. S37, before the transformer is put into operation, adjustments and tests shall be carried out in accordance with the regulations and manufacturer's instructions; S38, prepare and explain the installation operation instructions, and inspect the machinery and tools; control the insulating oil throughout the entire process, and strictly sample and test each link; inspect the transformer body or internal wiring connections on a windless, sunny day with relative humidity less than 75%, control the exposure time of the transformer body, and have personnel wear special work clothes; check the accessories that should be vacuumed before vacuuming, and isolate the accessories that should not be vacuumed; after vacuum oil filling, check the accessories, joints, and welds for oil leakage; strictly install and test the transformer according to the regulations and manufacturer's instructions and issue a test report.

5. The electrical installation and commissioning method for a 110kV substation according to claim 1, characterized in that: Step S4, the specific steps for installing the SVG reactive power compensation device at the booster station, are as follows: After receiving the device, first perform a visual inspection, then accept it according to the technical requirements of each component, and then install it according to the SVG frame assembly drawing. When adjusting the capacitor bank, ensure that the phase difference of the capacitors in each phase does not exceed 5%. Add copper-aluminum transition plates at the copper and aluminum contact conductive surfaces. Check the operating mode according to the capacitive reactance value of each phase capacitor of the SVG to ensure that it deviates from the high-order harmonic point.

6. The electrical installation and commissioning method for a 110kV substation according to claim 1, characterized in that: Step S5, the specific steps for installing the outdoor power distribution equipment system, are as follows: S51, Circuit breaker installation: Use a level to check the elevation and horizontality of the circuit breaker anchor bolt ends. Choose a sunny and windless day for installation. Under the guidance of the factory personnel, first install the steel structure support and adjust the horizontality and verticality. Tighten the anchor bolts, then hoist the pole and arc-extinguishing chamber and assemble them. Prevent foreign objects from falling in during assembly. Wipe the mating flange surface and put in the sealing ring. Tighten the bolts, connect the gas pipeline and check the cleanliness. Then, vacuum and check the seal. Fill with qualified gas. After filling, check the seal and trace moisture content. S52, Isolation Cabinet Installation: When unpacking, the owner, supervisor, and construction unit shall conduct a joint inspection and acceptance and record the findings. The inspection shall include components, accessories, spare parts, ceramic parts, etc. During installation, the phase-to-phase distance, insulator verticality, and connections of each component shall be controlled. The installation of the transmission device and operating mechanism shall meet the requirements. The contact condition and appearance of the conductive parts shall be checked. S6, Current Transformer Installation: S61, Capacitive Voltage Transformer Installation: Install the capacitors according to their corresponding numbers. Ensure that the connections are secure during assembly. Prevent tilting during hoisting. Measure the verticality after installation. Apply phase sequence paint. Connect the equalizing ring, terminals, and ground. S62, Current Transformer Installation: After being lifted horizontally to the outside of the container, it is lifted vertically and installed on the support frame. The verticality is adjusted, the transport support pads are removed and phase color markings are painted on them, and finally the ground is established. During installation, attention should be paid to the adjustment of the transformer ratio and the direction.

7. The electrical installation and commissioning method for a 110kV substation according to claim 1, characterized in that: The specific steps for installing some cables and busbars within the substation in step S6 are as follows: S61, Busbar Installation: First install the frame flexible conductors, then install the equipment connections. The conductor installation length is calculated by measuring the distance between the frame hanging points, the height difference, the length of the insulator string and hardware, and taking into account the conductor sag and tension. The length of the equipment connections and main busbar down conductors is measured according to the clamp position and a margin is reserved. The tension conductors are laid out, crimped and assembled. After crimping, the appearance is checked. After the double conductors are assembled, spacers are installed. The tension conductors can be hung by a truck crane with bulldozer traction or by manual winch traction. The installation of busbar down conductors and equipment connections must be carried out after the busbar is erected. Trial assembly is performed before crimping. S62, Cable Construction: Cable ducts shall be laid with consistent spacing and height and in a straight line. Before laying cables, technicians shall use computer-aided secondary design to recompile the laying list. Cables shall be laid in layers and bound in a uniform manner.

8. The electrical installation and commissioning method for a 110kV substation according to claim 1, characterized in that: The specific steps of the electrical equipment test in step S7 are as follows: S71, Transformer test: Measure the DC resistance of the winding and bushing, check the transformation ratio and connection group of all taps, measure the insulation resistance and absorption ratio of the winding and bushing, and perform the insulating oil test. S72, Current transformer test: Measure the insulation resistance of the winding and the insulation resistance of the end screen to ground, measure the dielectric loss tangent tgδ of the primary winding and bushing and the dielectric loss tangent tgδ of the end screen to ground, measure the excitation characteristic curve of the current transformer, and check the polarity and transformation ratio of the transformer leads. S73, Voltage Transformer Test: Measure the insulation resistance of the transformer, measure the DC resistance of the primary winding, check the polarity of the transformer leads, measure the no-load current and transformation ratio of the transformer, and measure the dielectric loss tangent tgδ of the primary winding and bushing. S74, Circuit Breaker Test: Conduct mechanical characteristic tests, measure the insulation resistance of the insulating tie rod, measure the resistance of each phase conductive circuit, measure the opening and closing time and synchronicity of the circuit breaker, measure the opening and closing speed of the circuit breaker, measure the insulation resistance and DC resistance of the opening and closing coils of the circuit breaker, conduct tests on the circuit breaker operating mechanism, measure the trace water content and sealing performance of the SF6 gas inside the circuit breaker, and calibrate the gas density relay, pressure gauge and pressure-operated valve.

9. The electrical installation and commissioning method for a 110kV substation according to claim 1, characterized in that: Step S8, the specific steps for debugging the electrical system unit and the system as described above, are as follows: S81, Main transformer protection commissioning: Perform AC analog quantity accuracy and phase checks, input quantity checks, main transformer differential protection commissioning, and secondary circuit checks. S82, Busbar Protection Debugging: Perform accuracy checks, input / output checks, and version checks; S83, Line Protection Verification: Performs accuracy checks, version checks, and input / output checks; S84, Complete Group Test: Conduct complete group tests of bus differential protection, bus tie failure and dead zone protection, bus tie overcurrent protection, and line protection.

10. The electrical installation and commissioning method for a 110kV substation according to claim 1, characterized in that: Step S9, the specific steps for the control and AC / DC system installation and commissioning, are as follows: S91, Panel installation: Construct a frame foundation according to the panel's external dimensions and the design institute's foundation drawings, transport the panel into place and fix it, and cooperate with the manufacturer to install protection devices and connect the wiring. S92, Protection device testing and commissioning: Measure insulation resistance, conduct power frequency withstand voltage test, verify intermediate and time relays, and conduct protection device energization test; S93, Battery Installation and Charging / Discharging: Install and connect the battery in the cabinet, check the output voltage, select the charging method according to the battery terminal voltage, and perform the charging and discharging process step by step and record it. S94, Substation Grounding and Lightning Rod Project: The 35kV system of the substation adopts a grounding method with low resistance.

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