Transformer cooler system defect simulation and practical training platform

Abstract

A transformer cooler system defect simulation and practical training platform is characterized in that an upper computer collects simulation fault signals and displays the fault signals to trainees through a display screen; the air cooling control cabinet and the fault simulation cabinet comprise a main power supply loop, a PLC, a control loop, an illumination and temperature and humidity control loop and a load, and are used for simulating faults and controlling a cooler switch. According to the utility model, the air-cooled control cabinet and the fault simulation cabinet generate set fault types to simulate defects and faults of the air-cooled control system, so that training personnel can learn fault and defect identification, and the air-cooled control system fault simulation device is of great significance in improving the skill level of working personnel, enhancing the fault removal capability and improving the equipment maintenance efficiency.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of defect simulation, more particularly, relate to a transformer cooler system defect simulation and practical training platform. BACKGROUND

[0002] With the rapid development of China's power system, higher requirements are put forward for the safe and reliable operation of transformer cooler system, and domestic power enterprises have an increasingly urgent demand for improving equipment maintenance skills, reducing accident risk and improving equipment reliability, which promotes the development of transformer cooler system defect simulation and practical training platform. At present, domestic power system simulation, virtual experiment and other fields have accumulated certain technical accumulation, which provides a technical basis for the development of transformer cooler system practical training platform.

[0003] For the current fault analysis and research of transformer cooling system, the faults caused by control device, cooler and the like are involved, including the following:

[0004] (1) Fault caused by control device

[0005] 1) The control of the control device is realized through various relays and other devices, and the line of the control device is complex and has many contacts, which results in low reliability, high failure rate and large maintenance amount of the control device.

[0006] 2) The relays often have faults such as coil burnout or contact burnout, and have poor reliability.

[0007] 3) The motor open-phase and overload protection of the device is completed by a thermal relay, and the protection function is unreliable, and the situation that the motor is burned due to motor overload and open-phase often occurs in operation.

[0008] (2) Fault caused by cooler

[0009] 1) The frequent start of auxiliary cooler caused by transformer load fluctuation causes the current relay for measuring the load of main transformer or the temperature relay for measuring the oil temperature of transformer to frequently act, which results in frequent start and stop of auxiliary cooler, shortens the service life of cooler electrical equipment, and at the same time, the frequent start and stop of cooler group also aggravates the charging phenomenon of transformer oil flow.

[0010] 2) The four fixed states of operation, auxiliary, standby and stop set by the cooler group cannot be adjusted online, and are not flexible.

[0011] 3) The cooler can be put into time and batch, and the starting current is too large, and the simultaneous sudden start of multiple submersible pumps will aggravate the charging phenomenon of transformer oil flow.

[0012] These faults pose a threat to normal operation and safety, and therefore it is necessary to research and establish a transformer cooler system defect simulation and practical training platform.

[0013] The patent with publication number CN117805689B discloses a transformer internal fault simulation experiment device, which records and detects the breakdown voltage of the transformer through the cooperation of the shell, the cooling fins, the voltage detector, the reciprocating screw rod, the limiting rod, the sliding block, the heating block, the transmission rod, and the belt pulley group. Meanwhile, the heating block can be moved in the transformer, thereby simulating the experiment of heat generation and fault occurrence at different positions inside the transformer.

[0014] The patent with publication number CN107422200A discloses a transformer internal fault simulation system, which comprises a shell, a support body, a discharge device, and a temperature adjusting device. The shell is used to charge the transformer oil to be tested. The support body is placed in the shell and is used to install the insulation paper to be tested. The discharge device is electrically connected with the power supply device and generates discharge to the transformer oil to be tested, thereby simulating the partial discharge fault and breakdown discharge fault of the transformer. The temperature adjusting device is used to adjust the temperature of the transformer oil, thereby simulating the local overheating fault of the transformer.

[0015] However, the above-mentioned patents only focus on the transformer internal fault simulation device and discuss different structures, lack of exploration of the transformer cooler system fault, especially do not involve the signal and control system, and lack of exploration of the defect fault simulation design from the perspective of signal and system. Utility model content

[0016] To solve the problems in the prior art, the utility model provides a transformer cooler system defect simulation and practical training platform, which is based on fault simulation signals and corresponding systems to establish a transformer cooler system fault simulation analysis system. On this basis, the development of corresponding platform devices is realized, the electrical and control faults of the transformer cooler system are comprehensively simulated, and corresponding teaching and practical training functions are designed to promote the visualization and materialization of professional teaching.

[0017] The utility model adopts the following technical solutions.

[0018] The utility model provides a transformer cooler system defect simulation and practical training platform in a first aspect, including host computer, air cooling control cabinet, fault simulation cabinet,

[0019] The host computer collects simulation fault signals and displays the fault signals to the trainees through the display screen.

[0020] The circuit installed in the air cooling control cabinet and the fault simulation cabinet includes a main power loop, a PLC, a control loop, a lighting and temperature and humidity control loop, and a load, which is used to simulate faults and control the switch of the cooler.

[0021] The input end of the main power circuit is connected with a three-phase power supply, the first output end outputs an external access three-phase access power supply, the second output end is connected with a controlled cooler, and the cooler has three groups. The first group of coolers is a commonly used working cooler, the second group of coolers is a standby cooler, and the third group of coolers is an auxiliary cooler. The main power circuit is used for supplying power to the load and the cooler.

[0022] The control circuit controls whether the main power circuit is connected with the cooler, and is used for controlling the cooler switch.

[0023] The load is connected with the external access three-phase access power supply of the main power circuit, and is used for simulating a fan and an oil pump of the cooler.

[0024] The PLC is used for realizing automatic remote control of the cooler state and sending a fault signal to an upper computer.

[0025] The lighting and temperature and humidity control circuit is used for lighting, simulation and collection of temperature and humidity.

[0026] The above circuits contain various contactors and are used for simulating faults.

[0027] The above circuits are installed in an air-cooled control cabinet and a fault simulation cabinet. The PLC and switches, circuit breakers and contactors in the circuit are installed in the air-cooled control cabinet, and the load is installed in the fault simulation cabinet.

[0028] Preferably, the air-cooled control cabinet and the fault control cabinet are both designed with double doors in front and back, the front door is internally designed with an operation panel, the cabinet structure is a base type, the cabinet body is installed through a bottom installation hole and a foundation, the top has a breathing hole, and the bottom has a cable inlet hole.

[0029] Preferably, the main power circuit of the air-cooled control cabinet and the fault control cabinet comprises first and second three-phase power supplies, first and second power supply inlet circuit breakers 1QF and 2QF, first and second phase sequence relays 1KM and 2KM, first, second and third contactor coil modules ZK1, ZK2 and ZK3, and first, second and third AC contactor contact modules KM1', KM2' and KM3'.

[0030] The first and second three-phase power supplies are connected with corresponding phases of the first and second phase sequence relays 1KM and 2KM through the first and second power supply inlet circuit breakers 1QF and 2QF, and are connected with an external access three-phase access power supply. The first and second power supply inlet circuit breakers 1QF and 2QF are used for controlling the corresponding first and second power supplies as input power supplies and are connected when closed. The first and second phase sequence relays 1KM and 2KM are used for separately controlling whether each phase of the power supply is connected with the external access three-phase access power supply and are connected when closed.

[0031] One end of the coil module ZK1, ZK2, ZK3 of the first, second, third contactor is connected to the external three-phase power supply, when current flows through, the contact module ZK1', ZK2', ZK3' of the first, second, third contactor of the control circuit of the air-cooled control cabinet is closed;

[0032] The other end of the coil module ZK1, ZK2, ZK3 of the first, second, third contactor is connected to the contact module KM1', KM2', KM3' of the first, second, third AC contactor, and then connected to the first, second, third group of coolers, to control whether the corresponding cooler works or not, and works when closed.

[0033] Preferably, the control circuit of the air-cooled control cabinet and the fault control cabinet includes a first circuit, a second circuit, a third circuit and a fourth circuit connected between any phase L line and neutral phase line N line of the first, second three-phase power supply of the main power supply circuit, specifically including a transformer three-side switch, a coil module K7 of a fire contactor, a contact module K7' of the fire contactor, a coil module KM1, KM2, KM3 of the first, second, third AC contactor, a first, second, third indicator light HL1, HL2, HL3, a contact module ZK1', ZK2', ZK3' of the first, second, third contactor, a contact module FR1', FR2', FR3' of the first, second, third control oil flow thermal contactor, a contact module FR11', FR21', FR31' of the first, second, third control fan thermal contactor, a first switch 1SA, a second switch 2SA, a third switch SA1, a fourth switch SA1, a fifth switch SA3, a first, second, third automatic control switch KA6, KA7, KA8;

[0034] The first circuit is: the transformer three-side switch, the first switch 1SA and the coil module K7 of the fire contactor are connected in series between any phase and the neutral phase line N line of the first, second three-phase power supply of the main power supply circuit; the transformer three-side switch normally works in a closed state; the first switch 1SA has two positions of “work” and “test”, when adjusted to the “work” position, this circuit is closed, and when in the “test” position, this circuit is disconnected;

[0035] The second loop, the third loop and the fourth loop circuit respectively contain the coil module KM1, KM2, KM3 of the first, second, third AC contactor, when current flows through, control the contact module KM1', KM2', KM3' of the first, second, third AC contactor of the main current loop to close, that is, when the second loop, the third loop and the fourth loop circuit are closed, the first, second and third group of coolers work, and stop working when they are disconnected; and the first, second, third indicator light HL1, HL2, HL3 are respectively connected in parallel with the coil module KM1, KM2, KM3 of the first, second, third AC contactor, when current flows through, the corresponding indicator light emits light, showing the working state of the corresponding cooler;

[0036] Preferably, the second loop, the third loop and the fourth loop circuit are specifically:

[0037] Any L line of the first, second three-phase power supply is connected with the contact module K7' of the fire contactor, when the coil module K7 of the fire contactor has current, the contact module K7' of the fire contactor is closed, simulating the occurrence of fire, controlling the three-side switch of the transformer to be disconnected, so that the contact module K7' of the fire contactor is disconnected, at this time, the second loop, the third loop and the fourth loop are disconnected, and the cooler stops working, the upper computer receives the fire signal and the cooler full-stop alarm signal;

[0038] The L line after the contact module K7' of the fire contactor is connected with the second switch 2SA, the second switch 2SA has "on-site" and "remote" two gears, when in the "remote" gear, the loop is disconnected, the PLC module is connected with the DC power supply suitable for PLC, in the control room, the contact module KM1', KM2', KM3' of the first, second, third AC contactor of the main current loop is directly controlled by controlling the PLC module to be opened and disconnected, realizing remote control of the cooler state; when in the "on-site" gear, the L line is connected with the third switch SA1, the fourth switch SA1 and the fifth switch SA3, the third switch SA1, the fourth switch SA1 and the fifth switch SA3 can be manually operated on-site beside the transformer to control the cooler switch;

[0039] The third switch SA1, the fourth switch SA1 and the fifth switch SA3 are the same in structure and have three gears of "manual", "stop" and "automatic". When the gear is "stop", all terminals of the switch are disconnected, the circuit where the switch is located is disconnected, and the corresponding cooler stops working. When the gear is "manual", the L line is connected to the N line through the contact module of the corresponding contactor, the contact module of the thermal contactor for controlling oil flow, the contact module of the thermal contactor for controlling the fan, and the module composed of the coil module and the indicator lamp of the corresponding AC contactor in parallel. The contact module of the corresponding contactor, the contact module of the thermal contactor for controlling oil flow and the contact module of the thermal contactor for controlling the fan are in a closed state in normal working, at this time, the switch is adjusted to the "manual" gear, and the corresponding cooler works. When the gear is "automatic", the PLC module is connected to the DC power supply suitable for PLC, the L line is connected to the N line through the corresponding automatic control switch, the contact module of the corresponding contactor, the contact module of the thermal contactor for controlling oil flow, the contact module of the thermal contactor for controlling the fan, and the module composed of the coil module and the indicator lamp of the corresponding AC contactor in parallel. The corresponding automatic control switch is controlled by the PLC to control whether the corresponding cooler works.

[0040] The first automatic control switch KA6, the contact module ZK1' of the first contactor, the contact module FR1 of the thermal contactor for controlling oil flow and the contact module FR11' of the thermal contactor for controlling the fan correspond to the third switch SA1. The second automatic control switch KA7, the contact module ZK2' of the second contactor, the contact module FR2 of the thermal contactor for controlling oil flow and the contact module FR21' of the thermal contactor for controlling the fan correspond to the fourth switch SA1. The third automatic control switch KA8, the contact module ZK3' of the third contactor, the contact module FR3 of the thermal contactor for controlling oil flow and the contact module FR31' of the thermal contactor for controlling the fan correspond to the fifth switch SA3.

[0041] Preferably, the PLC controls the opening and closing of the automatic control switch, and specifically:

[0042] The PLC collects the oil surface temperature and the winding temperature. When the oil surface temperature is 55℃ or the winding temperature is 85℃, the third automatic control switch KA8 is controlled to be opened, and the third group of coolers is controlled to stop working. When the oil surface temperature is 60℃ or the winding temperature is 90℃, the third automatic control switch KA8 is controlled to be closed, and the third group of coolers is controlled to start working. When the coolers are started, each cooler is started at an interval of 30 seconds. When the oil surface temperature is 75℃, the coolers are controlled to stop working, and the delay time is set to 30 minutes. When the oil surface temperature is less than 75℃, the delay time is set to 60 minutes. When a fault signal is received, the second automatic control switch KA7 is controlled to be closed, the second group of coolers is controlled to start working, and a fault alarm signal is sent.

[0043] Preferably, the lighting and temperature and humidity control circuit is connected between any phase L line and power N line of the first, second and third three-phase power supply of the main power supply circuit, for lighting the air-cooled control cabinet, while realizing temperature and humidity control and detection, and analog temperature and humidity signals, specifically: the L line is connected to one end of the lighting lamp EL through the door travel switch SQ; the two input ends of the temperature and humidity controller WSK are connected to the L line and the N line respectively, and the output end is connected to one end of the heater HR; the input end of the temperature controller WK is connected to the L line, and the output end is connected to one end of the cooling fan F; one end of the hole socket CZ is connected to the L line; the other end of the hole socket CZ, the other end of the lighting lamp EL, the other end of the heater HR and the other end of the cooling fan F are connected; the temperature and humidity controller WSK can measure temperature and humidity and adjust humidity, while controlling the heater HR to heat; the temperature controller WK can measure temperature, while controlling the cooling fan F to cool.

[0044] Preferably, the load includes first, second and third three-phase centrifugal small fans and first, second and third three-phase small fans, each phase of which is connected to the corresponding phase of the external three-phase power supply; the three-phase centrifugal small fans and the three-phase small fans are respectively used to simulate oil pumps and fans; the coil modules FR1, FR2 and FR3 of the first, second and third control oil flow thermal contactors are respectively connected between each phase of the first, second and third three-phase centrifugal small fans and the corresponding phase of the external three-phase power supply; the coils FR11, FR21 and FR31 of the coil modules of the first, second and third control fan thermal contactors are respectively connected between each phase of the first, second and third three-phase small fans and the corresponding phase of the external three-phase power supply.

[0045] The coil modules FR1, FR2 and FR3 of the first, second and third control oil flow thermal contactors control the closing of the contact modules FR1', FR2' and FR3' of the first, second and third control oil flow thermal contactors of the control circuit when current flows through them.

[0046] The coil modules FR11, FR21 and FR31 of the first, second and third control fan thermal contactors control the closing of the contact modules FR11', FR21' and FR31' of the first, second and third control fan thermal contactors of the control circuit when current flows through them.

[0047] Preferably, a fan dummy load is added to any phase of the three-phase small fan, and an oil pump dummy load is added to any phase of the three-phase centrifugal fan; the fan dummy load and the oil pump dummy load are connected between the external three-phase power supply and the coil modules of the thermal contactors, and are respectively used to simulate fan overload and oil pump overload.

[0048] The utility model discloses a beneficial effect lies in, compared with prior art, to the fault simulation signal and corresponding system as the foundation, establish transformer cooler system fault simulation and practical training platform, comprehensive simulation transformer cooler system's electrical, control failure, through the air -cooled control cabinet and fault simulation cabinet produce the failure type of setting, carry out to transformer air -cooled control system defect fault simulation to the cooler switch, design transformer cooler system defect simulation and practical training platform. The instructor can preset defect fault, through the air -cooled control system and load produce the specified state, then corresponding simulation signal transmission to host computer. The student can according to the simulation signal received by host computer, judge the failure type, realize not damaging the fault equipment, guarantee the premise of safety, complete the learning of training personnel to the fault defect identification, and have more image to the air -cooled control system. The practical training platform has important significance to the promotion staff skill level, enhancement fault removal ability, reduce the accident risk and improve equipment maintenance efficiency. Will help to guarantee the safe and stable operation of power system, improve the reliability and sustainability of energy supply. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 It is transformer cooler system defect simulation and practical training platform system schematic diagram

[0050] Figure 2 It is the front view of air -cooled control cabinet and fault simulation cabinet

[0051] Figure 3 It is the left view of air -cooled control cabinet and fault simulation cabinet

[0052] Figure 4 It is the base view of air -cooled control cabinet and fault simulation cabinet

[0053] Figure 5 It is main power circuit diagram

[0054] Figure 6 It is control circuit schematic diagram

[0055] Figure 7 It is load schematic diagram

[0056] Figure 8 It is illumination and humidity control circuit schematic diagram DETAILED DESCRIPTION

[0057] In order to make the utility model's purpose, technical scheme and advantage more clear, below will combine the drawings in the utility model embodiment, the technical scheme of the utility model is clearly and completely described. The embodiment described in the application is only a part of the embodiment of the utility model, not all embodiments. Based on the spirit of the utility model, all other embodiments obtained by those skilled in the art without making creative labor belong to the protection scope of the utility model.

[0058] As Figure 1 shown, the utility model embodiment 1 provides a kind of transformer cooler system defect simulation and practical training platform, including host computer, air cooling control cabinet, fault simulation cabinet,

[0059] Host computer acquires analog fault signal, and shows fault signal to trainee by display screen;

[0060] The circuit installed in air cooling control cabinet and fault simulation cabinet includes main power loop, PLC, control loop, lighting and temperature and humidity control loop and load, for simulating fault and controlling cooler switch,

[0061] Wherein, the input end of main power loop is connected with three-phase power supply, first output end exports external access three-phase access power supply, second output end is connected with the cooler of control, and the cooler has three groups, first group cooler is normal working cooler, second group cooler is spare cooler, and third group cooler is auxiliary cooler;Main power loop is used for power supply load cooler power supply;

[0062] Control circuit controls whether main power loop is connected with cooler, for controlling cooler switch;

[0063] Load is connected with the external access three-phase access power supply of main power loop, for simulating the fan and oil pump of cooler;

[0064] PLC is used to realize automatic remote control cooler state, and sends fault signal to host computer;

[0065] Lighting and temperature and humidity control loop are used for lighting and simulating and collecting temperature and humidity;

[0066] The above circuit contains various contactors, for simulating fault;

[0067] The above circuit is installed in air cooling control cabinet, fault simulation cabinet, wherein, PLC and switch, circuit breaker, contactor in the installation air cooling control cabinet, load is installed in fault simulation cabinet.

[0068] Preferably, as Figures 2-4 shown, the air cooling control cabinet and fault control cabinet are designed with double doors in front and back, the front door is designed with operation panel inside, the box structure is base type, and is installed through the base interface installation with foundation at the bottom of cabinet body, there is breathing hole at the top, and there is cable inlet hole at the bottom.

[0069] Preferably, the main power loop of air cooling control cabinet and fault control cabinet is as Figure 5As shown, the first, second three-phase power supply, the first, second power supply incoming line circuit breaker 1QF, 2QF, the first, second phase sequence relay 1KM, 2KM, the first, second, third contactor coil module ZK1, ZK2, ZK3, the first, second, third AC contactor contact module KM1', KM2', KM3';

[0070] The first, second three-phase power supply is connected to the corresponding phase of the first, second phase sequence relay 1KM, 2KM through the first, second power supply incoming line circuit breaker 1QF, 2QF, and is connected to the external three-phase access power supply; the first, second power supply incoming line circuit breaker 1QF, 2QF is used to control the corresponding first, second power supply as an input power supply, and is closed when connected; the first, second phase sequence relay 1KM, 2KM is used to individually control whether each phase of the power supply is connected to the external three-phase access power supply, and is closed when connected;

[0071] One end of the coil module ZK1, ZK2, ZK3 of the first, second, third contactor is connected to the external three-phase access power supply, and when current flows through, the contact module ZK1', ZK2', ZK3' of the first, second, third contactor of the control loop of the air-cooled control cabinet is closed;

[0072] The other end of the coil module ZK1, ZK2, ZK3 of the first, second, third contactor is connected to the contact module KM1', KM2', KM3' of the first, second, third AC contactor, and then connected to the first, second, third group of coolers, to control whether the corresponding cooler works, and works when closed.

[0073] Preferably, the control loop of the air-cooled control cabinet and the fault control cabinet is as shown Figure 6 As shown, the first, second three-phase power supply, the first, second power supply incoming line circuit breaker 1QF, 2QF, the first, second phase sequence relay 1KM, 2KM, the first, second, third contactor coil module ZK1, ZK2, ZK3, the first, second, third AC contactor contact module KM1', KM2', KM3';

[0074] The first circuit is that the coil module K7 of the transformer three-side switch, the first switch 1SA and the fire contactor are connected in series between any phase of the first and second three-phase power supply and the neutral line N of the main power supply circuit; the transformer three-side switch is normally closed; the first switch 1SA has two positions of "work" and "test", and the circuit is closed when the first switch 1SA is adjusted to the "work" position, and the circuit is disconnected when the first switch 1SA is adjusted to the "test" position.

[0075] The second circuit, the third circuit and the fourth circuit respectively include the coil modules KM1, KM2 and KM3 of the first, second and third AC contactors, and when current flows through the coil modules KM1, KM2 and KM3, the contact modules KM1', KM2' and KM3' of the first, second and third AC contactors of the main current circuit are controlled to be closed, that is, when the second circuit, the third circuit and the fourth circuit are closed, the first, second and third groups of coolers work, and stop working when the second circuit, the third circuit and the fourth circuit are disconnected; and the first, second and third indicator lights HL1, HL2 and HL3 are connected in parallel with the coil modules KM1, KM2 and KM3 of the first, second and third AC contactors respectively, and when current flows through the coil modules KM1, KM2 and KM3, the corresponding indicator light emits light to display the working state of the corresponding cooler.

[0076] Preferably, the second circuit, the third circuit and the fourth circuit are specifically as follows:

[0077] Any L line of the first and second three-phase power supply is connected with the contact module K7' of the fire contactor, and when the coil module K7 of the fire contactor has current, the contact module K7' of the fire contactor is closed, simulating the occurrence of fire, controlling the transformer three-side switch to be disconnected, so that the contact module K7' of the fire contactor is disconnected, at this time, the second circuit, the third circuit and the fourth circuit are disconnected, and the coolers stop working, and the upper computer receives the fire signal and the cooler full-stop alarm signal.

[0078] The L line after the contact module K7' of the fire contactor is connected with the second switch 2SA, and the second switch 2SA has two positions of "local" and "remote", and when the second switch 2SA is in the "remote" position, the circuit is disconnected, the PLC module is connected with a direct current power supply suitable for PLC, and the contact modules KM1', KM2' and KM3' of the first, second and third AC contactors of the main current circuit are directly controlled in the control room to be opened and disconnected, so that the cooler state is remotely controlled; when the second switch 2SA is in the "local" position, the L line is connected with the third switch SA1, the fourth switch SA1 and the fifth switch SA3, and the third switch SA1, the fourth switch SA1 and the fifth switch SA3 can be manually operated at the transformer to control the cooler switch.

[0079] The third switch SA1, the fourth switch SA1 and the fifth switch SA3 are the same in structure and have three gears of "manual", "stop" and "automatic". When the gear is "stop", all terminals of the switch are disconnected, the circuit where the switch is located is disconnected, and the corresponding cooler stops working. When the gear is "manual", the L line is connected to the N line through the contact module of the corresponding contactor, the contact module of the thermal contactor for controlling oil flow, the contact module of the thermal contactor for controlling the fan, and the module composed of the coil module and the indicator lamp of the corresponding AC contactor in parallel. The contact module of the corresponding contactor, the contact module of the thermal contactor for controlling oil flow and the contact module of the thermal contactor for controlling the fan are in a closed state in normal working, at this time, the switch is adjusted to the "manual" gear, and the corresponding cooler works. When the gear is "automatic", the PLC module is connected to the DC power supply suitable for PLC, the L line is connected to the N line through the corresponding automatic control switch, the contact module of the corresponding contactor, the contact module of the thermal contactor for controlling oil flow, the contact module of the thermal contactor for controlling the fan, and the module composed of the coil module and the indicator lamp of the corresponding AC contactor in parallel. The corresponding automatic control switch is controlled by the PLC to control whether the corresponding cooler works.

[0080] The first automatic control switch KA6, the contact module ZK1' of the first contactor, the contact module FR1 of the thermal contactor for controlling oil flow and the contact module FR11' of the thermal contactor for controlling the fan correspond to the third switch SA1; the second automatic control switch KA7, the contact module ZK2' of the second contactor, the contact module FR2 of the thermal contactor for controlling oil flow and the contact module FR21' of the thermal contactor for controlling the fan correspond to the fourth switch SA1; and the third automatic control switch KA8, the contact module ZK3' of the third contactor, the contact module FR3 of the thermal contactor for controlling oil flow and the contact module FR31' of the thermal contactor for controlling the fan correspond to the fifth switch SA3.

[0081] Preferably, the PLC controls the opening and closing of the automatic control switch, and specifically:

[0082] The PLC collects the oil surface temperature and the winding temperature. When the oil surface temperature is 55℃ or the winding temperature is 85℃, the third automatic control switch KA8 is controlled to be opened, and the third group of coolers is controlled to stop working. When the oil surface temperature is 60℃ or the winding temperature is 90℃, the third automatic control switch KA8 is controlled to be closed, and the third group of coolers is controlled to start working. When the coolers are started, each cooler is started at an interval of 30 seconds. When the oil surface temperature is 75℃, the coolers are controlled to stop working, and the delay time is set to 30 minutes. When the oil surface temperature is less than 75℃, the delay time is set to 60 minutes. When a fault signal is received, the second automatic control switch KA7 is controlled to be closed, the second group of coolers is controlled to start working, and a fault alarm signal is sent.

[0083] Preferably, the lighting and temperature and humidity control circuit is as shown in Figure 8 Preferably, the lighting and temperature and humidity control circuit is as shown in

[0084] Preferably, the load is as shown in Figure 7 Preferably, the load is as shown in

[0085] The coil modules FR1, FR2, FR3 of the first, second, and third control oil flow thermal contactors control the contact modules FR1', FR2', FR3' of the first, second, and third control oil flow thermal contactors to close when current flows through the coil modules FR1, FR2, FR3.

[0086] The coil modules FR11, FR21, FR31 of the first, second, and third control fan thermal contactors control the contact modules FR11', FR21', FR31' of the first, second, and third control fan thermal contactors to close when current flows through the coil modules FR11, FR21, FR31.

[0087] Preferably, a fan dummy load is added to any one of the three phases of each three-phase fan, and an oil pump dummy load is added to any one of the three phases of the three-phase centrifugal fan. The fan dummy load and the oil pump dummy load are connected between the external three-phase input power and the coil modules of the thermal contactors, and are used to simulate fan overload and oil pump overload, respectively.

[0088] The following Table 1 illustrates the hardware of the present embodiment and corresponding simulation devices or states.

[0089] Table 1 Hardware and corresponding simulation devices or states

[0090] Serial number Hardware material Simulated device or condition 1 Three-phase small fan Simulated fan 2 Three-phase centrifugal small fan Simulated oil pump 3 Fan dummy load Simulated fan overload 4 Oil pump dummy load Simulated oil pump overload 5 Temperature controller WK Simulated transformer temperature meter 6 First, second, third contactor Simulated power failure

[0091] The signals that can be simulated and monitored by the transformer and the control cabinet of the present utility model are shown in Table 2. Among them, the fan fault, the oil pump fault, etc. can be realized respectively for each cooler. Table 2 gives the equipment and the monitoring signal, which can correspond to the related fault type. Among them, the state signal of the transformer of serial number 1 is divided into the operation signal, the load and temperature signal, and the fire signal. The operation signal reflects the equipment operation and power supply; the fire signal is a set signal, when the fire signal is received, the control system is pushed to run; when the overheating and overload faults occur, the load and temperature signal is sent to the control system and the upper computer, the adjustment action is executed and the data is recorded, and the fan and oil pump load condition is observed and recorded, and the temperature controller data is collected. The load and temperature correlation parameters can be set in the PLC, and the temperature and load level are defined. In the signal of the control cabinet of serial number 2, when the fan and oil pump faults occur, that is, the faults caused by the cooler are usually found, the cooler problem is checked; when the cooler is shut down, first of all, whether the power failure is observed, then according to the different combination of signals, the specific fault type and specific positioning can be judged through the fault signal classification.

[0092] Table 2 Equipment and monitoring signal

[0093]

[0094]

[0095] The input and output signals of the control cabinet are shown in Table 3. Among them, the fire signal, the three-side switch signal and the remote start-stop signal are preset signals, which need to be determined before fault simulation analysis, and then the fault type is matched according to the signal state. The input and output of the control cabinet reflect the main signal flow relationship between the air-cooled control cabinet and the fault simulation cabinet in the present utility model. The input signal of the control cabinet indicates that the signal flows from the fault simulation cabinet to the air-cooled control cabinet, and the output indicates that the signal flows from the air-cooled control cabinet to the fault simulation cabinet.

[0096] Table 3 Control cabinet signal

[0097]

[0098] The utility model discloses beneficial effect lies in, compared with prior art, to the fault simulation signal and corresponding system as the foundation, establish transformer cooler system fault simulation and practical training platform, comprehensive simulation transformer cooler system's electrical, control failure, produce the fault type of setting through air -cooled control cabinet and fault simulation cabinet, carry out simulation to transformer air -cooled control system defect fault, and control cooler switch, design transformer cooler system defect simulation and practical training platform. The instructor can preset defect fault, through air -cooled control system and load produce specified state, then corresponding simulation signal transmission to host computer. The student can determine fault type according to the simulation signal received by host computer, realize not damaging the fault equipment, guarantee the premise of safety, complete the learning of training personnel to the fault defect identification, and have more image to air -cooled control system. The practical training platform has important significance to promote staff skill level, enhance the troubleshooting ability, reduce the accident risk and improve equipment maintenance efficiency. Will help to guarantee the safe and stable operation of power system, improve the reliability and sustainability of energy supply.

[0099] Finally, it should be noted that the above examples are used to illustrate the technical solutions of the present application, but not to limit it. Although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that the specific embodiments of the present application can be modified or replaced, without departing from the spirit and scope of the present application. Any modification or equivalent replacement that does not depart from the spirit and scope of the present application should be covered by the protection scope of the claims of the present application.

Claims

1. A transformer cooler system defect simulation and practical training platform, comprising an upper computer, an air-cooled control cabinet and a fault simulation cabinet, characterized in that: the upper computer collects simulated fault signals and displays the fault signals to the trainees through a display screen; the circuits installed in the air-cooled control cabinet and the fault simulation cabinet include a main power circuit, a PLC, a control circuit, a lighting and temperature and humidity control circuit and a load, which are used to simulate faults and control the cooler switch; the input end of the main power circuit is connected with a three-phase power supply, the first output end outputs an external three-phase access power supply, the second output end is connected with the controlled cooler, the cooler has three groups, the first group of cooler is a commonly used working cooler, the second group of cooler is a standby cooler, and the third group of cooler is an auxiliary cooler; the main power circuit is used to supply power to the load and the cooler; the control circuit controls whether the main power circuit is connected with the cooler, and is used to control the cooler switch; the load is connected with the external three-phase access power supply of the main power circuit, and is used to simulate the fan and the oil pump of the cooler; the PLC is used to realize automatic remote control of the cooler state and send fault signals to the upper computer; and the lighting and temperature and humidity control circuit is used for lighting and simulating and collecting temperature and humidity. 2.The transformer cooler system defect simulation and practical training platform according to claim 1, characterized in that: the air-cooled control cabinet and the fault control cabinet are both designed with front and rear double doors, the front door is internally designed with an operation panel, the cabinet structure is a base type, the cabinet is installed through the bottom mounting hole and the foundation, the top has a breathing hole, and the bottom has a cable inlet hole. 3.The transformer cooler system defect simulation and practical training platform according to claim 1, characterized in that: the main power circuit of the air-cooled control cabinet and the fault control cabinet comprises a first three-phase power supply, a second three-phase power supply, a first power supply inlet circuit breaker 1QF, a second power supply inlet circuit breaker 2QF, a first phase sequence relay 1KM, a second phase sequence relay 2KM, a first contactor coil module ZK1, a second contactor coil module ZK2, a third contactor coil module ZK3, a first AC contactor contact module KM1', a second AC contactor contact module KM2' and a third AC contactor contact module KM3'; the first three-phase power supply and the second three-phase power supply are respectively connected with the corresponding phase of the first phase sequence relay 1KM and the second phase sequence relay 2KM through the first power supply inlet circuit breaker 1QF and the second power supply inlet circuit breaker 2QF, and are connected with an external three-phase access power supply; the first power supply inlet circuit breaker 1QF and the second power supply inlet circuit breaker 2QF are used to control the corresponding first power supply and the second power supply as input power supplies, and are closed when connected; the first phase sequence relay 1KM and the second phase sequence relay 2KM are used to separately control whether each phase of the power supply is connected with the external three-phase access power supply, and are connected when closed; one end of the first contactor coil module ZK1, the second contactor coil module ZK2 and the third contactor coil module ZK3 are connected with the external three-phase access power supply, and when current flows through, the first contactor contact module ZK1', the second contactor contact module ZK2' and the third contactor contact module ZK3' of the control circuit of the air-cooled control cabinet are closed. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The other end of the coil module ZK1, ZK2, ZK3 of the first, second, third contactor is connected with the contact module KM1', KM2', KM3' of the first, second, third AC contactor respectively and then connected to the first, second, third group of coolers to control whether the corresponding cooler works or not, and works when closed.

4. The transformer cooler system defect simulation and practical training platform of claim 3, characterized in that: The control circuit of the air cooling control cabinet and the fault control cabinet comprises a first circuit, a second circuit, a third circuit and a fourth circuit connected between any phase L line and neutral phase N line of the first, second and third three-phase power supply of the main power supply circuit, and specifically comprises transformer three-side switches, a coil module K7 of a fire contactor, a contact module K7' of the fire contactor, coil modules KM1, KM2, KM3 of the first, second and third AC contactors, first, second and third indicator lights HL1, HL2, HL3, contact modules ZK1', ZK2', ZK3' of the first, second and third contactors, contact modules FR1', FR2', FR3' of the first, second and third control oil flow thermal contactors, contact modules FR11', FR21', FR31' of the first, second and third control fan thermal contactors, first, second and third automatic control switches KA6, KA7, KA8; The first circuit is that the transformer three-side switches, the first switch 1SA and the coil module K7 of the fire contactor are connected in series between any phase and the neutral phase N line of the first, second and third three-phase power supply of the main power supply circuit; the transformer three-side switches normally work in a closed state; the first switch 1SA has two positions of "work" and "test", and the circuit is closed when adjusted to the "work" position, and is disconnected when in the "test" position; The second circuit, the third circuit and the fourth circuit respectively comprise coil modules KM1, KM2, KM3 of the first, second and third AC contactors, and when current flows through the coil modules KM1, KM2, KM3, the contact modules KM1', KM2', KM3' of the first, second and third AC contactors of the main current circuit are closed, that is, when the second circuit, the third circuit and the fourth circuit are closed, the first, second and third groups of coolers work, and stop working when disconnected; and the first, second and third indicator lights HL1, HL2, HL3 are connected in parallel with the coil modules KM1, KM2, KM3 of the first, second and third AC contactors respectively, and when current flows through the coil modules KM1, KM2, KM3, the corresponding indicator light emits light to show the working state of the corresponding cooler.

5. The transformer cooler system defect simulation and practical training platform of claim 4, characterized in that: The second circuit, the third circuit and the fourth circuit are specifically Any L line of the first, second and third three-phase power source is connected with the contact module K7' of the fire contactor, when the coil module K7 of the fire contactor has current, the contact module K7' of the fire contactor is closed, when the fire occurs, the transformer three-side switch is opened, the contact module K7' of the fire contactor is opened, at this time, the second loop, the third loop and the fourth loop are all disconnected, the cooler stops working, the upper computer receives the fire signal and the cooler full-stop alarm signal; The L line after the contact module K7' of the fire contactor is connected with the second switch 2SA, the second switch 2SA has "on-site" and "remote" two positions, when the "remote" position, the loop is disconnected, the PLC module is connected with the direct current power supply suitable for PLC, in the control room, the contact modules KM1', KM2' and KM3' of the first, second and third AC contactors in the main current loop are directly controlled by controlling the PLC module, the remote control of the cooler state is realized; when the "on-site" position, the L line is connected with the third switch SA1, the fourth switch SA1 and the fifth switch SA3, the third switch SA1, the fourth switch SA1 and the fifth switch SA3 can be manually operated on-site beside the transformer to control the cooler switch; The third switch SA1, the fourth switch SA1 and the fifth switch SA3 are the same structure, have "manual", "stop" and "automatic" three positions, when the "stop" position, all the end points are disconnected, the loop is disconnected, the corresponding cooler stops working; when the "manual" position, the L line is connected to the N line through the contact module of the corresponding contactor, the contact module of the corresponding control oil flow thermal contactor, the contact module of the corresponding control fan thermal contactor, and the module composed of the coil module and the indicator lamp of the corresponding AC contactor in parallel, the contact module of the corresponding contactor, the contact module of the corresponding control oil flow thermal contactor and the contact module of the corresponding control fan thermal contactor are in closed state when working normally, at this time, the switch is adjusted to the "manual" position, the corresponding cooler works; when the "automatic" position, the L line is connected to the N line through the contact module of the corresponding contactor, the contact module of the corresponding control oil flow thermal contactor, the contact module of the corresponding control fan thermal contactor, and the module composed of the coil module and the indicator lamp of the corresponding AC contactor in parallel, the corresponding automatic control switch is controlled by the PLC, whether the corresponding cooler works is controlled; The components corresponding to the third switch SA1 are: the first automatic control switch KA6, the contact module ZK1′ of the first contactor, the contact module FR1 of the first thermal contactor controlling oil flow, and the contact module FR11′ of the first thermal contactor controlling the fan; the components corresponding to the fourth switch SA1 are: the second automatic control switch KA7, the contact module ZK2′ of the second contactor, the contact module FR2 of the second thermal contactor controlling oil flow, and the contact module FR21′ of the second thermal contactor controlling the fan; and the components corresponding to the fifth switch SA3 are: the third automatic control switch KA8, the contact module ZK3′ of the third contactor, the contact module FR3 of the third thermal contactor controlling oil flow, and the contact module FR31′ of the third thermal contactor controlling the fan.

6. The transformer cooler system defect simulation and training platform according to claim 5, characterized in that: The PLC controls the automatic switching on and off, specifically: The PLC collects the oil surface temperature and winding temperature. When the oil surface temperature is 55℃ or the winding temperature is 85℃, it controls the opening of the third automatic control switch KA8 to shut down the third group of coolers. When the oil surface temperature is 60℃ or the winding temperature is 90℃, it controls the closing of the third automatic control switch KA8 to start the third group of coolers. Each cooler starts at a 30-second interval. When the oil surface temperature exceeds 75℃, the coolers will all stop and trip after a delay of 30 minutes. If the cooler temperature is below 75℃ when it stops, the trip will be delayed for 60 minutes. When a fault signal is received, the second automatic control switch KA7 is closed to start the second group of coolers and issue a fault alarm signal.

7. The transformer cooler system defect simulation and training platform according to claim 1, characterized in that: The lighting and temperature / humidity control circuit is connected between the L line and N line of any one of the first, second, or third phases of the main power supply circuit. It is used for the lighting air-cooled control cabinet and simultaneously controls and detects temperature and humidity, simulating temperature and humidity signals. Specifically: the L line is connected to one end of the lighting lamp EL via a gate-controlled limit switch SQ; the two input terminals of the temperature / humidity controller WSK are connected to the L line and N line respectively, and its output terminal is connected to one end of the heater HR; the input terminal of the temperature controller WK is connected to the L line, and its output terminal is connected to one end of the cooling fan F, with one end of the socket CZ connected to the L line; the other end of the socket CZ, the other end of the lighting lamp EL, and the other end of the heater HR are connected to the other end of the cooling fan F. The temperature / humidity controller WSK can measure temperature and humidity and adjust humidity, while simultaneously controlling the heating temperature HR of the heater. The temperature controller WK can measure temperature and simultaneously control the cooling fan F to cool down.

8. The transformer cooler system defect simulation and training platform according to claim 5, characterized in that: The load includes first, second, third three-phase centrifugal fan and first, second, third three-phase fan, each phase is connected with the corresponding phase of the external three-phase power supply, the three-phase centrifugal fan and the three-phase fan are used to simulate the oil pump and the fan respectively; the coil module FR1, FR2, FR3 of the first, second, third control oil flow thermal contactor is respectively connected between each phase of the first, second, third three-phase centrifugal fan and the corresponding phase of the external three-phase power supply; the coil FR11, FR21, FR31 of the coil module of the first, second, third control fan thermal contactor is respectively connected between each phase of the first, second, third three-phase fan and the corresponding phase of the external three-phase power supply; The coil module FR1, FR2, FR3 of the first, second, third control oil flow thermal contactor controls the contact module FR1', FR2', FR3' of the first, second, third control oil flow thermal contactor of the control circuit to be closed when current flows through; The coil module FR11, FR21, FR31 of the first, second, third control fan thermal contactor controls the contact module FR11', FR21', FR31' of the first, second, third control fan thermal contactor of the control circuit to be closed when current flows through.

9. The transformer cooler system defect simulation and practical training platform of claim 8, wherein: A fan dummy load is added to any one phase of the three-phase fan on each three-phase fan, and an oil pump dummy load is added to any one phase of the three-phase centrifugal fan, the fan dummy load and the oil pump dummy load are connected between the external three-phase power supply and the coil module of the thermal contactor, and are used to simulate fan overload and oil pump overload respectively.

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