A power supply and distribution system for a high-voltage power transformer field testing vehicle

Abstract

The present invention discloses a power supply and distribution system for a high-voltage power transformer on-site detection vehicle. The on-board mobile power supply (hereinafter referred to as "on-board power supply") is connected in parallel with the 12V DC power consumption part and the 220V AC power consumption part through the No. 1 isolating switch, the inverter power supply, and the switching power supply, and is connected in parallel with the 12V DC power consumption part through the No. 2 isolating switch; the external power supply (hereinafter referred to as "mains power") is connected in parallel with the 12V DC power consumption part, the 220V AC power consumption part, and the on-board power supply through the isolation transformer, the No. 1 isolating switch, the inverter power supply, and the switching power supply, and is connected in parallel with the 220V AC power consumption part through the No. 2 isolating switch, and is connected in parallel with the ceiling air conditioner; the automobile generator is connected in parallel with the on-board power supply through the dual battery isolation controller, and is connected in parallel with the 12V DC power consumption part through the No. 2 isolating switch. The present invention has the advantages of flexible operation, wide application, and complementary advantages.

Description

Technical Field

[0001] The invention relates to the field of power transmission and distribution, and in particular to a power supply and distribution system for a high-voltage power transformer on-site detection vehicle. Background Art

[0002] High-voltage power transformers (including current transformers and voltage transformers) are measuring devices that convert large currents and high voltages in the circuit into small currents and low voltages in proportion. This conversion facilitates parameter measurement and is widely used in various substations. High-voltage power transformers of 110kV and above voltage levels have large dimensions and are made as a set for fixed installation, so they can only be tested on site. At present, the common method is to use a truck to pull the detection equipment to the site, and then unload the truck and set up the equipment and wire it for testing; this method is inefficient, and repeated loading and unloading, repeated wiring and disconnection are prone to errors, and the equipment is easily damaged by the on-site construction environment. In order to improve the detection efficiency, a few equipment manufacturers have integrated the detection equipment, control equipment and other auxiliary equipment on a special vehicle to make a special detection vehicle for high-voltage power transformers (hereinafter referred to as "transformer detection vehicle").

[0003] Since the transformer test vehicle is highly specialized and targeted, there are no mature and complete cases for reference in the existing special test vehicles, and they are generally specially customized according to needs. In the whole vehicle design process, the power supply and distribution system is the basis for the transformer test vehicle to realize equipment control and monitoring, and it is the central system of the entire transformer test vehicle. Without a complete power supply and distribution system, the design of the transformer test vehicle is out of the question. The existing transformer test vehicle has a simple configuration, no complete power supply and distribution system, imperfect control and monitoring functions, and a low degree of integration. In order to improve the specialization and integration of the transformer test vehicle, improve the convenience of detection and use, and simplify the operating procedures of the test personnel, it is necessary to study a mature and complete transformer test vehicle power supply and distribution system. Summary of the invention

[0004] The present invention aims to provide a power supply and distribution system for a high-voltage power transformer on-site detection vehicle with complementary advantages and flexible control.

[0005] To achieve the above purpose, the following technical scheme is adopted: the system described in the present invention includes a vehicle-mounted mobile power supply, a No. 1 isolating switch, a No. 2 isolating switch, a car generator, a car battery, a dual-battery isolation controller, an inverter power supply, a 12V DC power consumption part, a 220V AC power consumption part, and an isolation transformer.

[0006] The vehicle-mounted power supply is connected in parallel with the 12V DC power consumption part and the 220V AC power consumption part through the No. 1 isolating switch, the inverter power supply, and the switching power supply, and is connected in parallel with the 12V DC power consumption part through the No. 2 isolating switch.

[0007] The city electricity is connected in parallel with the 12V DC power consumption part, the 220V AC power consumption part, and the vehicle power supply through the isolation transformer, the No. 1 isolation switch, the inverter power supply, the switching power supply, and the 220V AC power consumption part through the No. 2 isolation switch, and the ceiling-mounted air conditioner.

[0008] The automobile generator is connected in parallel with the vehicle power supply through a dual-battery isolation controller, and is connected in parallel with the 12V DC power consumption part through a No. 2 isolation switch.

[0009] Furthermore, the 12V DC power-consuming parts include cable reels, balancing legs, rail trolleys, warehouse lighting, and a calling system.

[0010] Furthermore, the 220V AC power supply includes calibration instruments, monitoring systems, external lighting, sockets, and air conditioners.

[0011] The general use process of the present invention is as follows:

[0012] In the absence of AC power, the on-board power supply is used to supply power to various electrical equipment on the transformer test vehicle, to carry out the work before the on-site test (including the process of various test equipment being in place, various monitoring instruments being ready, and various auxiliary facilities being ready) and the work of collecting the vehicle after the test (which is exactly the opposite of the work before the test, including the collection of various test equipment, the resetting of various monitoring instruments, the collection of various auxiliary facilities, etc.).

[0013] When the mains is connected, the power supply conversion between the mains and the vehicle power supply is realized in real time, and all power-consuming equipment is converted from the original vehicle power supply to the mains power supply, and the mains power can also reversely charge the vehicle power supply. It not only gives full play to the flexible mobility of the vehicle power supply, but also takes into account the stability and reliability of the mains power, realizing the complementary advantages of the vehicle power supply and the mains power.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. Realize the complementary advantages of the on-board power supply (UPS battery) and the mains (220V / 380V) of the transformer detection vehicle power distribution system. It not only gives full play to the flexible mobility of the on-board power supply, but also takes into account the stability and reliability of the mains, solves the shortcomings of the limited capacity of the on-board power supply, makes up for the shortcomings of the insufficient emergency flexibility of the external power supply, and realizes the complementary advantages of the on-board power supply and the mains.

[0016] 2. Under the premise of separate layout of 12V low-voltage DC power equipment and 220V AC power equipment, by setting up functional components such as isolating switches, inverters (including reverse charging function), switching power supplies, and common control switches, the power supply and distribution system is flexible and convenient in terms of power selection and equipment control. In the absence of mains power, the transformer test vehicle can realize functions such as equipment retraction and deployment, normal lighting, routine monitoring, and routine control, providing humanized power distribution support for transformer field tests; in the presence of mains power, high-power power equipment can be turned on in time to achieve voltage and current boosting, conduct transformer field tests, and charge and store energy for the on-board power supply in time.

[0017] 3. It can provide two power supply and distribution schemes: conventional power supply and distribution mode and emergency power supply and distribution mode. In the case of failure of the conventional power supply and distribution mode, the emergency power supply and distribution mode can be enabled through the function control element to provide an emergency power supply and distribution scheme for field tests. Even in extreme cases such as failure of the conventional power supply and distribution mode, no external AC power supply, insufficient on-board power supply, etc., the car generator can be used to directly power the 12V DC power-consuming equipment, giving priority to the power supply of the balancing legs, rail trolleys, and cable drums, and the balancing legs, rail trolleys, and cable drums can be retracted in time, thereby ensuring the timely return of the vehicle.

[0018] 4. The vehicle-mounted mobile power supply has two charging methods: mains charging and car generator charging, which is safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the overall design diagram of the present invention.

[0020] Figure 2 It is a functional diagram of the present invention.

[0021] Figure 3 This is a diagram of a separate power supply for a vehicle-mounted power supply of the present invention.

[0022] Figure 4 It is the external power supply diagram of the present invention.

[0023] Figure 5 It is a diagram of the vehicle power charging system of the present invention.

[0024] Figure 6 It is a system diagram of the emergency power distribution mode of the present invention.

[0025] Figure 7 It is a diagram of the direct power supply system of the generator of the present invention. DETAILED DESCRIPTION

[0026] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0028] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the instructions and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0029] The high-voltage power transformer on-site inspection vehicle can be divided into three parts according to the function from the front to the rear of the vehicle: the cab, the operation cabin, and the equipment cabin. The present invention mainly solves the power supply and distribution of the following functional modules of the transformer inspection vehicle:

[0030] (1) Operation cabin lighting (2) Equipment cabin lighting (3) Warning call system (4) Cable reel actuation mechanism (5) Vehicle body balance leg control system (6) Test equipment slide-out track control system (7) Calibration instrument (8) Monitoring system (9) External vehicle test lighting system (10) 220V AC power supply system (11) Air conditioning system.

[0031] like Figure 1 As shown, the system of the present invention includes a vehicle-mounted mobile power supply, a No. 1 isolating switch, a No. 2 isolating switch, a vehicle generator, a vehicle battery, a dual-battery isolation controller, an inverter power supply, a 12V DC power consumption part, a 220V AC power consumption part, and an isolation transformer.

[0032] The vehicle-mounted power supply is connected in parallel with the 12V DC power consumption part and the 220V AC power consumption part through the No. 1 isolating switch, the inverter power supply, and the switching power supply, and is connected in parallel with the 12V DC power consumption part through the No. 2 isolating switch.

[0033] The city electricity is connected in parallel with the 12V DC power consumption part, the 220V AC power consumption part, and the vehicle power supply through the isolation transformer, the No. 1 isolation switch, the inverter power supply, the switching power supply, and the 220V AC power consumption part through the No. 2 isolation switch, and the ceiling-mounted air conditioner.

[0034] The automobile generator is connected in parallel with the vehicle power supply through a dual-battery isolation controller, and is connected in parallel with the 12V DC power consumption part through a No. 2 isolation switch.

[0035] The 12V DC power-consuming parts include cable reels, balancing legs, rail trolleys, warehouse lighting, and a calling system.

[0036] The 220V AC power supply includes calibration instruments, monitoring systems, external lighting, sockets, and air conditioners.

[0037] like Figure 2 As shown, the present invention only performs power distribution design for monitoring, control, lighting and other functions in the transformer detection vehicle, and does not include power supply design for voltage test and current test, nor does it include other functional designs other than power supply and distribution functions.

[0038] The specific working principle and operation mode are as follows:

[0039] (1) The on-board power supply is used for pre-test preparation work

[0040] After the test vehicle arrives at the site and stops at the selected test location, use the vehicle power supply to complete the preparations before the test. The specific operations are as follows:

[0041] a. Close isolating switch No. 1.

[0042] b. Close the inverter power switch.

[0043] c. Close the power switch.

[0044] d. Close the balance leg switch and level the balance legs to keep the vehicle balanced.

[0045] e. Close the lighting switches in the warehouse (including the operation compartment and equipment compartment) and turn on the lighting system.

[0046] f. Close the calling system switch and turn on the external warning broadcast and internal monitoring.

[0047] g. Close the cable reel switch and release the ground wire and power supply wire.

[0048] h. Close the railcar switch and slide the test equipment out through the railcar.

[0049] i. Close the control switch of the tester / monitoring system / exterior lighting (night time) / 220V socket.

[0050] (a) to (i) are operated in sequence, (d) to (h) are the 12V DC power supply part, and (i) is the 220V AC power supply part. So far, the preparation work for the entire field test has been completed using the vehicle power supply. The power supply and distribution diagram is shown in Figure 3 As shown, the vehicle power supply is supplied alone at this time.

[0051] (2) Connect an external power supply to supply power for on-site testing

[0052] like Figure 4 As shown, on the basis of doing the preparatory work before the test, connect to the mains to supply and distribute power for the test work. The specific operations are as follows:

[0053] (a) Ground the released grounding wire securely.

[0054] (b) Connect the released external power cord to the AC power supply port. The external power cord connector is located at the front end of the isolation transformer.

[0055] (c) The inverter power automatically starts the mains priority function and reverse charging function. At this time, the vehicle power supply switches from external power supply to charging mode. Figure 3 The power supply for the electrical equipment in the vehicle is converted from the on-board power supply to the external AC power supply.

[0056] (d) Turn on the ceiling air conditioner.

[0057] (e) Conduct field tests together with the power supply and distribution system of the test equipment.

[0058] (3) The car generator charges the vehicle power supply

[0059] like Figure 5 As shown, the vehicle power supply is charged during the driving process of the vehicle. At this time, in the default state where all switches are disconnected, the KM31 control switch is closed, thereby closing the KM31 relay switch, so that the vehicle power supply can be charged in time during driving.

[0060] (4) Emergency power distribution mode

[0061] like Figure 6 As shown in the figure, the conventional power supply and distribution mode fails, causing the main distribution line to be unable to be used normally. The emergency power distribution mode is activated. The specific operations are as follows:

[0062] (a) Based on the above operations (the ground wire and external AC power have been connected normally), first restore all switches to the off state.

[0063] (b) Close isolating switch No. 2.

[0064] (c) Close the low-voltage DC control switches of the cable reel / interior lighting / call system / balance legs / rail trolley, etc., and use the on-board power supply to directly supply power, so that the operations interrupted by the fault can proceed normally and the test vehicle can be deployed (or retracted) in time.

[0065] (d) The control switches of 220V AC electrical equipment such as the closed calibrator / monitoring system / exterior lighting (if necessary) / sockets are directly powered by the mains through the No. 2 isolating switch.

[0066] In the event of a failure in the main power distribution mode, emergency power supply and distribution can be achieved through the above operations.

[0067] (5) On-board generator direct power supply function

[0068] like Figure 7 As shown in the figure, in extreme cases such as failure of the conventional power supply and distribution mode, no external mains power supply, no power on the vehicle power supply, the on-site environment is bad, time and weather require the vehicle and personnel to return as soon as possible, at this time, the power supply and distribution guarantee for the safe recovery of the test device should be considered first. The specific operations are as follows:

[0069] (a) Disconnect all control switches, cut off and remove the AC power and grounding wires, and restore all equipment to their original state.

[0070] (b) Close isolating switch No. 2.

[0071] (c) Start the vehicle and put the generator into operation.

[0072] (d) Close the KM31 control switch and close the KM31 relay switch.

[0073] (e) Close the 12V DC electrical appliance control switch that requires electricity.

[0074] At this time, the car generator directly supplies power to the 12V DC electrical equipment through the No. 2 isolation switch, which can ensure that the test vehicle is safely recovered in the first time, and the vehicle and personnel can return safely from the field.

[0075] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A power supply and distribution system for a high-voltage power transformer on-site detection vehicle, characterized in that: The system includes a vehicle power supply, a No. 1 isolating switch, a No. 2 isolating switch, a vehicle generator, a vehicle battery, a dual-battery isolation controller, an inverter power supply, a 12V DC power supply part, a 220V AC power supply part, and an isolation transformer; The vehicle-mounted power supply is connected in parallel with the 12V DC power consumption part and the 220V AC power consumption part through the No. 1 isolating switch, the inverter power supply, and the switching power supply, and is connected in parallel with the 12V DC power consumption part through the No. 2 isolating switch; The external power supply is connected in parallel with the 12V DC power supply, 220V AC power supply, and vehicle power supply through the isolation transformer, No. 1 isolation switch, inverter power supply, and switching power supply, and connected in parallel with the 220V AC power supply through No. 2 isolation switch, and connected in parallel with the ceiling air conditioner; The automobile generator is connected in parallel with the vehicle power supply through the dual battery isolation controller, and is connected in parallel with the 12V DC power consumption part through the No. 2 isolation switch; When the on-board power supply is used for pre-test preparation, close the No. 1 isolating switch, the inverter power switch, the switch power switch, the 12V DC power supply switch, and the 220V AC power supply switch; When an external power supply is connected to supply power for field tests, the grounding wire is reliably grounded, the external power supply line connector is located at the front end of the isolation transformer, and the inverter power supply automatically starts the external power supply priority function and the reverse charging function. The external power supply charges the vehicle power supply and supplies power to the electrical equipment at the same time; When in emergency power distribution mode, the ground wire and external power supply are connected normally. First, restore all switches to the off state, close the No. 2 isolation switch, close the 12V DC power supply switch, and close the 220V AC power supply switch; When the on-board generator is supplying power, cut off all control switches, external power supplies, and grounding wires, close the No. 2 isolation switch, start the vehicle, and the car generator supplies power to the 12V DC power consumption part.

2. A power supply and distribution system for a high-voltage power transformer on-site detection vehicle according to claim 1, characterized in that: The 12V DC power-consuming parts include cable reels, balancing legs, rail trolleys, warehouse lighting, and a calling system.

3. A power supply and distribution system for a high-voltage power transformer on-site detection vehicle according to claim 1, characterized in that: The 220V AC power supply includes calibration instruments, monitoring systems, external lighting, sockets, and air conditioners.

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