Fault simulation universal wiring transformer device

Abstract

The invention discloses a fault simulation universal wiring transformer device which is of an integrated structure, the phases are A, B and C, an iron core type can be switched between a three-phase three-column mode and a three-phase five-column mode, a primary side outgoing line terminal is at least provided with three capacitive type bushings with end screens, high-voltage and low-voltage coils are led to an outgoing line terminal panel, and the high-voltage and low-voltage coils are connected with the outgoing line terminal panel. Various wiring modes can be simulated at taps outside the panel, an adjustable resistor and an adjustable capacitor can be connected in series and in parallel at specific parts of the transformer, and various faults can be simulated by adjusting values of the adjustable resistor and the adjustable capacitor and controlling on and off of a switch. The system is wide in coverage, can simulate most abnormalities and faults of the transformer, and is remarkable in teaching and training effect. The fault setting concealment is high, and the mastering degree of students on the transformer fault test method is efficiently assessed; and a good safety protection effect is achieved on testers.

Description

Technical Field

[0001] The invention relates to the field of transformer testing devices, in particular to a fault simulation universal wiring transformer device. Background Art

[0002] Transformers are an important electrical equipment in power systems. Timely detection of transformer faults and targeted solutions are crucial to the safe and stable operation of power systems. Various transformer faults can be diagnosed through a variety of test methods. For various faults, the existing test methods have complex wiring and time-consuming operations. Summary of the invention

[0003] In view of the above problems, the present invention provides a device capable of simulating various fault modes of a transformer to enhance the on-site analysis capability of test personnel.

[0004] In order to achieve the above-mentioned purpose, the present invention provides a fault simulation universal wiring transformer device, which comprises: a three-phase five-column iron core with detachable left and right side columns, wherein the A-phase iron core is wound with the A-phase upper half high-voltage winding, the A-phase lower half high-voltage winding and the A-phase low-voltage winding, the two ends of the A-phase upper half high-voltage winding are provided with A11 and X1 side taps, the middle part of the A-phase upper half high-voltage winding is provided with A12 middle tap, the two ends of the A-phase lower half high-voltage winding are provided with A2 and X2 side taps, and the two ends of the A-phase low-voltage winding are provided with a and x side taps; the B-phase iron core is wound with the B-phase upper half high-voltage winding, the B-phase lower half high-voltage winding and the B-phase low-voltage winding, the two ends of the B-phase upper half high-voltage winding are provided with B11 and Y1 side taps, the middle part of the B-phase upper half high-voltage winding is provided with B12 middle tap , the two ends of the B phase lower half high voltage winding are provided with B2 and Y2 side taps, and the two ends of the B phase low voltage winding are provided with b and y side taps; the C phase upper half high voltage winding, the C phase lower half high voltage winding and the C phase low voltage winding are wound on the C phase iron core, the two ends of the C phase upper half high voltage winding are provided with C11 and Z1 side taps, the middle part of the C phase upper half high voltage winding is provided with C12 middle tap, the two ends of the C phase lower half high voltage winding are provided with C2 and Z2 side taps, and the two ends of the C phase low voltage winding are provided with c and z side taps, the A phase upper half high voltage winding, the A phase lower half high voltage winding, the B phase upper half high voltage winding, the B phase lower half high voltage winding, the C phase upper half high voltage winding, and the C phase lower half high voltage winding are all double-strand windings, and the A phase low voltage winding, the B phase low voltage winding, and the C phase low voltage winding are all single-strand windings.

[0005] In a preferred manner, when the A-phase winding DC resistance, transformation ratio and partial discharge test fault are performed, the circuit wiring is as follows: an S13 switch connected to the taps on both sides of the A-phase upper half high-voltage winding A11, the other end of the S13 switch is connected to the S1 switch, the S3 switch, the S4 switch, the S10 switch, and one end of the first strand of the A-phase upper half high-voltage winding, the other end of the S1 switch is connected to one end of the second strand of the A-phase upper half high-voltage winding, the other end of the second strand of the A-phase upper half high-voltage winding is simultaneously connected to one end of the S9 and S12 switches, the other end of the S9 switch is connected to the metal tip, and the other end of the S12 switch is connected to the suspension The other end of the S3 switch is connected to the middle part of the first strand of the upper half high-voltage winding of phase A, the middle part of the first strand of the upper half high-voltage winding of phase A is connected to the middle part of the second strand of the upper half high-voltage winding of phase A through the S2 switch, the other end of the S4 switch is connected to the other end of the first strand of the upper half high-voltage winding of phase A through the R1 sliding resistor, the other end of the S10 switch is connected to the other end of the first strand of the upper half high-voltage winding of phase A through the C1 capacitor, and the other end of the first strand of the upper half high-voltage winding of phase A is connected to the taps on both sides of the upper half high-voltage winding X1 of phase A through the parallel S5 switch and R2 sliding resistor;

[0006] The taps on both sides of the A-phase lower half high-voltage winding A2 are connected to one end of the first strand of the A-phase lower half high-voltage winding and one end of the S6 switch, the other end of the first strand of the A-phase lower half high-voltage winding is connected to the taps on both sides of the A-phase lower half high-voltage winding X2, and the other end of the S6 switch is connected to the taps on both sides of the A-phase lower half high-voltage winding X2 through the second strand of the A-phase lower half high-voltage winding;

[0007] The taps on both sides of the A-phase low-voltage winding a are connected to one end of the A-phase low-voltage winding, and the taps on both sides of the A-phase low-voltage winding a are connected to the other end of the A-phase low-voltage winding through the S7 switch and R3 sliding resistor connected in series and the S11 switch and C2 capacitor connected in series, and the other end of the A-phase low-voltage winding is connected to the taps on both sides of the A-phase low-voltage winding x through the S8 switch and R4 sliding resistor connected in parallel;

[0008] The circuit wiring for the B and C phase winding DC resistance, transformation ratio and partial discharge test faults is the same as the circuit wiring for the A phase winding DC resistance, transformation ratio and partial discharge test faults. During wiring, the upper half high-voltage winding tap of phase A is correspondingly replaced by the upper half high-voltage winding tap of phases B and C, the lower half high-voltage winding tap of phase A is correspondingly replaced by the lower half high-voltage winding tap of phases B and C, and the low-voltage winding tap of phase A is correspondingly replaced by the low-voltage winding tap of phases B and C.

[0009] In a preferred manner, when an insulation test fault is performed, the circuit wiring is: S17 switch, S18 switch, S19 switch, S20 switch, R9 resistor, and R11 resistor connected to a certain phase high-voltage winding, the S20 switch is connected to one end of the R11 resistor through the C5 adjustable capacitor, the S19 switch is connected to one end of the R11 resistor through the R12 sliding resistor and is also connected to the iron core, the iron core is also grounded through the S23 switch, the S24 switch connected in series, the R7 resistor, and the R8 sliding resistor, the S18 switch is connected to one end of the R9 resistor through the C4 adjustable capacitor, the S17 switch is connected to one end of the R10 sliding resistor and is also connected to the certain phase low-voltage winding, one of the other two phases of the low-voltage winding is connected to the iron core through the S22 switch connected in series with the C3 adjustable capacitor, the S21 switch connected in series with the R6 sliding resistor, and the R5 resistor, the common end of the A, B, and C phase high-voltage windings is connected, and the common end of the A, B, and C phase low-voltage windings is connected.

[0010] In a preferred embodiment, the bushings of the A-phase high-voltage winding, the B-phase high-voltage winding, and the C-phase high-voltage winding are all 10kV capacitor-type bushings with end screens.

[0011] The beneficial effects of the present invention are: wide coverage, capable of simulating most abnormalities and faults of transformers, and having remarkable teaching and training effects; the fault setting is highly concealed, and the trainees' mastery of transformer fault test methods can be efficiently assessed; and there is a good safety protection effect on test personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the iron core and winding structure of the present invention;

[0013] Figure 2 It is a schematic diagram of the outlet terminal panel of the present invention;

[0014] Figure 3 It is a schematic diagram of the DC resistance, transformation ratio and partial discharge test fault setting principle of the present invention;

[0015] Figure 4 It is a schematic diagram of the insulation fault setting principle of the present invention;

[0016] Figure 5 It is a schematic diagram of the principle of setting the high-voltage side bushing fault of the present invention;

[0017] Figure 6 A schematic diagram of the winding radial deformation fault setting principle of the present invention;

[0018] Figure 7 It is a schematic cross-sectional diagram of a radial deformation fault winding of the present invention;

[0019] Figure 8 A schematic diagram of the winding axial deformation fault setting principle of the present invention;

[0020] Fig. 9 It is a schematic diagram of the combination of software and hardware of the present invention;

[0021] Fig.10 It is a flowchart for realizing the software functions of the present invention;

[0022] Fig.11 A schematic diagram of the relationship between faults and switch on / off of the present invention;

[0023] Fig.12 It is a schematic diagram of the relationship between various insulation faults and switch on-off of the present invention. DETAILED DESCRIPTION

[0024] Embodiment 1:

[0025] In order to enable test personnel to efficiently learn various transformer fault test methods and improve test analysis capabilities, a transformer with fault simulation function is designed. Various faults can be simulated by changing the core structure, changing the wiring method, connecting adjustable resistors and adjustable capacitors in series and in parallel, and controlling the switch opening and closing state. Various faults can be intelligently set and controlled by combining the host computer and the control core software and hardware, and corresponding maintenance strategies are given for training, teaching and assessment. The fault simulation universal wiring transformer device is an integrated structure, which is characterized by: the phases are A, B, and C, the core type can be mechanically switched between three-phase three-column and three-phase five-column, and the primary side outlet terminal is equipped with at least three capacitor-type bushings with end screens. The high-voltage and low-voltage coils are led to the outlet terminal panel, and various wiring methods can be simulated at the tap outside the panel. Adjustable resistors and adjustable capacitors can also be connected in series and in parallel at specific parts of the transformer, and various faults can be simulated by adjusting their values ​​and controlling the switch opening and closing. The fault setting and adjustment method is the joint intelligent adjustment of the host computer and the control core. Through the intelligent wiring and line changing method that combines software and hardware, technical support is provided for scientific researchers, transformer operation and maintenance personnel, teaching and training, etc.

[0026] by Figure 1 For reference, the overall description of the fault simulation universal wiring transformer is given.

[0027] Figure 1 This is a schematic diagram of the iron core and winding structure of the invention.

[0028] The transformer core is a three-phase five-column type, and the outermost core columns on the left and right sides are detachable, so that the transformer core type can be changed between three columns and five columns, thereby simulating the change of zero-sequence impedance during the test process when the core structure is different.

[0029] Both high-voltage and low-voltage windings are made of copper coils, and the three phases A, B, and C are tightly wound on the middle three-column iron core in sequence. The high-voltage three-phase winding is divided into two parts with the same number of turns, and the low-voltage winding is located between the upper and lower parts of the high-voltage winding.

[0030] The upper part of each phase of the high-voltage winding has a tap in the middle, which can be short-circuited externally to simulate a turn-to-turn short circuit. The three phases of the high-voltage winding are all wound in parallel with two strands, and the two strands can be controlled to be split and combined to simulate a broken strand of the winding.

[0031] Figure 2 This is a schematic diagram of the output terminal panel.

[0032] The upper and lower parts of the high-voltage three-phase winding have lead-out terminals at both ends and the middle tap of the upper half, which are connected to the terminal panel at the top of the transformer. Y, D and Z types of wiring can be performed on the panel. The low-voltage winding has lead-out terminals at both ends to the terminal panel at the top of the transformer, which can be used with the high-voltage winding for Y, D, and Z types of wiring. Taking phase A as an example, the two ends of the upper half of the high-voltage winding are A1 and X1, and the middle tap A12 is set between the two. The two ends of the lower half of the high-voltage winding are A2 and X2, and the two ends of the low-voltage winding are a and x.

[0033] Figure 3 Schematic diagrams for DC resistance, turns ratio, partial discharge and winding deformation fault settings.

[0034] Taking phase A as an example, a tap A12 is provided in the middle of the upper half of the high-voltage winding. By controlling the opening and closing of switch S3, a short-circuit fault between turns of the winding can be simulated, thereby affecting the DC resistance and transformation ratio test.

[0035] The three phases of the high voltage winding are all wound in parallel with two strands, and the two strands can be controlled to be separated and combined. By controlling the opening and closing of switches S1, S2, and S6, a broken strand fault in the winding can be simulated, thereby affecting the DC resistance test.

[0036] A control switch S13 is provided at the end of the high-voltage winding, and disconnecting S13 can simulate a phase failure.

[0037] Both the high-voltage winding and the low-voltage winding are connected in series and in parallel with adjustable resistors, which affects the DC resistance test. The change of the DC resistance value on the high-voltage side can be achieved by controlling the opening and closing of switches S4 and S5 and adjusting the resistance values ​​of resistors R1 and R2. The change of the DC resistance value on the low-voltage side can be achieved by controlling the opening and closing of switches S7 and S8 and adjusting the resistance values ​​of resistors R3 and R4.

[0038] A metal tip burr and a floating potential are connected in series to the upper half of the high-voltage winding. The opening and closing of the switch S9 is controlled to simulate corona partial discharge, and the opening and closing of the switch S12 is controlled to simulate floating potential partial discharge.

[0039] A capacitor is connected in parallel to the high-voltage winding and the low-voltage winding respectively, and the winding deformation test result can be changed by controlling the opening and closing of switches S10 and S11.

[0040] The relationship between various faults and switch on and off is as follows Fig.11As shown, 0 represents the switch is open and 1 represents the switch is closed.

[0041] Figure 4 Set up the schematic diagram for insulation fault.

[0042] Figure 4 The medium and high voltage windings and low voltage windings are connected with Y-type wiring, and the same is true for other types of wiring. An adjustable resistor and an adjustable capacitor are connected in parallel between the high voltage winding, the low voltage winding and the iron core. By adjusting the resistance of the adjustable resistor and the capacitance of the adjustable capacitor and controlling the opening and closing of the switch, the poor insulation and dielectric loss factor of the winding main insulation can be simulated, which can also affect the results of measuring the winding deformation by the frequency response method and the short-circuit impedance method.

[0043] An adjustable resistor is connected in parallel between the iron core and the ground to simulate poor insulation of the iron core to the ground.

[0044] The relationship between various insulation faults and switch on and off is as follows Fig.12 As shown, 0 represents the switch is open and 1 represents the switch is closed.

[0045] Figure 5 This is a schematic diagram of the principle of setting the fault of the capacitive bushing on the high-voltage side. The bushings of each phase on the high-voltage side are 10kV capacitive bushings with end screens. The primary winding to ground capacitance is C6, the bushing main capacitance is C7, and the end screen to ground capacitance is C8. An adjustable resistor R13 and an adjustable capacitor C9 are connected in parallel between the primary winding conductor and the end screen. By controlling the opening and closing of switches S14 and S16 and adjusting the values ​​of the adjustable resistor R13 and the adjustable capacitor C9, the poor dielectric loss factor of the bushing is simulated.

[0046] An adjustable resistor R14 is connected in parallel between the end screen and the ground. By controlling the opening and closing of the switch S15 and adjusting the value of the adjustable resistor R14, poor insulation between the end screen of the bushing and the ground is simulated.

[0047] Figure 6-8 The schematic diagram of the principle of setting the winding deformation fault. When the transformer winding is working normally, the current passes through the terminals in the order of K1, K2, S, K3, and K4. The beginning of the winding is K1, and the end is K4. S is a switch used to switch the connection between different terminals to realize the transformer winding deformation fault simulation.

[0048] Fault 1 Radial deformation: Figure 6 The dashed rectangle shown is the radial deformation fault winding produced, and its top view is as follows Figure 7 As shown. When the winding is operating normally, the faulty winding is not connected, and K2 is connected to K3. When the switch S is switched from K3 to K5, the output terminal also becomes K6, and the faulty winding is connected to simulate the radial deformation of the transformer winding.

[0049] Fault 2 Axial deformation: Figure 8The dashed rectangle is the manufactured axial deformation fault winding. When the winding is operating normally, the fault winding is not connected, and K2 is connected to K3. When the switch S is switched from K3 to K5, the output terminal also changes to K6, and the fault winding is connected to simulate the axial deformation of the transformer winding.

[0050] Fault 3 Turn-to-turn short circuit: Figure 6 As shown, when the switch S is directly connected to K4, the winding from K3 to K4 is short-circuited, which is used to simulate the short circuit between the turns of the transformer winding.

[0051] Fig. 9 Schematic diagram of the combination of software and hardware.

[0052] The fault simulation universal wiring transformer device system consists of a transformer body, a robotic arm, a servo motor, a control core, a visual subsystem, an image processing subsystem and a host computer. Fig. 9 The working process is as follows: if it is necessary to set a fault or change the transformer connection mode, a control signal is sent from the control computer to the control center, and the control center issues a command to make the servo motor drive the mechanical arm to rotate and drive the switch to switch the transformer between three-phase three-column and three-phase five-column; the control center can also issue a command to control the output relay, and the relay is connected to the conversion interface circuit to realize fault simulation.

[0053] Part of the camera in the system is used to capture the situation at the fault location of the transformer and to observe the real information of the fault simulation location; part of the camera is used to capture the status of the test personnel. The image captured by the camera is transmitted to the image processing computer through the bus. The image is pre-processed by the computer and the extracted image feature information is transmitted to the computer for further processing. Once a violation of regulations or injury to the operator occurs during the test, the image processing computer will send a signal to the control computer to cut off the power to the transformer body, thereby protecting the test personnel.

[0054] Fig.10 Implement a flow chart for software functionality.

[0055] The fault simulation universal wiring transformer host computer uses a PC with Windows operating system, which can achieve: establishing, storing, judging and analyzing various transformer wiring fault types and simulation schemes, and forming corresponding transformer abnormalities and fault maintenance strategies; one simulation scheme corresponds to one or more fault types; the transformer simulation wiring state parameters required by the set fault type can be set.

[0056] The PLC control system controls the simulated transformer to simulate the fault according to the acquired fault type, and is connected to the main circuit of the simulated transformer through the PLC bus. The fault simulation can also be set by remote control using wireless methods such as infrared / Bluetooth.

[0057] The fault simulation control process of the host computer and PLC controller is as follows:

[0058] (1) Select the simulation scheme on the host computer and input the wiring status data required for the fault type;

[0059] (2) Call the fault type control PLC controller;

[0060] (3) The PLC control system starts the simulated transformer;

[0061] (4) Fault simulation mechanical setting or relay setting of the transformer body;

[0062] (5) When performing fault simulation, the PLC control system determines whether the wiring status of the main body meets the setting. If not, it returns to step (3); if it meets, the test personnel determines the fault type;

[0063] (6) After the fault type is determined, the PLC control system sends the test results back to the host computer, which compares them with the set parameters. If the comparison results are the same, the process ends; if the comparison results are different, fault diagnosis can continue.

[0064] Embodiment 2:

[0065] A fault simulation universal wiring transformer device, comprising: a three-phase five-column iron core with detachable left and right side columns, wherein an A-phase upper half high-voltage winding, an A-phase lower half high-voltage winding and an A-phase low-voltage winding are wound on the A-phase iron core, A11 and X1 taps are arranged on both ends of the A-phase upper half high-voltage winding, A12 middle tap is arranged on the middle part of the A-phase upper half high-voltage winding, A2 and X2 taps are arranged on both ends of the A-phase lower half high-voltage winding, and a and x taps are arranged on both ends of the A-phase low-voltage winding; an B-phase upper half high-voltage winding, a B-phase lower half high-voltage winding and a B-phase low-voltage winding are wound on the B-phase iron core, B11 and Y1 taps are arranged on both ends of the B-phase upper half high-voltage winding, B12 middle tap is arranged on the middle part of the B-phase upper half high-voltage winding, and a B-phase low-voltage winding is wound on the B-phase iron core. The two ends of the high-voltage winding of the phase A are provided with taps on both sides of B2 and Y2, and the two ends of the low-voltage winding of the phase B are provided with taps on both sides of b and y; the upper half high-voltage winding of the phase C, the lower half high-voltage winding of the phase C and the low-voltage winding of the phase C are wound on the C-phase core, the two ends of the high-voltage winding of the phase C are provided with taps on both sides of C11 and Z1, the middle part of the high-voltage winding of the phase C is provided with a C12 middle tap, the two ends of the high-voltage winding of the phase C are provided with taps on both sides of C2 and Z2, and the two ends of the low-voltage winding of the phase C are provided with taps on both sides of c and z, the upper half high-voltage winding of the phase A, the lower half high-voltage winding of the phase A, the upper half high-voltage winding of the phase B, the lower half high-voltage winding of the phase B, the upper half high-voltage winding of the phase C, and the lower half high-voltage winding of the phase C are all double-strand windings, and the low-voltage winding of the phase A, the low-voltage winding of the phase B and the low-voltage winding of the phase C are all single-strand windings.

[0066] When performing the A-phase winding DC resistance, transformation ratio and partial discharge test fault, the circuit wiring is: an S13 switch connected to the taps on both sides of the A-phase upper half high-voltage winding A11, the other end of the S13 switch is connected to the S1 switch, the S3 switch, the S4 switch, the S10 switch, and one end of the first strand of the A-phase upper half high-voltage winding, the other end of the S1 switch is connected to one end of the second strand of the A-phase upper half high-voltage winding, the other end of the second strand of the A-phase upper half high-voltage winding is simultaneously connected to one end of the S9 and S12 switches, the other end of the S9 switch is connected to the metal tip, and the other end of the S12 switch is connected to the floating potential The other end of the S3 switch is connected to the middle part of the first strand of the upper half high-voltage winding of phase A, the middle part of the first strand of the upper half high-voltage winding of phase A is connected to the middle part of the second strand of the upper half high-voltage winding of phase A through the S2 switch, the other end of the S4 switch is connected to the other end of the first strand of the upper half high-voltage winding of phase A through the R1 sliding resistor, the other end of the S10 switch is connected to the other end of the first strand of the upper half high-voltage winding of phase A through the C1 capacitor, and the other end of the first strand of the upper half high-voltage winding of phase A is connected to the taps on both sides of the upper half high-voltage winding X1 of phase A through the parallel S5 switch and R2 sliding resistor;

[0067] The taps on both sides of the A-phase lower half high-voltage winding A2 are connected to one end of the first strand of the A-phase lower half high-voltage winding and one end of the S6 switch, the other end of the first strand of the A-phase lower half high-voltage winding is connected to the taps on both sides of the A-phase lower half high-voltage winding X2, and the other end of the S6 switch is connected to the taps on both sides of the A-phase lower half high-voltage winding X2 through the second strand of the A-phase lower half high-voltage winding;

[0068] The taps on both sides of the A-phase low-voltage winding a are connected to one end of the A-phase low-voltage winding, and the taps on both sides of the A-phase low-voltage winding a are connected to the other end of the A-phase low-voltage winding through the S7 switch and R3 sliding resistor connected in series and the S11 switch and C2 capacitor connected in series, and the other end of the A-phase low-voltage winding is connected to the taps on both sides of the A-phase low-voltage winding x through the S8 switch and R4 sliding resistor connected in parallel;

[0069] The circuit wiring for the B and C phase winding DC resistance, transformation ratio and partial discharge test faults is the same as the circuit wiring for the A phase winding DC resistance, transformation ratio and partial discharge test faults. During wiring, the upper half high-voltage winding tap of phase A is correspondingly replaced by the upper half high-voltage winding tap of phases B and C, the lower half high-voltage winding tap of phase A is correspondingly replaced by the lower half high-voltage winding tap of phases B and C, and the low-voltage winding tap of phase A is correspondingly replaced by the low-voltage winding tap of phases B and C.

[0070] When performing an insulation test fault, the circuit wiring is: S17 switch, S18 switch, S19 switch, S20 switch, R9 resistor, and R11 resistor connected to a certain phase high-voltage winding. The S20 switch is connected to one end of the R11 resistor through the C5 adjustable capacitor, and the S19 switch is connected to one end of the R11 resistor through the R12 sliding resistor and is also connected to the iron core. The iron core is also grounded through the S23 switch and the series-connected S24 switch and the R7 resistor and the R8 sliding resistor. The S18 switch is connected to one end of the R9 resistor through the C4 adjustable capacitor and the S17 switch through the R10 sliding resistor and is also connected to the certain phase low-voltage winding. One of the other two phases of the low-voltage winding is connected to the iron core through the series-connected S22 switch and the C3 adjustable capacitor, the series-connected S21 switch and the R6 sliding resistor, and the R5 resistor. The common ends of the A, B, and C phase high-voltage windings are connected, and the common ends of the A, B, and C phase low-voltage windings are connected.

[0071] The bushings of the A-phase high-voltage winding, the B-phase high-voltage winding, and the C-phase high-voltage winding are all 10kV capacitor-type bushings with end screens.

[0072] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A fault simulation universal wiring transformer device, characterized in that: It includes: A three-phase five-column iron core with detachable left and right side columns, wherein the A-phase iron core is wound with the A-phase upper half high-voltage winding, the A-phase lower half high-voltage winding and the A-phase low-voltage winding, and the two ends of the A-phase upper half high-voltage winding are provided with A11 and X1 taps on both sides, the middle part of the A-phase upper half high-voltage winding is provided with A12 middle tap, the two ends of the A-phase lower half high-voltage winding are provided with A2 and X2 taps on both sides, and the two ends of the A-phase low-voltage winding are provided with a and x taps on both sides; the B-phase iron core is wound with the B-phase upper half high-voltage winding, the B-phase lower half high-voltage winding and the B-phase low-voltage winding, and the two ends of the B-phase upper half high-voltage winding are provided with B11 and Y1 taps on both sides, the middle part of the B-phase upper half high-voltage winding is provided with B12 middle tap, and the two ends of the B-phase lower half high-voltage winding are provided with There are taps on both sides of B2 and Y2, and taps on both sides of the B-phase low-voltage winding are set at both ends of b and y; the C-phase iron core is wound with a C-phase upper half high-voltage winding, a C-phase lower half high-voltage winding and a C-phase low-voltage winding, and taps on both sides of C11 and Z1 are set at both ends of the C-phase upper half high-voltage winding, and a C12 middle tap is set in the middle part of the C-phase upper half high-voltage winding. Taps on both sides of C2 and Z2 are set at both ends of the C-phase lower half high-voltage winding, and taps on both sides of c and z are set at both ends of the C-phase low-voltage winding. The A-phase upper half high-voltage winding, the A-phase lower half high-voltage winding, the B-phase upper half high-voltage winding, the B-phase lower half high-voltage winding, the C-phase upper half high-voltage winding, and the C-phase lower half high-voltage winding are all double-strand windings, and the A-phase low-voltage winding, the B-phase low-voltage winding, and the C-phase low-voltage winding are all single-strand windings.

2. The fault simulation universal wiring transformer device according to claim 1, characterized in that: When performing the A-phase winding DC resistance, transformation ratio and partial discharge test fault, the circuit wiring is: an S13 switch connected to the taps on both sides of the A-phase upper half high-voltage winding A11, the other end of the S13 switch is connected to the S1 switch, the S3 switch, the S4 switch, the S10 switch, and one end of the first strand of the A-phase upper half high-voltage winding, the other end of the S1 switch is connected to one end of the second strand of the A-phase upper half high-voltage winding, the other end of the second strand of the A-phase upper half high-voltage winding is simultaneously connected to one end of the S9 and S12 switches, the other end of the S9 switch is connected to the metal tip, and the other end of the S12 switch is connected to the floating potential The other end of the S3 switch is connected to the middle part of the first strand of the upper half high-voltage winding of phase A, the middle part of the first strand of the upper half high-voltage winding of phase A is connected to the middle part of the second strand of the upper half high-voltage winding of phase A through the S2 switch, the other end of the S4 switch is connected to the other end of the first strand of the upper half high-voltage winding of phase A through the R1 sliding resistor, the other end of the S10 switch is connected to the other end of the first strand of the upper half high-voltage winding of phase A through the C1 capacitor, and the other end of the first strand of the upper half high-voltage winding of phase A is connected to the taps on both sides of the upper half high-voltage winding X1 of phase A through the parallel S5 switch and R2 sliding resistor; The taps on both sides of the A-phase lower half high-voltage winding A2 are connected to one end of the first strand of the A-phase lower half high-voltage winding and one end of the S6 switch, the other end of the first strand of the A-phase lower half high-voltage winding is connected to the taps on both sides of the A-phase lower half high-voltage winding X2, and the other end of the S6 switch is connected to the taps on both sides of the A-phase lower half high-voltage winding X2 through the second strand of the A-phase lower half high-voltage winding; The taps on both sides of the A-phase low-voltage winding a are connected to one end of the A-phase low-voltage winding, and the taps on both sides of the A-phase low-voltage winding a are connected to the other end of the A-phase low-voltage winding through the S7 switch and R3 sliding resistor connected in series and the S11 switch and C2 capacitor connected in series, and the other end of the A-phase low-voltage winding is connected to the taps on both sides of the A-phase low-voltage winding x through the S8 switch and R4 sliding resistor connected in parallel; The circuit wiring for the B and C phase winding DC resistance, transformation ratio and partial discharge test faults is the same as the circuit wiring for the A phase winding DC resistance, transformation ratio and partial discharge test faults. During wiring, the upper half high-voltage winding tap of phase A is correspondingly replaced by the upper half high-voltage winding tap of phases B and C, the lower half high-voltage winding tap of phase A is correspondingly replaced by the lower half high-voltage winding tap of phases B and C, and the low-voltage winding tap of phase A is correspondingly replaced by the low-voltage winding tap of phases B and C.

3. The fault simulation universal wiring transformer device according to claim 1, characterized in that: When performing an insulation test fault, the circuit wiring is: S17 switch, S18 switch, S19 switch, S20 switch, R9 resistor, and R11 resistor connected to a certain phase high-voltage winding. The S20 switch is connected to one end of the R11 resistor through the C5 adjustable capacitor, and the S19 switch is connected to one end of the R11 resistor through the R12 sliding resistor and is also connected to the iron core. The iron core is also grounded through the S23 switch and the series-connected S24 switch and the R7 resistor and the R8 sliding resistor. The S18 switch is connected to one end of the R9 resistor through the C4 adjustable capacitor and the S17 switch through the R10 sliding resistor and is also connected to the certain phase low-voltage winding. One of the other two phases of the low-voltage winding is connected to the iron core through the series-connected S22 switch and the C3 adjustable capacitor, the series-connected S21 switch and the R6 sliding resistor, and the R5 resistor. The common ends of the A, B, and C phase high-voltage windings are connected, and the common ends of the A, B, and C phase low-voltage windings are connected.

4. The fault simulation universal wiring transformer device according to claim 1, characterized in that: The bushings of the A-phase high-voltage winding, the B-phase high-voltage winding and the C-phase high-voltage winding are all 10kV capacitor-type bushings with end screens.

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