CN212379502U

CN212379502U - Integrated intelligent comprehensive test system for transformer

Info

Publication number: CN212379502U
Application number: CN202021187568.6U
Authority: CN
Inventors: 高国富
Original assignee: Hubei Xinshi Electric Power Technology Co ltd
Current assignee: Hubei Xinshi Electric Power Technology Co ltd
Priority date: 2020-06-23
Filing date: 2020-06-23
Publication date: 2021-01-19
Anticipated expiration: 2030-06-23

Abstract

The utility model relates to a transformer integration intelligent integrated test system, including the cabinet body and setting up electrical power generating system, PLC, main control circuit, test integrated unit, compensation electric capacity unit in the cabinet body, electrical power generating system's input is connected with outside three-phase four-wire system power, electrical power generating system's output provides the power respectively for PLC, main control circuit, test integrated unit, the transformer that awaits measuring and compensation electric capacity unit; the PLC is in signal connection with the main control loop and is used for outputting a PLC control signal and feeding back an action signal of the main control loop; the main control loop is in signal connection with the test integration unit and is used for controlling each tester in the test integration unit to respectively test and switch the transformer to be tested, and the compensation capacitor unit provides reactive compensation for the power supply system. The utility model discloses have highly integrated, experimental switching automation, the degree of accuracy and reliability, the test efficiency is high, artifical mishandling rate greatly reduced, the experiment system structure is simplified by a wide margin, uses more convenient, high-efficient.

Description

Integrated intelligent comprehensive test system for transformer

Technical Field

The utility model relates to a transformer detects technical field, concretely relates to transformer integration intelligent integrated test system.

Background

With the continuous development of economy in China, the power industry in China also obtains great development, and has higher requirements on power equipment, particularly transformers. In the current stage, the detection of a transformer by a detection center of huge power equipment and power detection departments such as power supply enterprises, large-scale factories, metallurgy, power plants, railways and the like is performed by using a single experimental instrument for manual wiring. The transformer detection is an important means for detecting and judging the quality, reliability and performance indexes of the transformer, and the traditional transformer detection has the problems of complex operation and high manual misoperation rate.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the technical problem who exists among the prior art, provide a transformer integration intelligent integrated test system, it has high integration, experimental switching automation, the degree of accuracy and reliability for test efficiency improves greatly, artifical mishandling rate greatly reduced, and the experimental system structure is simplified by a wide margin, uses more convenient, high-efficient.

The utility model provides an above-mentioned technical problem's technical scheme as follows:

an integrated intelligent comprehensive test system for a transformer comprises a cabinet body, and a power supply system, a main control loop, a PLC, a test integration unit and a compensation capacitor unit which are arranged in the cabinet body, wherein the input end of the power supply system is connected with an external three-phase four-wire system power supply, and the output end of the power supply system respectively provides power for the PLC, the main control loop, the test integration unit, the transformer to be tested and the compensation capacitor unit; the PLC is in signal connection with the main control loop and is used for outputting a PLC control signal and feeding back an action signal of the main control loop; the main control loop is in signal connection with the test integration unit and is used for controlling each tester in the test integration unit to respectively test and switch the transformer to be tested, and the compensation capacitor unit provides reactive compensation for a power supply system.

The utility model has the advantages that: the utility model provides a transformer integration intelligence integrated test system, its have high integration, experimental switching automation, degree of accuracy and reliability for experimental efficiency improves greatly, artifical mishandling rate greatly reduced, and the experimental system structure is simplified by a wide margin, uses more conveniently, high-efficiently.

Drawings

FIG. 1 is a wiring diagram of a first module of the PLC of the present invention;

FIG. 2 is an enlarged view of part A of a wiring diagram of a first module of the PLC of the present invention;

FIG. 3 is an enlarged view of the wiring diagram B of the first module of the PLC of the present invention;

FIG. 4 is an enlarged view of the C portion of the wiring diagram of the first module of the PLC of the present invention;

FIG. 5 is a wiring diagram of the second to fifth modules of the PLC of the present invention;

FIG. 6 is an enlarged view of the D part of the second to fifth module wiring diagrams of the PLC of the present invention;

FIG. 7 is an enlarged view of the second to fifth module wiring diagrams E of the PLC of the present invention;

FIG. 8 is a wiring diagram of the control power supply unit of the present invention;

FIG. 9 is a wiring diagram for power frequency test, three-phase zero sequence test, insulation resistance test, three-phase empty load test and single-phase empty load test of the present invention;

FIG. 10 is a wiring diagram for DC resistance and transformation ratio testing of the present invention;

fig. 11 is a wiring diagram of the three-phase frequency conversion source and current-voltage sampling of the present invention;

fig. 12 is a wiring diagram of the compensation capacitor unit of the present invention;

fig. 13 is a wiring diagram of the capacitance compensation controller of the present invention;

fig. 14 is a wiring diagram a of the cooling system, the security system and the access control system of the present invention;

figure 15 is the utility model discloses cooling system, security protection system, access control system wiring diagram b.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

The transformer integrated intelligent comprehensive test system shown in fig. 1-15 comprises a cabinet body, and a power supply system, a main control loop, a PLC, a test integration unit and a compensation capacitor unit which are arranged in the cabinet body, wherein an input end of the power supply system is connected with an external three-phase four-wire system power supply, and an output end of the power supply system respectively provides power for the PLC, the main control loop, the test integration unit, a transformer to be tested and the compensation capacitor unit; the PLC is in signal connection with the main control loop and is used for outputting a PLC control signal and feeding back an action signal of the main control loop; the main control loop is in signal connection with the test integration unit and is used for controlling each tester in the test integration unit to respectively perform test switching on the transformer to be tested, and the compensation capacitor unit provides reactive compensation for the power supply system.

This integrated test system still includes the host computer, and PLC passes through RS485 communication with the host computer, transmits PLC with the control command and the parameter setting of host computer, also transmits the test data of PLC feedback to the host computer and carries out operations such as analysis, demonstration, storage. The PLC of the embodiment adopts a Siemens S7-200-SMART model which is provided with five modules, such as a wiring diagram of a first module in figures 1-4 and a wiring diagram of a second module to five modules in figures 5-7. The PLC is the core of the automatic control of the system, and the upper computer software realizes man-machine interaction through the communication of the butt joint PLC. The test integration unit comprises a plurality of test instruments integrated in the cabinet body, the test instruments communicate with the upper computer in an RS232 communication mode, the upper computer controls the setting and starting and stopping of the test instruments through a communication protocol for butting the test instruments, and the display and extraction of test data are achieved. The communication between the system and the information management and control platform is multi-protocol communication such as TCP-IP and WebService.

A single-phase control power supply unit is arranged in the power supply system, as shown in fig. 8, the control power supply unit is a 220V single-phase power supply, and the control power supply unit can use any one of a U phase, a V phase and a W phase of the power supply system as an L phase, in this embodiment, the U phase is used, and an N phase of a three-phase four-wire system power supply system is used as an N phase of the control power supply unit; the control power supply unit comprises a main control power supply, a first DC module power supply, a second DC module power supply, an instrument power supply, a fan power supply and a capacitance compensation power supply which are connected to the L phase and the N phase through circuit breakers QF 1-QF 6 respectively. As shown in fig. 15, the main control power supply is used to supply power to the main control loop. The output end of the first DC module power supply is configured to supply power to the PLC, as shown in fig. 14, a positive output end D101 of the first DC module power supply outputs +24V voltage, and a negative output end D102 of the first DC module power supply outputs 0V voltage; specifically, as shown in fig. 1 to 7, a positive output end D101 of the first DC module power supply is connected to an L end of each module of the PLC, and a negative output end D102 of the first DC module power supply is connected to an M end of each module of the PLC. And a positive output end D103 of the second DC module power supply outputs +24V voltage, and a negative output end D104 of the second DC module power supply outputs 0V voltage. The second DC module power supply is used for supplying power to other direct current low-voltage modules of the comprehensive test system, such as the direct current low-voltage modules of an access control system, a security system and the like. And the output end of the instrument power supply is provided with a plurality of sockets for supplying power to each test instrument of the test integrated unit. As shown in fig. 13, the capacitance compensation power supply provides 220V single-phase power to the capacitance compensation controller of the compensation capacitance unit.

Further, a vacuum contactor KG4 and a vacuum contactor KG6 are arranged between the power supply system and the transformer to be tested, an intermediate relay KA4 and an intermediate relay KA6 are respectively arranged between the vacuum contactor KG4 and the vacuum contactor KG6 and the PLC, a phase a, a phase B and a phase C of a secondary winding of the transformer to be tested are respectively connected to a phase U, a phase V and a phase W of the power supply system through main contacts of the vacuum contactor KG4, and a phase A, a phase B and a phase C of a primary winding of the transformer to be tested are respectively connected to the phase U, the phase V and the phase W of the power supply system through main contacts of the vacuum contactor KG 6; vacuum contactor KG 4's coil and auxiliary relay KA 4's normally open contact establish ties after with main control power supply forms the return circuit vacuum contactor KG 6's coil and auxiliary relay KA 6's normally open contact establish ties after with main control power supply forms the return circuit, auxiliary relay KA 4's coil auxiliary relay KA 6's coil is connected respectively PLC's wherein two signal output part. The PLC controls the on-off of the vacuum contactor KG4 and the vacuum contactor KG6 by controlling the on-off of the intermediate relay KA4 and the intermediate relay KA6, so that the electrifying condition of the secondary winding and the primary winding of the transformer to be tested is controlled. And normally open contacts of the vacuum contactor KG4 and the vacuum contactor KG6 are respectively connected with a signal input end of the PLC so as to feed back the electrifying condition of the transformer to be tested.

As shown in fig. 10, the test integrated unit includes a dc resistance and transformation ratio test module, the direct-current resistance and transformation ratio testing module comprises a direct-current resistance tester, a transformation ratio tester, an intermediate relay KA8, a vacuum relay KD 1-KD 3, an alternating-current contactor KM-Rab/KM-Rbc/KM-Rca/KM-RAB/KM-RBC/KM-RCA/KM-Bb and an auxiliary contact module KMF-Rab/KMF-Rbc/KM-Rca/KM-RAB/KM-RBC/KM-RCA/KMF-Bb which is correspondingly linked with the alternating-current contactor KM-Rab/KM-Rbc/KM-Rca/KM-RAB/KMF-RBC/KMF-RCA/KMF-Bb one by one; the PLC is used as the signal input of a coil of the intermediate relay KA8 and is connected with a coil terminal of the intermediate relay KA8, one end of a normally open contact of the intermediate relay KA8 is connected with a positive electrode output end D101 of the first DC module power supply, the other end of the normally open contact of the intermediate relay KA8 is connected with one end of a coil of the vacuum relay KD1, a coil of the vacuum relay KD2 and one end of a coil of the vacuum relay KD3 in parallel, and the other ends of the coil of the vacuum relay KD1, the coil of the vacuum relay KD2 and the coil of the vacuum relay KD3 are connected with a negative electrode output end D102 of the first DC module power supply; as shown in fig. 9, one end of a normally open contact of the vacuum relay KD1 is connected to a common node LV _ a between a main contact of the vacuum contactor KG4 and a secondary winding a phase of the transformer to be tested, one end of a normally open contact of the vacuum relay KD2 is connected to a common node LV _ B between a main contact of the vacuum contactor KG4 and a secondary winding B phase of the transformer to be tested, and one end of a normally open contact of the vacuum relay KD3 is connected to a common node LV _ C between a main contact of the vacuum contactor KG4 and a secondary winding C phase of the transformer to be tested; the other end of a normally open contact of the vacuum relay KD1 is connected with the low-voltage side I + end of the direct-current resistance tester through a first pair of normally open contacts of the alternating-current contactor KM-Rab, the other end of a normally open contact of the vacuum relay KD2 is connected with the first pair of normally open contacts of the alternating-current contactor KM-Rbc, and the other end of a normally open contact of the vacuum relay KD3 is connected with the low-voltage side I + end of the direct-current resistance tester through the first pair of normally open contacts of the alternating-current contactor; the other end of the normally open contact of the vacuum relay KD1 is connected with the low-voltage side I-end of the direct-current resistance tester through the second pair of normally open contacts of the alternating-current contactor KM-Rca, the other end of the normally open contact of the vacuum relay KD2 is connected with the second pair of normally open contacts of the alternating-current contactor KM-Rab, and the other end of the normally open contact of the vacuum relay KD3 is connected with the low-voltage side I-end of the direct-current resistance tester through the second pair of normally open contacts of the alternating-current contactor; the other end of a normally open contact of the vacuum relay KD1 is connected with a low-voltage side V + end of the direct-current resistance tester through a third pair of normally open contacts of the alternating-current contactor KM-Rab, the other end of a normally open contact of the vacuum relay KD2 is connected with a third pair of normally open contacts of the alternating-current contactor KM-Rbc, and the other end of a normally open contact of the vacuum relay KD3 is connected with a low-voltage side V + end of the direct-current resistance tester through a third pair of normally open contacts of the alternating-current contactor KM-; the other end of the normally open contact of the vacuum relay KD1 is connected with the low-voltage side V-end of the direct-current resistance tester through the normally open contact of the auxiliary contact module KMF-Rca, the other end of the normally open contact of the vacuum relay KD2 is connected with the normally open contact of the auxiliary contact module KMF-Rab, and the other end of the normally open contact of the vacuum relay KD3 is connected with the low-voltage side V-end of the direct-current resistance tester through the normally open contact of the auxiliary contact module KMF-Rbc; the other end of the normally open contact of the vacuum relay KD1, the other end of the normally open contact of the vacuum relay KD2 and the other end of the normally open contact of the vacuum relay KD3 are respectively connected with the low-voltage side a end, the low-voltage side b end and the low-voltage side c end of the transformation ratio tester through three pairs of normally open contacts of the alternating current contactor KM-Bb; the U phase of the power supply system and the common node HV _ A of the vacuum contactor KG6 are connected with the high-voltage side I + end of the direct-current resistance tester through a first pair of normally-open contacts of the alternating-current contactor KM-RAB, the V phase of the power supply system and the common node HV _ B of the vacuum contactor KG6 are connected with the first pair of normally-open contacts of the alternating-current contactor KM-RBC, and the W phase of the power supply system and the common node HV _ C of the vacuum contactor KG6 are connected with the high-voltage side I + end of the direct-current resistance tester through the first pair of normally-open contacts of the; the U phase of the power supply system and the common node HV _ A of the vacuum contactor KG6 are connected with the high-voltage side I-end of the direct-current resistance tester through a second pair of normally open contacts of the alternating-current contactor KM-RCA, the V phase of the power supply system and the common node HV _ B of the vacuum contactor KG6 are connected with the second pair of normally open contacts of the alternating-current contactor KM-RAB, and the W phase of the power supply system and the common node HV _ C of the vacuum contactor KG6 are connected with the high-voltage side I-end of the direct-current resistance tester through the second pair of normally open contacts of the alternating-current; the U phase of the power supply system and the common node HV _ A of the vacuum contactor KG6 are connected with the high-voltage side V + end of the direct-current resistance tester through the third pair of normally-open contacts of the alternating-current contactor KM-RAB, the V phase of the power supply system and the common node HV _ B of the vacuum contactor KG6 through the third pair of normally-open contacts of the alternating-current contactor KM-RBC, and the W phase of the power supply system and the common node HV _ C of the vacuum contactor KG6 through the third pair of normally-open contacts of the alternating-current contactor KM-RCA; and the U phase of the power supply system and the common node HV _ A, V phase of the vacuum contactor KG6 and the common node HV _ B, W phase of the vacuum contactor KG6 and the common node HV _ C of the vacuum contactor KG6 are also connected with the A end, the B end and the C end of the high-voltage side of the transformation ratio tester through three pairs of normally open contacts of the auxiliary contact module KMF-Bb respectively.

When the low-side direct resistance test is switched, ab: the PLC controls the alternating current contactor KM-Rab and the intermediate relay KA8 to be switched on; bc: the PLC controls an alternating current contactor KM-Rbc and an intermediate relay KA8 to be switched on; ca: and the PLC controls the AC contactor KM-Rac and the intermediate relay KA8 to be switched on. When high-voltage direct resistance switching is carried out, AB: switching on an alternating current contactor KM-RAB and a vacuum contactor KG 6; BC: switching on an alternating current contactor KM-RBC and a vacuum contactor KG 6; CA: and an alternating current contactor KM-RAC and a vacuum contactor KG6 are switched on. The intermediate relay KA8 controls the opening and closing of the vacuum relay KD1, the vacuum relay KD2 and the vacuum relay KD3 to achieve the effect of isolating high voltage. When testing switching is carried out, the auxiliary contact module KMF-Rab is linked with the alternating current contactor KM-Rab, the auxiliary contact module KMF-Rbc is linked with the alternating current contactor KM-Rbc, the auxiliary contact module KMF-Rac is linked with the alternating current contactor KM-Rac, the auxiliary contact module KMF-RAB is linked with the alternating current contactor KM-RAB, the auxiliary contact module KMF-RBC is linked with the alternating current contactor KM-RBC, and the auxiliary contact module KMF-RAC is linked with the alternating current contactor KM-RAC. The alternating current contactor KM-Rab, the alternating current contactor KM-Rbc, the alternating current contactor KM-Rac, the alternating current contactor KM-RAB, the alternating current contactor KM-RBC and the alternating current contactor KM-RAC are respectively provided with a pair of normally open contacts to be connected with a signal input end of the PLC, so that test states of AB direct current resistance, BC direct current resistance, AC direct current resistance, AB direct current resistance, BC direct current resistance and AC direct current resistance are fed back respectively.

When the transformation ratio switching test is carried out, the PLC controls the alternating current contactor KM-Bb, the intermediate relay KA8 and the vacuum contactor KG6 to be switched on, and the auxiliary contact module KMF-Bb is linked with the alternating current contactor KM-Bb, so that the auxiliary contact module KMF-Bb is also switched on at the moment. And a pair of normally open contacts of the alternating current contactor KM-Bb is connected to a signal input end of the PLC so as to feed back a transformation ratio test state. When the alternating current contactor KM-Bb is switched on, the pair of normally open contacts is closed, and the PLC obtains a signal that the transformation ratio test is carried out.

As shown in fig. 11, the test integration unit includes a three-phase variable frequency power supply control module. The three-phase variable frequency power supply control module comprises a three-phase variable frequency power supply SXY1, intermediate relays KA 33-KA 34 and intermediate relays KA 36-KA 37, wherein the three-phase power supply input end of the three-phase variable frequency power supply SXY1 is respectively connected with the U phase, the V phase and the W phase of the power supply system, and the power output end of the three-phase variable frequency power supply SXY1 outputs an adjusted three-phase power supply, such as the three-phase power supply after frequency modulation. The three-phase variable frequency power supply SXY1 in the embodiment can output a three-phase power supply of 50H or 150 Hz. The control power supply input end (for example, the No. 20 wiring terminal of the three-phase variable frequency power supply SXY1 in fig. 11) of the three-phase variable frequency power supply SXY1 is connected with the positive electrode output end D101 of the first DC module power supply. And a feedback signal output end (such as a No. 21 wiring terminal of a three-phase variable frequency power supply SXY1 in fig. 11) of the three-phase variable frequency power supply SXY1 is connected with a signal input end of the PLC and used for alarm feedback of the three-phase variable frequency power supply SXY 1. A 50Hz control end (such as a No. 5 wiring terminal of a three-phase variable frequency power supply SXY1 in FIG. 11) of the three-phase variable frequency power supply SXY1 is connected in series with a normally open contact of the intermediate relay KA33, and a coil of the intermediate relay KA33 is connected in series with a signal output end of the PLC; the 150Hz control end of the three-phase variable frequency power supply SXY1 (such as the No. 7 wiring terminal of the three-phase variable frequency power supply SXY1 in FIG. 11) is connected with the normally open contact of the intermediate relay KA34 in series, the coil of the intermediate relay KA34 is connected with the signal output end of the PLC in series, and the PLC controls the output power frequency of the three-phase variable frequency power supply SXY1 by controlling the on-off of the intermediate relay KA33 or the intermediate relay KA 34. The start-stop control end (such as the No. 17 wiring terminal and the No. 18 wiring terminal of the three-phase variable frequency power supply SXY1 in FIG. 11) of the three-phase variable frequency power supply SXY1 is connected with the two ends of the normally open contact of the intermediate relay KA36, the coil of the intermediate relay KA36 is connected with the signal output end of the PLC in series, and the PLC controls the start and stop of the three-phase variable frequency power supply SXY1 by controlling the on-off of the intermediate relay KA 36. An output control end (such as a23 th wiring terminal and a24 th wiring terminal of a three-phase variable frequency power supply SXY1 in fig. 11) of the three-phase variable frequency power supply SXY1 is connected with a normally open contact of the intermediate relay KA37, a coil of the intermediate relay KA37 is connected with a signal output end of the PLC in series, and the PLC controls the power output of the three-phase variable frequency power supply SXY1 by controlling the on-off of the intermediate relay KA 37. And a voltage-regulating return-to-zero control end DA-DA + of the three-phase variable frequency power supply SXY1 (such as a No. 14 wiring terminal and a No. 15 wiring terminal of a three-phase variable frequency power supply SXY1 in figure 11) is respectively connected with an analog quantity output end of the PLC. Specifically, 14 th and 15 th connecting terminals of the three-phase variable frequency source SXY1 are respectively connected to pins 0 and 0M of a PLC analog quantity module PLC5 through 2-core shielding wires for voltage regulation and zero return.

As shown in fig. 11, the test integrated unit includes a current voltage sampling module. The current and voltage sampling module comprises precision current transformers CT 1-CT 3, current sensors TAA 1-TAA 3, voltage sensors TVV 1-TVV 3, a power analyzer YQ1, an alternating current contactor KM32, an alternating current contactor KM33, an alternating current contactor KM27, a movable auxiliary contact module KM27F linked with the alternating current contactor KM27, an intermediate relay KA1, an intermediate relay KA3 and an intermediate relay KA24, primary coils of the precision current transformers CT 1-CT 3 are respectively connected with the U phase, the V phase and the W phase output by a three-phase variable frequency power supply SXY1 in series, one ends of secondary coils of the precision current transformers CT 1-CT 3 are respectively connected with the input ends of the current sensors TAA 1-TAA 3 through the main contact of the alternating current contactor KM32, the other ends of the secondary coils of the precision current transformers CT 1-CT 3 are grounded, and the output ends of the current sensors TAA 1-TAA 3 are respectively connected with the YQ1 current channel IA 1 of the power analyzer YQ1, IB. IC, the low pressure current channel Ia, Ib, IC of power analysis appearance YQ1 ground connection respectively, the coil of alternating current contactor KM32 with the normally open contact of auxiliary relay KA1 is inserted after establishing ties and is formed the return circuit with main control power supply, the coil of auxiliary relay KA1 is connected the signal output terminal of PLC for detect U looks, V looks, the electric current of W looks respectively. And signal output ends of the current sensors TAA 1-TAA 3 are connected with an analog quantity input end of the PLC and are used for feeding back detected current values. High-voltage channels UA, UB and UC of the power analyzer YQ1 are respectively connected with a U phase, a V phase and a W phase of the power supply system through a main contact of an alternating current contactor KM27, low-voltage channels Ua, Ub and Uc of the power analyzer YQ1 are connected with an N phase of the power supply system through a normally open contact of an auxiliary contact module KM27F, a coil of the alternating current contactor KM27 is connected with a signal output end of the PLC through an intermediate relay KA24, voltage sensors TVV 1-TVV 3 are arranged between the main contact of the alternating current contactor KM27 and the power analyzer YQ1, and the voltage sensors TVV 1-TVV 3 are respectively connected with any two phases of the U phase, the V phase and the W phase of the power supply system and used for detecting three-phase voltage. And the signal output ends of the voltage sensors TVV 1-TVV 3 are connected with an analog quantity input end of the PLC and are used for feeding back the detected voltage value. The high-voltage channel UA of the power analyzer YQ1 and the low-voltage channel UA of the power analyzer YQ1 are respectively connected with the U phase and the V phase of the power supply system through two groups of normally open contacts of the ac contactor KM33, the low-voltage channel UA of the power analyzer YQ1 is connected with the high-voltage channel UB of the power analyzer YQ1 through the other group of normally open contacts of the ac contactor KM33, and the coil of the ac contactor KM33 is connected with the signal output end of the PLC through the intermediate relay KA3, so that the voltage sensor TVV1 bridged between the high-voltage channel UA of the power analyzer YQ1 and the high-voltage channel UB of the power analyzer YQ1 can be used for detecting single-phase voltage.

When the PLC controls the alternating current contactor KM32 and the alternating current contactor KM27 to be switched on, three-phase current and voltage are sampled; when the PLC controls the AC contactor KM32 and the AC contactor KM33 to be switched on, single-phase current and voltage are sampled.

Further, the precise current transformers CT 1-CT 3 respectively comprise six current gears of 5A, 10A, 25A, 50A, 100A and 200A, the six current gears are respectively connected to the U phase, the V phase and the W phase output by the three-phase variable frequency power supply SXY1 through main contacts of alternating current contactors KM 21-KM 26, the alternating current contactors KM 21-KM 26 are respectively connected with six signal output ends of the PLC through intermediate relays KA 18-KA 23, and the on-off of the alternating current contactors KM 21-KM 26 is controlled by controlling the on-off of the intermediate relays KA 18-KA 23 through the PLC, so that the precise current transformers CT 1-CT 3 are switched in gear. Specifically, the first-level windings of the precise current transformers CT1 to CT3 are respectively connected with the U-phase, the V-phase and the W-phase output by the three-phase variable frequency power supply SXY1 through three pairs of normally open contacts of the ac contactor KM21, the second-level windings of the precise current transformers CT1 to CT3 are respectively connected with the U-phase, the V-phase and the W-phase output by the three-phase variable frequency power supply SXY1 through three pairs of normally open contacts of the ac contactor KM22, the third-level windings of the precise current transformers CT1 to CT3 are respectively connected with the U-phase, the V-phase and the W-phase output by the three-phase variable frequency power supply SXY1 through three pairs of normally open contacts of the ac contactor KM23, the fourth-level windings of the precise current transformers CT1 to CT3 are respectively connected with the U-phase, the V-phase and the W-phase output by the three-phase variable frequency power supply SXY1 through three pairs of normally open contacts of the ac contactor KM24, and the fifth-level windings of the precise current transformers CT1 to CT3 are respectively connected with the three- The power supply SXY1 output U looks, V looks, W looks, the accurate current transformer CT1 ~ CT3 sixth grade winding is connected through three pairs of normally open contacts of AC contactor KM26 respectively the U looks, V looks, the W looks of three-phase variable frequency power supply SXY1 output, the coil one-to-one of AC contactor KM21 ~ KM26 is connected and is inserted respectively behind auxiliary relay KA18 ~ KA23 normally open contact main control power supply, auxiliary relay KA18 ~ KA 23's coil is connected respectively the wherein six signal output part of PLC.

Further, the test integration unit comprises a power frequency test module, a three-phase zero-sequence test module, an insulation resistance test module, a three-phase no-load and induction test module, a three-phase load and short-time overload test module, a single-phase no-load test module and a single-phase load test module; the power frequency testing module comprises an alternating current contactor KM34, a power frequency testing transformer BYQ2, a voltage sensor TVV4 and a current sensor TAA4, wherein the power frequency testing transformer BYQ2 is a single-phase transformer, two ends of a primary winding of the power frequency testing transformer BYQ2 are respectively connected with any two phases of a U phase, a V phase and a W phase of the power supply system through two pairs of normally open contacts of the alternating current contactor KM34, the current sensor TAA4 is connected with a secondary winding of the power frequency testing transformer BYQ2 in series, the voltage sensor TVV4 is connected with two ends of a secondary winding of the power frequency testing transformer BYQ2 in parallel, and output ends of the current sensor TAA4 and the voltage sensor TVV4 are respectively connected with an analog input end of the PLC and used for detecting leakage current and secondary voltage of the power frequency testing transformer Q BYQ2 and feeding the; and a normally open contact of the alternating current contactor KM34 is connected with a signal input end of the PLC and used for feeding back the state of the power frequency test. When the PLC controls the AC contactor KM34 to be switched on, the current sensor TAA4 and the voltage sensor TVV4 feed back the detection result of the power frequency test to the PLC.

The three-phase zero-sequence test module comprises an alternating current contactor KM35, a single-phase transformer BYQ1, a vacuum contactor KG5, a vacuum contactor KG51, an alternating current contactor KM37, a movable auxiliary contact module KM37F linked with the alternating current contactor KM37, a voltage sensor TVV1, a zero-sequence current transformer CT4, a power analyzer YQ1, an intermediate relay KA5 and intermediate relays KA 29-KA 30. Two ends of a primary winding of the single-phase transformer BYQ1 are respectively connected with a U phase and a V phase of the power supply system through two groups of normally open contacts of the alternating current contactor KM35, two ends of a secondary winding of the single-phase transformer BYQ1 are respectively connected with a high-voltage channel UA and a low-voltage channel Ua of the power analyzer YQ1 through two groups of normally open contacts of the alternating current contactor KM37, one end of a voltage sensor TVV1 is connected with the high-voltage channel UA of the power analyzer YQ1, the other end of the voltage sensor TVV1 is connected with the low-voltage channel Ua of the power analyzer YQ 5 through the normally open contact of the auxiliary contact module KM37F, one ends of three groups of normally open contacts of the vacuum contactor KG5 are connected with one end of a secondary winding of the single-phase transformer BYQ1 after being short-circuited, and the other ends of three groups, The other end of the secondary winding of the single-phase transformer BYQ1 is connected to the n phase of the transformer to be tested through a group of normally open contacts of the vacuum contactor KG51 and is used for sampling zero-sequence voltage; the zero sequence current transformer CT4 is arranged between the AC contactor KM32 and the high-voltage current channel IA of the power analyzer YQ1, one end of the zero sequence current transformer CT4 is connected with the high-voltage current channel IA of the power analyzer YQ1 through a third group of normally open contacts of the AC contactor KM37, and the other end of the zero sequence current transformer CT4 is connected with the low-voltage current channel Ia of the power analyzer YQ1 and is grounded for sampling zero sequence current. The coil of the vacuum contactor KG5 passes through the intermediate relay KA5, the coil of the vacuum contactor KG51 and the coil of the alternating current contactor KM35 and jointly passes through the intermediate relay KA29 and the coil of the alternating current contactor KM37 and respectively connects with four signal output ends of the PLC through the intermediate relay KA 30. When the PLC controls the vacuum contactor KG5, the vacuum contactor KG51, the alternating current contactor KM35 and the alternating current contactor KM37 to be switched on, three-phase zero sequence test is carried out, and the power analyzer YQ1 processes sampled test data. Normally open contacts of the alternating current contactor KM35 and the alternating current contactor KM37 are respectively connected with a signal input end of the PLC, and the test state is fed back to the PLC.

The insulation resistance testing module comprises intermediate relays KA 25-KA 27, vacuum relays KD 10-KD 20 and an insulation resistance tester YQ2, wherein after one ends of normally open contacts of the vacuum relays KD 11-KD 14 are short-circuited, the normally open contacts of the vacuum relays KD10 are connected to a high-end HI of the insulation resistance tester YQ2, the Low end of the insulation resistance tester YQ2 is grounded, the other ends of the normally open contacts of the vacuum relays KD 11-KD 14 are respectively connected with a phase, a phase and an n phase of a secondary winding of the transformer to be tested, and the short-circuited ends of the normally open contacts of the vacuum relays KD 11-KD 14 are grounded through the normally open contacts of the vacuum relays KD 19. One end of a normally open contact of the vacuum relay KD 16-KD 18 is connected with a high-end HI of the insulation resistance tester YQ2 through the normally open contact of the vacuum relay KD15 after being in short circuit, the other end of the normally open contact of the vacuum relay KD 16-KD 18 is respectively connected with an A phase, a B phase and a C phase of a primary winding of the transformer to be tested, and one end of the normally open contact of the vacuum relay KD 16-KD 18 in short circuit is grounded through a group of normally open contacts of the vacuum relay KD 20. The coils of the vacuum relays KD 11-KD 14, the coils of the vacuum relays KD 16-KD 18 and the coils of the vacuum relays KD20 are connected with a signal output end of the PLC through the intermediate relay KA25, the coils of the vacuum relays KD 11-KD 19 are connected with the signal output end of the PLC through the intermediate relay KA26, and the coils of the vacuum relays KD 10-KD 18 are connected with the signal output end of the PLC through the intermediate relay KA 27. When testing low voltage to high voltage and ground, the PLC controls the intermediate relay KA25 to be switched on, the phase a, the phase B, the phase C and the phase n of the secondary winding of the transformer to be tested are in short circuit with the high-end HI test wire of the insulation resistance tester, and the phase A, the phase B and the phase C of the primary winding of the transformer to be tested are in short circuit with the ground; when testing high voltage to low voltage and ground, the PLC controls the intermediate relay KA26 to be switched on, the a phase, the B phase, the C phase and the n phase of the secondary winding of the transformer to be tested are in short circuit grounding, and the A phase, the B phase and the C phase of the primary winding of the transformer to be tested are in short circuit with a high-end HI test line of the insulation resistance tester; when testing high pressure and low pressure to ground, PLC control intermediate relay KA27 closes, and the a looks, B looks, the C looks of transformer secondary winding and the A looks, B looks, the C looks short circuit insulation resistance tester's high-end HI test wire of transformer primary winding that awaits measuring. The normally open contact of the intermediate relay KA25, the normally open contact of the intermediate relay KA26 and the normally open contact of the intermediate relay KA27 are respectively connected with a signal input end of the PLC and used for feeding back three test states of insulation resistance test.

The three-phase no-load and induction test module comprises the vacuum contactor KG4, the alternating current contactor KM27, the alternating current contactor KM32 and the power analyzer YQ1, and when the vacuum contactor KG4, the alternating current contactor KM27 and the alternating current contactor KM32 are switched on, three-phase no-load and induction test data can be tested through the power analyzer YQ 1.

The three-phase load and short-time overload test module comprises a vacuum contactor KG5, a vacuum contactor KG6, an alternating current contactor KM27, an alternating current contactor KM32 and a power analyzer YQ1, wherein when the vacuum contactor KG5, the vacuum contactor KG6, the alternating current contactor KM27 and the alternating current contactor KM32 are switched on, three-phase load and short-time overload test data can be tested by the power analyzer YQ 1.

The single-phase no-load test module comprises the vacuum contactor KG4, the alternating current contactor KM32, the alternating current contactor KM33 and the power analyzer YQ1, and single-phase no-load test data can be tested through the power analyzer YQ1 when the vacuum contactor KG4, the alternating current contactor KM32 and the alternating current contactor KM33 are switched on; the single-phase load test module comprises the vacuum contactor KG5, the vacuum contactor KG6, the AC contactor KM32 and the AC contactor KM33, and when the vacuum contactor KG5, the vacuum contactor KG6, the AC contactor KM32 and the AC contactor KM33 are closed, single-phase load test data can be tested through the power analyzer YQ 1.

The temperature polling instrument is communicated with the upper computer software through the Ethernet. When no-load and load tests are carried out, the upper computer software extracts real-time temperature data through the communication of the butt joint temperature polling instrument so as to evaluate the temperature rise data of the transformer to be tested.

As shown in fig. 12 to 13, the compensation capacitor unit is disposed between the three-phase variable frequency power control module and the precision current transformers CT1 to CT 3. The compensation capacitor unit comprises an alternating current contactor KM2, an intermediate relay KA2, current transformers TA 1-TA 3, a capacitor compensation controller B1, miniature circuit breakers QF 10-QF 15, alternating current contactors KM 40-KM 45 and three-phase capacitors C20-C25. As shown in fig. 13, a power input end and a power output end of the capacitance compensation controller B1 are respectively connected to the capacitance compensation power supply, a current sampling end of the capacitance compensation controller B1 respectively samples currents of a U phase, a V phase and a W phase of the power supply system as sampling currents through the current transformers TA1 to TA3, a main contact of the ac contactor KM2 is connected in series with the U phase, the V phase and the W phase of the output end of the three-phase frequency conversion source after the current transformers TA1 to TA3 are connected to the output end of the three-phase frequency conversion source, a coil of the ac contactor KM2 is connected to a signal output end of the PLC through the intermediate relay KA2, and a contact of a normally open auxiliary contact module KM2F linked with the ac contactor KM2 is connected to the signal input end of the PLC. The voltage sampling end of the capacitance compensation controller B1 is connected with the main contact of the alternating current contactor KM2 through fuse links 1 RD-3 RD respectively, and the voltage output by the main contact of the alternating current contactor KM2 is used as sampling voltage. One ends of main contacts of the miniature circuit breakers QF 10-QF 15 are respectively connected with an output end of a main contact of the alternating current contactor KM2 in parallel, the other ends of the main contacts of the miniature circuit breakers QF 10-QF 15, the main contacts of the alternating current contactors KM 40-KM 45 and the three-phase capacitors C20-C25 are correspondingly connected in series one by one, and Y-shaped connection points of the three-phase capacitors C20-C25 are respectively grounded; six control signal output ends of the capacitance compensation controller B1, coils of the alternating current contactors KM 40-KM 45 and N phases of the power supply system are respectively connected in series. When the PLC controls the alternating current contactor KM2 to be switched on, the compensation capacitor unit provides reactive compensation for the transformer, and meanwhile, the auxiliary contact module KM2F feeds back the state of the capacitance compensation to the PLC. The capacitance compensation controller B1 calculates according to the sampling voltage, the power factor of the compensation capacitance is calculated by the voltage and current obtained by the capacitance compensation controller B1 through sampling, the switching of the alternating current contactors KM 40-KM 45 is controlled by combining the set upper and lower limit values of the power factor, and the actually input capacitance (the rated voltage 690V of the capacitor of the system) is calculated according to the actual voltage value. Assuming that the real-time voltage is 400V, the actual input capacitance is (400\690)2 × nominal capacitance. Since the calculation is algebraic, and the actual capacitance and current in the inductive loop are vectors, the calculation data is approximate (the margin is considered in the calculation).

In a short-time overload experiment of a transformer of 2500Kva, a three-phase capacitor C26 of 800V/60Kvar should be added separately for compensation of dry-out. As shown in fig. 12, the compensation capacitor unit includes an ac contactor KM46, an intermediate relay KA31, and a three-phase capacitor C26, one end of a main contact of the ac contactor KM46 is connected to the U-phase, the V-phase, and the W-phase of the power system, respectively, the other end of the main contact of the ac contactor KM46 is connected to the three-phase capacitor C26, and a Y-shaped junction of the three-phase capacitor C26 is grounded; the coil of the alternating current contactor KM46 is connected with the signal output end of the PLC through the intermediate relay KA31, and the normally open contact of the alternating current contactor KM46 is connected with the signal input end of the PLC and used for feeding back the compensation state of the three-phase capacitor C26.

As shown in fig. 14-15, the integrated test system further includes a security system, the security system includes emergency stop buttons SB 1-SB 2, an intermediate relay KA0, an ac contactor KM0, a power frequency protection circuit board TAD, an intermediate relay KA45, the normally open contact of the intermediate relay KA0 is connected in series with the coil of the ac contactor KM0 and then connected to the circuit breaker QF1 of the main control power supply, the normally closed contact of the emergency stop button SB1, the normally closed contact of the emergency stop button SB2, the power frequency protection circuit board TAD, the normally closed contact of the intermediate relay KA45, the coil of the intermediate relay KA0 is connected in series and then connected to the circuit breaker QF1 of the main control power supply, a current sampling end of the power frequency protection circuit board TAD is provided with a current transformer TA4, the current transformer TA4 is arranged between the normally open contact of the ac contactor KM34 and the primary winding of the power frequency test transformer BYQ2, when the current transformer TA4 samples that the current of the primary winding of the power frequency test transformer BYQ2 exceeds a preset value, the power frequency protection circuit board TAD is powered off, and the main control power supply is disconnected; as shown in fig. 14, the output terminal 105 and the output terminal 102 of the main control power supply respectively output 220V power through two pairs of moving contact points of the ac contactor KM 0. When the emergency stop button SB1 or the emergency stop button SB2 is pressed or the PLC controls the intermediate relay KA45 to be disconnected, the main control loop is disconnected and the main control power supply is disconnected. And the other group of normally open contacts of the intermediate relay KA0 is connected with the PLC and used for feeding back the emergency stop state of the system to the PLC.

The output terminal 105 and the output terminal 102 of the main control power supply the main control loop. The main control loop comprises normally open contacts of all the intermediate relays controlled by the signal output ends of the PLC, and coils of all the vacuum contactors or the alternating current contactors connected in series with the normally open contacts of all the intermediate relays. After the normally open contact of each intermediate relay is correspondingly connected with the coil of each vacuum contactor or alternating current contactor in series, the normally open contact is respectively connected with the output end 105 and the output end 102 of the main control power supply to form a loop, and a plurality of loops are connected in parallel to form a main control loop.

The security system further comprises a yellow warning lamp, a green warning lamp and a red warning lamp. After the yellow warning lamp, the green warning lamp and the red warning lamp are respectively connected with the normally open contacts of the intermediate relay KA46, the intermediate relay KA47 and the intermediate relay KA40 in series, the output end D103 connected with the power supply of the second DC module and the output end D104 form a loop; the intermediate relay KA46, the intermediate relay KA47 and the intermediate relay KA40 are respectively connected with the signal output end of the PLC, so that the PLC can respectively control a yellow warning lamp, a green warning lamp and a red warning lamp. After the PLC reads the relevant signals of the upper computer, the turn-on and turn-off of the yellow warning lamp, the green warning lamp and the red warning lamp are respectively controlled.

As shown in fig. 14, the comprehensive test system further comprises a cooling system, wherein the cooling system comprises an intermediate relay KA38 and a plurality of parallel cooling fans, a normally open contact of the intermediate relay KA38 is connected in series with the plurality of parallel cooling fans and then is connected to the fan power supply to form a loop, and a coil of the intermediate relay KA38 is connected to a signal output end of the PLC. The host computer sends a signal to the PLC according to the starting of the three-phase frequency conversion source, the PLC outputs +24V to control the KA38 normally open contact to be closed, and the cooling fan is started to cool the comprehensive test system.

In this embodiment, the cabinet body is provided with a person door and two object doors. Correspondingly, as shown in fig. 14, the integrated test system further includes an access control system. The access control system comprises intermediate relays KA 41-KA 44, wherein the intermediate relays KA41 control the opening of a door, the intermediate relays KA42 control the opening of the door, the intermediate relays KA43 control the opening of an object door, and the intermediate relays KA44 control the opening of the object door. Normally open contacts of the intermediate relays KA 41-KA 44 are connected in parallel, and two ends of the normally open contacts of the intermediate relays KA 41-KA 44 are respectively connected to an output end D103 and an output end D104 of the second DC module power supply. The coils of the intermediate relays KA 41-KA 44 are respectively connected with the signal output end of the PLC, and the opening and closing of a man door and an object door can be respectively controlled through the PLC. The entrance guard system further comprises an entrance guard state feedback module, the entrance guard state feedback module comprises intermediate relays KA 80-KA 85, normally open contacts of the intermediate relays KA 80-KA 85 are respectively connected with a signal input end of the PLC, and coils of the intermediate relays KA 80-KA 85 are respectively connected with a limiting switch in series and then are connected with a second DC module power supply to form a loop. The human door and the object door are linked with each limit switch in a one-to-one correspondence mode, after the limit switches are closed, the corresponding intermediate relay coils are powered on, and the states of the human door and the object door are fed back to the PLC. Specifically, as shown in fig. 15, for example, the intermediate relay KA80 is turned on, indicating a closed state of the human door; the intermediate relay KA81 is switched on to show the opening state of a human door; the intermediate relay KA82 is switched on to show the closing state of the object door 1; the intermediate relay KA83 is switched on to show the opening state of the object door 1; the intermediate relay KA84 is switched on to show the closing state of the object door 2; intermediate relay KA85 is closed, indicating that object door 2 is open.

As shown in fig. 15, the integrated test system further includes a display screen on which an emergency stop button SB2 is provided. As shown in fig. 8, the display screen uses the U-phase and N-phase of the power supply system as its operating power supply, and the on/off of the display screen is controlled by the push switch SB 3. A plurality of indicator lights are integrated on the display screen and are powered by the second DC module power supply. The display screen is provided with a power supply indicator HY1, a door channel indicator HY2, an object door channel indicator HY3, a system operation indicator HY4, a system stop indicator HY5, a remote emergency stop indicator SB2 and an emergency stop indicator SB 1. And the power supply indicator HY1 is connected with the output end D103 and the output end D104 of the second DC module power supply to form a loop, and the power supply indicator HY1 indicates the power-on state of the second DC module power supply. The human door channel indicator light HY2 is connected with the normally open contact of the intermediate relay KA80 in series and then connected with the second DC module power supply, and when the normally open contact of the intermediate relay KA80 is closed, the human door channel indicator light HY2 indicates the closed state of the human door. The object door channel indicator light HY3 is connected with the normally open contact of the intermediate relay KA84 in series and then connected with the power supply of the second DC module, and when the normally open contact of the intermediate relay KA84 is closed, the object door channel indicator light HY3 indicates the object door closed state.

The comprehensive test system controls a system operation indicator lamp HY4 and a system stop indicator lamp HY5 through an intermediate relay KA35 to indicate the operation and stop states of the system. The coil of the intermediate relay KA35 is connected with a signal output end of the PLC to form a loop with the first DC module power supply, a normally closed contact of the intermediate relay KA35 is connected with the system stop indicator HY5 in series and then connected with the second DC module power supply to form a loop, a normally open contact of the intermediate relay KA35 is connected with the system operation indicator HY4 in series and then connected with the second DC module power supply to form a loop, and therefore the loop of the system stop indicator HY5 and the loop of the system operation indicator HY4 form an interlocking circuit. When the PLC outputs a control signal to control the coil of the intermediate relay KA35 to be powered on and powered off, the system operation indicator lamp HY4 and the system stop indicator lamp HY5 are controlled to be on and off.

The emergency stop indicator lamp SB1 is connected in series with the normally open contact of the emergency stop button SB1 and then connected to the power supply of the second DC module to form a loop, and when the emergency stop button SB1 is pressed, the emergency stop indicator lamp SB1 is on, and the display system is in an emergency stop state. The emergency stop button SB2 and the distant emergency stop indicator SB2 are both arranged on the display screen, the normally open contact of the emergency stop button SB2 is connected in series with the distant emergency stop indicator SB2 and then connected to the power supply of the second DC module to form a loop, and when the emergency stop button SB2 is pressed on the display screen, the distant emergency stop indicator SB2 is on, and the indicating system is in an emergency stop state.

The integrated intelligent comprehensive test system of the embodiment is aimed at the winding resistance measurement, voltage ratio measurement and connection group label verification, no-load loss and no-load current measurement, short-circuit impedance and load loss measurement, an induction withstand voltage test, insulation resistance measurement, short-time overload capacity measurement (applicable to oil transformation), an external application withstand voltage test, three-phase transformer zero-sequence impedance measurement (applicable to oil transformation) and temperature rise test primary wiring of a power transformer and distribution transformer with the voltage ratio of 2500Kva or below, and the whole test process is automatically completed through a sequence preset by a program. The measuring part is controlled by a high-grade single chip microcomputer in each tester, and test data such as digital display, no-load, short circuit and the like are synchronously sampled by the single chip microcomputer. The method adopts full-computerized operation, simultaneously displays parameters such as three-phase voltage and current, and all test data are displayed on a screen in real time (locked); the data processing adopts an automatic storage mode, and all test data are filled into a corresponding database in real time.

The intelligent comprehensive test system of the embodiment has high integration, test switching automation, accuracy and reliability, so that the test efficiency is greatly improved, the manual misoperation rate is greatly reduced, the structure of the test system is greatly simplified, and the use is more convenient and efficient.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. The transformer integrated intelligent comprehensive test system is characterized by comprising a cabinet body, a power supply system, a main control loop, a PLC, a test integration unit and a compensation capacitor unit, wherein the power supply system, the main control loop, the PLC, the test integration unit and the compensation capacitor unit are arranged in the cabinet body; the PLC is in signal connection with the main control loop and is used for outputting a PLC control signal and feeding back an action signal of the main control loop; the main control loop is in signal connection with the test integration unit and is used for controlling each tester in the test integration unit to respectively perform test switching on the transformer to be tested, and the compensation capacitor unit provides reactive compensation for the power supply system.

2. The transformer integrated intelligent comprehensive test system according to claim 1, wherein a single-phase control power supply unit is arranged in the power supply system, and the control power supply unit takes any one of a U phase, a V phase and a W phase of the power supply system as an L phase; the control power supply unit comprises a main control power supply, a first DC module power supply, a second DC module power supply, an instrument power supply, a fan power supply and a capacitance compensation power supply which are connected to the L-phase and the N-phase through circuit breakers QF 1-QF 6 respectively, the main control power supply is used for supplying power to the main control loop, the output end of the first DC module power supply is used for supplying power to the PLC, the second DC module power supply is used for supplying power to other direct-current low-voltage modules of the comprehensive test system, the instrument power supply is used for supplying power to the test integration unit, and the capacitance compensation power supply is used for supplying power to the compensation capacitance unit.

3. The transformer integrated intelligent comprehensive test system of claim 2, wherein a vacuum contactor KG4 and a vacuum contactor KG6 are arranged between the power supply system and the transformer to be tested, an intermediate relay KA4 and an intermediate relay KA6 are respectively arranged between the vacuum contactor KG4 and the vacuum contactor KG6 and the PLC, a phase a, a phase B and a phase C of the secondary winding of the transformer to be tested are respectively connected to a phase U, a phase V and a phase W of the power supply system through main contacts of the vacuum contactor KG4, and a phase a, a phase B and a phase C of the primary winding of the transformer to be tested are respectively connected to a phase U, a phase V and a phase W of the power supply system through main contacts of the vacuum contactor KG 6; vacuum contactor KG 4's coil and auxiliary relay KA 4's normally open contact establish ties after with main control power supply forms the return circuit vacuum contactor KG 6's coil and auxiliary relay KA 6's normally open contact establish ties after with main control power supply forms the return circuit, auxiliary relay KA 4's coil auxiliary relay KA 6's coil is connected respectively PLC's wherein two signal output part.

4. The transformer integrated intelligent comprehensive testing system of claim 3, wherein the testing integration unit comprises a direct-current resistance and transformation ratio testing module, and the direct-current resistance and transformation ratio testing module comprises a direct-current resistance tester, a transformation ratio tester, an intermediate relay KA8, vacuum relays KD 1-KD 3, an alternating-current contactor KM-Rab/KM-Rbc/KM-Rca/KM-RCA/KM-Bb and auxiliary contact modules KMF-Rab/KMF-Rbc/KM-Rca/KM-RAB/KM-RBC/KM-RCA/KM-Bb which are linked with the alternating-current contactor KM-Rab/KM/KMF-Rbc/KMF-Rca/KMF-RAB/KMF-RCA/KMF-Bb in a one-to one-one correspondence manner; the PLC is used as the signal input of a coil of the intermediate relay KA8 and is connected with a coil terminal of the intermediate relay KA8, one end of a normally open contact of the intermediate relay KA8 is connected with the positive electrode of the first DC module power supply, the other end of the normally open contact of the intermediate relay KA8 is connected with one end of a coil of the vacuum relay KD1, a coil of the vacuum relay KD2 and one end of a coil of the vacuum relay KD3 in parallel, and the other ends of the coil of the vacuum relay KD1, the coil of the vacuum relay KD2 and the coil of the vacuum relay KD3 are connected with the negative electrode of the first DC module power supply; one end of a normally open contact of the vacuum relay KD1 is connected with a common node of a main contact of the vacuum contactor KG4 and a phase of a secondary winding a of the transformer to be tested, one end of a normally open contact of the vacuum relay KD2 is connected with a common node of a main contact of the vacuum contactor KG4 and a phase of a secondary winding b of the transformer to be tested, and one end of a normally open contact of the vacuum relay KD3 is connected with a common node of a main contact of the vacuum contactor KG4 and a phase of a secondary winding c of the transformer to be tested; the other end of a normally open contact of the vacuum relay KD1 is connected with the low-voltage side I + end of the direct-current resistance tester through a first pair of normally open contacts of the alternating-current contactor KM-Rab, the other end of a normally open contact of the vacuum relay KD2 is connected with the first pair of normally open contacts of the alternating-current contactor KM-Rbc, and the other end of a normally open contact of the vacuum relay KD3 is connected with the low-voltage side I + end of the direct-current resistance tester through the first pair of normally open contacts of the alternating-current contactor; the other end of the normally open contact of the vacuum relay KD1 is connected with the low-voltage side I-end of the direct-current resistance tester through the second pair of normally open contacts of the alternating-current contactor KM-Rca, the other end of the normally open contact of the vacuum relay KD2 is connected with the second pair of normally open contacts of the alternating-current contactor KM-Rab, and the other end of the normally open contact of the vacuum relay KD3 is connected with the low-voltage side I-end of the direct-current resistance tester through the second pair of normally open contacts of the alternating-current contactor; the other end of a normally open contact of the vacuum relay KD1 is connected with a low-voltage side V + end of the direct-current resistance tester through a third pair of normally open contacts of the alternating-current contactor KM-Rab, the other end of a normally open contact of the vacuum relay KD2 is connected with a third pair of normally open contacts of the alternating-current contactor KM-Rbc, and the other end of a normally open contact of the vacuum relay KD3 is connected with a low-voltage side V + end of the direct-current resistance tester through a third pair of normally open contacts of the alternating-current contactor KM-; the other end of the normally open contact of the vacuum relay KD1 is connected with the low-voltage side V-end of the direct-current resistance tester through the normally open contact of the auxiliary contact module KMF-Rca, the other end of the normally open contact of the vacuum relay KD2 is connected with the normally open contact of the auxiliary contact module KMF-Rab, and the other end of the normally open contact of the vacuum relay KD3 is connected with the low-voltage side V-end of the direct-current resistance tester through the normally open contact of the auxiliary contact module KMF-Rbc; the other end of the normally open contact of the vacuum relay KD1, the other end of the normally open contact of the vacuum relay KD2 and the other end of the normally open contact of the vacuum relay KD3 are respectively connected with the low-voltage side a end, the low-voltage side b end and the low-voltage side c end of the transformation ratio tester through three pairs of normally open contacts of the alternating current contactor KM-Bb; a common node of a U phase of the power supply system and a common node of the vacuum contactor KG6 is connected with a high-voltage side I + end of the direct-current resistance tester through a first pair of normally open contacts of the alternating-current contactor KM-RAB, a V phase of the power supply system and a common node of the vacuum contactor KG6 through a first pair of normally open contacts of the alternating-current contactor KM-RBC, a W phase of the power supply system and a common node of the vacuum contactor KG6 through a first pair of normally open contacts of the alternating-current contactor KM-RCA; the common node of the U phase of the power supply system and the vacuum contactor KG6 is connected with the high-voltage side I-end of the direct-current resistance tester through the second pair of normally open contacts of the alternating-current contactor KM-RCA, the common node of the V phase of the power supply system and the vacuum contactor KG6 through the second pair of normally open contacts of the alternating-current contactor KM-RAB, and the common node of the W phase of the power supply system and the vacuum contactor KG6 through the second pair of normally open contacts of the alternating-current contactor KM-RBC; the common node of the U phase of the power supply system and the vacuum contactor KG6 is commonly connected with the high-voltage side V + end of the direct-current resistance tester through the third pair of normally open contacts of the alternating-current contactor KM-RAB, the common node of the V phase of the power supply system and the vacuum contactor KG6 through the third pair of normally open contacts of the alternating-current contactor KM-RBC, and the common node of the W phase of the power supply system and the vacuum contactor KG6 through the third pair of normally open contacts of the alternating-current contactor KM-RCA; and the U phase of the power supply system and the common node of the vacuum contactor KG6, the V phase of the power supply system and the common node of the vacuum contactor KG6, and the W phase of the power supply system and the common node of the vacuum contactor KG6 are also connected with the high-voltage side A end, the high-voltage side B end and the high-voltage side C end of the transformation ratio tester through three pairs of normally open contacts of the auxiliary contact module KMF-Bb respectively.

5. The integrated intelligent comprehensive test system for the transformer according to claim 3, wherein the test integration unit comprises a three-phase variable frequency power supply control module, the three-phase variable frequency power supply control module comprises a three-phase variable frequency power supply SXY1, intermediate relays KA 33-KA 34 and intermediate relays KA 36-KA 37, a power input end of the three-phase variable frequency power supply SXY1 is connected with a U phase, a V phase and a W phase of the power system, and a power output end of the three-phase variable frequency power supply SXY1 outputs a regulated three-phase power supply; the control power supply input end of the three-phase variable frequency power supply SXY1 is connected with the positive electrode of the first DC module power supply; a feedback signal output end of the three-phase variable frequency power supply SXY1 is connected with a signal input end of the PLC; the 50Hz control end of the three-phase variable frequency power supply SXY1 is connected with the normally open contact of the intermediate relay KA33 in series, and the coil of the intermediate relay KA33 is connected with the signal output end of the PLC in series; the 150Hz control end of the three-phase variable frequency power supply SXY1 is connected with the normally open contact of the intermediate relay KA34 in series, and the coil of the intermediate relay KA34 is connected with the signal output end of the PLC in series; the start-stop control end of the three-phase variable frequency power supply SXY1 is connected in series with the normally open contact of the intermediate relay KA36, and the coil of the intermediate relay KA36 is connected in series with the signal output end of the PLC; the output control end of the three-phase variable frequency power supply SXY1 is connected in series with the normally open contact of the intermediate relay KA37, and the coil of the intermediate relay KA37 is connected in series with the signal output end of the PLC; and voltage-regulating return-to-zero control ends DA-DA + of the three-phase variable frequency power supply SXY1 are respectively connected with an analog quantity output end of the PLC.

6. The transformer integrated intelligent comprehensive test system of claim 5, wherein the test integrated unit comprises a current-voltage sampling module, the current-voltage sampling module comprises precision current transformers CT 1-CT 3, current sensors TAA 1-TAA 3, voltage sensors TVV 1-TVV 3, a power analyzer YQ1, an AC contactor KM32, an AC contactor KM33, an AC contactor KM27, an auxiliary contact module KM27F linked with the AC contactor KM27, an intermediate relay KA1, an intermediate relay KA3 and an intermediate relay KA24, primary coils of the precision current transformers CT 1-CT 3 are respectively connected in series with a U phase, a V phase and a W phase output by the three-phase variable frequency power supply SXY1, one ends of secondary coils of the precision current transformers CT 1-CT 3 are respectively connected with input ends of the current sensors TAA 1-TAA 3 through main contacts of the AC contactor KM32, the other ends of secondary coils of the precise current transformers CT 1-CT 3 are grounded, the output ends of the current sensors TAA 1-TAA 3 are respectively connected with high-voltage current channels IA, IB and IC of the power analyzer YQ1, low-voltage current channels Ia, Ib and IC of the power analyzer YQ1 are respectively grounded, a coil of the alternating current contactor KM32 is connected with a normally open contact of the intermediate relay KA1 in series and then connected with the main control power supply to form a loop, and a coil of the intermediate relay KA1 is connected with a signal output end of the PLC; high-voltage channels UA, UB and UC of the power analyzer YQ1 are respectively connected to a U phase, a V phase and a W phase of the power supply system through a main contact of the ac contactor KM27, low-voltage channels UA, UB and UC of the power analyzer YQ1 are connected to an N phase of the power supply system through a normally open contact of the auxiliary contact module KM27F, a coil of the ac contactor KM27 is connected to a signal output terminal of the PLC through the intermediate relay KA24, the voltage sensors TVV1 to TVV3 are disposed between the main contact of the ac contactor KM27 and the power analyzer YQ1, and the voltage sensors TVV1 to TVV3 are respectively connected to any two phases of the U phase, the V phase and the W phase of the power supply system; the high-voltage channel UA of the power analyzer YQ1 and the low-voltage channel UA of the power analyzer YQ1 are respectively connected with the U phase and the V phase of the power supply system through two groups of normally open contacts of the ac contactor KM33, the low-voltage channel UA of the power analyzer YQ1 is connected with the high-voltage channel UB of the power analyzer YQ1 through the other group of normally open contacts of the ac contactor KM33, and the coil of the ac contactor KM33 is connected with the signal output end of the PLC through the intermediate relay KA 3.

7. The transformer integrated intelligent comprehensive test system according to claim 6, wherein the precision current transformers CT 1-CT 3 respectively comprise a plurality of current gears, the plurality of gears are respectively connected to the U phase, the V phase and the W phase output by the three-phase variable frequency power supply SXY1 through main contacts of alternating current contactors KM 21-KM 26, and the alternating current contactors KM 21-KM 26 are respectively connected with six signal output ends of the PLC through intermediate relays KA 18-KA 23; the first-level windings of the precise current transformers CT 1-CT 3 are respectively connected with the U phase, the V phase and the W phase output by the three-phase variable frequency power supply SXY1 through three pairs of normally open contacts of the alternating current contactor KM21, the second-level windings of the precise current transformers CT 1-CT 3 are respectively connected with the U phase, the V phase and the W phase output by the three-phase variable frequency power supply SXY1 through three pairs of normally open contacts of the alternating current contactor KM22, the third-level windings of the precise current transformers CT 1-CT 3 are respectively connected with the U phase, the V phase and the W phase output by the three-phase variable frequency power supply SXY1 through three pairs of normally open contacts of the alternating current contactor KM23, the fourth-level windings of the precise current transformers CT 1-CT 3 are respectively connected with the U phase, the V phase and the W phase output by the three-phase variable frequency power supply SXY1 through three pairs of normally open contacts of the alternating current contactor KM24, and the fifth-level windings of the precise current transformers CT 6-CT 3 are respectively connected with the three-phase variable frequency power supply KM 73727 The output U-phase, V-phase and W-phase windings of the precise current transformers CT 1-CT 3 are connected with the U-phase, V-phase and W-phase output by the three-phase variable frequency power supply SXY1 through three pairs of normally open contacts of an alternating current contactor KM26, coils of the alternating current contactors KM 21-KM 26 are connected with normally open contacts of the intermediate relays KA 18-KA 23 in a one-to-one correspondence mode and then are connected with the main control power supply, and coils of the intermediate relays KA 18-KA 23 are connected with six signal output ends of the PLC respectively.

8. The integrated intelligent comprehensive test system for the transformer according to claim 7, wherein the test integration unit comprises a power frequency test module, a three-phase zero-sequence test module, an insulation resistance test module, a three-phase no-load and induction test module, a three-phase load/temperature rise and short-time overload test module, a single-phase no-load test module and a single-phase load test module; the power frequency testing module comprises an alternating current contactor KM34, a power frequency testing transformer BYQ2, a voltage sensor TVV4 and a current sensor TAA4, wherein the power frequency testing transformer BYQ2 is a single-phase transformer, two ends of a primary winding of the power frequency testing transformer BYQ2 are respectively connected with any two phases of a U phase, a V phase and a W phase of the power supply system through two pairs of normally open contacts of the alternating current contactor KM34, the current sensor TAA4 is connected with a secondary winding of the power frequency testing transformer BYQ2 in series, the voltage sensor TVV4 is connected with two ends of a secondary winding of the power frequency testing transformer BYQ2 in parallel, and output ends of the current sensor TAA4 and the voltage sensor TVV4 are respectively connected with an analog quantity input end of the PLC; the three-phase zero-sequence test module comprises an alternating current contactor KM35, a single-phase transformer BYQ1, a vacuum contactor KG5, a vacuum contactor 51, an alternating current contactor KM37, an auxiliary contact module KM37F linked with the alternating current contactor KM37, a voltage sensor TVV1, a zero-sequence current transformer CT4, a power analyzer YQ1, an intermediate relay KA5 and intermediate relays KA 29-KA 30, two ends of a primary winding of the single-phase transformer BYQ1 are respectively connected with a U phase and a V phase of the power system through two groups of normally open contacts of the alternating current contactor KM35, two ends of a secondary winding of the single-phase transformer Q BYQ1 are respectively connected with a high-voltage channel UA and a low-voltage channel Ua of the power analyzer YQ1 through two groups of contacts of the alternating current contactor KM37, one end of the voltage sensor TVV1 is connected with a high-voltage channel UA of the power analyzer YQ1, and the other end of the low-voltage channel 1 of the power analyzer through contacts of the auxiliary contact module KM In a Ua mode, one end of three groups of normally open contacts of the vacuum contactor KG5 is connected with one end of a secondary winding of the single-phase transformer BYQ1 after being in short circuit, the other end of the three groups of normally open contacts of the vacuum contactor KG5 are respectively connected with an a phase, a b phase and a c phase of the secondary winding of the transformer to be tested, and the other end of the secondary winding of the single-phase transformer BYQ1 is connected with an n phase of the transformer to be tested through one group of normally open contacts of the vacuum contactor KG 51; the zero-sequence current transformer CT4 is disposed between the ac contactor KM32 and the high-voltage current channel IA of the power analyzer YQ1, one end of the zero-sequence current transformer CT4 is connected to the high-voltage current channel IA of the power analyzer YQ1 through a third set of normally open contacts of the ac contactor KM37, the other end of the zero-sequence current transformer CT4 is connected to the low-voltage current channel IA of the power analyzer YQ1 and grounded, a coil of the vacuum contactor KG 539 5 is connected to four signal output ends of the PLC through the intermediate relay KA29, a coil of the ac contactor KM37 and the intermediate relay KA30, respectively, together through the intermediate relay KA5, a coil of the vacuum contactor KG51 and a coil of the ac contactor KM 35; the insulation resistance test module comprises intermediate relays KA 25-KA 27, vacuum relays KD 10-KD 20 and an insulation resistance tester YQ2, wherein one ends of normally open contacts of the vacuum relays KD 11-KD 14 are connected with a high-end HI of the insulation resistance tester YQ2 through normally open contacts of the vacuum relays KD10 after being short-circuited, the Low end of the insulation resistance tester YQ2 is grounded, the other ends of the normally open contacts of the vacuum relays KD 11-KD 14 are respectively connected with a-phase, b-phase, c-phase and n-phase of a secondary winding of the transformer to be tested, one ends of the normally open contacts of the vacuum relays KD 11-KD 14 after being short-circuited are connected with the high end of the insulation resistance tester YQ2 through normally open contacts of the vacuum relays KD19, one ends of the normally open contacts of the vacuum relays KD 16-KD 18 are connected with the high end of the insulation resistance tester YQ2 through normally open contacts of the vacuum relays KD15 after being short-circuited, and the other ends of the normally open contacts of the vacuum relays KD 16-18, Phase B and phase C, wherein one short-circuited normally-open contact ends of vacuum relays KD 16-KD 18 are grounded through a group of normally-open contacts of a vacuum relay KD20, coils of the vacuum relays KD 11-KD 14, coils of the vacuum relays KD 16-KD 18 and coils of the vacuum relays KD20 are connected with a signal output end of the PLC through an intermediate relay KA25, coils of the vacuum relays KD 11-KD 19 are connected with the signal output end of the PLC through the intermediate relay KA26, and coils of the vacuum relays KD 10-KD 18 are connected with the signal output end of the PLC through the intermediate relay KA 27; the three-phase no-load and induction test module comprises the vacuum contactor KG4, the alternating current contactor KM27, the alternating current contactor KM32 and the power analyzer YQ1, and when the vacuum contactor KG4, the alternating current contactor KM27 and the alternating current contactor KM32 are switched on, three-phase no-load and induction test data can be tested through the power analyzer YQ 1; the three-phase load, temperature rise and short-time overload test module comprises a vacuum contactor KG5, a vacuum contactor KG6, an alternating current contactor KM27, an alternating current contactor KM32 and a power analyzer YQ1, and when the vacuum contactor KG5, the vacuum contactor KG6, the alternating current contactor KM27 and the alternating current contactor KM32 are switched on, three-phase load, temperature rise and short-time overload test data can be tested through the power analyzer YQ 1; the single-phase no-load test module comprises the vacuum contactor KG4, the alternating current contactor KM32, the alternating current contactor KM33 and the power analyzer YQ1, and single-phase no-load test data can be tested through the power analyzer YQ1 when the vacuum contactor KG4, the alternating current contactor KM32 and the alternating current contactor KM33 are switched on; the single-phase load test module comprises the vacuum contactor KG5, the vacuum contactor KG6, the AC contactor KM32 and the AC contactor KM33, and when the vacuum contactor KG5, the vacuum contactor KG6, the AC contactor KM32 and the AC contactor KM33 are closed, single-phase load test data can be tested through the power analyzer YQ 1.

9. The transformer integrated intelligent comprehensive test system according to claim 2, wherein the compensation capacitor unit is arranged between the three-phase variable frequency power supply control module and the precision current transformers CT 1-CT 3; the compensation capacitor unit comprises an alternating current contactor KM2, an intermediate relay KA2, current transformers TA 1-TA 3, a capacitance compensation controller B1, miniature circuit breakers QF 10-QF 15, alternating current contactors KM 40-KM 45 and three-phase capacitors C20-C25, wherein a power supply input end and a power supply output end of the capacitance compensation controller B1 are respectively connected with the capacitance compensation power supply, a current sampling end of the capacitance compensation controller B1 respectively samples U-phase, V-phase and W-phase currents of the power supply system as sampling currents through the current transformers TA 1-TA 3, a main contact of the alternating current contactor KM2 is connected with the U-phase, V-phase and W-phase of the output end of the three-phase change frequency source after the current transformers TA 1-TA 3 are connected with the output end of the three-phase change frequency source, a coil of the alternating current contactor KM2 is connected with the signal output end of the PLC through the intermediate relay 2, voltage sampling ends of the capacitance compensation controller B1 respectively sample voltages behind main contacts of the alternating current contactor KM2 to serve as sampling voltages, one ends of the main contacts of the miniature circuit breakers QF 10-QF 15 are respectively connected into the main contacts of the alternating current contactor KM2 in parallel, the other ends of the main contacts of the miniature circuit breakers QF 10-QF 15, the main contacts of the alternating current contactors KM 40-KM 45 and the three-phase capacitors C20-C25 are correspondingly connected in series one by one, and Y-shaped connection points of the three-phase capacitors C20-C25 are respectively grounded; six control signal output ends of the capacitance compensation controller B1, coils of the alternating current contactors KM 40-KM 45 and N phases of the power supply system are respectively connected in series.

10. The transformer integrated intelligent comprehensive test system according to claim 2, wherein the compensation capacitor unit comprises an ac contactor KM46, an intermediate relay KA31 and a three-phase capacitor C26, one end of a main contact of the ac contactor KM46 is connected to the U-phase, the V-phase and the W-phase of the power supply system, the other end of the main contact of the ac contactor KM46 is connected to the three-phase capacitor C26, and a Y-shaped junction of the three-phase capacitor C26 is grounded; the coil of the AC contactor KM46 is connected with the signal output end of the PLC through the intermediate relay KA 31.