Transformer test wiring converter

Abstract

The invention discloses a transformer test wiring converter which comprises a box cover, a box body, a mounting panel, a low-voltage end module, a medium-voltage end module, a high-voltage end module, an excitation / response end module, an intelligent display screen, a power switch, a relay module, a data output module and a power module. The low-voltage end module, the medium-voltage end module, the high-voltage end module, the excitation / response end module, the intelligent display screen and the power switch are respectively arranged on the mounting panel; the relay module, the power supply module and the data output module are respectively arranged below the mounting panel; the low-voltage end module, the medium-voltage end module, the high-voltage end module and the excitation / response end module are electrically connected with the data output module through the relay module. And the data output module is electrically connected with the intelligent display screen. By optimizing the wiring structure and mode, the wiring efficiency is remarkably improved, the problems of climbing and frequent operation in a traditional transformer test wiring mode are solved, and potential risks in operation are reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of transformer test equipment, and particularly relates to a transformer test wiring converter. Background Art

[0002] When conducting transformer tests, testers need to clamp the test wiring pliers on the instrument to the corresponding test points on the transformer for testing. For test items of the same voltage level, the wiring of different phase windings must be changed to complete the test of this voltage level. For windings of different voltage levels, after each test is completed, different voltage level test points must be connected. Testers often need to climb onto the transformer repeatedly to change the wiring in order to complete the test tasks.

[0003] During the electrical test of large transformers, according to the regulations, after the test lines are connected, personnel should evacuate from the main transformer body. However, frequent replacement of the wiring requires personnel to stay on the main transformer for a long time to work, which is prone to danger. Frequent replacement of the wiring during high-altitude operations is likely to lead to wiring errors, which will increase the test duration at least and damage the equipment and cause personal injuries at worst. Frequent replacement of the test wiring requires up-and-down transmission and climbing up and down, with low work efficiency, and there are significant safety hazards during high-altitude operations. For this reason, many solutions have also been proposed.

[0004] For example: Chinese Patent Application No. 202221596090.1 discloses a multi-functional transformer parameter testing device, which includes a core control platform, a power module, a relay switching module, a wiring terminal module, a communication interface module integrated in a device cabinet, and a DC resistance measurement module, an insulation resistance measurement module, a turns ratio measurement module, an on-load tap-changer test module, a dielectric loss measurement module, a short-circuit impedance measurement module, and a winding deformation test module for detecting different test data of the transformer. Each functional test module is respectively connected to the power module through the relay switching module, the transformer under test is respectively connected to each functional test module through the wiring terminal module, the core control platform is respectively connected to each functional test module through the communication interface module, and the core control platform is connected to the relay switching module through the communication interface module; this device can effectively shorten the time for transformer test and maintenance, reduce the labor intensity of maintenance staff, and improve the work efficiency of maintenance personnel.

[0005] For another example, Chinese Patent Application No. 202022342621.1 discloses a new type of integrated wiring device for transformers. By pressing a button, different transformer test items can be selected. The button is electrically connected to an MCU single-chip microcomputer, and the MCU single-chip microcomputer is electrically connected to an audible and visual alarm. The button sends a signal to the MCU single-chip microcomputer. This device is also provided with a terminal for connecting a tester and a terminal for connecting a transformer. A signal detection module is used to detect whether a test wire is connected to the terminal for connecting the tester. The signal detection module is electrically connected to the MCU single-chip microcomputer, and the MCU single-chip microcomputer is electrically connected to a relay control module. This device enables testers to complete most test items with only one connection of the main transformer bushing, eliminating the safety hazard of testers falling from a height. It can automatically detect whether the on-site wiring of each test item of the transformer is correct, avoiding problems such as electric shock to personnel and equipment damage caused by incorrect test wiring, and improving the working efficiency of the electrical test site.

[0006] For another example, Chinese Patent Application No. 201921737296.X discloses a transformer test auxiliary wiring device powered by a power supply. A display screen is provided on the front of the device, and a wiring panel is provided on the back of the device. A number of wiring interfaces are provided on the wiring panel, and the wiring interfaces are connected to a switching circuit, and the switching circuit is also connected to a central controller, and the central controller is also connected to the display screen; this device can assist in the test wiring connection between the instrument and the transformer, and all wiring changes can be achieved through this wiring device, and the wire-changing time can be controlled within 5 seconds, which is convenient and fast. Summary of the Invention

[0007] The object of the present invention is to provide a transformer test wiring converter with a simple structure, convenient to carry, safe and reliable. By optimizing the wiring structure and method, the present invention significantly improves the wiring efficiency, solves the problems of climbing heights and frequency in the traditional transformer test wiring method, and reduces the potential risks in the operation; at the same time, through the integrated design, the operator can more quickly and conveniently complete the connection of the test wires, greatly improving the working efficiency, enhancing the operation safety, ensuring the accuracy and reliability of the transformer test data, and escorting the safe operation of the transformer.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions: A transformer test wiring converter, comprising a box cover, a box body, an installation panel, a low-voltage terminal module, a medium-voltage terminal module, a high-voltage terminal module, an excitation / response terminal module, an intelligent display screen, a power switch, a relay module, a power module and a data output module; the installation panel is arranged on the upper part of the box body; the low-voltage terminal module, the medium-voltage terminal module, the high-voltage terminal module, the excitation / response terminal module, the intelligent display screen and the power switch are respectively arranged on the installation panel; the relay module, the power module and the data output module are respectively arranged below the installation panel; the low-voltage terminal module, the medium-voltage terminal module, the high-voltage terminal module and the excitation / response terminal module are respectively electrically connected to the data output module through the relay module; the data output module is electrically connected to the intelligent display screen.

[0009] In the present invention, the installation panel adopts an insulating panel and uses a punching technology to meet the installation of various functional plug-ins. The intelligent display screen is the device operation panel and is internally provided with a PLC control module, which can automatically switch various insulation test items according to the preset test output requirements. Through actuators such as the relay module, various test circuits can be quickly switched. There are also indicator lights of different colors on the intelligent display screen. The indicator lights display the connection status of the corresponding wiring. The green light indicates good contact, and the red light indicates poor contact, which is convenient for testers to better test. The relay module is composed of multiple relays and serves as the switching switch of the device, playing a role in gear adjustment. Different gears can be selected according to different insulation test items, eliminating the need for multiple wire replacements and avoiding multiple operations, greatly saving time. The power switch is the control element for turning on and off the overall power supply of the device. The present invention further illustrates that a charging port is also provided on the installation panel; the charging port is electrically connected to the power module. The power module of the present invention is powered by a lithium battery, which is convenient for use without an external power supply.

[0010] The present invention further illustrates that a grounding post is also provided on the installation panel.

[0011] The present invention further illustrates that the low-voltage terminal module, the medium-voltage terminal module, the high-voltage terminal module and the excitation / response terminal module are arranged in sequence from top to bottom on the left side of the installation panel; the intelligent display screen is arranged at the upper right side position of the installation panel; the power switch is arranged at the lower right side position of the installation panel.

[0012] The present invention further illustrates that the low-voltage terminal module is composed of an insulating board and several low-voltage wiring terminals; the medium-voltage terminal module is composed of an insulating board and several medium-voltage wiring terminals; the high-voltage terminal module is composed of an insulating board and several high-voltage wiring terminals; the excitation / response terminal module is composed of an insulating board, an excitation wiring terminal and three response wiring terminals.

[0013] The terminal posts on the low-voltage module, medium-voltage module, high-voltage module, and excitation / response module of the present invention can be marked with different colors according to actual needs or conventional operations in the art, which facilitates the testers to complete the wiring quickly and accurately.

[0014] The present invention further illustrates that the rear side of the box cover is hinged to the upper edge of the rear panel of the box body, and the front side of the box cover is connected to the upper edge of the front panel of the box body through a snap component.

[0015] The working principle (usage method) of the present invention: Before the test starts, firmly clamp all the test line pliers at the transformer test points, insert the pins into this conversion device, and the shielded pins are reliably grounded. When this device is not powered on, all the terminal blocks are independent of each other and not connected. After power is turned on, the detection points of the instrument are switched through the internal control of the device to meet the requirements of various tests. This conversion device has the functions of ① winding frequency response test of the transformer, ② short-circuit impedance test of the transformer (<20A, the regulation requires ≥5A), ③ on-load switching process program and time test of the transformer, ④ DC resistance test of the transformer winding, and ⑤ transformation ratio test of the transformer.

[0016] ① Winding frequency response test of the transformer (1) Measure the high-voltage winding deformation test (the high-voltage winding connection is Yo).

[0017] When measuring the A-phase winding deformation test, the red input terminal (excitation end) on the device is connected to the high-voltage black terminals (0) and (01), and the yellow terminal (response end) on the device is connected.

[0018] When measuring the B-phase winding deformation test, the red input terminal (excitation end) on the device is connected to the high-voltage black terminals (0) and (01), and the green terminal (response end) on the device is connected.

[0019] When measuring the C-phase winding deformation test, the red input terminal (excitation end) on the device is connected to the high-voltage black terminals (0) and (01), and the red terminal (response end) on the device is connected.

[0020] (2) Measure the medium-voltage winding deformation test (the medium-voltage winding connection is Yo).

[0021] When measuring the Am-phase winding deformation test, the red input terminal (excitation end) on the device is connected to the medium-voltage black terminal (0) and the high-voltage black terminal (01), and the yellow terminal (response end) on the device is connected.

[0022] When measuring the winding deformation test of the Bm phase, the red input terminal (excitation terminal) on the device is connected to the medium-voltage black terminal (0) and the high-voltage black terminal (O1), and the green terminal (response terminal) on the device is connected.

[0023] When measuring the winding deformation test of the Cm phase, the red input terminal (excitation terminal) on the device is connected to the medium-voltage black terminal (0) and the high-voltage black terminal (O1), and the red terminal (response terminal) on the device is connected.

[0024] (3)Measure the low-voltage winding deformation test (the low-voltage winding connection is Yo).

[0025] When measuring the winding deformation test of the a phase, the red input terminal (excitation terminal) on the device is connected to the low-voltage black terminal (O) and the low-voltage black terminal (01), and the low-voltage yellow terminal (response terminal) on the device is connected.

[0026] When measuring the winding deformation test of the b phase, the red input terminal (excitation terminal) on the device is connected to the low-voltage black terminal (O) and the low-voltage black terminal (01), and the low-voltage green terminal (response terminal) on the device is connected When measuring the winding deformation test of the c phase, the red input terminal (excitation terminal) on the device is connected to the low-voltage black terminal (O) and the low-voltage black terminal (O1), and the low-voltage red terminal (response terminal) on the device is connected (4)Measure the low-voltage winding deformation test (the low-voltage winding connection is △).

[0027] When measuring the winding deformation test of the ab phase, the red input terminal (excitation terminal) on the device is connected to the low-voltage yellow terminal (a), and the black input terminal (response terminal) on the device is connected to the low-voltage terminal green (b).

[0028] When measuring the winding deformation test of the bc phase, the red input terminal (excitation terminal) on the device is connected to the low-voltage green terminal (b), and the black input terminal (response terminal) on the device is connected to the low-voltage terminal red (c).

[0029] When measuring the winding deformation test of the ca phase, the red input terminal (excitation terminal) on the device is connected to the low-voltage red terminal (c), and the black input terminal (response terminal) on the device is connected to the low-voltage terminal yellow (a).

[0030] ②Transformer short-circuit impedance test (<10A) (1)Measure the high-voltage to medium-voltage short-circuit impedance test First, connect the high-voltage ABC of the short-circuit impedance tester to the high-voltage ABC terminals of the device. Secondly, use the special short-circuit wire of the short-circuit impedance tester to short-circuit the medium-voltage AmBmCm clamp on the transformer. Finally, turn on the short-circuit impedance tester, select the test current of <20A (the regulation requires ≮5A), and conduct the high-to-medium short-circuit impedance test.

[0031] (2)Measurement of short-circuit impedance from high voltage to low voltage First, connect the high-voltage ABC of the short-circuit impedance tester to the high-voltage ABC terminals of the device. Second, use the special short-circuit wire of the short-circuit impedance tester to short-circuit the low-voltage abc clamps on the transformer. Finally, turn on the short-circuit impedance tester, select a test current of <20 A (the regulation requires ≥5 A), and conduct the measurement of short-circuit impedance from high voltage to low voltage.

[0032] (3)Measurement of short-circuit impedance from medium voltage to low voltage First, connect the ABC of the short-circuit impedance tester to the medium-voltage AmBmCm terminals of the device. Second, use the special short-circuit wire of the short-circuit impedance tester to short-circuit the low-voltage abc clamps on the transformer. Finally, turn on the short-circuit impedance tester, select a test current of <20 A (the regulation requires ≥5 A), and conduct the measurement of short-circuit impedance from medium voltage to low voltage.

[0033] ③ Test of the procedure and time during the on-load tap-changing process of the transformer First, connect the leads ABCO of the on-load tap-changing characteristic tester of the transformer to the high-voltage side ABCO of the device respectively. Second, turn on the power supply of the switching device and make abc short-circuited and not grounded. Finally, operate the on-load tap-changing characteristic tester of the transformer to complete the tests of the on-load switching dynamic transition resistance, switching process procedure and time.

[0034] ④ Measurement of the DC resistance of the transformer windings First, connect the voltage and current wires of the same length (1.5 m) on the DC resistance tester of the transformer windings to the terminals ABCO, AmBmCmOm, abco (△abc) of this device one by one. Then, conduct the DC resistance tester of the transformer windings to complete the tests of the high-voltage winding ABCO, medium-voltage winding AmBmCmOm, and low-voltage winding abco (△abc).

[0035] ⑤ Transformer turns ratio test function First, connect the voltage and current wires of the same length (1.5 m) on the transformer turns ratio tester to the terminals ABC, AmBmCm, abc of this device one by one. Then, operate the transformer turns ratio tester to complete the turns ratio test.

[0036] Advantages of the present invention: (1)Improve the test efficiency. By changing the wiring method, the time of manual operation is reduced, the risk of multiple wire changes is avoided, and the test efficiency is improved.

[0037] (2)Ensure the test safety and the safety of the test personnel. The development of this device does not require multiple high-altitude operations, and special test shielding wires are set to protect the safety of test equipment and personnel.

[0038] (3) Ensure the accuracy of test data. Through the internal switching module of the device, the test type can be quickly switched without redundant operations, ensuring the accuracy of test data and providing a reliable basis for the safe and stable operation of the transformer. Description of the Drawings

[0039] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0040] Figure 2 It is a schematic sectional structural diagram of an embodiment of the present invention.

[0041] Reference Numerals: 1 - box cover, 2 - box body, 3 - mounting panel, 4 - low-voltage terminal module, 5 - medium-voltage terminal module, 6 - high-voltage terminal module, 7 - excitation / response terminal module, 8 - intelligent display screen, 9 - power switch, 10 - charging port, 11 - grounding post, 12 - relay module, 13 - data output module, 14 - power module. Specific Embodiments

[0042] The present invention will be further described below with reference to the accompanying drawings.

[0043] Embodiment: As Figure 1 and Figure 2 shown, a transformer test wiring converter includes a box cover 1, a box body 2, a mounting panel 3, a low-voltage terminal module 4, a medium-voltage terminal module 5, a high-voltage terminal module 6, an excitation / response terminal module 7, an intelligent display screen 8, a power switch 9, a relay module 12, a data output module 13, and a power module 14; the mounting panel 3 is arranged on the upper part of the box body 2; the low-voltage terminal module 4, the medium-voltage terminal module 5, the high-voltage terminal module 6, the excitation / response terminal module 7, the intelligent display screen 8, and the power switch 9 are respectively arranged on the mounting panel 3; the relay module 12, the power module 14, and the data output module 13 are respectively arranged below the mounting panel 3; the low-voltage terminal module 4, the medium-voltage terminal module 5, the high-voltage terminal module 6, and the excitation / response terminal module 7 are respectively electrically connected to the data output module 13 through the relay module 12; the data output module 13 is electrically connected to the intelligent display screen 8.

[0044] Further, a charging port 10 is also arranged on the mounting panel 3; the charging port 10 is electrically connected to the power module 14.

[0045] Further, a grounding post 11 is also arranged on the mounting panel 3.

[0046] Further, the low-voltage terminal module 4, the medium-voltage terminal module 5, the high-voltage terminal module 6, and the excitation / response terminal module 7 are arranged in sequence from top to bottom on the left side of the mounting panel 3; the intelligent display screen 8 is arranged at the upper right side position of the mounting panel 3; the power switch 9 is arranged at the lower right side position of the mounting panel 3.

[0047] Further, the low-voltage terminal module 4 is composed of an insulating board and a plurality of low-voltage terminal posts; the medium-voltage terminal module 5 is composed of an insulating board and a plurality of medium-voltage terminal posts; the high-voltage terminal module 6 is composed of an insulating board and a plurality of high-voltage terminal posts; the excitation / response terminal module 7 is composed of an insulating board, an excitation terminal post, and three response terminal posts.

[0048] Further, the rear side of the box cover 1 is hinged to the upper edge of the rear panel of the box body 2, and the front side of the box cover 1 is connected to the upper edge of the front panel of the box body 2 through a snap assembly.

[0049] Obviously, the above embodiments are merely examples for clearly explaining the present invention and are not intended to limit the implementation of the present invention. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description; it is not necessary and impossible to enumerate all the implementation manners here; and the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A transformer test wiring converter, characterized in that: It includes a box cover (1), a box body (2), an installation panel (3), a low-voltage terminal module (4), a medium-voltage terminal module (5), a high-voltage terminal module (6), an excitation / response terminal module (7), an intelligent display screen (8), a power switch (9), a relay module (12), a data output module (13) and a power module (14); The installation panel (3) is arranged on the upper part of the box body (2); The low-voltage terminal module (4), the medium-voltage terminal module (5), the high-voltage terminal module (6), the excitation / response terminal module (7), the intelligent display screen (8) and the power switch (9) are respectively arranged on the installation panel (3); The relay module (12), the power module (14) and the data output module (13) are respectively arranged below the installation panel (3); The low-voltage terminal module (4), the medium-voltage terminal module (5), the high-voltage terminal module (6) and the excitation / response terminal module (7) are respectively electrically connected to the data output module (13) through the relay module (12); The data output module (13) is electrically connected to the intelligent display screen (8).

2. The transformer test wiring converter according to claim 1, characterized in that: A charging port (10) is also arranged on the installation panel (3); the charging port (10) is electrically connected to the power module (14).

3. The transformer test wiring converter according to claim 1, wherein: A grounding post (11) is also arranged on the installation panel (3).

4. The transformer test wiring converter according to claim 1, wherein: The low-voltage terminal module (4), the medium-voltage terminal module (5), the high-voltage terminal module (6) and the excitation / response terminal module (7) are arranged in sequence from top to bottom on the left side of the installation panel (3); the intelligent display screen (8) is arranged at the upper right side position of the installation panel (3); the power switch (9) is arranged at the lower right side position of the installation panel (3).

5. The transformer test wiring converter according to claim 1, characterized in that: The low-voltage terminal module (4) is composed of an insulating board and a plurality of low-voltage terminal posts; the medium-voltage terminal module (5) is composed of an insulating board and a plurality of medium-voltage terminal posts; the high-voltage terminal module (6) is composed of an insulating board and a plurality of high-voltage terminal posts; the excitation / response terminal module (7) is composed of an insulating board, an excitation terminal post and three response terminal posts.

6. The transformer test wiring converter according to claim 1, characterized in that: The rear side of the box cover (1) is hinged to the upper edge of the rear panel of the box body (2), and the front side of the box cover (1) is connected to the upper edge of the front panel of the box body (2) through a buckle assembly.

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