CN204142777U - Voltage transformer (VT) calibrating termination - Google Patents

Abstract

The utility model discloses a wiring device for voltage transformer verification, which is characterized in that it comprises a low-voltage power distribution box, a single-chip switch, a monitoring voltmeter, connecting terminals and wires, and the single-chip switch is installed in the low-voltage power distribution box. The three input terminals of the wiring device are connected to the test terminals of the tested transformer, and the output terminals are connected to the sampling terminals of the transformer calibrator, and two of the output terminals are connected to the monitoring voltmeter, which is used to protect the transformer calibration when switching circuits. The tester is protected from impact voltage damage. When in use, switch between three different measurement circuits by operating the on-off of the single-chip switch. Applying this device can complete the verification of multiple transformers through only one step-up process, which greatly improves the verification work efficiency, reduces the number of personnel configuration, reduces the number of assembly and disassembly of high-voltage test lines, reduces the charging time of high-voltage tests, and reduces the test time. The safety risks in the process have been improved, and the safety benefits of the enterprise have been improved.

Description

Wiring device for voltage transformer verification

technical field

The utility model relates to the technical field of voltage transformer verification.

Background technique

The function of the voltage transformer is to transform the high voltage into a standard secondary voltage of 100V or lower in proportion to the use of protection, metering, and instrumentation devices. At the same time, the high voltage can be isolated from the electrical workers by using the voltage transformer. The safety of personnel is guaranteed. Due to the above functions, voltage transformers are widely used in the fields of power generation, transmission and distribution. When used for metering and instrumentation devices, in order to measure or measure accurately, it is necessary to regularly perform metering verification on voltage transformers, otherwise the accuracy cannot be guaranteed, resulting in protection malfunctions and metering errors. During the verification process, it is necessary to connect the AC power supply, the voltage regulator, the booster and the standard voltage transformer in sequence, and the standard voltage transformer is then connected to the voltage transformer under test. In the process, only one tested voltage transformer can be verified, and there are usually two to three transformers in each group on site. It needs to assemble and disassemble the high-voltage test line many times, and carry out the process of raising the voltage multiple times. It requires the cooperation of multiple verification staff. The operation time with high voltage is long, the safety risk is high, and the verification work efficiency is low.

Utility model content

The technical problem to be solved by the utility model is to provide a wiring device for the verification of voltage transformers, which can complete the verification of two or three transformers only through one boosting process, greatly improving the verification work efficiency and reducing safety risks .

In order to solve the above technical problems, the technical solution adopted by the utility model is: a wiring device for voltage transformer verification, which is characterized in that it includes a low-voltage power distribution box, a single-chip switch, a monitoring voltmeter, a terminal block and a wire, and a single The chip switch is installed in the low-voltage distribution box, the second single-chip switch is connected in series between the first input terminal and the first output terminal, and the fourth single-chip switch is connected in series between the second input terminal and the first output terminal. The first single-chip switch is connected in series between the first input connection terminal and the second output connection terminal, the third single-chip switch is connected in series between the second input connection terminal and the second output connection terminal, and the second output connection terminal and the third output connection terminal are connected in series. Monitor the voltmeter in series between the terminals, the first input terminal and the second input terminal are respectively used to connect the secondary winding terminals of two verified voltage transformers, the first output terminal and the third output terminal Connect the terminal to the transformer calibrator.

When verifying the voltage transformer, connect the AC power supply, the voltage regulator, the booster and the standard voltage transformer in sequence, connect the primary coil of the standard voltage transformer and the primary coils of the two voltage transformers to be tested in parallel, and the standard voltage The secondary coil x ₀ terminal of the transformer is connected to the x terminal of the transformer calibrator, the secondary coil a ₀ terminal of the standard voltage transformer, the secondary coil a ₁ terminal of the two voltage transformers to be tested and a _{The 2} terminals are respectively connected to the a terminal of the transformer calibrator, the secondary coil x of the voltage transformer to be tested is connected to the _first input terminal of the wiring device, and the secondary coil of the voltage transformer to be tested is x _{The 2} terminals are connected to the second input terminal of the wiring device, the first output terminal is connected to the D terminal of the transformer calibrator, the third output terminal is connected to the K terminal of the transformer calibrator, and the transformer calibrator The series impedance between the D terminal and the A terminal of the instrument, the monolithic switch of the wiring device is always set to open. When verifying the voltage transformer to be tested, first close the first single-chip switch. When the voltmeter indicates that it is not more than 5%, it is considered that the polarity and wiring are correct. Turn off the first single-chip switch and close the second single-chip switch. At this time, the mutual inductance The error of the voltage transformer 1 to be tested can be measured from the transformer calibrator when the measurement circuit of the instrument calibrator is connected, and the second single-chip switch is disconnected after measurement; when the voltage transformer 2 to be tested is verified, the third single-chip switch is first closed When the indication of the voltmeter is not more than 5%, it is considered that the polarity and wiring are correct. Turn off the third single-chip switch and close the fourth single-chip switch. At this time, the measurement circuit of the transformer calibrator is connected. The tester measures the error of the second voltage transformer to be tested, and disconnects the fourth single-chip switch after measurement.

As an improvement of this technical solution, a wiring device for voltage transformer verification is characterized in that it also includes a sixth single-chip switch connected in series between the third input terminal and the first output terminal, and the third input terminal The fifth monolithic switch is connected in series with the second output connection terminal, and the third input connection terminal is connected to the secondary winding terminal of the third verified voltage transformer.

When verifying the voltage transformer, connect the AC power supply, voltage regulator, booster and standard voltage transformer in sequence, connect the primary coil of the standard voltage transformer and the primary coil of the voltage transformer to be tested in parallel, and connect the standard voltage transformer Connect the terminal x ₀ of the secondary coil to the terminal x of the transformer calibrator, the terminal a ₀ of the secondary coil of the standard voltage transformer, the terminals a ₁ and a ₂ of the secondary coils of the three voltage transformers to be tested and a ₃ terminals are respectively connected to the a terminal of the transformer calibrator, the secondary coil x ₁ terminal of the voltage transformer to be tested is connected to the first input terminal of the wiring device, and the secondary coil of the voltage transformer to be tested The coil x ₂ ends are connected to the second input terminal of the wiring device, the secondary coil x ₃ of the voltage transformer to be tested is connected to the third input terminal of the wiring device, and the first output terminal is connected to the transformer calibrating terminal. The D terminal of the transformer calibrator is connected, the third output terminal is connected to the K terminal of the transformer calibrator, the impedance is connected in series between the D terminal and the a terminal of the transformer calibrator, and the single-chip switch of the wiring device is always set to off. When verifying the voltage transformer to be tested, first close the first single-chip switch. When the voltmeter indicates that it is not more than 5%, it is considered that the polarity and wiring are correct. Turn off the first single-chip switch and close the second single-chip switch. At this time, the mutual inductance The error of the voltage transformer 1 to be tested can be measured from the transformer calibrator when the measurement circuit of the instrument calibrator is connected, and the second single-chip switch is disconnected after measurement; when the voltage transformer 2 to be tested is verified, the third single-chip switch is first closed When the indication of the voltmeter is not more than 5%, it is considered that the polarity and wiring are correct. Turn off the third single-chip switch and close the fourth single-chip switch. At this time, the measurement circuit of the transformer calibrator is connected. The tester measures the error of the second voltage transformer to be tested, and disconnects the fourth single-chip switch after measurement; when verifying the third voltage transformer to be tested, first close the fifth single-chip switch, and when the voltmeter indicates that it is not greater than 5%, it is considered extremely The sex and wiring are correct, turn off the fifth single-chip switch, close the sixth single-chip switch, at this time, the measurement circuit of the transformer calibrator is connected, and the error of the voltage transformer three to be tested can be measured from the transformer calibrator. Open the sixth monolithic switch after measurement.

The beneficial effect of adopting the above-mentioned technical scheme is that: the application of this device can complete the verification of multiple transformers through only one step-up process, which greatly improves the verification work efficiency, reduces the staffing, and reduces the installation and disassembly of high-voltage test lines. The number of times, reducing the electrification time of the high-voltage test, reduces the safety risk during the test process, and improves the safety benefits of the enterprise.

Description of drawings

Fig. 1 is a structural representation of the utility model;

Fig. 2 is a schematic circuit diagram of the utility model.

1. The first single-chip switch; 2. The second single-chip switch; 3. The third single-chip switch; 4. The fourth single-chip switch; 5. The fifth single-chip switch; 6. The sixth single-chip switch; 7. The first input terminal; 8. The second input terminal; 9. The third input terminal; 10. The first output terminal; 11. The second output terminal; 12. The third output terminal; 13. Monitoring voltage Table; 14. Voltage transformer to be tested; 15. Standard voltage transformer; 16. Booster; 17. Voltage regulator; 18. AC power supply; 19. Transformer calibrator; 20. Wiring device;

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

Detailed ways

Specific implementation mode one

The wiring device for voltage transformer verification includes a low-voltage power distribution box, four single-chip switches, a monitoring voltmeter 13, terminals and wires, the single-chip switch is installed in the low-voltage power distribution box, the first input terminal 7 and the second The second single-chip switch 2 is connected in series between an output connection terminal 10, the fourth single-chip switch 4 is connected in series between the second input connection terminal 8 and the first output connection terminal 10, and the first input connection terminal 7 and the second output connection terminal The first single-chip switch 1 is connected in series between 11, the third single-chip switch 3 is connected in series between the second input terminal 8 and the second output terminal 11, and the second output terminal 11 and the third output terminal 12 are connected in series Monitor voltmeter 13.

When verifying the two voltage transformers, connect the AC power supply 18, the voltage regulator 17, the booster 16 and the standard voltage transformer 15 in sequence, and connect the primary coil of the standard voltage transformer 15 and the two voltage transformers to be tested. The primary coil of the standard voltage transformer 15 is connected in parallel with the secondary coil x ₀ terminal of the standard voltage transformer 15 and the x terminal of the transformer calibrator 19, the secondary coil a ₀ terminal of the standard voltage transformer 15, two voltages to be measured Terminal _a1 and terminal _a2 of the secondary coil of the transformer are respectively connected to terminal a of the transformer calibrator 19, and terminal _x1 of the secondary coil of the voltage transformer to be tested is connected to the first input terminal of the wiring device 7. The secondary coil x ₂ of the voltage transformer to be tested is connected to the second input terminal 8 of the wiring device, the first output terminal 10 is connected to the D terminal of the transformer calibrator 19, and the third output connection The terminal 12 is connected to the K terminal of the transformer calibrator 19, and the impedance is connected in series between the D terminal and the a terminal of the transformer calibrator 19, and the monolithic switch of the wiring device is always set to be disconnected. To test the voltage transformer to be tested, first close the first single-chip switch 1, and when the voltmeter indicates that it is not more than 5%, it is considered that the polarity and wiring are correct, disconnect the first single-chip switch 1, and close the second single-chip switch 2, Now the transformer calibrator 19 measurement loops are connected and can measure the error of the voltage transformer to be measured from the transformer calibrator 19, and disconnect the second monolithic switch 2 after the measurement; First close the third single-chip switch 3, when the indication of the voltmeter is not more than 5%, it is considered that the polarity and wiring are correct, disconnect the third single-chip switch 3, and close the fourth single-chip switch 4, at this time the transformer calibrator 19 When the measurement circuit is connected, the error of the voltage transformer 2 to be tested can be measured from the transformer calibrator 19, and the fourth single-chip switch 4 is disconnected after the measurement.

Specific implementation mode two

As an improvement of the first specific embodiment, a wiring device for voltage transformer verification is characterized in that it also includes a sixth single-chip switch 6 connected in series between the third input terminal 9 and the first output terminal 10, the first The fifth single-chip switch 5 is connected in series between three input terminals 9 and the second output terminal 11, and the third input terminal 9 is connected to the secondary winding terminal of the voltage transformer three to be verified, and the voltage transformer three to be verified The terminal a ₃ of the secondary coil of the voltage transformer to be tested is connected to the terminal a of the transformer calibrator 19, and the terminal x ₃ of the secondary coil of the voltage transformer to be tested is connected to the third input terminal 9 of the wiring device. The remaining connection modes are the same as those in the first embodiment.

When verifying the voltage transformer to be tested, first close the fifth single-chip switch 5, and when the voltmeter indicates that the polarity and wiring are not greater than 5%, disconnect the fifth single-chip switch 5 and close the sixth single-chip switch 6 At this time, the transformer calibrator 19 measuring circuit is connected and the error of the voltage transformer three to be tested can be measured from the transformer calibrator 19, and the sixth single-chip switch 6 is disconnected after measurement.

Claims (2)

1. a voltage transformer (VT) calibrating termination, it is characterized in that: comprise low-voltage distribution box, single-chip switching, monitor voltage table (13), connection terminal and wire, single-chip switching is loaded in low-voltage distribution box, first input wires terminal (7) and the second single-chip switching (2) of connecting between the first output wiring terminal (10), second input wires terminal (8) and the 4th single-chip switching (4) of connecting between the first output wiring terminal (10), first input wires terminal (7) and the first single-chip switching (1) of connecting between the second output wiring terminal (11), second input wires terminal (8) and the 3rd single-chip switching (3) of connecting between the second output wiring terminal (11), serial monitoring voltage table between second output wiring terminal (11) and the 3rd output wiring terminal (12), described first input wires terminal (7) and the second input wires terminal (8) are used for the secondary wire wrap terminal of connection two accredited voltage transformer (VT) respectively, described first output wiring terminal (10) is connected mutual-inductor tester with the 3rd output wiring terminal (12).

2. a kind of voltage transformer (VT) calibrating termination according to claim 1, it is characterized in that: also comprise the 3rd input wires terminal (9) and the 6th single-chip switching (6) of connecting between the first output wiring terminal (10), 3rd input wires terminal (9) and the 5th single-chip switching (5) of connecting between the second output wiring terminal (11), described 3rd input wires terminal (9) connects the secondary wire wrap terminal waiting to examine and determine voltage transformer (VT) three.