Voltage transformer testing device

Abstract

A voltage transformer testing device comprises a control box and a high-voltage box which are arranged in a matched mode, the control box is used for sending out a control instruction to conduct electrical detection, three single-phase electric voltage regulators are adopted to regulate output voltage, and three-phase simultaneous voltage increasing and reducing operation and A-phase, B-phase and C-phase voltage increasing and reducing operation can be achieved; the high-voltage box is used for arranging a high-voltage voltmeter so as to carry out high-voltage output and three-phase independent overcurrent protection; the control box is provided with a plurality of boost keys and a plurality of buck keys so as to independently control the three single-phase electric voltage regulators. A control input interface and a high-voltage voltmeter are arranged on the high-voltage box, and the high-voltage voltmeter comprises an A-phase output voltage display meter, a B-phase output voltage display meter and a C-phase output voltage display meter.

Description

Technical field:

[0001] The utility model relates to a voltage transformer testing device. Background technology:

[0002] A voltage transformer is an instrument used to transform voltage. It is mainly used to power measuring instruments and relay protection devices, to measure the voltage, power and electric energy of the line, or to protect valuable equipment, motors and transformers in the line when a line fault occurs.

[0003] In actual use, newly built substations often encounter PT and secondary protection device circuit failures during power transmission, affecting normal power transmission. Therefore, a voltage transformer test device is required to pressurize the primary side to verify the correctness of the secondary circuit before power transmission. However, the existing test device cannot provide wrong connection protection warning, so it is not well suitable for substation application scenarios with high safety requirements. At the same time, the existing test device has a relatively fixed and single boost control form and buck control form for the three phases A, B, and C, which can easily lead to errors in the test results and cannot accurately verify the correctness of the voltage transformer circuit. Utility model content:

[0004] The embodiment of the utility model provides a voltage transformer test device, which is based on the mutual cooperation of the control box and the high-voltage box, and adopts a multi-core special communication cable for connection control, which can ensure that a sufficient safety distance is maintained between the staff and the high-voltage output box, and can perform secondary circuit phase sequence inspection of the high-voltage switch cabinet protection device and high-voltage control room protection detection before power is supplied to a large new substation. It has a power input wrong connection protection function and a flexible and practical three-phase step-up and step-down control mode, which can be well applied to substation application scenarios with high safety requirements, ensure the accuracy of the test results, and thus accurately verify the circuit correctness of the voltage transformer. At the same time, it has a three-phase independent overcurrent protection function, which improves the safety and practicality of the overall test process and solves the problems existing in the prior art.

[0005] The technical solution adopted by the utility model to solve the above technical problems is:

[0006] A voltage transformer test device, comprising a control box and a high-voltage box arranged in coordination with each other, wherein the control box is used to issue control instructions for electrical testing, and three single-phase electric voltage regulators are used to adjust the output voltage, and the three-phase voltage can be raised and lowered at the same time, and the A, B, and C phases can be raised and lowered respectively; the high-voltage box is used to set a high-voltage voltmeter to perform high-voltage output and three-phase independent over-current protection;

[0007] The control box is provided with a plurality of boost buttons and buck buttons to independently control three single-phase electric voltage regulators; the high-voltage box is provided with a control input interface and a high-voltage voltmeter, which includes an A-phase output voltage display meter, a B-phase output voltage display meter and a C-phase output voltage display meter.

[0008] The control box is provided with an A-phase output parameter meter, a B-phase output parameter meter and a C-phase output parameter meter to display voltage parameters, current parameters and frequency parameters.

[0009] The control box is connected with a remote control panel, on which remote control buttons are arranged to realize remote control of the control box.

[0010] A power abnormality alarm is provided on the control box.

[0011] A start button and a power switch are arranged on the control box.

[0012] An output interface is provided on the control box, and the high-voltage box is connected to the output interface of the control box through a control input interface and a multi-core special communication cable to achieve electrical connection between the control box and the high-voltage box.

[0013] A high-voltage output warning light is provided on the high-voltage box, which cooperates with the backlight of the output voltage display meter to display the high-voltage output status of the high-voltage box.

[0014] A handle is provided on the control box.

[0015] The utility model adopts the above structure, sends out control instructions through the control box to perform electrical detection, adopts three single-phase electric voltage regulators to adjust the output voltage, and can have three-phase simultaneous voltage increase and voltage reduction operations and A, B, and C phases respectively voltage increase and voltage reduction operations; a high-voltage voltmeter is set through the high-voltage box to generate and display high-voltage output and perform three-phase operations; a plurality of boost buttons and voltage reduction buttons are set on the control box to independently control the three single-phase electric voltage regulators; remote control of the control box is achieved through the remote control panel and remote control buttons, which has the advantages of accuracy, practicality, safety and reliability. Description of the drawings:

[0016] Figure 1 It is a structural schematic diagram of the control box of the utility model.

[0017] Figure 2 It is a structural schematic diagram of the high-voltage box of the utility model. Specific implementation method:

[0018] In order to clearly illustrate the technical features of the present invention, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0019] like Figure 1-2As shown in, a voltage transformer test device includes a control box and a high-voltage box that are arranged in coordination with each other. The control box is used to issue control instructions for electrical testing, and three single-phase electric voltage regulators are used to adjust the output voltage. It can have three-phase simultaneous voltage increase and voltage decrease operations and A, B, and C phases respectively voltage increase and voltage decrease operations; the high-voltage box is used to set a high-voltage voltmeter to perform high-voltage output and three-phase independent over-current protection;

[0020] The control box is provided with a plurality of boost buttons and buck buttons to independently control three single-phase electric voltage regulators; the high-voltage box is provided with a control input interface and a high-voltage voltmeter, which includes an A-phase output voltage display meter, a B-phase output voltage display meter and a C-phase output voltage display meter.

[0021] The control box is provided with an A-phase output parameter meter, a B-phase output parameter meter and a C-phase output parameter meter to display voltage parameters, current parameters and frequency parameters.

[0022] The control box is connected with a remote control panel, on which remote control buttons are arranged to realize remote control of the control box.

[0023] A power abnormality alarm is provided on the control box.

[0024] A start button and a power switch are arranged on the control box.

[0025] An output interface is provided on the control box, and the high-voltage box is connected to the output interface of the control box through a control input interface and a multi-core special communication cable to achieve electrical connection between the control box and the high-voltage box.

[0026] A high-voltage output warning light is provided on the high-voltage box, which cooperates with the backlight of the output voltage display meter to display the high-voltage output status of the high-voltage box.

[0027] A handle is provided on the control box.

[0028] The working principle of a voltage transformer test device in the embodiment of the utility model is: based on the mutual cooperation between the control box and the high-voltage box, a multi-core dedicated communication cable is used for connection control, which can ensure that a sufficient safety distance is maintained between the staff and the high-voltage output box, and the secondary circuit phase sequence inspection of the high-voltage switch cabinet protection device and the high-voltage control room protection detection can be carried out before power is supplied to a large new substation. It has a power input wrong connection protection function and a flexible and practical three-phase step-up and step-down control mode, which can be well applied to substation application scenarios with high safety requirements, ensure the accuracy of the test results, and thus accurately verify the circuit correctness of the voltage transformer. At the same time, it has a three-phase independent overcurrent protection function, which improves the safety and practicality of the overall test process.

[0029] This application has the function of detecting the input power supply voltage. When the input power supply phase is lost or the voltage is abnormal, the instrument will automatically cut off the internal circuit of the test device to enter protection. At this time, the power supply abnormality alarm will be activated, and the "power supply abnormality" sound and light alarm will be sounded and lighted, and the internal main power supply circuit will be cut off to prevent damage to the test device due to voltage errors or errors.

[0030] The overall solution mainly includes a control box and a high-voltage box that are arranged in coordination with each other. The control box is used to issue control instructions for electrical detection. Three single-phase electric voltage regulators are used to adjust the output voltage. It can have three-phase simultaneous voltage increase and decrease operations and A, B, and C phases respectively increase and decrease voltage operations; the high-voltage box is used to set a high-voltage voltmeter to perform high-voltage output and three-phase independent over-current protection;

[0031] The control box is provided with a plurality of boost buttons and buck buttons to independently control three single-phase electric voltage regulators; the high-voltage box is provided with a control input interface and a high-voltage voltmeter, which includes an A-phase output voltage display meter, a B-phase output voltage display meter and a C-phase output voltage display meter.

[0032] The high voltage "start" of the control box adopts the zero-position start protection function. The device control box has the function of automatic zeroing of the voltage regulator. The three-phase voltage regulator can be started under the zero-position state. In the non-zero position state, the product self-protection cannot be started.

[0033] After the high voltage is "started", if the voltage is not increased for 5-7 seconds, the device will automatically cut off the high voltage output circuit. When the three phases of the voltage regulator are adjusted to zero at the end of the test, the instrument will automatically cut off the high voltage output. The device is equipped with a three-phase independent overcurrent protection function. The overcurrent protection action will immediately cut off the high voltage output, and the internal electric voltage regulator will automatically return to zero at the same time to facilitate the next step of the operation test.

[0034] The control box is equipped with A-phase output parameter meter, B-phase output parameter meter and C-phase output parameter meter to display voltage parameters, current parameters and frequency parameters. The high-voltage box is equipped with a high-voltage voltmeter. The three phases of the device have independent over-current protection to ensure the safety of equipment and personnel.

[0035] In order to facilitate on-site testing, the instrument has a long-distance remote control function to achieve remote control of the control box.

[0036] When measuring a group of voltage transformers separately, place the test device "high-voltage box" at the rear cabinet door of the group of voltage transformers to be tested, and connect the output high-voltage dedicated lines to the high-voltage terminals of the three-phase voltage transformers under test. The high-voltage lines should be straightened as much as possible and maintain a sufficient safety distance from the ground and the other two phases.

[0037] When measuring the voltage transformer of the entire station, the 10kV main transformer incoming cabinet, station transformer cabinet, capacitor cabinet, and all outgoing cabinets shall be taken out of operation before measurement, all switch trolleys shall be placed in the test position, all outgoing grounding switches of the withdrawn switch cabinets shall be in the closed position, and all 10kV busbars and all voltage transformer cabinets shall enter the closed operating state.

[0038] Then place the test device "high-voltage box" at the rear door of a group of voltage transformers that are convenient for testing, open the rear door correctly, and use the dedicated high-voltage wire configured for the test device to connect to the A / B / C on the high-voltage primary side respectively. The high-voltage wire should be straightened and maintain a sufficient safety distance from the ground and the other two phases.

[0039] Reliably ground the grounding terminals on the control box and high-voltage box, and then reliably connect the control box and the high-voltage box with special cables. Set the rear cabinet doors of the high-voltage box and voltage transformer of the device within the safety fence. Before the test, please close and lock the high-voltage room door and all passages and cable pits and holes, and assign special personnel to guard them.

[0040] The specific process is: first check and confirm that the power switch on the control box is in the "off" position, then connect the test device to the three-phase four-wire test power supply, and supply power after checking that it is correct; during the test, close the power switch on the control box, at this time the output meter on the control box begins to display, and the button switch indicator light lights up; if there is an abnormal power supply sound and light alarm or the meter does not display and the button indicator light does not work, check and eliminate whether the input power is abnormal.

[0041] Press the high voltage start button on the test device, the high voltage starts to output, the high voltage output indicator on the control box lights up, and the backlight of the A / B / C output voltmeter and the high voltage output warning light on the high voltage box start flashing, which proves that the high voltage output has started to work.

[0042] Press the "A / B / C" rising button on the control box, observe the "A phase, B phase, C phase output" parameter table of the control box and the high-voltage output voltage table on the high-voltage box, and increase it to the required voltage. According to the needs, you can perform single-phase "boost" and "voltage reduction" to adjust to the required voltage. At this time, you can check whether the secondary device voltage and phase sequence on all switch cabinets are correct. Adjust the single-phase boost and voltage reduction on the control box to check the phase and zero-sequence voltage. The phase sequence can be changed by adjusting the input power phase.

[0043] After the test is completed, press the "voltage reduction" button on the control box. After the three phases of the voltage regulator are reduced to zero, the control box will automatically cut off the "high voltage output". Then disconnect the "power switch" on the control box to complete the test.

[0044] It should be noted that before the device is put into operation, the grounding terminals of the control box and the high-voltage box must be reliably grounded, and the grounding wires must comply with safety technical regulations.

[0045] To sum up, a voltage transformer test device in an embodiment of the utility model is based on the mutual cooperation of a control box and a high-voltage box, and adopts a multi-core dedicated communication cable for connection control, which can ensure that a sufficient safety distance is maintained between the staff and the high-voltage output box, and can perform secondary circuit phase sequence inspection of the high-voltage switch cabinet protection device and high-voltage control room protection detection before power is supplied to a large new substation. It has a power input misconnection protection function and a flexible and practical three-phase step-up and step-down control mode, and can be well applied to substation application scenarios with high safety requirements, ensuring the accuracy of the test results, thereby accurately verifying the circuit correctness of the voltage transformer, and at the same time having a three-phase independent overcurrent protection function, thereby improving the safety and practicality of the overall test process.

[0046] The above-mentioned specific implementation manner cannot be used as a limitation on the protection scope of the present utility model. For those skilled in the art, any replacement, improvement or change made to the implementation manner of the present utility model falls within the protection scope of the present utility model.

[0047] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A voltage transformer test device, characterized in that: It includes a control box and a high-voltage box that are arranged in coordination with each other. The control box is used to issue control instructions for electrical detection. Three single-phase electric voltage regulators are used to adjust the output voltage. It can have three-phase simultaneous voltage increase and voltage decrease operations and A, B, and C phases respectively voltage increase and voltage decrease operations; the high-voltage box is used to set a high-voltage voltmeter to perform high-voltage output and three-phase independent over-current protection; The control box is provided with a plurality of boost buttons and buck buttons to independently control three single-phase electric voltage regulators; the high-voltage box is provided with a control input interface and a high-voltage voltmeter, which includes an A-phase output voltage display meter, a B-phase output voltage display meter and a C-phase output voltage display meter.

2. A voltage transformer test device according to claim 1, characterized in that: The control box is provided with an A-phase output parameter meter, a B-phase output parameter meter and a C-phase output parameter meter to display voltage parameters, current parameters and frequency parameters.

3. A voltage transformer test device according to claim 1, characterized in that: The control box is connected with a remote control panel, on which remote control buttons are arranged to realize remote control of the control box.

4. A voltage transformer test device according to claim 1, characterized in that: A power abnormality alarm is provided on the control box.

5. A voltage transformer test device according to claim 1, characterized in that: A start button and a power switch are arranged on the control box.

6. A voltage transformer test device according to claim 1, characterized in that: An output interface is provided on the control box, and the high-voltage box is connected to the output interface of the control box through a control input interface and a multi-core special communication cable to achieve electrical connection between the control box and the high-voltage box.

7. A voltage transformer test device according to claim 1, characterized in that: A high-voltage output warning light is provided on the high-voltage box, which cooperates with the backlight of the output voltage display meter to display the high-voltage output status of the high-voltage box.

8. A voltage transformer test device according to claim 1, characterized in that: A handle is provided on the control box.

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