CN107300684B - A Check Method of Transformer Differential Protection Secondary Circuit - Google Patents
A Check Method of Transformer Differential Protection Secondary Circuit Download PDFInfo
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Abstract
一种变压器差动保护二次回路的校核方法，属于电力系统差动保护领域。所述校核方法通过在变压器低压侧设置三相大电流发生器的方式，解决了现有因待保护的变压器的负荷电流过小而导致变压器差动保护电流互感器二次接线的带负荷测试无法进行的问题。所述校核方法通过将差动保护装置采集的电流互感器的二次绕组的感应电流与其理论值做比较的方式来判断差动保护装置的参数设置是否正确。所述校核方法以差电流是否为0为依据来判断差动保护二次回路的接线是否正确。所述校核方法以同侧三相电流互感器的二次绕组的感应电流是否为正相序为依据来判断差动保护二次回路的电流互感器的极性是否正确。本发明所述方法适用于对变压器差动保护二次回路进行校核。
The invention discloses a checking method for the secondary circuit of transformer differential protection, belonging to the field of differential protection of power systems. The verification method solves the existing load test of the secondary wiring of the differential protection current transformer of the transformer caused by the excessively small load current of the transformer to be protected by arranging a three-phase large current generator on the low voltage side of the transformer. Unable to proceed. The checking method judges whether the parameter setting of the differential protection device is correct by comparing the induced current of the secondary winding of the current transformer collected by the differential protection device with its theoretical value. The checking method judges whether the wiring of the secondary circuit of the differential protection is correct on the basis of whether the differential current is 0 or not. The checking method judges whether the polarity of the current transformer of the secondary circuit of the differential protection is correct on the basis of whether the induced current of the secondary winding of the same-side three-phase current transformer is in positive phase sequence. The method of the invention is suitable for checking the secondary circuit of transformer differential protection.
Description
技术领域technical field
本发明涉及一种差动保护二次回路的校核方法，属于电力系统差动保护领域。The invention relates to a checking method for a secondary circuit of differential protection, which belongs to the field of differential protection of power systems.
背景技术Background technique
变压器差动保护作为变压器的主保护，对于保护区内发生故障的反应灵敏度非常高。然而，往往由于电流互感器二次接线不正确，导致变压器差动保护正确动作率偏低。在实际工作中，为了判断变压器差动保护电流互感器二次接线是否正确，不仅需要对其进行理论分析，而且需要对其进行带负荷测试。As the main protection of the transformer, the differential protection of the transformer has a very high response sensitivity to faults in the protection zone. However, often due to the incorrect secondary wiring of the current transformer, the correct action rate of the transformer differential protection is low. In actual work, in order to judge whether the secondary wiring of the transformer differential protection current transformer is correct, it is not only necessary to carry out theoretical analysis, but also to carry out a load test.
现有变压器差动保护电流互感器二次接线的带负荷测试方法为：调整系统的一次运行方式，使投运设备串接于负荷电流中，在二次回路中产生大于20mA的测试电流，以进行带负荷的测量。理论上，负荷电流越大越好，负荷电流越大，各种错误在差电流中的体现就越明显，就越容易判断。测试用负荷应满足所用测试仪器精度要求，并能保证差电流和负荷电流的可比性。但是实际运行的变压器，负荷电流受电网运行方式限制，不能无限制调节，实际工作中，常常因为出线负荷太小，需多次调整运行方式调动负荷以满足测试要求。尤其是随着地区电网的迅速发展，许多新变电站投运时往往低压侧出线还没有负荷，甚至部分变电站没有电容器，导致带负荷测试无法实施。The load test method for the secondary wiring of the existing transformer differential protection current transformer is: adjusting the primary operation mode of the system, so that the commissioning equipment is connected in series with the load current, and a test current greater than 20mA is generated in the secondary circuit, so that the Carry out measurements with load. Theoretically, the larger the load current, the better. The larger the load current, the more obvious the various errors are in the differential current, and the easier it is to judge. The test load should meet the accuracy requirements of the test instrument used, and ensure the comparability of the differential current and the load current. However, in the actual operation of the transformer, the load current is limited by the operation mode of the power grid and cannot be adjusted indefinitely. In actual work, often because the outgoing load is too small, it is necessary to adjust the operation mode many times to mobilize the load to meet the test requirements. Especially with the rapid development of regional power grids, many new substations often have no load on the low-voltage side when they are put into operation, and even some substations do not have capacitors, which makes the load test impossible.
发明内容SUMMARY OF THE INVENTION
本发明为解决因待保护的变压器的负荷电流过小而导致变压器差动保护电流互感器二次接线的带负荷测试无法进行的问题，提出了一种变压器差动保护二次回路的校核方法。In order to solve the problem that the load test of the secondary wiring of the transformer differential protection current transformer cannot be carried out because the load current of the transformer to be protected is too small, the invention proposes a checking method for the secondary circuit of the transformer differential protection. .
本发明所述的变压器差动保护二次回路的校核方法基于三相大电流发生器实现；The checking method of the transformer differential protection secondary circuit of the present invention is realized based on a three-phase high-current generator;
当三相大电流发生器的输出电流满足差动保护装置的测量精度时，所述校核方法包括：When the output current of the three-phase high-current generator meets the measurement accuracy of the differential protection device, the checking method includes:
S1、在待保护的变压器投产前，将其差动保护二次回路接好，并将变压器高压侧三相短路接地；S1. Before the transformer to be protected is put into production, connect its differential protection secondary circuit, and short-circuit the three-phase ground on the high-voltage side of the transformer;
S2、采用三相大电流发生器对变压器的低压侧施加三相电流；S2. Use a three-phase large current generator to apply three-phase current to the low-voltage side of the transformer;
三相大电流发生器的A相输出电流依次经低压侧A相电流互感器的一次绕组、变压器和高压侧A相电流互感器的一次绕组，流入大地；The A-phase output current of the three-phase high-current generator flows into the earth through the primary winding of the low-voltage side A-phase current transformer, the transformer and the primary winding of the high-voltage side A-phase current transformer;
三相大电流发生器的B相输出电流依次经低压侧B相电流互感器的一次绕组、变压器和高压侧B相电流互感器的一次绕组，流入大地；The B-phase output current of the three-phase high-current generator flows into the earth through the primary winding of the B-phase current transformer on the low-voltage side, the transformer and the primary winding of the high-voltage side B-phase current transformer;
三相大电流发生器的C相输出电流依次经低压侧C相电流互感器的一次绕组、变压器和高压侧C相电流互感器的一次绕组，流入大地；The C-phase output current of the three-phase large current generator flows into the earth through the primary winding of the C-phase current transformer on the low-voltage side, the transformer and the primary winding of the high-voltage side C-phase current transformer;
S3、通过A相差动保护装置获取高、低压侧A相电流互感器的二次绕组的感应电流，通过B相差动保护装置获取高、低压侧B相电流互感器的二次绕组的感应电流，通过C相差动保护装置获取高、低压侧C相电流互感器的二次绕组的感应电流；S3. Obtain the induced current of the secondary winding of the A-phase current transformer on the high and low voltage sides through the A-phase differential protection device, and obtain the induced current of the secondary winding of the B-phase current transformer on the high and low-voltage sides through the B-phase differential protection device, Obtain the induced current of the secondary winding of the C-phase current transformer on the high and low-voltage sides through the C-phase differential protection device;
对于每个电流互感器的二次绕组的感应电流，当其不等于其理论值时，整定该电流互感器对应的差动保护装置的参数，使其等于其理论值；For the induced current of the secondary winding of each current transformer, when it is not equal to its theoretical value, set the parameters of the differential protection device corresponding to the current transformer to make it equal to its theoretical value;
否则，执行S4；Otherwise, execute S4;
S4、对于每相差动保护装置，当其获取的差电流不为0时，更改所述差动保护二次回路的接线方式，使该差电流为0；否则，执行S5；S4. For each phase differential protection device, when the obtained differential current is not 0, change the wiring mode of the differential protection secondary circuit to make the differential current 0; otherwise, perform S5;
S5、采用钳形相位表获取高、低压侧A相电流互感器的二次绕组的感应电流的相位、高、低压侧B相电流互感器的二次绕组的感应电流的相位和高、低压侧C相电流互感器的二次绕组的感应电流的相位；S5. Use a clamp phase meter to obtain the phase of the induced current of the secondary winding of the phase A current transformer on the high and low voltage sides, the phase of the induced current of the secondary winding of the phase B current transformer on the high and low voltage sides, and the phase of the induced current on the high and low voltage sides The phase of the induced current in the secondary winding of the C-phase current transformer;
对于高压侧A相电流互感器的二次绕组的感应电流的相位、高压侧B相电流互感器的二次绕组的感应电流的相位和高压侧C相电流互感器的二次绕组的感应电流的相位，当三者不为正相序时，更改所述差动保护二次回路的极性，直至三者为正相序；For the phase of the induced current of the secondary winding of the high-voltage side A-phase current transformer, the phase of the induced current of the secondary winding of the high-voltage side B-phase current transformer and the induced current of the secondary winding of the high-voltage side C-phase current transformer phase, when the three are not in positive phase sequence, change the polarity of the differential protection secondary circuit until the three are in positive phase sequence;
对于低压侧A相电流互感器的二次绕组的感应电流的相位、低压侧B相电流互感器的二次绕组的感应电流的相位和低压侧C相电流互感器的二次绕组的感应电流的相位，当三者不为正相序时，更改所述差动保护二次回路的极性，直至三者为正相序；For the phase of the induced current of the secondary winding of the low-voltage side A-phase current transformer, the phase of the induced current of the secondary winding of the low-voltage side B-phase current transformer and the induced current of the secondary winding of the low-voltage side C-phase current transformer phase, when the three are not in positive phase sequence, change the polarity of the differential protection secondary circuit until the three are in positive phase sequence;
当三相大电流发生器的输出电流不满足差动保护装置的测量精度时，所述校核方法包括：When the output current of the three-phase high-current generator does not meet the measurement accuracy of the differential protection device, the checking method includes:
S6、在待保护的变压器投产前，将变压器短接，并将变压器高压侧三相短路接地；S6. Before the transformer to be protected is put into production, short-circuit the transformer and short-circuit the three-phase high-voltage side of the transformer to ground;
S7、采用三相大电流发生器对变压器的低压侧施加三相电流；S7. Use a three-phase large current generator to apply three-phase current to the low-voltage side of the transformer;
三相大电流发生器的A相输出电流依次经低压侧A相电流互感器的一次绕组和高压侧A相电流互感器的一次绕组，流入大地；The A-phase output current of the three-phase high-current generator flows into the ground through the primary winding of the low-voltage side A-phase current transformer and the primary winding of the high-voltage side A-phase current transformer;
三相大电流发生器的B相输出电流依次经低压侧B相电流互感器的一次绕组和高压侧B相电流互感器的一次绕组，流入大地；The B-phase output current of the three-phase high-current generator flows into the earth through the primary winding of the B-phase current transformer on the low-voltage side and the primary winding of the B-phase current transformer on the high-voltage side;
三相大电流发生器的C相输出电流依次经低压侧C相电流互感器的一次绕组和高压侧C相电流互感器的一次绕组，流入大地；The C-phase output current of the three-phase high-current generator flows into the earth through the primary winding of the C-phase current transformer on the low-voltage side and the primary winding of the C-phase current transformer on the high-voltage side in turn;
S8、通过A相差动保护装置获取高、低压侧A相电流互感器的二次绕组的感应电流，通过B相差动保护装置获取高、低压侧B相电流互感器的二次绕组的感应电流，通过C相差动保护装置获取高、低压侧C相电流互感器的二次绕组的感应电流；S8. Obtain the induced current of the secondary winding of the phase A current transformer on the high and low side through the phase A differential protection device, and obtain the induced current of the secondary winding of the phase B current transformer on the high and low side through the phase B differential protection device, Obtain the induced current of the secondary winding of the C-phase current transformer on the high and low-voltage sides through the C-phase differential protection device;
A相差动保护装置、B相差动保护装置和C相差动保护装置需采用YY接线；A phase differential protection device, B phase differential protection device and C phase differential protection device need to use YY wiring;
对于每个电流互感器的二次绕组的感应电流，当其不等于其理论值时，整定该电流互感器对应的差动保护装置的参数，使其等于其理论值；For the induced current of the secondary winding of each current transformer, when it is not equal to its theoretical value, set the parameters of the differential protection device corresponding to the current transformer to make it equal to its theoretical value;
否则，执行S9；Otherwise, execute S9;
S9、对于每相差动保护装置，当其获取的差电流不为0时，更改所述差动保护二次回路的接线方式，使该差电流为0；否则，执行S10；S9. For each phase differential protection device, when the difference current obtained by the differential protection device is not 0, change the wiring mode of the secondary circuit of the differential protection so that the difference current is 0; otherwise, perform S10;
S10、采用钳形相位表获取高、低压侧A相电流互感器的二次绕组的感应电流的相位、高、低压侧B相电流互感器的二次绕组的感应电流的相位和高、低压侧C相电流互感器的二次绕组的感应电流的相位；S10. Use a clamp phase meter to obtain the phase of the induced current of the secondary winding of the phase A current transformer on the high and low sides, the phase of the induced current of the secondary winding of the phase B current transformer on the high and low sides, and the phase of the induced current on the high and low voltage sides The phase of the induced current in the secondary winding of the C-phase current transformer;
对于高压侧A相电流互感器的二次绕组的感应电流的相位、高压侧B相电流互感器的二次绕组的感应电流的相位和高压侧C相电流互感器的二次绕组的感应电流的相位，当三者不为正相序时，更改所述差动保护二次回路的极性，直至三者为正相序；For the phase of the induced current of the secondary winding of the high-voltage side A-phase current transformer, the phase of the induced current of the secondary winding of the high-voltage side B-phase current transformer and the induced current of the secondary winding of the high-voltage side C-phase current transformer phase, when the three are not in positive phase sequence, change the polarity of the differential protection secondary circuit until the three are in positive phase sequence;
对于低压侧A相电流互感器的二次绕组的感应电流的相位、低压侧B相电流互感器的二次绕组的感应电流的相位和低压侧C相电流互感器的二次绕组的感应电流的相位，当三者不为正相序时，更改所述差动保护二次回路的极性，直至三者为正相序。For the phase of the induced current of the secondary winding of the low-voltage side A-phase current transformer, the phase of the induced current of the secondary winding of the low-voltage side B-phase current transformer and the induced current of the secondary winding of the low-voltage side C-phase current transformer Phase, when the three are not in positive phase sequence, change the polarity of the differential protection secondary circuit until the three are in positive phase sequence.
作为优选的是，将变压器短接的方式为：将变压器低压侧三相套管断开，并采用短路线将变压器短接。Preferably, the method of short-circuiting the transformer is as follows: disconnecting the three-phase bushing on the low-voltage side of the transformer, and short-circuiting the transformer with a short-circuit line.
本发明所述的变压器差动保护二次回路的校核方法，通过在待保护的变压器的低压侧设置三相大电流发生器，解决了现有的因待保护的变压器的负荷电流过小而导致变压器差动保护电流互感器二次接线的带负荷测试无法进行的问题。采用本发明所述的变压器差动保护二次回路的校核方法，能够检测差动保护装置的参数设置是否正确，二次回路中电流互感器的极性是否正确，进而实现对变压器差动保护二次回路的校核。The method for checking the secondary circuit of transformer differential protection according to the present invention solves the problem of existing problems caused by the excessively small load current of the transformer to be protected by arranging a three-phase large current generator on the low-voltage side of the transformer to be protected. The problem that the load test of the secondary wiring of the transformer differential protection current transformer cannot be carried out. By adopting the checking method for the secondary circuit of the transformer differential protection according to the present invention, it can detect whether the parameter setting of the differential protection device is correct and whether the polarity of the current transformer in the secondary circuit is correct, thereby realizing the differential protection of the transformer. Check the secondary circuit.
附图说明Description of drawings
在下文中将基于实施例并参考附图来对本发明所述的变压器差动保护二次回路的校核方法进行更详细的描述，其中：Hereinafter, the method for checking the secondary circuit of the differential protection of a transformer according to the present invention will be described in more detail based on the embodiments and with reference to the accompanying drawings, wherein:
图1为当三相大电流发生器的输出电流满足差动保护装置的测量精度时，待保护的变压器的电气连接示意图，其中，1为三相大电流发生器，2为低压侧A相电流互感器，3为低压侧B相电流互感器，4为低压侧C相电流互感器，5为待保护的变压器，6为高压侧A相电流互感器，7为高压侧B相电流互感器，8为高压侧C相电流互感器。Figure 1 is a schematic diagram of the electrical connection of the transformer to be protected when the output current of the three-phase high-current generator meets the measurement accuracy of the differential protection device, wherein 1 is the three-phase high-current generator, and 2 is the low-voltage side A-phase current Transformer, 3 is the low-voltage side B-phase current transformer, 4 is the low-voltage side C-phase current transformer, 5 is the transformer to be protected, 6 is the high-voltage side A-phase current transformer, 7 is the high-voltage side B-phase current transformer, 8 is the C-phase current transformer on the high-voltage side.
具体实施方式Detailed ways
下面将结合附图对本发明所述的变压器差动保护二次回路的校核方法进一步说明。The method for checking the secondary circuit of the transformer differential protection according to the present invention will be further described below with reference to the accompanying drawings.
实施例：下面结合图1详细地说明本实施例。Embodiment: The present embodiment will be described in detail below with reference to FIG. 1 .
本实施例所述的变压器差动保护二次回路的校核方法基于三相大电流发生器实现；The method for checking the secondary circuit of the transformer differential protection described in this embodiment is implemented based on a three-phase high-current generator;
当三相大电流发生器的输出电流满足差动保护装置的测量精度时，所述校核方法包括：When the output current of the three-phase high-current generator meets the measurement accuracy of the differential protection device, the checking method includes:
S1、在待保护的变压器投产前，将其差动保护二次回路接好，并将变压器高压侧三相短路接地；S1. Before the transformer to be protected is put into production, connect its differential protection secondary circuit, and short-circuit the three-phase ground on the high-voltage side of the transformer;
S2、采用三相大电流发生器对变压器的低压侧施加三相电流；S2. Use a three-phase large current generator to apply three-phase current to the low-voltage side of the transformer;
三相大电流发生器的A相输出电流依次经低压侧A相电流互感器的一次绕组、变压器和高压侧A相电流互感器的一次绕组，流入大地；The A-phase output current of the three-phase high-current generator flows into the earth through the primary winding of the low-voltage side A-phase current transformer, the transformer and the primary winding of the high-voltage side A-phase current transformer;
三相大电流发生器的B相输出电流依次经低压侧B相电流互感器的一次绕组、变压器和高压侧B相电流互感器的一次绕组，流入大地；The B-phase output current of the three-phase high-current generator flows into the earth through the primary winding of the B-phase current transformer on the low-voltage side, the transformer and the primary winding of the high-voltage side B-phase current transformer;
三相大电流发生器的C相输出电流依次经低压侧C相电流互感器的一次绕组、变压器和高压侧C相电流互感器的一次绕组，流入大地；The C-phase output current of the three-phase large current generator flows into the earth through the primary winding of the C-phase current transformer on the low-voltage side, the transformer and the primary winding of the high-voltage side C-phase current transformer;
S3、通过A相差动保护装置获取高、低压侧A相电流互感器的二次绕组的感应电流，通过B相差动保护装置获取高、低压侧B相电流互感器的二次绕组的感应电流，通过C相差动保护装置获取高、低压侧C相电流互感器的二次绕组的感应电流；S3. Obtain the induced current of the secondary winding of the A-phase current transformer on the high and low voltage sides through the A-phase differential protection device, and obtain the induced current of the secondary winding of the B-phase current transformer on the high and low-voltage sides through the B-phase differential protection device, Obtain the induced current of the secondary winding of the C-phase current transformer on the high and low-voltage sides through the C-phase differential protection device;
对于每个电流互感器的二次绕组的感应电流，当其不等于其理论值时，整定该电流互感器对应的差动保护装置的参数，使其等于其理论值；For the induced current of the secondary winding of each current transformer, when it is not equal to its theoretical value, set the parameters of the differential protection device corresponding to the current transformer to make it equal to its theoretical value;
否则，执行S4；Otherwise, execute S4;
S4、对于每相差动保护装置，当其获取的差电流不为0时，更改所述差动保护二次回路的接线方式，使该差电流为0；否则，执行S5；S4. For each phase differential protection device, when the obtained differential current is not 0, change the wiring mode of the differential protection secondary circuit to make the differential current 0; otherwise, perform S5;
S5、采用钳形相位表获取高、低压侧A相电流互感器的二次绕组的感应电流的相位、高、低压侧B相电流互感器的二次绕组的感应电流的相位和高、低压侧C相电流互感器的二次绕组的感应电流的相位；S5. Use a clamp phase meter to obtain the phase of the induced current of the secondary winding of the phase A current transformer on the high and low voltage sides, the phase of the induced current of the secondary winding of the phase B current transformer on the high and low voltage sides, and the phase of the induced current on the high and low voltage sides The phase of the induced current in the secondary winding of the C-phase current transformer;
对于高压侧A相电流互感器的二次绕组的感应电流的相位、高压侧B相电流互感器的二次绕组的感应电流的相位和高压侧C相电流互感器的二次绕组的感应电流的相位，当三者不为正相序时，更改所述差动保护二次回路的极性，直至三者为正相序；For the phase of the induced current of the secondary winding of the high-voltage side A-phase current transformer, the phase of the induced current of the secondary winding of the high-voltage side B-phase current transformer and the induced current of the secondary winding of the high-voltage side C-phase current transformer phase, when the three are not in positive phase sequence, change the polarity of the differential protection secondary circuit until the three are in positive phase sequence;
对于低压侧A相电流互感器的二次绕组的感应电流的相位、低压侧B相电流互感器的二次绕组的感应电流的相位和低压侧C相电流互感器的二次绕组的感应电流的相位，当三者不为正相序时，更改所述差动保护二次回路的极性，直至三者为正相序；For the phase of the induced current of the secondary winding of the low-voltage side A-phase current transformer, the phase of the induced current of the secondary winding of the low-voltage side B-phase current transformer and the induced current of the secondary winding of the low-voltage side C-phase current transformer phase, when the three are not in positive phase sequence, change the polarity of the differential protection secondary circuit until the three are in positive phase sequence;
当三相大电流发生器的输出电流不满足差动保护装置的测量精度时，所述校核方法包括：When the output current of the three-phase high-current generator does not meet the measurement accuracy of the differential protection device, the checking method includes:
S6、在待保护的变压器投产前，将变压器短接，并将变压器高压侧三相短路接地；S6. Before the transformer to be protected is put into production, short-circuit the transformer and short-circuit the three-phase high-voltage side of the transformer to ground;
S7、采用三相大电流发生器对变压器的低压侧施加三相电流；S7. Use a three-phase large current generator to apply three-phase current to the low-voltage side of the transformer;
三相大电流发生器的A相输出电流依次经低压侧A相电流互感器的一次绕组和高压侧A相电流互感器的一次绕组，流入大地；The A-phase output current of the three-phase high-current generator flows into the ground through the primary winding of the low-voltage side A-phase current transformer and the primary winding of the high-voltage side A-phase current transformer;
三相大电流发生器的B相输出电流依次经低压侧B相电流互感器的一次绕组和高压侧B相电流互感器的一次绕组，流入大地；The B-phase output current of the three-phase high-current generator flows into the earth through the primary winding of the B-phase current transformer on the low-voltage side and the primary winding of the B-phase current transformer on the high-voltage side;
三相大电流发生器的C相输出电流依次经低压侧C相电流互感器的一次绕组和高压侧C相电流互感器的一次绕组，流入大地；The C-phase output current of the three-phase high-current generator flows into the earth through the primary winding of the C-phase current transformer on the low-voltage side and the primary winding of the C-phase current transformer on the high-voltage side in turn;
S8、通过A相差动保护装置获取高、低压侧A相电流互感器的二次绕组的感应电流，通过B相差动保护装置获取高、低压侧B相电流互感器的二次绕组的感应电流，通过C相差动保护装置获取高、低压侧C相电流互感器的二次绕组的感应电流；S8. Obtain the induced current of the secondary winding of the phase A current transformer on the high and low side through the phase A differential protection device, and obtain the induced current of the secondary winding of the phase B current transformer on the high and low side through the phase B differential protection device, Obtain the induced current of the secondary winding of the C-phase current transformer on the high and low-voltage sides through the C-phase differential protection device;
A相差动保护装置、B相差动保护装置和C相差动保护装置需采用YY接线；A phase differential protection device, B phase differential protection device and C phase differential protection device need to use YY wiring;
对于每个电流互感器的二次绕组的感应电流，当其不等于其理论值时，整定该电流互感器对应的差动保护装置的参数，使其等于其理论值；For the induced current of the secondary winding of each current transformer, when it is not equal to its theoretical value, set the parameters of the differential protection device corresponding to the current transformer to make it equal to its theoretical value;
否则，执行S9；Otherwise, execute S9;
S9、对于每相差动保护装置，当其获取的差电流不为0时，更改所述差动保护二次回路的接线方式，使该差电流为0；否则，执行S10；S9. For each phase differential protection device, when the difference current obtained by the differential protection device is not 0, change the wiring mode of the secondary circuit of the differential protection so that the difference current is 0; otherwise, perform S10;
S10、采用钳形相位表获取高、低压侧A相电流互感器的二次绕组的感应电流的相位、高、低压侧B相电流互感器的二次绕组的感应电流的相位和高、低压侧C相电流互感器的二次绕组的感应电流的相位；S10. Use a clamp phase meter to obtain the phase of the induced current of the secondary winding of the phase A current transformer on the high and low sides, the phase of the induced current of the secondary winding of the phase B current transformer on the high and low sides, and the phase of the induced current on the high and low voltage sides The phase of the induced current in the secondary winding of the C-phase current transformer;
对于高压侧A相电流互感器的二次绕组的感应电流的相位、高压侧B相电流互感器的二次绕组的感应电流的相位和高压侧C相电流互感器的二次绕组的感应电流的相位，当三者不为正相序时，更改所述差动保护二次回路的极性，直至三者为正相序；For the phase of the induced current of the secondary winding of the high-voltage side A-phase current transformer, the phase of the induced current of the secondary winding of the high-voltage side B-phase current transformer and the induced current of the secondary winding of the high-voltage side C-phase current transformer phase, when the three are not in positive phase sequence, change the polarity of the differential protection secondary circuit until the three are in positive phase sequence;
对于低压侧A相电流互感器的二次绕组的感应电流的相位、低压侧B相电流互感器的二次绕组的感应电流的相位和低压侧C相电流互感器的二次绕组的感应电流的相位，当三者不为正相序时，更改所述差动保护二次回路的极性，直至三者为正相序。For the phase of the induced current of the secondary winding of the low-voltage side A-phase current transformer, the phase of the induced current of the secondary winding of the low-voltage side B-phase current transformer and the induced current of the secondary winding of the low-voltage side C-phase current transformer Phase, when the three are not in positive phase sequence, change the polarity of the differential protection secondary circuit until the three are in positive phase sequence.
将变压器短接的方式为：将变压器低压侧三相套管断开，并采用短路线将变压器短接。The way to short-circuit the transformer is: disconnect the three-phase bushing on the low-voltage side of the transformer, and short-circuit the transformer with a short-circuit line.
本实施例所述的变压器差动保护二次回路的校核方法，因未投产的变压器未带出线负荷而不会影响对外供电。The method for checking the secondary circuit of the differential protection of the transformer described in this embodiment will not affect the external power supply because the transformer that has not been put into operation does not carry outgoing load.
采用本实施例所述的变压器差动保护二次回路的校核方法，能够有效地避免因变压器差动保护二次回路接线错误而导致差动保护装置错误动作。Using the method for checking the secondary circuit of the differential protection of the transformer described in this embodiment can effectively avoid the wrong action of the differential protection device caused by the wrong wiring of the secondary circuit of the differential protection of the transformer.
本实施例所述的变压器差动保护二次回路的校核方法还适用于对高、低压母线的差动保护二次回路进行校核。The method for checking the differential protection secondary circuit of the transformer described in this embodiment is also suitable for checking the differential protection secondary circuit of the high and low voltage busbars.
虽然在本文中参照了特定的实施方式来描述本发明，但是应该理解的是，这些实施例仅是本发明的原理和应用的示例。因此应该理解的是，可以对示例性的实施例进行许多修改，并且可以设计出其他的布置，只要不偏离所附权利要求所限定的本发明的精神和范围。应该理解的是，可以通过不同于原始权利要求所描述的方式来结合不同的从属权利要求和本文中所述的特征。还可以理解的是，结合单独实施例所描述的特征可以使用在其他所述实施例中。Although the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and other arrangements can be devised without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that the features described in the various dependent claims and herein may be combined in different ways than are described in the original claims. It will also be appreciated that features described in connection with a single embodiment may be used in other described embodiments.
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