Circuit loop polarity measuring method for busbar protection double transformation

Abstract

The invention discloses a circuit loop polarity measuring method for busbar protection double transformation. The method comprises the following steps that: A, a component which needs to be transformed is make to be shut down; B, the current loop of the component is connected into a new busbar protection device; C, the component is made to operate again; D, the phase difference of the circuit loop of the component under a condition that the component connected into the new busbar protection device and the circuit loop of the component under a condition that the component connected into an original busbar protection device is measured through using a phase meter, if the phase difference is 0 degree, the polarity of the current loop is correct, and transformation of the component is terminated, and if the phase difference is 180 degree, the method enters step E; and E, the current loop newly connected into the new busbar protection device in the step B is inversely connected into the new busbar protection device, and step D is repeated. With the circuit loop polarity measuring method provided by the technical schemes of the invention adopted, an on-load test is not required to be performed at last, the correctness of the polarity of the circuit loop can be determined through comparing the phase difference of the polarity heads of TA secondary windings when the circuit loop of one component is connected into the busbar protection devices, and therefore, work efficiency and work quality can be greatly improved. The circuit loop polarity measuring method is applicable to the construction conditions of busbar protection double transformation.

Description

technical field [0001] The invention relates to the field of power circuit detection, in particular to a method for measuring the polarity of a current loop in dual transformation of busbar protection. Background technique [0002] The current circuit is the most important circuit in relay protection, and it is also the most error-prone circuit. A little carelessness may lead to major accidents. For the newly added busbar protection, it is necessary to collect the current of all components on the busbar. In order to ensure that the polarity of the current loop meets the requirements for commissioning, the usual practice is to use the load test method to determine the correctness of the TA loop wiring when new equipment is put into production. In this case, if there is an error in the wiring of the TA circuit, it can only be found during the load test. At this time, if the wiring needs to be changed, because it involves the test of the entire system, the time will be very ti...

AI Technical Summary

Problems solved by technology

This scheme is not applicable to the dual transformation of busbar protection

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