Portable differential circuit calibrator and calibration method

Abstract

The invention discloses a portable differential circuit calibrator. A differential circuit is provided with two connecting terminals used for being connected with a current transformer. The calibratorcomprises a central processing module. The central processing module is electrically connected with a constant current source module, a man-machine interface module, a signal acquisition module and apower supply mechanism; and the constant current source module is connected with the connecting terminal through two output terminals, the constant current source module is electrically connected with the power supply mechanism, the man-machine interface module is electrically connected with a man-machine interaction mechanism, and the signal acquisition module comprises a current signal collector electrically connected with the output terminal and a temperature signal collector electrically connected with the constant current source module. According to the portable differential circuit calibrator and the calibration method provided by the invention, the calibration result accuracy and the calibration process efficiency are higher.

Description

technical field [0001] The invention relates to the technical field of current differential protection, in particular to a portable differential circuit calibrator and calibrating method. Background technique [0002] Current differential protection is a kind of protection in relay protection. It inputs the current vector difference at both ends of CT (current transformer), and activates the action element when it reaches the set action value. The protection range is between the two ends of the input CT (it can be electrical equipment such as lines, generators, motors, transformers, etc.), and it is generally used as the main protection. [0003] In the new power supply system, the current differential protection involves the coordination of the differential algorithm and the polarity of multiple current mutual secondary coils. In the handover test, the traditional method of testing the differential protection system takes a lot of time. And energy, and because the observat...

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Problems solved by technology

[0003] In the new power supply system, the current differential protection involves the coordination of the differential algorithm and the polarity of multiple current mutual secondary coils. In the handover test, the traditional method of testing the differential protection system takes a lot of time. And energy, and because the observation method is often used to combine the principle to infer the correctness of the polarity of the differential circuit, there is a certain risk

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