Overall calibration system and method for current transformer on-site calibrator

Abstract

The invention relates to an overall calibration system and method for a current transformer on-site calibrator, belongs to the technical field of transformer detection, and mainly solves the problem that various types of current transformer on-site calibrator overall calibration methods are not unified. The system comprises a current type current transformer on-site calibrator overall calibrationsystem, a voltage type current transformer on-site calibrator overall calibration system and an overall calibration management system. The current type current transformer on-site calibrator overall calibration system comprises a current proportion standard, a standard ammeter, a standard resistor, a standard capacitor and an uncompensated standard current transformer. The voltage type current transformer on-site calibrator overall calibration system comprises a voltage proportion standard, a standard voltmeter, a standard resistor, a standard capacitor and an uncompensated standard current transformer, a voltage proportion standard primary winding is a two-stage winding and is of a cascade structure, and a voltage proportion standard secondary winding is a multi-tap winding. A current proportion standard primary winding is a multi-tap winding, and a secondary winding is a two-stage winding.

Description

technical field [0001] The invention belongs to the technical field of transformer detection, and in particular relates to an overall verification system and a verification method of a current transformer on-site calibrator. Background technique [0002] The current transformer field calibrator is a standard instrument used for on-site verification or calibration of current transformers in power plants and substations in power systems. The calibrator, special load and other functional modules use corresponding algorithms, and the accuracy level of the instruments and equipment for on-site testing of current transformer errors is generally above 0.05. According to my country's "Measuring Law", the current transformer field calibrator as a standard measuring instrument must be traceable. At present, there is no corresponding verification procedure in my country to regulate its traceability verification work. According to the issued transformer verification regulations: JJG31...

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Problems solved by technology

According to the promulgated transformer verification regulations: JJG31-3-2010 "Current transformer for measurement" (hereinafter referred to as the regulation ①), JJG314-2010 "Voltage transformer for measurement" (hereinafter referred to as the regulation ②) and transformer calibration The instrument verification regulation JJG169-2010 "Transformer calibrator" (hereinafter referred to as the regulation ③) conducts traceability verification on the current transformer field calibrator, and there are the following problems: (1) Regulation ① and regulation ② stipulate the current transformer and voltage The current transformer and voltage transformer are verified by using the principle and method of the comparative difference measurement method for the transformer, but the working principle of the current transformer on-site calibrator is different, and it is not suitable for the methods of the regulations ① and ②; (2) the calibration of the current transformer The transformer calibrator is also different from the traditional transformer calibrator. As a transformer error measurement device, the traditional transformer calibrator must rely on supporting standard transformers, load boxes and other equipment to work, and its accuracy is level 2. , and the current transformer calibrator is a device that works through the built-in standard device and has been measured and calculated. Its accuracy is above 0.05, so it cannot be calibrated simply by the procedure ③; (3) Some current transformers are calibrated on site. The tester will be led out from the attached standard device and the calibrator through the corresponding terminals, and the included standard device and the included calibrator shall be verified respectively according to the regulations ① or the regulations ② and the regulations ③. This verification method is called sub-component verification. , there are also problems: not only different current transformer field calibrators have different verification methods, but also the sub-component verification is not equal to the overall verification; (4) when sub-component verification, the working status of the current transformer field calibrator is different from the The actual working conditions on site are different, and the on-site calibrator has to go through various parameter tests and data processing. Whether the processing results conform to its mathematical model and whether the algorithm is correct cannot be judged by divisional verification.

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