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Multi-channel direct measuring type transformer calibrator and calibration method

A transformer calibrator and measuring technology, which is applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve the problem that the transformer calibrator can only be calibrated at the same transformation ratio, and achieves a simple test circuit and is not easy to damage. Effect

Pending Publication Date: 2018-08-17
NANJING DANDICK ELECTRIC INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a multi-channel direct measurement transformer calibrator and calibrating method, which can solve the problem of single-phase test of existing transformer calibrator, need to use differential loop test and can only be used at the same time. Ratio verification problem

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  • Multi-channel direct measuring type transformer calibrator and calibration method
  • Multi-channel direct measuring type transformer calibrator and calibration method
  • Multi-channel direct measuring type transformer calibrator and calibration method

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Embodiment Construction

[0035] Such as figure 1 As shown, a multi-channel direct measurement transformer calibrator, including: DSP circuit, ARM circuit, LCD, keyboard, storage, RS232, power supply, 8-way sampling precision voltage transformer VT1 ~ VT8, 8-way sampling precision current Transformers TA1~TA8, 8-way sampling resistor Rc, 8-way voltage signal limiting circuit, 4-way voltage transformer / sensor signal selection relay group J1~J16, 4-way current transformer / sensor signal selection relay group J17~J24, 16 voltage program-controlled amplifier circuits V1~V8 and A1~A8, two 8-channel parallel sampling 16-bit A / D circuits V_A / D and A_A / D, 4 groups of range switching relay switching I / O expansion circuits V1_I / O, V2_I / O, A1_I / O and A2_I / O are all installed in a 4U standard aluminum alloy chassis; the DSP circuit is respectively connected to the ARM circuit, 16 voltage program-controlled amplifier circuits V1~V8 and A1~A8, and two 8-channel parallel sampling 16-bit A / D circuit V_A / D and A_A / D, ...

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Abstract

The invention discloses a multi-channel direct measuring type transformer calibrator and a calibration method, which can realize three-phase voltage plus zero-sequence voltage and three-phase currentplus zero-sequence current eight-way test object error calibration. A standard voltage or current transformer may differ in ratio of transformation from a voltage or current transformer under test, and results can be obtained simply by using software. Since secondary output voltages or currents of the voltage or current transformers are isolated and sampled by a precision transformer, the tester of the invention is not easily damaged in the case of flashover of the extra-high voltage, ultra-high voltage transformer error test. The test circuit is simple, and only the secondary output voltagesor current signals of the standard transformer and the transformer under test are connected to the instrument of the invention, without the need of an error of measurement test loop.

Description

technical field [0001] The invention relates to the technical field of electric energy measurement, in particular to a multi-channel direct measurement transformer calibrator and a calibrating method. Background technique [0002] At present, the error verification method of the traditional voltage (current) transformer is mainly based on the three verification regulations of JJG313-2010 "Current Transformer for Measurement", JJG314-2010 "Voltage Transformer for Measurement", and JJG1021-2007 "Power Transformer" . The verification method requires the use of standard voltage (current) transformers, transformer calibrators, voltage (current) transformer load boxes, and boost (boost current) devices. The core of the test method is that the standard voltage (current) transformer and the tested voltage (current) transformer are connected to form a difference measurement loop, and the transformer calibrator is used to measure the standard loop and the difference loop together, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/02
CPCG01R35/02
Inventor 顾红波
Owner NANJING DANDICK ELECTRIC INSTR