Current supply device, and power equipment vector testing device and system

Abstract

The invention provides a current supply device, a power equipment vector testing device and a power equipment vector testing system. According to the current supply device, the power equipment vectortesting device and the power equipment vector testing system, existing parallelly-connected compensation capacitors are changed into a series compensation capacitor in a current supply device, since the resistance of a transformer is very small, the shown impedance is mainly reactance, and the reactance of a test loop can be reduced by connecting a capacitor in series in a test loop, therefore, the purpose of acquiring high test current by applying the same test voltage in the test period can be achieved; moreover, the impedance of the compensation capacitor is different from the impedance oftested power equipment, thereby avoiding the resonance caused by the same impedance during series connection, and being suitable for the vector test of a high-impedance transformer through the ingenious combination of the above means.

Description

technical field [0001] The present invention relates to the technical field of electric equipment vector testing, and more specifically, to a current supply device, electric equipment vector testing device and system. Background technique [0002] When the pre-commissioning relay protection phasor inspection test technology that simply adopts the principle of voltage regulator and step-up transformer is used in the field, it is greatly affected by the field power supply, and the output current and voltage are relatively limited. In the case of constant power supply capacity, outputting high voltage and outputting large current are contradictory. Generally, the construction power supply capacity of a substation is less than 200kVA, and it is unbearable to increase the capacity of test equipment without limit. The increase in equipment capacity also brings difficulties to the transportation of test equipment. [0003] When the simulated load of the test is inductive, the meth...

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Problems solved by technology

But for high-impedance power equipment, such as high-impedance transformers (determined according to voltage level and ct ratio, for example, for 500kV transformers, transformers with impedance greater than 500 ohms can be regarded as high-impedance transformers), this test method is difficult to be able to Satisfy the voltage and current required by the phasor test

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