Discharge coil excitation characteristic test loop

Abstract

The invention discloses a discharge coil excitation characteristic test loop comprising a voltage regulator, a switch, a voltmeter, a boosting transformer, an ammeter, a voltage divider, a current sensor and a signal acquisition device. The switch is additionally arranged at the output end of the voltage regulator so that the voltage regulating end of the voltage regulator is regulated by disconnecting the switch when one test period ends, a situation that a discharge coil continuously bears high voltage and high current in the whole test process within the period of time can be avoided, the thermal, vibration and other adverse effects of the discharge coil can be decreased, and range of excitation characteristic testing can be extended.

Description

technical field [0001] The invention relates to the field of electrical technology, in particular to a test circuit for the excitation characteristic of a discharge coil. Background technique [0002] The high-voltage shunt capacitor device is an important reactive power compensation device in the power grid. In the ungrounded system, both ends of the capacitor are connected in parallel and connected to the discharge coil. After the capacitor is switched off, the residual charge at both ends must be discharged by the discharge coil. The process of the discharge coil discharging the capacitor charge is closely related to the opening overvoltage of the shunt capacitor. After the capacitor switch is disconnected, the polarity of the voltage on the capacitor is likely to be opposite to that of the system voltage, causing the switch to generate a high recovery overvoltage. It is related to the shock, and the overvoltage of the switch can be calculated through the discharge coil ...

AI Technical Summary

Problems solved by technology

[0005] Due to the continuous adjustment characteristics of the voltage regulator TV, when setting a higher test voltage Uh, it is necessary to adjust the voltage regulator TV from a lower voltage to Uh, then perform data recording, and then drop the voltage, so the discharge coil Withstanding high voltage and high current for a long time, when Uh is too high, the discharge coil enters a saturated state, the current is large, and the iron core vibrates. Maintaining a saturated state for a long time may cause its winding to be damaged due to heat and vibration

therefore, figure 1 The test range of the method is relatively limited

In addition, the voltage range of the excitation characteristics of the discharge coil provided by the current manufacturer is generally 1.5 times the rated voltage. This voltage corresponds to a current passing through the discharge coil of about tens of mA to 100 mA, which is too different from the current passing through the discharge coil during discharge. , resulting in a smaller test range

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