By hvhipot 
AC voltage withstand series resonance test device? HV Hipot Electric Co., Ltd. specializes in producing AC withstand voltage series resonance test devices, with a wide range of product options. When looking for anAC withstand voltage series resonance test device, choose HV Hipot Electric Co., Ltd..
The primary task of substation equipment or railway traction substations in the power system, as well as some other high-voltage equipment in industrial and agricultural production, is to operate safely and reliably. Any malfunction or accident can affect the normal operation of industrial and agricultural production and even cause significant losses to the national economy. Therefore, high-voltage equipment operating in important systems (such as high-voltage electrical equipment in substations) must maintain a high degree of reliability during long-term use, and a series of tests must be conducted on the equipment according to the design specifications.
The AC withstand voltage series resonance test device is a series resonance test device that uses tuned inductors and load capacitors to generate power frequency series resonance and obtain power frequency test voltage. Series resonance consists of an isolation transformer, a frequency and voltage regulating power supply, an excitation transformer, a reactor, and a capacitive voltage divider. The capacitor and reactor of the test sample form a series resonant connection; The voltage divider is connected in parallel to the test sample to measure the resonant voltage on the test sample and provide an overvoltage protection signal; The frequency modulation power output is coupled to the series resonant circuit through an excitation transformer, providing excitation power for series resonance.
In the AC withstand voltage series resonance test device, for the LC series circuit, its resonance conditions are determined by three factors: L, S, f. If two of these conditions have been determined, the third quantity can be determined. Therefore, frequency modulation can be used to achieve circuit resonance, that is, to use inductance to compensate for the leading reactive power of capacitance.
Case: AC withstand voltage test of 110kV/630mm2, 1000m long cable, capacitance ≤ 0 2uF， The test voltage is 128kV.
Use two series connected reactors and fHV Hipot Electric Co., Ltd. parallel connected reactors, with an inductance of L=143 * 2/4=71.5H
Test frequency f=1/2 π√ LC=1/(2 × 3.14 × √ 71.5 × 0.2 × 10-6)=42Hz.
Test current I=2 π fCU Test=2 π × 42 × 0.2 × 10-6 × 128 × 103=6.7A
Table of Reactor Usage Relationship for AC Voltage Endurance Series Resonance Test Device
Summary: The selection result of the 110kV/630mm2, 1000m long cable is BPXZ-HT-1000kVA/500kV frequency modulation series resonance test device