"Several times" series resonance

Series resonance basic concept:

It is divided into frequency modulation type and adjustment type. It is generally composed of variable frequency power supply, excitation transformer, reactor and capacitive voltage divider. The capacitor and reactor of the test object form a series resonant connection; the voltage divider is connected in parallel to the test object, and is used to measure the resonant voltage on the test object and to perform an overvoltage protection signal.

Series resonance principle:

Q is a system quality factor, that is, a voltage resonance multiple, which is generally several tens to one hundred or more. First, by adjusting the output frequency of the variable frequency power supply, the series resonance of the loop occurs, and then the output voltage of the variable frequency power supply is adjusted under the condition of loop resonance so that the voltage of the sample reaches the test value. Due to the resonance of the loop, a smaller output voltage of the variable frequency power supply can produce a higher test voltage on the test sample CX.

Series Resonance Technical Specifications:

1, the overall technical specifications

Output test voltage: 0～1000kV AC RMS

Output test current: 1～10A AC RMS

Output frequency: 20～300Hz

Resonant voltage waveform: Sine wave, waveform distortion rate: <1%

Tested varieties: all kinds of power transformers, power cables, generators, GIS and other equipment.

Work system: 30 minutes of continuous working time at full power output

Quality factor: 20 to 80, depending on different load conditions

Input operating power: 220V, 50Hz.

Ambient temperature: 0°C～+40°C

Relative Humidity: <95%RH, no condensation

Altitude: 2000m or less

The whole set of test equipment can be determined by the use of single or multiple resonant reactors in series or in parallel depending on the capacitance of the tested product.

2. Technical specifications of major components

(1) Frequency conversion control unit

Input operating power: 220V, 50Hz, current 5 ~ 250A

Output voltage and current: 0-250V, current 5-250A

Output frequency: 20 ~ 300Hz,

Frequency adjustment fineness: 0.1Hz

The maximum output power: 5 ~ 10000kVA

(2) Excitation transformer

Input operating power: 250V current 5 ~ 250A

Output voltage and current: 0 ~ 10kV, current 1 ~ 10A

Rated capacity: 5 to 50000 kVA

(3) Resonant reactor: (Technical specifications for each resonator)

Single reactor rated working voltage: 20kV, 40kV, 60kV (effective value)

Single rated working current: 1~10A (effective value)

(4) Capacitor divider

Working method: Purely capacitive

Rated voltage: 20kV, 60kV, 100kV, 200kV, 500kV, 1000kV RMS

Working frequency: 30～300Hz

Measurement error: <1%

Capacitance: 1000pF±5%

Voltage divider low voltage arm voltage: 100V