Ringing wave tolerance test
2018-07-23 12:12:38 SUSHI GUANGBO TEST TECHNOLOGY CO.,LTD 已读
Ringing wave tolerance test
Overview of Oscillation Wave Immunity
This standard mainly introduces the damped oscillatory wave immunity in the national standard GB/T17626.12:1998 (with new version) "Electromagnetic Compatibility Test and Measurement Technology Oscillation Wave Immunity Test". At the same time, the international standard IEC61000-4-18:2006 "Electromagnetic Compatibility Part 4: Test and Measurement Technology Part 12: Attenuation Oscillation Wave Immunity Test" is presented, and the changes in the contents of the new standard are introduced.
Analysis of the Type of Oscillation Wave Immunity
The damped oscillating wave phenomenon mainly represents the insulation switching of outdoor high and medium voltage substations, especially the switching of high voltage busbars and the background harassment of industrial devices.
The combined operation of the high-voltage insulator knife gate in the substation will cause a steep wave transient, which is on the order of several tens of ns.
Due to the characteristic impedance mismatch with the high voltage circuit, the voltage head will undergo evolution including reflection. From this point of view, the transient voltage and transient current in the high voltage bus are characterized by the fundamental frequency of the oscillation. The frequency depends on the circuit length and propagation time.
In outdoor substations, this oscillation frequency ranges from 100 kHz to several MHz, depending on the influence of the above parameters and the length of the busbar, the length of the busbar varies from tens of meters to several hundred meters (possibly up to 400 m). In this respect, the 1MHz oscillation frequency is considered to represent most cases, but for large high-voltage substations, the 100kHz oscillation frequency is more suitable.
The repetition rate varies from a few hertz to a few kilohertz, depending on the switch's electrical contact distance. Considering the different durations of this phenomenon, the applicability of different frequencies, and the energy that the circuit can withstand during the test, it is a compromise to choose a repetition rate of 40 times/s and 400 times/s.
Fast rise times, decaying oscillation waveforms, high repetition rates, and burst duration are the most important parameters in this test.
Typical interference waveforms and parameters
Voltage rise time (first peak)
100 kHz and 1 MHz ± 10%;
At least 40 times/s at 100 kHz; at least 400 times/s at 1 MHz;
Reduced to 50% of the peak between the third and sixth periods;
Not less than 2s;
Peak open circuit voltage
250V (-10%) to 2.5kV (+10%);
Phase relationship with power frequency
First cycle polarity
Positive and negative;
Oscillation wave immunity test
A. Performance is normal within the technical requirements limits.
B, function or performance temporarily reduced or lost, but can recover on its own.
C. Function or performance is temporarily reduced or lost, but requires operator intervention or system reset.
D. The function of the device (component) or software is damaged, or the data is lost, resulting in the loss or loss of the function of self-recovery or normal state.