What equipment should be used for cable voltage withstand test
The AC Resonant Test System adopts the method of adjusting the frequency of the power supply to achieve resonance between the reactor and the tested capacitor,and obtains high voltage and large current on the tested object.
This is a new method and trend in high voltage testing,which has been widely used both domestically and internationally.The AC Resonant Test System adopts a dedicated SPWM digital waveform generation chip,with a frequency resolution of 16 bits.
The frequency fineness can reach 0.1Hz at 20-300Hz;Adopting orthogonal asynchronous fixed carrier modulation method to ensure good output waveform throughout the entire frequency range;The power section adopts IPM modules to ensure the stability and safety of the instrument at the minimum weight.
The AC Resonant Test System consists of a frequency modulation and voltage regulation power supply,excitation transformer,reactor,and capacitor voltage divider.AC withstand voltage test of 6kV-500kV high-voltage cross-linked cables;Power frequency withstand voltage test of 6kV-500kV transformer;AC withstand voltage test for GIS and SF6 switches;AC withstand voltage test for generators.
AC withstand voltage test for other power high-voltage equipment such as busbars,bushings,and transformers.We know that when the circuit frequency f=1/2π√LC,resonance occurs in the circuit,and the voltage on the test sample is Q times the output voltage of the excitation transformer high voltage terminal.Q is the system quality factor,which is the voltage resonance multiple,usually ranging from tens to hundreds or more.
First,adjust the output frequency of the variable frequency power supply to cause series resonance in the circuit,and then adjust the output voltage of the variable frequency power supply under the condition of circuit resonance to achieve the test value of the test sample voltage.
Due to the resonance of the circuit,a smaller output voltage of the variable frequency power supply can generate a higher test voltage on the test sample CX.Working power supply;220V/380V,50Hz Test capacity:30-30000KVA Test voltage:1000KV and below Resonance frequency range:20-300Hz Test voltage waveform:Sine wave waveform distortion rate less than or equal to 0.3%Test voltage accuracy:Level 1 frequency regulation:0.01Hz Protection response time:less than 1 microsecond The system has overvoltage protection,overcurrent protection,discharge protection,breakdown trip protection,and overheating protection.
The frequency conversion series resonance withstand voltage test device,frequency conversion series resonance withstand voltage equipment,power frequency resonance test device,frequency conversion series resonance test transformer,frequency conversion series resonance test system,frequency conversion series resonance withstand voltage test instrument,cable AC withstand voltage test device,series resonance device,series resonance withstand voltage equipment,GIS withstand voltage test device,etc.have passed strict type test identification by the national authoritative department-Electric Power Industry Electrical Equipment Quality Inspection and Testing Center(Wuhan High Voltage Research Institute),with reliable quality,ensuring the safety of test personnel,test objects,and test equipment themselves;Portable AC power frequency withstand voltage tester(composed of dry test transformer and control box)has a small volume and light weight;,Simple structure and high reliability;Can be conveniently used on site.
This is a new method and trend in high voltage testing,which has been widely used both domestically and internationally.The AC Resonant Test System adopts a dedicated SPWM digital waveform generation chip,with a frequency resolution of 16 bits.
The frequency fineness can reach 0.1Hz at 20-300Hz;Adopting orthogonal asynchronous fixed carrier modulation method to ensure good output waveform throughout the entire frequency range;The power section adopts IPM modules to ensure the stability and safety of the instrument at the minimum weight.
The AC Resonant Test System consists of a frequency modulation and voltage regulation power supply,excitation transformer,reactor,and capacitor voltage divider.AC withstand voltage test of 6kV-500kV high-voltage cross-linked cables;Power frequency withstand voltage test of 6kV-500kV transformer;AC withstand voltage test for GIS and SF6 switches;AC withstand voltage test for generators.
AC withstand voltage test for other power high-voltage equipment such as busbars,bushings,and transformers.We know that when the circuit frequency f=1/2π√LC,resonance occurs in the circuit,and the voltage on the test sample is Q times the output voltage of the excitation transformer high voltage terminal.Q is the system quality factor,which is the voltage resonance multiple,usually ranging from tens to hundreds or more.
First,adjust the output frequency of the variable frequency power supply to cause series resonance in the circuit,and then adjust the output voltage of the variable frequency power supply under the condition of circuit resonance to achieve the test value of the test sample voltage.
Due to the resonance of the circuit,a smaller output voltage of the variable frequency power supply can generate a higher test voltage on the test sample CX.Working power supply;220V/380V,50Hz Test capacity:30-30000KVA Test voltage:1000KV and below Resonance frequency range:20-300Hz Test voltage waveform:Sine wave waveform distortion rate less than or equal to 0.3%Test voltage accuracy:Level 1 frequency regulation:0.01Hz Protection response time:less than 1 microsecond The system has overvoltage protection,overcurrent protection,discharge protection,breakdown trip protection,and overheating protection.
The frequency conversion series resonance withstand voltage test device,frequency conversion series resonance withstand voltage equipment,power frequency resonance test device,frequency conversion series resonance test transformer,frequency conversion series resonance test system,frequency conversion series resonance withstand voltage test instrument,cable AC withstand voltage test device,series resonance device,series resonance withstand voltage equipment,GIS withstand voltage test device,etc.have passed strict type test identification by the national authoritative department-Electric Power Industry Electrical Equipment Quality Inspection and Testing Center(Wuhan High Voltage Research Institute),with reliable quality,ensuring the safety of test personnel,test objects,and test equipment themselves;Portable AC power frequency withstand voltage tester(composed of dry test transformer and control box)has a small volume and light weight;,Simple structure and high reliability;Can be conveniently used on site.
