Power Frequency AC Resonant Test System For EHV CVT And CB Rutine Testing

V. General Technical data:

1. Mode of resonant circuit: Series resonant with variable inductance
2. System model : made by order
3. Input power supply : 380±10%(single-phase),50Hz/60Hz
4. Rated output capacity: made by order
5. Rated output Voltage:no more than 800KV
6. Rated output current: made by order
7. PD level itself: no more than 10pC
8. Reg. Freq range : 50/60Hz
9. Output Resonance voltage waveform: pure sine wave
10. THD of output waveform: ≤1%
11. Insulation level: Under 1.1 times and keeping 1min, normal
12. Duty cycle : 30mins on under rated current working condition ;
13. Quality factor of test set itself: Q≥30 ;
14. Temperature rise: Less than 65K under rated current working 30mints;
15. Noise level: No more than 65dB
16. Reactor Structure: oil-immersed with iron tank type ,adjustable inducatance

1. Reactive power full compensated, the power of the equipment and power is only less than 1/10 of measured equipment; with smaller volume and lighter compared with the equipment in same capacity.
2. With large output capacity and small power capacity, low cost, easy to operate and keep safe.
3. Typical current filter circuit, the output voltage distortion (THD) is very small
4. The short circuit current after flashover or breakdown is only less than 1/10 (1/Q) of the measured current, can effectively prevent the damage to fault point after breakdown.
5. Auto blowout the arc after flashover, it is a long and stable process to recover the serial resonant voltage, safe.

VII. Function

1. Remote control and indication function for the iron-core gap of reactor:The gap sensor is installed in the reactor, which directly reads the iron-core gap on the console to guide operation. The gap limiting switch and indicator are also installed.
2. Auto step down function when withstanding time is up:Withstanding timing adopts digimatic timer. When withstanding time is up, the system will auto step down.
3. Zero position close, zero start step up function:With zero limiting function. If the voltage regulator is not at zero position, then the HV output button cannot be closed, assuring the system step up from zero.
4. Over current protection:The system is with over current relay, which is of high anti interference, fast action, protection test object against over-current damage.
5. Over voltage and test object flash-over protection functions:This system takes electronic over voltage and flash-over protection board, protects test object against over voltage and flash-over. It is fast, stable and reliable, overcoming the instability, large discreteness and inconvenient adjustment of sphere-gap protection voltage. The setting of over voltage protection is manual adjustment, digital display, which is direct, convenient and accurate. The flash-over protection samples the accident variance of discharging signal falling delay, compares it with basic signal and determines. It is of high accuracy, avoiding possible mistake movement by accident variance of rising delay.
6. Real-time monitor function for test data:It is able to monitor HV side voltage, current and LV side voltage, current, which is more direct viewing the test status.
7. Digital display of circuit resonance and locking function when it is not of resonance and step up:
8. It can directly display the resonance status of the system by power factor. If the system is not at the resonant point, it must press close button to step up. When the system is adjusted to resonance, release the close button, click on the step up/down button to step up or step down.
9. Emergency stop :“Step on” emergency brake switch. Once there is abnormal conditions during test, step on this switch, the main power will be cut off right away to protect the safety of the testing personnel and the equipment.

VIII.Accessories

• Accessory box for storage accessoires
• Connection cables of control console and Voltage regulator
• Connection cables of voltage ragulator and exciting transformer
• Output cables of exciting transformer
• System grounding cables
• Parallel cables of the reactor
• HV output cables(reactor to divide,divider to test object)
• HV measuring cables ( the signal output cables of voltage divider )
• A final test report, a quality Certificate ,a user manual and a packing list are offered .

IX. Optional model