Product Details
Product introduction
The Variable Frequency Resonance Device is designed and manufactured for alternating-current withstand voltage test of 110kV cable. The reactor is designed in more than one seperately, which not only can meet the test condition requirements for equipments with high voltage and low current, but also can meet requirements for low-voltage alternating-current withstand voltage test of 10kV cable. Possessing a wider application scope, it is the ideal withstand voltage equipment for prefecture-level, municipal-level and county-level high-voltage test departements as well as power installation and repair & testing engineering units.
Advantages for series resonance’s application in electric system:
1. The power capacity needed is reduced greatly. The series resonance power supply is used for generating high voltage and high current by making use of resonant reactor and capacitor resonance of test object; the power supply only needs to provide for parts with active consumption in the whole system; therefore, the power needed for test is only 1/Q of test capacity.
2. The weight and volume of equipment is reduced greatly. It does not only leave out the cumbersome high-power pressure regulating device and common high-power power frequency testing transformer in the series resonance power supply; furthermore, the resonant excitation power supply only needs 1/Q of test capacity, which is 1/10-1/30 of common test unit and reduces the system weight and volume greatly.
3. The waveform of output voltage is improved. The resonant power supply is filtering circuit of resonant mode, which can improve the waveform distortion of output voltage, obtain good sinusoidal waveform and effectively prevent the wrong breakdown of harmonics peak value to test object.
4. The large short-circuit current is prevented from burning fault point. When the insulation weakness of test object is broken down under series resonance condition, the circuit gets tuning-off immediately and the loop current reduces to 1/Q of normal test current rapidly. When the withstand voltage test is carried out by means of parallel resonance or testing transformer, the breakdown current can rise for dozens of times immediately; the short-circuit current and breakdown current differ for dozens of times by comparing them. Therefore, the series resonance can effectively find insulation weakness, meanwhile, there is not any worry for large short-circuit current to burn fault point.
5. There is not any restoring over-voltage. As the resonance condition will be lost when the test object is broken down, the high voltage will disappear immediately, the electric arc will burn out instantly; the restoring process of this voltage is a long intermittent oscillating process with energy accumulation, and power supply is easily cut off before reaching flashover voltage; furthermore, there is not any restoring over-voltage.
（Variable Frequency Resonance Device Workshop Figure）
Main technical parameters
1. Rated voltage:35kV---meeting the alternating current withstand voltage test for 110kV cable;
2. Waveform distortion rate of output voltage should be less than 1.0％.
3. The permissible continuous working time is to work for 5 minutes at one time under rated condition.
4. Quality factor of unit itself: Q>50
5. Quality factor under full load in test of fire power generator: Q>10 (relating to load)
6. Quality factor under full load in cable test: Q>30 (relating to load)
7. Quality factor under full load in test of main transformer: Q>30 (relating to load)
8. GIS, the quality factor under full load in switch test and other tests: Q>50 (relating to load)
9. Input power supply: single phase of 380V
10. Frequency adjustment range: 20Hz～300Hz
11. Accuracy of system measurement: 1.5％
12. The unit possesses protective functions, such as over voltage, over current and zero start.
Standards followed by equipment
Standard for Hand-Over Test of Electric Equipment and Electric Equipment Installation Engineering GB50150-2006
High-voltage Resonance Test Unit DL/T 849.6—2004
Reactor GB10229.88
Preventive Test Code for Electric Power Equipment DL/T596-1996
Coupling Capacitors and Capacitor Divider IEC358 (1990)
Careful guarantee
Products manufactured by our company can be replaced for any defect within 3 months after delivery date. Products can be repaired freely for any defect within one year (including one year). Products can enjoy a paid maintenance service for life for any defect over one year.
Safety requirements
Please read the following safety precautions to aviod personal injury and prevent this product or other connected products from being damaged. This product only can be used within the specified scope to avoid possible risk.
FAQ
Q: Can you do OEM and ODM?
A: Yes, OEM and ODM are both acceptable. The material, color, style can customize, the basic quantity we will advise after we discuss.
Q: When can I get the price?
A: Usually we quote within 24 hours after we get your inquiry.
Q: How long is your delivery time?
A: The general delivery time is 30 days after receiving your order confirmation.If we have the goods in stock, it will only take 10 days.
Q:What’s your after-sale service?
A: Our quality warranty period is one year. Any quality problem will be solved to customer satisfactions.
Q:Do you have QC department?
A:Yes,we have 6 QC persons
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