Product introduction
YDQ 5kVA AC DC hipot tester is a special high-voltage transformer that uses high insulation strength gas (usually sulfur hexafluoride (SF₆)) as the main insulation medium. It has become the mainstream equipment for modern high-voltage insulation testing, especially on-site testing, due to its outstanding advantages of being lightweight, efficient, safe, and maintenance free. It represents an important trend in the development of high-voltage testing equipment towards miniaturization, oil-free, and high reliability. Despite challenges such as high sealing requirements and SF₆ gas environmental issues, its comprehensive advantages make it an irreplaceable player in the power industry.
Product advantages
1. Small size and light weight: This is YDQ 5kVA AC DC hipot tester most significant advantage. Compared to oil immersed transformers of the same voltage level, its volume and weight can be reduced by 20% -60%, making it very suitable for situations that require frequent movement and on-site operations.
2. Excellent insulation performance: SF ₆ gas has high dielectric strength and stable performance, which can effectively prevent internal discharge.
3. Oil free design, safe and clean: eliminates potential oil leakage, fire and environmental pollution problems of oil immersed transformers, especially suitable for use in indoor, subway, mining and other places with strict fire prevention requirements.
4. Easy maintenance: Due to its fully sealed structure, there is basically no need for maintenance in daily use, saving the trouble of handling insulation oil.
5. Good electrical performance: good output voltage waveform and high stability.
Technical parameters
|
Voltage class |
10kV-300kV |
|
Capacity range |
1-500kVA |
|
Impedance voltage |
≤8% |
|
No-load current |
＜7% |
|
Product type |
AC, AC&DC, AC cascade, AC DC cascade. |
Main product specifications
| specifications and models | capacity(kVA) | High Voltage(kV) | High tension current(mA) | low input voltage converter | bend-beam-rheometer | temperature rise℃(30 minutes) | |
| voltage(V) | electricity(A) | ||||||
| YDQ-1.5/50 | 1.5 | 50 | 30 | 200 | 7.5 | 500 | 10 |
| YDQ-3/50 | 3 | 50 | 60 | 200 | 15 | 500 | 10 |
| YDQ-5/50 | 5 | 50 | 100 | 200 | 25 | 500 | 10 |
| YDQ-10/50 | 10 | 50 | 200 | 200 | 50 | 500 | 10 |
| YDQ-20/50 | 20 | 50 | 400 | 400 | 53 | 500 | 10 |
| YDQ-30/50 | 30 | 50 | 600 | 400 | 79 | 500 | 10 |
working principle of 5kVA AC DC hipot tester
Its fundamental principle is the same as that of a conventional transformer, which is electromagnetic induction.
A lower power-frequency voltage (e.g., 200V or 400V) is applied to the transformer's low-voltage winding.
Through electromagnetic induction, a much higher voltage (e.g., 50kV, 100kV, 300kV, or even higher) proportional to the turns ratio is induced in the high-voltage winding.
This high voltage is brought out and applied to the equipment under test. The equipment is observed to see if it breaks down within a specified time period, thus determining whether its insulation strength is qualified.
The exceptional insulating properties of SF₆ gas make it possible to achieve high-voltage insulation within a compact space, which is the fundamental reason for its small size.
Application Scenarios of YDQ 5kVA AC DC hipot tester
1, Manufacturing and Maintenance of Power Equipment
1. Handover test and preventive test of power plant and substation equipment:
Power transformer: Conduct power frequency AC withstand voltage test and DC withstand voltage test to check the strength of the main insulation and longitudinal insulation.
High voltage switches (circuit breakers, isolating switches, GIS combination devices): Conduct a voltage withstand test between the broken and conductive parts and the ground to verify their insulation performance.
Power cables: Conducting DC withstand voltage tests and measuring leakage current is an important means of inspecting the insulation condition of cables after installation.
Transformer (CT/PT): Conduct power frequency withstand voltage test to ensure its insulation meets operational requirements.
Lightning arrester: Conduct DC reference voltage test and leakage current test.
2. High voltage electrical equipment manufacturers:
As a factory inspection equipment on the production line, strict voltage withstand tests are conducted on every switch, transformer, mutual inductance and other product produced to ensure that the product quality meets national and international standards.
2, Research institutes and laboratories
Higher education institutions and high-voltage laboratories: used for teaching demonstrations of high-voltage technology and research on the electrical properties of various insulation materials, such as the breakdown characteristics of gases and the voltage resistance of solid insulation materials.
Research institution: Provide high-voltage test power supply for the development of new power equipment or insulation technology, used to simulate insulation tests under various operating conditions.
3, Specific industries and industrial sectors
Rail transit: used for insulation testing of electrical systems such as locomotives, high-speed rail traction transformers, high-voltage cables, pantographs, etc.
Shipbuilding and aerospace industry: used for insulation performance testing of electrical equipment for ships or aviation.
Mining and petrochemical industries: used in places with harsh environments and special requirements for equipment fire and explosion prevention.
Frequently Asked Questions
1. What is the difference between YDQ 5kVA AC DC hipot testers and oil immersed test transformers?
The inflatable 5kVA AC DC hipot tester uses SF ₆ gas as the insulation medium, which has the characteristics of small volume, light weight, good insulation performance, and no risk of oil leakage. Compared to oil immersed test transformers, it is more suitable for on-site mobile testing and use in high-altitude areas.
2. What testing projects is this 5kVA AC DC hipot tester suitable for?
Mainly used for:
Power Transformer Power Frequency Withstand Voltage Test
Cable AC voltage withstand test
Voltage withstand test of switchgear
GIS equipment withstand voltage test
Insulation test for motors and capacitors
Factory delivery and on-site handover test of power equipment
3. Why use SF ₆ gas insulation?
SF ₆ gas has excellent insulation and arc extinguishing properties, with insulation strength about 2-3 times that of air. Therefore, it can effectively reduce equipment volume, improve operational stability and safety.
4. Is the YDQ 5kVA AC DC hipot tester easy to transport and use on site?
Yes.
Compared with oil immersed test transformers of the same voltage level:
lighter in weight
Smaller volume
Convenient to transport
Quick installation
Especially suitable for on-site power testing and mobile inspection.
5. Can the YDQ 5kVA AC DC hipot tester be used in conjunction with a series resonant system?
Okay.
Inflatable 5kVA AC DC hipot test sets can be used as excitation transformers for series resonance test systems and are widely used in:
AC voltage withstand test for power cables
GIS AC withstand voltage test
Generator AC voltage withstand test
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