Dual Canopy Mechanic Electrical Engineering Co., Ltd. is one of the leading manufacturers and suppliers of DC Hi-pot Test in China. Please feel free to wholesale discount products for sale here and get quotation from our factory. Customized orders are welcome.
What is DC Hi-pot Test?
The DC Hi-pot Test functions as a high-voltage direct current (HVDC) withstand voltage tester for evaluating DC insulation strength across power cables, motor windings, transformer bushings, switchgear, and similar apparatus. It works by applying a controlled DC test voltage to the equipment under evaluation and tracking how leakage current behaves-both in magnitude and over time. These current characteristics reveal whether the insulation can hold up under stress, and whether underlying degradation or localized defects exist.
Against AC withstand voltage alternatives, the DC approach brings tangible field advantages. The hardware stays more compact, draws less power, and shows reduced sensitivity to the quality of available site supply. Technicians can transport it quickly and put it to work in settings where mains capacity is limited or where setup speed matters.
What products are applicable to?
HVDC Cable: Insulation verification for high-voltage DC transmission projects.
XLPE Cable (Note: Applicability must be determined in accordance with industry standards).
Motor/Generator Windings: Stator winding insulation withstand voltage test and evaluation.
Transformer Windings and Bushings: DC withstand voltage and insulation condition assessment.
Switchgear and Control Devices: Insulation verification and acceptance testing.
Capacitors/Surge Arresters: Insulation characteristic verification and factory inspection.
Insulation Materials/Components Quality Inspection: Manufacturer's factory inspection and research applications.
What precautions should be taken during use?
Strictly implement power outage and isolation: The object under test must be disconnected from the operating system. Verify voltage, connect a grounding wire, and affix a tag. Strictly implement safety measures.
Ground before connecting high voltage: The wiring sequence must be standardized; voltage increase is strictly prohibited when the high-voltage end is not connected.
Fully discharge before disconnecting: DC high voltage will accumulate charge in capacitive insulation. Discharge must be complete (multiple discharges and waiting are recommended). Disconnect only after confirming the residual voltage is zero.
Set a reasonable leakage current threshold: Too sensitive a threshold may trigger alarms due to humidity or surface contamination; too lenient a threshold may result in missed detections. It is recommended to set the threshold based on regulations and historical data.
Observe carefully during voltage increase: Sudden current changes, unstable increases, or exceeding limits are abnormal signals. The test should be stopped immediately and the problem investigated.
Note the applicability of XLPE cables: Before using DC withstand voltage on XLPE cables, confirm that they meet the latest regulations.
Single-person operation is strictly prohibited: High-voltage tests must be performed by two people (operator + supervisor). Safety barriers and warning signs must be set up.
Record environmental conditions: Temperature, humidity, and test sample temperature have a significant impact on the results; these must be recorded.
FAQ
Q1: What are the main differences between DC Hi-pot Test and AC Hi-pot Test?
A: DC withstand voltage testing equipment is lighter and requires less power capacity, providing more direct leakage current monitoring; AC withstand voltage testing more closely approximates operating conditions and is suitable for various scenarios.
Q2: Is a DC Hi-pot Tester suitable for testing XLPE cables?
A: The applicability of DC withstand voltage testing for XLPE cables needs to be determined in conjunction with the latest regulations (this is a matter of discussion within the industry). It is recommended to confirm the applicable standard before selecting the test method.
Q3: At what leakage current level does an insulation problem indicate?
A: There is no unified standard. A comprehensive judgment must be made based on equipment type, voltage level, historical data, and regulatory limits; trend changes are more important than single absolute values.
Our address
Baoding Cloud Center, Hebei, China
Phone Number
+86 13483219412
Salesm@dualcanopy.com
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Product Models and Technical Parameters
|
Voltage (KV)/ Current (mA) |
Control Box |
High-Voltage Unit |
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|
Rated Voltage |
Size (mm) |
Weight kg |
Size (mm) |
Weight kg |
|
|
60/2-10 |
60KV |
310 * 250 * 240 |
7kg |
470 * 260 * 220 |
5kg |
|
80/2-10 |
80KV |
310 * 250 * 240 |
7kg |
490*260*220 |
5kg |
|
100/2-5 |
100KV |
310 * 250 * 240 |
7kg |
550*260*220 |
5kg |
|
120/2-5 |
120KV |
310 * 250 * 240 |
7kg |
600 * 260 * 220 |
6kg |
|
200/2-5 |
200KV |
310 * 250 * 230 |
8kg |
1000 * 280 * 270 |
13kg |
|
250/2-5 |
250kV |
310 * 250 * 270 |
8kg |
218*100*1065 |
14 kg |
|
300/2-5 |
300kV |
310 * 250 * 270 |
9kg |
218*100*1300 |
18kg |
|
350/2-5 |
350kV |
310 * 250 * 270 |
9kg |
218*100*1340 |
18 kg |
|
output polarity |
Negative polarity, no-voltage start, linear continuous adjustment |
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|
working power supply |
50HZ AC220V±10% |
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|
voltage error |
0.5%±2,minimum solution 0.1KV |
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|
current error |
0.5%±2,minimum solution 0.1µA |
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|
ripple factor |
better than 0.5% |
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|
voltage stability |
Random fluctuation |
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working manner |
Interval working, less than 30 minutes under rated load |
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|
working condition |
Temperature: 0-40℃, humidity: less than 90% |
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|
storage condition |
Temperature: -10℃～40℃, humidity: less than 90% |
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altitude |
Lower than 3000 m |
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size= grading shield diameter(R)*insulating cylinder(r)*total height(H)
