DC Hipot Tester
1.High-Precision DC Output: Delivers stable, low-ripple voltage for accurate withstand & leakage current tests on cables and arresters.
2.Portable Field Design: Compact, lightweight structure fits in the included case—easy to carry for substation maintenance.
3.Comprehensive Safety: Built-in over-voltage, over-current, and zero-start protection ensures operator and equipment safety.
4.Wide Application: Essential for HV testing in power generation, transmission, and distribution departments.
Description
The ZGF DC High Voltage Generator is essential for DC withstand voltage and leakage current testing on HV equipment, power cables, and surge arresters. Designed for stability, it features advanced protection against specimen breakdown. Its split-unit design ensures operator safety by maintaining a secure distance from the high-voltage circuit during maintenance in power generation, transmission, and distribution sectors.
Product Feature
High Precision & Stability
Utilizes a high-frequency voltage doubling rectifier circuit to ensure stable output with minimal ripple. The simplified booster design enhances overall system reliability and measurement accuracy.
Portable & Lightweight Design
Engineered for field mobility. Even the largest capacity models (up to 200kV/2mA) are lightweight enough for a single operator to carry, making on-site testing efficient and effortless.
Robust Metal Enclosure
Features a fully sealed metal housing that provides superior mechanical strength and high insulation performance, protecting internal components from harsh environments.
Enhanced Safety Grounding
The high-voltage circuit is fully shielded by a grounded metal shell, ensuring maximum safety for operators during high-voltage applications.
Zero-Start Protection
Built-in interlock logic prevents accidental high-voltage output. The device will not start unless the voltage regulator is returned to the zero position, eliminating operational risks.
Precise Leakage Current Measurement
Equipped with a digital micro-ammeter on the HV side with high resolution, guaranteeing a measurement error of no more than ±1µA for accurate diagnostics.
Structural & Functional Highlights
Specialized MOA Testing: Equipped with a high-precision 0.75UDC 1mA button (Accuracy ≤1.0%), specifically designed for Zinc Oxide Arrester testing.
Digital Over-Voltage Protection: Features a digital DIP switch for precise and easy over-voltage setting.
Superior Insulation: The HV multiplier uses an electrical insulation cylinder with air insulation technology, ensuring zero leakage and high safety.
Field-Ready Portability: Both the control box and HV unit are housed in portable cases, designed for easy transport to field sites.
Technical Specifications
| Parameter | Unit | ZGF-120/5 | ZGF-200/3 | ZGF-200/5 | ZGF-300/2 | ZGF-300/5 |
| Rated Output Voltage | kV DC | 120 | 200 | 200 | 300 | 300 |
| Rated Output Current | mA | 5 | 3 | 5 | 2 | 5 |
| Rated Power | W | 600 | 600 | 1000 | 600 | 1500 |
| Control Box Weight | kg | 6.5 | 6.5 | 6.5 | 6.5 | 7.5 |
| HV Multiplier Weight | kg | 9.0 | 9.0 | 9.0 | 11.0 | 11.5 |
| HV Multiplier Height | mm | 970 | 970 | 970 | 1250 | 1250 |
| Voltage Accuracy | - | ±(1.0% Rdg ± 2 digits) | ||||
| Current Accuracy | - | ±(1.0% Rdg ± 2 digits) | ||||
| Ripple Coefficient | - | ≤ 0.5% | ||||
| Voltage Stability | - | ≤ 1% (with mains fluctuation ±10%) | ||||
| Overload Capacity | - | No-load: +10% for 10 min Charge Current: 1.25× Rated |
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| Input Power Supply | - | AC 220V ±10%, 50Hz, Single Phase | ||||
| Duty Cycle | - | Intermittent: Rated load 30 min; 1.1× Rated Voltage 10 min | ||||
| Capacitive Load | - | Unlimited (Charging current up to 1.5× Rated) | ||||
| Operating Environment | - | Temp: -10℃ ~ +40℃ Humidity: ≤85% RH (at 25℃, non-condensing) Altitude: < 1500m |
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Applications
Versatile DC High Voltage Testing for Critical Power Equipment
The ZGF Series DC Hipot Tester is widely used for DC withstand voltage and leakage current tests across power generation, transmission, and distribution networks. Key applications include:
Metal Oxide Surge Arresters (MOA): Perform precise 1mA reference voltage (U1mA) and 0.75U1mA leakage current tests to detect valve aging and moisture ingress.
Power Cables: Conduct DC high voltage testing on XLPE, paper-insulated, and oil-filled cables to identify insulation degradation and localized defects.
Transformers & Generators: Test the DC withstand voltage of stator windings, iron cores, and transformer bushings to evaluate overall insulation integrity.
High Voltage Switchgear: Inspect the insulation strength of circuit breaker arc-extinguishing chambers and support insulators to prevent flashover faults.
Industrial & Research Facilities: Ideal for preventive maintenance in heavy industries (metallurgy, petrochemicals) and high-voltage component testing in research institutes.
FAQ
Q1: What is the primary application of this DC Hipot Tester?
A: It is primarily used for DC withstand voltage and leakage current tests on high-voltage equipment. Common applications include testing Metal Oxide Surge Arresters (MOA), power cables, transformers, and generators in power generation, transmission, and distribution networks.
Q2: Does this equipment support MOA (Surge Arrester) testing?
A: Yes. The control box is equipped with a dedicated 0.75UDC 1mA button. It allows operators to quickly and accurately measure the reference voltage and leakage current of Zinc Oxide Arresters, which is essential for evaluating valve aging and moisture ingress.
Q3: Is the equipment safe to operate in the field?
A: Absolutely. Safety is built into the core design. It features a grounded metal shield for the HV circuit, over-voltage and over-current protection, and a zero-start interlock. The device will not start unless the voltage regulator is at the zero position, preventing accidental high-voltage output.
Q4: Can one person carry the ZGF DC Hipot Tester to the job site?
A: Yes. The ZGF series is specifically designed for field mobility. The control box and HV multiplier are separated, and even the highest capacity models (up to 200kV/2mA) are lightweight enough for a single operator to transport easily.
Q5: What kind of after-sales support and calibration do you provide?
A: We provide a 1-year warranty and full technical support. Every unit comes with a factory test report, and we can provide third-party calibration certificates (such as CNAS) upon request to ensure your testing accuracy meets international standards.
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