Wuhan Goldhome Hipot Electrical Co., Ltd. is one of the leading manufacturers and suppliers of 300kva/300kv pd-free power frequency ac hipot tester in China. With abundant experience, our factory offer high quality customized products made in China with competitive price. Welcome to contact us for quotation.
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Products Description
The HM-YDJW-300kVA/300kV applies an adjustable power-frequency AC voltage of up to 300 kV to transformer insulation and other equipment rated below 300 kV, and measures partial discharge at the same time. The set is built for factory test floors rather than field work, so its specifications are aimed at repeatability: a stable supply, a fixed measurement chain and a recorded result for every test.
Five units make up the set - an automatic operation desk, an integrated power supply cabinet, the PD-free test transformer, a current-limiting resistor and a capacitive voltage divider. The cabinet consolidates the power isolation transformer, voltage regulator, isolation step-up filter and power compensation into one enclosure, which removes the external wiring between them and keeps the supply chain short.
For partial discharge work the environment matters as much as the equipment: the manual specifies a shielded room where possible, a supply harmonic component below 5%, and a single-point earth for both the desk and the transformer, bonded into the same earth network.
Capacity
300 kVA
Max voltage
300 kV
System PD
300 kV
Divider
687 : 1
Key features
Our advantage
300 kVA at 300 kV
Single-phase test transformer with insulated tank enclosure, 1 kV input and AC 0–300 kV output at 1.0 A.
Four functions in one cabinet
Power isolation transformer, voltage regulator, isolation step-up filter and power compensation share one enclosure instead of four.
Three-stage automatic test
Each stage carries its own voltage, hold time and boost speed, so a full sequence runs without operator input.
Measurement you can defend
300 kV divider with 1000 pF capacitance, 687:1 ratio, dielectric loss below 0.5% and class 1.5 accuracy.
PD-free chain end to end
The complete set is specified below 10 pC, with the supply harmonic component held under 5% and a shielded environment recommended.
Combination compensation
250 kVA compensation bank with 25 / 50 / 75 / 100 combinations, matched to the specimen's reactive demand.
Layered protection
Over-voltage at 1.1× the test value, low-voltage current, high-voltage leakage current and a flashover factor adjustable from 20% to 99%.
Reports to Excel
Every test can be saved and exported as an Excel report directly from the desk.
technical Parameter
| Parameter | Value |
|---|---|
| Test set | |
| Model | HM-YDJW-300kVA/300kV |
| Rated capacity | 300 kVA |
| Output voltage | AC 0–300 kV |
| Output current | 1.0 A |
| Frequency | 50 Hz |
| System partial discharge | <10 pC |
| Recommended supply quality | Harmonic component of test supply <5% |
| Operation desk | |
| Phase | Single-phase |
| Working power source | 220 V |
| Manual maximum voltage setting | 0–330 kV |
| Flashover factor setting | 20%–99%, typically 30% |
| Test transformer | |
| Structure | Insulated tank enclosure |
| Number of phases | Single-phase |
| Rated capacity / frequency | 300 kVA / 50 Hz |
| Input voltage | 1 kV |
| Output voltage / current | AC 0–300 kV / 1.0 A |
| Current-limiting resistor - HMRV-300kV/1-4 | |
| Rated voltage / current / frequency | 300 kV / 1 A / 50 Hz |
| Capacitive voltage divider - HMFRC-300kV/0.001µF | |
| Rated voltage / frequency | 300 kV / 50 Hz |
| Nominal capacitance | 1000 pF |
| Dielectric loss | <0.5% |
| Voltage ratio | 687:1 |
| Measuring accuracy | Class 1.5 |
| Environment | |
| Ambient temperature | −20 to +50 °C |
| Altitude | Below 2000 m |
| Relative humidity | <90% at 25 °C |
| Site atmosphere | No gas, steam, chemical dust or other explosive and corrosive media that seriously affect insulation |
Applications
Factory routine testing
Power-frequency withstand tests on equipment rated below 300 kV, run to a repeatable sequence with a recorded result each time.
Transformer insulation withstand
Applied voltage testing of transformer insulation, with the test voltage read from the 300 kV divider chain.
Partial discharge measurement
Discharge measurement alongside the withstand test, on a system specified below 10 pC end to end.
Safety Requirements
- Hang the grounding rod and discharge completely before touching the high-voltage side of the transformer or the capacitive divider
- All grounding is single-point; the desk and the transformer must be bonded into the same earth network
- The main loop supply capacity must meet the maximum output power of the set
- Do not tilt the equipment or operate it with insufficient oil
- Do not strike the high-voltage insulating bushing or the steel shell
- When moving between environments, allow a temperature difference below 25 °C and wait 12 hours before operation
- Keep water, ice and snow off the bushing and shell surfaces
- Press the emergency stop before approaching the transformer, the specimen or any connected device
- If the regulator is not at zero when power is applied, the system returns to zero automatically
FAQ
Q: What is the HM-YDJW-300kVA/300kV used for?
A: Factory testing of equipment rated below 300 kV, transformer insulation withstand voltage testing, and partial discharge measurement.
Q: What are the site requirements?
A: Ambient −20 to +50 °C, altitude below 2000 m, relative humidity below 90% at 25 °C, and a single-point earth for the desk and the transformer in the same earth network.
Q: Are test results recorded?
A: The desk stores test records and generates an Excel report. A report must be saved for each test, otherwise the record is overwritten by the next test.
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