MEWOI-ZD Series AC/DC Hipot Test Sets
MEWOI-ZD transformer-type AC/DC hipot test sets: control unit plus oil, dry or gas-insulated HV transformer, 2–20kVA and up to 200kV, for withstand testing of transformers, switchgear, cables and insulating tools.
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Overview
A hipot (dielectric withstand) test applies a voltage well above normal operating voltage for a set time to prove that insulation will not break down. It is the most direct check of insulation strength for transformers, switchgear, cables, capacitors, insulating tools and live-line equipment such as hot sticks, gloves and bucket booms.
The MEWOI-ZD series pairs a control unit, which regulates and times the test and measures voltage and current, with a separate high-voltage test transformer. Transformers are available oil-insulated, dry-type or SF6 gas-insulated, and the control unit comes in case, bench or cabinet form across the ZD-A, ZD-M, ZD-D and ZD-P series. Ratings are built to order, typically 2–20kVA with HV outputs of 50, 100, 150 or 200kV, and both AC and DC (rectified) withstand tests are supported.
Key Specifications
| Specification | Value |
|---|---|
| Input | AC 220V or 380V |
| Control unit output | AC 0–250V or 0–430V; 5/10/15/50A (customised) |
| Capacity | 3 / 5 / 10 / 15 / 20kVA (customised) |
| HV output | 0–50 / 100 / 150 / 200kV (customised) |
| HV current | 50mA to 2000mA (customised) |
| Voltage / current accuracy | ≤1.5% ±1 digit F.S. |
| Timer | 0–9999s |
| Transformer insulation | Oil, dry or SF6 gas |
| Control unit styles | Case, bench or cabinet |
| Operating temperature | -20 to 50°C |
| Example control units (ZD-A) | Capacity | Input | Output |
|---|---|---|---|
| ZD-A-2/220 | 2kVA | 220V, 10A | 0–250V, 8A |
| ZD-A-5/220 | 5kVA | 220V, 25A | 0–250V, 20A |
| ZD-A-10/220 | 10kVA | 220V, 50A | 0–250V, 40A |
| ZD-A-20/400 | 20kVA | 380V, 50A | 0–430V, 46.5A |
Features
- AC and DC withstand testing from one system
- Oil, dry or gas-insulated HV transformers
- Case, bench or cabinet control units
- Built to order from 2kVA to 20kVA and up to 200kV
- Timed tests up to 9999s with voltage and current measurement
Applications
Withstand testing of transformers, switchgear, cables, capacitors and vacuum interrupters; testing of insulating tools, gloves, blankets, ropes, hot sticks and aerial platforms; factory and workshop dielectric testing.