Product introduction
The Dielectric Loss Factor Tester is a specialized instrument used in power systems to precisely measure the dielectric dissipation factor (tanδ) and capacitance (Cx) of insulating materials in high-voltage electrical equipment. It represents an upgraded version of traditional power-frequency (50Hz/60Hz) dielectric loss testers, with its core feature being the use of test frequencies different from the grid power frequency to overcome on-site.
The Dielectric Loss Factor Tester is indispensable for modern power system insulation diagnostics. By using non-power-frequency testing, it overcomes on-site interference, ensuring accurate and reliable measurements of tanδ and Cx. Its anti-interference capability, precision, safety, portability, and intelligence make it vital for grid safety, fault detection, and condition-based maintenance.
Product Parameters
| High voltage output | 0.5~10kV |
| Increasing by 500V for each level, a total of 20 levels, capacity: 1500VA | |
| Accuracy | tgδ: ± (reading * 1.5% + 0.06%) |
| Cx: ± (reading * 1.5% + 5PF) | |
| Resolution | tgδ: 0.001% |
| Cx: 0.001pF | |
| Measuring range | 0.001% <tgδ <100% |
| Internal high pressure | 3PF~<60000PF/10KV |
| 60PF~1uF/0.5KV | |
| External high pressure | 3PF~1.5uF/10KV |
| 60PF~30uF/0.5KV | |
| Power supply | AC 220V ± 10% 50/60 ± 1Hz |
| Measuring method | a.single frequency: 45(45Hz measuring),50(50Hz measuring),55(55Hz measuring),60(60Hz measuring),65(65Hz measuring) |
| b.different frequency: 50D(45Hz/55Hz measure each time) 60D(55Hz/65Hz measure each time) Automatic frequency conversion | |
| Harmonic adaptation | ≤3% |
| Application condition | -15℃－50℃ Relative humidity<80% |
| Dimension | 460 (L) × 345 (W) × 345 (H) |
| Weight | 35kg |
Core Safety Precautions
1. De-energization & Full Discharge:
The tested equipment must be completely powered off and have a clear disconnection point with other live equipment.
Before, after, and when replacing the test line, the tested equipment (including its windings, terminals, bushings, etc.) and the high-voltage output terminal of the testing instrument must be fully and reliably grounded and discharged. The discharge time should be long enough (usually recommended for a few minutes) and operated with a discharge rod. This is the most critical step in preventing electric shock injuries
During the testing process, it is strictly prohibited to touch the high-voltage parts of the tested equipment, high-voltage test lines, and the HV output terminals of the instrument.
2. Reliable Grounding:
The tester's ground terminal MUST be securely connected to a good earth ground (e.g., grounding rod or grid) using a dedicated ground wire (sufficient cross-section, typically ≥4mm²). Poor grounding is a common cause of danger and measurement errors.
The EUT (especially its metal enclosure, base, or designated ground terminal) should also be reliably grounded.
Ensure the entire test loop (tester, test leads, EUT) has good grounding connections.
3. HV Danger Zone:
Clearly mark the test area with safety barriers or warning signs (e.g., "HIGH VOLTAGE - DANGER - KEEP OUT") to prevent unauthorized access.
Operators must be aware of the HV zone and maintain a safe distance from HV parts.
4. Inspect Test Leads & Connections:
Thoroughly inspect all HV test leads, LV test leads (signal lines, ground wires) for damage, cracks, aging, or loose connectors BEFORE USE. NEVER use leads with damaged insulation.
Ensure all leads are connected securely and correctly. Keep unshielded HV leads at a safe distance from ground, grounded objects, LV leads, and each other to avoid discharge. Avoid coiling HV leads.
5. Check Tester Status:
Visually inspect the tester for damage before use; check display and keys for normal function.
Perform self-test (if available) upon power-up to confirm normal operation.
Ensure battery is sufficiently charged (for portable units) or external power is stable.
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