Which dielectric loss tester is good _ anti-interference dielectric loss tester
**MS-101D Anti-Interference Dielectric Loss Tester**
**I. Overview**
The dielectric loss test is a crucial method for evaluating the insulation condition of electrical equipment, helping to identify overall moisture degradation, insulation deterioration, and localized defects. It is widely used in manufacturing, installation, commissioning, and preventive maintenance of electrical systems. The MS-101D anti-interference dielectric loss tester utilizes variable frequency power supply technology combined with microcontroller-based automation to perform frequency conversion, analog-to-digital conversion, and data analysis. This results in high accuracy, fast testing speed, strong anti-interference capability, and user-friendly operation. The device features a high-power switching power supply that outputs 45Hz and 55Hz pure sine waves, capable of providing up to 10kV voltage while automatically filtering out 50Hz interference, making it ideal for field tests in environments with significant electromagnetic noise, such as substations.
**II. Performance Characteristics**
1. Self-excited testing with CVT allows one-time wiring and simultaneous measurement of C1, C2 capacitance and tgδ.
2. Supports external voltage application and measurement of external CN.
3. High measurement accuracy meets oil dielectric loss requirements, requiring only a standard oil cup and special test cables for oil testing.
4. Frequency conversion technology effectively eliminates 50Hz power interference, ensuring reliable measurements even in high EMF environments.
5. Includes grounding protection: if the instrument is not grounded or the connection is poor, it will not start or output high voltage.
6. Over-current protection ensures the instrument remains undamaged during short circuits or breakdowns.
7. Integrated standard capacitor and high-voltage power supply simplify on-site testing and reduce wiring complexity.
8. Equipped with a large LCD screen and Chinese menu prompts, making the testing process intuitive and easy to operate.
**III. Technical Specifications**
1. Measurement range: Capacitance from 4pF to 60,000pF; dielectric loss from 0% to 100%.
2. Maximum error: Capacitance ±(1.0% reading + 1pF); dielectric loss ±(1.0% reading + 0.04%).
3. Resolution: Capacitance 0.001pF; dielectric loss 0.001%.
4. High-voltage output: 0.5–10kV at 45Hz/55Hz, current ≤200mA.
5. Low-voltage output: 3–50V, current 3–30A.
6. Power supply: AC 220V ±10%, 50Hz or generator power.
7. Operating environment: Temperature 0–40°C, humidity ≤90% RH (no condensation).
8. Dimensions: 400 × 315 × 350mm.
9. Weight: 20kg.
**IV. Wiring Methods**
Instrument terminal descriptions:
- **HV**: High-voltage end of the measuring lead (high voltage).
- **CX**: Test current input terminal.
- **GND**: Ground terminal must be connected reliably during use.
**1. Positive Connection Method (See Figure 5)**
When the low-voltage end of the tested device is insulated from ground, this method is used. The high-voltage shielded cable connects to the high-voltage end of the device, while the black low-voltage cable connects to the low-voltage end L of the device. The low-voltage shielded wire connects to the shielded end E. Ensure no short-circuit between core and shield wires, as this may prevent sampling.
**2. Measuring Standard Capacitor BR16 (Figures 4 and 5)**
Figure 4 shows the standard positive wiring for BR16. Figure 5 illustrates the reverse wiring, where one end of the capacitor is forcibly grounded.
**3. Measuring Standard Capacitor BR26 or DB-100 (Figures 6 and 7)**
Figure 6 shows the positive wiring for non-grounded tests, while Figure 7 shows the reverse wiring for grounded tests.
**4. Cascade Voltage Transformer**
- **Conventional method (Figure 8):** Connect A and X to HV, short all low-voltage windings and connect to CX.
- **End shielding method (Figure 9):** Apply 10kV voltage, resulting in smaller capacitance due to uneven voltage distribution.
- **End pressurization method (Figure 10):** Limited to 2.5–3kV, with larger capacitance errors.
**5. Capacitive Voltage Transformer (CVT)**
- **Measuring medium voltage transformer tgδ:** Use reverse wiring for C2, with XT suspended. If CB is small, switch to positive wiring.
- **Measuring C1, C2, tgδ1, and tgδ2:** Connect main capacitor C1 to CX, and C2's δ end to HV. Test voltage limited to 3kV.
**6. Bushing Test**
For separate bushings, connect HV to the conductive rod and CX to the measuring screen using positive wiring. For bushings mounted on transformers, short the conductive rods to the high-voltage end and connect CX to each bushing’s screen.
**7. Transformer Body Dielectric Loss Measurement**
Use reverse wiring when the transformer casing is grounded. Follow the provided table for coil connections and grounding.
**8. Circuit Breaker Fracture Capacitance Test**
Connect high-voltage and CX cables to both ends of the fracture capacitor using positive wiring (see Figure 14).
**9. Current Transformer Testing**
For chain or cascade CTs, use positive or reverse wiring depending on the configuration. For capacitive CTs, measure primary winding relative to the final screen using positive wiring.
**10. Notes During Measurement**
- Avoid windy conditions that may cause unstable high-voltage connections.
- The HV socket carries 10kV, so handle with care. Always ensure proper grounding before starting the test.
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