Dielectric Loss Tester
Darui Electric recommends：
Auto anti-interference D/L tester is a novel intelligent instrument for measuring tgδ and Cx.Field measurement of tgδ and Cx for insulating materials, bushings, cables, capacitors, CT/PT, transformers. Integrated with std cap and boost supply, compact, portable. Simple, auto, accurate, strong anti-interference. Compatible with external HV std caps for HV D/L measurement.
Main Features
1. Simple wiring (2 wires for normal, 1 for reverse), all cables shielded, ground-drag usable. Auto ramp, direct reading, no conversion.
2. Multiple modes: normal/reverse wiring, int/ext std cap, int/ext test voltage.
HV D/L measurement capable
3. Anti-vibration: withstands strong vibration during transport.
4. Strong anti-interference: auto tracking compensation circuit, vector+phase shift, eliminates E-field interference for 500kV substations.
5. CVT: unique self-excitation, no external equipment. One wiring (3 cables, ~1min), two results (C1, C2 D/L and capacitance). Real-time Chinese display of self-excitation current and test voltage. Accurate and reliable.
6. Safety Measures
(1) HV protection: rapid HV cut-off on short, breakdown or current fluctuation.
(2) CVT protection: auto exit on overcurrent setpoint, no damage.
(3) Ground detection: cannot boost without proper grounding.
(4) Anti-misoperation: detects common wiring errors, safety alarm.
(5) Anti-capacitive rise: auto tracks output voltage, maintains constant test voltage for large-capacity test objects.
7. VFD display: large dot-matrix, clear in all seasons. Chinese menu, intuitive, no manual needed.
8. Built-in micro printer for Chinese measurement results and status.
9. RS232 Interface: The instrument has an RS232 interface for connecting to a computer for data statistics, processing and storage.
Technical Specifications
1. Rated Operating Conditions:
Ambient Temp: -10C~50C
RH: 30%-85%
Power: mains or generator, 220V±22V, 50±5Hz
2. Dimensions: 420×305×430mm
3. Weight: 25kg
4. Measurement Range:
D/L (tgδ) range: 0-100%, resolution 0.01%
Cx Measurement Range:
5. Internal: 3pF~40000pF at 10kV
At 0.5kV: 60pF~0.8μF
6. External Method
1) External Booster Mode (external HV, internal std cap)
Max test voltage: 10kV
2) External Cn Mode (external HV, external std cap)
Max voltage by std cap and test object (Umax=Imax/ωCn)
Max std loop current: 1A (In=UωCn)
Max test loop current: 1A (Ix=UωCx)
7. Basic Measurement Error
At 20C±5C, RH 30%-85%, per Table 1. Error change ≤1/2 base limit per 10C.
Table 1
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Measurement Parameters
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Wiring Method
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Basic Error
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D/L tgδ
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Normal
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±(1% reading+0.0005)
|
|
Reverse
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±(1% reading+0.0010)
|
|
Capacitance Cx
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Normal
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±(1% reading+1pF)
|
|
Reverse
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±(1% reading+2pF)
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8. Internal Booster Output Capacity
Output: 0.5-10kV (20 steps)
Max output: 140mA at 10kV
