Partial Discharge Detector
Darui Electric recommends
Main Technical Specifications
1. Capacitance range of test object: 6pF~250μF.
2. Detection sensitivity and allowable current
|
Input Unit
Number
|
Tuning Capacitance Range
|
Sensitivity (pC)
(Unbalanced Circuit)
|
Allowable RMS Current
|
|
Unbalanced Circuit
|
Balanced Circuit
|
|
1
|
0 ～ 25 ～ 100pF
|
0.02
|
30mA
|
0.25A
|
|
2
|
25 ～ 100 ～ 400pF
|
0.04
|
50mA
|
0.5A
|
|
3
|
100 ～ 400 ～ 1500pF
|
0.06
|
120mA
|
1A
|
|
4
|
400 ～ 1500 ～ 6000pF
|
0.1
|
0.25A
|
2A
|
|
5
|
1500 ～ 6000 ～ 25000pF
|
0.2
|
0.5A
|
4A
|
|
6
|
0.006 ～ 0.025 ～ 0.1μF
|
0.3
|
1A
|
8A
|
|
7
|
0.025 ～ 0.1 ～ 0.4μF
|
0.5
|
2A
|
15A
|
|
8
|
0.1 ～ 0.4 ～ 1.5μF
|
1
|
4A
|
30A
|
|
9
|
0.4 ～ 1.5 ～ 6.0μF
|
1.5
|
8A
|
60A
|
|
10
|
1.5 ～ 6.0 ～ 25μF
|
2.5
|
15A
|
120A
|
|
11
|
6.0 ～ 25 ～ 60μF
|
5
|
25A
|
200A
|
|
12
|
25 ～ 60 ～ 250μF
|
10
|
50A
|
300A
|
|
7R
|
Resistance
|
0.5
|
2A
|
15A
|
Table 1: Detection sensitivity and allowable current values for input units
3. Elliptical scanning time base
(1) Frequency: 50Hz;
(2) Rotation: in steps of 30°, rotatable up to 120°;
(3) Display mode: ellipse - straight line.
4. Display unit
Uses a 98×84 (mm) rectangular oscilloscope tube with brightness and focus adjustment knobs.
5. Amplifier
(1) 3dB low-frequency cutoff: selectable 10, 20, 40kHz;
(2) 3dB high-frequency cutoff: selectable 80, 200, 300kHz;
(3) Gain adjustment: coarse adjustment in 6 steps, with 20±1dB difference between steps, fine adjustment range > 20dB;
(4) Asymmetry of positive and negative pulse response < 1dB.
6. Time window
(1) Window width: adjustable, 15°～150° at 50Hz;
(2) Window position: each window can be rotated 0°～170°;
(3) Two time windows can be opened separately or simultaneously.
7. Pulse peak meter
(1) Linear scale pointer meter: 0—100, error ±5% (based on full scale).
(2) Logarithmic scale pointer meter: 0—10—100, error ±5% (based on full scale).
(3) Digital meter: 3.5-digit LED display, 0—100, error: ±3% (based on full scale).
8. Test voltage meter
(1) Uses a 3.5-digit digital meter, can read test voltage or pC value;
(2) This system uses a capacitive voltage divider, 0~100kV direct reading;
(3) Error: ±3%.
9. Zero marking system
The internal peak marker generator produces peak markers (the PD detector must be connected to a 1000:1 capacitive voltage divider to generate them).
10. Calibration pulse generator (built-in)
(1) Calibration square wave voltage amplitude: 10mV~4V in 11 steps;
(2) Calibration square wave pulse rise time: ≤60nS;
(3) Calibration square wave pulse fall time: ≥100uS;
(4) Discharge calibration range (when high-voltage injection capacitance is 100pF): 1, 2, 4, 5, 10, 20, 40, 50, 100, 200, and 400pC;
(5) Repetition frequency: same as time base frequency, 50Hz;
(6) Pulse rotation: 0~360°, divided into two ranges.
This product is designed and developed by our factory based on the characteristics of the cable industry, specifically for partial discharge testing of cross-linked cables. It has a built-in calibration pulse generator, higher integration, small size, and simple operation.
Note: The above information and technical parameters are compiled and published by Yangzhou Darui Electric Co., Ltd.
