​​​​​​​Partial Discharge Detector-扬州达瑞

Partial Discharge Detector

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Main Technical Specifications 

1. Capacitance range of test object: 6pF~250μF. 

2. Detection sensitivity and allowable current 

Input Unit No.	Tuning Capacitance Range	Sensitivity (pC) (Unbalanced Circuit)	Allowable Current (RMS)
			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	Resistor	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°, can rotate 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 6 steps, gain difference between steps 20±1dB, 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 analog meter 0—100 error ±5% (of full scale).

(2) Logarithmic scale analog meter 0—10—100 error ±5% (of full scale).

(3) Digital meter: 3.5-digit LED display 0—100 error: ±3% (of full scale).

8. Test voltmeter

(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

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 divided into 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 specifically for partial discharge testing of cross-linked cables based on the characteristics of the cable industry. 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 released by Yangzhou Darui Electric Co., Ltd.