China Pd-Free Partial Discharge Detector

General Information
GDJF-2008 Partial Discharge Detector is measuring partial discharge for the products suchas transformers, mutual inductors, HV switches, zinc monoxide arresters and power cables. It also can make type tests and monitor insulation operation.
This type has the advantages of high sensitivity, wide range of capacitance, being wellequipped for input unit impedance detecting and more variants of frequency bands ( 9 in all). After proper setting, the discharge impulse amount can be read directly. The indicating and digital meters are shown simultaneously.
This detector is widely applied in power stations, manufacturers and institutions.
Use Condition

Ambient temperature: 0-40ºC±2ºC.
Relative humidity: ≤80%
Power supply: 220V±10%,50HZ.
No violent vibration and mechanical shock
The device should be placed in the environment with no dust and corrosive, good ventilation. It should not be interfered by strong electromagnetic
Earthing requirements: earthing resistance <1Ω
Capacitance range to be tested 6PF-250μF

Testing sensitivity (shown in Table.1)

Input unit
No.Tuning capacitanceUnitSensitivity(pC)
(Unsymmetrical circuit)16-25-100pF0.02225-100-400pF0.043100-400-1500pF0.064400-1500-6000pF0.151500-6000-25000pF0.260.006-0.025-0.1mF0.370.025-0.1-0.4mF0.580.1-0.4-1.5mF190.4-1.5-6.0mF1.5101.5-6.0-25mF2.5116.0-25-60mF51225-60-250mF107RResistance 0.5

Table 1
Amplifier band
Low terminal: 10KHZ, 20 KHZ, 40 KHZ (optional)
High terminal: 80 KHZ, 200 KHZ, 300 KHZ (optional)

Amplifier gain adjustment
Coarse control - there are 6 gears for coarse tuning, the gain of each gear is 20±1db
Fine control ≥ 20 db

Time windows
Width of window, adjustable 15o-150o
Window position, adjustable 0o-170o
Two windows can be opened simultaneously or separately.

Discharge meter
Digital display
PD display: LED 3½ digits
0-100.0 limit of error <±3% (full scale)

Ellipse time base
Frequency: 50Hz and arbitrary frequency
Elliptic display color is yellow
Elliptic rotation: each gear is 30°, 180 ° rotation can be made.
Display: ellipse - straight line
High frequency time base elliptical input voltage less than 220 V, intake power < 1 VA

Waveform lock
Lock required waveform of any time to facilitate observation and analysis

Testing Voltage meter
Range: 100KV (Can be expanded)
Display 31/2 digital voltage meter
Accuracy: better than ±2% (full scale)

Inside, outside the zero mark function
Dimensions: 450x450x190 mm
Weight: about 16kg