GDYT Partial Discharge Testing System 5kVA/50kV
It is mainly used for testing frequency voltage insulation level of various insulation materials, insulation structure and electrical products, also as partial discharge frequency testing power supply for testing object such as transformer, mutual inductor and lightning arresters. It widely used in electrical manufacturing, power operation departments, research institutes and universities.
I. GDYT System 5kVA/50kV composition
- Hipot Test Control Table GDYD-5/50
- PD-free Gas type transformer YDQW-5/50
- Coupling capacitor TAWF-50kV
- Protective resistor GR50kV
- Isolation filter LBQ-5kVA
- Partial discharge detector
- Other accessories
Hipot control Unit (GDYD-5/50) and PD-free testing transformer are controlling and voltage boosting for test object which boosted to the rated voltage.
Partial discharge detector is detecting and displaying partial discharge capacity.
Isolation filter(LBQ-5kVA) is device of anti-interference caused by power supply.
Coupling Capacitor is transmitting partial discharge signal to partial discharge detector.
II. System principle diagram
K1: Circuit breaker
TY: Voltage regulator
GK: Compensation reactor
LBQ: Anti-interference filter
TPU: Fast Over-voltage protection device(Optional)
B1: Testing transformer
R: Protective resistor
KZ: Control table
C1&C2: Capacitive divider with Coupling capacitor
III. System Specifications
- Power supply:220V±10%,50Hz
- Rated Capacity: 5kVA
- Output Voltage: 50kV, current: 100mA
- Input Voltage: 200V, current: 25A
- Short-circuit impedance: <18%
- Operation time: 30mins@100% rated voltage and current.
Continuous working@ 2/3 rated voltage and current.
- Wave form distortion rate:<3% when voltage regulator input voltage distortion rate <3%.
- PD value:≤5pC @ 100% rated voltage
IV. Specifications for each parts
- Control Unit
Features
- Digital display meters mounted on the panel.
- Monitoring HV side voltage, HV side current, LV side current and indicator of zero, power, working start, timing.
- Over-current protection, zero-starting protection,sound and light alarm.
- With new type time relay, time rang is more wider (1S ~ 99H).
- Using the latest current relay, more accurate and reliable.
- Light weight, small size, easy to move.
Specifications
- Power: AC220V±10%,50Hz
- Capacity: 5kVA
- Output voltage: AC 0-200V
- Rated output current: 25A
- Rated current rectified range:0-25A
- HV voltmeter range: 0-60kV
Accuracy: 1.5% of the reading±2digit(F.S)
- HV ammeter range: 0-80mA
Accuracy: 1.5% of the reading±2digit(F.S)
- LV ammeter range: 0-25A
Accuracy: 2.0% of the reading±2digit(F.S)
- Timing range:1s-99h
- Weight: 18kg
- Dimension: 440mm (L)*340mm (W)*240mm (H)
2. PD-free Gas testing transformer (HV unit) specifications
- Rated capacity: 5kVA
- Input voltage: 0-200V
- Input current: AC 0-25A
- Output voltage: AC 0-50kV
- Output current: AC 100mA
- Voltage accuracy: AC 1.5%
- PC value on rated voltage: ≤5pc
- Voltage distortion factor: <3%
- Insulation dielectric: SF6 gas
- Weight: about 50kg.
- Coupling capacitor TAWF-50
- Rated frequency: 50Hz
- Standard capacitance: 800pF±10%
- Rated voltage: 50kV
- Voltage ratio: 1000/1
- Dielectric loss: <0.5%
- Measurement accuracy: 1%
- Permitted operation time: same with testing transformer
- PD value: ≤8pc on 100% of rated voltage, ≤5pc on 80% of rated voltage.
- Protective resistor GR50kV
- Rated frequency: 50Hz
- Rated voltage: 50kV
- Resistance: 5kohm
- Rated current: 0.5A
- Permitted operation time: same with testing transformer
- Isolation filter LBQ-5kVA
- With L-C filter loop circuit, and built-in filter compensation device
- Rated capacity: 5kVA
- Rated voltage: 200V
- Rated current: 25A
- No-load consumption: ≤5%
- Impedance voltage: ≤5%
- Attenuation: 40kHz-100kHz ≥40dB
100kHz-1.5Mhz ≥60dB
- Permitted operation time: same with testing transformer
- PD Detector
GDJF-2008 Partial Discharge Detector is measuring partial discharge for the products such as 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 well equipped 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 capacitance |
Unit |
Sensitivity(pC)
(Unsymmetrical circuit) |
| 1 |
6-25-100 |
pF |
0.02 |
| 2 |
25-100-400 |
pF |
0.04 |
| 3 |
100-400-1500 |
pF |
0.06 |
| 4 |
400-1500-6000 |
pF |
0.1 |
| 5 |
1500-6000-25000 |
pF |
0.2 |
| 6 |
0.006-0.025-0.1 |
mF |
0.3 |
| 7 |
0.025-0.1-0.4 |
mF |
0.5 |
| 8 |
0.1-0.4-1.5 |
mF |
1 |
| 9 |
0.4-1.5-6.0 |
mF |
1.5 |
| 10 |
1.5-6.0-25 |
mF |
2.5 |
| 11 |
6.0-25-60 |
mF |
5 |
| 12 |
25-60-250 |
mF |
10 |
| 7R |
Resistance |
|
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)
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