Major equipment
400 kV/200 kVA AC test transformer
-
Test transformer (PHENIX 6CCE400-285): continuous at 200kVA, 400kV, 500mA
- Regulator (PHENIX CTVT): 0-600VAC, 110kVA
- Compensation reactor (PHENIX): 100kVAR step
- AC measurement divider (PHENIX DVD400): 400kV AC, 1nF, PD <2pC at 400kV
The test facility is connected to the PLC controlled digital recording system (PHENIX). Accuracy is (0.8% of reading + 0.2% of range to LSD)
Types of test:
- AC withstand test- D149 ASTM standard
- AC flashover test - (dry or wet)
- PD tests with background noise level below pC @ 300KV
AC Dielectric tests of the types indicated above can be carried out on:
- Bushings
- Insulators
- Insulating tapes and sheets
600 kV/30 kJ impulse generator
-
Impulse generator (Haefely SGSA 600-30): 600kV, 30kJ
- Damped capacitor divider (Haefely LGR 600-500): 500pF, 600:1.4
- Charging rectifier (Haefely LGR 100-20): 100kV DC, 20mA, thyristor controlled
The test facility is connected to the High-resolution digital recording system (Sigma 100): color display, 25MHz Bandwidth. Also this generator can be adjusted to produce a steep front fast impulse with < 200 ns rise time.
Types of test:
- Lightning impulse withstand test (full and chopped wave)
- Lightning impulse flashover test (standard and steep front)
- Switching impulse wet and dry withstand test
- Switching impulse wet and dry flashover test
- Special non-standard impulse flashover test and withstand test
- Steep front (<200 nS) impulse test
Impulse tests of the types indicated above can be carried out on:
- Motors and generators coils, up to and including 13.8 KV
- Ultra fast capacitors
- Bushings
- Switchgear, disconnecting switches and circuit breakers
- Power cables and accessories
- Distribution and power transformers
- Instrument transformers
- SF6 insulated equipment
300 kV/10 mA DC test unit
- 300 kV DC Power Supply Specifications (Glassman PK300R10)
- AC/DC Kilovoltmeter Divider (Hipotronics KVM300)
A 4 kW air insulated high voltage DC power supply which offers low
| Power supply voltage | Specifications |
|---|---|
| Input voltage | 187-228 V rms-3 phase, 48-63 Hz, fused for 20 A |
| Output voltage | 0 to +/- 300 kV |
| Output current | 0 to 10 mA |
| Power | 4 kW |
| Divider | Specifications | |
|---|---|---|
| Voltage rating | rms | 300 kV AC |
| dc | 300 kV DC | |
| peak | 425 kVp | |
| Input impedence | 1 MΩ | |
| Nominal ratio (VOUT/VIN) | 3000:1, assumption a load impedance of 1 MΩ and <500 pF | |
| HV arm impedance | Parallel R and C branches | |
| Resistance | 900 MΩ | |
| Capacitance | 200 pF | |
| Frequency response | DC to 1 kHz | |
| Accuracy | dc | <0.5% |
| rms, average | <1.0% | |
| peak | <2.0% | |
Capacitance and Tan-delta bridge
-
Megger CDAX 605 High Precision capacitance
and dissipation factor measurement instrument, 2 channels, 5-400Hz, 0-100microF +/-0.1%, 0-5A.
- Haefely PZT 100-0.1 AC Transformer, 100 kV/10 kVA, PD level < 2 pC
- HV TECHNOLOGIES 300 kV MCP 300 standard capacitor, 100/16 pF ± 5%, Tan delta <1e-5
Features
- True sine wave measurements over 5 to 400 Hz
Tan-delta measurements can be carried out on:
- Distribution transformers
- Capacitors
- Bushings
- Distribution cables
- Distribution cable terminations and splices
- Distribution surge arresters
- Motor and generator stator coils
- Insulators
Partial discharge (noise level < 1 pC at 150 kV, <3 pC at 300 kV)
AC test set (Hipotronics, 7150-20AM-AX-G): 150 kV/ 20 kVA, PD level < 2 pC
The ACDielectric Test Set provides a complete range of discharge
free test power for a variety of capacitive, inductive or resistive loads. Regarding very low PD level, it also can be used as a power source for partial discharge setup. The test system comprises, test transformer, regulator, calibration capacitor, control unit, and coupling capacitor as the main components.
PLC conventional HV PSU controller (Hipotronics, CAC-PLC)
The CAC-PLC is designed for control, regulation and protection of the PD test setup.
PD Detector (Hipotronics, DDX 9101)
The DDX 9101 is one of the new generations of digital wide-band partial discharge detectors with basic functions of an analog detector and meets all IEC and IEEE/ANSI standards for partial discharge testing. The DDX 9101 simply measures the level of PD and the applied test voltage.
Partial discharge is one of the most important tests for the condition assessment of the insulation in high voltage equipment. A low background noise level is necessary for the proper determination of the inception voltage and partial discharge level. The laboratory provides a background of less than 3 pC and tests specified in IEC and IEEE/ANSI standards are easily met.
PD tests of the types indicated above can be carried out on:
- HV capacitors
- Bushings
- HV cables
- Distribution transformers
- Insulators
Salt fog and clean fog chamber
Salt-fog and clean-fog tests are the basic tests that are done on outdoor insulation materials and on insulators. The stainless steel test chamber is capable of testing up insulations up to 25 kV with leakage current monitoring for analysis of the harmonic components of the leakage current.
Salt-fog and clean-fog tests can be done on:
- Material formulations
- Distribution insulators
- Cable terminations
- Surge arresters up to 35 kV voltage class
Inclined plane (IPT), laser and dry arc tests
This test can be done according to ASTM D2303 or IEC 60587.
DC IPT test can also be performed on insulating materials to evaluate the initial tracking voltage and time to track on both "+" and "-" polarities.
An infrared laser simulates the heat erosion during dry band arcing in the incline plane test.
The method provides the same ranking of materials in a less time and has smaller standard deviation in the results.
This test can be done in accordance to ASTM D495 and IEC 61621.
Additionally, current during the test can be recorded.