Insulating dielectric loss measurementof transformers, transformers, reactors, capacitors, and bushings, surge arresters is a very basic test method can effectively find the overall damp insulation deterioration and local defects of electrical equipment. It is widely used in electrical manufacturing, electrical equipment installation, transfer and preventive tests.
WGSL-4C Automatic Frequency Dielectric Loss Tester bridge broke through the traditional measurement, adopting variable frequency power supply technology, SBC and modern electronic technology of automaticly frequency conversion, A / D conversion and data operations; It has the characters of good anti-interference ability, fast test speed, high precision, fully automatic digital and easy to operate; It has a high-power switching power supply to output 45Hz and 55Hz pure sine wave, providing up to 10 kV voltage; It can automatically filter out 50Hz interference suitable for testing at substations and other fields of large electromagnetic interference.
1. Input: 180V ~ 270V AC, 1-phase, 50/60Hz ± 1%;
2. Test voltage: 0.5 ~ 10 kV, user-selectable
3. Test current: 200 mA maximum
Capacitance: +1% of reading + 1pF
Tan: +1% of reading +. 00040
Voltage: +1% of reading.
5. Interfernce Supression:
Ratio of interference current to specimen current: 2: 1
Line frequency modulation technique either by:
1) Fixed Frequency measurement:
45, 50, 55, 60, 65Hz; User-selectable or
2) Dual frequency measurement with automatic
Averaging: 45/55Hz, 55/65Hz, 47.5/52.5Hz; User- selectable
UST (Ungrounded specimen test)
This test is made when the specimen can be insulated from ground.
The test is often used to reduce the effect of stray capacitance Losses to ground and to reduce the effect of interference pickup from nearby Energized apparatus.
Typical test specimen include the primary to secondary winding insulation in high Voltage transformers and measurements on HV bushings with a capacitance tap.
GST (Grounded specimen test)
This is the most frequent used test connection and involves all insulation between The high voltage conductor and ground. Typical test specimens include transformer Windings to tank and core, circuit breaker assemblies, coils of rotating machines, etc.
GST-g (Grounded specimen test with guard )
This test is used to separate the total values of the GST into separate
Parts for better analysis. Often this test is used with the GST to confirm the test
Readings made using the UST
7. Test Duration
Typically 40 Seconds, fully automatic testing.
The unit automatically ramps up to set test voltage, take measurement, ramps down Voltage to zero and prints out test result.
Test capacitance range @ 50 Hz / 60Hz.
1) Internal power supply 200 mA max.
3pF ~ 60000p F @ 10kV
60pF ~ 1µ F @ 0.5kV
2) External power supply, 5A max.
3pF ~1.5µ F@10kV
3) Resolution: 0.001pF, 4 digits
Tgδ Range: Unlimited, resolution. 0001% Voltage: 0~10kV, it can automatically identify capacitance/Inductance/Resistance.
Current: 10µ A~5A
9. Built-in Printer
10. Operator Safety And Protection
The tester is equipped with self-diagnostic procedures, protection Against short circuits, open and poor ground connection, Input over-voltage and audible sound, flashing light indicators during test.
1) Operating temperature: -10 to 600C
2) Storage temperature: -200C to 600C
3) Relative humidity: <90% non-condensing
12. Accessories Supplied
1) HV cable with hook and clip
2) 2 sets of Cx and Cn cables with clips
3) Guard cable with clips
4) Paper roll, fuses in a cable bag
13. Dimension: 460mm L X 350mm W X 340mm H
Weight: Unit: 28 kg; Cable: 3.5 kg