China Insulation Diagnostic System

Performance
The instrument use vector current method to measure capacitance, dielectric loss and other parameters. Test results of high precision, automatic measurement.
The instrument clears up interference of 50Hz power frequency, reliable data can be measured even in the context of strong electromagnetic interference.
The apparatus has a large screen DOT-matrix liquid crystal displays, easy to operate through menu.
The instrument is controlled by microprocessor as long as the appropriate choice of measurement, the measurement data can be done automatically under the control of the microprocessor.
The integration of models, standard capacitors and high voltage power supply included for easy field testing & wiring.
The instrument has good measurement accuracy, to meet the requirements of measurement of dielectric loss, so simply with standard oil cup, and special test line can be realized oil dielectric loss measurements.
CVT testing capabilities enable self-excitation method CVT test, no external attachments.
Real anti-grounding wiring test sample measurement, a small capacitor ground test articles, good test accuracy.
Overcurrent protection: Short circuit or breakdown of DUT will not damage the instrument.
10. Ground fault protection function: When the instrument is ungrounded or bad ground, the instrument does not enter the normal procedure and stop output high.
Technical parameters
1. Input: 180V ~ 270V AC, 1-phase, 50/60Hz ± 1%;
2Test voltage: 0.5 ~ 10 kV, user-selectable
3. Test current: 200 mA maximum
4. Accuracy:
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:
- Fixed Frequency measurement:
45, 50, 55, 60, 65Hz; User-selectable or
-Dual frequency measurement with automatic
Averaging: 45/55Hz, 55/65Hz, 47.5/52.5Hz; User- selectable
Measurement modes
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.
Measurure range
Test capacitance range @ 50 Hz / 60Hz.
-Internal power supply 200 mA max.
3pF ~ 60000p F @ 10kV
60pF ~ 1µ F @ 0.5kV
-External power supply, 5A max.
3pF ~1.5µ F@10kV
-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
Thermal 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.

Sr no Technical parameter
1AccuracyCx± (readingx1%+1pF)
PF± (readingx1%+0.00040) 2Interference RatioInterference current is no more than 2 times of the test current 3Capacitance Range:Internal HV: 3pF~60000pF / 10kV,
60pF~1uF/0.5kV
External HV: 3pF~0.3uF/10kV
Resolution 0.0001pF, 4 digital 4tgδ RangeNo limit, Resolution 0.001%, C/L/R automatic recognition 5Input current range10μA~1A 6Internal HV0.5~10kV / 200mA (max) 7HV AdjustingRise or fall smoothly 8HV Accuracy± (readingx1%+10V), Resolving 1V 9Frequency select50 or 60Hz single frequencyt locked
55Hz/65Hz double point, locked
10Test Time40S typical 11Power Supply180V~270V 50Hz/60Hz auto 12Operating Temperature0C~60C 13Humidity<90%