Product

Automatic dissipation factor and capacitance tester

Transformer Capacitance and Tan-Delta Tester is a advanced, fully automatic device for on-site measurement of dielectric loss/dissipation factor(tgδ) and capacitance (Cx) in electrical equipment. It is ideal for use with transformers, insulating bushes, CT/PTs, Capacitors, MOAs, and similar devices.

Product Description

KV-7500 Automatic dissipation factor and capacitance tester

Overviews

Transformer Capacitance and Tan-Delta Tester is a advanced, fully automatic device for on-site measurement of dielectric loss/dissipation factor(tgδ) and capacitance (Cx) in electrical equipment. It is ideal for use with transformers, insulating bushes, CT/PTs, Capacitors, MOAs, and similar devices.

 

Feature

  • Adopts Fourier transform digital filtering technology for precise capacitance and dielectric loss measurements, enabling automatic and accurate results.
  • Frequency conversion technology in the instrument eliminates 50Hz power frequency interference, ensuring reliable data in areas of strong electromagnetic interference.
  • The full touch LCD is user-friendly, with a comprehensive graphical interface that makes the operation clear and simple, allowing operators to measure processes via touch without specialized training.
  • Data storage is facilitated by a calendar chip and ample memory, allowing for immediate result saving, historical record viewing, and printout with current and logged times
  • The instrument’s operation and easurement process is microprocessor-controlled, automating data measurement once the correct mode is selected.
  • The integrated design includes a standard capacitor and high-voltage power supply, making field testing convenient and reducing on-site wiring.
  • The instrument’s high accuracy fulfills the requirements for measuring oil dielectric loss, necessitating only a standard oil cup and tesing line.
  • It features low-voltage shielding for reverse wiring, allowing for dielectric loss measurement of 110 kV reverse wiring under 220 kV CVT bus grounding without disconnection.
  • It can conduct AC voltage withstand tests, useful for PT and CT secondary voltage endurance tests and 400V low voltage systems.
  • The instrument recognizes external high-voltage power supply frequencies from 40Hz to 70Hz, accommodating large capacity and high voltage dielectric loss tests with power frequency or series resonant power supplies.
  • It has a CVT test function, enabling self-excitation tests with four high/low voltage/current protection settings for safety.
  • When testing CVTs, it automatically measures the capacitance and dielectric loss of C1 and C2, as well as the total values for the equipment.
  • It includes a thermal printer for immediate report generation, with a built-in calendar and USB output for convenience.
  • Grounding protection prevents high voltage output when grounding is insufficient or absent, and overcurrent protection safeguards the instrument against sample short-circuits or breakdowns.
  • An electric shock protection feature immediately cuts off high voltage in case of operator contact, ensuring tester safety.

 

Technical Specifications:

 

Accuracy: Cx: ±(read ×1%+1pF)
tgδ: ±(read ×1%+0.00040)
Anti interference: Frequency conversion anti interference, under 200% interference, still can reach above accuracy.
Capacitance range: Internal HV: 3pF~50000pF/12kV 60pF~1μF/0.5kV
External HV: 3pF~1.5μF/12kV 60pF~30μF/0.5kV
Resolution: Max. 0.001pF,4 significant figures
Tgδ range: unlimited,resolution: 0.001%,capacitance, inductance, resistance can be identified automatically.
Test current range: 10μA~5A
Inner HV: Setting voltage range: 0.5~12kV
Max. output current: 200mA
Increase/decrease voltage: Continuous slide regulating
Voltage precision: 2%
Voltage resolution: 1V
Test frequency: 45, 50, 55, 60, 65Hz single frequency
45/55Hz, 55/65Hz, 47.5/52.5Hz auto double frequency conversion
Frequency precision: ±0.01Hz
Outside HV: UST Positive connection max. test current 5A,Power frequency or frequency conversion 40-70Hz
GST Negative connection max. test current: 12kV/5A,power frequency or frequency conversion 40-70Hz
CVT self excitation LV output: Output voltage 3~50V,output current 3~30A
Measuring duty: about 36s, it depend on measuring methods
Input power supply: 180V~270VAC,50Hz/60Hz±1%,local supply or by generator.
RS232
Build-in thermal printer
Environmental Temperature: -10℃~50℃
Relative humidity: <90%
Oversize & weight: 460×360×350mm 28kg
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