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KEP OLT-100A Oil Dielectric Breakdown Tester


The KEP OLT-100A Oil Tester is an 100kV breakdown tester used for testing dielectric liquids. It works automatically according to selected standards which are preloaded into the instrument.

Testing of transformer oil and analysis of obtained data can provide the operator with necessary information about any existing or possible faults. If you make such tests periodical – it even can even show trends – and you don’t have to pull down the equipment from its running condition which in the end saves you time and money.


  • Compact and lightweight
  • Fully automatic operation
  • Fully compatible with IEC 60156
  • Preloaded testing programs for different standards
  • Built-in printer
  • PC connectivity
  • Internal test data storage
  • Precise direct voltage measurement
  • True sine high-voltage on electrodes
  • Oil temperature measurement
  • 2 Year Warranty

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The KEP OLT-100A Oil Dielectric Breakdown Tester allows accurate and repeatable results of measured breakdown voltage. Fast high-voltage switch off time makes it possible to carry out test of dielectric liquids, which are easily destroyed under such influences.

The internal design of KEP OLT-100A Oil Dielectric Breakdown Tester combined with a use of automatic high voltage breakers, cutting off supplied voltage if tester’s lid has been opened during the test, provide operator with high level of safety.

The KEP OLT-100A Oil Tester comes fully equipped and are ready for operation immediately after unpacking. It comes supplied with a test vessel (IEC 60156 – basic configuration) with VDE 0370 mushroom-shape electrodes. A gap between electrodes is easily regulated with a use of pass-no pass gauge, which comes in pack.

The KEP OLT-100A Oil Dielectric Breakdown Tester provides a fully automatic test procedure according to selected standard (basically IEC 60156 and GOST 6581 settings are preloaded). It has a built-in printer which is able to print a test report after procedure is done. Test results are saved into non-volatile memory of the KEP OLT-100A Oil Tester. A PC-connectivity makes it easy to collect data from the OLT-100A, save and store them as well as print a fulfilled report. Test voltage is being measured directly on electrodes. This fact combined with a true sine voltage shape (independent from supply voltage shape), increases repeatability and accuracy of measurements.

Test vessel for this KEP OLT-100A Oil Tester is supplied with a magnetic stirrer, which stirs a liquid between measurements.

KEP OLT-100A Oil Dielectric Breakdown Tester Specification:

Characteristic Value
Output AC voltage (symmetrical) 100kV rms
Voltage resolution 0.1kV
Measurement uncertainty 3% of reading
Output voltage rise rate 2kV/s ± 0.2 – basic (changes according to selected standard)
Switch-off time on breakdown < 5μs
Temperature measuring range 5.0 – 50.0 °C
Programmed test sequences IEC 60156 (BS EN 60156, CEI EN 60156, NF EN 60156, UNE EN 60156, SABS EN 60156, PA SEV EN 60156) GOST 6581
Electrodes “mushroom” type IEC 60156
Test vessel IEC 60156, 400 ml, 1.0 kg
Go/No-Go gauge width 2.45 / 2.55 mm
Display resolution 128 × 64 dot matrix, monochrome
Interface languages English, Russian, Turkish
Printer thermal line, 8 dots/mm, 384 dots/line
Memory for results, cells 512
PC connectivity USB B-type
Input voltage, V 230 ± 10% (basic),
110/120 – on request
Line frequency 50/ 60Hz ± 1
Power consumption O 140VA
OLT-100 dimensions (W × H × D), 530 × 315 × 320 mm
Net weight 30 kg

Standard Accessories

Component Quantity
OLT oil tester 1
Test vessel* IEC 60156 with electrodes and cover 1
Go/No-Go gauge 1
Magnetic stirrer 1
Lifting stick for magnetic stirrer 1
USB cable (A-B type) 1
Power cord (C-type plug.) 1
Grounding cable 1
Software on USB flash-drive 1
Fuses (250V/3A) 2
Paper roll (inside the printer) 1
C-100 calibration kit Optional