Table of Contents

Overview: Transformer Oil Dielectric Strength Tester

This intelligent automatic tester is specially developed to measure breakdown voltage of transformer insulating oil for power system preventive maintenance. Controlled by microprocessor, it can automatically finish boosting, stirring, standing, data calculation and printing within 0~80kV testing range.

With large LCD display and Chinese menu guidance, it stores up to 100 groups of test data with power-off protection, shows ambient temperature and humidity in real time, and prints test results via built-in thermal printer. Uniform 50Hz voltage lifting ensures high test accuracy, widely used to check oil dampness, impurity contamination and aging status so as to protect oil-filled high voltage electrical equipment.

Product Features

Equipped with a microprocessor, the instrument automatically completes voltage boosting, holding, stirring, standing still, calculation and printing procedures, and is capable of cyclic withstand voltage tests for insulating oil within the range of 0 ~ 80kV.
Adopts large-screen liquid crystal display with Chinese menu prompts for intuitive operation.
Extremely user-friendly: operators only need simple parameter settings, then the device will finish the withstand voltage test for one oil sample automatically as configured. It automatically stores breakdown voltage values of 1~6 tests and cycle times. After testing, the built-in thermal printer outputs each breakdown reading and the average value.
Data retention upon power failure: it can save up to 100 groups of test results, and displays real-time ambient temperature and humidity.
Controlled by single-chip microcomputer to realize uniform voltage rise; the output voltage frequency is precisely stabilized at 50Hz for stable and controllable whole testing process.

Transformer Oil Dielectric Strength Tester Technical Specifications

Parameter	Technical Index
Output Voltage	0 ~ 80kV (Optional)
Voltage Distortion Rate	< 3%
Voltage Rise Speed	0.5 ~ 5kV/s (Adjustable)
Standing Time	15min (Adjustable)
Voltage Rise Interval	5min (Adjustable)
Voltage Rise Times	1 ~ 9 times (Optional)
Booster Capacity	1.5kVA
Measurement Accuracy	±3%
Power Supply Voltage	AC 220V±10%, 50Hz±1Hz
Power	200W
Operating Temperature	0℃ ~ 45℃
Operating Humidity	< 75% RH
Overall Dimensions	465×385×425 mm

Packing List

Item No.	Description	Quantity	Unit
1	Main Unit of Transformer Oil Dielectric Strength Tester	1	Set
2	Standard Oil Test Cup & Electrodes Assembly	1	Set
3	Power Cord	1	Piece
4	Grounding Wire	1	Piece
5	Thermal Printing Paper	5	Rolls
6	English & Chinese Operation Manual	1	Copy
7	Factory Calibration Certificate	1	Copy
8	Product Warranty Card	1	Copy
9	Shockproof Portable Carrying Case	1	Piece

FAQ: Transformer Oil Dielectric Strength Tester (BDV Tester)

Q1: What is Transformer Oil Dielectric Strength Tester?

A: It is an automatic high-voltage test instrument to measure Breakdown Voltage (BDV) of insulating oil. It applies continuously rising AC high voltage to oil sample until electric breakdown/arc occurs; the breakdown voltage value reflects oil insulation capacity, used to judge moisture, particle contamination & aging degree of transformer oil.

Q2: Why do we need to test transformer oil dielectric strength regularly?

Detect free water, dust, fiber, carbon particles inside oil (the top cause of insulation failure)
Prevent internal arc discharge, winding breakdown & transformer sudden outage
Meet power industry maintenance specifications & official inspection requirements
Guide oil filtration, dehydration or oil replacement to extend transformer service life

Q3: What is the standard electrode gap for routine testing?

A: Default standard gap is 2.5 mm regulated by IEC 60156; adjustable gaps (1.0mm/2.0mm/4.0mm) are optional for special test demands.

Q4: How many breakdown tests shall be done for one oil sample?

A: International standards require 6 consecutive breakdown cycles on the same oil cup; the arithmetic average of 6 results is the final official BDV test report value.

Q5: What are the qualified BDV thresholds for new & in-service transformer oil?

A (2.5mm gap, IEC standard):

New unused transformer oil (HV/UHV transformer ≥69kV): ≥60 kV
New oil for distribution transformer ≤69kV: ≥50 kV
Healthy running in-service oil: 35~45 kV
Warning range: 30~35 kV (need dehydration & filtration soon)
Unsafe limit: ＜30 kV (immediate oil treatment or replacement required)

Q6: Does oil temperature affect breakdown voltage test results?

A: Yes. BDV rises obviously with temperature increase. All test reports must record sample temperature; comparison of historical data must be under the same temperature condition to avoid misjudgmentMegger.

Q7: What types of insulating liquids can this tester measure?

A: Applicable to mineral transformer oil, natural ester oil, synthetic ester oil, silicone insulating oil, widely used for power transformers, bushings, high-voltage switchgears, reactors insulating fluid testingMegger.

Q8: What international standards does the instrument support?

A: Pre-programmed test modes for IEC 60156, ASTM D877, ASTM D1816, GB/T 507, users can switch standards with one click on the touch panel.

Q9: Why are my test results unstable & fluctuate greatly each time?

Main causes:

Test cup/electrode not thoroughly cleaned, residual old oil & impurities remain
Air bubbles trapped inside oil sample before testing
Fingerprint grease attached on electrode surface
Electrode spacing deviates from standard 2.5mm
Oil sample absorbs moisture during sampling & transportation

Q10: Why is the measured BDV value continuously lower than standard?

A: Top influencing factors in sequence:

Excessive free moisture inside oil (most primary reason)
Suspended fine particles, paper fiber, metal debris & carbon dust
Oil oxidation aging, increased acidity
Dissolved air inside oil creates tiny voids

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