Power Quality/Factor
Transformers
Switch Gear 11-145kV
Ancillary Equipment
Consulting
Protection Monitoring
Oil Analysis, Transformer Oil Testing & SF6 Gas Testing
Mahanga Holdings Limited are the sole representative of TJ|H2b Analytical Services Pty Ltd in New Zealand.

TJ|H2b Analytical Services, Inc. is an independent analytical laboratory and consulting firm that specialises in diagnostic testing of oil, gas and other insulating materials used in transformers, power circuit breakers and load tap-changers. They are the industry leaders in the development and application of condition-based maintenance programs for electric utilities, industrial high-voltage power users and service companies.
We can provide all lab tests and also stringent diagnostic testing on transformers, on-load tap changers, oil circuit breakers and SF6 applications.

  • DGA
  • Acidity
  • Inter Facial Tension
  • Moisture
  • Breakdown Voltage
  • PCB analysis & test
  • Colour
  • DDF & Resistivity (at one specified temperature)
  • Furfurals (Furan)
  • Degree of Polymerization
  • Particle Count
  • Condition Code (1-4 *)
  • Laboratory Recommended Procedure
  • Recommended Retest Period
  • Transformer Condition Assessment TCA™
  • Breaker Oil Analysis BOA™
  • Tapchanger Activity Sigature Analysis TASA™
  • Breaker Gas Analysis BGA™
  • Live Tank Oil Sampling (LTOS™) for Ring Main Units
  • Turbulent Flush Sampling System TFSS™

When you order your test kits from Mahanga Holdings Limited, each kit comes with the following items:

  • Individualy packaged syringes
  • Oil sample bottles
  • Oil sample clear plastic tubes
  • Associated paperwork
  • Detailed sampling instructions (If required)

We supply seperate sampling tubes to ensure the chances of cross contamination between samples is minimised. TJ|H2b use full gas extraction methods to ensure repeatability and accuracy in tests. When you consider that the assets being tested are the most important items on your grid, you should expect no less.

Please contact us direct for very competitive prices and turn around times on oil samples and analysis.
INTRODUCTION OF LIVE TANK OIL SAMPLING (LTOS)

Live Tank Oil Sampling (LTOS) has been devised by EA Technology in the UK as a low cost, safe and reliable method of obtaining an oil sample from 11kV oil filled switchgear, with the minimum of time and interference to the power supply.

This service will be supportive of our already popular Transformer Condition Analysis (TCA) and Tap Changer Activity Signature Analysis (TASA) services being utilised throughout New Zealand

The accompanying extract, from a recent seminar paper by Anne McIntosh of EA Technology, outlines the procedure and benefits of the LTOS test.

We feel sure that this service will be of considerable benefit in informing customers of the healthy, or otherwise, condition of Ring Main Units and similar equipment, with minimal or no shutdown time.

Sample Data Sheets and Instructions

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