T&D World Magazine
Portable Oil Test Sets Measure Breakdown of Insulating Oils

Portable Oil Test Sets Measure Breakdown of Insulating Oils

Featuring rugged yet lightweight construction, Megger’s new OTS80PB 80 kV and OTS60PB 60 kV portable oil test sets make accurately measuring the breakdown voltage of insulating oils a fast and straightforward task, whether the work is carried out in the field or in the laboratory.

Suitable for use with mineral, silicon, high molecular weight hydrocarbon (HMWH) and ester – both synthetic and natural - insulating liquids, the new test sets offer a choice of fully automatic operation with preloaded international test standards or user-configured test sequences to suit special requirements. The user interface is highly intuitive, and results are shown on a bright color display that is easy to read even in direct sunlight.

As an aid to making accurate and repeatable measurements, the OTS80PB and OTS60PB test sets incorporate a precision adjusting system for electrode spacing, which has a locking facility to ensure that the spacing cannot be accidentally altered during testing. An ultra fast trip detection circuit with direct measurement of both voltage and current is provided, and the instruments also include facilities for measuring the temperature of the test sample.

The OTS80PB and OTS60PB have been designed with a transparent lid of the test chamber, which enables the progress of the test and the colour of the oil to be readily observed. These versatile testers also use a novel type of moulded test vessel that is easy to clean as well as being highly resistant to breakage and damage. As a further aid to cleaning, the test chamber is provided with a convenient oil drain.

Designed with safety in mind, Megger’s new portable oil test sets incorporate dual-redundant high-voltage cut-off circuitry that instantly switches off the HV supply if the lid to the test cell is opened. In addition, users can terminate a test at any time simply by pressing any of the buttons on the instrument’s keypad.

The test sets have three USB interfaces to allow the connection of PCs, USB flash drives, external printers and barcode scanners. They are supplied, at no extra charge, with a copy of Megger’s PowerDB Lite asset and data management software, which provides extensive facilities for downloading and printing results, and for generating reports.

The OTS80PB and OTS60PB are mains powered, but optional lead-acid for the OTS80PB or NiMH batteries for both models are available to allow fully portable operation. Other options include an internal printer, a motorised impeller system, a low volume (150 ml) test vessel and an accessory voltage check unit.

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