Low Voltage and PAT testing

Megger offers a wide range of tough, high quality hand-held instruments which are used to test electrical wiring and other components in domestic, commercial and industrial facilities and other general business operations to the 17th Edition of the wiring regulations. Applications for these instruments include insulation testing, continuity testing, earth testing, loop testing and RCD testing.To assist you in testing appliances to the 4th Edition of the code of practice for in-service inspection and testing of electrical equipment there is a range simple and complex portable appliance tester (PAT). Additionally there is a range of accessories to make jobs more convenient. With the broadest, most diverse choice of instruments in the industry, Megger is truly your single source for electrical testing needs.

Cable test equipment

Electricity networks have had to become more flexible, reacting more quickly to the changes and needs of higher performance. This demand for flexibility is especially true where multiple generation sources occur, such as the intermittent power from renewables like solar and wind energy. While modern SMART grid technology can quickly identify faults in sub-station and generating units, cable faults can still occur anywhere on the network. Quickly locating a cable fault for repair is the top priority for avoiding lengthy restoration times. In the first place, this will be especially impactful on electrical utility reliability indices. These indices include SAIDI, the System Average Interruption Duration Index, which measures the total duration of an interruption for the average customer during a certain time period, and SAIFI, the System Average Interruption Frequency Index, which is found by dividing the total number of customers interrupted by the total number of customers served.

Activities centred on cable-related maintenance include:

  • Cable fault location: where a cable has failed and testing is done to locate the fault
  • High voltage testing; proof testing (withstand testing) is used to determine whether the cable can withstand an applied test voltage (usually greater than the operating voltage) for a specified period of time without any breakdown of the insulation
  • Cable diagnostics; predictive testing – used to recognise the aging and general quality of the cable’s overall insulation

Portable VLF cable test sets

The portable VLF test sets are used for testing of medium voltage cables with extruded insulation (XLPE-, EPR-insulation) in acc. to DIN VDE 0276/620, CENELEC HD 620 S1 or IEEE 400.

VLF is the very best and most effective method for insulation testing of medium voltage power cables with extruded (plastic) insulation. Using 0.1 Hz VLF test voltage, weak spots in XLPE, PE and also oil impregnated paper insulated cables are quickly brought to a controlled breakdown without causing additional damage or aging to the remaining cable insulation.

Cable sheath test with direct voltage is possible as well.