Megger S1 series high-voltage insulation testers

The S1-554 and S1-1054 high-voltage insulation testers deliver accurate readings even in noisy electrical environments, such as substation switchyards, using 4 mA noise rejection and hardware and software filtering.

The testers are claimed to deliver a higher charging current, which not only reduces the time needed for testing, but also minimises the risk of measurements inadvertently being taken before the test voltage has reached the value set by the user.

The S1-554 insulation tester offers a variable test voltage up to 5 kV and measures insulation resistance up to 15 TW, while the S1-1054 operates at voltages up to 10 kV, and measures resistance up to 35 TW.

The ability to measure such high resistances is an important aid for preventive maintenance, as it allows gradual deterioration of insulation to be detected before a total failure results.

Both testers have fully automated operation, with the test sequence initiated at the touch of a button, testing insulation resistance (IR), polarisation index (PI), dielectric absorption ratio (DAR), step voltage (SV) and dielectric discharge (DD).

The testers feature large digital/analog displays, which show voltage, leakage, capacitance and time constant and are easy to read in varying light conditions; test duration time; pass/fail alarm limit setting; real-time data output via RS232 and USB ports; integral memory to store test results for subsequent downloading and analysis; 'download manager' software; and mains/battery power.