The 100ADM-F filter unit reduces the level of current harmonics when testing electro-mechanical protection relays. It is designed for use with our range of secondary injection test sets.
All electromechanical protection relays have iron cores that saturate and distort the test current under high overload test conditions. This distortion causes significant errors in the measured trip time of these relays during testing. Distortion of the waveform can be a particular problem with disc induction type over-current and sensitive earth fault relays.
For example, testing a CDG11 disc induction over-current relay without a filter causes significant timing errors. The results below show the errors for a 1.3s 1A CDG11 over-current relay on its 0.5A plug setting, tested at 5A.
The 100ADM-F has nine current ranges covering 0.25A to 100A and is supplied in an insulated case complete with protective cover and carrying strap.
Accessories
Current monitor plug and lead
Optional Accessories
100AL lead set
Temperature Range
Storage -20°C to 60°C Operating 0°C to 45°C
Dimensions Weight
340 x 230 x 330mm 15.6kg
Frequency
The unit may be used at either 50Hz or 60Hz, selectable by a switch on the front panel.
Current Monitor
A current monitoring output is provided that gives an output of 0-100mA corresponding to the rated current for the range.
The waveforms below show the current and voltage for a disc induction relay supplied from a 100ADM.
Current Ranges and Ratings
Range Selection
The lower ranges (0.25A-50A) are selected by a switch, and the highest current range (100A) is selected by a terminal.
Filter Unit Impedance
Features
• Forces test current to a sinusoid
• Improves timing accuracy when testing electromechanical relays
• 0.25A-100A ranges
• High overload capability
• 50/60Hz operating frequency
• High efficiency
