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Fault & Transient Recorder

The EM920 provides state-of-the-art fast transient recording capability. Transient pulses as short as 17 microseconds can be reliably recorded and analyzed. The EM920 can record such short pulses by a separate electronic channel with a sampling rate of 1024 samples/cycle. The transient amplitude is recorded relative to the ground in accordance with the strict definitions of power quality standards (EN 50160). The instrument can measure transient pulses with an amplitude of up to 2 kV

(withstands up to 6 kV). Four voltage waveforms (3 phases and neutral relative to the ground) are recorded at 1024 samples/ cycle to complement the waveforms recorded by the power quality channel. The fault recorder provides 4 measured and recorded currents (including measured neutral current) up to 50A (10 In). The event log is complemented by a fault log and full length waveform recording.

SHORT TRANSIENT EVENTS

OSCILLATORY

Digital Fault Recorder

Fault detection using default limits

Programmable fault thresholds and hysteresis

Up to 50 amp fault currents (10xIn)

Zero-sequence current and voltage calculations

Current and voltage unbalance

Under voltage, neutral current

Ready for use fault reports — fault current magnitude and duration, coincident voltage magnitude, fault waveforms and RMS trace

Reliable recording of short transients—20μs at 50Hz (17μs at 60Hz)

Measures up to 2kV impulses. Withstands up to 6kV

4 fast waveform recorders: Sampling rate of up to 1024 samples per cycle, 3 phase and neutral voltage waveforms

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