Operating The Fault Recorder; Communicating With The Em720 - Satec Expertmeter EM720 Operation Manual

Chapter 2 Operating the EM720

Operating the Fault Recorder

Communicating with the EM720

Infrared Port
24
The recorder does not require any special setup above a
conventional Power Quality recorder setup for transient
overvoltages. Waveform log #3 is especially dedicated for
the fast transient recorder. It automatically stores 1-cycle
voltage transient waveforms sampled at a rate of 1024
samples/cycle whenever a transient overvoltage event is
detected.
Unlike a conventional Power Quality recorder that detects
and records transient
conductors and a neutral terminal (in 4LN3 and 3LN3
configurations), or between two phase conductors (in line-
to-line configurations), the fast transient recorder detects
transient overvoltages between phase conductors and a
ground terminal and between the neutral and a ground
terminal regardless of a wiring configuration.
See the EM720 Installation Manual for terminal location
and wiring diagrams. To help you check your voltage
connections, the EM720 provides 1-cycle phase RMS
voltages V1x through V3x, and 1-cycle neutral voltage
V4x relative to the ground terminal, that you can monitor
via PAS.
The programmable Fault recorder stores time-tagged fault
events into the fault event report. It can be triggered
externally through a digital input or internally from the
embedded fault detector.
The internal fault detector can automatically detect
different fault categories using the device's own sub-cycle
measurements. Fault
thresholds and hysteresis and can be user-adjusted for
specific substation conditions.
The Fault recorder is programmable for triggering the
Waveform and Data recorders to record input waveforms
and long-duration RMS trends during the time of a fault.
See Configuring the Fault Recorder
information on operation of the Fault recorder.
Communication with the EM720 is provided either via the
embedded optical
communication ports. See the EM720 Installation Manual
for the full list of the available communication modules
and communication options.
The EM720 has an optical infrared port for local meter
reading via a hand-held unit or a portable PC. The IR port
can be equipped with an IEC- or ANSI-compatible optical
head on your selection.
EM720 Power Quality and Revenue Meter
Operating the Fault Recorder
overvoltages
triggers have
in Chapter 5 for more
IR port, or via
between phase
programmable
the replaceable