Metering And Recording; User Interface; Event Record; Relay Front Panel - Toshiba GRT100 Manual

GRT100
The terminal blocks are located at the rear of the
relay providing connections for all input/output circuits.
The relay is housed in a type-A case, suitable for
either rack or panel mounting as shown in Figures 10
and 11.

METERING AND RECORDING

Metering and Monitoring
The following power system data is measured continuously
and displayed on the LCD on the relay fascia, at the
local PC, and the remote PC when connected.
Currents (phase, phase to phase, symmetrical
components)
Differential currents
Voltage (phase to phase)
Frequency
Currents, voltages and differential currents can be
indicated as primary or secondary values.
The user can monitor the following output and status
on the LCD and at local/remote PCs
Relay element output
Binary input/output

Event Record

The most recent 96 time-tagged events are stored
with 1ms resolution. Events recorded are as follows.
Tripping
Alarms
Change of binary input signal
Change of relay setting
Relay failure
Fault Record
A relay trip initiates fault recording. Time-tagged fault
data can be stored for the 8 most recent faults. Fault
record items are as follows.
Date and time
Operating phase
Tripping mode
Pre-fault and post-fault current data (phase, phase
to phase, symmetrical components)
Disturbance Record
The relay can record 22 analog and 30 binary signals.
The disturbance recorder is initiated by operation of
the overcurrent element and/or relay tripping. In respect
to analog data, phase currents, neutral current and
phase to phase voltage are recorded.
Pre-fault recording time is fixed at 300 ms, and post-
fault recording time can be set from 100 ms to 3 s.
The maximum number of stored records depends on
the post-fault recording time. In the case of a post-
fault recording time of 500 ms, up to 20 disturbance
records can be stored. The number of the recorded
data is displayed on the LCD.
Calendar and Time
A calendar and time are provided for time- tagging of
recorded data. Synchronisation with the GPS (Global
Positioning System) is possible using the IRIG-B port.

USER INTERFACE

Relay Front Panel

The relay front panel provides the following user
interfaces. Setting the relay and viewing stored data
are possible using the Liquid Crystal Display (LCD)
and operation keys.
- 40 character, 4 line LCD with back light
- 8 Light Emitting Diodes (LED) including 4 that are
configurable
- Operation keys
- RS232C port
- Monitoring jacks
Figure 8 shows the relay front panel.
Fig. 8 Relay front panel
6