ISA T1000 PLUS - Thermal Relay Testing

DOC. MIE91093 Rev. 1.34 Page 132 of 145
 Slowly increase the current output until the relay trip
NOTE
The relay trip can be achieved in two ways:
1. Telephone communication with the control room
2. Connect the trip command, available at the CB control box,
to digital input STOP of the T1000 PLUS
This test is performed with a single ended injection. No need
to synchronize with the remote end.
1.16.4.2 Internal / External fault
This test is performed with a double ended injection. You need
to synchronize with the remote end.
1. Press On + Time (Left Arrow) on the T1000 PLUS.
2. Slowly increase the current output in one and only until the
relay trips
3. Record the measured tripping current
4. Set the same current value on the other end
5. Check if the relay trips:
Start the injection with
the GPS
The relay trips
Internal
fault
Reverse current by 180°
using HCSW
The relay does
not trip
External
fault
6. You may have get the following results depending upon the
original connection
Start the injection with
the GPS
The relay
doesn’t trip
External
fault
Reverse current by
180° using HCSW
The relay trips
Internal
fault
After this, the test can be considered complete.
1.17 THERMAL RELAY TESTING
Thermal relays are of different types, according to the
measuring method, that can be:
. Thermal image;
. Temperature measurement.