Logic Inputs And Output Relays; Logic Inputs; Output Relays - GE TRANSFORMER MANAGEMENT RELAY 745 Instruction Manual

8.3 LOGIC INPUTS AND OUTPUT RELAYS

8.3LOGIC INPUTS AND OUTPUT RELAYS
1. Prior to energizing any of the Logic Inputs, ensure that doing so will not cause a relay trip signal to be issued beyond
the blocking switches. These should have been opened prior to starting on these tests. If you wish, you can disable the
Logic Input functions by setting:
S3 LOGIC INPUTS
2. Connect a switch between Logic Input 1 (Terminal D1) and +32 V DC (Terminal D12), as shown above (alternatively,
use the wet contact approach shown in the same figure). Logic Inputs can be asserted with either an opened or closed
contact, per the user choice. Verify/set the type of Logic Input to be used with the following setpoint:
S3 LOGIC INPUTS
3. Display the status of the Logic Input using the
4. With the switch contact open (or closed), check that the input state is detected and displayed as "Not Asserted".
5. Close (open) the switch contacts. Check that the input state is detected and displayed as "Asserted".
6. Repeat for all the relay logic inputs which are used in your application.
1. To verify the proper functioning of the output relays, enable the Force Output Relays function by setting:
S6 TESTING

OUTPUT RELAYS

The Test Mode LED on the front of the relay will come ON, indicating that the relay is in test mode and no longer in ser-
vice. In test mode all output relays can be controlled manually.
8
2. Under
S6 TESTING
3. Using a multimeter, check that all outputs are de-energized. For outputs 2 to 5, the outputs are dry N.O. contacts and
for Outputs 6 to 8, the outputs are throw-over contacts (form C). Output 1 is a solid state output. When de-energized,
the resistance across E1 and F1 will be greater than 2 MW; when energized, and with the multimeter positive lead on
E1, the resistance will be in the 20 to 30 kW.
4. Now change the
FORCE OUTPUT 1
5. Using a multimeter, check that all outputs are now energized.
6. Now return all output forcing to "De-energized" and disable the relay forcing function by setting
RELAYS FORCE OUTPUT RELAYS FUNCTION
7. All the output relays should reset.
8-6
Courtesy of NationalSwitchgear.com
Figure 8–3: LOGIC INPUTS
LOGIC INPUT 1 (16) LOGIC INPUT 1(16) FUNCTION:

LOGIC INPUTS

LOGIC INPUT 1 (16) / INPUT 1(16) ASSERTED STATE
A1 STATUS
FORCE OUTPUT RELAYS FUNCTION
set the
OUTPUT RELAYS FORCE OUTPUT 1
to
FORCE OUTPUT 8
to "Disabled"
745 Transformer Management Relay
"Disabled"
LOGIC INPUTS LOGIC INPUT 1(16) STATE
: "Enabled"
to
FORCE OUTPUT 8
setpoints to "Energized".
8 COMMISSIONING
8.3.1 LOGIC INPUTS
actual value.
8.3.2 OUTPUT RELAYS
setpoints to "De-energized".
S6 TESTING OUTPUT
GE Multilin