CHAPTER 6: SETPOINTS S3 PROTECTION
345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 6–37
S3 Protection
The 345 protection elements are organized in two identical setpoint groups: Setpoint
Group 1 and Setpoint Group 2.
Figure 6-15: Main Protection menu
Breaker tripping
Tripping the winding breakers in the 345 relay is performed by energizing Output Relay 1
(RLY1 W1 BKR TRIP) and Output Relay 2 (RLY2 W2 BKR TRIP). Most of the 345 protection,
control, and monitoring elements can be configured to trip one of the two winding
breakers, or both breakers together. In these cases, selecting to trip only one specific
breaker, or both together, can be configured in the menu of the element as follows:
1. Set the main function setpoint in the element menu (for example, PH TOC1 FUNCTION)
to Trip.
This adds the setpoints RLY1 TRIP W1 BKR and RLY2 TRIP W2 BKR used for tripping the
Winding 1 and Winding 2 breakers respectively. These setpoints are only visible when
the FUNCTION setpoint is set to Trip, and supports triping individual breakers.
2. Set one or both of the setpoints RLY1 TRIP W1 BKR and RLY2 TRIP W2 BKR to Operate
to enable triggering the corresponding output relay or relays upon operation of the
element.
NOTE:
A few 345 elements, such as Percent Differential, Instantaneous Differential, Restricted
Ground Fault, and Thermal Overload, can only trip both breakers together. Elements that
only trip both breakers specify this behavior in the main FUNCTION setpoint description.
For example, the following screenshot shows the EnerVista 3 Series Setup software menu
for Phase Timed Overcurrent (51P), with the function setpoint Phase TOC1 Function set to
Disabled.
S3 SETPOINT GROUP 1/2
XFMR PCNT DIFF
XFMR INST DIFF
RESTD GND FAULT1
RESTD GND FAULT2
THERMAL OVERLOAD
PHASE TOC1
PHASE TOC2
PHASE IOC1
PHASE IOC2
GROUND TOC1
GROUND TOC2
GROUND IOC1
GROUND IOC2
NEUTRAL TOC1
NEUTRAL TOC2
NEUTRAL IOC1
NEUTRAL IOC2
NEG SEQ TOC1
NEG SEQ TOC2
NEG SEQ IOC1
NEG SEQ IOC2
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