Functional Diagrams For Protection - ABB RELION 615 Series Applications Manual

1MAC109016-MB C
3.7.3.1
REF615 ANSI
Application Manual

Functional diagrams for protection

Four overcurrent stages for phase, neutral and ground are offered for non-directional
overcurrent and short-circuit protection. The non-directional high stage
PHHPTOC1_50P-1 is blocked by cold load detection logic. The cold load detection logic
starts from closing of the circuit breaker and is active during set time. The cold load
detection logic's active time can be set in a resolution of minutes or seconds to the
functions TPSGAPC1 and TPMGAPC1.
For dual tie breaker application, since two breakers are in series, both the breakers must
be closed to initiate the cold load pickup timer.
The directional overcurrent and short circuit protection are blocked by default also if the
fuse failure situation is detected.
The inrush detection block's INRPHAR1_INR-1 output BLK2H offers the possibility to
either block the function or multiply the active settings for any of the shown protection
function blocks. By default, the output BLK2H is not connected to anywhere.
All trip signals are connected to the Master Trip and also to the alarm LEDs. The pickup
information of all overcurrent functions is collected to the variable
OC_PICKUP_ALARM and connected to the disturbance recorder. This signal can be
mapped to the signal outputs depending on the application needs.
REF615 standard configurations
Section 3
171