ABB RER620 Technical Manual

Section 6 1MAC309294-MB F
Condition monitoring functions
360 RER620
Technical Manual
6.1.4.1 Circuit breaker status
The circuit breaker status subfunction monitors the position of the circuit breaker, that is,
whether the breaker is in an open, closed or intermediate position. The operation of the
breaker status monitoring can be described by using a module diagram. All the modules in
the diagram are explained in the next sections.
Figure 193: Functional module diagram for monitoring circuit breaker status (Typical
pole, shown for Phase A)
Phase current check
This module compares the three phase currents with the setting ACC stop current. If the
current in a phase exceeds the set level, information about phase is reported to the contact
position indicator module.
Contact position indicator
The circuit breaker status is open if the auxiliary input contact POSCLOSE_A(_B,_C)
is low, the POSOPEN_A(_B,_C) input is high and the current is zero. The circuit
breaker is closed when the POSOPEN_A(_B,_C) input is low and the
POSCLOSE_A(_B,_C) input is high. The breaker is in the intermediate position if both
the auxiliary contacts have the same value, that is, both are in the logical level “0”, or if
the auxiliary input contact POSCLOSE_A(_B,_C) is low and the
POSOPEN_A(_B,_C) input is high, but the current is not zero.
The status of the breaker is indicated with the binary outputs OPENPOS_A(_B,_C),
INVALIDPOS_A(_B,_C), and CLOSEPOS_A(_B,_C) for open, intermediate, and
closed position respectively.
6.1.4.2 Circuit breaker operation monitoring
The purpose of the circuit breaker operation monitoring subfunction is to indicate if the
circuit breaker has not been operated for a long time.
The operation of the circuit breaker operation monitoring can be described by using a
module diagram. All the modules in the diagram are explained in the next sections.
Contact
position
indicator
POSCLOSE_A
POSOPEN_A
CLOSEPOS_A
OPENPOS_A
Phase
current
check
INVALIDPOS_A
I_A
This subfunction requires two position inputs POSOPEN_A(_B,_C) and
POSCLOSE_A(_B,_C) from the circuit breaker.

ABB RER620 Specifications

General

Brand	ABB
Model	RER620
Category	Controller
Language	English