Signal Output Contacts; Internal Fault Signal Output Irf - ABB RELION Series Technical Manual

Section 3
Basic functions
3.11.2
3.11.2.1
84
HSO1
HSO2
HSO3
GUID-38EDD366-7456-4933-B49E-0F43FE1D6C39 V1 EN
Figure 28: High-speed power outputs HSO1, HSO2 and HSO3
The reset time of the high-speed output contacts is longer than that of the conventional
output contacts.
High-speed power contacts are part of the card BIO0007 with eight binary inputs and
three HSOs. They are optional alternatives to conventional BIO cards of the protection
relay.

Signal output contacts

Signal output contacts are single-pole, single (normally open/form A or change-over/
form C) signal output contacts (SO1, SO2,...) or parallel connected dual contacts.
The signal output contacts are used for energizing, for example, external low burden
trip relays, auxiliary relays, annunciators and LEDs.
A single signal contact is rated for a continuous current of 5 A. It has a make and carry
for 0.5 seconds at 15 A.
When two contacts are connected in parallel, the relay is of a different design. It has
the make and carry rating of 30 A for 0.5 seconds. This can be applied for energizing
breaker close coil and tripping coil. Due to the limited breaking capacity, a breaker
auxiliary contact can be required to break the circuit.

Internal fault signal output IRF

The internal fault signal output (change-over/form C) IRF is a single contact included
in the power supply module of the protection relay.
X110
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1MRS758755 A
REC615 and RER615
Technical Manual