Signal Output Contacts - ABB RELION 620 Series Technical Manual

Section 3
Basic functions
3.10.2
94
HSO1
HSO2
HSO3
GUID-D63F0E1F-73CD-4CD2-AAD1-6E2510F0A308 V1 EN
Figure 25: 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.
When the application requires high making and breaking duty, it is
possible to use HSO contacts in the protection relay or an external
interposing auxiliary relay.
X105
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1MAC504801-IB E
620 series ANSI
Technical Manual