ABB REX 521 Technical Reference Manual, General

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1MRS 751108-MUM
Protection Relay
Technical Reference Manual, General
REX 521
4.1.8.1. High-speed power output (HSPO)
The high-speed power output HSPO1 can be connected as a double-pole output
where the object to be controlled (for example a circuit breaker) is electrically
connected between the two relay contacts, see the Figure 4.1.8.1.-1 below. The high-
speed double-pole power output is recommended to be used for tripping purposes.
Cbcoilrex
Fig. 4.1.8.1.-1 High-speed double-pole power output (HSPO)
The high-speed power output HSPO1 can also be connected as a single-pole power
output where the object to be controlled (for example a circuit breaker) is electrically
connected in series with the two relay contacts, see the Figure 4.1.8.1.-2 below.
doubpolerex
Fig. 4.1.8.1.-2 High-speed single-pole power output (HSPO)
4.1.8.2. Single-pole power outputs (PO)
The single-pole power outputs PO1...3 are outputs where the object to be controlled
is connected in series with two heavy-duty output relay contacts, see the Figure
4.1.8.2.-1 below. These outputs can be used for tripping purposes and for circuit
breaker and disconnector control. Two singe-pole outputs may be used to obtain
another double-pole output.
+
-
HSPO1
CB
+
-
CB
HSPO1

ABB REX 521 Specifications

General

Brand	ABB
Model	REX 521
Category	Other
Language	English