Technical Reference Manual, General; High-Speed Power Output (Hspo); Single-Pole Power Outputs (Po) - ABB REX 521 Technical Reference Manual, General

REX 521
4.1.8.1.
4.1.8.2.
24
Protection Relay

Technical Reference Manual, General

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.
HSPO1
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.
HSPO1
Fig. 4.1.8.1.-2 High-speed single-pole power output (HSPO)

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.
+
CB
-
+
CB
-
1MRS 751108-MUM
Cbcoilrex
doubpolerex