ABB REX 521, Техническое справочное руководство, общее

Страница: 7 / 64

1MRS 751108-MUM Protection Relay
Technical Reference Manual, General
REX 521
7
2.2. Application
The REX 521 is designed for protection of incoming and outgoing feeders in
medium voltage distribution substations. Further, the relay can, e.g., be applied to
back-up protection of power transformers and back-up for high voltage line
protection relays.
Several standard configurations are available for the protection relay. Please, refer to
REX 521 Technical Reference Manual, Standard Configurations
(1MRS 751802-MUM).
2.3. Hardware versions
Table 2.3.-1 Hardware versions of the REX 521
Relay type REX 521
Version name Basic Medium High Sensor
R
EX5
21x
B
xxx
R
EX5
21x
Mx
xx
R
EX5
21x
H
xxx
REX5
21x
Sxx
x
Transformer modules (MIM)
1 1 1 1
Transformers
• Current transformers 1/5 A 4 4 4 1
• Current transformers 0.2/1 A 1 1 1
• Voltage transformers 100 V 1 4 1
Sensor channels
• Current sensor inputs 3
• Voltage sensor inputs 3
Main CPU modules
1 1 1 1
CPU_SP (SPA/ IEC plastic)
CPU_SG (SPA/ IEC glass)
CPU_LP (SPA/ IEC/ LON plastic)
CPU_LG (SPA/ IEC/ LON glass)
Power supply modules
1 1 1 1
PS_87H (DItresh.=80 Vdc)
PS_87L (DItresh.=18 Vdc)
Display module
1 1 1 1
2 x 16 character display
Digital inputs
9
High-speed power outputs
1
Power outputs (PO)
3
Signalling outputs (SO)
2
IRF outputs
1
Trip-circuit supervision (TCS)
1