Protections; Pole Discordance Protection - ABB REC 561 User Manual

1MRK 580 150-XEN
Page 6 - 46

4.2.10Protections

4.2.11Pole discordance
protection
Apparatus control
If the autoreclose function is used with external selection relays according
to the principles described in Fig. 6 and Fig. 7 in "BAYCON" on page 13,
the input AR_SEL in SWICON is used to select the breaker without any
condition checks. When AR_SEL is set, the output SEL_CLOS is acti-
vated directly. The close signal from the auto-reclose function is con-
nected via the OR gate for close commands in a normal way.
The protection functions are normally running independent of the appara-
tus control modules. The trip signals from the protection modules
included in REC 561 are connected via the tripping logic function. If a
three-phase circuit breaker is used, the GTRIP general trip signal from the
tripping logic can be connected to the same open output as for the manual
control from SWICON via an OR gate (see Fig. 33). Here, the OR gate
must have the same execution cyclicity as the tripping logic module.
Circuit breaker
SWICON
SEL_OPEN
EXE_OPEN
Trip_Logic
GTRIP
Fig. 33 Connections between the tripping logic and the apparatus con-
trol modules
The pole discordance function included in the SWICONA(B) is based on
checking the positions of the auxiliary contacts on the breaker. The con-
nection of the trip signal is made according to Fig. 34 and to the output
board in the same way as for other protections (See "Protections" on
page 46.). The T_POL time delay to trip is set to 2 seconds as a default
value. Since only one tripping logic is available in the control terminal,
the POL_DISC output is connected directly to the OR gate for the open
command, if more than one circuit breaker is included in the terminal.
Circuit Breaker
SWICON
SEL_OPEN
EXE_OPEN
POL_DISC
2
T_POL
Trip_Logic
GTRIP
EXTTRIP
Fig. 34 Connection of the pole discordance trip from SWICON via the
tripping logic
ABB Network Partner AB
OPEN
≥1
&
OPEN
≥1
&
Version 1.0-00
To output board
(X80150-33)
To output board
(X80150-34)