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The delay the K27/Q1D relay useful for avoiding untimely opening the emergency
line breaker, which are caused small voltage gaps. position, Q61 breaker must open
2) close the Q61 breaker
3) wait for period time higher than the delay set the K27/Q2 relay
4) set the S43 selector-switch AUT. advisable set this
delay high values, order avoid unwanted changing-over when the normal supply
line unstable.
C) not connect isolate the breakers withdrawable plug-in version when the
S43 selector-switch AUT.
ABB SACE ISOMAX S6/S7 401533 L2994 /6
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CAPTION
A Automatic changing-over switchgear (for putting the system service see note D)
F 1-F2 Protective fuse-disconnectors
H/Q1 Lamp indicating breaker tripped through the overcurrent release
H/Q2 Lamp indicating breaker tripped through the overcurrent release
K27/Q1 Voltage measuring relay for emergency supply line
K27/Q1D Auxiliary relay delayed de-energization (see note F)
K27/Q2 Voltage measuring relay for normal supply line
K27/Q2D Auxiliary relay delayed de-energization (see note F)
K27/Q2E Auxiliary relay delayed energization (see note F)
K51 Overcurrent microprocessor based release type PR211 PR212 (for resetting see
note B)
K83 Relay for the automatic changing-over
KO Opening relay and spring-charging device, with stay put make contact disengaged
by cam the motor operator
M Motor for the breaker opening and for closing springs charging
Q1 breaker for emergency supply line
Q2 breaker for normal supply line
Q61 Miniature breaker with thermomagnetic overcurrent relay for isolation and protection
of the auxiliary circuits
S 1-S Contacts operated cam the motor operator
S2 Contact operated cam the motor operatorand key lock (if provided)
S43 Two positions selector-switch make the automaticchanging-over operative
SY/Q1 Contact signalling breaker tripped through the overcurrentrelease (for resetting
see note (the opening and undervoltaqe releases must not beprovided)
SY/Q2 Contact signalling breaker tripped through the overcurrentrelease (for resetting
see note (the opening and undervoltaqe releases must not beprovided)
T l/.REPRESENTED OPERATIONAL STATE
The diagram indicates the following conditions:
- breakers off and connected §
- circuits de-energized
- motor operators with charged springs
- releases not tripped *
§ The diagram indicates breakers withdrawable plug-in version butit may applied
also breakers fixed version. position.
The delay the K27/Q2E relay, the other hand, determines the delay time the beginning
of the changing-over sequence between the emergency supply line and the normal one, as
regards the moment whichthe normal supply voltage returns.
F) The programming delay times between receiving signals voltage absence orpresence
and sending off the opening and closing controls the breakers, must carried out
using the timers K27/Q1D, K27/Q2D and K27/Q2E relays. However possible use equipment other than but equivalent
to those suggested, which can found more easily the customer.
B) case tripping the release one breakers, for resetting setthe S43 selector-
switch MAN. position.
D) When putting the automatic changing-over service, carry out the following operations:
1) set the S43 selector-switch MAN.
EQUIPMENT LIST
As far the list the equipment suggested carry out the automatic changing-over switchgear,
please see the drawing TN10455. This type delay useful
for avoiding untimely changing-overs, which are ccused smgll voltage gaps.
In particular the delay the K27/Q2D relay determines the delay time the beginning
of the changing-over sequence between the normal supply line and the emergency one, as
regards the moment whichthere normal supply voltage. Current transformers feeding overcurrent relay
X2 Connector for the breaker auxiliary circuits
YC Shunt closing release
NOTES
A) For the breakers auxiliary circuits see 401506 diagram.
* The diagram indicates breakers equipped with overcurrent microprocessor based release
type PR211 PR212 but may applied also breakers without overcurrent relay
(switch-disconnectors). position
E) The auxiliary voltage supplies shall safety type (not network). position, reset the tripped breaker manually and then set the S43
selector-switch AUT.
For breakers with overcurrent release see the circuits indicated sheet2, for breakers
without overcurrent release see the circuits indicated sheet 3
