Siemens siprotec 7SA522 User Manual

3 Mounting and Commissioning
412
7SA522 Manual
C53000-G1176-C155-3
Caution!
Also for tests on the local circuit breaker of the feeder a trip command to the surround-
ing circuit breakers can be issued for the busbar.
Non-observance of the following measure can result in minor personal injury or prop-
erty damage.
Therefore, primarily it is recommended to interrupt the tripping commands to the ad-
jacent (busbar) breakers e.g. by inrupting the corresponding pickup voltage supply.
Before the breaker is closed again for normal operation the trip command of the feeder
protection routed to the circuit breaker must be disconnected so that the trip command
can only be initiated by the breaker failure protection.
Although the following lists do not claim to be complete, they may also contain points
which are to be ignored in the current application.
Auxiliary Contacts
of the CB
The circuit breaker auxiliary contact(s) form an essential part of the breaker failure pro-
tection system in case they have been connected to the device. Make sure the correct
assignment has been checked.
External Initiation
Conditions
If the breaker failure protection is intended to be initiated by external protection devic-
es, each of the external initiation conditions must be checked. Single-pole or three-
pole tripping is possible depending on the setting of the breaker failure protection.
Note that the pole discrepancy supervision of the device or the breaker may lead to a
later three-pole trip. Therefore check first how the parameters of the breaker failure
protection are set. See Subsection 2.18.2, addresses  onwards.
In order for the breaker failure protection to be started, a current must flow at least via
the monitored phase. This may be a secondary injected current.
After every start, the message ´%)6WDUWµ (FNo 1461) must appear in the sponta-
neous or fault annunciations.
Only if single-pole starting possible:
• Single-pole starting by trip command of external protection in phase L1:
Binary input functions ´!%)6WDUW/µ and, if necessary, ´!%)UHOHDVHµ (in
or spontaneous or fault messages). Trip command (dependent on settings).
• Single-pole starting by trip command of external protection in phase L2:
Binary input functions ´!%)6WDUW/µ and if necessary ´!%)UHOHDVHµ (in
spontaneous or fault messages). Trip command (dependent on settings).
• Single-pole starting by trip command of external protection in phase L3:
Binary input functions ´!%)6WDUW/µ and, if necessary,´!%)UHOHDVHµ (in
spontaneous or fault messages). Trip command (dependent on settings).
• Three—pole starting by trip command of the external protection via all three binary
inputs L1, L2 and L3:
Binary input functions ´!%)6WDUW/µ, ´!%)6WDUW/µ and ´!%)6WDUW
/µ and, if necessary, ´!%)UHOHDVHµ (in spontaneous or fault messages). Trip
command three-pole.
For three-pole starting:
• Three-pole starting by trip command of the external protection:
Binary input functions ´!%)6WDUWSROHµ and, if necessary, ´!%)UHOHDVHµ
(in or spontaneous or fault messages). Trip command (dependent on settings).

Siemens siprotec 7SA522 Specifications

General

Brand	Siemens
Model	siprotec 7SA522
Category	Protection Device
Language	English