Siemens ISGS SG8158-00 - Manual (Page 40)

Control & Communications
34 Siemens Energy & Automation, Inc.
6.4 Trip Contacts
The ISGS relay offers up to three trip contacts which are
monitored by the microprocessor. Trip contacts may be con-
figured by the user to trip the relay based on any of a number
of functions. Trip contact reaction time is about 4.5 ms.
The relay displays the options at each matrix position in the
sequence listed in the table below.
6.5 Comm Events
Protective functions are internally generated events that can
trip a relay. For the protection to function properly, the pro-
cessor interprets these events (inputs) and makes a decision.
Communication (Comm) events are externally generated
messages that can trip a relay without any interpretation.
This remote communication allows Comm events to control
outputs (contacts), such as opening a breaker; or switch
parameter sets if matrixed to a binary input. Comm events
are sent from a PC or other devices on the RS-232 or
RS-485 networks.
Comm events can be blocked (disabled) with binary inputs to
prevent remote parameterization during service periods or as
a general safety measure. Refer to the list of binary inputs in
Section 6.2.
6400 Trip Contacts
Address Para-
meter
Matrix
Position
Option Option (cont.)
6401 Contact 1 001
to
020
(Options
apply to
each
matrix
position)
not matrixed
BI1
BI2
BI3
BI4
OC Trip
NonOC Trip
Relay Tripped
50HS Trip
50HSN Trip
81O Trip
81U Trip
47N Trip
50 Trip
50N Trip
51 Trip
51N Trip
67 Trip
67N Trip
27 Trip
59 Trip
47 Trip
OvrBrOps PU
OBrAmps PU
OvrAmps-
Dmd PU
OkWDmd PU
OvrkVAR PU
OvrkVA PU
PFLag PU
PFLead PU
50BF Trip
TrScMon PU
TrCoilCont PU
BrMech PU
CommEvent 1
CommEvent 2
CommEvent 3
CommEvent 4
CommEvent 5
6402 Contact 2 001-020 (same as Contact 1 above)
6403 Contact 3 001-020 (same as Contact 1 above)
6.6 Breaker Monitoring
To increase the security of the protective system, it is helpful
to monitor several parameters directly from the switchgear.
The ISGS relay can monitor the components such as the 52a
and the 52b switches, the traditional circuit breaker position
lamps, and the tripping voltage supply.
The 52a and 52b switches have a total of four possible posi-
tion combinations which can be decoded as illustrated in
Table 6.1. The 52a and 52b switches referred to are those
which traditionally provide indication of circuit breaker posi-
tion (52b) and trip coil continuity (52a). All error reporting can
be enabled and disabled, and the actions to be taken are
configurable.
The ISGS relay monitors:
•
breaker position
• trip coil continuity
• trip source impedance.
Breaker position is sensed through dedicated binary inputs
that monitor the 52a and 52b switches on the breaker mech-
anism (breaker mounted). Trip coil continuity is monitored by
continually sensing a current that flows through the trip coil.
Trip source impedance is checked using a switchable elec-
tronic load across the trip voltage supply.
Exceptions to the normal operating conditions include the
presence of push-to-test switches across either the
a-switch, b-switch, or both. A push-to-test switch across the
b-switch will produce a false indication of a breaker mecha-
nism error when the breaker is actually closed. A push-to
test switch across the a-switch (and hence across the trip
solenoid) will produce a false indication of a breaker mecha-
nism error when the breaker is actually closed.
Table 6.1 52a and 52b Switches Decoding
52a Switch
Position
52b Switch
Position
Condition Registered
Open Open Trip Coil Continuity Error, or
Breaker Withdrawn
Open Closed Circuit Breaker Open
Closed Open Breaker Closed
Closed Closed Circuit Breaker Mechanism Error
8300 Breaker Monitoring
Address Function/
Parameter
Options
8301 TripSrcImp Enabled or Disabled
8302 TripSrcFail Yes or No
8303 TrpCoil Cont Enabled or Disabled
8304 TrpCoilFail Yes or No
8305 BrkrMech Enabled or Disabled
6
isv3o_1.bk : isv3oc&c.frm Page 34 Wednesday, August 7, 1996 10:51 AM