Sensor Status; Multilevel Threshold Alarm Generation Monalm; Identification; Functionality - Hitachi Relion 650 Series Technical Manual

1MRK 511 557-UEN Rev. A
12.16.7.2

Sensor status

Only accurate measured values from the sensors are useful in optimizing controlled switching
performance. In case of a faulty sensor, wrong output values may even deteriorate the result. As part
of the input group signals, CBCOMP accepts health status information of each sensor, where logical
1 indicates a missing or faulty sensor. Any 'unhealthy' condition indication on an enabled sensor
input activates the LOSCOPSG output. Unacceptable numbers of faulty sensors, which do not meet
the criterion defined by the ErrInpOpt setting, activate the ALMSTS output. Furthermore, the sensor
failure information can be used for selecting a fallback strategy. This assumes that operating
conditions for three adjacent circuit breaker poles would generally be similar. The strategies also
depend on the ErrInpOpt setting for each measured parameter, see
Table 246: Processing of compensation values in dependence on sensor status
CompModeSel
setting
...1 Sensor
...3 Sensor
12.17

Multilevel threshold alarm generation MONALM

12.17.1

Identification

Function description
Multilevel threshold alarm
generation
12.17.2

Functionality

MONALM is used to monitor up to 9 groups of measured or calculated analog values, to ascertain
whether they are within a defined "normal" range as per the process requirements. The function
compares each input value against 1...4 threshold levels and indicates the range in which it is
currently residing. Values outside the normal range are indicated by a warning or alarm.
The numerical range information can be decoded into binary status signals by other functions such
as MVEXP, for example, to control a LED or binary output or to generate an event.
Furthermore, MONALM monitors one group of binary inputs, which represent alarm levels, and
replicates the input values to corresponding output signals. These signals are also used to indicate
the operational capability of the circuit breaker.
Technical Manual
ErrInpOpt Number of
setting faulty
sensors
(Any) 0
1
(Any) 0
All healthy 1, 2 or 3
Only one faulty 1
2 or 3
Atleast one 1
healthy
2
3
IEC 61850 identification
MONALM
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Table
Compensation Compensation value
value processed processed in phases
in phases with with faulty sensor
healthy sensor
Input value -
0.0 0.0
Input value -
0.0 0.0
Input value Average of input
values in phases with
healthy sensor
0.0 0.0
Input value Average of input
values in phases with
healthy sensor
Input value Input value in phase
with healthy sensor
0.0 0.0
IEC 60617 identification
-
Section 12
Monitoring
GUID-C6447FBC-1F8E-4785-9F0B-D409BEAE0B5C v1
246.
ALMSTS bit for
the channel
0
1
0
1
0
1
0
0
1
GUID-768D13F2-096F-4D18-8612-0737444B992C v1
GUID-D00D44D6-B7FE-4980-BDE9-63B08047DE28 v1
ANSI/IEEE C37.2 device
number
-
GUID-92C746A1-FFCA-42A5-BB58-7F00D25D57C5 v2
245