Table-8
Relay Configurations
A relay can be configured in one of the four modes given below.
High alarm relay means that it will go to alarm condition
when the measured parameter is greater than the set
limit and low alarm relay means it will go to alarm mode
when measure parameter is less than the set limit.
Energized relay means that the relay switch will be
closed in alarm condition and de-energized relay
means that the switch will be open in alarm condition.
Trip Point
This parameter decides the limit for a particular
measurement parameter, crossing which the relay
goes into alarm mode. These values are defined in
percentage of nominal value(except for energy and
ampere hour parameters).
For high alarm configuration, the ranges are 10-120%.
For low alarm, configuration, the ranges are 10-100%.
For energy and ampere hour parameters the ranges
are 10-9999999.
Example:
If nominal voltage value is 48V and trip point
is 60%, the absolute value of trip point will be
28.8V(60% of 48).
Hysteresis
Hyteresis is the offset value below high alarm trip point
or above low alarm trip point, which when crossed by
the measured parameter, resets the relay to its position
before tripping i.e. normal condition.
The value of hysteresis can range from 0.5 to 50% and
it gets calculated on trip point value.
Example:
If trip point is 60% and hysteresis is 25%,
then hysteresis value will be equal to 15%(25% of 60).
To get absolute value of hysteresis subtract this much
part of nominal value from the trip point in case of high
alarm or add this to the trip point value in case of low
alarm.
Limit relay can be used to monitor the measured parameter in
comparison to a set limit.
8.1 Limit Relay
8. Relay Output
Note : -
1. Nominal power = Nom V x Nom I
2. Range in % of nominal value
1) Hi-E High alarm, energized relay
2) Hi-d High alarm, de-energized relay
3) Lo-E Low alarm, energized relay
4) Lo-d Low alarm, de-energized relay
Para No.
Parameter
Range
0
None
-------
1
Voltage
±10 - ±120%
2
Current
±10 - ±120%
3
Power
±10 - ±120%
4
Import Power Demand
10 - 120%
5
Export Power Demand
10 - 120%
6
Import Current Demand
10 - 120%
7
Export Current Demand
10 - 120%
8
Max Import Power Demand
10 - 120%
9
Max Export Power Demand
10 - 120%
10
Max Import Current Demand
10 - 120%
11
Max Export Current Demand
10 - 120%
12
Import Ampere Hour
10 - 9999999
13
Export Ampere Hour
10 - 9999999
14
Import Energy
10 - 9999999
15
Export Energy
10 - 9999999
38
