Indications; Functionality; Function Block; Signals - Hitachi Relion 650 Series Technical Manual

1MRK 511 557-UEN Rev. A
12.5

Indications

12.5.1

Functionality

To get fast, condensed and reliable information about disturbances in the primary and/or in the
secondary system it is important to know, for example binary signals that have changed status during
a disturbance. This information is used in the short perspective to get information via the local HMI in
a straightforward way.
There are three LEDs on the local HMI (green, yellow and red), which will display status information
about the IED and the Disturbance recorder function (triggered).
The Indication list function shows all selected binary input signals connected to the Disturbance
recorder function that have changed status during a disturbance.
12.5.2

Function block

The Indications function has no function block of its own.
12.5.3

Signals

12.5.3.1

Input signals

The Indications function logs the same binary input signals as the Disturbance report function.
12.5.4

Operation principle

The LED indications display this information:
Green LED:
Steady light
Flashing light
Dark
Yellow LED:
Function controlled by SetLEDn setting in Disturbance report function.
Red LED:
Function controlled by SetLEDn setting in Disturbance report function.
Indication list:
The possible indication signals are the same as the ones chosen for the disturbance report function
and disturbance recorder.
The indication function tracks 0 to 1 changes of binary signals during the recording period of the
collection window. This means that constant logic zero, constant logic one or state changes from
logic one to logic zero will not be visible in the list of indications. Signals are not time tagged. In order
to be recorded in the list of indications:
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Section 12
Monitoring
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