NR Electric PCS-9611, Instruction Manual

Page: 109 / 300

4 Supervision
PCS-9611 Feeder Relay
4-1
Date: 2014-04-08
4.1 Overview
Though the protection system is in non-operating state under normal conditions, it is waiting for a
power system fault to occur at any time and must operate for the fault without fail.
When the equipment is in energizing process before the LED “
HEALTHY
” is on, the equipment
needs to be checked to ensure there are no errors. Therefore, the automatic supervision function,
which checks the health of the protection system during startup and normal operation procedure,
plays an important role.
The numerical relay based on the microprocessor operations has the capability for implementing
this automatic supervision function of the protection system.
In case a fatal fault is detected during automatic supervision, the equipment will be blocked out. It
means that this relay is out of service. Therefore you must re-energize the relay or even replace a
module to make this relay back into service.
4.2 Supervision Functions
4.2.1 Device Hardware Supervision
The MCU, RAM, ROM chips in this relay are monitored continuously to ensure whether they are
damaged or have some errors.
If any one of them is detected damaged or having error, this relay will be blocked, the alarm signal
[Fail_Device] will be issued, and t
he LED indicator “
HEALTHY
” will be off at the same time.
4.2.2 Board Configuration Error Supervision
If the board configuration of this relay does not comply with the program software of this relay, the
alarm signals [Fail_Device] and [Fail_BoardConfig] will be issued, and the LED indicator
“
HEALTHY
” will be off at the same time.
4.2.3 Setting Supervision
This relay has 10 setting groups, but only one is active at any time. The settings of active setting
group are checked continuously.
If anyone of the active settings is confirmed to be modified, this relay will be blocked, the alarm
signals [Fail_Device] and [Fail_Setting] will be issued; meanwhile, if the modified setting is out of
the appointed range, the alarm signal [Fail_Setting_OvRange] will be issued at the same time.
T
he LED indicator “
HEALTHY
” will be off at the same time.
If anyone of the items of the setting file is changed (the program of this relay is updated), the
alarm signal [Fail_SettingItem_Chgd] will be issued. T
he LED indicator “
HEALTHY
” will be off at
the same time.
If the settings which are from the HMI module to the main CPU module are not in accordance with