N U M E R I C A L O C / E F P R O T E C T I O N R E L AY AD R 1 4 1 C / 2 4 1 C
ASHIDA Electronics Pvt. Ltd.
Ref: Manual / ADR141C / 241C
Issue: 04D
Date : 10.07.2014
Page
6/86
1. Description:
•
ADR141C / ADR241C are second generation Numerical 3OC + 1EF Over Current
Relay
.
[The ADR241C is communicable Relay having RS485 Port. All the other
features as per ADR141C Relay]
It consist all the necessary protection and monitoring
functions required for Normal feeder. It consists of High Speed Digital DSP Controller.
•
Analog Measuring Module.
•
Power supply Module.
•
Digital Input output module.
The High speed Digital Signal Controller continuously monitors phase, E/F current along with
different optical isolated status connections. The high-speed micro-controller samples these
current signals through a
A/D converter
. The Digital Signal performs powerful
Numerical
Algorithms
to find out RMS of fundamental & harmonic contents of the current then this
value is used for protection and metering function. All measurement is tuned to fundamental
frequency i.e. 50Hz, thus relay remain stable during distorted waveform generated
electronics loco-motive. All these measure values are then used for different protection
function such as IDMT/DMT Over current protection, Instantaneous Over current protection,
Earth Fault protection, etc. These measured values are also displayed on large 16 x 2 LCD
display for metering purpose. The
DSC
also monitors different digital input through optical
isolator and perform some monitoring function such trip circuit supervision, and control
potential free contact for control CB and generate ALARM and Tele-signalling.
The power supply module is basically DC – DC converted designed using modern PWM
based Switching mode technique to convert station battery supply to the 12V and 24Vdc low
voltage supply for relay electronics and control circuit. It also provides necessary isolation
from station battery. The power supply module is design using very advance PWM controller
which allow very wide input supply variation i.e 18V to 250VAC/DC covering 24Vdc, 30Vdc,
and 110Vdc and 220Vdc station battery requirement.
The relay is having total 4 nos of high intensity dual LED for easy identification of type of fault
for easy user interface. All LEDs and control output RL2 to RL4 are fully programmable via
keypad interface
