RED 670 FAIL

There are two 380 KV  line in the substation and both are continuously charged for three months with 70% load in summer. The load was reduced in winter and one line got shutdown. The differential relay RED 670 which is belong to shutdown get started to restart again and again and finally its comes a stage as below

NORMAL RELAY MAIN MENU 

DEFECTIVE  RELAY MAIN MENU 

 

1. There is no Measurement column and instant of 'RED670' , ' IED 6x0.1.0  in the top line
2. There is no previous disturbance records and Events
3. There is no inbuilt serial numbers and type
4. Ready LED glows





1. All final relay settings are corrupted there is no more data

ABB suggested the following

1. DC switch ON/OFF

But nothing will happened same status

2. Up load final relay setting files again
Already rear side fiber communication with SAS failed and laptop connected in front port and relay was communicated. But setting file can't write and read from relay.

Finally ABB come to site and find out the problem. The Central processing unit ( CPU ) cord  got failure and changed new one. Setting files are uploaded and tested. Now relay works fine.

SUBSTATION COMMUNICATION SYSTEM BASIC

The communication between station to station established by a separate communication system.

OPTICAL GROUND WIRE ( OPGW )

An OPGW cable contains a tubular structure with one or more optical fiber in it, surrounded by layers of steel and and aluminium wires. The OPGW cable is run between the tops of high-voltage Towers. The conductive part of the cable serves to bond adjacent towers to earth ground, and shields the high voltage conductors from lightning strikes. The optical fibers within the cable can be used for high-speed transmission of data for protection and control and utility's own voice and data communication.

U/G NMFOC

OPGW cable will bring to bottom of the tower and spliced with Single mode Under Ground Non Metallic Fiber Optic cable in a junction box. NMFOC cable made connection between OPGW and OFMR , ( in side substation communication room ) laying through the under ground communication duct bank.
Its may be 48 core, 24 core 12 core depend upon requirement.

OPTICAL FIBER MANAGEMENT RACK  (OFMR )

OFMR is a junction box to connect the NMFOC to other communication equipment. OFMR mounted in the Fiber Splicing / Termination Panel (FSTP). OFMR suitable for terminate 48 ,24 ,12 core  U/G NMFOC. Small length Pigtail fiber cable is used to connect the NMFOC and OFMR.

OFMR - MFDC

PATCH CABLE SPECIFICATION  FC/ PC Type connector in one end (ITU-T-G655)

PIGTAIL CABLE SPECIFICATION FC/PC Type connector in one end ( ITU-T- G655)

FSTP

SYNCHRONOUS DIGITAL HIERARCHY ( SDH )

SDH is the total communication unit used to convert and invert the electrical signal  and voice signals to digital signal. SDH is a unit of equipments contain Converts and Digital Cross connection Panel ( DCX ), Data Voice Multiplexer ( DVM ). DVM panels are contain number of channels with FOX 515. Each chenals are specified for each purposes Protection , SCADA , Voice communication. FOX 515 connected with MDF ( Main Distribution Frame ) by useing 100 pair cable.

COMMUNICATION RACK






JUNCTION CONNECTION 




DXC & DVM PANELS

MAIN DISTRIBUTION FRAME ( MDF)

MDF is a signal disribution rack to connect the electrical signal wires from Protection panels and SCADA , Telephone panels.