Todays complex grid network needs to deliver power over long distances. This necessitates more control, monitoring through extensive SCADA systems and an array of IEDs through the network. Time Synchronisation of such a complex network is mandatory & achieveing gauranteed uniform time across this network is key challenge for any Grid today. Sertel’s expertise and solutions understand this complexity fully & strive towards achieveing this Time Commodity using our innovative reliable solutions with highest quality in such a complex network.
Challenges & Solutions
Challenge: GNSS RECEPTION – LONG DISTANCE TUNNELS, HYDRO PLANTS, MINES & REFINERIES
Often cable length limit for GPS Receivers to GPS Antenna in environments like Hydro Plants, SCADA Control room in Tunnels, Mines are crucial due to longer length requirements.
L1/L2 frequency band in range of 1.5 Ghz is subject to attenuation factor for transmission of very high RF over longer distance of cable. Sertel’s Solution of GNSS Frequency Down Conversion helps address this installation issue and provide a very precise Antenna , Amplifier & Surge Suppression Solution for Distances upto 300-800 meters.
SOLUTION: SERTEL GNSS DOWN CONVERTER RECEPTION TECHNIQUE
Sertel Receivers uses GNSS Frequency Down Converter technique for transmission of RF signal for long distance even above 400 Mtrs.
SCADA in Atal Tunnel Project which is around 350 mtrs distance from Line of sight to control room is successfully synchronized with help of GNSS Frequency Down Converter Technique
Sertel’s unique design can take signals up to maximum of 800 meters between Active Antenna & Reception Point.
CHALLENGE: SUBSTATION AUTOMATION – INTEROPERABILITY WITH OEM IEDs
Line differential relay integrates main and back-up protection functions, which is designed for overhead line, cables and hybrid transmission lines of various voltage levels and provides comprehensive protection and control solutions. Sertel’s time solutions for line differential enhances key monitoring and Control for protection, control solutions for Generation, GRP, Transmission & Distribution.
SOLUTION: SAS AUTOMATION INTEROPERABILITY, INTEGRATION, HANDSHAKING WITH IEDs – MICOM,MULTILIN,NARI RCS PCS, SIPROTEC,REL SERIES,HUSKY AND OTHER OEM
Synchronising solutions to various Line Differential & Protection IEDs compatible via following protocols for different OEM products.
IRIG-B: Differential, TTL level or BNC
PPS: Pulse per second (PPS) via RS-485 differential level, binary input or BNC
IEEE 1588: Clock message based on IEEE 1588 via Ethernet network
SNTP: Unicast (point-to-point) & Broadcast SNTP mode via Ethernet network
Clock messages: IEC 60870-5-103 protocol, Modbus protocol and DNP3.0 protocol
CHALLENGE: SEQUENCE OF EVENT RECORDING – ACCURACY
Detection of more time deviation across the substations, incoming and outgoing feeders. Impossible for an operator to detect the first event occurrence time during grid blackout.
Non uniformity in time stamping throughout the entire substation across plant area, even though GPS Time Sync is provided to required devices
Time difference in various critical devices SCADA, IEDs, Disturbance recorders, SOE within and across stations even critical devices are time stamped
Problem of time discrepancy is observed amongst the various GPS systems present leading to mismatch, errors in data analysis & post mortem failure analysis from various disturbance recorders, log data’s.
SOLUTION: TAMING THE TIME INACCURACY IN REAL TIME AUTOMATION NETWORK- SERTEL TMS SOLUTIONS
Time Monitoring Device will collect the time discrepancy emanating from the various IEDs, SCADA, GPS systems at the port of synchronisation and relaying them to central monitoring station / central control room to understand the differences. The time deviations monitored at various GPS systems from different sites can be collected to one central location in real time basis. This data can be monitored to take well informed decisions.
reference time source and compare input time packet [IRIG-B] generated from existing GPS system. The difference in the time accuracy will be measured periodically and communicated to the central location
Time Monitoring device will able to analyze on the time difference at Substation level, Bay level, IED level and at distribution level
CHALLENGE: DATA ACQUISTION – PHASOR SAMPLING -SYNCHROPHASOR – PRECISE TIMING
In a process if blackout/failures/event occurs very rapidly throughout the process/network chain.
SOE Cards, Protection IEDs are distributed among multiple controllers by capturing the Sequential of Events and displaying in the Process History Chart/Trend. Several SOE cards are placed.
Real challenge is to make sense of the collected data observing them over a common time domain for data analysis. Most often capturing them over a common domain never happens due to separate or segregated Time sync adaptions over different packages.
SOLUTION: SERTEL HIGH PRECISION CLOCKS & DATA CONCENTRATORS – WITH ACCURATE REMOTE MONITORING
Sertel system will synchronize the SOE cards with high time resolution by means of recording the time stamp events over PTP, NTP, IRIG-B, RS485 Differential Pulse profiles in the order of milli-second level. This will capture the process upset events time stamp close to the source of event.
Combined with our innovative monitoring solutions, Sertel’s Solution helps identify time at various IEDs and point out failure of synchronisation at different packages.
This allows the operator to determine accurate picture & precise order in which sequence of events occurred.
CHALLENGE: Implementation of C37.118 Power Profile & IEC61850-9-3 profiles for PTP IEEE1588V2 CLOCKS for SAS Substations.
Power Grid Asset revamping or upgradation to equipment’s such as protection relays, Bay Controllers, Line Differential Relays etc., might require latest Timing Signal IEEE1588v2 (PTPv2) in different profiles depending on the origin of relay manufacturer. Sertel’s Solution can help upgrade to this from its existing system/panel by implementing Signal Conditioners, Protocol converters. These are designed to meet the current standards and provide utmost synchronization accuracy in the Grid.
SOLUTION: SERTEL GRANDMASTER PTP CLOCKS & SYNCE SERVERS
T-GPS-300 family GNSS Master Clock currently include PTPv2 implementation in various Profiles to comply with different relay makes such as Multiline, SIPROTEC, RAL Series, etc. Our T-SC-300 family conditioners can be used to extend the signals from existing receivers and add on the PTP Grand Master feature for achieving this for a Modern day Power Grid Implementation at various Station Bus and Process Bus levels. These can be verified with conventional Time Analyzer such T-FSDA-300 for verification purposes.
1. This is GPS GrandMaster with PTP, PRP compliance
2. Signal Conditioner which can take in legacy input and provide PTPGM Output.
3. IRIGB Translator generate IRIGB , other legacy outputs from PTPv2 acts as PTP Slave.