www.elvac.eu
RTU applications
protection & communication
Marian Kuruc
Ostrava 2015
Energetics
RTU protections
RTU
RTUs for control, protection, data acquisition and communication
Content
Overhead lines
Reclosers
Sectionalizers
Cable lines
Fault currents indicator
Substations
Telemetry
Protection functions
Functional interlocks
Automatic standby operation (MV, LV)
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RTU
RTUs for control, protection, data acquisition and communication
Overhead lines - reclosers
Circuit breaker equipped with a mechanism that can automatically close the breaker
after it has been opened due to a fault.
Protections used:
Earth fault (Wisher, conductance, wattmetric, connection of the neutral resistor)
Overcurrent
Short circuit
Recloser GVR Whipp & Bourne
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Recloser Tavrida - Nižné Ružbachy (SK) - 300/220
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RTU
RTUs for control, protection, data acquisition and communication
Overhead lines - sectionalizers
Sectionalizer is not rated to interrupt fault current
Each sectionalizer detects and counts fault current interruptions by the recloser. After
a pre-determined number of interruptions, the sectionalizer will open, thereby isolating
the faulty section of the circuit, allowing the recloser to restore supply to the other
non-fault sections.
Protections used:
Earth fault
Overcurrent
Short circuit
Sectionalizer - Hať (CZ)
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RTU
RTUs for control, protection, data acquisition and communication
Example – earth fault simulation
Configuration
RTU7M with EP card - RTU7M EP-3UA/2.5/3-1U/100/120-4I/1A/30A-I
EPG7 (7V AC / 45 mA AC) + HP amplifier (up to 20 A / 300 V AC)
Testing of RTU in lab by replaying of real fault record captured by another RTU
unit
Protections used:
Conductance, wattmetric
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RTU
RTUs for control, protection, data acquisition and communication
Cable lines – fault currents indicators
Indicates the passage of fault current
Reduce service interruptions by identifying the section of cable that has failed
Protections used:
Earth fault
Overcurrent
Short circuit
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RTU
RTUs for control, protection, data acquisition and communication
Substations – telemetry
Controlling and data acquisition of:
Digital inputs
Digital outputs
Analog inputs
GPS time synchronization
Communication protocols with SCADA:
IEC 60870-5-101, IEC 60870-5-104
DNP3
HioCom2
Communication protocols with lower-level:
IEC 60870-5-103, IEC 60870-5-104
DNP3
Modbus RTU/TCP
HioCom2
Main and backup communication
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Substation in Sofia (BG) – centralized solution
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RTU
RTUs for control, protection, data acquisition and communication
Substations – protection relay
MV, LV substations in factories and electricity distribution companies
Connection to SCADA MKD
Protections used:
Earth fault
Overcurrent - time (in)dependent
Short circuit
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Own products
RTU
RTUs for control, protection, data acquisition and communication
Substations – functional interlocks
Helps an equipment operator avoid mistakes ("mistake-proofing„), prevent incorrect
operation by the user
Mechanical, electrical and programmed interlocks
Example:
Bay interlocks
Earthing switch closing: associated circuit breaker must be open
Load break switch closing: earthing switch must be open
Substation interlocks – across all bays
Reactive power compensation capacitors must be connected to the same
bus system (A or B) as a feeder
Bus coupler breaker must be kept close during bus transfer operation
Use of RTU expressions for interlocks
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RTU
RTUs for control, protection, data acquisition and communication
Substations – Automatic standby operation (MV, LV)
The goal is to provide the automatic transfer of power for its associated load group
from a normal power source to an alternate power source in the event the normal
source fails
Use of RTU expressions
References:
On Semiconductor, Rožnov pod Radhoštěm (CZ) - ongoing
Západoslovenská distribučná (SK)
Elektrárna Třebovice (CZ)
www.elvac.eu | www.rtu.cz
Own products
RTU
RTUs for control, protection, data acquisition and communication
Substations – Automatic standby operation (MV, LV)
The goal is to provide the automatic transfer of power for its associated load group
from a normal power source to an alternate power source in the event the normal
source fails
Use of RTU expressions
References:
On Semiconductor, Rožnov pod Radhoštěm (CZ) - ongoing
Západoslovenská distribučná (SK)
Elektrárna Třebovice (CZ)
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Own products
Energetics
RTU communication
RTU
RTUs for control, protection, data acquisition and communication
Content
Centralized solution
Decentralized solution:
Serial - RS-485, CIR
ETH
100BaseFX
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RTU
RTUs for control, protection, data acquisition and communication
Communication – centralized solution
One (or more) 19“ RTU units in one rack and
connected using RS-485 or ethernet
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Own products
RTU
RTUs for control, protection, data acquisition and communication
Communication – centralized solution
Pros:
One (or more) 19“ RTU unit with indirect cards DI, DO, AI
Easy integration of substation oriented interlocking functions.
Hundreds of signals/measurements
Cons:
Cabling
Only one signalling panel ESP7
Reference:
ČEZ Bulgaria – substations in Sofia, Telegyr system replacement
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Own products
RTU
RTUs for control, protection, data acquisition and communication
Communication – decentralized solution
RS-485 – small applications
Concentrator – main
SCADA
Concentrator – backup
RTU User Center
- remote parametrization
- fault records downloading
RTU User Center
- local parametrization
- fault records downloading
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RTU
RTUs for control, protection, data acquisition and communication
Communication – decentralized solution
CIR – optical redundant circle
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RTU
RTUs for control, protection, data acquisition and communication
Communication – decentralized solution
Pros:
Galvanically isolated redundant communication
Easy integration of bay oriented interlocking functions
Signalling panel ESP7 for each RTU unit
Tens of RTUs on one communication circle
Cons:
1 bay = 1 RTU
Reference:
ČEZ - Energetika Vítkovice – approx. 400 pcs RTU
DEZA – substations RVN0.2, RVN0.3, RVN0.0, RVS – approx. 80 pcs RTU
Energetika Třinec – approx. 80 pcs RTU
Elektrárna Třebovice – 20 pcs RTU
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Own products
RTU
RTUs for control, protection, data acquisition and communication
Communication – decentralized solution
100BaseFX
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Own products
RTU
RTUs for control, protection, data acquisition and communication
Communication – decentralized solution
Pros:
Standardized and galvanically isolated industrial communication – possibility to
connect 3rd party devices
Easy integration of bay oriented interlocking functions
Signalling panel ESP7 for each RTU unit
Tens of RTUs on one communication circle
Cons:
1 bay = 1x RTU + 1x 100BaseFX media converter
Reference:
Not installed yet
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Own products
RTU
RTUs for control, protection, data acquisition and communication
Communication – common features
Remote parametrization over GPRS/3G network
Fault records downloading
Definování hlavní a záložní trasy na vzdálenou SCADA
Possibility to add a local SCADA MKD
Time synchronization – GPS
Connection of existing devices – IEC103, IEC104, DNP3, Modbus atd.
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O Společnosti
Thank you for your attention
Hasičská 53,
700 30 Ostrava - Hrabůvka
Czech Republic
www.elvac.eu
Tel.: +420 597 407 100
E-mail: sales@elvac.eu
www.elvac.eu, www.rtu.cz
RTU
RTUs for control, protection, data acquisition and communication
ELVAC RTU configuration web
complete settings of RTU7C without SW RTU UC
now we are preparing for the next RTU
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