rte dufour protection systemforactives substation
TRANSCRIPT
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DEFINITION OF A PROTECTION SYSTEM FOR THE ACTIVES SUBSTATIONS IN
RADIAL NETWORK
Jonathan DUFOUR EMTP-RV User group Meeting
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Summary
■ Issue
■ Presentation of the test network
■ The EMTP diagram
■ Presentation of the parametric study and its use
■ Some results
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Definitions
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■
■
Interconnected networkBranchRadial Network
Pitting substation
Interconnected network
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Issue
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Loads
RTE CustomerGeneration
Backup circuit breaker
Loads
RTE CustomerGeneration
Backup circuit breaker
■ Before, many distribution network were only consumers
■ Now, some substation become active We have to protect the network The protection of the customer
(distribution) can fail RTE has decided to install a
backup circuit breaker
■ We have to define a protection system for this new circuit breaker Simple and not expensive
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The test network
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Substation A
Substation C
Substation Bgrid
■ Only the radial network will be simulated■ Three substations are represented■ Faults will be applied on AB and AC lines■ The loads on the network are neglected ■ Protections and circuits breaker of substations A and C are supposed
to be faster than the backup protection in substation B.
Generationon the distribution
network
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The EMTP diagram
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Substation A
Substation C
Substation Bgrid
Generationon the distribution
network
Measurements Fault
Substation BGenerations
AB line Substation A
AC line
Substation C
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Presentation of the parametric study and its use
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■ With this study we have a large number of parameters Two voltage levels : 63 kV and 90 kV Various connection of transformer : star or delta Two kind of earth connection : floating or directly grounded More than 4 type of faults : single phase, two-phase (to ground or not),
three-phase Circuit breaker of substation A open or closed Multiple positions of fault on each line
■ All theses cases have to be simulated It’s time consuming…
■ The solution is using an automated parametric study approach
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Presentation of the parametric study and its use
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■ Principle Automated calculation
■ In this study, we vary the position of the fault One simulation = 10 positions of fault
■ All the results are summarized in an excel spreadsheet■ It’s an important saving of time
■ In the EMTP diagram
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Presentation of the parametric study and its use
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■ Script developed by S. DENNETIERE of EDF R&D
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Some results
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■ Three phase fault
Phase-to-phase voltage
0%
5%
10%
15%
20%
25%
0% 20% 40% 60% 80% 100% 120%
Fault position
in p
erce
nt o
f nom
inal
vol
tage
Uab %Uac %Ubc %
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Some results
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■ After the study : Detection insured ?
?Phase-to-phase protectionHigh generation on the substation> 20 MW
Phase-to-phase and a zero sequence protectionsPhase-to-phase protectionLow generation on the substation
< 20 MW
Single phase faultPolyphase faults
■ Problem with single phase faults because it depends on the grounding of the network
■ We have to use an other protection This protection has to run with all the power generation (0 MW to 50 MW)
• No distance protection and differential protection For example a weak infeed protection
■ The protection system is not defined yet at this day
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Conclusion
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■ In this study all types of fault were simulated Others software didn’t make success
■ It’s an easy study in EMTP but important for the network life
■ Use of a script in EMTP to save time It would be interesting to develop a function in the software to make it
approachable easily for all the users of EMTP
■ This study was the first on passive branch which become active More and more substations become actives
■ The next study will used wind farm models in EMTP RTE have some models
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■ Thank you for your attention
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DEFINITION OF A PROTECTION SYSTEM FOR THE ACTIVES SUBSTATIONS IN
RADIAL NETWORK