(Protection) 699 en-A

Transmission & Distribution

TH7mProtection

5 482 699 En 1

Presentation 2

Selection table 3

Protection functions 4

Metering 7

Control - Monitoring associated with the protection 7

Communication 8

Interfaces 8

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...........................................................................................................Protection ..............................................................................................................................4

Transformer bay ....................................................................................................................5Bus section bay - Bus coupler bay ........................................................................................6

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.............................................................................................................................Auxiliary power supply...........................................................................................................8Interface with the local and monitoring equipment ................................................................8Interface with substation remote control and monitoring equipment .....................................9Interface with the GIS............................................................................................................9Sensor selection....................................................................................................................9

Line bay.................................................................................................................................4

Contents

5 482 699 En2

Sepam 2000

The TH7m GIS substation protection units arelocated in the local control cubicle connecteddirectly to the GIS switchgear

They are designed for the different HV bays inHV/MV substations

Presentation

Advantages :

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A single range of products for consistentsubstation protection.

The network protection provided by the mainline protection unit can be adapted to thedistributor's protection plan

Digital technology offershigh-performance, sensitive and accurate

functions with a wide range of settingsadditional functions, continuous self-testing,

d i s t u r b a n c e r e c o r d i n g , p o s s i b i l i t y o fcommunication with the substation control andmonitoring system

The simple, dependable operation of the unitsis consistent with that of the Bay Controller.

Commissioning is fast since the overall solutionis tested and validated in the factory. On-sitetesting is limited to the commissioning of the mainline bay protection unit, which largely depends onthe network parameters

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The bay type “Line/transformer” (transformer connected to one line via only one circuit breaker) has the same protectionfunctions than the transformer bay

The line is supposed to be protected in the upstream substation and thus doesn't need to be downstream protected,

The breaker failure function is available for being used in the upstream substation.

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Selection table

Type of bay

distanceline differential

Functions

Main protection (to be chosen)

transformer differentialrestricted earth faultbusbar differential

recloser and synchro-checkthermal overloadbreaker failurephase overcurrentearth faultdirectional earth faultline undervoltage

current measurementvoltage measurement

Lockout relayinhibit closingadjacent breaker trippingopen/close controlwith downgraded operationannunciationfault trip countermonitoring

Complementary protection

Metering

Control and monitoring associatedwith protection units

Communication option

ANSIcode

2187L87T

64REF87B

79/2549

51BF50/51

50N/51N67N27

8669

30

SEL311C

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none none noneSepam D21/D31

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Sepam 100LDSepam W01/W02

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line

Sepam L65

transformer

Sepam T63

bus sectionor bus coupler

Sepam B61

(1) disabled when the recloser is in service

Solkor-M

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(1)

(1)

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Protection functions

Protection

Line bay

Each bay is generally protected by a mainprotection unit and a complementary protectionunit

functions associated with the main protectionunit: recloser, overload

main protection unit: sensitive, fast andselective. It is adapted to suit the equipmentassociated with the bay: line, transformer,busbars.

complementary protection unit combiningseveral functions

functions associated with the switchgear:breaker failure

main protection back-up functions: phaseovercurrent, earth fault

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The main protection unit is chosen according tothe type of connection

for overhead lines: SEL 311 distanceprotection

for HV cable : Solkor-M line differentialprotection.

A distinction is made between substationprotection and network protection

For other types of protection, please consult us

substation protection is oriented towards thesubstation equipment and switchgear. It is basedon the Sepam range

network protection is oriented towards thenetwork outside the substation, i .e. l ineprotection. The protection units proposed aresuited to regional distribution networks

Schweitzer REL311C distance protection, foroverhead lines

Reyrolle Solkor-M line differential protection,for cable connections

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The Sepam L65 complementary protection unitincludes the following functions

recloser initiated by the main protection unit,with synchronism checking

directional earth fault, which provides partialselective backup of the main protection unit andis, in some cases, the only selective protectionfunction when there is no distance or differentialprotection

undervoltage, which may be used for operatingsafety (e.g. detection of no voltage to enableclosing of the line earthing switch),

breaker failure: this function is initiated by allthe tripping orders given by the protection units(main and complementary)

phase o v e r c u r r e n t a n d e a r t h f au l t :instantaneous and time-delayed protectionfunctions which back up the main protection unit

Line bay protection schemewith distance protection with differential protection

SEL 311 C

SepamL65

déclt

déclt/réenclt

déclt disjadjacents

diff. barreszones 1 et 2

diff. barreszone de validation



Solkor-M

SepamL65

déclt


déclt/réenclt

busbar diff.Check zone


trippingtripping

tripping/reclosingtripping/reclosing

adjacentbreakerstripping

adjacentbreakerstripping

busbar diff.Zones 1 and 2


Sepam L65 Sepam L65

55 482 699 En

Transformerbay

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The main transformer protection againstinternal faults is transformer differentialprotection, which may be completed by restrictedearth fault protection

Sepam D21 is the model suited to transformerswith 2 windings

Sepam D31 is the model suited to transformerswith 3 windings

The Sepam T63 complementary protection unitincludes the following functions

overload: this function, based on a thermalimage, determines load-related overheating

processing of faults detected by the devicesintegrated in the transformer (buchholz,thermostat, tap changer failure) to trip in the eventof an internal fault



Transformer bay protection scheme

Sepam D21

Sepam T63

déclt




tripping



adjacentbreakertripping

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Bus section bayBus coupler bay

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Sepam W01/W02.

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The main protection is busbar protection. It isbased on high impedance differential protectioncombined with current sensor monitoringFor each busbar zone the main protectionincludes the following

Sepam 100LD for high impedance differentialprotection of zone

for current sensor circuitmonitoring, zone management and annunciation

In the case of a single busbar schema thecurrents circuit is simplified due to:- The protection relays are installed on the LCC.- Selector auxiliary contacts are not necessary.Consequently the check zone protection is notcompulsary.

Check zoneIn a double busbar station, current circuits fromcurrent sensors are switched to either of the zoneprotections by auxiliary contacts according to theposition of the selector switch disconnectorsThe circuit complexity due to these switches andthe consequences of an unwanted trippingnecessitate to validate the fault detection by aglobal protection that monitors all station zones(check zone). This protection is realized withoutauxiliary contacts: it is thus simple and reliable

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The Sepam B61 complementary protection unitincludes the following functions



Bus section bay protection scheme

Bus coupler bay protection scheme

Scheme of current switch by double busbarbay (line bay or transformer bay)

5 482 699 En

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vers protection zone2vers protection zone1

vers protection zonevalidation

To check zone protection

To zone 2 protectionTo zone 1 protection

TC zone ATC zone B

SepamB61

Sepam100LD

Sepam100LD

SepamW02

déclt zone A

déclt zone B

différentielle de barres


zone A zone B

TC zone 1TC zone2

SepamB61

Sepam100LD

Sepam100LD

SepamW02

déclt zone 1

déclt zone 2

différentielle de barres


zone 1zone 2

Sepam100LDSepamW01

zone de validation

TC zone de validation

Sepam 100LDSepam 100LD

Sepam B61

Sepam W02

Sepam W01

Sepam 100LDSepam 100LD

Sepam W02

Sepam B61

Sepam 100LD

Check zone

Check zone CT

busbar differential

busbar differential

zone 2 tripping

zone 1 tripping

zone 2 CT zone 1 CT

adjacent breakertripping

zone B tripping

zone A tripping

zone B CT zone A CT

adjacent breakertripping

75 482 699 En

Metering

Control - Monitoring associated with the protection

Metering functionsphase currentdifferential currentvoltagepower, energy,power factorfrequencytripping currentsresidual currentresidual voltagedisturbance recordingcumulative breaking currentand number of breaks

(I1, I2, I3)

(1)

Protection device

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SEL311C Solkor-MSepam

D21/D31Sepam

W01/W02Sepam

L65Sepam

T63Sepam

B61

(1)

.the disturbance recording function is used to record electrical signals and logical data prior to and

after a protection tripping order or manual recording order

The control and monitoring functions allow theprotection units to directly control tripping andclosing operations independently with respect tothe operating functions, indicate protection unitaction and monitor protection unit operation.

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latching/acknowledgment, inhibit closing: toavoid feeding faults by taking into account theoperation of the protection unit. These functionsare disabled for line bay protection unitsconnected to a recloser in service

adjacent breakers tripping to open the circuit inthe following cases

if the breaker failure function has detected thata tripping order given by a protection unit has notopened the circuit breaker

if a protection tripping order appears whencircuit breaker opening is inhibited

The protection units also have several measuringfunctions which can be adapted to the followingrequirements

commissioning, especially for the tests used tocheck the connections and settings

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analysis following an incident, in particular todetermine the reasons for tripping

maintenance, in particular by providing thenumber of circuit breaker trips

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open/close control during downgradedoperation: for voluntary operation of the circuitbreaker in local or remote mode when the normalbay operating system is not working

annunciation: to identify the type of fault thathas triggered the protection unit and indicate anabnormal situation. These data may be accessedon the display, via contacts and via the optionalcommunication link

fault trip counter: for assistance with theoperation and management of the network andequipment

supervision: self-testing and auxiliary powersupply monitoring

Interfaces

8 5 482 699 En

Communication

The communication option can be used for dataexchanges with the substation remote control andmonitoring system, via a communication channel:Jbus/Modbus, master-slave protocol with anRS485 type physical link in 2-wire mode (300 to38400 bauds).

The following types of data may be exchanged:

The connectors and links between the devices inthe local control cubicle are included with thecommunication option.

remote indications,remote control orders,emote settingsime-stamped events

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The main and complementary protection units aresuppl ied by auxi l iary vol tages that areindependent, i.e. protected and distributedseparately:

the complementary protection unit and the firsttripping coil are supplied by auxiliary voltage T1,

the main protection unit and the second trippingcoil are supplied by auxiliary voltage T2.

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Auxiliary powersupply

The protection data required for the operation andsupervision of the bay are transmitted to the BayController by individual wiring.

for recloser in line bay

control and monitoring data required by theprotections

CB in open positionCB in close positioninhibit trippingdowngraded operation authorisationVT circuit availabletripping informationclosing informationright closing conditions

protection data required by control andmonitoring

tripping orderclosing orderclosing inhibited

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(1)

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Necessary data for operation coming fromthe line protection are transmitted to the BayController in order to get the benefit of thecommunication option

distance protectiontripping by protection units and inhibition of

closingline fault trippingdefinitive trippingclosing on faultdirectional earth faultVT supervision,relay inoperative (watchdog)

line differential protectionline fault trippingdifferential connection faultintertripping from the other endrelay inoperative (watchdog)

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Interface withthe localcontrol andmonitoringequipment

-Q01

protectionprincipale

protectioncomplémentaire

baycontroller

enclt

T2T1

déclt 1 déclt 2

mainprotection

closing tripping 1 tripping 2

complementaryprotection

9

CT specification complies with chosen protectionsuppliers recommendations, with IEC 60044-1standard in a general way and with its amendment1 for line protection, in particular to take intoaccount the influence of residual flux in reclosing.

Interfaces

5 482 699 En

Interface withsubstationremote controland monitoringequipment

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remote indicationsprotection unit operation (directly or via the

Bay Controller)recloser status

remote control ordersopening/closing with downgraded operationchoice of reclosing mode

Interface withthe GIS

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circuit breaker:

the characteristics of the protection deviceoutputs allow direct control of the coils (nointermediary relays are required

circuit breaker closed indicationoperating mechanism charged indicationopen/close control

current sensor comprising different cores forthe following applications

main protectioncomplementary protection and operating

measurementsbusbar differential protection,

voltage sensor comprising 2 secondary circuitsfor the following applications

distance protectiondirectional earth fault protection, undervoltage,

s y n c h r o n i s m c h e c k i n g , and o p e r a t i n gmeasurements

check zone differential protection for doublebusbar bays.

The s igna ls t ransmi t ted by the currenttransformers and voltage transformers areconnected to the protection units via test terminalboxes.

Sensor selection The sensors included in the GIS are sized forprotection unit operation.

The characteristics are appropriate for theintended operating conditions: maximum short-circuit current, protection units installed in thelocal control cubicles (except for transformerdifferential protection which may be installed inthe equipment situated downstream from thetransformer, at a maximum distance of 100meters).

5 482 699 En - A 10/2001

VA TECH Transmission & Distribution GmbH & Co KEGPenzinger StraBe 76, A-1141 ViennaTel.: ++43/1/89 100, Fax: ++43/1/89 100-196E-mail: [email protected], www.vatech-td.com

Product managementVA TECH Schneider High Voltagec/o Schneider Electric High VoltageBP 178 - 1 rue de la Néva - 38004 Grenoble Cedex 1Tel.: ++33(0)4 76 57 90 64, Fax: ++33(0)4 76 57 39 20

Due to the evolution in standards and in material, the information contained in the text and illustrations arenot guarantedand require confirmation from the relevant department.Publishing: VA TECH Schneider Electric High Voltage ; Design and production: Salque

(Protection) 699 en-A

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Transcript of (Protection) 699 en-A