Selection Guides'., ~-""--,~,~,,

1 MDBO1 002-ENPage 1March 1 992Changed since August 1990Dala subjecl lo change wilhoul nolice

ABB Network Controi& Protection

Introduction

0,0 :~.~~~. ~~~

~cC",=,,-,,"cce

This selection guide is intended to give a guideto which relays of the ABB range can be usedfor the protection of different types of objects.

For most applications products from differentmechanical design and mounting systems areavailable. The main ranges are:

COMBIFLEX range based on plug-in mod-ules for mounting in 19" racks or cages. Morecomprehensive units comprise a rack andplug-in types of circuit boards. The connec-tions are made with COMBIFLEX connection

equipment.

MODURES range based on plug-in modulesfor mounting in 19" racks or cages. Interna!connections are made with wire-wrap and ex-ternal connections with terminals pre-wired

upon delivery.

ABB can supply individual protection and auxil-iary relays to enable the user to design protec-tion panels, or system solutions with equip-ment in panels, including system design,mounting and panel testing.

The appricatian nates for different objects areintended to give a briefing of problems with

protection appfication.

Further information is available in ApplicationGuides and other specific documents describ-

ing appticafron problems.SPACOM range based on p/ug-in modufes in3U high cases of size 100/S, 100, 300/S or300 or in a 3U 19" rack. The external connec-tions are made with screw connections. SPA-range is used for products in distribution

range.

The setection guide for different objects givesa summary 01 availabie products from differentranges. The catalogue section gives refer-ences to suitable products described underother sections than the object section.

Busbarprotection

Application notesA number of busbar protection relays are avail- -Different CT ratios, CT RADSSable from ABB Relays. The relays are from cores used also for other INX5the COMBIFLEX and MODURES range where relays, single and multi busthe mounting system flexibility makes them coofigurations. Breaker failuresuitable to used eftf1er as stand~alone units or protection can be included.as a system solution. The latter includes -Different CT ratios, CTequipment in relay panels as weil as system cores used also for otherde~sign and testing. For the individual pr?tec- relays. Microprocessor basedtion rela~s, c~rcuit diagrams a.nd/or termmal or. logic with supervision, single andconnection diagrams are avallable. REB 100 IS multi bus configuration. Breakerpart of the PYRAMID concept. failure protection can be included.

When de~iding ~po.n a specific choi.ce ?f relay, r Ithe followrng guIdelInes for the appllcatlon I Icould be used: .J

-CT's of same ratios, 1- -dedicated CT cores

REa 103

Bus configuratk>n

h ',h ('"1 ('"1!

~~ ~~ ~~ ~~

RADHASU9ta l

RADSSwith sum-mation transf.REB 101

I Selection table

Symbol Description i COMBIFLEX MODURES

-Single-zone protectionSimplified version

.~.~~~.-

900-series includes a number of analog andnumerical draw"-Qut products, mounted in asize 1 or size 2 case, thus also allowing it tobe exchanged with existing electromechanicalrange in the same case. The external connec-tions are with screw connections. The connec-tion of new products are pin-compatible withthe old electromechanical product.

ABB Network Contro!& Protection

Selection Guides

IA3VO8 1o1WOA8 A3eA

Transmission line Application natesprc,tection The protection system for transmission lines is for the specific application. Unique with

dependent on several factors, such as: PYRAMID isthat the range offers many alter-n~tivA~ with rliff"r"nt "n~t/p"rfnrmQn"" r~tin~

.Type of network earthing.Authority requirement on The different PYRAMID relays can be

-speed of fault clearing equipped with the optional functions indicated-sensitivity in Table 2.

-dependability.System requirement on Based on the PYRAMID range of relays. line

,- speed of fault clearing protection terminals, according to Table 5, can-selectivity be ordered. These line terminals are complete-dependability line protection units with measuring relays and-security additional functions, such as trip relays. auto-

.Existing protection in the network reclosur~ etc: In cas~ of redundant protectio~

.Specific requirements due to series- one terml~alls used In each subsystem (mal ncompensation and HVDC 1 and maln 2).

.Requirement of additional functions, such Th t bl h f. t , f . t. e a e s ows con Igura lon o exls Ing

:s~ It I f PYRAMID line terminals with series communi-au oca lon. cation and self-supervision. REL 100 -

-event and fault r~co~dlng. REL 183 are modular terminals and REL 300 --remote commumcatlon with the protec- REL 350 are t t ' I REL 400 . fon compac ermlna s. IS a

I complete line terminal for HV and EHV sys-

tems, including controi. This terminal also hasduplicated protection. All terminals have thepossibility of local parametration (setting andreading) via built in local MMI and/or a portablePC via ASCII PC connection. For connectionwith SCS 100 or SCS 200 the SPA-QBI fibre-optic interface is used, For terminals withoutSPA-QBI digital information can be transferredvia a SPOC to the SPA BUS and SCS 100 orSCS 200.

Table 1 shows the different types of line pro-tection available. The PYRAMID range of pro-tection, with exception for the fibre-optic differ-ential relay, is comprised of microprocessorbased relays with self-supervision. These re-lays have the possibility for remote communi-cation. This modern PYRAMID range of micro-processor relays offers increased performanceand extended range of functions comparedwith conventionai relays, see Table 2.

It is basically a decision for the user to deter-mine what cost/performance ratio is optimal

The different terminals are described in moredetail in the PYRAMID document,1 MDBOOOO4-EN.

Table 1

Symbol Description PYRAMIDrange

3Z< Distanceprotection for solidlyearthed network

REZ1RELZ100REL 316MOAR

3Z< Distance protectjon for isolated networks I RELZ100REL 316

DWD

31d

Directional wave protection LR91

MSPC

LCBII

LCB IIDL91-FLCBII

REL 010

Conventionairange

LZ96aRAZFELZ95RAZOALZ91/92

LZ95RAZOALZ91/92

RALZA/B

Phase-comparison protectionPilot-wire protection with-metallic pilot

-optical fibre

-audio tone

Directional earth fault protection for solidlyearthed networks

RN91/RE93IN

Earth fault protection for isolated networks RE 91/912IN

Additional functions

FL Fault locator

Oisturbance recorder

Breaker failure

RANZA

RCRA/REOR

REB 01031> I RAICA RAICC

SX91

10->I

Autoreclosing

I

RE~3/101

Table 2

I

Structureand additional functions

Relay type REZ1 RELZ100

REL316

MDAR LR91 MSPC

I

~~:~::~~::""nrMicroprocessorI

Multiprocessor

Self-supervision

xxxx

xxxx

x x x xxxx

xx

xx

xxIDlagnostTCof faulty module

Special options:I Fault locator(:f:1%) xFault indicator (:I: 5%) x

xxx

xxxxxx

Event recording xxxxx

xFault recording

xxx

Directional earth fault prot.

Inverse time earth fautt prot.

Fuse failure blocking x n.a. n.a.

Performance

Relay type MSPC LCB IIREZ1 RELZ100

REL316

MOAR LR91

I~:Typical operating timewith CVT

, < 1 cycle1 < 1.5 cycle< 2.5 cycle

xxx xx x

x

xx

x

x

x n.an.a

n.a.n.a.

n.a.n.a.x

x

x

x

I Sensitivi:ty:MhoOuadrilateralIndividual resitive andreactive settingDirectional earth fault pro-tection

noa

n.a.

n.a.

x x x

load discrimination:I UniimitedPower swing blocking

x xxx x x x

X1X

X1X

X1 X1 Xn.a.

Xn.a.

Xn.a

ISelectivit)l: Unit protection

Zona 1 load compensatedSeparate zero sequencecompensation facto r perzonei Single-phase tripping

xx

xx

xx

n.a.X

n.aX

n.ax

r1PUT,

POT and blocking communication scheme

Table 4

Overhead linesCablesDouble-circuit linesThree terminal linesSeries compensated linesHVDC applications

I X Applicableo Conditionai applicable(X) Overqualified

Generator protection Application natesThe protection system necessary for a genera-tor is dependent on many factors, such asgenerator size, type of driving source, systemearthing, connection to network, country anduser's praxis, etc.

The protection system shall detect and discon-nect the generator circuit at;

a) Internai short-circuits and earth faults

b) External faults on other circuits (as back-

up protection)c) Abnormal service conditions which eventu-

ally will cause electrical faults.The protection system for a generator has ex-treme requirement on dependability i e allfaults must be cleared by the generator protec.tion system as the possibility to achieve re-mote back-up does not exist.

A local back-up must thus be provided withthe provided protection system. The othercomponents of the fault clearing chain, suchas CT and VT cores, dc supply, trip circuit de-sign, etc. must also be given the same consid-eration. A typical protection block diagram fora bus connected generator is shown in Fig. 2.

Table 1 gives a recommendation of protectionto be included depending upon generator sizeand type.

Same general comments on the protection

system:a) High ohmic system earthing gives advan-

tages on damage at a fault and will also limittransient overvoltages on healthy phasesduring the fault.

b) Selectivity for earth faults, for bus con-nected generators, is achieved with currentmeasurement.

c) High impedance differential protection re-quires separate CT cores and the coresshall have identical turn ratio.

d) Back-up short~ircuit protection must bewith underimpedance or overcurrentlunder-voltage function for generators where thesource to excitation equipment is from gen-erator voltage, as the current in such cagescan quickly drop below rated current.

e) Reverse power protection is not required forPelton type turbines. The sensitivity of re-verse power protection is extremely highand CT care and cabling must be checkedto achieve small angle error.

f) Breaker failure protection should be imple-mented, if remote backup tripping timescannot ensure system stability on a failureto trip the generator breaker.

For same steam turbines, low forward pow-er protection is included in the trip criteria ofthe generator breaker, to avoid unnecessaryoverspeed of the generator at tripping.

Table 1 .Proposed protection equipment for different types of generators with different rating

II4-15 MVA

III15-50MVA

IV50-200 MVA

VLargeturbo-alternators

0-4 MVA

xxx

x I 4X

X

i x .1 3

i X

x 4 4

x xX x

3

xXX

x xXXX

xx x

Xx 5 x 5 x 5

Generator size

Protection

Rotor ollerload

Rotor earth fault

Interturn fault

Differen1:ial generator

Differential block (transformer)

Underfrequency

Overvol1:age

Stator e3.rth fault

Loss of '9xcitation

Pole-slip (out of step)

Reverse power

Under irnpedance

Unbalarlce (12 current)

Overcurrent (definite time)

Stator overload

Ove rcu rrent/U ndervoltage

Dead machine I

Breaker fai/ure

x x xXx

X76 7

6x

x 6 x 6

x xx

1 on ly necessary for steam and diesel drives2 only necessary for thyristor excitation from generator terminals3 only necessary for pump operation4 only necessary when several bars of the same phase in the same slot5 not necessary with Pelton turbines6 overclJrrent should not be used with self supported static excitation system, 7 when unbalanced load is expected

--

SE~lection table

-s),mbol ,I

Type of relay

Description REG 216REG 216C

REG I COMBIFLEX

100-series

SPACOM/others

131d87

I Generator DifferentialHigh impedancelowimpedance

x RADHA SU91aDT92x SPAD 330C

131(11>87 x

x DT92/RET316 I SPAD 330C

DT93/RET316

I Se<

UIII

59N

IStator earth fault100% based on injection1000;0 based on 3rd harm.95% UN measuring

1800;0 UN measuring

I GIX104a

UT91

I RAGEA RXIG/RXTFA

RXEG

x xSPAGseries

SPAGseries/REX911SPAGserieslREX911

p<:32

I

Reverse powerLow forward power

xx

xx

I RXPE 40

RXPE 40

Negative sequence currentInverse characteristicDefinite time

'nsc46 x

xxx

RARIBRARID

MC91MC91 IMCX913

I u,.159 x

xx I RXEG

RXEG

UT91UT91

I

SPAUseries/UKT913I SPAGseries/UKT911

13(1)1>151 x

xx

x

xxx

x

SPAGseriesSPAGseries

I Overcurrent Single-phase

Three-phaseThree-phase inverse time

13Z<21

I

Underimpedance

RXIGRXIGRXIDF

RAKZB

IT94-31IT94-3IC91-3

ZSX102

Rotor earth faultAc injectionDc injectionBalance

x RAGRARXNB4

GIX104

IWX161a

x RAKZBRAGPC

ZPX103axxx

xx

xx

xx

RXVE

RXFE

MC91

FC95

IMCX913

I UnderfrequencyOverlrequency

I t< f>

81

xx

x

RXEGRXIG 22

RXIGIRXEG

RXZK/RXPE

RAGUA

RATUB

/UKT911xx IT94-3IUT92

GZX104a

xx

xx

The new numerical generator protection termi-nals, REG 216 and REG 100 series, form partof the PYRAMID range. The relays includecontinuous self-supervision, for maximum reli-ability, and possibilities for remote communica-tionwith the relay.

Numerical generator protection terminals fromthe PYRAMID range are: REG 100, REG 110,REG 120 (REG 110 + REOR 100), REG 150,REG 216 and REG 216C.

For the available protection functions in eachterminal, please refer to the respective productcatalogues.The numericalrelay gives many advantages to

the user at installation, erection, commission-ing and during service, which gives a low life-cycle Gast and total economy.

ASS Network Contral& Protectian

Selection Guides 1 MDBO1 0O2-ENP~e8

SUB 2 SUB lr;::::;-.[i]

r{YJ

'-fY]

Alarm4 ITCSf-

~1-0

~~~ TCS \-'

IUN>~

=

~=~_I L\A

AU> I~

'::~~gI

)ccDrD

j p "":- r~~j~rAlaJ:m---

~ Mech.brakeI>

~ Turbinestop~

~~~

~ (2J::t3ld>

.-J

AlaJE -

-l_~~~Db

AlaJ"In

L;

UN>I CI~ )

(1002-2)Fig. 2 Typical protection system for a bus connected generator

Selection Guides 1 MDBO1 0O2-ENPage 9

ABB Network Controi& Protection

Transformerprotection High impedance differential protection, 31d, can

be used on auto-transformers and reactors. Itcovers one galvanically interconnected wind-ing (winding differential), but not a separatetertiary winding. Please observe the require-ment of GT data and the need for a three-phase set of GT's at the neutral side of the

winding.

Restricted earth fault protection (REF), IdoThis is a high impedance differential earth faultprotection for one winding. It is sometimesused in low impedance earthed systems togive an instantaneous protection, which ismore sensitive than the transformer differentialone. Typical sensitivity is 5%. There are sameparticular CT requirements, e.g. equal turnsratio of the CT's.

Application natesAt power transformers, protection is usuallyinstalled to disconnect the transformer at:

a) Internai short-circuits and earth faults in thetransformer and in its connecting circuits.

b) External faults on other circuits (Back-up

protection).c) Abnormal service conditions such as over-

load or overvoltage.

At a power transformer there mayaiso be auto-matics installed to switch the system neutralearthing resistor, which is closely related to theearth fault relaying of the connected power sys-tem. An example of typical relaying for a mediumsize (10-60 MVA) transformer is shown below:

Protection devices built inta or mounted onthe power transformer.Oil immersed power transformers usually havea gas detector and oil surge detector (BuchholzAlarm and Trip device), which are excellent fordetecting internai faults. Load tap-<:hanger com-partments may have a similar overpressure de-vice.

Temperature monitors for oil temperature pluswinding temperature provide good overload pro-tection. Unlike thermal current relays they re-spond also to loss of cooling.

Sets of auxiliary and flag indication relays to con-nect to the contacts of the transformer protectiondevices are available.

Transformer differential protection, 31~,is widely used as an instantaneous protection forshort-circuit faults within the differential zone.The most common type of protection is the cur~rent restraint type. Each such protection relayhas a number of three-phase "restraint inputs"with stabilization for through-fault current. Usu-ally the number of restraining inputs is chosen tobe equal to the number of th ree-ph ase windingsof the power transformer or equal to the numberof CT sets around it. For further information see"User's guide" or "Application guide" for trans-former protection.

Some types of differential relays require inter-posing CT's for CT ratio matching and/or phaseshift.

Earth fault protection of transformer windingsand connecting circuits. The type of systemearthing very much influences the choice ofprotection. For high impedance and resonantearth ed systems the following are available:a) Delayed sensitive residual current relays

with release input from neutral point(residual) voltage relays,

b) Delayed directional earth current relays

c) Transient directional earth fault relay

d) Delayed neutral point (residual) voltage re-

lavs.One earth current relay type with 2nd harmon-ic restraint is available, I /121, It is used in solid-ly earth ed systems on the power supply side ofthe transformer, to achieve a delayed and sen-sitive (e.g. 100-200 A) earth fault protection,unaffected by transformer inrush at energiza-tian.

Back-up short-circuit and earth fauttprotection.A variety of relays are available:Overcurrent, 31>, Earth current,I.,b., Underim-pedance, Z<, Directional Overcurrent, 31> ->,Distance, Z< ->, Neutral point voltage, UN>,relays.

For step-down transformers which feed highimpedance earth ed low voltage systems, thereare relays to detect flashover from H. V. to L. V.side, and combined flashover and L. V. sideearth fault detection.

Other types of relays at power transformersare: Thermal overcurrent, I>, Overvoltage, U>,Overfluxing (overexcitation V/Hz), U>/f,Delayed undervoltage, 3U<, and Voltage regu-rating relay for tap changer controi, U< >

Other types of relays have ratio and transformergroup correction as setting parameter. See de-scription of respective type of relay. InterposingCT's can at specific cages also be used to re-duce the length of 5 A CT circuits and thereby theCTburden.

ABB Network Contr'ol& Protection

Selection Guides 1 MDBO1 0O2-ENPage 10

Selection table

Symbol Function Type of relay

IECI ANSI COMBIFLEX 900--SPAD 330C

MODURES SPACOM

31&1> 87-rDT92DT93

DTN920

Transformer differential 2-3 restraininginputs + overcurrent and/or overload (O.L:or differential with 2 restraining inputs +overvoltage + overcurrent or O.L.

1 31&> 31>.

(3U»

(I ~ )

RET 316

31d 87

Id.Jo, 871-J ISPAE 010/011SPAJ 115C

1 31> 50.51(+I?) (51 N)

Overcurrent, inverse time(+earth fault)

I RACID

RXIDF

1

-IIC91-3 I SPAJ 140 Series

SPAJ 300 SeriesIKC911/2/3

I RACID RXIDF

RXIG

IIT94-3

IKT941/3131> 50.511(+1*) (51 N)

Overcurrent, definite time(+earth fault)

IRMX913+IKC913

I RMX913+IKT943

IKC911

IKT941

I RMX911+IKT943

Transient directional earth fault RXPG 41*-> 67N

SPAA 300 Series31> 50.51 I Overcurrent +1.-> 67N directional earth faultUN> 59N INeutral point voltage

(Residual voltage)RXEG UT91 I SPAU 300 Series

SPAC 534CUKT911

SPAJ 300 Seriesj 31>1/121

50.51 I Overcurrent +51 N 2nd harrnonic restraintearth fault

I.SPAU 300 SeriesSPAG 534GSPAU 130G

UKT911/3

I

RXEG

RATUB 2U>/f lOverfluxing. V/Hz inverse time

I

(SPAM)

I Flash-over + L. V. earth faultDito in combinationwith static converters

RAERA

RAEUB

114tuN>

Trip relay set

UKT911/3Undervoltage protection RXEG UT92u< 27'

87T50.51(59)(49)

(59)

59N

Selection GuidesABB Network 'Controi& Protection

1 MDBO1 0O2-ENPage 11

.

u§~

:00

---

)31>

~I~

~>--,

iII.II

!

, (

Fig. 3 Typical protection system for a transformer

Shurit reactorprotE~ction A two-stage overcurrent protection is suitable.

An instantaneous stage can be set above themaximum inrush current, e.g. above two timesnominal current. An inverse or definite time-lag step is set to avoid operation at maximumservice current and inrush current.

Application notesThe types of reactors considered are the com-mon types:a) Three-phase, oil immersed reactors with

gapped iron coreb) Three-phase sets of air-core reactors, of-

ten Thyristor Controlled Reactor (TCR), be-ing part of a Static VAr Compensator (SVC).

Earth fault protection. A suitable type of relaydepends on the system earthing and the levelof earth fault current. In effectively earth edsystems, the differential and a back-up earthcurrent relay is suitable. Inrush current shouldbe considered. If for som e reason a sensitivedifferential protection is not chosen, a re-stricted earth fault protection can be used.

a) Oil immersed shunt reactors.The purpose of the protection relaying is todisconnect the reactor and limit damage incage of internai short-circuits, earth faults, in-terturn faults and overvoltage or overioad. Thereactor forms a certain impedance for ratedfrequency, and as it is shunt connected, anoverload may be caused by overvoltage orharmonics in voltage and current. In Fig. 1 anexample of a protection arrangement is shown.

For internai faults, a gas detection and oilsurge device (Buchholz Alarm and BuchholzSurge) and current differential protection areprovided. The Buchholz device detects the ef-feGts of an interturn fault. Sometimes there is aneutral reactor between the neutral of a three-phase reactor and earth. Fault detection in thispart is difficult, because there is normally novoltage or current in this part. It is usually fittedwith a Buchholz device.

In high impedance earthed or unearthed sys-tems the usual types of earth fault relays in-tended for those systems can be used, e.g.delayed earth current and neutral point voltage

(residual voltage) relays.

The shunt reactor protection relays can besupplemented by trip relays, lock-out relays(to prevent unwanted energization of a faultyreactor), tri p circuit supervision, and breakerfailure relay. A shunt reactor can be connectedto the system in different ways, through a dedi-cated CB, to the tertiary winding of transform-er, or through a disconnector to a transmissionline. The tripping arrangement has to be ar-ranged accordingly. At connection to a line,tripping of the line CB, blocking of auto-reclos-ing and transfer trip to the remote end shouldbe arranged. Transfer tripping can use a powerline carrier (PLC) link. It is recommended thatthe shunt reactor is connected on the stationside of the PLC line trap. In this way the reac-tor will cause minimal diversion of the PLC sig-nal.

The differential relay, 31d. can be of the sametype as that used for generator differential pro-tection. It can be of high impedance type, or ofa sensitive current stabilized type. High imped-ance relays require an equal CT turns ratio onthe phase and neutral sides, (6 CT's). Typicalsensitivity is about 5% of nominal reactor orCT current. It is usually appropriate also asearth fault protection.

The differential measurement compares thecurrent, phase by phase, at the phase connec-tions and at the neutral connection. The inrushcurrent does not appear as differential, butrather as a through fault current. Harmonic re-straint of differential protection is not neces-sary.

Overcurrent protection, 31>, is usual as aback-up protection. A shunt reactor will get aninrush current at energization. The maximumvalue depends on the reactor design, but isgenerally smaller than for a transformer. Atleast in same phase it contains a dc compo-nent and harmonic distortion.

b) Air care reactor, e.g. Thyristor ControlledReactor, TCR.The reactor is connected in delta (Triangle)and assumed connected as a smalllocal un-earth ed system part, connected through atransformer to the power system.

A three-phase differential protection 31d, forphase-to-phase short-circuits is included.Three CT's are connected to each phase mod-ule as shown. In this way full coverage of thethree legs is obtained.

Please nate that for high impedance relays,the three sets of CT's shall have equal turnsratio and suitable data. The back-up short-cir-cuit protection may be an overcurrent protec-tian, common for a few objects, such as TCRand filter banks. As earth fault protection in alocal isolated system, a neutral point voltage(residual voltage) relay can be used.

The overcurrent relays used should have a lowinfluence on the dc component, i.e. a low tran-sient overreach, and they should have a highresetting ratio. This means that the inrush cur-rent has less influence on a low set overcur-rent relay. Especially for instantaneous anddefinite time delayed function, it is also advan-tageous if the relay has reduced sensitivity to

harmonics.

Selection GuidesABB Network Controi& Protection

1 MDBO1 0O2-ENPage 13

Overvoltage, JU>, and undervoltage, U<.relays can be included to operate at abnormalservice conditions. At low voltage the synchro.nization of the thyristor triggering can be dis-turbed.

gard to that of the reactor. The heating effect ofthe reactor may be frequency dependent (skineffect). The reactor manufacturer should pro-vide this information. A thermal relay with set-table frequency dependence is advantageous.(E.g. type RXVE 45 or the three-phase ver-sion RXVE 43 + RXTIP 41.)Thermal overload protection,I? One form of

overload protection is obtained by the overvoI-tage relay. It may however also be desirable toprotect against overload by harmonics too.Temperature detection in a dry air care reactoris difficult to arrange.

A negative sequence current protection, Insc,will detect unsymmetry, which might be causedby disturbed thyristor controi. It can be a sepa-rate relay or be included in the thyristor controi

system.A thermal current relay can be used. The ther.mal time constant should be chosen with re-

I Overcurrent. definite time

(+earth fault)I

Overcurrent, inverse time

(+earth fault)I IKC911/2/3

---I (Restricted earth fault)Id

--,SPAE 010/011

SPAJ 115C

,

SetSOf auxmary and 11ag relays forIreactor monitors, Buchholz,overtemperature

I~SF1

etc.

RXMS1RXMH

2 etc-> (I 94X

I

Three-phase Overvoltage,(or Undervoltage), definite time

IUT~4

b

r UKTmr UKTm

1UT91/UT92IUKT911

-f Single=phase Overvoltage and

UndervoltageI s~u 130G

I

UKf913

---\ Single-phase Overvoltage and Undervoltage, definite time or inverse time,I neutral point voltage

rRXEG

21 :uTRt--

I SPAU 300 SeriesSPAU 110C

IUKT911

I. Neutral point voltage(Residual voltage)

!

(OverllUxing,~) Inverse time-lag

I

U/b~

I RATUB 2-

Thermal overload, three-phase set (SPAM)

I

RARID

I

MCX913--

Negative sequence current(unsymmetricalload)

Less commonly used protection is put in brackets above ( j.

59I (27)

59(27)

-

(1002-4)

Fig. 4 Typical reactor protection system

Distribution feederprotection ~

r--<

Application natesThe protection system for distribution feedersis dependent on several factors, such as:

-Type of system earthing

-Authority requirement on e.g. sensitivity

-Cable or overhead lines

-Type of load

-System arrangementIn the selection table below the applicationareas for the different products are shown.

(1002-5)

r- -

Selection tableI Function -

SPAU I SPAJ I SPAJ I RACID I RAClF I. RXPEI I RXPG 140 140 300 1) RXIDF

Serie.. Series

SPAA I SPAA I SPAC I SPAC 120 300 300 5302)

Series Series Series Series

DPU REL I RADHL316 ~

xx

xx

xx

x x)C

xx

xxx x x

~~~Uit protectionTwo-phase overcurrent

~~~~~se overcurrent

Directional current

I Line differential

i Distance protection

I Earth fault protection

I Nondirectional, sensitiveI

I Nondirectional, high set

I Directional 0°/90°

Transient measuring

! Thermal overloadI protection

~~~eAutoreclosing

\ singl:=.:hotI Multi-shot

~~~~:k X

I ~~n~r~1Single busbar

Double busbilr

GIS

Measuring

Current

Voltage

Power

Serial comml"nication X I

Remarks1) Self powered2) Disturbancl~ Recorder (optional)

x

xx

xx

xx

xx

xxx

xx

xxx

x xx x

x x

x x

x xxx x x

x

x xx

x

x x x x x xxxx

xxxx

xxxx

x

)( x x x x

Selection GuidesASS Network Controi& Protection

1 MDBO1 0O2-ENPage 16

Motor protection,I

Application natesThe protection system for motors is dependenton several factors, such as:

-Voltage level

-Motor size and type

-Cable or overhead lines

-Type of load

-System earthingIn the selection table below the functions avail-able in different motor protection packages areshown.

(1002-6)

SPAM010

Series

SPAM050

Series

SPAM150C

SPAG32OC

I Funlction SPAC I RAMDE

537C

PRO'STAR

SACO I RADH~16A3

SPAD330C

SPAU130C

SPAU rRAGPC300

xx

xx

xx

xx

xx

Short-circuit protection--Twc)-phase overcurrent'--- -Throee-phase overcurrent

ri5jff;erential, bia sed -~Diffoerential, high imped~ Earth fault protection

-Nondirectional, sensitive

--Nondirectional, coarse

--Thermal overload

pro'tectionI - Tw()-phase

-Three-phase

Stalrt-up supervision ==

Sta.!1 protection-

Starting time--Start-up counter

-Phiase unbalanceprotection -Definite time

-Inverse time

se sequencetection

rrect '

oss-of-load protection--

ercurrent

rmal supervision

h PTC thermistors

h PTC sensors-'

s-of-excitation

tection

erreactance

tage supervision

x

-x

x x xx

x x)( x

xx

xx

xx

xx

xx

xxx

x xxx

xx)(

xxx

xxx

xx

-x xx x x x x

x x x x x

x x ~fJ ~ yi) ~ yi} x

x x

)(

xx

xx

xx

lOvervoitage--Urldervoltage-

~ ontrOI Single busbar

Double busbar/GIS

Mt~asuringCIJrrent

[VC>ltage ~I PC)wer

x xx

x x x xxx

x xx x

1--st-:;rlåfcommuiiiCafu-;;n--l

1-X---lx I xlx-r- j x 1x-1--j x lx-I x j1T

C:an be set out of flJnction