2820A_311_I.pdf

Individual Manual Application Sheet

Technical Publications Number

2820A

Secton Applicability

SWBS Number 311 SWBS Element Title SHIP SERVICE POWER GENERATION

Section Identifier I

Equipment Functional Description

VOLTAGE REGULATOR - MODELS

SR4F & SR8F

CI Functional Description ESWBS Code Remarks

Planset Hulls

905-WMEC 905, 906, 907, 908, 909, 910, 911, 912, 913

IINSBWUCTIIQM MANUAL

FOR

VOLTAGE REGULATOR

Models: SR4F & SR8F Part Numbers: 9 Q597 00 108 through g059700111

Basles Electric -s Highland, I Publication Number: 9 0597 00 99X

Date: March, 1970 Revision €3: December, 2 987

WARNING

To prevent personal i n j u r y or equipment dasage, onLy qua1 i.f ie? technicians/operatass should i n s t a l l , oper-a t e , cr sarvica this device.

Meqgcrs and high potential t e s t equippent shouZd kc used with cxtrcne care. I rlcolrrect use of S U C ~ Z e q u ip-ment could damage components contained in t h e device.

01 BkStER ELECTRIC COHPAUY, WTGHLAND, 11. I T 15 LQnUED FOR COHFIDEHflAL U S E . SUB3JECT 7 0 kCTUPR ON RECUESI , A N Y I r H THE HUTWAL IJHDERSTAHCIU; T H A T t f Y f L L WCT R E USED I M AM1 HAAHER D C T R E Y ~ ~ T A L TC THE td lEQF5TS OF GASLER ElECTElC CCPPANf.

the 3rtm:im cf th is m m a l to cwcr e l l details 8nJ varletions i n c q u i ~ n t , nor &$.T i t pro-vide dat-, I c r c w r y pws!ble cmrt i n m y rcgardfny in-stal lat i lmcr tp ra t lm. Ille am<l:tFdifty x -dhs ign of s l l features n x opriorr; o m subjcct ra m i f i c o t i m ui t h m wt Tee. S9mid fl~rtlte- informtion lw r c q ~ i r ~ ? , 1 CAI Lar l r r ifcctric ~mpwy* Higtl:mj. I l l i w T y . ---

TABLE OF CONTENTS

Section 1.0 GENERAL INFORMATION

D s c r i p t i o n . . . . . . . . . . . . . . . 1 . 1 Purpose . . . . . . . . . . . . . . . . . 1.2 Appl !cation . . . . . . . . . . . . . . . 1.3 General . . . . . . . . . . . . . . . . . 1.4 Standard Features . . . . . . . . . . . . 1.5 Accessories . . . . . . . . . . . . . . . 1.6

Section 2.0 RR1NCIPtES OF OPERATIQti

F u n c t i o n a l Circuits . . . . . . . . . . . 2.1

SectSon 3.0 INSTALL4TION

Hounting . . . . . . . . . . . . . . . . . 3.1 El~ctromagnetic Interference (EM1 F i 1 terl. 3 .2 Interconnection . . . . . . . . . . . . . 3.3

Sect ion 4.0 DPERATION

General . . . . . . . . . . . . . . . . . 4.3 Voltage Shutdom . . . . . . . . . . . . . 4.2 Voltage Regulator Adjustment . . . . . . . 4.3 I n i t i a l Oneration . . . . . . . . . . . . 4 . 4 Field Flash ing . . . . . . . . . . . . . . 4.5 Parallet Operation . . . . . . . . . . . . 4 . 6

S e c t ton 5.0 PARALLELING

General . . . . . . . . . . . . . . . . . 5.1 P r i n c i p l e s of Operat ion . . . . . . . . . 5 . 2 Installation Instructions . . . . . . . . 5.3 Operation Instructions

S e c t ion 6.0 MAIFITEHI\NCE, REPtACEHEMT PARTS AND ROUBtESHOOTtFIG reve en t i i c Maintenance Corrective Main ten ance Warranty and Repair Service . . . . . . . 6 . 3 Rep1 acemen t Par ts . . . . . . . . . . . . 6.4

Section 7.0 DRAWINGS

GENERAL INFORMATION

1.1 DESCRIPTION

T h i s m a n u a l contains a description, p r i n c i p l e s o f ope ra t ion, i n s t a l l a t j o t ) and operat ion i n s t r u c t i o n s , main?erlance artd troub:eshooting information.

out1 i n e , schemat ic 3nd interconnection drawinqs per l a i n i c g t o the f c l lowing v o l t a g e regulators manufactured by Ensler € 7 e c t r i c Campany.

SR 4F3 (Three Phase Sens ingE SR8f l ( S i n g l e Phase Sen5 i n g ) SR8F3 ( T h r ~ e Phase Sens inc3

1.2 PURPOSE

I t r e ~ e regulators a r p u5ed to precisely control t h ~ ou tpu t voltaye of a n et power- u e n ~ r a : i n g sylj terrr. G h ~ y r e g u l a t ~ t h ~ g f n p r a t a r uol tage by con trcl l in! thr-amount of c u r r e n t supplied t o t h e exciter o r genera tor f i e l d .

1.3 APPLICATION

i h p s ~ l regulators can be used w i th any geqeratinq syster t h a t has ~ X c i t e r or generator f i e l d powr rpquirwnents wi th in their r a t i n g ? (See Tahlc 1-11. This lnciudes brush t y p e rotary exciters, b r u s h l ~ s ; rotary excilers, nr d i r ~ c t e x c i t a t i o n i n t o the generator f i e l d . Tahle 1-1 l i s t s the regulator sensing vol t a p 5 below 600 Yac. These regulztcrs can 21so be used on high voltage l above 600 Y ac) genleratlng system3 wken appropriat~ rtep-down p o t m t i a1 t ransforrn~rs are used.

T a b l e 1-1. Specifications

' Sensing (Terminals E l , E 2 and E 3 ) Vol tage 120/208/240/416/4s0/600 Vac \;A (Maximum Continuous 1 Less t h a n 10 VA per l i n e , Input Power (Terminals 3 and 4) 5R 4F - SR8F - Voltage iUI3-132 Uac lW-264 Vac kurd er.1 8 2'3 16GIF

Maximum Cmtirluous 63 Vdc a t 7A 125 Vdr: a t 7111 Maximum Forcing 90 Vdc a t ICJA ESO Vdc a t 1UA DC F i e l d Res is tance (Min.)

59/60 1111

Pol tagc Regulation Less than - +114%

Less than 1 cycle

EM1 (ElectromagnetTc Interference) MIL-Sf0-4618, Part 9 , UM04

(See f jgures 3-2 and 3-3 f o r Conducted, Radia ted , o r interconnection requirmen t s 1. 5usceptiSi 1 i ty

Voltage Adjust Rangc - +IB% o f Nominal V o l t a g e

162 Vac, 324 Vac 156-168 Vac, 312-336 Vac

Anbi en t Operating Tmperature -550C +70Y (-67°F t o +I5871

Storage Temperature -65T t o +lDrJC (-85°F t o +212"F)

Temperature Cocff i c ien t Less than +1/2% for 5a0: 1122TE t~rn~cra ture c hangc (a f t er 20 minutes warm-uo)

Power D i s s i p a t i o n Less than 60 w a t t s

V ibrat ion - Test& t o withstand 1.36 from 5 t o 26 Hz, 0.036" d i s p l acelne~t from 26 t o 52 Mz and 5 6's from 52 t o 260 HZ.

Mauntinp - Designed t a be mounted directly on gasoline, dSesel o r turbine-drivc'l generator systems.

Pa ra l l e l CornpensatSon Accepts 5 Amperes 15 V A I from (Terminals I and 2 ) extern a1 cur ren t t r ans f ormw

Droop Ad jus tab1 e t o aparoximatel y 5% o f n m i n a l vof tage

Overall Dlrnensions

17.750 inches

13.5 inches R.0 inches

Approximately 50 pounds

1.4 GENERAL

The S54F and S98F vol t a g c regulate?-5 a r e s o l i d s tz te , conta in no c l e r , t r o l y t i l ; c a p d c i :or3 and h j v p d 5 0 1 i d sLate bui Ed up c i r c t ~ i t. They 3t-I?

re1 a t i vcly ?rn3r:lccterl by Letoperd Lure, humid i Ly, v i b r a t i o n or shack and condlrcti ve d w i t . (Ser Table 1-1. ) A l l c m p o r ~ n t s are mounted i n a formed 5 h m ? t - ~ e t a l ewlos%-c.

1.5 STANDARD FEATURES

1.5.1 Q t l l Suppression

Thew. regulators contain an i nter r~a l el~ctranagnetic interference f i l l c r (fM1). This f ' i l t e r reduces t h ~ $:dl 3evcl t o w i t h i n t h ~ s p e c i f i c a t i o n s o f EIL-STD-4513, Part 9, VEOL, c o n d a c t ~ d , radiated, and s u s c ~ p t i b i l i ty , and S . T . S . P . R . P ~ r b l ication l i A and V?E fi!378/6.77 Dated Junc, 1977 ("6" and "Nu 1 irn i t s f o r conducted and ''G" , and "i" ? i m i t s f o r rad'atedj . Xa meet this specification, thc regulator c h a s s i s nust be norrnFcd w i t h i n i t s enclosure, the F+ and F- lpads must he a tw i r tcd s h i ~ l d e d p a i r grounded only a t the regulator C ~ ~ S F ~ S , a n d r h ~ 6 and 7 l ~ n d s t o a renotply mountcr! voJtage ad lus t rhcostat ( i f used] nusf. be a twisted p a i r yr~r1un4rtI d t I~I'TI ~ ? ~ I c ( T ,

1.5.2 Parallel Cmpensztion

~ P S P T P ~ I I ~ a t o r s c o n t a i n the neresxzry provi s ions for para 1 l el generator opara i i on. The on1 y sternal cnrnponent r ~ q u i red I r a crrr-rent t r a n s f c l m c r to Tense g e n e r a t ~ r 1 i ne c u r r ~ n t . T ~ P r ~ g ~ ~ t ator can he opcra t e d para 1 1 e l droop canpensa t i o n r r c a t i ve droop coepensat ion) o r p a r a l t el crnss-current compensa t i o ~ (reactive d i f f went 4a l conpensationl . The current transfomer should have a standard 5 anpere secondary r a t i n g . The GT burden o f the paral lel crmpensetiofi &17-c8~5t $ 5 5 '!h.

1.5.3 Overvoltage and Underfrequency L i m i t i n s

These regulators conta in internal circui try t k a t 1 i m i t s overvol tage condi tlonc; t o approx inately 162 lrac f o r the S44F and 324 Vac f o r the S43F.

T h i s limit i s a d j u s t a b l e (+57:j by R52 l oca t ed or: t b p PC board. Thc r e g u l a t o r i?

deslgned t o wi t h s t a n d the ytrrss ot continuous c n d e r f requency opera t lor; a s low as 30 Yz. However, thc regirl ator w i 1 1 a t temp t t o maintair? rz ted vcl tage Tndcpcndent of frequency. Sharefore, the excii~r f i e l d w ind ing n r o t h ~ r nagnet :c equipment c o u l d be damased by cont inuous l~nderf requency opprz t i on.

1.5.4 Val t a g c Stability P r o v i s i c n s

Each rcyal a t o r c o n t z i n s t h e i n t e r n a ? circui t cornpanents necessary fnr vol tage s t a b i l i t y on b r u d hype c x c i tcr appl i c z t i o r . ~ , bruslrl css cxc i tc r ~pplicatians and Mhen the reculotor i s operated 2s a s t i i t i c e x c i t e r d i r e c t l y i n l o ttre gene ra to r f i e l d .

1.6 ACCESSORIES

a. 3 h ~ fallowing a ~ c e s s o r l e ~ are a v a i l a b l e for use w i t h the SR4F and SR8F vol tags reg u l alors .

( 1 i Power Transformers E 2 j Para1 let l ng Current Transformers

23) E x c i t a t i o n Support Systms (Series Boost Optiansl ( 4 ) Underspeed-Overvaltqe Control Modules IUFOV) ( 5 ) Fanual Voltage Control Fodules IKVC) I GI V o l ts-Per-Hertz Sensing MOd~les

b. Infomat ion covering these accessories may be obtained by consul t ing the applicable instruction manual or prduct bulletin or by cootacting your nearest Basler Electrfc Sales Representative o r Basler E l e c t r i c Company, High1 and, Illinois.

SECTION 2.0

PRllMClPLES OF OPERATION

2.1 FUNCTIONAL CIRCUITS (Refer to Figure 2-11

2.1.1 E e n ~ r a l

The vol tag? r e g ~ ~ t a t o r senses the generator o u t p u t v o ? t a g c , and compares a sample o f tha t vol tage w i t h a reference voltage and supplies t h e f icld power necessary t o maintain the predetermined r a t i o between the generator v o l t a g e and t n ~ reference. The u n i t c o n s i s t $ of four b a s i c sect ions: lro;tage sensicg, p r i n t 4 circuit hoard, power controller and para?lel compensatiorl.

. PULSHYG CIRCUIT

STABItl Z ATION

NETWORK

COMPEHSATIUN GENrnATOR

OVERVOLT AGE

F i g u r e 2-1. Voltage Rcgul a t o r Block Diaq-an

2.1.2 V o l t a g e Sencine

The vol tagc regulator senses the generator ac voltage on t e r m i n a l s E l and E3 on single phase serlsing models and on terminals El, C;I and E3 on three phase sensing rndeI5. Sensing transformer(s) s t e p down thp wol tage which i s converted t o dc by diodes m the printed circui t board and filtered by a choke. This filtered dc sigt lal i s appl ied t o the i nbeg ra ted c i rcu i t on t h e printed c i r c u i t board.

2.1.3 Printed Circuit Board

The p r i n t e d circuit board contains t h e following:

a . Integrated Circuit (1,C.I - The I.C. contain3 t h e reference voltage and error amp1 i f i ca t i on circuitry.

b. Pulsing Circu i t - The p u l s i n g circuit contains a uni junct ion t r a n s i s t o r . Its output pulses f i re Iturn on) the SCR's (thyristors) i n the power control Jer circuit. The conduction t i m e (when S C R b s are f i r e d ) i s det~rmined by t he I.C.

c. Stabilization Networks - The u n i t contains the various stability c i r c u i t s for brush t ype exciters, brushless exciters and static exciter applications. The c i r c u i t reqdired can he selected by the stab i l i t y s e l e c t i o n links on ter-mind1 s t r l p T52. Also provided i s a stabl! i t y adjustment potentiometer R 1 1 .

d . Voltage Range Adjustment - Potentiometer R14 varSes t h e r a n g p of thc external vo l tage ad j u s t rheostat.

e . Ogervel tage Liml t - T h i s overvoltage c i r c u i t l i m i t s the rol t age appl ied t o t h e regulator power Input (tcrrndnalr 3 and

4) t o approxinately 162 U ~ C f o r t h ~ SR4C and 324 Mac for the

SR8F.

f. Automat ic Voltage B u l Id-Up tfrcuit - Voltage build-up I s acconplished without a re lay or o t h e r rnov4ng p a r t s .

2.1 .4 Power Cmtroller

The power controller c l r c u l t cons7sts o f SCR's [thyristors) and diodes.

The conduction t i m e o f the $Cl's and t h e res is t znce o f t h e f i e l d wlndfng d e t e r m i n ~ the amount or current suppljed t o the exclter f i e l d .

2.1.5 Para1 lel Corn~enratian

Thfs rlrcui t a1 lows para1 leled generators t o share reactive loads and reduce c i r c u l a t in? currents betweerr thm.

INSTALLATION

3.1 MOUNTING

T h i s u n i t i s c o ~ v e c t i o n cooled and should not be rnour-ted near hedt generatinq equipment or i n s id^ toZal2 y enclosed s w i tchgear where the t w p e r a t u r e r i s e could exceeil i t s operating l i m i t . Vertical mounting i s recomendw t o obtain optimum convect ion cooling. Refer t o Fipurcl 3-1 f o r d i m ~ n r i o a l s and mounting holes.

' 3.2 ELf CPROMAGNETtC IMTERFERENCE FILTER

To prevent an electrical shock hazard, t h ~ regulator chassis m u s t be connected t o the power qyst~rn g r o ~ ~ n d because f I 1 ter capacitors are cannectcd betwem the

a. 'Iic ground in9 stud f o r t h e EH: fi 'l ter i s located a t t h e bottom o f the r ~ g u l a t o r cab:wet. Korrnal ly, a good metal-to-metal l unpainted surface!

e:ectr-jcal connection frm t h j s s t r~r l t o t h e system power ground w i l l reduce FM!

t o an acceptaS le level. Thp power sys tm ground i s t h a t p o i n t t n which a1 l exposed metal parts such as generators, swi tchcaar, m e t a l walkways, steelwork of buildings, etc . , are bonded together anc! groun.Jcd so t h a t dangerous potentials cannot exlst between them.

b . It s h a o l d he no t& t h z t a g o d electrical ground i s not n e c e ~ r a r i ly a good €Mi ground; therefor^, on appl i ca t ions wi th stringent EKI suppress ion requirements, the ground lead t o t h e re~ulator should be kept as s h o r t as possible. A copper strap w i t h a w i d t h 1/5 of i t s length i s recommended. 01 applications fnvc lv ing radio reception, EM1 suppression can be further improved by connected the system ground t o earth ground.

/, r . 4 - s B H E * kc10

C l @ ! t V t F k 5 l f M t r 1 P t l t F 6

I i

I I

'I I , *7.w* I 113 1.11

Bader frsctric HihLnd. I!ind. 0;:

I' I

,I- I - _ _ _ _ _ + - - - - - - - _ -.-h.

A17 Bfi 4 I t DPb - A 0 4

Oo3UUq19E ITJPJ. 19 5 Z l l uokt. m rlncrr

Figure 3-1. Out? i n e Orawing

S R F VOLT AGE REGULATQR

PARALLELING C . T.

POLARITICS

I - - - - - - - - - - - - c.;s FbR A - P C - PHASF Rt7TRf lnf :

REGULATOR TERMINALS

1 L - ,,--- - -

FOR A-C-S. PHhqr REfkTtO'I

PCiRALLEL SWITCH n I rh Lrr - - - - - , , , - - ,- - - - A.

0 GrN FLB.

B R l l S V TVPF FYClTEA

I

I ' J ; ~ ~ ~ U S F O A M E R S W I T C H I - - - - - - - _

C - - - - - - - _ --,------------- + - - - - - - - - - - . , L 7 ' I I+- - - - = , -;- 4 - - - - - , 1

MAHUAL CONTROL

nt4EOSThT

SRF

VCILThtE RECULAJBA

I

FlEGULATOR

TERMINALS

L - , , , , , , - - - - - - - m FOR 4-n-C POTATtQY

' SEHSllPF VOLTAGE

L----, ,,,,,,,, - 3 9

FOR A-C-CL PHASE RQTAS1'3H

BRUSHLESS

E X C IT EA

TWISTED P A I R

.r u - t -1--4: b:':L-.,&,7,,-3 . I . . . , I I EXC. FLb. 4- I

~ I E L D FPABHIMn CtRCUR '

3.3 INTERCONNECTION

CAUTION

E Me(?gprs and h i g h potential test equiprrent must n o t he used.

incorrect use may destroy t h e regulator.

3.3.1 General

The regulator m u s t be connected t o the generator system as ins t ructed i n t h i s section and as shown i n t h e b a s i c int~rconnection diaarams (Figures 3-2 and 3 -3 j . Number 1 4 gauge wire l o r larger) should be uscd for a l l connections t o the regu l a t o ~ .

3 . 3 . 2 Yo1 tagc Rcqulatnr Scnsinp (Terminals El, E2, and t 3 )

a. The regulator has an internal sensing transfarmer(s1 T 1 (T2) w i t h taps for sensing vo l t age of 120, 208, 240, 416, 480 and 600 Vac. S i n g l e phase sensing rnod~ls have transfotmer T1. Three phase sensing models have two t ranrfonners, T I and TZ. A l l the t a p s fo r the var ious sensing voltages are brought ou t t o t he regulator terminal strip. The sensing conl'iect is? i s made t o the terrnina7 with t h e voltage t h a t matches the gener~tor vo l t age t o be serl~ed.

On s ~ n g l e phase sensing nodels, t h e sensing Feddr are connected t o t e r m i n a l E l , and t o the corresponding val tage terminal under €3 . On three ~ h a s e s e n s i n g models, the sensing l eads are connected t a terminal El and the corresponding v o l t a g e terminal under 22 and E3.

b. On generating systm w i t h voltages above 600 Vac, instrument t y p e p o t e n t i a l transformers must be used t o s tep dollrn tire voltage t o mntch arrr 0' the regulator sens inq voltages. The 1-egulator scnsfng circuit load i s less t h a n 10 V A per phase.

c. For precise regulation, the serlsing leads should he connected as closely as possible to the po in t wlrere regulation i s desfrild. T ~ P r~qrr1a";or regulates the voltage appl ied t o i t s sensing terminals and canno t correct for cable G r bus voltage drop t h a t may occurs a t perqts othc r than where the sensing leads are connected. The sensing I pads should no t be used t o supply the reculator power stage <terminals 3 and 41 or any other equipment. The repulators sense average values of generator vol tag? (not RMS).

3.3.3 Field Power (Termina ls F+ and F-)

The raximun contjnuous output current o f these regulators i s 7 Adc [ s e e Table 1-11. The dc rtlristarlce o f the f i e l d i n t o which the S2BC operates must be 9 ohms or more. The dc resistance i n t o which the SR9F operates must be 18 ohms or more. Lf the res is tance i s less , addi t ional res is tance must be added i n series w i t h the f i e l d . T h i s r e s i s t o r plus the f ie ld r e s i s t a n c e nust exceed the preced in9 m i n i m u m v a l u e s . Consideratiorll must also be given t o the reslstor wattage rating. (Refer t o the e s a ~ p l e i n paragraph 3 .3 ,T . I ) . When adding resistance i n series w i t h the f i e l d i t m g s t not l imit f i e l d forcing du r i ng l o a d application.

3.3.3.2 The following example shows how t o select a ser ies f i e ld resistor.

An SR4F voltage regulator i s required t o operate i n t o an exciter f i e l d ~ 4 t h a dc rerlstance o f 6 ohms. The exciter f i e l d current requ!renrent. i s 2 Adc a t no load and 4.5A a t fu l l load 0.8 pf. Since the SR4F requires a min imum f ie ld resistance o f 9 ohms, a t least 3 ohms add i t iona l resjstance are required. We select s 5 ohm resfstor and connect i t I n series w l t k t h e fqeld. Thjs results i n a t o t a l impwlance of 11 ohms. With t h f s additional resfstance added, the no load regulator oatput voltage i s 22 Vdc. The f u l l load regulator o u t p u t voltage i s 50 Vdc. The regulator i s now operating i n to an impdance ahove i t s minimtm rating protecting i t against overcurrent damage. Its output during f u l l load i s less than 63 Vdc insuring good f i e ld f o r c i n g capability. We complete our calculations by determining t h a t t h e maximum exci tcr f icld currmt during f o r c i n g w i l l be approxiaately 8 amps {90 Vdclll ohms = 8 anpsl. Therefare, the minimum res istor ra t lng should be 3221 w a t t s . (8A t imes 8R = 64 t i m e s 5 ohms = 320 w a t t s

3.3.3.2 nhsn making connections t o the rotary exciter, polarities should be observed. The regulator T+ t cmfna l connccts t o the exciter f i e ld p o s i t i v e t e r m i n a l and t h e F- t e r ~ i n a l t o the negative terminal, W i t h btush type rotary exciter applications, it i s Smportant t o observe polarities between generator f i e l d , exciter output and exciter f i e l d . They should be as shown i n the interconnect ion diagram, Figure 3-2. 12 the polarikies are not known and the system has manual valtage control , polarities can be determined by operating t h ~ system on manual voltage control before connecting the regulator, 3 . 3 . 4 Fleld FlashSng Input (Terminals FO and F-E a, The regul ator contains an internal: automatic voltage bul Id-up c i r c u i t ;

therefore, external f l ash ing should not be required, However, i f t h e generator residual voltage i s less than 10% o f rated voltage, f l a s h i n g way be necessary.

The dc f lashing source connects to F- and FO. An internal blocking diode prevents the regulator output current from flowing i n t o the f l a s h i n g scurce.

b. T h e dc f lashing current should not exceed 1/2 of the no load exci ter f i e l d current. If necessary, connect a current l imi t inq resistor in series with the FO terminal.

c . The flelrl f l a ~ h l n r j source must he rmrovcd af tc r nominal generator voltagc i s obtainerf. T h i s can he accornplishcrl w i t h a purbhrltton or s w i t c h on m a n u a l f i e l d f l a s h applications, and w i t h a relay an automatic f i ~ l d f l a s h appl icatfons. I f a r t l a y i s used, it should sense the generator voltage and open the f l a sh lng circuit a t approximztely 70% o f rated vcltagc. On autmat ic f i e l d flashjng applications, provisions (such as speed switch) must be made t o open the flerr! f l a s h i n g c i r c u i t when the generator i s secured Enet r o t a t i n g ) , For proper c o n n ~ c t i o n instructions, r ~ f ~ r t o Interconnect ion diagtam, F i g t ~ r e 3-3.

A l r n r ~ v i e w paragraph 3.3.7 i f t b ~ f l ash ing qaurcP i s grounded,

3.3.5 M o d i f i e d Voltage Regulator I n p u t CTcrrninals 5 and 81

These terrnjrlals are used only oo special m o d i f i e d versions, for which special w i r i n g instructions w l l l be providcd t o exp la in their use. Connef t ions must not bc mzde t o terminals 5 and H when used i n normal ac ge~erating syctms.

3 . 3 . 6 Voltaae Ad-just Rheostat (Terminals 6 and 7 )

The external rheosta t i s rated 500 o h s , 25 w a t t s , I t connects across te rmina ls 6 and 7. Figure 3 -4 shows out1 i n e and mounting dimensions and t h e jumper connections.

sC--*. JUMPER SHOWN FOR

INCREASING VOLTAGE

WITH CLOCKWISE

ROTATION.

.t--

F i q u r ~ 3-4. Out1 ine Dr . r iw i r~y, Vo l taye Adjust Rheostat P/N 96874

3 . 3 . 7 Power I n p u t (Terminals 3 and 4)

a. The maximum contirluous input r a t i n g i s P K l \rA f o r the SFI4F, and 1653 V9 f o r tl:e SR8F. (See tab le 1-11. Thc current requirements of the f i e l d i n t o which the regulator aperat~s deterrnincs the actual input VA f o r a particular application. The nominal voltage appl ied t o thc ~ q u l a t o r power input stage (terminals 3 and 4 ) must he 120 Vac for the SH4F and e i t h e r 209 or 243 Vac for the S R W . The input power may be taken from any generator I f n e s t h a t providc this vo l t age I l i n c t o l i n e or line t a neutral). On s i n g l e phase sensing madel regulators, i t i s recommended t h a t the input power be taken from a p h a s e other tharl the one used for regulator sensing.

b, Tf the generator voltage avaSlable i s d i f f e r e n t than these values, a power transformer m u s t be used t o match the generator voltage t o t h e regul a i a r power input. I f the f i e ld or f ie ld f l a s h i n g circuit i s grounded, a power isolatlm transformer must bc used t o i s o l a t e the regulator i npu t ftm ground.

Fdilurc t o urc an i s o l a t i a n transformer may result I n open fuses and regulator d mage.

3.3 .8 Para1 lel Compcnsatim (Terminals 3. and 23

Cwnplete para1 l e l ins ta l 1 at ion instructions are i n c l u d e d i n Section 5.0.

SECTION 4.0

4.7 GENERAL

Eefore T n i t i a l operation, r e v i e w t h i s section and s e c t i o n 3 .0 t o b r c e r t a i n t h a t the Installation and operation instructions are ~ r ? d e r s t o o d and followed.

Also rev i w t h e application in terconnect ion d r a ~ i n g s , f igure 3-2 or 3-3.

4.2 VOLTAGE SHUTDOWN

2 . A s w i t c b may be installed i n serles HI t h the vol tage regula-or's power i npu t stage t e r m i n a l 3 or 4. This allows val tage shutdown i n an mergsncy or when the generatcr prfme mover i s operated at reduced speed. I f such 3 s w i t c h i s not furnfshed, f t i s recommended t ha t one be ternpararily installed dur ing i n i t i a l operation. When used, t h i s switch must al-days be i n series w i t * one of the regulator's power input l ines, ternindl 3 or 4.

CAUTION

The f i e l d c f r cu f t (terminals F+ and F-1 m s t never be opened during operation. If opwcd, a dangerously h i g h f lyback voltage w i 1 1 develop.

h. A voltage shrrtdown c i r ~ u i t using f i e l d discharge resistars must no: be used; i t czn cause damage t o the regulator. Such a shutdown method i s n o t required. S a f e vol tage shutdown can be accmglished as described i n t h e aSove paragraphs.

4.3 VOLTAGE REGULATOR ADJUSTMENT

a. A l l necessary regulator adjustments a t e described j n the fol lowing paragraphs. Tkese adjustnents are made before a ~ d during j n i t i a l operation;

addiSiona1 ad just rmts are n o t usual ly required during the lire o f t h e regulator.

b. The voltage adjust rheostat i s mounted external t o the v o l t a g c regulatnr. I t i s normally s e t so t h a t a mid-range adjustment rilsul t s i n n o m i n a l generator we1 tage. When adjusted t o i ts maximum resistance p o s i t i o n (CCM), ainimum generator voltage i s obtained. Maximun generatar voltage i s ob'a incd w i t h minimum resistance (CbiI, ur d

I re m an rl w

R

I e

IT

x i7 l d r u r ru

I1S o r

I

.-k tu n J i?

rn t

O

Z

Y cu

'A y

A

N p l a

EU

rt

KD

c

-4

.d .L v w m d

P t u r w c z v v tu r

!-I

C m o r tm

It o L w r t p m V

S i ra o h c a r a d w s n3

'1

L

G fi rm

O r r p

Zn p

C k

I u

O u

O m y r

I C m

A

J

L E r r

F lA

C g p u n c a n e

J c

.k c t a

X

C

D r t

C C r* d r o c n

U

J

N f o e r w e f J

IV

ru

R

T

W h

D

H

Y

. d n m

E

W a f

A

U f D r@

L z r ,m m n:

r e tD

F U

M n

CI

=r d fC

I m w m r r n n o m m a r n c w m m r A r d a r k d m q t rC tn

.d

.O

C

T

O rr x t w n n f l

V

C

Q

I c v w n

G a a a e r l m o g;

g g ur r v rw

'3 r r L

S w s m q r

.T t.

Jt rs

O ku

Cl

Figure 4-1 - Typ ica l S t a b i 1 i t y Link Connection

Iflorma1 Sy, rep1 ators are shipped with the abovc s t a b i 1 i t y 1 ink connect ion) .

5TP.n JL I T Y L 1XK SELECT lor4 G U I D E

Brush type r o t i r y exciter Med or 53 ow Erus hless rc tary exciter o r generators rated ahuve

Srushless rotary exciter or

Para1 lel Compensation A d j u s t (R401

The parallel compensation ad jus t r h e o s t a t IRM) i s located near the tap of the regulator cn the fuse mounting bracket . I t provides a metbod of a d j u s t i n g the mount o f reactive droop cmpensat ion. I t i s factovy s e t the n e a r t h e f u l l t W pos i t ion . T h i s se t t ing provides m a x i m i n lapproximately 5 % ) voltage droop.

Thr rheostzt i s provided w i t h a lock ing n ~ t so t ha t i L can be permanently set whcn t h e amount o f droop desired i s determined, The i n i t i a l operating i n s t r u c t i o n s are contained i n the following paragraqhs. These procedures should be reviewed before operat ing the system.

a, Set the external voltage rheostat t o approximately nid-range.

b. S t a r t the prime mover and b r i n g i t up t o rated speed. If a volkage shutdown suiich i s used (see paragraph 4.21, close switch. U h c n t h i s swi tch is n o t used, generator vo l tage should bu i Id up au tma 'c ica l ly.

( E F f i e l d F lash ing i s necessary, see paragraph 4.5).

c. A d j u s t Yo1 tage Range a d j u s t (R141 u n t t 1 t h a t generator vof tage I s w i t h i n +'10"df rated. 51 ight va l tage correct ions can be made W E t h the v o T t a g a a d j u s t rheostat .

I f an overvoltage, underrol tage or u n r i a h l e vo l tage condition r ~ s u l ts, rev iw the foJ Ion ing paragraphs :

a. Overvoltaqe Condit ion 1+15% or more above rated). I f an overvol t a g e c o n d i t i o n occurs, open the shutdown s w l t c h Immediately and/or stop the pr ime mover. The regulator 9 iintcrna l overvol tag^ l i m i t circuitry shoa Id prevent an overvol tage cnnd it ion frm exceeding t h c levels i n d i c a t e d i n tab le 1-1. An oxbrvaltar~e c o n d i t i o n nay result ~ P C ~ ~ I S P t h e regut ator sensfng lead5 are not connected. If the cause of the overvoltage cannot be determined, refer to 'he trauble~hooting section o f t h i s manual.

b. Undervoltagc Condition (-15% or less o f rated]. If an undervoltage c o n d i t i o n a x i s t s , s t o p the pr ime mover and determine the cause. If necessary, refer t o the troubleshooting set'.iarr o f t h i s manual.

c. Unstable Generator Voltaqe I f the system voltage ~sc571ates or hunts, adicrst the voltaae s t a b 1 (tv ~otentiwnetcr Rli located on the ~ r i n t e d c i & i t board. i f the voltage cannot be stab11 i zed wi th R11, ~ e f e r to paragraph 4.3.2 f o r i n s t r u c t ions on s tabi l fty Sink adjustment and/or La paragraph 4.3 I f the system cannot be stabilized by any o f the ahove methods, reqer t o the troubles hooting sect ion.

4,4,? U p e r a t i m ( W i t h Load)

3. 4pp ly r a E ~ d lozd t o t h e generatgr.

b. Verify i h a t no load in f u l l load regulation i s less t han +1/4%. I f generating system has a para1 l e l lng CT, make certain that-KT s~condary i s shorted bclLore s t a r t i n g t h e test. E f acceptable r~gulation i s n o t obtained, r e f e r t o paragraph 3.2.2 and/or t h e troubles hoot ing sect ion.

c . Alternately remove and apply laad t o determine t h a t the genarator val t a g e remains s t a b l ~ . I f t h e genera tor rol t a g e becomes u n s t a b l e , r e a d j u s t R1:.

4.5 WELD FLASHING

a. The v01 tag^ regtflatnr c o n t a i n s in te rna l circuitry t o a l low autocat i c voltage bu i ld -up. The?@ i s usual l v sufficient qenerator residual vol tagc t o a1 Few qenerator ~ o l tace b u i l c - u p without f i ashinc.

h. A va:tagc build-up prcblcrn may atcur i f t h c residual voltage applied t o regulator power i n p ~ t terrr.inals 3 and 4 is less than 6 Var f o r an S l l C ~ n d 1 2 Y ac fnr an SBRF.

c. On systems where geleratcr voltage docs not b u i l d up and no f i ~ l d f 1ar hing prov isians are provided, proceed as fol 1 cws t o restore the res iduzl vo: t age, Wlth the prime never a t rest {no t rotatjng), apply a 92 f lashing source across terminals FO and F- on t h e voltage re5ulator f a r approximately three seconds. Tho positivs of t o FO and t h e o t e x c e r d 1 2 5 Vdc.

I arngcrc or less.

d . For information on systms requiring Dr i n c o r p o t a t i n g automatic or mantra1 f i e l d f lashing previsions, refer t o paragraph 3 .3 .4 .

4.6 PARALLEL OPERATION

For cmpletc information concerning para1 lel operation, refer t o 5ection 5.0.

'SECTION 5.0

PARALLELTNG

5,t GENERAL a . I h i s s e c t i o n conta ins i nforrn8t i o n p ~ r t a i r : l fig t o operation of generatar s e t s i n p a r a l l ~ l ,

b. These regulators have a l l necessary ~aralleling compencnts conta ined i n t e r n a l l y except f o r an external curr~nt transf orrnpr {an@ a U n i t -Para 1 lcl sw i t ch , i f used). This circuitry allows parallel peneratcrs t o share reactive 1 oad and reduce c i rcul a t i ng currents hetween them.

5.2 PRINCIPLES .OF-OPERATION

a . The para1 t e l i n g c i r c u i t opera tes i n t h e f a ? lowing manner. A curre??.

transformer wi th 3 t o 5 avperes secondary current a t rated load m u s t b?

i n s t a l l e d in Phase F o f the generztor. I t provi6es a signal that i s propnrti~nal i n arnplitudc and ptiasc ti? thc line currefit, T h i s curreqt s j ~ n a l (lavelops 2 voltage zcrars r e s i s t o r RzlO. The I a p on R40 supplies a pa r t of t h i s voltage t o t h r primary o f t ransf o r m x T3. The secondaries ~f T3 zre connected in S P ~ ~ P S w i t h t h e leads from the s;sconrfary ot thrz sensi ng transfortn~r T 1 rind the p r i n t e d circuit board. The ac voltzge applied t o the sensing rectifier b r i d y i s t h e vector sum o f t h e ste~ped down sensing voltag~ (terminals E l and E3 2nd t h e parallel CT signal t h roug9 T3 ( terminals 1 and 2 ) ' Tfiu vo1;sgc suppl ied t o the s ~ n r i n g rectifier by t h e para1 I e l i n g CT is small i n relation t o t h e signal supplied by t h e tensing vol tagc. The regulator i npu t sensing voltage (terrinals El anr! F.3) and the p~ratlel cnrnpensation sign31 ( t ~ r m i n a l s 1 and 2 ) must be connected t o the generator systcm so as t o provide t h e correct phase a n d p n l z r i ty re lz t ionship.

b. When a r c s i s t i v c load (un i ty P.F. ) i s applied t o t h e generator , t h e voltage t h a t appears across A40 [and T3 windings) leads t b e sensing Y O ! tage by 90 degrees. The vector sum o f t h e two v o l t a g ~ s is nearly the sane as the o r i g i n & ?

sensing voltage; consequently, almost no charrge occurs i n generator a u t g u i val t age znd/cr t h e generator f i el d exci t a t i on.

c . When a lagging peer fac to r ( i n d u c t i v e ) l o a d i s applied t o the generator, the vol taqe across 240 becomes more i n ahase w i t h the scnsi ng voltage and t hc combincd vcctors o f the two voltages result i n a large voftagc being applied t o the sensing rectifiers. Since tee a c t i o n of t h e regulator i s t o m a i n t a i n a constant v ~ l t a q e a t the sensing r e c t i f i e r s , t h e regulator reects by dscreasi ng the aenerator output vol tage and lo r t5c penoratsr f i e l d cxci LaL lon .

d . When a l e a d i n g power factor {capacitive) load i r applied to the generator, the vo l t age across R40 becomes out o f p h z c ~ w i t h the s ~ n s i n g vo l tage and thc comh in~d vectors o f the t w a v n l t a g ~ s r ~ s u l t i n a small voltage being appl i ~ d tn the sens ing r e c t i f i ~ r s . Then the regul atns reacts hy insreas-ing t h e generator voltage and/or the gencra tor f l e l d excitation.

e. When two generators are operating ir p a r a l l ~ l , if t h e f i e l d exci tatim on o n p generator shorlld hecme e x c e s s i v ~ and czuse 2 circulating current to f l ow bpiwcpn g ~ n ~ r a t o r s , this current w i l l appear as a l a g g i n g power fac tor [ inducLive: l oad t a the g~nerator w i t h ~ x c e s s i v e f i e l d current and a leading pover factor ( c a p a c i t i v e ) l o a d t o the other . The p a r a l l ~ l cmpensat lon circuit w r 1 1 cause t h e voltage regrllator tr, d~creasr. the f i e l d excitation on the gencrator w ? t h t h e l agg in$ power f a c t o r load aud increase t h e f i e l d e x c i t a t i o n on the generator w i t h the lead ing p o w w fac tor , so as t o minimize the c i r c u l a t i n g current hetween the c e n ~ r z t o r s . When circulating current f l o w between generators i s minimzed; i n t h i s manner, they w i l l cacti supply a proportion n I amount o t ineuctrve l oad current .

f . The action and circuitry just desctibed i n called parallel draop compensation {reactive droop cmpensation). Although i t reduces circr~lating current f l o w , i t allows the system v o l t a g e t o Croop w i t h increasing inductive rear: i ve 1 oad.

g. Para1 l e l cross-cutten t cmpens at ion ( reac t ive differential cornpcnsation) a l l owr t w o or more paral leled generators t o share induc t ive r c a c ~ i v e loads w i t h no decrease or droop i n t h e seneratar system voltage. Thcse regulators provide the necessary circui t i s c t a t ion so t h a t p a r a l lel cross-currcnt cornpcnscition can hc ~;scd, Th js i s accc?mpiished by the action 2nd the circuitry described previously f c r paral Ieled draop cornpensat ion, and the a d d i t i o n o f cross-currefl t connecting leads betdeen the paral lel CT secondaries as shwn i n Figure 5-1, By connectrng the f i n i s h o f one parallel CT t o t h ~ s t a r t o f another , a closed series loap i s formed which interconnects the C T ? sf a1 l generators to be paral 1e:ed. The s i g n a l s f r o m t h e interconnected GJ's canccl each other when the 1 i n e currcrt~ , are prcportional and i n phase.

REGULATOR 1

I r

REGULATOR 2

C

1) WHEN MORE THAN 3 GENERATORS ARE TO BE

PARALLED, CONTINUE CONNECT IONS AS S H O W N

21 PARALLELVNQ CT POLARfTlES ARE S H O W N A-B-C PHASE ROTbTlON

F i g u r e 5-1. Cross Current Compensztion C T ' s Intercnnnectiun

5.3.1 The regvldtor parallel compensation input cunsists of termiqals 1 an3 7, A current t rans fo rmer w i t h 2 5A secondary rating i s i n s t a l lcd i n generator 3naSe B. Thir curreat a t rated generetor l o a d . The burden o f the regulator pa ra1 lel cornpensat ion circuit i s 5 V P , .

5.3.2 A Unit-Parallel w i t c h can be used t o sho r t the parallel inq cur ren t t ransfor f lcr secondary when the system is operated as s i n g l e u n i t (no i n parallel). Shor t i n5 the CT secondary prevents a droop signal f r o m b e i n g i n j e c t e d into t h e vcll t age reculator. The system may be operated wj:hout a Unit-Parallel switch i f the drcop t h a t cccurs durinq s i n g l e u n i t load inp is n o t o b j e c t i o n a b l e .

5 . 3 . 3 The phase relationship between t h e para l l e l ing current transformer s i g n a l appl id t o the vctlage regulator terminals 1 and 2 and tbe vol tage sensing s i g n a l appl ied tc regulator terminals E l , E2 and E3 are very important. I t i s equal ly impcrtartt that the paral lcl iog current t ransform~r secondary pol ar i ty be c o r r e c t for t h e existing generator phase sequence {A-B-C or A-C-El . These connect ions must be mad^ as described i n the in terconnect ion diagrams, F ipures 3-2 and 3-3. (Ke~ulator terminal E 2 i s not u s 4 on a s i n g l e phase sen5 inrd regulator . 1

5.3.4 Connect voltage regulator terminal E l t o generator Phase A. Connect the appropr ia te vol taae t a p under regulator ternindl E3 t o qeneratw Phase C. On t h r e e phase sensing models only, connect the appropriate voltage tap under regu la to r terminal E2 to generator Phase B.

NOTE

On high va l tage generating r y s t w s (above GO?'/) where Instrument patenti a1 transformers are used t o supply regbl a to r sensing ~ o l tage. the primary t o s a ~ o n d ary polarities m u s t be maintain&.

5.3.5 The correct polarity fo r the paralleling current tsansfermer slgnal supplied t o regulztor teminals P and 2 -Is deterniled 5y the generator phase sequence. The interconnectfon d r a ~ i n g s show the p r o w ? polarity connections for bath b B - C and A-C-3 phase ratatfon.

5.3.6 I f i t cennot be determined which qmvlerntor l i n e 5 are ?hasp A, B and t , To1 1 w t h i s procedure.

a. # i t h a three phase sensing vel tag^ regul atnr, always p lace the p ~ r a l le: i n g current transformer i n t h ~ g~nerator phase t h a t i s us& to supply sensing voltage t o r e g u l a t o r tefminal €2. Whm a single phase sensing regul z t c r Ss used, p l ace the current transformer in the generator phase t h a t does n o t supply sensifig vo l t age t o the regulator,

b. When step a ) i s observed, the only unknown rmaining i s the correct pal ar i ly o f the paral lel ing c u r r ~ n t transforrn~r secondary s ignal . I f an induct4ve reactive load i s avaSlaSle , t h i s can b~ d~tormined by the t e s t as out1 in& in paragraph 5 .4 .4 .

c . I f t h e generatnr l ead outlined i n s t ~ p b) i s not available and i t becomes necessary t o parallel the generator without tno~inq t 3 e correct paralleling current transformer ssecondary polari by, extreme caution m u s t be observed or equipmm t damaae may result. I f a m o r m a 1 ly h i y h gerera tor c c r r e n t results a f t e r c 1 sing the breaker, i ~ m e d i atety rcopen the breaker, shut down t h e generating systm and reverse the secondar'y connect ions o f the para2 lel i n g current transformer ((the leads t o regu la to r terminals 3 and 2. Review paragraph 5 .4 b ~ f o r e para l lellng.

5.3 .7 15 para1 le l crass-current cgnpensation {reactive) d i f f e r e n t i a1 compensation) i s desired, make the same installation connections as described i n paragraph 5.3.5 and 5.3.6; then interconnect w i t h the cross-current loop a5 show i n Figure 5-1 and as descr ibed in paragraph 5.2.

a. Ti i s recommended t h a t the cross-curreart connecting loop be l e f t open a t one point u n t i l proper parallel operation i s a ~ h i p v ~ d w j th the paral lel droop cmpensal lon circuit only.

b. On applications utilizing cross-current cmpensatim, a unlt-parallel swi tch should h~ used t o shor t out the current transformer secondary if t h a t generator i s not on the load bus . I f such a switch i s not used, a v o l t a g e droop w i l l be introduced i n t o the system because the unloaded generator paral lel CT i s no t supplying the c~mpensating signal and allowing a voltage drop t o occur across it. This drc.p w i l l a l so cause the voltage of the incoming generator t0 fluctuate prior t o p a r a l l e l i n g . I f t h i s f 1 uctuation i 5 objectionable, an ideal so lu t ion i s t o connect w auxiliary contact on the m a i q generator circuit breaker across t h e paral lea ing eurrent transformer secondary. This auxl l l ary con t a c t must be c lored when the main breaker i s open, and men when the main generator breaker closes.

5.4 OPERATION INSTRUCTIONS

a. The Following paragraphs dcscribc t h e procedure for operating generator sets is p a r a l l e l .

To insure para1 l e l operation, these requirenents m u s t be net:

( 1 ) ?he v o t t a g , ? r e g ~ ~ l a t a r con:rol systm m u s t cause t h e g~nerators t o s h a r e the K V A R l o a d .

(21 Thc speed governing tontr~l system mu5 t cause the geseratots t o s b r e tie L'PI load.

b. Prior t o ~ p c r a t i o n , a d j u s t paral Iel cornpensatim rhccstat R40 to its near f u l l ~ l o c k w i s ~ -0ta51an position. T h i s ad ius tment provides maxicum droop signal 3nd stl~ulrl: 5e nearly i d e n t i c a l on a1 1 rcgulaiors t o be pa ra l leled.

5.4 .1 Preliminary T e s t

I f a suitable load i s a v a i l a b l e , 4t i s rccomm~nded t h a t individual generator s e t s bc tested t o verify t h a t the par21 1 el i n g c i r u i t functions properly. The following dcscribcs such a tc:t:

a. Ra?e certain t h a t the paralleling CJ secondzry i$ n o t shorted (Unit-Parallel switch 4s in the Farallel p o s i t i o n ) ,

b. With gcncrating s e t operating a t r z t e d voltage and frequency, apply from 25 t o iOO% uni ty p o w r f ac to r load. Gneeratsr voltage should no t change nore than 1%. (The frequeccy should decrease if the governor i s s e t f o r droop operation).

c. Apply a 25 t o 100% 0.8 power fac tor load t o the generator. The vo l t age should droop frm 4 t o 6% ( 4 t h f t i l l laad and w i t h paral lel cornpensat ion rheostat R 4 set near ly f u l l clockwise). If t h e v o l t a g e r i s c s instcad o f droop-ing, rrversc the parallel current transformer secondary leads.

d . Repeat t h i s t e s t on a l l generators t o be operated i n parallel. Rfter s a t i s f actary cmpl etlon of these t e s t s , tk generators shou ld para1 l e l proper1 y .

5.4.2 M o n i t o r i n g InstrumcfitatJon

70 pwaTlel generators and t o check for proper parallel operation, g e n e r a t o n should be equipped w i t h t h e f o l l o w j l g instrumentation :

AC Vol tneter - to moni to r bus rol tage and incorning generator v o l t a g e .

Frequency r!eter Synchroscepe or a s e t cf lights etc. - t o j n d i c a t e an in-pharc condit ion.

hC Amneter - t o monitor incoming generator poker.

Tt i s also desirable t o have K V A R o r Power Factor fteter and Generator or Exci ter F i e l d Ameter.

5.4.3 Condit ions Necessary for Paral lel inq

CAUTION

The incwning generator v o l t age phare requence (phase ro t a t i an ) m u s t be the same as t h a t o f the bus t o which i t i s t o 5e paralleled.

t o avoid cquipmflt damage, generators should be p a r a l l ~ l e d only a t the i n s tan t when the frequency and voltages a te nearly equal.

5 .4 .9 Paral l e l Operation Sequence

The f o l lowfng procedures are typl cal of these f o l lowed when paral leling generators. These procedures should be reviewed before attempting to paral lel .

a. Ad j u r t the vo l t age o f the incoming generator ( t h e generator t o be p r a l leled with the bus1 t o match the bur vultage.

I

NOTE

I f a urlllt-para1 le l switch i s u s d , make certain i t i s i n the paral lel pas i t ion .

b. A d j u s t the incoming prime mover speed so t ha t i t s frequency is s'ightly faster than t h e load bus.

c . Observing the synchroscope (or synchroniz ing lights), close the incorning generatcr circuit breakcr when i n phase w i t h the bus.

d . Immediately af tcr clostng t h e breakcr, observe the generator 1 ine ammeter. I t should read well within t he r a t i n g of t h e gcncrator.

If rrot, immediately reopen the circuit breaker and completely rev ieu paragraph 5.3.

e. I f operat ion after paralleling i s normal, adjust the prime mover speed con t ro l so t h a t the generator takes on load and thereby avoids the possibility of the reverse power relay t r i p p i n g the generator off 1 i n e .

f. A d j u s t voitagt and speed so t h a t t h e generator just placed on thc load bus assumes i t s share o f kM and KVAR l o a d ,

g. I f t ~ o or mare generators using the samg t ype voltage regulatnrs zrc on a common bus, vary t h e bus load and m a k ~ voltage, speed and p a r a l l e l cwrtpensat ion (P401 ad jus trnents as necessary t o o b t a i n t b e optimum load sharlng.

Para1 l e l i n g Problems

2. I f , upon p ~ r a l l e l i n g w i t h the bus, frn,xaper operati~n r e s u l t s , t r y to determine which control system i s a t f a u l t , the voltage control or the specd control. A high ammeter reading or circuit breaker opetling may occur i n e i the r case. twcd i a t e f y af tcr closing t he incnming generator circuit breaker, observe the KVAR and kU meters.

(1) A large K V R R reading (Incoming or outgoing) indicates a Caulty vol taqe r ~ g u l a t ing system.

( 2 1 A large kW loading w o ! i l r l indicate a f a d l ty syccd r e g u l a t i n g systcn.

b. Another method of determining which coqtrol system i s a t f a u l t i s t o operate the system n~ manual voltage control (on systrtmr having manual cont ro l ) , I f proper paral lc? operat ion i s obtafned on manual v o l tagc control, t he voltage regulat ing systm i s probably a t f a u l t , If proper operation i s n o t obtalncd, the spepd r ~ g ~ ~ l a t l q system i s prokahly a t f a ~ ~ l t , c . I f t h ~ trouble 95 i so lated t o t h e voltage rcpuf a t i n g system, re-check the interconnection d i agrans, tigurcs 3-2 and 3-3. 4:most a1 1 para1 lel i n g problems entolrqt~red w i t h C,nCE? voltage regulators are caused by incorrect system intercannections.

SECTION 6.0

MAINTEHANCE, REPLACEMENT PARTS,

AND TROUBLESHOOTiNG

6.1 PREVENTIVE MAINTENANCE

A perlodic inspection should be made t o Insure t h a t the u n i t i s k e p t clean and free frm excessive d i r t and moisture. Also, check connections between Ihe regulator and the r y z t ~ n .

6.2 CORRECTIVE MAINTENANCE

a. Repairs can be made on the regulator by fallo~lng t h e schematic diagram

(Figure 7-11 and tr-oubleshooting guide (Table 6-11. Repairs to t h e printed circuit board should no t be attmpted. Easler E l e c t r i c Company mainta ins a s tpck o f replacernen t parts and rep1 acemen t vol tag@ regulators.

NOTE

(11 If, wben troubleshooting a generating system, a defectivg vo l tage regula"r Ir found, do n o t i n s t a l l a rep1 acement regulator without first measuring the dc res is tance o f the exciter =icld winding to insure t h a t the resistarlce is above the minimum spec i f l ed In T a b l e 1-1 for , t h a t regut a t o r model.

( 2 ) On generating systems not using a pawcr lsolaticn ttansfomt?r, or using a power F s o l a t l a n transformer w i t h a grouqded secondary, insure t h a t the excl ter f i @ l d winding or t i r c u i t ry i r not grounded beforcl ifistall inq a new val tag@ r~gulator.

6.3 WARRANTY AND REPAIR SERVICE

Thcse Baslcr E l e c t r i c voltage regul a t o t s are warranted a g a i n s t d e f e c t i v e material and workmansh~p. A complete service center f s rnatntalned a t Basler E lectsic Cmpany, High1 and, I 1 l i n o i s . Prompt turnaround on warranty an6 nm-warranty r e p a i r s i s provided.

6.4 REPLACEMENT PARTS

Table 6-2 contains parts and assemblfes which are maintenance sjgnificant.

Wherl orderlng rep1 acemen t parts , always specify the cmp? ete model nurnher and s e r i a l number o f t h c voltage regulator.

r c l a l i a o s h i p betwesn

P r ? n e mvcr not ad just rhecstat .

5ensi ?g connect i or15 s ~ t Connect t o correct t a p .

t o wroriq vul ta : je t ap .

Bsstw Electric H ~ ~ h l d . < I M J S

TABLE 6-1 - Trm~bleshaot ing C h a r t {Cor!tinued)

Replace S C R ' s o r a d j u s t rheostat .

( R 1 4 ) s e t too h i g i , Poor regulation.

fc rcnt locatioq t h 3 n s a m ~ m i n t a s reqglatw-p o s i t i o n , exceat d u r i n g para1 ley aperatiort.

U R ~ t averages a11 t h r p p

TABLE 6-1 - T r o ~ ~ b l eshoot i n q C h a r t ( c o n t i nueb) f a u l t i n exciter or powc r sens i ng governor.

TARLf 6-1 - TruuSl eshoot i ng Chart ( C o o t i n&d) can bc a b t a i n d f o r ?a ral lcl gcncrators .

Barallcl C T dons n o t 5ee s e c t i o n 5.0.

Place rwitch i n P a r a l l e l load equally. ( C i r - Uni :-Pa r a l lel mi tch.

c g i a t i n y r e a c t i v e currcnks between gen-

RdO s e t Im droop f i d j m t f o r in cress^

P a r n \ \ e l CT docs n o t P I acc w i t h proper CT [See sect ion 5,0).

change CT s ~ c o n d a t y

TABLE 6-2 - Replacemcat P a r t s L i s t

EM1 Fi l ter hssmbly (FL1) 90 597158 101 93 597% 101

Sensing Transformer RE 303N 0% 9E 00303 005 Sing le Phase ( T I )

Sensi ng T r a n s f o m c r RE 00310 0% BE 0'3310 OW Three Phase { T I and T2$

Para1 lel i ng T r a n s f o m r (T3) RE 10351 003 9F: 13351 003

T r d n s f o m r (TS) RE 10365 DOT RE 10355 OM

Filter Choke ( L 1 ) RE OR79d 092 RE 04794 012 lrliode (CR34, C A 3 5 , CR36, CR37, Silicon Controlled R e c t i f i e r (C532 and C R 3 3 )

FUSE {Fll, F12 and F13 )

T'lermal Swi t ch (53)

P a r a l lel i ng Rheostat (940)

External Voltage Ad just P. heosta t

Capac i to r tC30 and C31)

SECTION 7.0

DRAWINGS

7.1 GENERAL

The Col l o w i n g drawings are p r o v j d ~ d a s a i d to maintenance.

Slggre 7-1. Cmponent toca t i n o Figure 7-2. Schcnat i c D i a g r a m F i g u w 7-3. Wiring Diagram f i gure 7- 1. Ccmponen t Location

Figure 7-2. Schematic Diagram