TECHNICAL AND

COMMISSIONNING r~ANUAL

R E c 7 O

cos ATOMATIC SYNCHRONISER

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MAINTENANCE

.MENSION~

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WIRING

CONTENTS

PSM70/1243/1

.

CEGElEC

OBJECT

The COS coupling unit is designed to enable or to transmit a closing

order to a circuit-breaker separating two sources or between main

supply and user networks when the conditions specified by the user are

fulfilled.

Two operating modes are possible as indicated below :

A -Svnchronization monitoring

theA contactfulfilled :

is closed when following three conditions are

frequency deviation ~ F < ~ F max Maximum frequency deviation

voltage deviation [1 u < [1 u max Maximum voltage deviation

'f < ~ max Maximum phase-displacementdephasing

Exarnoles of use :

Validation of manual coupling of an alternator

Validation of circuit-breaker operations in industrial networks

where several power sources exist.

Rapid transfer systems

B -Svnchronization

When operating in this mode, a contact closes with a lead time TA,

equivalent to the closure time of the circuit-breaker, before the

in phase period. The coupling operation is done perfectly in phase.

Examoles of use

Automatic synchronizing of a low power alternator

.Synchronizer SCSI, CSI, SCUSI and UCSI are more suitable for use

with medium and high power alternators.

PSMlO/1243/2

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CEGElEC

OPERATING PRINCIPLES2

2.1

~~loJJ

rN~

PSM70/1243/3

nna)~

b666...tLJ"\-or-

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CEGELEC

2.2 ANALYSIS OF DIAGRAM

-Power suoolv sources

The two AC input voltages provide a direct current supply through

two transformers and two floating rectifiers.

A voltage regulator supplies the stabilized power required

(- 6V + 9 V + 15 V} for the various circuits.

2 -Measurements

Voltaae deviation IA ul

The two power transformers also supply the 2 voltage measurements

which are rectified~filtered and compared. The comparison is

therefore made between mean values which are proportional to RMS

values if the voltages are sinusoïdal: a second rectifier gives

the absolute I~ U/ after comparison.

Phase d;sDlacement~

The 2 voltages taken on the same transformers as above are adjusted

to give square signals A' and R'. A' and R' are applied to an

"exclusive OR" followed .by a 4 th. sequence filter giving Ifl.

s--Ln--JL~AI

~~~

R'

A I + R~UT1J--uLL

l'fl

PSMlO/1243/4

.

CEGELEC

freauencv deviatiQll

dt

3 -Ibreshold~

I~ U/ < ~ u max

I ~ I < f max

16 FI < 6 F max

4 -Advance time 1.8

/

dt

..As the frequency deviation can be

considered constant in the relevant

time interval, we may write :

dlff = -kt .

)

I

IrA I

I I

-k=

dt

TA = -ÀAt point A: -kTA -À K = O

PSMlO/1243/5

6F = k

.

CEGELEC

5 -~eauent ili

either a

6 -Protect i OJl

The signal obtained is

6u-

u

A -R

A

~u--

u

By writing : = R = A (1 -)

The equation becomes :

~u

s i n wtu

sinu)A -(JJRLùA + <.ùR~u

--

u

D = A [2. Cos -t xt +

--

sin~Rt]2 2Llu

-

u

"1'D = A (2 Cos l.ùtSin -+ s i n I..J.)t }

~

Â

2A "

.A.~u

~.

(for = O)

and Ll u < 50 %u

for'f= O)

PSMlO/1243/6

$1 n -!-- and .

2 uThe protection function$ for :

~u~ < 40°

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CEGELEC

FUNCTIONAL CHARACTERISTICS3

(((((

4 )5 )

.InRut voltages :

110 V 110 V or 220 Vat l 20%

A6 )7 )

110 V 6 VA, 48/62 Hz

IB (

(

I

110 V 110 V or 220 Vat ! 20 %

110 V 6 VA, 48/62 Hz

)))))

Outout relavs : 23

220 V 2 A 150 VA(( F.D

127 V2

l

1 A 50 WP.R

(Fit surge arresters at terminals of commanded relays or breaker

Oielectric rigidit~ : Between AI RI Output contactsl Earth

2000 V 50 Hz 1 mn I 100 M(tat 500 V OC

CEI 255-5.ANSI IEEE C 37-90-1978

Climatic conditions: Operation : -5° C + 50° C

Storage : -25° C + 70° C

~ F max

~ u max

~ max

TA

Ad.iustment range :

~ F < ~ F max6 u < u max'f < 'f max

TA

! (0,05 Hz + 10% ~ F max)

! (2% + 10% ~ U max)

! (2° + 10% max)

! (20 ms + 10% TA)

Precision :

PSMlO/1243/l

89

10Il

0,1 ta 0,75 Hz

2 ta 30 %

2 ta 30°

20 ta 300 ms

.

CEGELEC

4 WIRING

.+ ,-- -t--

f--

f--

"Oc~o...

\.:J

>o......

>o:::

>o::

>c::

...~ ...c.w

...'g~ ...

o o

~~

c a:

USE WITH 100 V -110 V OR 115 V VOLTAGE TRANSFORMERS

Utilisation ranae 88 V to 132 V

f]1 rrc~t bre.tr

PSM70/1243/8

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CEGELEC

Note 1 :

The COS can f necessary remain permanently connected.

NoteZ :

Note 3 : If the circuit-breaker switch coil

intermediate relayas necessary.is too powerful, use an

PSMlO/1243/9

.

CEGElEC

WIRING SHEME FOR A SYNCHRONIZING UNIT WITHOUT VOLTAGE EOUALISATION

Utilisation voltaqe 88 V to 132 V (VT : 100 V. 110 V or 115 V)

WIRING OF A SYNCHRONIZING UNIT WITHOUT EOUALISATION OF VOLTAGE

Utilisation voltage from 176 V to 264 V (VT 200 V. 220 V)

.

CEGElEC

WIRING OF A SYNCHRONIZING UNIT WITH VOLTAGE EOUALISATION

Utilisation voltaqe 88 V to 132 V ( VT 100 V. 110 V or 115 V}

sYS(OS

r6T

EuT

7'.1,1~1"\12 2 314\51 ,~ 7~.j9110~11112 2 ~ 32131 4' S , 1 4\SI'\7\11',-lnlt'1

,

~tRr

Reliy or switch

of put tinginto service 111

~81

>-81,.o.

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~tl

>-tl..o.

-~tl

~ I

...

~

..

.5'"

.ku

.,~~

..-

-0a->

..~

~~~-

.o~ >l'-'

WIRING FOR A SYNCHRONIZING UNIT WITH VOLTAGE EOUALISATION

Utilisation voltaae 176 V to 264 V (VT 200 V. 220 V)

sYScos EuT

21 3'~1 S2~]1~, 5' "7 .~ 9 11Ojnl12 213~~ S~6 ~1 .1'11O("~12J 1 1

'"-,

..:t-~tI-~

Reliy or switch.of put tingI1to service 11)

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PSMlO/1243/11

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MlO

/1243/12

AB

Dept

.

CEGElEC

6 COMMISSIONING

A. Before put ting into operation, inhibit output order

B Check that the wiring and voltage levels are suitable for the

unit i.e. 110 V or 220 Vat + or -20 %.

c Adjust parameters lf max) ~ U max) ~ F max and if applicable TA

if the synchranizing j when TA is used set ~max ta maximum 30°,

~ To adjust, use the small sw;tches oppos;te each of wh;ch

;s a value. The set value corresponds to the ~ of the

4 values selected by push;ng forward the cursors towards

the frames where these values are ;nscr;bed.

ExamDle

Coupling

,

0,15 Hz

t

I-I.

t

Synchronisation

monitoring

,20. t

O,2SHzt18.1.15 not tiktn

into iCCOOOt

nilinoperitivt

For autornatic coupling of an alternator, the advance tirne TA rnust be

QigQ, by depressing the EN switch and set ting ~rnaxto 30:,-

Adjust TA sa that it equals the clasing time of the circuit-breaker

switch and the assaciated relays (ta within approximately 20 ms).

Then adjust ~ F max and ~

synchronizing conditions.

u max a function of the requiredas

PSMlO/1243/13

30°

(compulsoryl

.

CEGELEC

D.

E

If there is no wiring error,

phase voltages.the coupler wil be powered by

F

7MAINTENANCE --

PSMlO/1243/14