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Sequence of Operation for the UB Substation

Loss of Utility 1 and 2:

1. PM-1 and PM-2 breaer open respecti!ely

a. "ie breaer P"-1 closes and P"-2 re#ains closed

2. $#er%ency %enerators start &Life Safety' (ithin 1) seconds

a. *enerator breaers and ties close

+. $#er%ency %enerator furnishes po(er to the UB until $quip#ent *enerators

co#e on-line.

,. UB-L closes and UB- opens

. UB tie re#ains closed

/. 0P1 and 0P2 "S controller3s transfers fro# preferred source to e#er%ency

source upon the loss of utility the preferred source &utility or equip#ent

%enerator'.

4. $quip#ent %enerators start &Le%ally Optional' (ithin /) seconds

5. Upon closin% the breaers for the $quip#ent %enerators6 UB- or &0P1 and

0P2' senses preferred po(er has returned6 UB-L opens and UB- closes6 the

0P1 and 0P2 transfer fro# e#er%ency to preferred po(er &utility or

equip#ent %enerator'.

7. $#er%ency %enerators re#ain runnin% until stable po(er is indicated on

PM8S or ti#e delay e9pires and a si%nal is sent for the e#er%ency %enerators

to shut do(n.

1).Upon the return of utility to PS-26 the equip#ent %enerators breaers (ill

open upon the e9piration of the #in ti#e delay stabiliation of the utility.

11.Once the si%nal is recei!ed that utility is stable6 the PS-2 #ain breaer (ill

close and the equip#ent %enerator breaers (ill open.

12."he 0P1 and 0P2 should re#ain on preferred source &equip#ent

%enerators' until utility po(er is stable.

7/17/2019 Sequence of Operation for the UB Substation

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Per e-mail 06.12.2015

;ual Utility Outa%e:

1. PM-1 and PM-2 breaer open respecti!ely

a. "ie breaer P"-1 re#ains open and P"-2 re#ains closed

2. $#er%ency %enerators start &Life Safety' and supports loads (ithin 1)

seconds

+. $#er%ency %enerator furnishes po(er to the UB-L.

a. UB- opens6 UB-L closes

b. UB tie re#ains closed

,. 0P1 and 0P2 "S controller3s transfer fro# preferred source &S1' to

alternate source&S2' upon proof of !olta%e at S2. UB-L feeds S2 and S1 under

this con<%uration. ;oes 0P-1 return to S1= > thin so6 after + seconds. 0P-2

ne!er sees S1 e9cept (hen fed fro# UB-. [Smolinski] yes, FP-1 should

return to the preferred source (S1).

. $quip#ent %enerators start &Le%ally Optional' (ithin /) seconds

/. Upon closin% the breaers for the $quip#ent %enerators6 UB- or &0P1 and

0P2' senses preferred po(er has returned6 UB-L opens and UB- closes.

 "ie re#ains closed. 0P-1 S1 and 0P-2 S1 recei!e po(er fro# UB-. 0P-1 S2

recei!es po(er fro# the circuit feedin% UB-L (ith UB-L #ain open.

 [Smolinski] yes, FP-1 !S should stay "ith the preferred source S1

no" fed from #$-%.

eturn to Sin%le Utility &PS-1 ? ;erbi%ny':

1. $quip#ent syste# de-ener%ies PS-1 bus after <!e #inute ti#e delay6 PS-1

#ain closes6 tie re#ains open. Upon the return of utility to PS-26 the

equip#ent %enerators breaers (ill open upon the e9piration of the #in

utility stabiliation ti#e delay.

2.  $quip#ent Syste# de-ener%ies PS-2 bus6 tie-closes.

+.  UB- de-ener%ies durin% transfer bac to utility6 UB-L closes. 0P-1 s(aps

bac to S2.

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,.  UB- senses po(er re-established fro# PS-26 UB-L #ain opens6 UB- closes.

0P-1 S1 and 0P-2 S1 are fed fro# UB-. [Smolinski] &es, and FP-2, S2 is

also a'ailale ut, s"itch stays "ith preferred source S1.

. $#er%ency %enerators re#ain runnin% until stable utility po(er ti#er e9pires

on both utilities &(ith no resets' and a si%nal is sent for the e#er%ency%enerators to shut do(n. 0P-1 S2 de-ener%ies (hen ser!ice to e#er%ency

syste# bus is opened.

eturn to ;ouble Utility

1. Once the si%nal is recei!ed that PS-2 utility is stable6 the tie (ill open6 PS-2

#ain (ill close.

2. UB- (ill lose po(er durin% transition6 0P-1 (ill s(itch to S2. UB-L (ill close.

&ti#e delays needed='

+. UB- (ill be re-fed fro# PS-26 UB-L (ill open6 UB- (ill close. 0P-1 S1 and 0P-

2 S1 (ill be supported and (ill transition as required.  [Smolinski] &es, and

FP-2, S2 is also a'ailale ut, s"itch stays "ith preferred source S1.

,. $#er%ency syste# (ill shut do(n upon co#pletion of <!e #inute utility

stability ti#e delay.

%oert Smolinsi*

+oes Sustation #$ e'er no" "hether #$-% source is ntery or

enerator and does it care See additional comments elo"/

 im !hornton*

Right now, no, UBS has no way of knowing what is feeding UB-R. It sees voltage, it will start

transition process.

Please send this to Ned Simon with yor seal of approval, if it!s good to go. "e need UBS P#$

pdated this weekend to test %efore the drop test.