26 05 73.pdf

137TH SOW OKLAHOMA ANG B- 3 100% REPAI R BUI LDI NG 1040

OKLAHOMA CI TY, OK 12 SEPTEMBER, 2024

SECTI ON 26 05 73

POWER SYSTEM STUDI ES

08/ 23

PART 1 GENERAL

1. 1 REFERENCES

The publ i cat i ons l i s t ed bel ow f or m a par t of t hi s speci f i cat i on t o t he ext ent r ef er enced. The publ i cat i ons ar e r ef er r ed t o wi t hi n t he t ext by t he basi c desi gnat i on onl y.

I NSTI TUTE OF ELECTRI CAL AND ELECTRONI CS ENGI NEERS ( I EEE)

I EEE 1584 ( 2018; E 2019) Gui de f or Per f or mi ng Ar c- Fl ash Hazar d Cal cul at i ons

I EEE 1584. 1 ( 2022) Gui de f or t he Speci f i cat i on of Scope and Del i ver abl e Requi r ement s f or an Ar c- Fl ash Hazar d Cal cul at i on St udy

I EEE 3002. 2 ( 2018) Recommended Pr act i ce f or Conduct i ng Load- Fl ow St udi es and Anal ysi s of I ndust r i al and Commer ci al Power Syst ems

I EEE 3002. 3 ( 2018) Recommended Pr act i ce f or Conduct i ng Shor t - Ci r cui t St udi es and Anal ysi s of I ndust r i al and Commer ci al Power Syst ems

I EEE C2 ( 2023) Nat i onal El ect r i cal Saf et y Code

NATI ONAL FI RE PROTECTI ON ASSOCI ATI ON ( NFPA)

NFPA 70E ( 2024) St andar d f or El ect r i cal Saf et y i n t he Wor kpl ace

U. S. DEPARTMENT OF DEFENSE ( DOD)

UFC 3- 560- 01 ( 2017; wi t h Change 3, 2023) Oper at i on and Mai nt enance: El ect r i cal Saf et y

1. 2 SYSTEM DESCRI PTI ON

The power syst em cover ed by t hi s speci f i cat i on consi st s of : Exi st i ng pad- mount t r ansf or mer , 480/ 277V di st r i but i on syst em wi t h exi st i ng and new panel boar ds and st ep down t r ansf or mer s. 208/ 120V di st r i but i on syst ems wi t h exi st i ng and new panel boar ds. .

1. 3 SUBMI TTALS

Gover nment appr oval i s r equi r ed f or submi t t al s wi t h a " G" c l assi f i cat i on.

Submi t t al s not havi ng a " G" c l assi f i cat i on ar e f or Cont r act or Qual i t y Cont r ol appr oval . Submi t t al s wi t h an " S" ar e f or i ncl usi on i n t he Sust ai nabi l i t y Not ebook, i n conf or mance t o sect i on 01 33 29 SUSTAI NABI LI TY REPORTI NG. Submi t t he f ol l owi ng i n accor dance wi t h Sect i on 01 33 00

SUBMI TTAL PROCEDURES:

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Gallagher, Brad K.

Text Box

ADDENDUM #1 - 02/17/2025

Gallagher, Brad K.

Cloud

SD- 01 Pr econst r uct i on Submi t t al s

Fi el d Exami nat i on Pl an; G, Ar c Fl ash Label For mat s; G, SD- 06 Test Repor t s

Fi el d Exami nat i on

SD- 07 Cer t i f i cat es

Syst em Anal yzer ; G, SD- 11 Cl oseout Submi t t al s

Model Fi l es; G, Load Fl ow St udy; G, Faul t Cur r ent St udy; G, Syst em Coor di nat i on St udy; G, Ar c Fl ash Hazar d St udy; G,

1. 4 QUALI TY ASSURANCE

1. 4. 1 Syst em Anal yzer

The Syst em Anal yzer must per f or m t he power syst em st udi es. The Syst em Anal yzer must be a r egi st er ed pr of essi onal el ect r i cal engi neer wi t h a mi ni mum of 3 year s of exper i ence wi t h power syst em st udi es. I ncl ude a l i s t of t hr ee compar abl e j obs per f or med by t he Syst em Anal yzer wi t h speci f i c names and t el ephone number s f or r ef er ence. I ncl ude t he l i cense number and st at e of t he r egi st er ed Pr of essi onal Engi neer .

1. 4. 2 Syst em Ver i f i er

The Syst em Ver i f i er may i nspect and r ecor d set t i ngs, mar ki ngs, and ot her wi se document t he exi st i ng equi pment . The Syst em Ver i f i er may al so pl ace appr opr i at e hazar d l abel s on equi pment . The Syst em Ver i f i er must not make any cal i br at i ons or adj ust ment s or pl ace equi pment i nt o ser vi ce.

When wor ki ng wi t h ener gi zed equi pment , t he syst em ver i f i er must be a Qual i f i ed Per son per NFPA 70E or wor ki ng under t he di r ect super vi s i on of a Qual i f i ed Per son. The Syst em Ver i f i er may communi cat e wi t h t he syst em owner t o det er mi ne i f t he equi pment wi t hi n t he st udi ed syst em has r ecei ved mai nt enance and t est i ng i n accor dance wi t h NETA MTS or NFPA 70B.

PART 2 PRODUCTS

Not used.

PART 3 EXECUTI ON

3. 1 FI ELD EXAMI NATI ON

For each pr e- and post - st udy i nspect i on, submi t a f i el d exami nat i on pl an i dent i f y i ng whi ch f aci l i t i es must be exami ned t o compl et e t he r equi r ed

SECTI ON 26 05 73 Page 2 wor k. I ncl ude a compl et e i nf or mat i on ver i f i cat i on pr ocedur e, wher e Qual i f i ed Per sonnel wi l l be r equi r ed, PPE r equi r ement s f or " l i ve" equi pment exami nat i ons, and equi pment t o be used wi t hi n t he l i mi t ed appr oach boundar y of t he equi pment .

3. 1. 1 Gener al

Per f or m f i el d i nspect i ons of t he s i t e and equi pment bef or e t he f i r st st udy and af t er t he l ast st udy t o det er mi ne t he st at e and set t i ngs of t he equi pment and t o ver i f y t he f i nal set t i ngs agr ee wi t h t he st udi es.

Per f or m t he post - st udy i nspect i on( s) af t er changi ng set t i ngs, af t er per f or mi ng accept ance t est s, and bef or e pl aci ng equi pment i n ser vi ce.

Schedul e t he f i el d exami nat i on by t he Syst em Ver i f i er wi t h t he Cont r act i ng Of f i cer at l east 10 busi ness days bef or e conduct i ng exami nat i on. Fur ni sh al l mat er i al s, l abor , and equi pment necessar y t o conduct t he exami nat i on.

Mai nt ai n a wr i t t en r ecor d of t he al l equi pment exami ned, equi pment l ocat i on, equi pment r at i ngs, set t i ngs, per sonnel i nvol ved, and t he dat e t he exami nat i on was per f or med. Submi t t he wr i t t en r ecor d of each f i el d exami nat i on.

3. 1. 2 Saf et y

Wher e exami nat i on of t he equi pment r equi r es ener gi zed equi pment t o be opened, pr ovi de a Qual i f i ed Per son t o di r ect l y super vi s i ng any non- Qual i f i ed Per son wi t hi n t he hazar d ar ea. Use PPE, pr ot ect i ve bar r i er s, danger s i gns and ot her saf et y devi ces t o pr ot ect and war n per sonnel i n t he v i c i ni t y of " l i ve" equi pment bei ng exami ned.

3. 1. 3 Appl i cat i on of Ar c Fl ash Label s

I nst al l ar c f l ash war ni ng l abel s usi ng Qual i f i ed Per sonnel as necessar y af t er t he set t i ng and i nspect i on i s compl et e. For new or modi f i ed equi pment , i nst al l l abel s bef or e t he equi pment i s ener gi zed f or t he f i r st t i me af t er i nst al l at i on/ modi f i cat i on or set t i ng changes. Schedul e t he l abel pl acement wi t h t he Cont r act i ng Of f i cer at l east 5 busi ness days bef or e l abel pl acement . Fur ni sh al l mat er i al s, l abor , and equi pment necessar y t o pl ace t he l abel s. Mai nt ai n a wr i t t en r ecor d of t he al l equi pment t hat r ecei ved l abel s, per sonnel i nvol ved, and t he dat e l abel s wer e pl aced.

3. 2 POWER SYSTEM STUDI ES

Per f or m power syst em st udi es t o demonst r at e t hat t he equi pment sel ect ed and syst em const r uct ed meet t he cont r act r equi r ement s f or f aul t cur r ent and i nt er r upt r at i ngs, coor di nat i on, pr ot ect i on, and Ar c Fl ash Hazar d.

Submi t r epor t s of t he st udi es al ong wi t h pr ot ect i ve devi ce equi pment submi t t al s. Appl y Ar c Fl ash Hazar d l abel s t o equi pment af t er t he st udi es ar e appr oved. Updat e and r esubmi t t he st udi es af t er any changes t o t he equi pment or syst ems whi ch may af f ect t he st udy r esul t s, and r e- appl y Ar c Fl ash Hazar d l abel s t o equi pment af t er t he r esubmi t t ed st udi es ar e appr oved. The Gover nment i s not r esponsi bl e f or any changes t o equi pment , devi ce r at i ngs, set t i ngs, or addi t i onal l abor f or i nst al l at i on of equi pment or devi ces or l abel s or der ed and/ or pr ocur ed bef or e appr oval of t he st udy.

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3. 2. 1 Scope of St udi es

The scope of t he st udi es must begi n at t he near est upst r eam devi ce i n t he exi st i ng sour ce syst em and ext end t hr ough t he downst r eam devi ces at t he l oad end.

The " sour ce bus" i s t he sour ce of ener gy f or syst em bei ng anal yzed. Thi s may be t he ener gy f eed f r om a ut i l i t y , t he f i r st bus upst r eam of t he wor k, gener at or s wi t hi n t he wor k or upst r eam of t he wor k, or any ot her sour ce capabl e of cont r i but i ng s i gni f i cant ener gy i nt o t he syst em bei ng anal yzed.

I n t he syst ems model f or t he st udi es, i ncor por at e al l exi st i ng and new equi pment wi t hi n t he scope of t he st udi es. I ncor por at e any addi t i onal sour ces or l oad equi pment necessar y t o accur at el y model t he syst em' s per f or mance.

Wher e mul t i pl e sour ces of power may be i n ser vi ce i n var i ous combi nat i ons or wher e el ect r i cal l oops ar e i n t he syst em, i ncor por at e i nt o t he st udi es al l t he modes of oper at i on t o eval uat e t he i mpact of t he modes of oper at i on on t he syst em. The pr i mar y modes of oper at i on ar e l i s t ed bel ow.

1. Nor mal oper at i on

2. Emer gency Gener at or Oper at i on

3. 2. 2 Det er mi nat i on of Fact s

Det er mi ne and document t he t i me- cur r ent char act er i st i cs, f eat ur es, r at i ngs, ampaci t i es, and namepl at e dat a f or each exi st i ng pr ot ect i ve devi ce, el ect r i cal equi pment , and f eeder cabl es. Obt ai n t he avai l abl e f aul t cur r ent f r om t he owner of t he sour ce bus. For mul t i pl e modes of oper at i on, use t he mode wi t h avai l abl e f aul t cur r ent t hat pr oduces t he gr eat est i nci dent ener gi es i n t he ar c f l ash hazar d st udy.

Ut i l i ze f i el d- ver i f i ed dat a i n t he power syst em st udi es. Document t he f i el d- ver i f i ed dat a i n t he r epor t .

3. 2. 3 Si ngl e Li ne Di agr am

Pr ovi de a s i ngl e l i ne di agr am showi ng t he el ect r i cal syst em buses, devi ces, t r ansf or mat i on poi nt s, and al l sour ces of l oad cur r ent and f aul t cur r ent , i ncl udi ng gener at or and mot or cont r i but i ons. Pr ovi de a di agr am f r om t he syst em model . Each bus, devi ce or t r ansf or mat i on poi nt must have a uni que i dent i f i er . Show t he l ocat i on of swi t ches, br eaker s, and ci r cui t i nt er r upt i ng devi ces on t he di agr am t oget her wi t h avai l abl e f aul t dat a, and t he devi ce i nt er r upt i ng r at i ng.

The nami ng of exi st i ng component s wi t hi n t he syst em model and si ngl e l i ne di agr am must mat ch exi st i ng i nst al l ed equi pment names. The nami ng of new component s wi t hi n t he syst em model and si ngl e l i ne di agr am must use uni que i dent i f i er s and be coor di nat ed wi t h t he Gover nment .

3. 2. 4 Load Fl ow St udy

Per f or m t he l oad f l ow st udy i n accor dance wi t h I EEE 3002. 2 t o i dent i f y i ni t i t al st eady- st at e condi t i ons f or t he f aul t cur r ent st udy. For each

SECTI ON 26 05 73 Page 4 oper at i ng scenar i o, pr ovi de l oad f l ow r esul t s on t he di agr am or i n t he r epor t . Show or descr i be t he l oadi ng f act or s and assumpt i ons used i n each oper at i ng mode.

3. 2. 5 Faul t Cur r ent St udy

Use t he r esul t s of t he l oad f l ow st udy t o per f or m t he f aul t cur r ent st udy i n accor dance wi t h I EEE 3002. 3. Pr ovi de bal anced t hr ee- phase f aul t , bol t ed l i ne- t o- l i ne f aul t , and si ngl e l i ne- t o- gr ound f aul t cur r ent val ues at each vol t age t r ansf or mat i on poi nt and at each power di st r i but i on bus.

For each l ocat i on, show i n t abul ar f or m on t he di agr am or i n t he r epor t t he maxi mum and mi ni mum avai l abl e f aul t cur r ent s of al l modes of oper at i on f or t hat l ocat i on.

Wher e t he avai l abl e f aul t cur r ent at t he sour ce bus i s not avai l abl e, descr i be how t he f aul t cont r i but i on f r om t he sour ce bus was det er mi ned and why t hi s met hod i s r easonabl e f or t he st udy.

3. 2. 6 Syst em Coor di nat i on St udy

Use t he r esul t s of t he l oad f l ow st udy and f aul t cur r ent st udy. For nor mal modes of oper at i on, demonst r at e t hat sel ect i v i t y has been obt ai ned bet ween t he devi ces wi t hi n t he scope of t he pr oj ect . Demonst r at e t he equi pment , machi nes, and conduct or s ar e pr ot ect ed f r om damage f r om over l oads and f aul t condi t i ons. I ncl ude a descr i pt i on of t he coor di nat i on of t he pr ot ect i ve devi ces i n t hi s pr oj ect . Pr ovi de a wr i t t en nar r at i ve descr i bi ng whi ch devi ces may oper at e i n t he event of a f aul t at each bus;

t he l ogi c used t o ar r i ve at devi ce r at i ngs and set t i ngs; s i t uat i ons wher e syst em coor di nat i on i s not achi evabl e due t o devi ce l i mi t at i ons;

coor di nat i on bet ween upst r eam and downst r eam devi ces; and r el ay set t i ngs.

Pr ovi de r ecommendat i ons t o i mpr ove or enhance syst em r el i abi l i t y , and det ai l wher e such changes woul d i nvol ve addi t i ons or modi f i cat i ons t o t he cont r act and cost damages ( addi t i on or r educt i on) . Pr ovi de composi t e coor di nat i on pl ot s on a l og- l og scal e. Wher e r ecommendat i ons ar e pr ovi ded t o i mpr ove or enhance syst em r el i abi l i t y , pr ovi de separ at e coor di nat i on pl ot s on l og- l og scal e showi ng t he syst em coor di nat i on bef or e and af t er t he i mpl ement at i on of t he r ecommendat i ons. Wher e coor di nat i on has been adj ust ed t o l ower ar c f l ash val ues, i ncl ude a di scussi on of t he change and t he i mpact on t he syst em wi t hi n t he r epor t .

3. 2. 7 Ar c Fl ash Hazar d St udy

Per f or m t he ar c f l ash hazar d st udy i n accor dance wi t h I EEE 1584. 1.

Ut i l i ze t he dat a f r om t he f aul t cur r ent st udy t o det er mi ne t he wor st case i nci dent ener gy per I EEE 1584, I EEE C2, and OSHA 29 CFR 1910. 269 Appendi x E. Use i dent i f i ed modes of oper at i on t o det er mi ne t he wor st case ar c f l ash ener gy. I f not i ncl uded i n anot her st udy, i ncl ude a descr i pt i on of t he devi ces and devi ce set t i ngs f or t he oper at i ng modes t hat pr ovi ded t he hi ghest ar c f l ash ener gy. Wher e t he adj ust i ng t he coor di nat i on of devi ces t o obt ai n l ower ar c f l ash val ues, i ncl ude a di scussi on of t he change and t he i mpact on t he syst em wi t hi n t he r epor t . .

Wher e t he AC syst em vol t age i s 208 vol t s or l ess wi t h an avai l abl e shor t - c i r cui t cur r ent l ess t han 2000 A, an ar c f l ash hazar d st udy i s not r equi r ed.

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3. 2. 8 St udy r epor t ( s)

a. I ncl ude a nar r at i ve descr i bi ng t he st udi es per f or med; t he bases and met hods used; and t he desi r ed met hod of coor di nat ed pr ot ect i on of t he power syst em.

b. I ncl ude descr i pt i ve and t echni cal dat a f or exi st i ng devi ces and new pr ot ect i ve devi ces pr oposed. I ncl ude manuf act ur er s publ i shed dat a, namepl at e dat a, and def i ni t i on of t he f i xed or adj ust abl e f eat ur es of t he exi st i ng or new pr ot ect i ve devi ces. For exi st i ng devi ces, i ncl uded st at ement s on t he condi t i on of t he equi pment based upon f i el d i nspect i ons and owner ' s st at ement s and r epor t s.

c. Document ut i l i t y company dat a i ncl udi ng syst em vol t ages, f aul t MVA, syst em X/ R r at i o, t i me- cur r ent char act er i st i c cur ves, cur r ent t r ansf or mer r at i os, and r el ay devi ce number s and set t i ngs; gener at or r esi st ance and r eact ance val ues, and t i me const ant s; and exi st i ng power syst em dat a i ncl udi ng t i me- cur r ent char act er i st i c cur ves and pr ot ect i ve devi ce r at i ngs and set t i ngs. I dent i f y al l assumpt i ons about t he pr ot ect i on devi ces, equi pment , and syst em wher e dat a was not avai l abl e.

d. For each bus i n t he syst em, pr ovi de f ul l y coor di nat ed composi t e t i me- cur r ent char act er i st i cs ( TCC) cur ves as r equi r ed t o ensur e coor di nat ed power syst em pr ot ect i on bet ween pr ot ect i ve devi ces and equi pment . I n a t abul ar f or mat , pr ovi de exi st i ng and r ecommended r at i ngs and set t i ngs of al l pr ot ect i ve devi ces.

e. Pr ovi de an ar c f l ash st udy r epor t i n accor dance wi t h I EEE 1584. 1.

f . Pr ovi de t he cal cul at i ons per f or med f or t he st udi es, i ncl udi ng comput er pr ogr ams ut i l i zed. Pr ovi de t he name of t he sof t war e package, devel oper , and ver si on number .

f . The Syst em Anal yzer must st amp t he st udy r epor t s.

3. 2. 9 Ar c Fl ash Label s

Pr ovi de ar c f l ash war ni ng l abel s on el ect r i cal equi pment l i kel y t o r equi r e exami nat i on, ser vi c i ng, or mai nt enance whi l e ener gi zed. Typi cal t ypes of equi pment i ncl ude pad- mount ed t r ansf or mer s, swi t chgear , swi t chboar ds, panel boar ds, di sconnect swi t ches, i ndust r i al cont r ol panel s, met er socket encl osur es, and mot or cont r ol cent er s t hat ar e i n ot her t han dwel l i ng occupanci es. The ar c f l ash l abel nami ng must mat ch t he nami ng used i n t he syst em model i ng and t he si ngl e l i ne di agr am.

Compl y wi t h t he l abel r equi r ement s speci f i ed i n UFC 3- 560- 01NFPA 70E.

Obt ai n appr oval of ar c f l ash l abel f or mat s bef or e pr i nt i ng.

a. Pr ovi de a 3. 5 i nch x 5 i nch t o 4 i nch x 6 i nch t her mal t r ansf er t ype l abel of hi gh adhesi on pol yest er f or each l ocat i on devi ce anal yzed.

The l abel must r emai n i n pl ace and be l egi bl e f or at l east 5 year s i n t he i nst al l ed envi r onment .

b. Label s must be machi ne pr i nt ed wi t h no f i el d mar ki ngs. Pr ovi de ar c f l ash l abel s i n t he f ol l owi ng manner . Al l l abel s must be based on i mpl ement ed over cur r ent devi ces and set t i ngs.

1. Pr ovi de at l east one ar c f l ash l abel f or each 480 vol t and 208 vol t

SECTI ON 26 05 73 Page 6 panel boar ds.

2. Pr ovi de at l east one ar c f l ash l abel f or each l ow vol t age ( l ess t han 1000 V) swi t chboar d.

3. Wher e t he equi pment const r uct i on has di f f er ent hazar ds l evel s i n di f f er ent ar eas, pr ovi de a s i ngl e l abel r epr esent i ng t he wor st case hazar d f or al l br anch ci r cui t s and a separ at e uni que l abel f or t he compar t ment cont ai ni ng t he mai n pr ot ect i ve devi ce. On t he wor st case l abel , i ndi cat e whi ch br anch ci r cui t compar t ment s have t he wor st case hazar d.

c. Use t he wor st case hazar d of al l oper at i ng scenar i os unl ess mi t i gat i on pr ocedur es ar e used. I f mi t i gat i on pr ocedur es ar e used, expl ai n t he pr ocedur es on t he l abel .

3. 3 MODELI NG

Devel op a sof t war e model of t he el ect r i cal syst em i dent i f i ed i n t he scope of t he st udi es. Use t he l at est ver si on of SKM Power Tool s( TM) . Devel op t he model wi t h accur at e, ver i f i ed i nf or mat i on. Model exi st i ng el ect r i cal equi pment , machi nes, devi ces, and conduct or s di r ect l y connect ed t o, al t er ed by, or ot her wi se af f ect ed by t he wor k. Thi s i ncl udes, but i s not l i mi t ed t o gener at or s, t r ansf or mer s, swi t chgear , swi t chboar ds, panel boar ds, mot or cont r ol cent er s, mot or s, vol t age r egul at or s, t ap changer s, pr ot ect i ve r el ays, c i r cui t br eaker s, swi t ches, f uses, conduct or s, capaci t or s, r eact or s, gr oundi ng syst em, and cont r ol equi pment .

Pr ovi de t he f i nal model f i l es i n t hei r nat i ve edi t abl e f or mat s f or f ut ur e use by t he Gover nment . I ncl ude devi ce i nf or mat i on f or devi ces not i n t he sof t war e vendor ' s st andar d di st r i but i on.

- - End of Sect i on - -

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3.3 MODELING