Lookout Brook Hydro Plant Refurbishment (Clustered), p. 4 of 96, $2,155,000
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1 Requests for nformation PUB-NP-6 NP 2010 CBA Lookout Brook Hydro Plant Refurbishment (Clustered), p. 4 of 96, $2,155,000 Q. n the report provided in Tab 1.2 Lookout Brook Hydro Plant Refurbishment, page 7, NP mentions arc flash zone of influence. f NP has investigated the extent of arc flash exposure in its facilities please provide the report that has been prepared. f not, please provide reasons why this investigation has not been undertaken. A. Newfoundland Power has not prepared a formal report on arc flash exposure for all of its facilities. Newfoundland Power has investigated the extent of arc flash exposure and completed arc flash hazard studies for all of its substation and hydro plant high voltage switchgear. Such studies are completed to current industry standards under the supervision of qualified professional engineers. Attachment A provides the arc flash study for Lookout Brook Plant. The arc flash zone of influence for the switchgear at Lookout Brook Plant is 633 inches or 16 metres. Newfoundland Power Capital Budget Application Page 1 of 1
2 Requests for nformation PUB-NP-6 Attachment A NP 2010 CBA Lookout Brook Arc Flash Hazard Study Newfoundland Power Capital Budget Application
3 ELECTRCAL ENGNEERNG ARCFLASHHAZARDSTUDY REASON FOR ARC FLASH HAZARD STUDY Arc Flash Hazard calculal ons to be done for all Metal Clad Swltrchgear Study revlslted after 403L. conversion.. from33;~ lo 66kV -- PONTS TO NOTE 1. PPE level class.. >4... at 16 ~nches (working :nside swilchgear), 2. PPE lgvei class 3 a1 36 inches (racking out breake!) - -
4 2.4kV 2.4kV LBK-T -Dl LBK-T -D2 LBK-01 -F N LL - OUTDOORS "1 ge- NDOORS LOCAL FEEDEF + & FOREBAY LNE 2ph Delta 2.4 kv 2.4kV 2.4kV LBK-G3-D LBK-PT-6-FD LBK-PT-6 LBK-PT-5-FD LW-PT-5 LBK-PT-3 LBK-S/S-0 LBK-PT-2 LBK-PT-1 S LBK-G3-B LBK-PT-2-FD --(,LBK-G~-GP PROTECTON -FD LBK-PT-1 SURGE LBK-PT-4-FO 1 LBK-PT-4 3OOOkVA 2889kVA 90% P.F. LBK-G3-DN Lorne W. - NEWFMlUDUWD ==k==== SNGLE LNE DAGRAM POWER A FORTS COMPANY PROMNCE - Of NEWWNDLAND PERMT HOLDER --r Dote: SWATURE hb Pnnn Urn LOOKOUT -- bw h "",& d *. BROOK Page 1 Of 1 -Yarw.,umL!Ex -*ruar=b-m APP: SLD NO ?
5 Rev 1.0 3/5/2008 Recheck of LBK-T fuse size; Steps to select power transformer fuse: 1. Select voltage rating 2. Check interrupting rating. 3. Select ampere rating and speed. 4. Check co-ordination with loadside device. 5. Check co-ordination with source side device. Fuse Voltage Rating Selection... HV system voltage (kv) Voltage rating selected should always be in excess of the system phase-to-phase voltage. Recall that in all likelihood one of any two fuses carrying fault current will melt before the other. Thus a full phase-to-phase recovery voltage will appear across the blown fuse. Fuse manufacturer Select holder type Select voltage rating Fuse interrupting rating... LLL maximum fault level at fuse Angle 3-phase. XR ratio for above. Assymetryfactor based on XR ratio (See graph window) Assymetrical L3 fault level Phase-to-ground maximum fault level at fuse location. Angle- phase-to-ground.
6 XR ratio for above. Assymetry factor based on XR ratio Assymetrical LG fault level S & C kv asymmetrical interrupting rating (MVA) S & C kv symmetrical interrupting rating (MVA) (f the rating is higher than the fault levels above, the selected fuse can interrupt these faults. A lower XR ratio for the fault levels above will allow a higher safety margin.) Determine fusing ratio /111//1///1/1111////1//1/1/1/1/1/111/1/1~ Fusing ratio = Fuse rating / Xfmr self-cooled MVA rating Transformer self-cooled MVA rating Full load amps at kv Transformer MVA rating with full cooling Full load amps at kv Select a fuse size Fuse letter code Fusing ratio with above Corresponding rating (MVA) Simple overload capacity (Transformer FL 12 x fuse rating) (A fuse will normally carry approximately 2X its current rating before it will start to melt.) mpedance limited secondary faults may reduce the short circuit current to the order of % of the transformer rated full-load current. Overcurrents of this magnitude definitely accelerate transformer aging and should be cleared promptly. This basically requires a low fusing ratio. S&C recommends that fusing ratios should be less than 1.5 and no greater than 2.0.
7 L 0 C AT 1 0 N Device Fuse Manufacturer Manufacturer's designation kv rating Size Fuse speed rating Holder type Manufacturer's catalog number Curve numbers Lookout Brook LBK-T-FD S&C SMD-1 A 69 80E Standard SMD-1A COMMENTS: L 0 C AT 0 N Lookout Brook Relay type MCGG22 System kv CT Ratio:l 20 CT connection Y Rated current of the CT secondary (n) 5 DEVCE ---> Relay range (increments of 0.05) Range in secondary amps (s) (relay range x n) Pickup setting (s/ln) Pickup setting, sec. amps (s) (pickup x n) Time multiplier (0.025-l)(increments of 0.025) MVA setting Operating Cuwe DEVCE ---> Relay range (increments of 1) Range in secondary amps (relay range x s) Pickup setting Pickup setting, sec. amps (pickup x s) MVA setting LBK-T -51 N LBK-T -50NLV 1-31 (5-155) X s > Very nverse COMMENTS Change the Pickup setting from 0.4 (2.3 33KV) to 0..2 ( KV).
8 Convert 403L to 66 KV Phase Settings 1>1 Function EC E nverse 1>1 Direction Non-Directional 1>1 Current Set A 1>1 TMS 100.Oe-3-1>1 treset 0 s s2 Function ~Tabled s3 Status Enabled 1>3 Direction Non-Directional 1>3 Current Set A r3 Time Delay fosf 1>4 Status Disabled > Blocking OOl-ll -. > Char Angle deg V CONTROLLED VCO Status Disabled. Change 14 Function from EC v nverse to EC E nverse. 2. Change 1>1 TMS from to Change 14 Current from 201 amps to 111 amps. 4. Change 1>3 Current set from 1359 amps to 795 amps. Page 3 of 6
9 Maximum Generation Fault LBK 2.4 kv Global Current Report Faulted Bus LBK 02 LBK 02 Branch id 403L(B) 403L(B) Type Line Line Fault type LLL LLL Branch Side ROB 403L-D3 LBK T-A la [A] la [deg] b [A] lb deg] c [A] lc [deg] n [A] 0 0 n [deg] 0 0
10 Minimum Generation Fault LBK 2.4 kv. LBK plant on. LBK 02 LBK G1 Generator 2.4 LLL Global Current Report l~aulted ~~~~~-~ Bus L8K 02 LBK 02 Branch id 403L(B) 403L(B) Type Line Line Fault type LLL LLL Branch Sid~ 41 ROB LBK T-A la [deg] lb [A] b [deg] lc[a] c [degl n [degl 0 0
11 Breaker clearing time Max Gen Breaker clearing lime Min Gen Fuse clearing lime Max Gen. Fuse clearing lime Min Gen. PLOTTNG VOLTAGE:66 kv BY: D. Jones beg-?hfd~#w ~f Plol shows miscoordinalion belween B ewr and Fuse. DATE: Sll~u- X.\COMM\Arc Flash\Planls\LBK\LBK 2009 Ravisw\LBK Mln Gen tcc
12 Breaker clearing time Max Gen PLOTTNG VOLTAGE:66 kv Breaker clearing time Min Gen Fuse clearing lime Max Gen. Stodv: X\COMM\Arc Flash\Planls\LBK\LBK 2009 Review\LBK Max Gen cc BY: D. Jones Fuse clearing lime Min Gen. LGrC l4 r(j FitV~r Plot shorn miscoordinalion behveen B ewr and Fuse. DATE:
13 Arc Flash Hazard LBK 2.4 kv with 80E fuses installed on LBK-T transformer. 403L converted to 66 kv EEE standard Faulted Bus LBK 2.4 LBK 2.4 Generation Max Min Fault LLL LLL Fault Current CT CT Plus Fuses Working Distance Flash Hazard Boundry cal cm PPE Level 4 >4 L.A.B " R.A.B P.A.B. 7" 7" Faulted Bus LBK 2.4 LBK 2.4 Generation Max Min Fault LLL LLL Fault Current CT CT Plus Fuses Working Distance Flash Hazard Boundry callcm PPE Level 3 3 L.A.B " R.A.B P.A.B. 7" 7" *Arc Flash Calculated for Switchgear and fixed conductor. Software won't supply Arc Flash results for clearing times over one second. L.A.B. R.A.B. P.A.B. Limited Approach Boundry Restricted Approach Boundry Prohibited Approach Boundry Miscoordination between STG-403L-B and LBK-T fuses for 2.4 kv bus fault. Used fuse Clearing Time for Arc Flash Study as this would be worst case.
14 EEE 1584 based arc flash calculator EEE 1584 Based Arc Flash Calculator and Warning Label Creator Eguivment Class between Conductors 104 mm. Grounding Type Grounded Working Distance mm. Available 3 Phase Bolted Current ka System Voltage 2400 Volt 1 agree to be bound with Terms & Conditions of this website. E Calculate Boundaries Equipment Type: Switchgear Typical Gap bw. Electrodes: 104mm. Grounding: Grounded Work Distance: mm. Arc Predicted Arcing Current: sec. Arc 15% Reduced Arc Current : sec. Available 30 Bolted Current: ka Predicted 30 Arcing Current: A System Voltage L-L: 2400 Volt Calculation Ma!! ncident Energy Exposure Protection Level Boundary ilyofep! (ca'/cm2) 100% Arcing Current % Arcing Current
15 EEE 1584 based arc flash calculator EEE 1584 Based Arc Flash Calculator and Warning Label Creator Equipment Class Swltchgear Gap between Conductors 104 mm. Groundtng T s Grounded Working Distance mm. (( Available 3 Phase Bolted Current ka System Voltage 2400 Volt H agree to be bound with Terms & Conditions of this website. Calculate Boundaries 3 Equipment Type: Switchgear Typical Gap bw. Electrodes: 104mm. Grounding: Grounded Work Distance: mtn. Arc Predicted Arcing Current: sec. Arc 15% Reduced Arc Current : sec. Available 3 0 Bolted Current: ka Predicted 3 0 Arcing Current: A System Voltage L-L: 2400 Volt ncident Ener~y Calculation Exposur-e Protection M e Boundary ofppe (cal/cm2) 100% Arcing 85% Arcing Current
16 EEE 1584 based arc flash calculator EEE 1584 Based Arc Flash Calculator and Warning Label Creator Equipment Class Switchgear J Gap between Conductors 104 mm. Groundine Tyw Grounded Working Distance mm. A-vacable 3 Phase Bolted Current ka System Voltage 2400 Volt agree to be bound with Tenns & Conditions of this website. Calculate Boundaries Equipment Type: Switchgear Typical Gap bw. Electrodes: 104m1n. Grounding: Grounded Work Distance: mm. Arc Predicted Arcing Current: see. Arc 15% Reduced Arc Current : sec. Available 30 Bolted Current: ka Predicted 30 Arcing Current: A System Voltage L-L: 2400 Volt Calculation Mode ncident Enerm Exposure (callcm :) Flash Protection Level Boundary dlpe 100% Arcing 85% Arcing Current
17 EEE 1584 based arc flash calculator EEE 1584 Based Arc Flash Calculator and Warning Label Creator Equip~nent Class Sw~tchgear Gap between Conductor$ 104 mm. Grounding Typ_e Grounded WorkingDistance mm, Available 3 Phase Bolted Current ka System Voltage 2400 Volt 3 1 agree to be bound with Terns & Conditions of this website. Calculate Boundaries 1 Equipment Type: Switchgear Typical Gap bw. Electrodes: 104mm. Grounding: Grounded Work Distance: mm. Arc Predicted Arcing Current: sec. Arc 15% Reduced Arc Currcnt : sec. Available 30 Bolted Currcnt: ka Predicted 30 Arcing Current: A System Voltage L-L: 2400 Volt Calculation Mode ncident Energy Exposure (callcm 2) Protection Level Boundary ofpee 100% Arcing 85% Arcing Current
18 A WARNNG 1 Arc plasn ana anock nazara Appropriate PPE Required Flash Hazard Boundary 44.1 cal cm2 Flash Hazard at 406 mm >4 PPE Level De-energize Switchgear or Change Protection Settings to Reduce Hazard Category nside Any Switchgear Cubicle Compartment VAC Shock Hazard l~~ui~ment Name LBK 2.4kV A WARNNG Arc Flasn ana anocn nazaru Appropriate PPE Required Flash Hazard Boundary 20.0 call cm2 Flash Hazard at 914 mm 3 PPE Level Flash Suit or nsulated Pants and Jacket; Hard Hat; Safety Glasses; Flash Suit Hood; Hearing, Hand & Foot Protection Breaker Operation - Open or Close Breaker Operation - Racking 2400 VAC Shock Hazard Equipment Name LBK 2.4kV Arc Flash and Shock Hazard Appropriate PPE Required 3 m Flash Hazard Boundary 8 cal cm2 Flash Hazard at 914 mm 2 PPE Level Flash Suit or FR Work Shirt With Either Flash Pants or FR Coverall & Denim Pants Hard Hat; Safety Glasses; Arc Rated Face Shield; Hearing, Hand &Foot Protection Breaker Operation With Cubicle Door Fully Secured 2400 VAC Shock Hazard Equipment Name LBK 2.4kV
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