Preventive Maintenance/ Electric Service EquipmentBy Neil LaBrake, Jr., PE, National Grid, Syracuse, NY, November 10, 2009 at Turning Stone Resort

AcknowledgementsNeil F. LaBrake, Jr., P.E. - Customer Facilities EngineerNational GridChuck Mello, S.E.T. Field Evaluation Program ManagerUnderwriters Laboratories Inc.Timothy M. Croushore, P.E. - Product ManagerAllegheny PowerThomas L. Adams, P.E. - Commercial ConsultantExelon Corp.Barry N. Hornberger, P.E. - Sr. Engineer, New BusinessPECO Energy Co. an Exelon CompanyRichard Maybury, P.E. founder and PresidentHMT Inc.John Pertgen Project EngineerHMT Inc.William Sieling, P.E. PresidentPrinciple Engineering

NFPA; IEEE; NETA; OSHA; EEI; UL; IAEI

Introduction to NFPA 70B and NETA-MTS for maintenance inspection of medium and high voltage equipment.NFPA 70B-2006 Recommended Practice for Electrical Equipment Maintenance NETA-MTS-2007 -Maintenance Testing Specifications for Electrical Power Distribution Equipment and SystemsGeneral review of National Grid ESB 755.ESB 755-2003 Operation & Maintenance Requirements for Services above 600 voltsObjectives:

DisclaimerThe information presented and its accompanying classroom instruction reflect what is considered good practice with regard to safety, operation, and maintenance of electrical substations.It is not intended to act as a substitute for an electrical safety program or to bring your facility into compliance with OSHA or other regulations or act as a substitute for expert advise from the manufacturer of your equipment. The responsibility for developing a safety program, insuring compliance with OSHA and other regulations, and the operation and maintenance of equipment ultimately rests with the owner/operator of the facility.This Information Seminar should not be considered as official instruction or training in the area of high voltage safety. Attendees are not certified or qualified to work on or around energized equipment. Through this Information Seminar, the utility representatives are simply sharing their utilitys typical practices in an effort to raise customer awareness of high voltage issues. Your organizations Safety Department and the manufacturer of your equipment are the best source for specific high voltage information.

Electric Service Connection which includes the service lateral, service entrance conductors, meter provision, service equipment, and grounding NESC applicable NEC applicable NESC applicable for equipment under exclusive control by utility Where the Electric Utility has Mutual Interest

Electrical Preventive Maintenance - EPMKey Factor to High Reliability

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Percentage of Failure Caused from Inadequate Maintenance Versus Months Since Maintained

Failure (months since maintained)All Electrical Equipment Classes CombinedCircuit BreakersMotorsOpen WireTrans- formers

Less than 12 months ago7.4%*12.5%8.8%*0*2.9%

12-24 months ago11.2%19.2%8.8%*22.2%*2.6%

More than 24 months ago36.7%77.8%44.4%38.2%36.4%

Total16.4%20.8%15.8%30.6%11.1%

*Small sample size; less than 7 failures caused by inadequate maintenance. Table 44, IEEE Std 493-1990

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The Bottom Line of EPM

REFERENCES for MAINTENANCE SCHEDULE Manufacturer Instruction ManualsRefer to Station Single Line DiagramApplicable Local Rules (http://www.nationalgridus.com/electricalspecifications)NFPA 70B (http://www.nfpa.org/)NETA MTS (http://www.netaworld.org/)

For Main Service, Keep Serving Utility Informed of Electrical Problems and Planned Changes.

NFPA 70BOverview1.1.1Applies to preventive maintenance for electrical, electronic, and communication systems and equipment and is not intended to duplicate or supersede instructions that manufacturers normally provide.

NFPA 70B (contd)Lists Recommended Actions for Specific EquipmentRecommended Maintenance Activities & TestsRecommended Maintenance Periods

Reference Publications ANSI, ASTM, IEEE, NEMA, UL, US Gov, & Others

NETA MTS OverviewMaintenance Testing Specifications

.. Is a document for use by those responsible for the continued operation of existing electrical systems and equipment to guide them in specifying and performing necessary tests

Purpose:To assure that tested electrical equipment and systems are operational .and are suitable for continued serviceNETA MTS (contd)ReferencesTesting Organization QualificationsSafety & Equipment NeededPower System StudiesInspection & Test Procedures for Specific EquipmentSystem Function TestsThermographyTables (values & data)

NETA MTS (contd)Section 7 Inspection & Test ProceduresVisual & Mechanical InspectionElectrical TestsTest Values

Personnel SafetyNFPA 70E

Station Inspection SheetsInspections performed at least once a day or week. Suggested Items:Transformers - temp, oil level, pressure, explosion relief, fans, bushing & paint condition.Breakers - oil level, counter readings, bushings.Switches - glass, jaws, blades & connections.Batteries - sp. gravity, temp,voltage, amps, grounds.Yard - debris, weeds, fence & danger signs.Check for unusual smells or soundsCheck for Clearance of Foreign MaterialWatch for WaterPipes & DrainsRain runoffCheck Enclosures and Locks to Restrict Access

Some Considerations for Electrical InspectionELECTRIC SERVICE ACCEPTANCE SURVEY CHECKLISTFOR USER-OWNED STATIONS - MEDIUM AND HIGH VOLTAGE(reference: National Electrical Safety Code)See Parts 1 and 2 in the NESCSee Part 1 in the NESC

B. STATION:

1. Surfacing

2. Lightning Masts

3. Fence and Gates

4. Locking provisions on

gates & main disconnect

5. Accessibility

6. Danger Signs

7. Customer has operating equipment,

personnel & Maintenance/Test procedures

A. CLEARANCES:

1. Phase-to-Phase

2. Phase-to-Ground

3. Vertical

4. Safety

5. Working space

ELECTRIC SERVICE ACCEPTANCE SURVEY CHECKLIST contdSee Part 1 in the NESCSee Section 9 in the NESC

C. SERVICE:

1. Main Disconnect Switch

2. Protective Equipment __Fuses __Ckt. Breaker __HV Fault Interrupter

3. Surge Protection

4. Insulators and connections

5. Power Transformer(s) - N.P. Data

6. Control circuits and battery system functional

7. Protective Relays - Settings issued & devices calibrated & functionally tested

D. GROUNDING:

1. Ground Grid Resistance Test

2. Station Equipment and Fence

3. Main Disc. Switch Handle and Potential Equalizing Grid

ELECTRIC SERVICE ACCEPTANCE SURVEY CHECKLIST contdSee Part 1 in the NESCandlocal utility requirements

F. METERING:

1. V.T.s and C.T.s

2. Secondary Conduit

3. Meter Panel

G. OTHER:

1. Final set of drawings & nameplate info.

2. Transformer Test Report

3. Switching Operating Procedure (see Part 4 of the NESC)

4. Generator Characteristics Data (applicable to parallel generation projects)

NFPA 70B

Figure F.8Typical Electrical Switchgear Associated Equipment Inspection Record

NFPA 70B

Figure F.17Typical Transformer - Liquid Filled - Inspection Record

NFPA 70B

Fig. F.21

Typical Battery Tests

NFPA 70B

Annex IRecommended Maintenance Intervals

ESB 755 O&M Requirements PSC 220 Rule 4.14.1 Company is not responsible for the adequacy or safety of customer's equipment or wiring. Company reserves the right to discontinue service whenever customer fails to maintain such equipment and wiring in a safe and adequate condition or fails to utilize electricity in such a manner as to avoid interference with the service furnished by Company to other customers, or with the use of service by customer or others.

ESB 755 O&M Requirements PSC 220 Rule 14.314.3 In addition to the provisions of the Service Classifications as to the term of their respective Agreements for Service, the Company reserves the right to withhold service or to discontinue service or terminate any agreement therefore, in such manner as may be permitted by law under the circumstances, if the customer at any time refuses or fails to make application and Agreement for Service as provided by this schedule or defaults in the payment of a bill rendered for service, or if the customer refuses or fails to comply with any applicable provision, rule, regulation, term or condition of this schedule, or with any applicable law or order of the Public Service Commission or other authorities having jurisdiction, or if the customer's installation or part thereof is deemed by the Company to be unsafe, inadequate or unsuitable for receiving the Company's service, or to interfere with or impair the continuity or quality of the Company's service to the customer or to others, or if changes at customer's premises cause Company's facilities to become unsafe, inadequate or unsuitable.

ESB 755 O&M Requirements Section 1.1.1The Companys Tariff, PSC No. 220, states that the Company is not responsible for the adequacy or safety of the Customer's equipment or wiring. Further, the Company reserves the right to discontinue service whenever the Customer fails to maintain such equipment and wiring in a safe and adequate condition or fails to utilize electricity in such a manner as to avoid interference with the service furnished by the Company to other customers, or with the use of service by the Customer or others.

ESB 755 Section 2.0 Customer Responsibility

Equipment shall meet National Grid specsUp to date drawingsQualified O&M personnelProtective relay testingNational Grid witness of relay functionality

ESB 755 Section 3.2 Operating Protocol

For mutual interest of the service connectionCustomer to follow switching protocol with the National Grids Dispatch & Control CenterCustomer to have switching instructions for energization under normal and abnormal situationsApproach distance to National Grid-energized facilities shall be adhered

ESB 755 Section 4.0 Routine MaintenanceCustomer shall perform proper O&M on stationCustomer shall provide qualified personnel and toolsAccess to National Grid metering spacesProtective relay testing every 2 to 6 yearsSubmit written affirmation that testing has been completed upon request.

ESB 755 Requirement for Documenting Routine Maintenance

Proper EPM can prevent this!

Questions?

What we covered:NFPA 70B and NETA-MTS for maintenance inspection of medium and high voltage equipment.

National Grids ESB 755.

These are the folks who assisted in the development of this program based on my involvement with them over the past 2 years presenting similar high voltage programs.This is an overview presentation of medium and high voltage installation compliance relative to the National Electrical Safety Code and NFPA standards, structured primarily to an electrical inspector and installer audience. The presentation will cover articles in the NEC requiring the information in the NESC, NFPA 70E, and NFPA 70B for installing, working safely, and maintaining medium and high voltage installations.

The following organizations may offer certified training:OSHAHigh Voltage Proximity Act (NYS)UFPO (Dig Safely program)Individual State Regs/Laws

This is a good point for the Electric Utility Presenter to discuss their published rules for electric service in their area.

Also, point out that it is good for trade allies to get to know their local utility representative involved in maintaining their electric service rules. Relationship building in this regard goes a long way to mutual understanding of electrical installations where the electric utility supply meets premises wiring.Neil.These are some ideas of what an electrical inspector can look for and these checklists are shown as examples only. Local conditions of service may change.This is what can happen if preventive maintenance is not done on high voltage equipment!Facilitate the Q&A session.