Substation Commissioning Procedures.pdf

8/12/2019 Substation Commissioning Procedures.pdf

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Substation

Commissioning


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Topics

Project Overview Review Work Plan Substation Equipment Testing

Power Circuit Breakers

Power Transformers

Capacitors


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Project Overview Reviewing the Work Plan

Planning and Co-ordinating the WorkPlan Communicating Verifying

Testing

Troubleshooting, Re-verifying, Re-testing

Completing Project Documentation


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Review the Work

Plan

Review the Work

Plan

Identify whats happening Who will be involved? Identify Responsibilities

Review Project Documentation

Develop Work Sequence

Identify whats happening Who will be involved? Identify Responsibilities

Review Project Documentation

Develop Work Sequence


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Power Circuit Breakers


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Power Circuit Breaker Guidelines

Test CTs

Measure Coils & Megger

Wiring & Jumpers

Physical OrientationVerify Prints

Record Nameplate

Data


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Testing CTs

Ratio, Polarity, & Burden

Open Circuit Excitation

Buzz & Megger Cables

Terminate Hardwired Shorts on Spares

Verify CT circuits only grounded @ one point

Verify Shorting Bar is GROUNDED


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Gas Fill & Measure

Test CTs


Wiring & Jumpers


Record Nameplate

Data


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SF6 Parameters


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Wiring Checks

Check Timing

Gas Fill & Measure

Test CTs


Wiring & Jumpers


Record Nameplate

Data


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Purpose:

Method:

Analysis

:

Breaker Timing

Verifies Breaker Contacts are Opening

& Closing within acceptable time limits

Measure Tripping & Closing Times

Contact Velocities & Inter-pole Spread


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Time (ms)

Time & Travel for Close (Contact Velocity)

Distance

36 mm/ 14 ms =2.57 m/s


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Breaker Timing Test

PlanTrip (Both Trip Coils)

Close w/ X Coil Included

Reclose using each Trip Coil

Trip-Free using each Trip Coil

Close w/ X Coil Excluded


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Breaker Timing

Start w/ a Close Shot TC1 Reclose

Trip & Trip Free on

TC1App note 7 close

(Move leads to TC2)

App note 7 reclose

w/TC2 connected

Trip & Trip Free onTC2

PCB Open PCB Closed

All done with only 8 operations


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Wiring Checks

Energy Storage

Checks

Primary Contact

Resistance

Check Timing

Gas Fill & Measure (after 24

hrs)

Test CTs

Measure Coils & Hand Megger

Wiring & Jumpers


Record Nameplate

Data


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Energy Storage

SystemsSpring Pressure Rundown Checks

Spring Discharge

Overnight Sag

Motor Start/Stop

Low Spring AlarmOperation Block


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Energy Storage

Systems

Temperature

Compensated

SF6 Purity & Moisture

Gas Density Checks


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Wiring Checks

Final Moisture

Accessory and Alarm

Checks

Operational Checks /

Load Overall

Power Factor

Energy Storage

Primary Contact

Resistance

Check Timing

Gas Fill & Measure

Test CTs


Wiring & Jumpers


Record Nameplate

Data

Final Checks


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Final Checks

Trip Checks - Local & Remote

Alarms & Indications - Local & Remote - SCADA

CT Final Checks

Bridge & Dummy Load PT Circuits

Gas Pressures

Ground Switches Open / All Relays in Service

Hi-Pot w/ System Voltage

Close PCB & Pick-up Load


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QuickTime and aH.264 decompressor

are needed to see this picture.


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PCB Final Checks

Trip Checks - Local and Remote

Alarms - Local & Remote - SCADA

CT Final Checks

Bridge & Dummy Load PT Circuits

Gas Pressures

Ground Switches Open / All Relays in Service

Hi-Pot w/ System Voltage

In Service Checks

Close PCB & Pick-up Load


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Power Transformers


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Transformer Testing Guidelines

Oil Processing / Sample

Test CTs

Hand Meggering

Wiring & Jumpers

Physical Orientation

Auxiliary Components

Record Nameplate

Data

Insulation Power Factor


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Capacitive Current Leakage Current

Capacitance representsability to store energy

when voltage is applied

Dissipated energy andheating from applied

voltage across insulation

Measuring Dielectric Loss


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Here it is Ratio of Dielectric Losses to Total Power supplied,

or ratio of leakage current to total current.Example: Total Power = 460 mVA with 3.3 mW : Calculated % PF = 0.72

% Power Factor in general: Ratio of Watts to Total

Power


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Insulation Power Factor Grounded Specimen Test (Ground)


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Grounded Specimen Test w/ LV guarded out (Guard)



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Un-grounded Specimen Test (UST)



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Ground, Guard, & UST



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Ground


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Guard


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UST


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Ground


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Guard + UST


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Excitation Current


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Excitation Current


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Bushings

Bushing


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Bushing

s

Higher Voltages have potential taps w/ C2 > C1. Check Nameplate before

applying voltages. Megger Bushing and its tap if no PF test set is

available.


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Winding Ratio, Polarity

Oil Processing/ Sample

Test CTs

Hand Meggering

Wiring & Jumpers



Record Nameplate

Data


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Purpose:Checks Turns Ratio & Polarity on all tap

connections

Method: TTR Test Set continually through all taps.

Analysis

:

Measured Ratio and Nameplate should match

very closely (0.2%)

Measured Ratio will be slightly lower than

calculated due to slight losses in TTR test set.

Shorted turns & high contact resistance indicated

by high excitation current. Ratio error greater

than 0.2% will be easily noted.


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Test CTs

Hand Meggering

Wiring & Jumpers



Record Nameplate

Data

Impedance

Measuring Impedance


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g p

Purpose:

Method:

Analysis

:

Detect shipping damage & basis for future tests

Compare with Nameplate at Nominal Taps

Useful for determining core and coil shifting,

loose or high resistance connections

Measuring Impedance


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g p

Measuring Impedance


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g p

In General:

3 Phase wye-wye or

wye-delta

3 Phase delta-delta

Zero-sequence

T f T ti G id li


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Test CTs

Hand Meggering

Wiring & Jumpers



Record Nameplate

Data

Impedance

Calibrate Temperature


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T f T ti G id li


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Test CTs

Hand Meggering

Wiring & Jumpers



Record Nameplate

Data

Impedance

Calibrate Temperature

Bump Fans & Pumps

Bushing Pot Devices

DC Winding Resistance

Megger Core Ground &Windings

Trip Checks


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Capacitors

esting Capacitors (Impedance)Start with Nameplate rating on

200 KVAR @ 22800 V


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Sta t t a ep ate at g o

Can:

200 KVAR @ 22800 V

I = kVAR / kV

I = 200 / 22.8 = 8.77 A

Xc (per can) = I / jw(C)

Xc (per can) = 22800 / 8.77 = 2600 Ohms

C = 1 / 377 (Xc)

C = 1 / 377 (2600) = 1.02 microF

Each Can is then rated @ 1.02 microF

Q (kVar)= V I sin (theta)

= V / I

Testing Capacitors (Contd)


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C (meas) = I (meas) / V (meas) * 377

Number of Cells in Test?

100.58 0.859 22.6

100.44 0.867 22.8

100.56 0.860 22.6

Vmeas Imeas Cmeas

with V (meas) @ 100V, measure I

22

1.02 * 22 = 22.4 microF Cap. per layer

Build Data Sheet

22.4 0.2 0.89

22.4 0.4 1.79

22.4 0.2 0.89

Ccalc d %d


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Rack Wiring

Wiring Checks


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Compare Schematics w/ Wiring Prints

Buzz point to point

Check Diodes

Contact Makeups

Test Switches

Terminal Blocks

Jumpers

Wiring Checks


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Relay

In Service Checks


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In Service Checks Pre-determine the measurements.


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Cutout your TRIPS Magnitude and polarity of each current

and voltage (phase angle and rotation) Look for quantities where you do and

dont expect them to be.

Open CTs & Shorted CTs

Wrong Ratios

Neutral Connections

Proper Potentials


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Stay SAFE...

Thank you

for joiningus.

Documents

Substation Commissioning Procedures.pdf