Inspection Procedure and Testing Electrical Equipment.pdf

Procedure
Field Inspection and Testing
Electrical Equipment
Document

Procedure Field Inspection and
Testing Electrical Equipment
Table of Contents
Section Title Page
1.0 PURPOSE 2
2.0 CODE, STANDARD AND SPECIFICATION 2
3.0
3.1
3.2
SAFETY PROCEDURE
General Procedures
Electrical Equipment
2
2
2
4.0
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
4.10
4.11
4.12
4.13
4.14
4.15
INSPECTION AND TESTS
Purpose
Transformer
Switchgear and MCC
Electric Motors
Cables
Grounding System
Lighting Installation
Electrical Monitoring System
UPS / Battery Charger and Batteries
Diesel Engine Generator
Distribution Panel
Telecommunication System
Cathodic Protection System
Heat Tracing System
Miscellaneous
4
4
4
5
6
7
7
7
8
8
9
9
9
10
10
10
5.0
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.10
5.11
5.12
5.13
5.14
5.15
5.16
6.0
TEST METHOD
Insulation Resistance Test
High Voltage Test
Grounding Resistance Test
Grounding Continuity Test
Electrical Continuity Test
Contact Resistance Measurement
Power Transformer Polarity Test
Dielectric Strength Test
Current Transformer Test
Voltage Transformer Test
Interlock and Control Test
Protective Relay Test
Dielectric Absorption Test
Lighting Circuit Test
Electrical Distribution System Phase Rotation Check & Polarity Test
Running Test of Motor Uncoupled
ACCEPTANCE CRITERIA ……………………………………………
10
10
11
12
12
13
13
13
14
14
16
16
16
17
17
17
18
18
1.0 PURPOSE
Page 2 Updated – 19/04/2012

This specification covers the procedures for field inspection and pre-commissioning of
electrical equipment and installations for Betara Complex Development Project.
2.0 CODE, STANDARD AND SPECIFICATION
The requirements contained in the latest editions of the following publications shall form a part
of this specification in the manner and to the extent specified herein.
- Indonesian Law
- Statutory Regulation
- American National Standard Institute (ANSI)
- American Petroleum Institute (API)
- International Electro Technical Commission (IEC)
- National Electrical Manufacturer’s Association (NEMA)
- National Electrical Code (NEC) NFPA 70
- PCI’s Specification:
- BCD03-01-00-46-CRT-001-1 (Electrical Design Criteria)
- BCD03-01-00-46-SPC-013-1 (Specification Electrical Installation)
3.0 SAFETY PROCEDURE
3.1 General Procedures
1. Whenever inspection and tests are to be performed on electrical facilities, safety
should be the primary consideration at all times. To assure the safety of testing and
construction personnel, assume that:
(1) Any underground circuit is energized until tests show otherwise or until it is
grounded.
(2) Wiring is incorrect.
(3) Motors are connected to run in reverse.
(4) Phases are different across a bus-tie breaker.
(5) Everything needs checking.
2. Safety assurance during the testing of electrical systems cannot be overemphasized.
Wherever possible, all power sources must be isolated by opening and withdrawing
the breakers. Tag all breakers and padlock switches if necessary.
3. Unauthorized personnel must be kept away from test work. Rope off the area if
necessary. Provide warning signs. Plan ahead and think before acting. One good
way to avoid trouble is to write down the sequence before proceeding with a complex
or hazardous inspection or test.
4. Use applicable personal protection equipment (PPE) when working on electrical
equipment at any rated voltage.
3.2 Electrical Equipment
Here are mostly electrical equipments that we should take a concern to the safety since
certain test equipment can cause painful, if not lethal, shocks. However, it does not mean
we are not care to the other electrical equipment. The same safety procedures should be
followed.

1. Transformers
a. Remember that certain test equipment such as megger and dielectric test sets can
cause painful, if not lethal, shocks. Be careful when working with transformers; low
voltages applied to the secondary windings can produce lethal voltages at the
primary terminals.
b. Remember that open-circuit secondary windings of current transformers can
produce extremely high voltages if their primaries are excited.
c. All secondary of current transformers should be short-circuited whenever their
loads are removed. For example, the current transformer should be short-circuited
when the ammeter is removed.
2. Switchgear and MCC
a. When working on any one circuit, be sure to positively identify the specific source
breaker(s) and then lock it open and tag it. In the case of draw-out type gear,
remove the breaker from its operating position. Make sure that personnel working
on the equipment are familiar with the test procedures. Make sure they observe
that the breaker is locked open.
b. Serious accidents may result due to improper switchgear operation. If switchgear
cannot be mounted in a rack, or switched on, it must not be forced.
c. It should also be remembered that secondary- selective substations allow electrical
power to be maintained at all plant loads, while individual system elements are de-
energized for inspections or tests.
3. Cables
a. Establish that the circuit is dead by testing it with a high voltage detector (glow-
stick), or in the case of low voltage use a voltage tester.
b. Make sure that the glow-stick, voltmeter, or voltage tester is in working order, by
checking it against a live cable or test device both before and after the circuit check.
c. In addition to these tests, the source circuit breaker should be opened and tagged.
Only after these precautions have been taken, the testing and checking of circuits
can be started.
d. When a long cable is impressed with voltage and a megger is used during tests, the
cable can still give a painful kick after the source is removed. Before allowing
personnel to work on the cable, the cable must be discharged by connecting an
insulated wire to earth.
4. Motors
a. Before any work is done on a motor, ensure that the motor controller has been
disconnected and tagged out. If possible, the motor feeder should be connected to
earth.
b. If it is necessary to remove a motor for repair, always remember to reconnect the
earth to the motor frame when reinstalling.

4.0 INSPECTION AND TESTS
4.1 Purpose
The inspection and tests described in this procedure shall be carried out at the
appropriate time both during and after the installation or erection of the electrical facilities.
At the beginning of the electrical inspection and tests, the check sheets (Appendix l) shall
be filled in by the inspection engineer.
4.2 Transformer
The following general items shall be checked, inspected, and tested. Detail requirements
for inspection and testing should refer to the check sheet, appendix-1. Check & inspection
result, general information of transformers shall be filled in this check sheet.
4.2.1 Two-Winding Transformer (13.8/0.48kV)
Visual and Mechanical Inspection
1. The rating on the nameplate same with drawing and specification
2. The design meets the area classification where the transformer is installed.
3. The bushing seals are satisfactory.
4. The oil level for main tank is correct and there is no leakage.
5. The valves and pipe plugs are correct and tight.
6. The cables and connections are correct and firm.
7. The cable glands are tight.
8. The cable gland mounting plate is suitable for magnetic flux.
9. The terminal box seals are satisfactory.
10. The bolting and gaskets are tight and satisfactory.
11. The dehydrator of the breather is good.
12. The pressure relief devices are correctly adjusted.
13. Check the continuity of the tap setting switch.
14. The bolting, clamping, etc. of the neutral connection is complete and firm.
15. Check the continuity of the equipment grounding connection (tank and
marshalling kiosk should be connected to earth).
16. The polarity of the terminals is correct.
Electrical Inspection Test
1. Measure the insulation resistance of high and low voltage winding
2. Perform a high voltage test of the winding.
3. Measure the dielectric strength of the insulation oil.
4. Perform turns-ratio test at all tap positions.
5. For transformer with OLTC (On Load Tap Changer), perform manual operation
through all tap position, driving motor rotation (Rise and Lower Position, set at
centre axe before energizing), Upper and lower limit switch.
6. Alarm, tripped, control circuit, and auxiliary circuit.
4.2.2 Two-Winding Transformer (480/380-220V)
For two winding transformer 480/380-220V the same procedure as two-winding
transformer 13.8/0.48kV should be performed.
4.2.3 Three-Winding Transformer (13.8/4.16/0.48kV and 13.8/0.48/0.48kV)
For three-winding transformer the same procedure as two winding transformer
should be performed.
4.3 Switchgear and MCC

result, general information of switchgear and MCC shall be filled in this check sheet.
1. 13.8kV and 4.16kV Switchgear and MCC
1. The rating on the nameplate and the switchboard layout is correct.
2. No unauthorized modifications have been performed.
3. The board assembly, bolting, and levelling are satisfactory.
4. The bus-bar connections and supports, control bus bars, and neutral bar
connections are complete and tight.
5. Contact resistance readings shall be taken for field assembled and complete
bus bar.
6. The grounding bars and connections inside the board and equipment are
complete and tight.
7. The safety features are satisfactory.
8. The type and rating of the fuses in use are correct. The gage ring rating of the
plug cartridge fuse bases are correct.
9. The type and rating of the circuit breakers are correct. The current setting and
tripping are correct.
10. The contacts of the draw-out mechanisms are correctly aligned.
11. The cable end bells (compounded type), glands, clamping, and termination are
in good condition.
12. Test the anti-condensation heaters.
13. The circuit wiring is correct. Including conformity with wiring diagram, correct
and sure connection to instrument and protective relays terminal, and the
identifications of the conductor. The relays and measuring instruments are
checked and tested. The rating and range are checked in accordance with
setting data if the ratings of current and potential transformers are adequate. All
blocking materials are removed. Adjust the relays and devices to the correct
duty point per setting data.
14. The indicating and signalling lamps or devices operate correctly.
15. The phase rotation and polarity of the electrical distribution system are correct.
16. The accessories and special tools are correct.
1. Perform insulation resistance test
2. Perform ratio and polarity test on all current and voltage transformer
3. Perform power frequency voltage test on main circuit
4. Dielectric test on aux. and control circuit
5. Perform interlock and control-wiring test consist in checking the proper
operation of all the electrical and electromechanical circuit, simulating the
various working conditions of switchgear as closely as possible.
2. 0.48kV Switchgear and MCC
1. The rating on the nameplate and the switchboard layout is correct.
2. No unauthorized modifications have been performed.
3. Holding down arrangement and seat alignment correct.
4. Ground bar and grounding correct and tight
5. Phase identification is correct.
6. Instrument, indication lamps and interlocks correct.

7. MCCB, Contactor, Fuses, Etc. correctly sized and identified as per Single Line
Diagram.
8. Padlocking facilities correct.
9. Ammeter and current transformer correctly installed.
10. Check internal for cleanliness.
11. Check manual operation of selector switch, MCB, push button, etc.
12. Incoming cables correctly installed, terminated and supported.
13. Unused cable entry sealed.
14. All internal cabling and wiring neat, correct and undamaged.
15. Heater correctly installed.
16. The relays and measuring instruments are checked and tested. The rating and
range are checked in accordance with setting data if the ratings of current and potential
transformers are adequate. All blocking materials are removed. Adjust the relays and devices to
the correct duty point per setting data
1. Perform dielectric withstand / dry insulation test.
2. Perform insulation resistance test.
3. Perform test of auxiliary and functionality. These functional tests consist of
checking the proper operation of all the electrical and electromechanical circuit,
simulating the various working conditions of switchgear as closely as possible.
4.4 Electric Motors
result, general information of electric motor shall be filled in this check sheet.
1. The rating on the nameplate is correct.
2. The design meets the area classification.
3. The shaft-blocking device is removed for transport.
4. The coupling alignment and rotor endplay are satisfactory.
5. Rotate the motor by hand.
6. The bearings, grease packing, grade and quality of grease, oil level, and oil rings
are in good condition.
7. The bolting and weatherproofing of the terminal box are complete and tight. The
terminal connections are correct and tight.
8. Test the anti-condensation heater.
9. The cable end bells and glands are completed and tightened.
10. The equipment grounding is completed and tightened.
11. The components of the cooling system are in good condition.
12. The push-button station is correctly installed.
13. The direction of rotation is correct.
1. Perform insulation resistance test.
2. Verify that resistance temperature detector (RTD) circuits, if applicable, conform to
drawings.
3. Verify that the motor space heater is functional.
4. Run the motor uncoupled and check the bearings for overheating.
5. Measure the voltage, amperage, and vibration during the uncoupled run.
4.5 Cables

result, general information of cables shall be filled in this check sheet.
1. The cable trench is clean and free from any foreign objects.
2. The size and installation are in accordance with the approved drawings.
3. The cable tray is correctly and rigidly installed.
4. The circuit indication and terminal numbering are correct and firm.
5. The cable end bells, oil or compound levels are satisfactory and there is no
leakage.
6. The cable end seals are complete and tight.
7. The cable glands are complete and tight.
8. The cable is protected against mechanical damage.
9. The underground cable joints are complete and meet the specifications.
10. The grounding connections are completed.
11. The cable terminations and connections are correct and tight.
12. The cable route markers are correct.
1. Measure the insulation resistance.
2. High-voltage test on cables (those rated at and above 4.16 kV)
3. Check the electrical continuity and cross connection of the conductors for parallel
feeders.
4.6 Grounding System
result, general information of grounding system shall be filled in this check sheet.
1. The grounding joints are complete and tight. The underground joints should be
spot-checked before they are backfill.
2. The size of the cables and installation comply with the approved drawings.
3. The installation of the electrodes is satisfactory.
4. Check the protective measures that have been taken against mechanical damage
to the system.
1. Measure the grounding resistance of each electrode.
2. Check the grounding continuity of the grounding system.
3. Measure the grounding resistance of the grounding system.
4.7 Lighting System
result, general information of lighting system shall be filled in this check sheet.

1. The enclosure for area classification.
2. The numbers and location of the equipment are correct.
3. The circuit numbers and load of the distribution panel are correct.
4. The switch ratings and the fuse ratings are correct.
5. The weatherproofing of the cable glands is satisfactory.
6. The feeder cable size is correct.
7. The equipment grounding is complete and tight.
8. The operation and setting of the time switches, photoelectric cells, magnetic control
switches, etc. are satisfactory.
9. The lighting circuit connection is correct for circuit numbering and identification.
1. Check the insulation resistance of each circuit.
2. Measure the illumination level.
3. Measure the voltage and phase at each socket.
4.8 Electrical Monitoring System (EMS)
for inspection and testing should refer to the check sheet (Hold), appendix-1. Check &
inspection result, general information of electrical monitoring system shall be filled in this
check sheet.
1. Check name plate and there is no damage and loss material / component as per
vendor drawing.
2. Check component of system are correctly installed in the location.
3. Check availability of power supply
1. Check system function and performance
2. Detail item to be tested in accordance with vendor document for testing.
4.9 UPS / Battery Charger and Batteries
result, general information of UPS / Battery Charger and Batteries shall be filled in this
check sheet.
1. The rating on the nameplate of the charger is correct.
2. The battery rating, voltage, and ampere-hours are correct.
3. The connected loads agree with the approved drawings.
4. The level of liquid in each cell is within the limit.
5. The protective devices for the battery charger, i.e. fuses, relay etc., are correct.
6. The cable connections are correct and tight.
7. The equipment grounding is complete.
8. The batteries are completely charged or voltage/cell within the limit

1. Verify correct AC input voltage
2. Verify charger output voltage regulation from no load to full load
3. Measure AC input current
4. Verify instrumentation and alarms.
4.10Diesel Engine Generator
result, general information of Diesel Engine Generator shall be filled in this check sheet.
2. The board assembly, bolting, and levelling are satisfactory.
4. The interlock and control are correct.
5. The phase rotation and polarity are correct.
7. Operation of the emergency power system equipment is satisfactory according with
manufacturer’s manuals.
1. Measure the insulation resistance
2. Calculate polarization index
3. Test protective relay device
4. Conduct performance test in accordance with the specification. Detail item to be
tested refer to vendor document for testing.
4.11Distribution Panel (e.g. Lighting panel, Control Panel, etc)
result, general information of Distribution Panel shall be filled in this check sheet.
2. No damage and loss material / component as per drawing.
1. Measure the insulation resistance
2. Adjust the relay and devices, if applicable, to the correct duty point per the setting data.
4.12Telecommunication Systems
The inspection and testing for the communication systems shall be carried out in
accordance with the manufacturer’s recommended procedures and manuals.
4.13Cathodic Protection System
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The installation of cathodic protection system shall be checked and tested in accordance
with the manufacturer’s recommended procedures and manuals.
4.14Heat Tracing System
The installation of Heat Tracing System shall be checked and tested in accordance with
the manufacturer’s recommended procedures and manuals.
4.15Miscellaneous
For the miscellaneous electrical equipment or installation that not specified on the above,
the detail inspection and testing should refer to the check sheet on appendix-1.
5.0 TEST METHODS
5.1 Insulation Resistance Test
1. The Insulation resistance shall be measured using an appropriate insulation tester
as shown in Figures 1 and 2.
Confirm that conductors, windings and metal frame other than tested are securely
grounded i.e. conductor screen, steel armour of cable, transformer frame, motor
frame, etc.
Figure - 1
“MEASURING RESISTANCE BETWEEN CONDUCTOR AND EARTH”
2. Voltages supplied by megger shall be as:
1. Circuits rated above 600V : 2500V
2. Circuits rated at 600V and below : 500V
3. Telephone system : 250V
3. Voltage shall be applied until the pointer remains steady. Insulation resistance of
HV motor shall be measured after 15 sec., 30 sec., 1 min., 10 min. to calculated the
polarization index.
4. Charged energy shall be discharged after a reading.
5. Complete an insulation resistance test data sheet for every test.
Page 11 Updated – 19/04/2012

Figure - 2
“MEASURING RESISTANCE BETWEEN CONDUCTORS”
5.2 High Voltage Test (This test shall be carried out by Vendor recommendation).
This test shall be applied to switchgear, and cables.
The switchgear shall be tested to disconnect from testing circuit of the inside equipment’s
i.e. instrument voltage transformer, lightning arrester, surge absorber, and neutral
grounding register.
2. DC test equipment can be used in case of cables with big capacitance.
3. When the insulation resistance measured is satisfactory, connect the high-voltage
test equipment as shown in Figure 3.
4. Increase the voltage gradually to the required value.
5. Read the voltage and leakage current when the voltage steadies at the required
voltage.
6. Maintain the voltage for the time.
7. After timing up, decrease the voltage gradually to ZERO, cut off voltage and then
discharge any residual voltage.
8. Measure the insulation resistance as before.
9. Complete a high-voltage test data sheet for every test.
Figure - 3
“HIGH – VOLTAGE TEST”
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5.3 Grounding Resistant Test
1. Grounding resistance shall be measured using an earth resistance tester, as shown in
Figure 4.
2. Grounding resistance shall be measured at each electrode.
3. Complete an grounding resistance test data sheet for every test.
Figure - 4
“MEASURING GROUNDING RESISTANCE”
5.4 Grounding Continuity Test
Before backfilling the grounding wiring, make a visual check of the underground
connections. Measure the electrical continuity by use of a circuit tester, according to the
following sequence:
1. Apply the circuit tester to all of the grounding electrodes, as shown in Figure
5 (1st step).
2. Apply the circuit tester between grounding electrode and the nearest
connected equipment, as shown in Figure 5 (2nd step).
3. Apply the circuit tester between adjacent connected equipment, as shown in
Figure 5 (3rd step).
4. Using the same procedure, check the resistance between all connected
equipment and grounding electrodes.
5. Complete an grounding continuity test data sheet for every test.
Figure - 5
“CHECKING GROUNDING CONTINUITY”
Page 13 Updated – 19/04/2012

5.5 Electrical Continuity Test
Measure electrical continuity by use of a circuit tester, according to the following
procedure: If metal sheath is not provided, one of core to be used instead of metal sheath.
1. Bond the conductor and metal sheath at one end of the cable with a wire
clip, as shown in Figure 6.
2. Apply the circuit tester between the same conductor and metal sheath, as
shown in the figure.
3. Using the same procedure, check the electrical continuity between all of the
conductors.
4. Complete a cable test data sheet for every test.
Figure - 6
“CHECKING ELECTRICAL CONTINUITY”
5.6 Contact Resistance Measurement
1. The test shall be applied to all bus bars bolted connection that are assembled at site and complete
bus bar.
2. Resistance of the connected parts shall be measured by low- resistance test set.
5.7 Power Transformer Polarity Test (Vector Test)
The test shall be applied for power transformers in accordance with the following
procedure:
1. Connect primary terminal "C" and secondary terminal "C", as shown in Figure 7.
2. Connect a temporary test power source to the primary side of the transformer and switch it on.
Figure - 7
“TESTING POLARITY OF POWER TRANSFORMER”
3. Measure the voltage between each terminal as follows:
Page 14 Updated – 19/04/2012

A – a V
A – b V
B – a V
B – b V
5.8 Dielectric Strength Test
This test shall be applied to electrical insulation oil in accordance with applicable standard.
Two samples shall be taken from the insulating oil. Each sample shall be tested
according to the following procedure:
1. Make the connections as shown in Figure 8.
Figure - 8
DIELECTRIC STRENGTH TEST
The testing vessel and electrodes shall be cleaned, dried, and then rinsed with a little
of the insulating oil that is to be tested.
2. Take a sample of the insulating oil from the transformer, etc.
Do not uncork the sample until its temperature equals the ambient temperature of the
test area.
3. Maintain the ambient temperature during the test at 15-35 deg. C.
4. Fill the testing vessel with the sample and wait approximately 3 minutes,
until the oil bubbles have disappeared.
5. Increase the test voltage by 3kV per second until a breakdown occurs.
6. Repeat the procedure five times while the sample is in the testing vessel
and record the results.
7. Complete an insulation oil test data sheet for every test.
The breakdown voltage of the insulating oil shall be determined by calculating the
arithmetical average of the five breakdown voltages recorded (the first breakdown
voltages recorded are not used in the calculation).
5.9 Current Transformer Test
1. Polarity Check (Kick Test)
Each current transformer shall be individually tested to verify that the primary and
secondary polarity markings are correct. A low voltage battery is used, via a single-
pole push-button switch to energize the primary winding.
When polarity are as shown below, on closing the push-button, the d.c. ammeter
should give a positive flick and on opening, a negative flick.
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Figure - 9
“TEST CIRCUIT”
2. Ratio Test (Primary Injection Test)
a. This check is usually carried out during the primary injection test. The
circuit shall be as shown in figure 10.
b. Current is passed through the primary conductors and is measured on
the test set ammeter (A1).
c. The secondary current is measured on the ammeter (A2) and the ratio
of the reading on A1 to that on A2 should approximate to the ratio marked on the
switchgear to be applied with Primary Injection Test.
d. Connect injection leads on the primary circuit of CT using primary
junction device.
e. Check the secondary terminals by a temporary wire.
f. Confirm other CT secondary loop is complete, if not, short the CT
secondary terminals by a temporary wire.
g. Inject the current as same value of CT primary (as possible) and
confirm the CT ratio measuring the CT’s secondary current.
h. Record the test results and complete the test report.
Figure 10
“MEASURE CT RATIO (PRIMARY INJECTION)”
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5.10Voltage Transformer Test
1. Polarity Check (Kick Test)
a. The voltage transformer polarity can be checked with the test described for the
current transformers.
b. Care must be taken to connect the battery supply to the primary winding, with the
polarity ammeter connected to the secondary winding.
5.11Interlocks and Control Test
With the switchgear control power energized, each circuit breaker position shall be
checked, and then checked again in the operating position, according to the following
procedure:
1. Close the circuit breaker and trip it from the control switch and remote
control panel.
2. Mechanically trip each electrically operated circuit breaker.
3. Test the lockout device in the closing circuit for proper operation by
simulating conditions in which a lockout would occur.
4. Complete a sequence test data sheet for every test.
5.12Protective Relay Test
1. Protective relay shall be tested in accordance with relay Manufacturer’s
manual.
2. Input current and/or voltage of the set tap value of protective relay and
confirm the relay to pick-up.
3. Primary injection test shall be applied where necessary i.e. for bus-zone
protection.
To understand the test procedure, refer to the following sample of the protective relay
test.
5.12.1 Inverse - Time Relay Calibration and Test
1. Using a relay tester with a third harmonic filter, set the relay
in accordance with the Relay Setting List.
2. Connect one relay unit to the relay tester.
3. The minimum pickup current input to the relay and the calibration of
the relay shall be tested as follows:
a. Rotate the armature disk by hand to the midpoint of its full travel. Mark
a red target line between the disk and a stationary part.
b. Increase the input current to the set tap value and monitor the
armature disk to determine when it starts to rotate.
c. If the disk does not start rotating at the set tap current, increase the
current slightly.
d. Check that when the disk stops, the red lines coincide. If not, adjust
the tension in the spring accordingly.
4. Operational Test.
a. Set the input current at 300% of the set tap value.
b. Set the cycle counter and input the 300% current through the relay coil.
Measure the duration of operation.
c. Repeat the procedure with a 600% tap current.
5. Complete the Relay Setting List for every item of test data.
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5.12.2 Instantaneous Relay Test
1. Set the relay in accordance with the Relay Setting List.
2. Set the input current at the set tap value and confirm that
there is current between the relay and pickup.
3. Complete the Relay Setting List for every item of test data.
5.13Dielectric Absorption Test
1. The procedure for this test shall be the same as that for the insulation resistance test.
2. For motors and generators rated below 1,100 kW, take readings at 30 and 60
second intervals to determine the dielectric absorption ratio.
3. For motors and generators of l,l00kW and larger, take readings at one minute and
10 minute intervals to determine the polarization index.
4. Calculate the ratios from the following formulas:
1. Dielectric absorption ratio = 60 second reading
30 second reading
2. Polarization index = 10 minute reading
1 minute reading
5. Depending on the type of test, complete a dielectric absorption ratio data sheet or a
polarization index data sheet, for every test.
5.14Lighting Circuit Test
After satisfactory insulation resistance values have been obtained, the lighting circuit shall
be tested according to the following procedure:
1. Turn off all the branch circuit switches in the lighting panel.
2. Energize the distribution circuit up to the lighting panel.
3. Check the voltage between all phases, and between each phase and the neutral
conductor, at the buses to the lighting panel.
4. Turn on one branch circuit switch and check that the illuminated lighting is in
accordance with the lighting drawing.
5. Check all the branch circuits one by one, using the same procedure.
6. Complete a lighting circuit test data sheet and an illumination level data sheet for
every test.
5.15Electrical Distribution System Phase Rotation Check and Polarity Test
1. Before energizing the electrical panel by permanent power, phase rotation and
polarity shall be checked by using the temporary low voltage power.
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2. Complete a phase rotation and polarity test data sheet for every test.
5.16Running Test of Motor Uncoupled
All tests and inspections of the motor, such as visual inspections, insulation resistance
measurements, and sequence checks, shall be completed before making a motor no-
load run test. Other checks to be performed are as follows:
1. Check that the motor can be easily turned over by hand.
2. Ensure that the coupling is correctly aligned and the motor is fixed to its
foundation.
3. Using the starter, rotate each motor to check that it rotates in the direction
indicated by the rotation arrow. If not, reverse the connection leads at the starter, or
at the motor if necessary.
Run the motor uncoupled until the motor tempera-ture reaches the saturation point.
4. Check the vibration, noise, and bearing tempera-ture. Use a thermometer
to check and record the bearing temperature. Do not try and determine the
temperature by feeling the bearing housing. Defective bearings will be discovered by
their being noisy or by their overheating.
5. Complete a motor uncoupled run test data sheet for every test.
Note: Motors with special construction or fractional capacity shall be individually
discussed and decided before the test.
6.0 ACCEPTANCE CRITERIA
This section defines the acceptance criteria of site test, which shall be used for evaluation of
measured values. The acceptance value of each test item shall be referred to a list as follows:
No. Description of Test Test Equipment & Tolls Test Voltage &
Duration
Min Acceptance
Value
1 Grounding Resistance
Measurement
Grounding Rod
Lightning Earth Rod
Ground. System Network
Instrument Grounding
Ground. Resistance Tester
Below 25 Ohm
Below 10 Ohm
Below 1 Ohm
2
2.1
2.2
2.3
Power Transformer
a) Control Circuit
b) LV below 1KV
c) HV above 1KV
Insulation Oil Test
Continuity Test
a) Primary Winding
500V Megger
1000V Megger
2500V Megger
AC Dielectric Test set
Circuit Tester
30KV
1M Ohm
5M Ohm
50M Ohm
Page 19 Updated – 19/04/2012

2.4
b) Secondary Winding
c) Neutral Grounding
d) Equipment Grounding
Polarity Test
Circuit Tester
Circuit Tester
Circuit Tester
Duration
Min Acceptance
Value
3
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
Switchgear & Controlgear
and Panelboard
a) Control Circuit
b) LV below 1KV
c) HV above 1KV
Continuity Test
a) Equipment earthing
b) Power circuit
c) Control circuit
Conductivity Test
HV Test (Apply HV above 1
KV)
* 4.16KV
Polarity Test
Protective Relay Test
(by Vendor SV)
Interlocks and Control /
Sequence Check
Phase Rotation Check
Ratio Test
500V Megger
500V/1000V Megger
2500V Megger
Circuit Tester / Buzzer
Contact Resistance
Measurement Tester (Ductor
Tester)
AC Dielectric Test Set
Circuit Tester & Battery
Relay Test Set
supplied by Vendor
Rotation Meter
Primary Injection Test Set
Ammeter
4.16KV x 1.5 (10
mnt)
1M Ohm
5M Ohm
50M Ohm
4
4.1
4.2
4.3
Cables
a) Control Cable
b) LV Cable below 1KV
c) HV Cable above 1KV
HV Test (Apply HV above 1
KV)
From 1KV up to 15KV
Continuity Test
1000V Megger
1000V Megger
2500V Megger
10M Ohm
10M Ohm
100M Ohm
Page 20 Updated – 19/04/2012

Duration
Min Acceptance
Value
5
5.1
5.2
5.3
5.4
Electrical Motor
a) HV Motor
b) LV Motor
c) Space Heater
Vibration Test (Uncoupled)
Running Current (Uncoupled)
Temperature Rise
a) Bearing
b) Frame
2500V Megger
500V/1000V Megger
500V Megger
Vibration Meter
Clamp Multi Meter
Temp. Indicator
Temp. Indicator
50M Ohm
5M Ohm
1M Ohm
6
6.1
6.2
6.3
6.4
6.5
Lighting
Circuit Continuity
Circuit Voltage Check
Function Test
Illumination Level Check
500V Megger
Circuit Tester
Lux Meter
1M Ohm
7
7.1
7.2
7.3
Power & Convenience Outlets
Circuit Continuity
Polarity Test
500V Megger
Circuit Tester
5M Ohm
Page 21 Updated – 19/04/2012

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