SCECO CENTRAL TRANSMISSION DEPARTMENT
STANDARD PROCEDURE
1 2 3 4a 4b 5 6 INDEX NUMBER DATE OF ISSUE P&T66/nars T/P&T 65820 235 / 62 99 Ro 2 JUNE 1994 TITLE:GUIDE LINES TO SITE PRE-COMMISSIONING TESTS
AT NEW SUBSTATION
PREPARED BY:
ENGR. MUKHTAR
ENGINEER
CONCURRED BY: APPROVED BY:
SALEH AL-GHUNAIMI ABDUL RAHMAN A. AL-BASSAM
SCECO CENTRAL
TRANSMISSION DEPARTMENT
DISTRIBUTION OF STANDARD PROCEDURESL O C A T I O N D A T E
HEAD OFFICE DISTRIBUTION DEPARTMENT HEAD OFFICE TECHNICAL STUDIES
AL QASEEM AL-AFLAG AL-DAWASIR AL-KHARJ SUB STATIONS OPERATIONS NETWORK
PROTECTION AND TESTING
PROGRAMMING AND RESOURCES
SCECO (CENTRAL)
TRANSMISSION DEPARTMENT
STANDARD PROCEDURE
1.0 INTRODUCTION:
1.1 PURPOSE
All electrical equipment installed in newly build substation is necessary to test and inspect according to the site test procedure being presented here.
1.2 OBJECTIVES
To keep the contractors testing work in line with SCECO requirements, so that no equipment is left unchecked before energization.
1.3 APPLICATION
Contractors and SCECO witnessing staff should follow the attached guide line for precommissioning tests so that no test is forgotten and equipment remained unchecked. The guide line specifies all kinds of site test to be performed on most of the S/S equipment meant for transmission of electrical power.
GUIDE LINE TO SITE PRE-COMMISSIONING
TESTS AT NEW SUBSTATION
For newly being built Substation by Contractors under Turnkey Projects or extension to existing Network. Following Site Pre-Commissioning Tests should be performed by the Contractor regarding specified equipment as under:
SERIAL
NUMBER TEST OBJECT
TEST
NO. TEST DESCRIPTION
a. Phasing & Continuity check. b. 2kV Megger test.
1.
Lv power cables
c. Visual inspection, size & ratings confirmation
a. Main Circuit Continuity test for tightness of Joints and bolts.
b. Main circuit insulation Resistance Measurement by 2kV Megger or 2kV A.C.H.V. Test for one minute.
2. Lv switch, switch gear
c. Phasing check.
a. Visual inspection of ratings as per drawings.
b. 2, 3 time ON/OFF hand operation. 3. Mcbs in lv ac
panels control & protection panels of all voltage ratings
c. Trip test in each Phase by over current injection and noting the Trip time.
a. All Ammeters and Volt Meters should be Calibrated at 20%, 50% & 100% of FSD. b. All C.Ts to be checked for ratio test at
least.
c. All selector switches should be checked for R, Y, B & N position and its labels.
4. Meters in lv panels
d. All secondary wiring to be Meggerred.
SERIAL
NUMBER TEST OBJECT
TEST
NO. TEST DESCRIPTION
a. Main circuit resistance Measurement including ciucuit breakers and check against Factory test results.
b. A.C. H.V. Test for the Main Circuit with Circuit Breaker in close position and then open position also.
c. All Voltage transformers tobe checked for insulation resistance winding resistance, Ratio Polarity and A.C. H.V. Test at 1.5 Un at no burden.
d. All 13.8kV panel meters like Ampere Amp MDIS, KV, MW, Mvar, Transducers e+ to be calibrated.
e. All relevant C.Ts should be checked for Mag. curve ratio polarity.
f. For Secondary wiring 1kV Megger Test. g. Phasing check for V.T. Secondary Circuits
on relevant meters.
h. All MCBs AC/DC in the panel to be checked.
5.
13.8/33KV
SWITCHGEAR
i. Check against drawings Contract Spec-Specification, the Instrument & Equipment ratings.
SERIAL
NUMBER TEST OBJECT
TEST
NO. TEST DESCRIPTION
n. Fan Motors current to be Measured and check against rating also check wiring size suitable to carry the currents.
o. MCBs in Cooler Control Cubical to be checked by current injection for trip test. p. Check oil level in main tank tap changer
tank, Bushing etc. Test the oil level gauges and its alarms.
q. Check earthing of Transformer wheel stopper, silica gel color blue etc.
r. Check wiring size of Supply Cable of Fans Motors and Main MCBs and incoming cable. Run all Fans together and then measure current in all wires of Fan Motors and input supply cables. Check no temperature arises on the Supply Wires. Check Main MCCB in L.V. Distribution Panel is of correct rating to Supply the Transformer auxiliaries.
s. Labelling:
All auxiliary devices to be labelled as shown in relevant drawing and actual name should be written on the labels like Oil Temp. Gauge, Winding Temp. Gauge, pressure relief valve etc.
All Cable should be marked R, Y, B in big letters on H.V. side and small letter on L.V. side.
t. Name plate data should be complete and installed at Mains light visible place. 6. P/transformer
switchgear
u. Check for oil leakage, radiator valves open position, Colour of Transf. or any bending of body. Oil pockets of Thermosens of Gauges, have oil inside etc.
NUMBER NO.
a. Ratio Test and Megger Test 5kV on H.V. Side and 1kV at L.V. side.
b. Vector group Test. c. Return to normal Tap.
d. Check against Contract Specification. e. Check oil level and its indication alarms.
f. Check oil temperature gauge by actual heating process and its alarms.
g. Check L.V. Side MCB Setting as per Transformer rating 20% above check its on off.
h. Check all devices labelled correctly as per drawing.
i. Check oil level in H.V. Side Cable box and its oil level indicator.
7. Auxiliary transformer
j. Check earthing, Colour, Painting external damage, oil leakage, wheel stopper, cable connection etc.
a. Megger Test.
b. Resistance Measurement. 8. Neutral earthing
resistors
c. Inside visual inspection for any insulator broken.
a. Sheath Meggering & Continuity Test b. Megger Test for Cable Cores. c. Phasing Test.
9. 13.8kv & 33kv power cable
d. H.V. Test. a. Oil Flow Test. b. Impregnation Test.
c. Conductor Resistance Test. d. Capacitance Test.
e. Sheath Meggering. 10. 132kv cables oil
filled cables
f. Cross bonding Test. CH3D/nars
g. Tightness oflinks in J/Boxes. h. Test for S.V.L.
10. 132kv cables oil filled cables
i. High Voltage Test. a. Megger Test.
b. Conductor Resistance, Capacitance and Inductance Test.
c. Sheath JR Test. d. Cross Bonding Test. e. Link box tightness check. f. S.V.L. Test.
11. 132kv xlpe cables
g. H.V. Test.
a. A.C. high voltage test on Main Circuit with Partial Discharge Measurement.
b. Main Circuit Resistance Test. c. Megger Test on Auxiliary Circuits. d. SF6 Leakage Test.
e. Measurement of SF6 Moisture Contents. f. Checks and verification against approved
Specification.
g. C.Bs Timing Test (Open & Close). h. Checks on SF6 gas pressure gauge.
i. Checks on C.B. hydraulic system.
j. G.I.S. V.Ts Test for Meggering, Ratio Polarity, Winding Resistance and 1.5 Un H.V. Test.
k. All MCBs A.C. and D.C. to be tested in its Control Cubicle.
l. V.Ts Secondary MCB Test & Phasing Check.
12. 132kv 380kv 220 kv g.i.s.
m. G.I.S. Earthing, Paint, any external damage, etc. check.
a. Megger Test.
b. Loop Resistance Test.
c. Cross Talk Test and Coupling Test. 13. Pilot cables
d. Noise Level Measurement. a. Megger Test.
b. Winding Test
.
c. Ratio Test. d. Polarity Test.
e. H.V. Test with P.D. Test upto 1.5 Un only. 14. Voltage transformers
13.8kv, 33kv, 132kv, 220kv, 380kv rating
f. Secondary circuit MCBs Test and Phasing Checks.
a. For indicating Meters:
Voltage or current to be injected at 25%, 50%, 100%, of FSD
.
b. Precision ref. meters should be used for calibration checks.
15. Measurands
c. For integrating Meters. Time power Meters along with precision REF. Energy Meters to be used to check KWH Meters.