Contents
1 PURPOSE
2 SCOPE
3 REFERENCE, CODE &
STANDARD
4 DEFINITIONS
5 RESPONSIBILITY
AND AUTHORITY
6 WORK PROCEDURE
8 SAFETY
9 QUALITY CONTROL
1 PURPOSE
The purpose of this procedure is to specify
responsibilities and describe the steps 33kV Cable High Voltage Test.
2 SCOPE
This method
statement describes and performance of associated HI-POT testing of 1C x 400
Sq.mm 33KV cable. This method statement is intended to cover the basic test set
layout specific to the site and safety conditions required to carry out the
test without posing a danger to personnel and equipment.
This method
statement is not intended to cover the physical connection of the test
equipment nor the actual test procedure.
3 CODE & STANDARD
3.1 Subcontractor document
3.2
Work index, symbol and detailed drawing
3.3 Address the related project specific CODE &
STANDARD.
4 DEFINITIONS
4.1 Within this document following
definitions shall apply.
OWNER / COMPANY United Steel Company (Kingdom of
Bahrain)
CONTRACTOR Samsung
Engineering Company Limited (SECL)
SUBCONTRACTOR
PROJECT SULB
Steel Mill Project (Kingdom of Bahrain)
5 RESPONSIBILITY AND
AUTHORITY
5.1 Site Manager
5.1.1
Site manager bears the responsibility
and authority on work and quality related to this method statement.
51.2
Site manager approves work plans.
5.2 Construction
Superintendent
5.2.1 A construction Superintendent bears the
responsibility and authority to train their staff and subcontractor’s
after preparing work plan according to this method statement.
5.2.2 A construction team manager takes the
responsibility of all temporary electrical work execution and preparation.
5.3 Construction
Supervisor
5.3.1 Construction Supervisor shall execute
inspections and tests to secure quality materials, take adequate measures,
manage results as quality records, and utilize checklist.
5.3.2 Construction supervisor bears the
responsibility of installing cable tray according to the dimensions specified
in specifications or drawings, and submits reports to the owner for approval
5.4 Quality Manager
5.4.1
Site Quality Manager is responsible for
management and supervision of implementing inspection work as specified in this
method statement.
5.4.2
Inspection request to QC when portions
of the work are ready for inspection, as depicted in the ITP’s.
5.4.3
Responsible for preservation and
maintenance of equipment at site.
6 WORKING
PROCEDURE
6.1 Sheath
Test
6.1.1 Performing DC sheath test by applying 10kV
to Metallic sheath against Ground for 5 Minute.
6.2 Link Box
Installation and Testing.
6.1.1 Link Box installation near of 33KV connection
point.
6.1.2
Link Box bonding cable size 1Cx95mm2.
6.1.3 Link Box shall be two ground cables provide
1Cx120mm2.
6.1.4 Link Box Installation height shall be 1500mm
from floor to link box center point.
6.1.5 Bonding cable Insulation resistance test by
DC 5kV Voltage.
6.1.6 SVL Insulation resistance test by DC 1kV
Voltage.
6.1.7 Link box contact resistance test at each
phase and earthling connection.
6.3 AC High Voltage Test
& Insulation Resistance Test
6.3.1 The test set will be connected from 33kV GIS
panel side through a suitable test busing. At the far end of the circuit the
cables are terminated at SULB substation, during execution all necessary safety
procedures to be followed for a smooth working environment.
6.3.2 In
live condition. Only the test engineer will be allowed into the test area
marked out by the warning tapes, this will be stressed to the watchmen and no
personnel on the site will be allowed inside the test area regardless of their
status.
6.3.3 Once the test set and
test object have been connected the test engineer will recheck the safety
barriers and ensure watchmen are positioned. The test set ground will be
removed and the cable and test system should now be considered live. The test set wills
then energies the test object as per the Clients requirements. In the event of
no specific client requirements SECL advice to raise the test voltage to 33kV
and hold for enough time to allow the test engineer to inspect the test lead
and test object, then raised to the full test voltage. This method allows the
test engineer to ensure the set is correctly connected and the clearance from live
components and earth is sufficient to avoid a flash over.
6.3.4 Performing
Insulation resistance test to be done before and after high voltage test, it’s
done between conductor and ground applied DC 5kV 1 minute.
6.3.5 AC
voltage 33KV Applied for 5 minute to conductor with corresponding sheath earth,
and recording the leakage current after full voltage applied. No break down or
excessive leakage current. Before performing theses tests following condition
have to be applied.
7 QUALITY
CONTROL
7.1 ITP is a document submitted to the owner
or owner’s representative formulated in an orderly manner by the
construction supervisor or site quality manager to record main working
processes for tests and quality inspections, and to enable the owner or owner’s
representative to assign inspection points.
7.2 Witness Point
7.2.1 Point
where permission to the next level is granted without Owner’s agreement.
7.3
Hold Point
7.3.1 Point where further progress is not allowed
without Owner’s written permission
7.4 Inspector
7.4.1 Person that inspects whether processes
quality of materials or specifications are consistent with prescribed or
desired requisites.
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