TECHNICAL SPECIFICATION FOR LOW TENSION (FIXED) SHUNT CAPACITOR UNITS (MPP TYPE) FOR DISTRIBUTION TRANSFORMERS Spec. No. MSEDCL/Dist:MSC-III/ LT MPP CAP/11/2009/R0
A. C. Voltage Test between Terminals and Container
Thermal Stability Test
Capacitor Loss Tangent (Tanδ) measurement at elevated temperature.
Self healing test
Lightning Impulse Voltage Test between Terminals & Container
Short Circuit Discharge Test.
In addition to the above following Special tests as per amendment 1 to IS:13340/ 1993 shall be carried out & submitted for approval.
The tenderer shall furnish copies of type test reports as per relevant, IS, or the confirmatory tests as per the equivalent international standard as the case may be, for the equipments material offered along with the tender. The tenderer should note that the offers received without type test reports shall stand rejected.
The equipment offered shall be fully type tested as per the relevant standards for all the type tests specified in the IS at the testing laboratories accredited by National Accreditation Board of Testing and Calibration Laboratories (NABL). The offered equipments should be type tested prior to maximum five years before the date of opening of tender. In case the Tender is not accompanied by the type test Certificates Board reserves the right of cancel / reject the Tender.
All the tests specified at Clause 12.3.1 of IS: 13340/1993 (with latest amendments) for MPP type capacitors shall constitute the acceptance tests as follows.
Test for output and capacitance
Capacitor loss tangent (tan delta) measurement.
Insulation Resistance Test.
A. C. Voltage test between terminals
A. C. Voltage test between terminals & container.
Test for discharge device.
Sampling plan shall be as per Annex ‘F’ Clause 12.3 table 5 of IS: 13340/1993. The same is reproduced bellow.
SAMPLE SIZE & PERMISSIBLE NUMBER OF DEFECTIVES
Permissible no. of defectives
Up to 100
101 to 300
301 to 500
501 to 1000
1001 and above
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Seal and Signature of Tenderer