GPRI
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Electrical Tests on Products and Components as per NABL Accreditation, Mechanical Tests on Products and Components as per NABL Accreditation
Our Services

GPRI can currently provide services for a variety of products such as Insulators. Isolators, Transformers, CTs, PTs, Lightning Arresters, On load tap changers, Cables, Insulation Materials, & Transmission line conductors and hardware. Presently it is NABL accredited to evaluate the products as per relevent Indian and International Standars or as per customer requirements.

The list below provides the tests GPRI can carryout presently with NABL accredited facilites. GPRI is constantly striving to enhance its services, and the customers may kindly contact GPRI for any test requirements on products that are not listed below

GPRI can undertake developmental tests using its special facilities and issue developmental test report for any product or raw material. It can also provide raw material inspection and evaluation at the customers’ premises, or at utility stations based on customer requirements.
Electrical Tests on Products and Components as per NABL Accreditation
 
Sl.No. Group of products, materials or components that can be tested Specific tests or types of tests performed & Range of testing
Standard Specifications
Indian Standard IS
International Standard IEC
1.

Insulators (Disc /Pin / Guy Strain & shackle Insulators Up to 33kV system)

Post Insulators/Long rod or disc insulators upto 400 kV

String (all types) all voltage class

Composite Insulators upto 400 kV system

Hard ware fittings & Aluminum Conductors up to 400kV system

 Power frequency voltage withstand test (Dry/Wet) Up to 800 kV (rms) 731 (1971) (RA:2006)
2544 (1973) (RA:2006)
2071-1 (1993) (RA:2009)
2071-2 (1974) (RA:2006)
8263 (1976) (RA:2009)
8269 (1976) (RA:2009)
1445-1977 (RA:2009)
5300-1969 (RA:2009)
2486-4 (1981) (RA:2006)
398 -1995
2099-II-1986		 60168 (2001)
60383 (1993)
60060-1 (1992)
60060-2 (2000)
60437 (1997)
61109-2008
62217-2012
61284-1997
60506-1975
Power frequency voltage flashover test (Dry/Wet) Up to 800 kV (rms)
Lightning impulse withstand test (Dry) Up to 2000 kV (Peak)
Lightning impulse 50% flashover test (Dry) Up to 2000 kV (Peak)
Switching impulse voltage withstand test (Dry/Wet) Up to 1200 kV (Peak)
RIV Test Up to 420 kV (rms)
Visible corona test Up to 420 kV (rms)
Puncture test
Corona inception extinction Up to 800 kV (rms)

PGCIL (Annexure-A Section-III(Volume-IIB) Page 22) & NTPC specification (Spec no.CS-9560-572-2,Part-II Section-VI, Page EO-6/8, Clause 4)

Any other test can be undertaken as per customer specification
Voltage distribution test(Dry) Up to 800 kV (rms)
2. Hollow insulators upto 400 kV Electrical Routine Test 5621 (1980) (RA:2009) 62155 (2003)
3. Circuit breakers / Isolators
Up to 400kV		 Power frequency voltage withstand test (Dry/Wet) Up to 800 kV (rms) 9920-1(2002)(RA:2007)
9920-2(2001)(RA:2006)
9920-3(1982) (RA:2007)
9920-4(1985) (RA:2007)
13118 (1991)(RA:2007)
9921-1(1981) (RA:2007)		 62271-1-2007
62271-100 (2008)
62271-102 (2003)
60694 (2002)
60060-1 (1992)
60060-2 (2000)
60437 (1997)
Lightning impulse withstand test (Dry) Up to 2000 kV (Peak)
Switching impulse voltage withstand test (Dry) Up to 1200 kV (Peak)
4. High Voltage Fuses
Up to 33kV System		 Power frequency voltage withstand test (Dry/Wet) Up to 800 kV (rms) 2071-1 (1993) (RA:2009)
2071-2 (1974) (RA:2006)
9385-1(1979)
9385-2(1980)
9385-3(1980)		 60060-1 (1992)
60060-2 (2000)
60282-1 (2005)
60282-2 (1997)
Lightning impulse withstand test (Dry) Up to 2000 kV (Peak)
Any test on any product other than those mentioned above can be conducted at GPRI based on customer requirements.
 
Mechanical Tests on Products and Components as per NABL Accreditation
 
Sl.No. Group of products, materials or components that can be tested Specific tests or types of tests performed & Range of testing
Standard Specifications
Indian Standard IS
International Standard IEC
1.

Insulators
Disc (Ball & Socket)
(Tongue & Cleaves)

Long Rods insulators, Disc Insulator String, Post Insulators,Hollow insulators,
Composite Insulators.

Guy, Strain & Shackle Insulators (with and without hard ware)

 Visual Examination 731 -1971 (RA-2006)
2544 -1973 (RA-2006)
5621 -1980 (RA-2009)
2633 -1986 (RA-1998)
5300 -1969 (RA-2009)
1445 -1977 (RA-2009)

 

 60383 -1993
60168 -2001
62155 -2003
61109 -2008
62217 -2005
60575 - 1977
Verification of Dimensions
Up to 300mm
Up to 5m
Thermal Mechanical performance test
Up to 190kN
Temperature cycle test
4 to 85 Deg C
24 hour mechanical strength test (Disc)
Up to 980 kN
Electro mechanical failing load test (Type B Insulator) Up to 980 kN and 60kV
Porosity test
Galvanizing test (Uniformity of Zinc Coating)
Verification of specified mechanical load test
(Polymer Insulator)
Up to 980 kN
Mechanical performance test (Disc)
Up to 980 kN
Mechanical Failing load test
Up to 980 kN
Tensile Test
Up to 980 kN
Compression test
Up to 980 kN
Torsion test
Up to 20 kN.m
Bending test
Up to 15 kN
2. Hard ware &
Metal fittings		 Visual Examination 2486-I -1993 (RA-2008) 61284 -1994
Verification of Dimensions
Up to 300mm
Up to 5m
Mechanical strength test
Up to 980kN
Any test on any product other than those mentioned above can be conducted at GPRI based on customer requirements