Central Power Research Institute, India

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Prof.Sir.C.V.Raman Road, P.B.No: 8066, Sadashivanagar P.O
Bengaluru, Karnataka, 560080

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Key Contact Personnel:
V.S. Nandakumar, Director General dgcpri@cpri.in
M.K.Wadhwani, Additional Director wadhwani@cpri.in
Sudhakara Reddy.S, Additional Director ssreddy@cpri.in
Dr. Pradeep M Nirgude, Additional Director pmnirgude@cpri.in
S.Shyam Sundar, Joint Director shyamsundar@cpri.in
G.Pandian, Joint Director gpandian@cpri.in
Meena.K.P, Joint Director meena@cpri.in
Manoj Kumar Jaiswal, Joint Director jaiswal@cpri.in

Year Founded:
• High Voltage Division (HV), Bengaluru: 1970
• High Power Laboratory (HPL), Bengaluru: 1990
• Cables & Diagnostics Division (CDD), Bengaluru: 2010
• Switchgear Testing & Development Station (STDS), Bhopal: 1960
• Ultra High Voltage Research Laboratory (UHVRL), Hyderabad: 1993
• Regional Testing Laboratory (RTL), Noida: 2009
Total Number of Employees: 467
Major Export Markets Served: Countries of Middle East / Far East / South East Asia, USA, Europe, Russia, Africa, SAARC.
Product Certification:
CPRI is accredited by National Accreditation Board for Certifying Bodies (NABCB) for certification of electrical equipment as per ISO/IEC 17065: 2012 for Type 1a scheme. CPRI can offer Certification for its Test Reports covering Transformers & Reactors, Cables and cable accessories, Capacitors, Switchgear & Control gear, Microgeneration, Transmission line accessories and Energy meters.


High Voltage Laboratory

Number of Employees:

• HV, Bengaluru: 17
• UHV Research Laboratory, Hyderabad: 42
• STDS, Bhopal: 9
• RTL, Noida: 10
• CDD, Bengaluru: 14

Dimensions of Main Test Halls:
• HV, Bengaluru: 54 m length x 52 m width x 42 m height
• HV, Impulse Current Laboratory, Bengaluru: 33 m length x 13 m width x 6 m height
UHV Research laboratory, Hyderabad: Impulse Test Bay: 2080 sq. m
– Power Frequency Test Bay: 600 sq. m
– DC Test Bay: 1600 sq. m
– Indoor Shielded Laboratory: 50m length x 35m width x 35 m height
STDS, Bhopal: 28m length x 24m width x 26m height
RTL, Noida: 23m length x 15m width x 7.5m height

Dimensions of Secondary Test Halls:
HV, Bengaluru: Outdoor 55 m x 55 m
UHV Research Laboratory, Hyderabad: Auxiliary Test Bay: 385 sq.m
CDD, Bengaluru: Indoor Lab 35m length x 25m breadth x 16m height
Outdoor test bay: 100m x 50m

Dielectric Testing Facilities:

Impulse Testing: Max. Volt./Current Standard
Lightning Impulse 3 MV, 150 kJ(HV, Bengaluru)
2.4MV, 240kJ (STDS, Bhopal)
5 MV, 500 kJ (UHVRL, Hyderabad)
2.4MV, 240kJ (CDD, Bengaluru)
1MV, 100kJ (RTL, Noida)
Switching Impulse (Dry) 1.6 MV (HV, Bengaluru)
3.2 MV (UHVRL, Hyderabad)
1.5 MV (STDS, Bhopal)
Switching Impulse (Wet) 1.6 MV (HV, Bengaluru)
3.2 MV (UHVRL, Hyderabad)
Current Impulse 100 kV, 300 kJ(HV, Bengaluru) IEC 60099-4, IEC 60099-8,
IEEE C-62-11:2020 &
IS 15086-4
A.C. Testing:
Dry & Wet 1100 kV (HV, Bengaluru)
1600 kV (rms)(UHVRL, Hyderabad)
350 kV (rms) (STDS, Bhopal)
200 kV (rms) (RTL, Noida)
Wet 1100 kV (rms) (HV, Bengaluru)
1600 kV (rms) (UHVRL, Hyderabad)
350 kV (rms) (STDS, Bhopal)
200 kV (rms) (RTL, Noida)
D.C. Testing:
Dry +/- 1200 kV / 200 mA(UHVRL, Hyderabad)
+/- 320kV / 15mA (HV, Bengaluru)
Wet +/- 1200 kV / 200 mA(UHVRL, Hyderabad)
Partial Discharge & RIV Testing:
1200 kV (AC), +/- 1200 kV (DC)(UHVRL, Hyderabad)
400 kV AC (HV, Bengaluru) – RIV Test
100 kV (AC) (RTL, Noida) – PD Test
Capacitance & Tan ∂ Testing:
1200 kV (AC) (UHVRL, Hyderabad)
100 kV (AC) (RTL, Noida)
±1200 kV (AC) (UHVRL, Hyderabad)
±1200 kV (DC) (UHVRL, Hyderabad)
400 kV (AC) (HV, Bengaluru)

Pollution Testing:

Dimension of Main Test Chambers: HV, Bengaluru: 12m length x 12m width x 12m height
UHVRL, Hyderabad: 24 m (diameter) x 27 m (height) with 800 kV wall bushings

Standard Max.A.C. Volt Max.D.C. Volt Temperature
Salt Fog IEC 60507 800 kV AC System (UHVRL, Hyderabad)
IEC 60507 400 kV AC System (HV, Bengaluru)  —
Solid Layer IEC TS 61245  — +/- 800kV (UHVRL, Hyderabad)
Clean Fog IEC 60507 132 kV System (HV, Bengaluru) Ambient
IEC 60507, IEC TS 61245 765 kV System (UHVRL, Hyderabad) 800 kV (UHVRL, Hyderabad)

Ageing Tests: 1000 hrs Salt Fog Ageing Tests, Ageing Tests on Arrester Blocks

Other Testing Facilities

Max. Voltage Max. Power Frequency Standard
Transformer Testing (HV, Bengaluru)
Single Phase 400 kV 100 MVA 50 Hz IEC, BIS, ANSI
Three Phase 400 kV 100 MVA 50 Hz IEC, BIS, ANSI
Transformer Testing (UHVRL, Hyderabad)
Single Phase 1200 kV 500 MVA 50 Hz IEC, BIS, ANSI
Three Phase 1200 kV 500 MVA 50 Hz IEC, BIS, ANSI
Transformer Testing (RTL, Noida)
Single Phase 11kV 1 MVA 50 Hz IEC, BIS, ANSI
Three Phase 11kV 1 MVA 50 Hz IEC, BIS, ANSI

HV Cable Testing:

Max. Volt./Current Standard/Remarks
Load Cycling Up to 400 kV Cables IEC, VDE, BIS
AC Voltage 400 kV Class Cable (CDD, Bengaluru)
33kV Class Cable (RTL, Noida)
DC Voltage 33kV Class Cable (CDD, Bengaluru
& RTL, Noida)
Lightning Impulse Up to 400kV Class (CDD, Bengaluru) IEC, CENELEC, VDE, BIS
33kV Class Cable (RTL, Noida) IEC, BIS
Switching Impulse 145 kV and 245 kV (HV, Bengaluru)
400kV (CDD, Bengaluru)
Test Loop Length: 30m Type Test loop (CDD, Bengaluru)
100 metres (Pre-qualification test)
15m Type Test (RTL, Noida)



High Power Laboratory

Total Number of Employees:
HPL, Bengaluru: 30
STDS, Bhopal: 23

HPL, Bengaluru:

• Possible Power Frequency: 50/60 Hz
• MVA: 2500, 14kV, 120 kA Short Circuit Generator
• kV: 336 kV Single Phase, 72.5 kV Three Phase
• kA & Duration: 300 kArms STC for 1 sec.
• kV: 400 kV DC Synthetic installation
• Synthetic Installation: 245kV Circuit Breaker, 63kA – Full Pole Testing, 400 kV Circuit Breaker – Unit Testing

STDS, Bhopal:
Possible Power Frequency: 50Hz
• MVA: Two Nos. of 1500 MVA Short Circuit Generators, 100 MVA Grid Sourced lab
• kA & Duration: 200 kA STC for 1 sec.

Electrical Tests

Medium Voltage Tests: Up to 36 kV Circuit Breakers-26.3 kA (HPL, Bengaluru), upto 12kV, 50kA Circuit Breakers (STDS, Bhopal)

Power Transformers up to 250 MVA and voltage rating 220 kV class, up to 120 MVA and voltage rating 400 kV Class (HPL, Bengaluru), Power Arc Test on insulator strings up to 40 kA for voltage class up to 400kV.

Power Transformers upto 63MVA and voltage rating 220kV class (STDS, Bhopal).

Other Types of High Power Tests Offered:

Short Time current Test on Reactors, Line Traps, Disconnector & Earthing Switches, Pressure Relief Tests on Lightning Arresters, Breaking Capacity Test on Fuses, Induced Current Switching Tests on High Voltage Earthing Switches. Internal Arc Tests on Panels & Package Substation, Internal Arc Tests on Instrument Transformers, Low Induction current switching Tests, Breaking Capacity Tests on OLTC, all tests on LV Switchgears as per IEC 61439-1 & 2. Mechanical Operation test on Circuit Breakers.

Other Test Capabilities: 

Testing of Transmission Line Towers; Overhead Conductors and Accessories; Seismic Qualification Tests; Testing of Power Capacitors, APFC Panels and Environmental Tests; Conformance Protocol Testing in accordance with IEC 61850, Testing of Solar Products like Grid Tied Inverters, LED’s, Solar PV modules; State-of-art Real Time Digital Simulator; Comprehensive test facilities for Energymeters, Transformer Oil.