Relay Testing Laboratory

The laboratory is accredited by NABL and conforms to ISO/IEC 17025:2017 requirements. CPRI has established comprehensive test facility for Power System Protection Relays/Intelligent Electronic Devices (IEDs). The Relay Testing Laboratory is equipped with computerised relay test system for carrying out functional testing for accuracy and operating characteristics. Additional software is available for Dynamic/ Transient testing with import of waveforms from EMTP simulation & Digital Fault Recorder is also possible. Specialised software is also available for GPS synchronised End-To-End testing of Distance Protection Schemes.

Power System Protection Relay is an intelligent electronic device nowadays, which maintains the power system reliability & security and gives an output when abnormal condition occurs in the power system. Tests are conducted on Power system protection relays used to protect Generator, Transformer, Bus bar, Transmission line, Reactor, Motor, Capacitor bank etc., in accordance with National (IS: 3231 series) and International Standards (IEC: 60255 series). Electronic timers are tested as per IS: 5834 standard series. Some of the special tests recommended for Numerical relays like PSB, SOTF and tests with Transient waveforms & Harmonic waveforms are also carried out. The basic objective of the protection relay is to isolate the faulty section in a power system as quickly as possible so that rest of the system functions normally. 

Electromechanical, Static, Digital and Numerical protection relays/Intelligent Electronic Devices can be tested at this laboratory. All types of Protection Relays/IEDs like Distance, Differential, Directional, Overcurrent, Earth fault, Frequency, Synchronising & Power relays etc. can be tested. During Functional testing, protection relays/intelligent electronic devices are made to undergo simulated field conditions to check its performance. Some of the special tests recommended for Numerical protection relays/IEDs like tests with Transient waveforms and harmonic waveforms can also be tested. Facility is extended for Developmental testing.

Protection relay testing at site

Field testing of protection relays/Intelligent Electronic Devices (IEDs) is carried out at the place of installation to check the continued health of the relays deployed in a plant. Field testing have been done for Major power stations, Port trust and Industries like M/s GNDTP-Bathinda, M/s IP-New Delhi, M/s NMPT-Mangalore, M/s HTPS-Kasimpur, M/s VPT-Vizag, M/s BTPS-Bhusawal, M/s PTPS-Panipat, and M/s Ranbaxy Laboratories Lab, Mohali, M/s SGTPP, West Bengal, M/s NHPC-Chutak, Tanakpur & Loktak.

GPS Synchronised End-To-End testing of Distance Protection Schemes

GPS synchronised End-To-End testing of Distance Protection verifies the reliability of communication based protection schemes like PUTT, POTT, DT etc. which link relays of both ends. The faults are created based on the actual system parameters. End-to-End testing is carried out using GPS time synchronized unit & secondary injection kit. Different faults scenario is simulated in order to test the protection system. GPS Synchronised End-To-End testing of Distance Protection Schemes for 220 kV & 400 kV transmission line has been carried out for M/s BBMB, M/s UPPTCL, M/s DTL etc.

Developmental Assistance

The Relay testing/IED testing facility and assistance is also offered for developmental works as a measure to help the manufacturer to improve and ensure their specified functions before arriving at their final product.

Third Party Inspection

The Relay testing lab undertakes pre-dispatch Third Party Inspection (TPI) on Relay/IED and Control panel on behalf of a buyer. The inspection is done at relay manufacturer’s works for M/s HVPNL, Panchkula, M/s RRVPNL, Jaipur and M/s Jammu and Kashmir Power Development-Jammu.