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Ensuring Reliability:

In-house Relay Testing at STC Department

Kochi Metro's signaling system relies on Q-series relays for seamless

communication between field circuits and smart IO equipment.

However, as these relays age and stored replacements accumulate

shelf time, their functionality needs verification before deployment. To

address this, Kochi Metro's engineers have developed an ingenious in-

house solution – a relay test jig.

This custom-designed device

allows technicians to

thoroughly assess each relay's

performance before integration

into the system. The testing

process evaluates critical

parameters such as maximum

pick-up voltage (the minimum

voltage required to activate the

relay), minimum drop-away

voltage (the voltage at which
the relay deactivates), and

contact make/break

functionality (ensuring proper

circuit opening and closing).

Following each test, a detailed

report is generated, providing

a clear picture of the relay's

health.

This in-house relay test jig guarantees the reliability and safety of their

signaling system. By meticulously testing each relay before deployment,

they minimize the risk of malfunctions.