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Overview of transformer differential relays with percentage and harmonic restraint.
Details the STD15C (2-winding) and STD16C (3-winding) relays.
Guidance on selecting CT ratios for optimal sensitivity and avoiding misoperation.
Lists common power and CT connection types.
Provides method for selecting CT turns and relay taps.
Explains calculation of CT burden for performance analysis.
Demonstrates calculation of CT turns and tap settings.
Recalculates CT turns and relay taps based on previous findings.
Details continuous and short-time ratings.
Describes relay response curves and timings.
Explains the trigger mechanism for the overcurrent unit.
Details the restraint from through-current circuits.
Explains the function of harmonic restraint.
Describes the internal CT configurations.
Details the operation of this restraint circuit.
Explains the path of differential current.
Describes the instantaneous overcurrent unit.
Covers the solid-state amplifier and telephone relay.
Explains the target indication mechanism.
Details the relay casing and mounting options.
Checks nameplate and physical condition of the relay.
Verifies smooth operation of internal components.
Recommends initial electrical tests upon receipt.
Outlines pre-service calibration checks.
Describes how to verify the pickup setting.
Details the procedure for adjusting harmonic restraint.
Explains the process for checking and adjusting restraint.
Guides the ratio matching adjustment process.
Describes a method for checking tap settings.
Explains how targets indicate relay operation.
Outlines precautions for disabling the relay.
Provides instructions for cleaning relay contacts.
Details periodic verification of the pickup setting.
Describes periodic checking of harmonic restraint.
Outlines periodic testing of through-current restraint.
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