ABB ret650 Commissioning Manual

Also see for ret650: Applications manual Commissioning manual Commissioning manual Product guide Applications manual

Contents

• Trip circuit supervision• Protection DC supply supervision• DC system earth fault supervision• Busbar protection CT-circuit supervisionProtection IEDs shall be encapsulated according to environment requirements. Intropical climates, cubicles are provided with glass-door and ventilation louvres.Heaters for anti-condensation, often thermostatically controlled, are provided.Cubicle power-loss is limited not to exceed protection IED temperature limits,which is 55°C according to the IEC standard.7.1.2 Commissioning testsDuring commissioning all protection functions shall be verified with the settingvalues used at each plant. The commissioning tests must include verification of allcircuits by green-lining the circuit diagrams and the configuration diagrams for theused functions.Further, the settings for protection functions are tested and recorded carefully asoutlined for the future periodic maintenance tests.The final testing includes primary verification of all directional functions whereload currents is checked on the local HMI and in PCM600. The amplitudes andangles of all currents and voltages should be checked and the symmetry verified.Directional functions have information about the measured direction and, forexample, measured impedance. These values must be checked and verified ascorrect with the export or import of power available.Finally, final trip tests must be performed. This involves activation of protectionfunctions or tripping outputs with the circuit breaker closed and the tripping of thebreaker verified. When several breakers are involved, each breaker must bechecked individually and it must be verified that the other involved breakers arenot tripped at the same time.7.1.3 Periodic maintenance testsThe periodicity of all tests depends on several factors, for example the importanceof the installation, environment conditions, simple or complex equipment, static orelectromechanical IEDs, and so on.The normal maintenance praxis of the user should be followed. However ABBproposal is to test:Every second to third yearSection 7 1MRK 504 126-UEN -Commissioning and maintenance of the fault clearing system80Commissioning Manual