New ABB certification cuts customer costs ABB motors has achieved stator and rotor component certification for its high voltage modular and cast iron induction motors up to 7,000 kW and rotor component certification for its low voltage cast iron motors.
The certification proves that its non-sparking (Ex nA) and increased safety (Ex e) motors meet the latest and toughest IEC and EN standards according to IEC 60079-15:2005 and EN 60079-15:2005 for Ex nA and IEC 60079-7:2006 and EN 60079-7:2007 for Ex e. Compared to uncertified motors, the ABB approach of achieving certification for its motors ensures customers get reduced initial capital expenditure, lower operating costs and faster starting. This is because uncertified motors need special measures such as pre-start ventilation (purging), which requires a higher capacity air compressor, piping and a ventilation control unit, increasing capital expenditure. Uncertified motors also require purging every time the motor is started, increasing the time taken to get plant up and running. Reliability is also improved as no additional components are required. Most importantly, ABB's certified motors offer proven safety, as testing represents the only way to verify that equipment is really safe.The latest IEC and EN standards specify criteria for risk assessment and gas environment tests for rotor and stator designs to show that the motors are spark-free in all operational conditions. The standards specify that a series of three tests should be carried out in an explosive gas environment. The stator tests consist of a sinusoidal voltage test, to check for sparking during normal operation and an impulse test, which checks the stator discharges in case of voltage transients. The rotor test, which is preceded by a process to simulate ageing, checks for sparking on starting or stalling. The ABB motors achieved the following standards in the tests: All rotor tests passed (motors up to 15 kV) with Group IIA, IIB and IIC gases.
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