Sunday, May 19, 2013

Advanced Motor Protection

As a result of integrating a microprocessor or an application specific integrated circuit (ASIC) as the brains of a solid-state overload relay, the opportunity to add advanced protective functionality to the overload relay
becomes very practical.
Advanced Overload Protection Devices: 
Besides “basic” overload protection, advanced solid-state overload relay devices can offer additional functionality that previously would have required several additional protection devices to be used in the motor circuit.
By consolidating many protective features into a single device, installation costs, component costs, panel size, and maintenance time can be significantly reduced while performance and efficiency of the system can be increased. An additional benefit of solid-state devices is its ability to function via network communications. Through a communication network, vital motor information can be collected, processed and displayed in order to take corrective action prior to reaching fault conditions. Examples of data that
can be obtained through the solid-state overload relay include:
• % Thermal capacity used (0–100%)
How close is the motor to a trip condition (100%)?
• Phase unbalance
• Average current
• FLA settings
• Fault frequency
• Fault cause indication
Through triac outputs, control via a communication network can occur. Control functions include:
• Start/Stop
• Reset
• Restart limit
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