ABB REM620A Motor protection and control device

Description

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ABB REM620A Motor protection and control device.REM620 is a dedicated motor management relay for the protection, control, measurement and supervision of medium- and large-sized asynchronous and synchronous motors in the manufacturing and process industry.

ABB’s remote I/O concept introduces a new way of extending the I/O capabilities of protection relays. The concept is aimed at increasing the hardware functionality of the protection relays, while still maintaining the relay’s compact design. This way remote I/O can be used, when it is needed. The information between the remote I/O units and the main protection relay is exchanged over the latest communication standard IEC 61850. This enables easy integration into the systems and is in line with the latest standards.

ABB’S POWER PROTECTION PHILOSOPHY：

Having delivered protection relays to more than 100 countries, ABB fully understands the need for diverse protection philosophies that meet local legislation, safety requirements and engineering practice. Therefore, ABB has developed a power protection philosophy that not only serves the specific needs and requirements of diverse power systems, but also creates confidence and peace of mind for both the power system owners and users.

The main purpose of a protection relay system is to recognize any abnormal power system condition(s), or abnormally operating system component(s). Based on the information gathered, the protection system will initiate corrective actions that return the system to its normal operating state. This provides a safe environment for all.

Protection relays are activated when something abnormal has happened in the power system; they do not prevent network faults from arising. Selecting the right protection functions and methods improves the performance and the reliability of the protection system, thus minimizing the effects of network faults and preventing the disturbance from spreading to the healthy parts of the network（www.seeiyo.com  ）.

Advantages of a complete protection systemClose attention must be paid to operating speed,sensitivity, selectivity and reliability of theprotection system. There is a strong correlationbetween the operating speed of the protectionsystem and the damage and danger caused by anetwork fault. Substation automation providesremote control and monitoring capabilities,which speed up the location of faults and therestoration of the power supply. Fast operation ofthe protection relays also minimizes post-faultload peaks. Together with voltage dips, post-faultload peaks increase the risk of the disturbancespreading to healthy parts of the network. Thesensitivity of the protection must be adequate todetect relatively high resistance earth faults andshort-circuits in the most distant parts of thenetwork. Reliable selectivity is essential to limitthe loss of power supply to as small a part of thenetwork as possible, and to allow the faulted partof the network to be reliably located. Correctiveactions can then be directed to the faulty part ofthe network, so that the power supply can berestored as quickly as possible.

The protection system must have a high degreeof reliability. This also means that if, for example,the circuit breaker (CB) fails to operate, theback-up protection will clear the fault. Substationautomation (SA) puts the operator in completecontrol of the substation. In addition, SAimproves the power quality of the transmissionand distribution network under normal operation,but especially in a disturbance situation andduring substation maintenance activities. An SAor SCADA brings the full benefits of digitaltechnology into protection and control of thenetworks. The protection relays are easily set-upand parameterized through easy and safe accessfrom the operator’s workplace.