REC670  Bay control REC670 1MRK511313-BEN C

REC670 is used for the control, protection and monitoring of different types of bays in power networks. The IED is especially
suitable for applications in control systems where the IEC 61850–8–1 Ed 1 or Ed 2 station bus features of the REC670
can be fully utilized. It is used for station-wide interlocking via GOOSE messages and vertical client-server MMS
communication to a local station or remote SCADA operator workplace. This supports the architecture with distributed
control IEDs in all bays with high demands on reliability. Redundant communication is obtained through the built-in PRP
feature which can be used in star or ringbus architectures. REC670 can be used on all voltage levels. It is suitable for the
control of all apparatuses in any type of switchgear arrangement.
The control is performed from remote (SCADA/Station) through the IEC 61850–8–1 Ed1 or Ed2 station communication or from
the built-in multi-display local HMI. Cyber security measures are implemented to secure safe autonomous operation of the
protection and control functions even if simultaneous cyber attacks occur. For all common types of switchgear
arrangements, there are different pre-configurations for control and interlocking. One REC670 control IED can be used for
single bay or multi-bay applications. The control operation is based on the select-before-execute principle to give highest
possible security. There are synchrocheck functions available to assist optimal breaker closing at the right instance in
synchronous as well as asynchronous networks.

REC670

A number of protection functions are available for flexibility in use for different station types and busbar arrangements. To
fulfil the user’s application requirements, the REC670 features, for example, up to six instantaneous phase and earth
overcurrent functions, 4–step directional or non-directional delayed-phase and earth overcurrent functions, thermal
overload and frequency functions, two instances of 2–step under- and overvoltage functions, autorecloser functions and
several different measuring functions. This, together with the multi-display local HMI that can show one or more pages per
feeder allows using the REC670 for protection and control for up to six bays in a substation.

The auto-reclose for single-, two-, and/or three-phase reclose
includes priority circuits for multi-breaker arrangements. It cooperates with the synchrocheck function with high-speed or
delayed reclosing. Several breaker failure functions are available to provide a breaker failure function independent from
the protection IEDs, also for a complete one- and a half breaker diameter.
Disturbance recording and fault locator are available to allow independent post-fault analysis after primary disturbances in
case of a failure in the protection system.