ABB REU615E_D VOLTAGE PROTECTION AND CONTROL RELAY

Description

1.The voltage protection and control IED, REU615 is available in two standard configurations, denoted A and B. Configuration A is preadapted for voltage and frequency-based protection schemes in utility and industrial power systems and distribution systems including networks with distributed power generation. The B configuration is designed for automatic voltage regulation of power transformers equipped with an on-load tap changer. Both configurations also feature additional CB control, measuring and supervising functions. REU615 is a member of ABB’s Relion® product family and part of its 615 protection and control product series. The 615 series IEDs are characterized by their compactness and withdrawable–unit design.

Re-engineered from the ground up, the 615 series has been designed to unleash the full potential of the IEC 61850 standard for communication and interoperability between substation automation devices. Once the standard configuration IED has been given the application-specific settings, it can directly be put into service.

The 615 series IEDs support a range of communication protocols including IEC 61850 with GOOSE messaging, IEC 60870-5-103, Modbus® and DNP3.

2. Standard configurations REU615 is available in two standard configurations. The standard signal configuration can be altered by means of the graphical signal matrix or the graphical application functionality of the Protection and Control IED Manager PCM600. Further, the application configuration functionality of PCM600 supports the creation of multi-layer logic functions using various logical elements, including timers and flip-flops. By combining protection functions with logic function blocks, the IED configuration can be adapted to user specific application requirements.

3. Protection functions

Standard configuration A is intended for busbar voltage supervision, load shedding (disconnection) and restoration (reconnection) applications. It is also used for overfrequency and underfrequency protection of power generators and for other AC equipment, e.g. capacitor banks, requiring three-phase overvoltage protection, three-phase undervoltage protection, residual overvoltage protection, positive phase sequence undervoltage protection, negative phase sequence overvoltage protection and frequency supervision.

The integrated load shedding and restoration functionality offers five instances for disconnection and reconnection of less-important loads in network overload situations. The five instances enable the connected feeders to be more thoroughly prioritized and grouped thus facilitating the securing of critical applications.

If the restoration process is coordinated by an automation system or process control system, the IED’s load shedding and restoration function can send a signal to the system when the prerequisites for network restoration are fulfilled.

Enhanced with optional hardware and software, standard configuration A also features three light detection channels for arc fault detection in the metering cubicle or busbar compartment of metal enclosed switchgear. The arc-fault detection sensor interface is available on the optional communication module.

When an arc arises the detection signal is sent to the protection IED(s) of the incoming feeder(s) as a binary signal using either hardwired signalling or horizontal GOOSE messaging. By simultaneous utilization of the overcurrent condition of the incoming feeder protection IED and the received arc detection signal, the circuit breakers of the incoming feeders can selectively be tripped thus isolating the fault.

The arc detection/protection schemes of the IEDs increase personnel safety and limit material damage within the switchgear in an arc fault situation.

Standard configuration B Standard configuration B is intended for automatic voltage regulation of power transformers equipped with an on-load tap changer. It also features three-stage three-phase non-directional overcurrent protection, three phase undervoltage and overvoltage protection. The IED also incorporates a thermal overload protection function, which supervises the thermal stress of the transformer windings to prevent premature aging of the winding's insulation.

The use of the multi-purpose protection function requires that the optional RTD/mA input module has been chosen when ordering. The multi purpose protection function enables protection based on analog values from the IEDs RTD/mA input module, or from other IEDs using analog horizontal GOOSE messaging. The protection function includes three instances, and the used analog values may, for example, consist of temperature, current, voltage or pressure values. By using the analog values, the set limit values.

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