ABB REF601 CE446BB1NH Dedicated feeder protection and control relay

ABB REF601 CE446BB1NH Dedicated feeder protection and control relay

DESCRIPTION

The REF601 is a dedicated feeder protection and control relay. The REJ601 is an overcurrent protection relay without breaker control. These relays are intended for the protection of utility substations and industrial power systems within primary and secondary distribution networks. They are members of ABB’s Relion® product family and part of its 605 series.

These relays, provide an optimized composition of protection, monitoring and control functionality in one unit, with the best performance usability in its class and are based on ABB’s indepth knowledge of protection and numerical technology.

Relay functions

The REF601 and REJ601 can be pre-configured which facilitates easy and fast commissioning of switchgear. To emphasize the simplicity of using these relays, only application specific parameters need to be set within the relay’s intended area of application. The standard signal configuration can be altered by LHMI (local human-machine interface).

Protection functions 

The REF601 and REJ601 offer three-stage overcurrent and twostage ground-fault protection functions. The transformer inrush detector function is incorporated to prevent unwanted tripping due to energizing of transformers. The REF601 and REJ601 offer three-stage overcurrent and two-stage ground fault protection functions. The low-set stages for overcurrent and ground fault protection are equipped with selectable characteristics – Definite Time (DT) and Inverse Definite Minimum Time (IDMT). The relays feature standard IDMT characteristics according IEC 61255-3 - Normal Inverse, Very Inverse, Extremely Inverse, Long-time Inverse. They also feature characteristics according to ANSI C37.112 - Moderate Inverse, Normal Inverse, Very Inverse, and Extremely Inverse. The relays also have a special characteristic RI Inverse (RI) for better coordination with the rest of the network. Additionally the relays also support two setting groups.

Application

The REF601 and REJ601 are protection relays aimed at protection and control of incoming and outgoing feeders in MV distribution substations. They can be applied for short-circuit, overcurrent and ground-fault protection of overhead lines and cable feeders of distribution and sub-distribution networks. The inrush current stabilization function allows the relays to be used as the main protection for distribution transformers.

The relay with application configuration B offers non-directional overcurrent and ground-fault protection. The residual current for the ground-fault protection is derived from the phase currents. When applicable, core-balance current transformers can be used for measuring the residual current, especially when sensitive ground-fault protection is required.

The application configuration C adds thermal overload protection for feeders, cables and transformers, phase discontinuity protection and circuit breaker failure protection. The application configuration D provides the highest functionality with incorporation of negative phase sequence protection and a multi-shot auto-recloser function making the relay suitable for overhead line feeders.

Optimized for limited space

With their compact size and unique technical features, the REF601 and REJ601 are ideal for retrofits, compact switchgear and switchgear with limited space. These relays have a small mounting depth and do not have any loose mounting accessories. Uniquely, the REF601 and REJ601 use a press-fit mounting arrangement, suitable for quick and easy installation on switchgea

Control 

The REF601 features control of one circuit breaker with dedicated push-buttons and guidance on local HMI for opening and closing. It includes two dedicated outputs for breaker control. The breaker control is also possible through optional MODBUS RTU or IEC 60870-5-103 communication.

Recorded data

The relays store fault records of analog values for the last five trip events in non-volatile memory. The fault recording is triggered by the trip signal of a protection function. Each fault record includes the current values for three phases and ground current along with a time stamp. These records enable the user to analyze the five most recent power system events. The relays record the number of phase and ground fault trip events into dedicated trip counters. These trip counters cannot be reset by the user and are stored in non-volatile memory. The recorded information can be accessed locally via the user interface on the relay front panel and can be uploaded for subsequent fault analysis.

Self-supervision and test function

The relay’s built-in self-supervision system continuously monitors the state of the relay hardware and the operation of the relay software. Any fault or malfunction detected will signal an alert for the operator. A permanent relay fault will block the protection functions of the relay to prevent incorrect relay operation. The relays support a built-in test mode which enables the user to test the relay HMI and binary outputs.

Application warning

In the case that the relay is supplied with UPS step-wave or square-wave, an interposing transformer is needed to keep the supply voltage (peak voltage) below the upper limit of the relay. These are the recommended transformer characteristics: 

− Nominal power: 20 VA 

− Secondary voltage: in the range 30...150 V AC