ABB REF620 ANSI Feeder protection and control

ABB REF620 ANSI Feeder protection and control

DESCRIPTION

The REF620 is a dedicated feeder IED perfectly aligned for the protection, control, measurement and supervision of utility substations and industrial power systems. REF620 is a member of ABB’s Relion® family and a part of its 620 protection and control product series. The 620 series IEDs are characterized by flexibility and performance for demanding utility distribution and industrial applications. Engineered from the ground up, the 620 series has been designed to unleash the full potential of the IEC 61850 standard for communication and interoperability of substation automation devices.

Unique REF620 ANSI features

− Six setting groups 

− Drawout design 

− Underground, overhead cable fault detection (CFD) 

− High-speed (< 1 ms) outputs 

− High impedance (HIZ) fault detection 

− Arc flash detection (AFD) 

− Phase step distance protection 

− Power quality 

− Ring-lug terminals for all inputs and outputs 

− Large, easy to read LCD screen 

− Programmable push-buttons 

− Environmentally friendly design with RoHS Compliance

Standard configurations

The REF620 relay main application is feeder protection and control and offers three standard configurations whose relay functions and features are based on the needs of the application. See Tables 1 and 2 for details. Configuration A comprises protection scheme useful in enhanced utility and industrial feeder protection with single breaker . Configuration B includes functions and features for comprehensive feeder protection and control applications in with one-and-half breaker configuration . Configuration C includes functions and features for comprehensive feeder protection and control applications in with 2 breaker configuration.

Protection functions

Th is IED provides non-directional phase and ground overcurrent, phase step distance, thermal overload, phase unbalance and phase discontinuity protection with sensitive earth fault (SEF), high impedance fault detection (HIZ), directional phase, ground and neutral overcurrent and phase, ground (residual), positive sequence and negative sequence undervoltage and overvoltage protection. Also, the IED offers three-pole multishot autoreclose function for utility overhead distribution feeders. Enhanced with an arc fl ash detection (AFD), the relay also features three light detection channels for arc fault detection of the circuit breaker, busbar and cable compartment of metal-enclosed switchgear. The AFD sensor interface is available on the optional communication module. Fast tripping increases personal safety and limits material damage within the switchgear in an arc fault situation.

Control

The relay offers status and control of one or two breakers, depending on the standard configuration selected, with a set of push-buttons on the front panel local human machine interface (LHMI) for opening and closing a breaker. Flexible remote breaker control of select-before-trip (SBO) or direct trip is also available with each of the supported DNP3.0 Level 2+, Modbus and IEC 61850 communication protocols. Interlocking schemes required by the application can be configured with the application configuration tool in PCM600.

Inputs and outputs

The availability of analog and binary inputs depends upon the standard configuration ordered. Standard and optional binary inputs and outputs (I/O) also depend upon the selected IED configuration. Table xx (see comment 16) details the analog and binary inputs available for each standard configuration. The phase-current inputs are user programmable for 5 A or 1 A ct secondary nominal rating. The ground ct option is programmable for 5/1 A nominal rating, the SEF/HIZ ct option has a fixed 0.2 A nominal rating. The sensitive earth fault ct option provides SEF protection and includes a separate, independent HIZ protective function for detecting downed conductors. The phase-current and ground current nominal rating of 5 A or 1 A are selected in the relay software. The nominal secondary voltage of the three-phase and ground VT inputs are user programmable. The binary input turn-on thresholds are programmable from 18…176 V DC by adjusting the relay’s parameter settings.