ABB feeder protection and control REF601 and REJ601 ANSI

9. 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. 

10. 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. 

11. Trip-circuit monitoring The trip-circuit monitoring continuously monitors the availability and operability of the trip circuit. It provides open-circuit monitoring both when the circuit breaker is in its closed and in its open position. It also detects loss of circuit-breaker control voltage. 

12. Access control To protect from unauthorized access and to maintain the integrity of information, the relays are armed with a three level, role-based user authentication system with individual passwords for operator, engineer and administrator levels. 

There are two alternative password protection options. 

The default is a combination of different navigation keys. 

The alternative is an alpha-numeric password. 

The user can select the password option based on their requirement.

13. Local HMI The local HMI features an alpha-numeric LCD display, LED indicators and navigation keys. Measurements, recorded data, events and settings can be viewed on the display. The relays have six LED indicators on the LHMI which are preconfigured for normal/IRF condition, pickup, trip, phase fault trip, ground fault trip and trip circuit fault indications. Support for multiple languages is built-in to the REF601 and REJ601. 

14. Inputs and outputs All configurations are offered with conventional CTs and are equipped with four 1A or 5A analog current inputs. Three are for phase current and one for ground current measurement. The relays all have four standard binary inputs. The binary inputs can be configured for various functions like blocking, protection reset, breaker position, breaker control and trip circuit supervision. These signals can be mapped to binary outputs and LEDs for indications. Individual inputs can be configured either as “Inverted” or “Non Inverted”. The REF601 and REJ601 both have six output contacts. Of these, two are power outputs and four are signaling outputs. The output contacts can be configured for different functions like routing of protection start/trip signals, external trip/open, external close command, and trip circuit monitoring status, etc. One dedicated output contact is available for normal condition/ IRF status indication. All binary input and output contacts are preconfigured according to the default configuration. However, they can be easily reconfigured by using the LHMI menu. 

15. Communication The relays are available with an optional communication feature with Modbus RTU protocol or IEC 60870-5-103 on RS-485 bus with two wire connection. This allows the relays to connect to a control and monitoring system through serial communication for remote monitoring. The communication card may be added at any time. 

16. 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