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ABB REF601_and_REJ601 Feeder protection and control relay
ABB REF601_and_REJ601 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). The relays are available in three alternative application configurations.
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.
The REF601 and REJ601 also offer thermal overload protection for feeders, cables and transformers. Other protections include negative phase sequence protection, phase discontinuity protection and circuit breaker failure protection. The relays also have an auto-recloser option for overhead line feeders.
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 switchgear.
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.
Measurement
All versions of the relay continuously measure phase currents and ground current. Ground current can be measured using an external zero sequence current transformer or can be calculated internally.
Instructions and warnings related to the operation of the product:
The following specifications must be strictly observed:
The technical specifications and typical applications of the product system must be strictly observed.
PERSONNEL TRAINING: Only trained personnel may install, operate, maintain or repair the product system. These personnel must be instructed on the
These personnel must be instructed and briefed on the conditions in the hazardous area.
Unauthorised modifications: No modifications or structural changes may be made to the product system.
Maintenance Responsibility: It must be ensured that the product system is used only under appropriate conditions and in a condition fully suitable for use.
Working environment: The user must fulfil the specified environmental conditions:
Safety regulations
The following safety regulations must be fully observed when (maintenance) work is carried out on the product system:
1 Disconnect completely.
2 Secure to prevent reconnection.
3 Confirm that the installation has been completed.
4 Perform grounding and short-circuiting.
Maintenance and troubleshooting
Periodic checks:
Periodically check the status of the LEDs on the board to ensure that all signals are operating correctly.
Check that jumpers are configured correctly to ensure proper operation of the board.
Cleaning & Maintenance:
Keep the surface of the circuit board clean and dry to avoid dust and moisture damage to the board.
Regularly check the connection of power and signal cables to ensure that the connection is firm and reliable.
Troubleshooting:
If a fault occurs, you can troubleshoot the problem by checking the LED indicators, jumper configurations, power and signal cables.
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