ABB REJ527 Directional Earth-Fault Relay

ABB REJ527 Directional Earth-Fault Relay Supplier and Exporter in India

ABB REJ527 Legacy Relay – Price, Availability and Spare Enquiries

ABB REJ527 is a directional or non-directional earth-fault protection relay used for feeders, substations and industrial power-distribution systems. For price and availability, send the complete ABB order code, nameplate photo, quantity and destination country.

Description

ARP IMPEX supplies and exports ABB REJ527 directional earth-fault protection relays for existing medium-voltage switchgear, substations and industrial electrical installations.

REJ527 is used where the protection system needs to determine not only whether an earth fault has occurred, but also the direction of the fault. The relay measures earth-fault current, zero-sequence voltage and the phase angle between them. This makes it useful in distribution networks where simple non-directional earth-fault protection may not provide the required selectivity.

The relay can operate in either directional or non-directional mode. It has low-set and high-set earth-fault current stages along with zero-sequence voltage supervision. REJ527 also includes intermittent earth-fault protection, which can be useful in cable networks where faults may appear and disappear instead of remaining continuously present.

ABB used REJ527 mainly for earth-fault protection and supervision in distribution substations. Its documentation also covers generator, motor and transformer protection applications.

For ABB REJ527 price, legacy spare availability or replacement enquiries, send us the complete relay code from the marking strip or nameplate. REJ527 was supplied with different earth-fault current input ratings, so the exact order number is important when matching an old unit.

Technical Specifications

• Brand: ABB
• Model: REJ527
• Series: ABB REJ 52_ Series
• Product type: Directional / non-directional earth-fault protection relay
• Product status: Not active since 2009
• Main protection: Directional earth-fault protection
• Non-directional operation: Available
• Low-set earth-fault stage: I₀>
• High-set earth-fault stage: I₀>>
• Zero-sequence voltage stage: U₀b>
• Current-input versions: 0.2 A / 1 A or 1 A / 5 A
• Low-set timing: Definite-time or IDMT
• High-set timing: Definite-time
• Intermittent earth-fault protection: Available
• Circuit-breaker failure protection: Included
• Disturbance recording: Included
• Rated frequency: 50 / 60 Hz selectable
• Front communication: Optical PC interface
• Rear communication: RS-485
• Communication protocols: SPA bus and IEC 60870-5-103
• HMI: Alphanumeric LCD
• Self-supervision: Continuous monitoring of relay electronics and software

Features

• Directional earth-fault protection
• Non-directional earth-fault mode
• Low-set earth-fault protection stage
• High-set earth-fault protection stage
• Zero-sequence voltage supervision
• Definite-time operation
• IDMT operation on the low-set stage
• Intermittent earth-fault protection
• Circuit-breaker failure protection
• Disturbance recorder
• Two setting groups
• Configurable trip and signalling contacts
• Front optical communication
• Rear serial communication
• Local LCD indication
• Continuous internal self-supervision

The two earth-fault current stages can also be configured as voltage stages, allowing REJ527 to provide a three-stage voltage monitoring arrangement where required.

Applications

ABB REJ527 can be used for:

• Directional feeder earth-fault protection
• Medium-voltage feeder protection
• Cable feeder earth-fault protection
• Distribution substations
• Industrial power-distribution networks
• Isolated-neutral networks
• Compensated or resonant-earthed networks
• Earth-fault direction detection
• Intermittent earth-fault protection
• Busbar and feeder protection schemes
• Generator earth-fault protection
• Motor earth-fault protection
• Transformer earth-fault protection
• Existing ABB REJ protection panels
• Medium-voltage switchgear

REJ527 is particularly useful where the protection scheme needs directional discrimination between earth faults on different feeders rather than simple residual-current detection.

ABB REJ527 Order Codes

ABB supplied REJ527 with two main earth-fault current input versions.

ABB REJ527B 411BAA

• Order number: REJ527B 411BAA
• ABB Article Number: 1MRS091411-BAA
• Earth-fault current input: 0.2 A / 1 A

ABB REJ527B 418BAA

• Order number: REJ527B 418BAA
• ABB Article Number: 1MRS091418-BAA
• Earth-fault current input: 1 A / 5 A

This difference should be checked before ordering an exact replacement. A request stating only “ABB REJ527” may not be sufficient to identify the correct current-input version.

For a matching spare, send the complete order code exactly as shown on the relay.

ABB REJ 52_ Protection Relay Family

REJ527 is part of ABB’s older REJ 52_ numerical protection relay range.

The main models include:

• ABB REJ521 – Non-directional earth-fault protection relay
• ABB REJ523 – Three-phase overcurrent protection relay
• ABB REJ525 – Combined overcurrent and earth-fault protection relay
• ABB REJ527 – Directional or non-directional earth-fault protection relay

For simple identification:

• REJ521 – earth-fault protection
• REJ523 – overcurrent protection
• REJ525 – overcurrent + earth-fault protection
• REJ527 – directional earth-fault protection

ABB’s wider numerical relay range also included the earlier REJ511, REJ513, REJ515 and REJ517 models.

ABB REJ527 vs REJ521

REJ521 and REJ527 are both earth-fault protection relays, but they should not be treated as the same product.

REJ521 provides non-directional earth-fault protection.

REJ527 can determine the direction of an earth fault by using earth-fault current, zero-sequence voltage and phase-angle information. It can also be set for non-directional operation.

For an existing REJ527 installation, the directional protection requirement should therefore be considered when checking a replacement relay.

ABB REJ527 Legacy Spare and Replacement Enquiries

ABB REJ527 is a discontinued legacy relay. ARP IMPEX can assist with:

• ABB REJ527 price and availability
• REJ527 part-code checking
• REJ527B 411BAA enquiries
• REJ527B 418BAA enquiries
• 0.2/1 A and 1/5 A input version identification
• Legacy spare requirements
• Existing relay matching
• Replacement enquiries
• Single-unit requirements
• Multiple-quantity quotations
• ABB technical documentation
• Export packing
• International shipment

For an ABB REJ527 spare or replacement requirement, send:

• Complete ABB REJ527 order code
• Clear relay nameplate photograph
• Quantity required
• Destination country
• Required delivery date

Why Buy ABB REJ527 from ARP IMPEX?

ARP IMPEX supplies ABB protection relays for utilities, industrial plants, EPC contractors, panel builders, maintenance companies and electrical traders.

We can assist with ABB REJ527 part-number identification, legacy relay availability, matching of the existing unit and international export supply.

Request a Quote for ABB REJ527

Looking for an ABB REJ527 directional earth-fault relay supplier in India or trying to source an old relay for an existing switchgear panel?

Send us the complete ABB order code, nameplate photograph, quantity and destination country.

Send your ABB REJ527 part number to ARP IMPEX for availability, price and export quotation.