ABB NTDI01 Digital I/O Termination Unit

REF615A ABB Relion 615 Series Feeder Protection and Control Relay

REF615A ABB Relion 615 Series Feeder Protection and Control Relay

Availability: 10 left in stock

ABB REF615A Feeder Protection and Control Relay Configured for feeder line supervision in medium-voltage distribution networks, the ABB REF615A (REF615A...

SKU: REF615

Manufacturer: ABB
Product No.: REF615
Product Type: Protection Relays
Product Origin: Switzerland
Payment:T/T, Western Union
Weight: 4000g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

ABB REF615A Feeder Protection and Control Relay

Configured for feeder line supervision in medium-voltage distribution networks, the ABB REF615A (REF615A Relion 615 Series) provides direct physical signal processing and breaker control execution.

Suffix Breakdown & Model Matrix

Model	Description
REF615	Feeder Protection IED base architecture
A	Standard variant for feeder protection and control applications

Hardware Specifications

Parameter	Specification
Model	REF615A
Brand	ABB
Origin	Finland / EU
Weight	4.0 kg (Standard configuration)
Dimensions	177 mm x 222 mm x 202 mm
Operating Temp	-40 deg C to +55 deg C
Power Consumption	24–48 VDC or 110–240 VAC/VDC
Communication	IEC 61850, Modbus TCP/RTU, DNP3
Protection Class	IP54 (Front), IP20 (Rear)
Mounting	Withdrawable plug-in design

PLC Deterministic Networks and Firmware

The REF615A integrates high-speed digital signal processing to facilitate deterministic GOOSE messaging over IEC 61850-8-1 networks. The internal firmware supports robust backplane bus communication velocity, allowing for sub-cycle logic execution required for protection interlocking and auto-reclosing sequences. The I/O density scaling is achieved via modular binary input and output configurations, ensuring that control logic latency remains within defined limits for utility-grade feeder management. Firmware flash compatibility allows for field-level updates to communication protocol stacks and protection algorithms without requiring physical chassis replacement, ensuring long-term interoperability with modern substation automation platforms.

Frequently Asked Questions (FAQ)

Q: Can the unit be withdrawn from the chassis while the feeder is energized?

A: The REF615A features a withdrawable design, but primary current and voltage circuits must be properly isolated or shorted via test blocks before physical withdrawal to prevent unintended secondary-side arcing or open-CT conditions.

Q: Is the unit compatible with existing legacy communication protocols?

A: Yes, the IED supports legacy connectivity including SPA and LON protocols, alongside modern Ethernet-based standards like IEC 61850 and Modbus TCP, enabling backward compatibility in retrofitted substations.

Field Installation Guidelines

Mounting: Ensure the rack-mount housing is securely installed in the switchgear panel. Verify that the unit is seated correctly in the cradle to ensure proper engagement of the rear terminal contacts.
Grounding: Connect the rear earthing screw to the substation ground busbar using a minimum 4 mm squared copper conductor. This is necessary to maintain the integrity of the electromagnetic compatibility (EMC) shielding.
Wiring: Use screened twisted-pair cables for communication interfaces. Terminate cable screens at the dedicated earthing point on the terminal block to reduce common-mode noise and prevent protocol conversion latencies.
Commissioning: Prior to setting the device in service, verify the status of binary inputs and ensure that the mimic diagrams on the graphical HMI correspond correctly to the physical position of the primary switchgear equipment.

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