Product Description

The ABB REK510 is a current injection device designed for rotor earth-fault protection of synchronous machines. It is used with the excitation circuit of generators and other synchronous machines to help detect insulation faults between the rotor field winding and earth. The REK510 applies a 100 VAC secondary voltage to the rotor circuit through coupling capacitors, producing a small measurement current that can be monitored by the associated earth-fault protection function. ABB identifies REK510 as an injection device rather than a general-purpose controller unit.

Product Parameters

Item	Specification
Brand	ABB
Model	REK510 / REK 510
Product Type	Current Injection Device
Application	Rotor Earth-Fault Protection
Protected Equipment	Synchronous Machine / Generator Rotor
System	Excitation Circuit
Injection Voltage	100 VAC secondary voltage
Auxiliary Supply	58, 100 or 230 VAC, 50/60 Hz
Injection Method	Coupling Capacitors
Installation	Surface-Mounted Metal Enclosure
Dimensions	Approx. 140 × 266 × 257 mm
Weight	Approx. 5.4 kg
Protection Function	Rotor Field-to-Earth Fault Detection
Status	Legacy / Existing-System Protection Component
Condition	Verify actual stock condition before installation

FAQ

Q: What is the ABB REK510?

A: REK510 is a current injection device used for earth-fault protection of the rotor excitation circuit in synchronous machines.

Q: Is REK510 a controller unit?

A: ABB documentation identifies it specifically as a current injection device, not a general-purpose controller. It works together with the associated rotor earth-fault protection function.

Q: What voltage does REK510 inject into the rotor circuit?

A: The device establishes a 100 VAC secondary voltage through coupling capacitors toward the rotor circuit and earth.

Q: What auxiliary supply can the REK510 use?

A: ABB documentation specifies secured 58 VAC, 100 VAC, or 230 VAC supplies at 50/60 Hz, depending on the configured application.

Q: What should be checked before replacement?

A: Verify the complete REK510 variant, auxiliary supply voltage, connection arrangement, coupling capacitors, associated protection relay, and original generator excitation-system configuration before installation.

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