ABB REF601 Product Manual - Page 3

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ABB

Feeder Protection

REF601 IEC

Product Version: 1.0

1. Description

REF601 is a dedicated feeder protection relay,

intended for the protection, measurement and

supervision of utility substations and industrial

power systems.

Engineered from the ground up, the relay is in-

spired by and is compatible with the Rogowski

coil sensor for current measurement. The new

feeder protection relay is designed to unleash the

advantages of current sensors for protection and

control in medium voltage applications.

2. Protection Functions

REF601 offers three-stage overcurrent and two-

stage earth-fault protection functions. Transform-

er inrush detector function is also incorporated

to prevent unwarranted trippings.

Protection

Three-phase non-directional overcurrent, low-set stage

Three-phase non-directional overcurrent, high-set stage

Three-phase non-directional overcurrent, very high-set stage

Non-directional earth-fault, low-set stage

Non-directional earth-fault, high-set stage

Three phase transformer inrush detector

REF601

Fig. 1 Protection function overview of feeder

protection REF601 with earth current

measurement by internal calculation

The low-set stages for overcurrent and earth-

fault protection are equipped with selectable

Definite-time (DT) and Inverse-Definite Minimum

Time (IDMT) characteristics. The relay features

standard IDMT characteristics – Normal Inverse

(NI), Very Inverse (VI), Extremely Inverse (EI) &

Long-time Inverse (LI) and a special characteristic

RI inverse (RI) for better co-ordination with rest

of the network.

The table below indicates the protection functions

available in the relay.

P-1

P-2

Fig. 2 Protection function overview of feeder

protection REF601 with earth current

measurement by external CBCT

1MDB07207-YN C

Issued: January 2009

Revision: C /19 Jan. 2009

IEC

ANSI

Code

3I >

3I >>

50 / 51

3I >>>

Io >

51N

Io >>

50N/51N

P-1

P-2

REF601