Technical Data; Unsymmetrical Current Detection - ABB REC650 ANSI Technical Manual

Relion 650 series bay control

Hide thumbs Also See for REC650 ANSI:

Table of Contents

1MRK 511 287-UUS A

Technical manual

Unsymmetrical current indicated if:

any phase current is lower than CurrUnsymPU of the highest current in the three

the highest phase current is greater than CurrRelPU of IBase.

If these conditions are true, an unsymmetrical condition is detected. This detection is

enabled to generate a trip after a set time delay tTrip if the detection occurs in the next 200

ms after the circuit breaker has received a command to open trip or close and if the

unbalance persists. The 200 ms limitation is for avoiding unwanted operation during

unsymmetrical load conditions.

The pole discrepancy protection is informed that a trip or close command has been given

to the circuit breaker through the inputs CLOSECMD (for closing command information)

and OPENCMD (for opening command information). These inputs can be connected to

terminal binary inputs if the information are generated from the field (that is from

auxiliary contacts of the close and open push buttons) or may be software connected to the

outputs of other integrated functions (that is close command from a control function or a

general trip from integrated protections).

Technical data

CCRPLD (52PD) technical data

Operate value, current

asymmetry level

Broken conductor check BRCPTOC (46)

Identification

Function description

Broken conductor check

Range or value

(0.000-60.000) s

identification

Current protection

± 0.5% ± 25 ms

ANSI/IEEE C37.2

device number

Table of Contents