Dead Line Detection - ABB RELION 670 SERIES Applications Manual

Line distance protection

Hide thumbs Also See for RELION 670 SERIES:

Table of Contents

Secondary system supervision

Delta V and delta I

Set the operation mode selector OpDVDI to Enabled if the delta function shall be in

The setting of DVPU should be set high (approximately 60% of VBase) and the current

threshold DIPU low (approximately 10% of IBase) to avoid unwanted operation due to

normal switching conditions in the network. The delta current and delta voltage function

shall always be used together with either the negative or zero sequence algorithm. If

is the primary voltage for operation of dU/dt and ISet

operation of dI/dt, the setting of DVPU and DIPU will be given according to equation

and equation 532.

EQUATION1765-ANSI V2 EN

ANSIEQUATION2385 V2 EN

The voltage thresholds VPPU is used to identify low voltage condition in the system. Set

VPPU below the minimum operating voltage that might occur during emergency

conditions. A setting of approximately 70% of VBase is recommended.

The current threshold 50P shall be set lower than the IMinOp for the distance protection

function. A 5...10% lower value is recommended.

Dead line detection

The condition for operation of the dead line detection is set by the parameters IDLDPU for

the current threshold and UDLD< for the voltage threshold.

Set the IDLDPU with a sufficient margin below the minimum expected load current. A

safety margin of at least 15-20% is recommended. The operate value must however

exceed the maximum charging current of an overhead line, when only one phase is

disconnected (mutual coupling to the other phases).

Set the VDLDPU with a sufficient margin below the minimum expected operating

voltage. A safety margin of at least 15% is recommended.

Fuse failure supervision VDSPVC (60)

1MRK 506 369-UUS -

the primary current for

(Equation 531)

(Equation 532)

Line distance protection REL670 2.2 ANSI

Application manual