Filtering; Distance Measuring Zones - ABB RED650 Technical Manual

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Impedance protection

Filtering

Practically all voltage, current and impedance quantities used within the ZMFPDIS

function are derived from fundamental frequency phasors filtered by a half cycle

The phasor filter is frequency adaptive in the sense that its coefficients are changed

based on the estimated power system frequency.

A half cycle filter will not be able to reject both even and odd harmonics. So, while

odd harmonics will be completely attenuated, accuracy will be affected by even

harmonics. Even harmonics will not cause the distance zones to overreach

however; instead there will be a slightly variable underreach, on average in the

same order as the magnitude ratio between the harmonic and fundamental

The different fault loops within the IED are of full scheme type, which means that

earth fault loop for phase-to-earth faults and phase-to-phase faults for forward and

reverse faults are executed in parallel.

presents an outline of the different measuring loops for the six distance

IEC05000458 V2 EN-US

The different measuring loops at phase-to-earth fault and phase-to-

Each distance protection zone performs like one independent distance protection

function with six measuring elements.

Transients from CVTs may have a significant impact on the transient overreach of

a distance protection. At the same time these transients can be very diverse in

nature from one type to the other; in fact, more diverse than can be distinguished

by the algorithm itself in the course of a few milliseconds. So, a setting (CVTtype)

is introduced in order to inform the algorithm about the type of CVT applied and

Line differential protection RED650 2.2 IEC

1MRK 505 394-UEN A

GUID-16B5060B-101C-402A-BF25-06E70FDD7836 v2

GUID-74B12BB1-FE0A-4DE4-BDBE-159A438D396B v4

IEC05000458-2-en.vsd

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Relion 650 series