56
Distance protection (ZM)
Chapter 4
Line distance
1
Distance protection (ZM)
1.1
Application
The ZM distance protection function provides fast and reliable protection for overhead lines and
power cables in all kinds of power networks. For each independent distance protection zone, full
scheme design provides continuous measurement of impedance separately in three independent
phase-to-phase measuring loops as well as in three independent phase-to-earth measuring loops.
Phase-to-phase distance protection is suitable as a basic protection function against two- and
three-phase faults in all kinds of networks, regardless of the treatment of the neutral point. Inde-
pendent setting of the reach in the reactive and the resistive direction for each zone separately,
makes it possible to create fast and selective short circuit protection in power systems.
Phase-to-earth distance protection serves as basic earth fault protection in networks with directly
or low impedance earthed networks. Together with the independent phase preference logic, it
also serves as selective protection function at cross-country faults in isolated or resonantly
earthed networks.
Independent reactive reach setting for phase-to-phase and for phase-to-earth measurement se-
cures high selectivity in networks with different protective relays used for short-circuit and
earth-fault protection.
Содержание REL 501-C1 2.5
Страница 1: ...Technical reference manual Line distance protection terminal REL 501 C1 2 5 ...
Страница 2: ......
Страница 26: ...14 Introduction to the technical reference manual Chapter 1 Introduction ...
Страница 42: ...30 Technical data Chapter 2 General ...
Страница 66: ...54 Blocking of signals during test BST Chapter 3 Common functions ...
Страница 142: ...130 Time delayed overvoltage protection TOV Chapter 6 Voltage ...
Страница 162: ...150 Autorecloser AR Chapter 9 Control ...
Страница 163: ...151 About this chapter Chapter 10 Logic Chapter 10 Logic About this chapter This chapter describes the logic functions ...
Страница 174: ...162 Event function EV Chapter 10 Logic ...
Страница 210: ...198 Serial communication Chapter 12 Data communication ...
Страница 226: ...214 Serial communication modules SCM Chapter 13 Hardware modules ...
Страница 227: ...215 Chapter 14 Diagrams Chapter 14 Diagrams This chapter contains the terminal diagrams for the terminal ...
Страница 229: ...217 Terminal diagrams Chapter 14 Diagrams 1 2 Terminal diagram REL 501 C1 Figure 86 REL 501 C1 ...
Страница 230: ...218 Terminal diagrams Chapter 14 Diagrams Figure 87 REL 501 C1 with DC switch ...
Страница 234: ...222 Terminal diagrams Chapter 14 Diagrams ...
Страница 237: ......