EP 0820600 A1 19980128 - DISTANCE MEASUREMENT PROCESS
Title (en)
DISTANCE MEASUREMENT PROCESS
Title (de)
VERFAHREN ZUM DURCHFÜHREN EINER DISTANZMESSUNG
Title (fr)
PROCEDE DE MESURE DE DISTANCES
Publication
Application
Priority
- DE 9600628 W 19960403
- DE 19514698 A 19950413
Abstract (en)
[origin: WO9632652A1] A distance protection measurement process is disclosed for multiple-phase electric energy transmission lines. Voltage and current in the faulty phase conductor are sensed, digitised and evaluated in linear phase response, non-recursive digital filters (FIR filters) of a filter unit. The weighting factors of the FIR filters are freely predetermined and errors are corrected by means of a correction factor. The distance between the faulty area and impedance measurement values that indicate the measurement site are derived in a computer from the output values of the filter unit. In order to measure distances with accuracy even in the case of monopolar short-circuits to ground, a total current (IOFA) that corresponds to the sum of the currents in the phase conductors of the energy transmission line is sensed, digitised and evaluated in additional FIR filters (8, 9) of the filter unit (1), forming output values (mk, nk). The computer (10) calculates four auxiliary values with which it calculates, together with the output values (yk, mk, nk, wk, vk) of the filter unit (1), a length factor (m) and a resistance (Rf) that is proportional to the resistance of the faulty area. By multiplying the length factor (m) by the kilometric resistance (R'1) of the associated system and by adding the resistance value (Rf) and multiplying the kilometric reactance (L'1) of the associated system by the length factor (m), the measurement impedance (R, X) that characterises the distance from the faulty area is calculated.
IPC 1-7
IPC 8 full level
G01R 31/08 (2006.01)
CPC (source: EP)
G01R 31/088 (2013.01); G01R 31/085 (2013.01)
Citation (search report)
See references of WO 9632652A1
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
WO 9632652 A1 19961017; DE 19514698 C1 19961212; EP 0820600 A1 19980128
DOCDB simple family (application)
DE 9600628 W 19960403; DE 19514698 A 19950413; EP 96909030 A 19960403