| 摘要 |
For locating the distance of a fault on a power supply line from a substation in an electricity reticulation system, primarily conversion means, (PR) are used, adapted to provide DC signals whose magnitudes are proportional to the AC values of current and voltage related to the fault and computing (D) means adapted to compute a quotient of those DC signals. The computing means also is adapted to apply an earth fault compensation factor and a line angle correction factor to the DC quotient and to thus provide a measure of the distance to the fault. A sample-and-hold means (S-H) is included, adapted to relay a value of the quotient to provide a measure of distance to fault only after a predetermined time during which transient effects may subside to some extent. An analogue to digital convertor (A-D) relays the signal to a printer (P) to provide a record of fault history. This locator is thus adapted to solve the problem of excessive technical complexity of certain existing apparatuses and so provide a less costly device which can be installed in larger numbers in a reticulation system for more comprehensive monitoring. |
