Electrical power distribution monitoring system and method

An electrical power distribution monitoring system, for a power distribution line having a plurality of sections and having a power input at an input end, there being a plurality of electrical loads connected to the power distribution line, said monitoring system comprising:

• (a) measurement means for measuring an electrical value at at least one of (i) a point on said power distribution line, (ii) a selected one of said electrical loads, and (iii) a selected group of said electrical loads,
• (b) a data store containing data relating to past power consumption by electrical loads connected to said power distribution line, and
• (c) calculating means connected to said measurement means and to said data store and arranged to calculate estimated electrical values in at least one of said sections of said power distribution line from both of at least one currently measured electrical value obtained by said measurement means and said data in said data store;
• wherein said measurement means comprises at least a first measurement device for measuring said at least one currently measured electrical value in a portion of said power distribution line closer to said input end thereof than all of said electrical loads.

An electrical power distribution monitoring system, for a power distribution network having at least one bus connected to a higher level power network through a transformer and at least one bank comprising a plurality of distribution lines each composed of a plurality of sections and connected to one of said at least one bus;

• said monitoring system comprising:
• for each said distribution line, a first sensor device for measuring the electricity transmission amount at an input end of the distribution line from one of said at least one bus;
• for each said distribution line, at least one second sensor device for measuring the electricity amount passing between the distribution line and at least one specific electrical load connected thereto;
• administrative information calculating means for calculating load distribution coefficients of each said section of each said distribution line from data of past power consumption of each said section;
• section predicting means for calculating a predicted electrical value of each said section of each said distribution line from outputs of said first and second sensor devices and said load distribution coefficients;
• and
• network supervising means for calculating deviations of said predicted electrical valves from a predetermined value or values.

A method of monitoring an electrical power distribution network which has a power distribution line having a plurality of sections and a power input at an input end, there being a plurality of electrical loads connected to said power distribution line, said method comprising the steps of:

• (a) measuring power being supplied to said input end of said power distribution line;
• (b) measuring power passing between said power distribution line and at least one specific one of said electrical loads;
• and
• (c) calculating, from measurements of said step (a) and step (b) and from data set in advance relating to power consumption by electrical loads connected to said power distribution line, estimated electrical power data of at least one of said sections of said power distribution line.

An electrical power distribution monitoring system, for a power distribution network having at least one bus connected to a higher level power network through a transformer and at least one bank comprising a plurality of distribution lines each composed of a plurality of sections and connected to said at least one bus, the system comprising:

• means for obtaining electricity amounts of said sections;
• means for calculating an electricity amount with respect to at least one said distribution line on the basis of the obtained electricity amounts;
• means for calculating an electricity amount with respect to said bank;
• means for comparing said electricity amounts calculated with respect to said at least one distribution line and said bank with preset reference electricity amounts for a distribution line and a bank;
• and
• means for supervising a state in which the electricity amounts calculated with respect to said at least one distribution line and said bank deviate from the reference electricity amounts.