AU603946B2

AU603946B2 - Supervising system for distribution lines

Info

Publication number: AU603946B2
Application number: AU31425/89A
Authority: AU
Inventors: Yoshitaka Ito; Hiromi Nagasaka; Akimichi Okimoto
Original assignee: NGK Insulators Ltd
Current assignee: NGK Insulators Ltd
Priority date: 1988-09-20
Filing date: 1989-03-17
Publication date: 1990-11-29
Anticipated expiration: 2009-03-17
Also published as: JPH0284014A; AU3142589A

Description

COMMONWEALTH OF AUSTRALIA PATENTS ACT 1952 NAME ADDRESS OF APPLICANT: NGK Insulators, Ltd.

2-56, Suda-Cho, Mizuho-Ku, Nagoya City Aichi Prefecture Japan .aL!C. I IE NAME(S) OF INVENTOR(S): Hiromi NAGASAKA Akimichi OKIMOTO Yoshitaka ITO ADDRESS FOR SERVICE: DAVIES COLLISON Patent Attorneys 1 Little Collins Street, Melbourne, 3000.

COMPLETE SPECIFICATION FOR THE INVENTION ENTITLED: Supervising system for distribution lines The following statement is a full description of this invention, including the best method of performing it known to me/us: r I The present invention relates to a supervising system for electrical power distribution lines.

It finds particular application in controlling the actuation of electric power distribution equipment when a problem has arisen in the distribution lines.

Various supervising systems for electric power distribution lines have been proposed hitherto with the object of early determination of a faulty section of the distribution lines, separation of the same and early recovery of power supply for the non-faulty areas. In known systems for remote supervision, when fault data is transmitted from a slave station, the data is recorded and indicated to a supervisor.

In general, the separation of a faulty area or section is carried out by means of an °o o automatic faulty section separating device provided at the high tension distribution oo lines.

0 So In the abovementioned automatic faulty section separating device, the e a 15 process is generally carried out in the following order; separation of sub-station, Sre-closing the circuit, re-interruption, further re-closing etc., by using timing inter-action of the automatic section separating devices. This leads to inconvenience caused.by-repeated discontinuat- n-of services-for-non-faulty areas 4,e' and requires a long time for the correction of a fault condition.

20 An object of the present invention is to provide a distribution line tc supervising system which has a relatively quick response and improved flexibility in order to mitigate at least one of the aforementioned problems of the conventional systems.

According to a first aspect of the present invention,-there is provided a supervising system for distribution lines comprising in combination; slave stations having actuation controlling means for controlling actuation of distribution devices provided for each section of the distribution lines of a distribution line network based on actuation instruction data, detecting means for detecting occurrence of trouble in the distribution lines, and communication means for transmitting detecting data and condition data detected by said detecting means in relation to the respective slave stations and receiving said actuation instruction data addressed to said slave stations, and 820,cldspe.009,31425Jpc,1 0c _~_in a master station having communication means for receiving detecting data and condition means for receiving detecting data and condition data of each of the slave stations, processing means for calculating an optimum actuation controlling instruction data for actuating various distribution devices bced on said data at a time when a problem has occurred in a distribution line, memory means for memorizing the above calculated actuation instruction data, judging means for judging the faulty section based on the most recently transmitted detection data concerning the slave stations, and transmitting means for transmitting the actuation instruction data for the faulty section of which data is read out by the judging means from said memory means, said memory means comprising two parts which a can be alternately read and refreshed such that one part can be refreshed by input j e coc of updated actuation instruction data while the other part is being read.

a C ~According to a second aspect of the present invention, there is provided a supervising system for distribution lines comprising in combination; S, 15 slave stations having actuation controlling means for controlling actuation of distribution devices provided for each section of the distribution!lines of a distribution line-rietwork based on-actuatinrf-instruction data; :detecting-means for detecting occurrence of trouble in the distribution lines,- and-communication means o a for transmitting detecting data and condition data detected by said detecting means oeQ S0 I 20 in relation to the respective slave stations and receiving said actuation instruction Odata addressed to said slave stations, and a master station having communication means for receiving detecting data and condition data of each of the slave stations transmitted therefrom at a certain predetermined time-interval," processing means for calculating an optimum actuation C r o 25 controlling instruction data for various distribution devices for each section when trouble occurs, two memory means for alternately memorizing the various actuation controlling instruction calculated by the processing means based on the various data transmitted at each predetermined time interval, judging means for judging the faulty section based on the most recently transmitted detecting data concerning a relevant slave station, and a transmitting means for transmitting to the slave station the controlling instruction data corresponding to the faulty section read out from one of the two memory means being not in refreshing condition.

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m a 4 a According to a third aspect of the present invention, there is provided a supervising system for distribution lines comprising in combination; slave stations having actuation controlling means for controlling actuation fo distribution devices provided for each section of the distribution lines of a distribution line network based on actuation instruction data, detecting means for detecting occurrence of trouble in the di ,tribution lines, and communication means for transmitting detecting data and condition data detected by said detecting means in relation to the respective slave stations and receiving said actuation instruction data addressed to said slave stations, and a master station having communication means for receiving detecting data and condition data of each of the slave stations transmitted therefrom at a certain 5, a predetermined time interval, processing means for calculating an optimum actuation controlling instruction data for various distribution devices for each section at occurrence of trouble, two memory means for alternately memorizing the various 0 15 actuation controlling instruction calculated by the processing means based on the various data transmitted at each predetermined time interval, judging -means for judging the faulty; section based on-the: most:recently transmitted detecting. data concerning a relevant slave -stationi--and a-transmitting means for transmitting to the ,VV te slave station controlling instruction data corresponding to the faulty section read a 20 out from one of the two memory means being not in refreshing condition, and Se afurther having a second processing means for calculating further actuation e 0 instruction data for use in relation to a further expected trouble condition when the judging means has judged an occurrence of trouble based on the actuation controlling data transmitted-by the transmitting means to the slave stations and for memorizing the further actuation instruction data by supplying it to the other one of the memory means being in refreshing condition.

Accordingly, in a first embodiment of the present invention, the detecting data and the condition data of the slave stations are transmitted to the master station from each of the slave stations. The processing means in the master station operates to calculate an optimum actuation instruction data for the various power distribution devices based on the various transmitted data at an occurrence of a Y ,N problem. The result of this operation is memorised in memory means. The f'z2: 3 a20eIspc.95 t1 judging means judges an occurrence of a problem based on the most recent detecting data concerning the slave stations and reads out an actuation instruction data from the memory means and transmits it to the respective slave stations.

In a second embodiment of this invention, detecting data and condition data of the slave stations are transmitted to the master station. The processing means in the master station operates to calculate an optimum actuation controlling instruction.

data based on the various data transmitted from the slave stations at a predetermined time interval when a problem has occurred. The processing means I sends the result of this operation alternately into two memory means for storage therein and when a problem, or a "trouble condition", is judged by the judging O means, the above memorised actuation controlling instruction data related to the

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0 oooo o faulty section is read out from one of the two memories which is not in refreshing a o condition and transmitted to the slave stations.

In a third embodiment of this invention, the slave stations transmit the detecting data and conditions data to the master station. The processing means in the master station operates to calculate an optimum actuation controlling instruction data for various power distribution equipment for each section when a problem has occurred based on the various data transmitted from the slave stations at a predetermined time interval. The judging means memorizes the result of the above operation alternately into two memories and when occurrence of trouble is judged by the judging means, the actuation instruction data corresponding to the faulty section is read out from one of the two memories being not in refreshing condition S and transmitted to the slave stations. At the same time a second processing means operates to calculate actuation instruction data for the sectional trouble expected thereafter based on the transmitted actuation instruction and memorizes it into the other one of the two memories which had been in refreshing condition.

The invention will now be explained, by way of example only, by referring to the accompanying drawings, in which; Fig. 1 is a simplified system diagram for one embodiment of the present invention, Fig. 2 is a block diagram of a master station, A 'Fig. 3 is a block diagram of a slave station, 6 Fig. 4 is a diagram for showing the construction of a data frame, and Fig. 5 is a diagram for showing an inter-nal construction of RAM provided.

in the master station, 0 00 00000 0 000, C C C 90082,cldspc.009,314Z5.sMc5 Fig. 1 shows a distribution line network 3 in loop arrangement under supervision of a master station 2 provided in a supervising station 1. This loop distribution line network 3 is supplied from a power 06 sub-station H. A plurality of automatic switches SS (SS1 to SS20 in the illustrated embodiment) a-e arranged for each section of the distribution line 4 in the loop distribution line network 3.

A communication line 5 is provided in parallel 10 to the loop distribution line network 3 and slave stations K are arranged in the communication line 5 for 0 0 oooo respective switches

SS.

.00000 The communication line 5 is connected through 0 0 a repeater 6 to the master station 2, which is in charge for the supervision of the slave stations K. For the communication line 5 an optical fiber communication 0 0 I 0 circuit can be used.

00 Construction of the master station 2 will be explained in detail by referring to Fig. 2.

20 The master station 2 comprises a communication device 2 being signal transmitting and receiving means, a central processing unit CPU 11 being first and second operating means and judging means, 2 random access memories RAM 8 and 9 for memorizing the controlling 26 instruction data, and a read only memory ROM previously recorded with an operation program required i *0 Jee 0 0 So00 0o 0 00 0 Co 0 0o o o 40 00 00 0 0 o 0o 00 0 o o00 0 0 0 0 0 for the operation of the CPU 11.

The communication device 7 has mutual conversion function between the optical communication signal and an electric signal and this device is connected to the 06 communication line 5 between the master station 2 and the slave stations K.

CPU 11 carries out an operation for deriving an optimum controlling instruction data for the slave stations K based on the most recently detected data and conditional data related to each of the slave stations K received through the communication device 7 at each of predetermined time interval, and the previously memorized operational program stored in the ROM Then this most recent controlling instruction data is written into the random access memories RAM 8 and RPM 9 alternately. The controlling instruction data is a data for controlling opening and closing of the relevant switches and its required sequences for separating an accidental area when a trouble has happened in 20 a particular section or area, and for early recovering power supply to the normal areas. When CPU 11 judges occurrence of trouble in the distribution line 4 based on the most recent detecting data and condition data, CPU 11 reads out the controlling instruction data in one of the 2 memories RAM which is not in the rewriting condition, and transmits the data to all the slave 00 0 0 0 I c

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stations K through the communication device 7 as a form of data frame D. Furthermore, CPU 11 carries out operation for the necessary controlling instruction data for preparing expected trouble thereafter based on the transmitted controlling instruction data and writes-in this data to the other memory RAM which was in the refreshing condition.

The internal construction of the RAM 8, 9 is identical as is shown in Fig. 5. In this drawingr the 0 10 vertical column shows frame of accident area and addresses are allotted for each frame area, and the 0 00 0 "0 horizontal row shows frames for storing actuation controlling data for actuating switches provided at each 0 V of the slave stations. When the CPU 11 reads out the actuation instruction data therefrom at occurrence of earth connection accident, at first the address of the frame corresponding to the accident area of distribution i: line 4 where the earth connecting accident had happened is retrieved. The actuation instruction data in the corresponding frame to the relevant slave station is read out.

The construction of each slave station will be explained in detail.

Fig. 3 shows an electric construction of a slave 26 station K provided for one switch SS of the distribution line 4. The slave station K comprises a communication Sf device 12, a controller 13, a detector 14 formed of various kind of detecting devices for detecting the condition of the transformers, the voltmeters, the zero phase sequence component current detectors, the zero phase sequence component voltage detectors, etc., and an, actuator 15 as the actuation controlling means.

The communication device 12 has the mutual conversion function between the optical communication signal and the electric signal and is connected to the 10 communication line 5 between the master station 2 and 000 o G the slave station K.

o 0 000 The controller 13 is formed of units like CPU, ooo 0 0 0 i ROM and RAM and others and detects the condition of the t current, voltage, and the phase etc. of the area of :0 distribution line allotted to the slave station K based on the detected data sent from the detector 14 and -transmits the detected data to the master station 2 -through the communication device 12. The controller 13 also receives the controlling instruction data sent from the master station 2 through the communication device 12 and controls the actuation of the switch SS through the actuator The data frame D of each slave station K forming an overall continuous data frame D is as shown in 'Fig. 4. As an example, data frame D3 of the slave station K3 is shown in detail. This data frame D3 v' L

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ilL-..-UyL"-rrr.i i comprises an identification data which shows that this data frame is originated from a slave station K3.

It further comprises an identification data consisting of each data such as current, voltage, zero-phase sequence component current, zero-phase sequence component current, zero-phase sequence component voltage and phase etc. detected oy various detectors 14.

The condition data consists of a data of switch SS for switch-on and switch-off condition and of a self- 10 diagnosis data of the relevant slave station K3.

O0 0 o°o Further the controlling data consists of an actuation 00 control instruction data sent from the master station 2 i for the switch SS.

0 c 0 0 o0 The data frame D transmitted and received K 15 between the master station 2 and each slave station K is 0oo o transmitted through the communication line 5 in one direction. (In the illustrated embodiment shown in :I i Fig. 1, transmitted in clockwise direction.) The function and effect of the supervising system for distribution lines having the construction as set forth above will be explained hereinafter.

The each slave station K shown in Fig. 1 writes-in the detecting data and the condition data into the own data frame D and transmits thus recorded data to the master station at each predetermined time.

The master station 2 receives the predetermined time oY 0 4 v.f I 1_1 data frame D through its communication device 7.

The CPU 11 of the master station 2 will carry out an operation to derive the actuation control data for each slave station based on the most recent detecting data and condition data of the slave station and stores the instruction data into two memories RAM 8 and RAM 9 flalternately.

When the CPU 11 of the master station 2 judges an occurrence of a trouble based on the most recent detecting data, it carries out interrupting routine and immediately discontinue the operation and the rewriting I° of actuation instruction data, and identifies the area of the distribution line in trouble and a suitable operation instruction data to treat the trouble is read out from another RAM 9 of which data is not under refreshing. This operation instruction data in a relevant data frame and transmit it to all the slave j stations K via the communication device 7. The CPU 11 4 further carries out an operation to derive an operation i4 20 instruction data for an expected condition occurring thereafter based on the operation instruction data just transmitted previously and writes-in this data to the RAM 8 which had been in refreshing condition.

On the other hand each slave station K read-out 26 the own data frame among the transmitted data frames D through the communication device 12 and the controller 7 ~9 c,, i oos ~sac I~s~~r i:'d a13 s ji 9 i:-i

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r i 1 .i ij P' .d i 13 and the actuator 15 will operate to control the actuation of the switch SS according to the content of the operation controlling instruction. The condition of the power supply of the distribution line 4 in the own distribution area is detected by the various detectors in the detector 14 of the slave station K and transmits to the master station 2 after writing in the own data frame D.

As has been explained in the foregoing, when a trouble had happened in the distribution line network 3, the master station 2 reads-out an operation instruction data calculated by the data such as detecting data and conditions data of each of the slave stations K from the other RAM 9 being not in the 15 refreshing condition and by transmitting this controlling instruction to all the slave stations K so that only the trouble area can be separated very quickly.

By providing two memories RAM 8 and RAM 9 which 20 memorizes the most recent controlling instruction calculated by the CPU 11 in the master station 2 alternately, even an earth trouble has happened during a time when the CPU is in operation for the controlling instruction, the controlling iistruction can be read out 25 from the other RAM so that an early response against a trouble can be made.

-'1 1A: When the CPU 11 judges an occurrence of a trouble it transmits a controlling instruction to the respective slave stations K and at the same time the CPU 11 calculates a required controlling instruction for 06 the preparation of expected conditions thereafter based on the transmitted instruction and stores this instruction into the other RAM 8 which was in refreshing condition. By this always a suitable controlling instruction is kept in the master station to treat any 0:o 10 kind of trouble so that a flexible response against an occurrence of trouble is possible.

As has been explained above, according to the present invention, a controlling instruction is So calculated based on the detecting data and condition data of all the slave stations and memorize it, a quick response against occurrence of trouble can be obtained..

By using 2 set of memory means and storing the 1 operation controlling instruction alternately, even a trouble is happened during the calculating operation of the operational means, a quick separation of trouble area and an early power supply to the non-trouble area can be taken to treat the trouble condition.

By providing a second operational means at the master station and arranging to calculate the controlling instruction data to respond to an expected co dition after the first response to the trouble based,

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-7 on the controlling instruction data transmitted to the slave stations from the commiunication device, a more flexible response can be expected.

-Thp -nfpnnce~ numex-als. dn, the -following--claims-do- notnia- ,'Ia 7i~ 1rnI th o c C CC 00CC 0CC C ~0.0~C

Claims

1. A supervising system for distribution lines comprising in combination; slave stations having actuation controlling means for controlling actuation of distribution devices provided for each section of the distribution lines of a distribution line network based on actuation instruction data, detecting means for detecting occurrence of trouble in the distribution lines, and communication means for transmitting detecting data and condition data detected by said detecting means C in relation to the respective slave stations and receiving said actuation instruction i 10 data addressed to said slave stations, and a master station having communication means for receiving detecting data ell, C tCand condition data of each of the slave stations, processing means for calculating an optimum actuation controlling instruction data for actuating various distribution devices based on said data at a time when a problem has occurred in a distribution line, memory means for memorizing the above calculated actuation instruction data, judging means for judging the faulty section based on the most recently transmitted detection data concerning.the slave.:stations, and transmitting means for. transmitting the actuation-instruction. data for the faulty section-of.which data read out by the judging means from said memory means, said memory means comprising two parts which can be alternately read and refreshed such that one part can be refreshed by input of updated actuation instruction data while the other part is being read.

2, A supervising system for distribution lines comprising in combination; slave stations having actuation controlling means for controlling actuation of distribution devices provided for each section.of the distribution lines of a distribution line network based on actuation instruction data, detecting means for detecting occurrence of trouble in the distribution lines, and communication means for transmitting detecting data and condition data detected by said detecting means in relation to the respective slave stations and receiving said actuation instruction data addressed to said slave stations, and Ad- a master station having communication means for receiving detecting data. 17 and condition data of each of the slave stations trar,smitted therefrom at a certain predetermined time interval, processing means for calculating an optimum actuation controlling instruction data for various distribution devices for each section when trouble occurs, two memory means for alternately memorizing the various actuation controlling instruction calculated by the processing means based on the various data transmitted at each predetermined time interval, judging means for judging the faulty section based on the most recently transmitted detecting data concerning a relevant slave station, and a transmitting means for transmitting to the slave station Ct the controlling instruction data corresponding to the faulty section read out from one of the two memory means being not in refreshing condition.

3. A supervising system for distribution lines comprising in combination; i I slave stations having actuation controlling means for controlling actuation of distribution devices provided for each section of the distribution lines of a distribution line network based on actuation instruction data, detecting means for 0detecting occurrence of trouble in the distribution lines, and communication means 041 for transmitting detecting data and condition data detected by said detecting means in relation to the respective slave stations and receiving said actuation instruction 0 E data addressed to said slave stations, and a master station having communication means for receiving detecting data and condition data of each of the slave stations transmitted therefrom at a certain 4 predetermined time interval, processing means for calculating an optimum actuation controlling instruction data for various distribution devices for each section at occurrence of trouble, two memory means for alternately memorizing the various actuation controlling instruction calculated by the processing means based on the various data transmitted at each.predetermined time interval, judging means for judging the faulty section based on the most recently transmitted detecting data concerning a relevant slave station, and a transmitting means for transmitting to the slave station controlling instruction data corresponding to the faulty section read out from one of the two memory means being not in refreshing condition, and further having a second processing means for-calculating further actuation, instruction data for use in relation to a further expected trouble condition when the i 18 judging means has judged an occurrence of trouble based on the actuation controlling data transmitted by the transmitting means to the slave stations and for memorizing the further actuation instruction data by supplying it to the other one of the memory means being in refreshing condition,

4. A supervising system for distribution lines substantially as hereinbefore described with reference to the accompanying drawings. DATED this 20th day of August, 1990. NGK INSULATORS, LTD by its Patent Attorneys oI,, DAVIES COLLISON C C r'' il a 9qS020,edspeXJ9,31425.apc,2