JP4960328B2 - Network power transmission protection device - Google Patents

Description

  The present invention relates to a network power transmission protection device that protects a power transmission system configured in a loop by connecting a plurality of electric stations including an electric station connected to a power supply system through power transmission lines having circuit breakers at both ends.

  Generally, in the power transmission system, when an accident such as a short circuit or a ground fault occurs, the power transmission system is protected by a protective relay that operates the circuit breaker by identifying the position and type of the accident. The conventional power transmission line protection method performs protection independently for each power transmission line. On the other hand, in recent years, a loop-system power transmission system has been implemented in which a plurality of electrical stations including a power source and a circuit breaker are arranged and these are connected in a loop shape by a power transmission line (for example, , See Patent Document 1).

  FIG. 7 shows a configuration of a protection device in such a loop-shaped power transmission system. FIG. 7 is a configuration diagram when there are four electrical stations.

  In FIG. 7, the power transmission system includes four electric stations 11 to 14 and power transmission lines 41 to 44 that connect these electric stations. Of the four electric stations 11 to 14, the electric station 11 is connected to the power supply system 71, and the other electric stations 12, 13, and 14 are connected to the load system (not shown). The power transmission lines 41 to 44 connected in a loop shape by connecting the plurality of electric stations 11 to 14 are provided with circuit breakers 31 and 31a, 32 and 32a, 33 and 33a, 34 and 34a, respectively.

  Of the plurality of electric stations 11 to 14, one electric station 11 is provided with an arithmetic station 21, and the remaining electric stations 12, 13, and 14 are provided with terminal stations 22, 23, and 24, respectively. Yes. Information can be exchanged between the arithmetic station 21 and the plurality of terminal stations 22, 23, 24 by communication means including communication lines 61, 62, 63, 64, and constitutes a set of protection systems 60 as a whole. is doing.

  Current transformers 51 and 51a, 52 and 52a, 53 and 53a, 54 and 54a are provided at both ends of each of the power transmission lines 41, 42, 43 and 44 for input of measuring means (not shown). The amount of electricity flowing through the transmission line is extracted individually. In addition, the measuring means is comprised in the calculation station 21 or the terminal stations 22, 23, 24 provided in each electric station 11, 12, 13, 14.

  In the above configuration, the amount of electricity flowing through the power transmission lines 41 and 44 connected to the electric station 11 is measured by the measuring means of the arithmetic station 21, and the amount of electricity flowing through the power transmission lines 41 and 42 connected to the electric station 12 is The amount of electricity measured by the measuring means 22 and flowing through the transmission lines 42 and 43 connected to the electric station 13 is measured by the measuring means of the terminal station 23 and the electricity flowing through the transmission lines 43 and 44 connected to the electric station 14 The quantity is measured by the measuring means of the terminal station 24. The electrical quantity information measured by these terminal stations 22 to 24 is transmitted to the computing station 21 via the carrier network communication lines 61 to 64.

  The computing station 21 detects the presence or absence of an accident for each transmission line by obtaining a difference current ratio between both ends of each transmission line on the basis of the electrical quantity information of each transmission line received from each terminal station 22, 23, 24. When an accident occurs, a shut-off command for the circuit breakers at both ends of the failure section where the accident occurs is sent to the shut-off control circuit (not shown) of each of the electric stations 11 to 14 or the other terminal stations 22, 23, 24. Output via. For example, when the computing station 21 detects an accident in the transmission line 41 in FIG. 1, the computing station 21 outputs a failure cutoff command for the one-way circuit breaker 31 of the transmission line 41 from the own station 21 and the carrier network communication line 61. Is transmitted to the terminal station 22 through the terminal block 22 through the failure interrupt command to the other end circuit breaker 31a. The shut-off control circuit of the arithmetic station 21 opens the one-way circuit breaker 31 in response to a fault shut-off command from the own station. The terminal station 22 outputs a release command to the circuit breaker 31a in response to the failure cutoff command received from the arithmetic station 21. By the above, the circuit breakers 31 and 31a of the both ends of the power transmission line 41 which is a failure area are open | released, and the power transmission line 41 is protected.

  Further, when an accident occurs in the transmission line 42, the computing station 21 determines that the accident has occurred in the transmission line 42 based on the electrical quantity information at both ends of the transmission line 42 sent from the terminal stations 22 and 23. To detect. Then, in order to open the circuit breakers 32 and 32 a provided at both ends of the power transmission line 42, a failure interruption command for the circuit breakers 32 and 32 a is transmitted to the corresponding terminal stations 22 and 23 via the carrier network communication lines 61 and 62. To do. The terminal stations 22 and 23 output an open command to the circuit breakers 32 and 32a in response to the failure interrupt command received from the arithmetic station 21. As described above, the circuit breakers 32 and 32a at both ends of the power transmission line 42, which is the failure section, are opened, and the power transmission line 42 is protected.

The above operation is the same for the other power transmission lines 43 and 44. That is, the accident of the power transmission line 43 corresponds to the accident of the power transmission line 42, the accident of the power transmission line 44 corresponds to the accident of the power transmission line 41, and is the same as the description of the accident of the corresponding power transmission lines 41 and 42, respectively. To work.
Japanese Patent Laid-Open No. 9-233684

  In this way, the arithmetic station 21 obtains information from each of the terminal stations 22, 23, and 24, detects an accident that has occurred in the power transmission lines 41 to 44, isolates the failure section in which the accident has occurred, and returns to the healthy section. Maintain power.

  However, if an abnormality occurs in any one or more of the terminal stations 22, 23, and 24, information from the terminal station that has become abnormal (for example, 22) cannot be obtained in the computing station 21. That is, since the terminal station 22 cannot measure the amount of electricity flowing through the power transmission lines 41 and 42 connected to the electric power station 12, the arithmetic station 21 detects this accident even if an accident occurs in the power transmission line 41 or 42. I can't. For this reason, the circuit breakers 31a and 32 cannot be interrupted at the electric station 12 by a command from the arithmetic station 21, and the fault section cannot be disconnected. In this case, a protection device (not shown) that protects the entire transmission lines 41 to 44 connected in a loop operates, and the circuit breakers 31 and 34a closest to the power supply system 71 are opened to transmit the transmission lines 41 connected in a loop. Protect the entire ~ 44.

  As described above, when any one of the terminal stations 22, 23, and 24 becomes abnormal, the entire loop-shaped power transmission lines 41 to 44 including the healthy section are disconnected, so that the power outage range is expanded.

  It is an object of the present invention to reliably protect a transmission line when an accident occurs in a transmission line connected in a loop, to minimize the power outage range, and to quickly disconnect a failure section. It is to provide a network power transmission protection device that can be used.

  The network power transmission protection device of the present invention is a network that protects a power transmission system configured in a loop by connecting a plurality of electric power stations including an electric power station connected to a power supply system through power transmission lines provided with breakers at both ends. A power transmission protection device, which is provided at each end of each power transmission line and individually measures the amount of electricity flowing through the corresponding power transmission line, and two sets provided at one of the plurality of electrical stations There are two sets of terminal stations provided in the calculation station and other electric stations, and the electric power measured by the measurement means between the calculation station and the plurality of terminal stations by the communication means for each set. Two sets of protection systems capable of sending and receiving various types of information including quantity information, and the computing station and each terminal station of these two sets of protection systems, each monitoring the presence / absence of abnormality of the own station and other stations, respectively. Self and mutual monitoring means, The electrical control station is provided for each of the circuit breakers, and is provided for each of the operation control circuits of the two protection systems, and the circuit break control circuit for opening the corresponding circuit breaker, and each of the measurement units measured by the measurement means. Collect the electrical quantity information at both ends of the transmission line from the corresponding terminal station for each protection system, detect the presence or absence of failure for each transmission line from the electrical quantity information at both ends of each transmission line for each protection system, In this case, the failure section is provided with a failure section detecting means for outputting a break command for breaking the breakers at both ends of the failure section to the break control circuit of each electric station via the own protection station or another terminal station. The detecting means, when the self / mutual monitoring means detects an abnormality of any of the terminal stations, expands a plurality of transmission lines connected to the electric station having the detected abnormal terminal station as one section in series, Electric quantity at both ends of this expanded section Based on the section extension detection function for determining whether or not there is a failure in the corresponding extension section based on each protection system, and the shutdown command output from each protection system to the circuit breaker to be shut down is It is determined for each protection system whether or not the target circuit breaker is located at the end of the extension section, and the protection system determined to be located at the end of the extension section is a command to shut off the extension instantaneous element and the extension time limit element. The protection system that has determined that it is not in the extended section outputs a section instantaneous element shut-off command, and the shut-off control circuit outputs the shut-off that is output from the two sets of protection systems provided in its own electrical station. Of the commands, the logical product of one set of section instantaneous elements and the other set of extended instantaneous elements or the other set of section instantaneous elements, one set of section instantaneous elements or one set of extended instantaneous elements and the other set Logical AND with one set of interval instantaneous elements, expansion of one set A logical product of the time limit element and the other set of extended time limit elements, each of which is ORed to open the corresponding circuit breaker, and for each of the two sets of protection systems, A bypass circuit is provided for each element of the shut-off command, and when an abnormality in either one of the two protection systems provided at the self-electricity station is detected by the self / mutual monitoring means, the fault protection system shuts off. It is characterized in that the command is bypassed, and when the two protection systems provided in the own electric station are abnormal, the shut-off command is not bypassed by the abnormality protection system.

  According to the present invention, each electric station constituting the loop-shaped power transmission system is provided with two sets of a computing station, a plurality of terminal stations, and two protection systems capable of exchanging information with each other. Even if any of the constituent stations becomes abnormal, the other protection system in which no abnormality has occurred can reliably protect the transmission line and minimize the power outage section.

  Hereinafter, an embodiment of a network power transmission protection device according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an embodiment of the present invention. The loop-shaped power transmission system to be protected is basically the same as that shown in FIG. 7, and includes four electric stations 11 to 14 and power transmission lines 41 to 44 connecting the electric stations. Of the four electric stations 11 to 14, the electric station 11 is connected to the power supply system 71, and the other electric stations 12, 13, and 14 are connected to a load system (not shown). The power transmission lines 41 to 44 are provided with circuit breakers 31 and 31a, 32 and 32a, 33 and 33a, 34 and 34a at both ends, respectively.

  One electric station 11 is provided with a calculation station 21, and the remaining electric stations 12, 13, and 14 are provided with terminal stations 22, 23, and 24, respectively. Information can be exchanged between the arithmetic station 21 and the plurality of terminal stations 22, 23, 24 by communication means including communication lines 61, 62, 63, 64, and constitutes a set of protection systems 60 as a whole. is doing.

  In addition, another set of protection systems 60a having the same configuration is provided, and the loop-shaped power transmission system is protected by two sets of protection systems 60 and 60a. The other protection system 60a also includes a calculation station 21a provided in one electric station 11, and terminal stations 22a, 23a, and 24a provided in the remaining electric stations 12, 13, and 14, and these calculation stations are provided. Between 21a and the plurality of terminal stations 22a, 23a, 24a, information is exchanged by communication means including communication lines 61a, 62a, 63a, 64a.

  Current transformers 51 and 51a, 52 and 52a, 53 and 53a, 54 and 54a are provided at both ends of each of the power transmission lines 41, 42, 43 and 44, respectively, and the amount of electricity flowing through the corresponding power transmission lines is individually determined. Extract and output to the measuring means described later.

  The arithmetic stations 21 and 21a have basically the same configuration, and each includes a measuring unit 101, a failure section detecting unit 102, a communication unit 103, and a self / mutual monitoring unit 104 as shown in FIG. Also, the terminal stations 22 and 22a, 23 and 23a, 24 and 24a have basically the same configuration, and include a measuring unit 201, a communication unit 203, and a self / mutual monitoring unit 204 as shown in FIG. 3 shows the terminal stations 22 and 22a, the other terminal stations 23 and 23a, 24 and 24a have the same internal configuration.

  The measuring means 101 of the arithmetic stations 21 and 21a is connected to the secondary circuit of the current transformers 51 and 54a provided in the electric station 11, and measures the amount of electricity of the power transmission lines 41 and 44. The measuring means 201 of the terminal stations 22 and 22a (23 and 23a, 24 and 24a) is the secondary of the current transformers 51a and 52 (52a and 53, 53a and 54) provided in the electric station 12 (13, 14). Connect to the circuit and measure the amount of electricity in the transmission lines 41 and 42 (42 and 43, 43 and 44).

  The current values measured by the measuring means 201 of each of these terminal stations 22 and 22a, 23 and 23a, 24 and 24a are converted into digital signals to become electric quantity information, and the communication of the corresponding protection system 60 or 60a from the communication means 203, respectively. It is sent to the communication means 103 of the arithmetic station 21 or 21a via the lines 61, 62, 63, 64 or 61a, 62a, 63a, 64a and inputted to the failure section detection means 102. The current value measured by the measuring means 101 of the arithmetic stations 21 and 21a is also converted into a digital signal and input to the failure section detecting means 102 of the own station as electric quantity information.

  The failure section detecting means 102 of each arithmetic station 21, 21 a includes the electric quantity information measured by the measuring means 101 of the own station and the terminal stations 22, 23, 24 and 22 a, 23 a, 24 a collected by the communication means 103. The electric current information measured by the measuring means 201 is used to obtain a difference current ratio between both ends of each of the transmission lines 41 to 44, and the presence or absence of an accident for each transmission line is detected for each of the protection systems 60 and 60a.

  That is, when there is no accident in each of the power transmission lines 41 to 44, the current measurement values at both ends thereof are substantially equal to each other in the same direction. However, when an accident occurs in the power transmission lines 41 to 44, the directions of the currents at both ends of the accident power transmission line are opposite to each other (inward), so that the difference current ratio at both ends of the accident power transmission line increases. The failure section detection means 102 determines that an accident has occurred in this power transmission line if the difference current ratio between both ends of the power transmission line exceeds a threshold value.

  When the fault section detecting means 102 detects a power transmission line in which an accident has occurred by such an accident detection function, the fault control unit 102 has a corresponding circuit breaker to cut off the circuit breakers at both ends of the fault section where the accident has occurred. A cutoff command is output to the circuits 106 and 206. For example, when an accident occurs in the power transmission line 41, the failure section detection unit 102 detects the breakers 31 and 31a at both ends of the power transmission line 41, which is the failure section, of the electrical stations 11 and 12 where they are installed. The interruption | blocking command with respect to the circuit breakers 31 and 31a is output to the interruption | blocking control circuits 106 and 206. FIG.

  Here, since the failure section detection means 102 is provided in each of the arithmetic stations 21 and 21a constituting the two protection systems 60 and 60a, the failure interruption command to the interruption control circuits 106 and 206 is sent to both protection systems 60 and 60a. , 60a. That is, at the electric station 11 where the two arithmetic stations 21 and 21a are installed, as shown in FIG. 4, the shutoff command 1 is output from the arithmetic station 21 constituting one of the protection systems 60 to the shutoff control circuit 106. Then, the shutoff command 2 is output from the arithmetic station 21a constituting the other protection system 60a. That is, for the electric station 11, the shut-off command 1 from one protection system 60 is output from the arithmetic station 21 provided in the own power station 11, and the shut-off command 2 from the other protection system 60a is also the same as the self-electricity The circuit breaker 3 (31 or 34a of the electric station 11) is opened by being output from the arithmetic station 21a provided at the station 11 and turning on both of them. Further, in the electric station 12 where the two terminal stations 22 and 22a are installed, as shown in FIG. 5, the shutdown command 1 is output from the terminal station 22 constituting one protection system 60 to the shutdown control circuit 206. Then, the shut-off command 2 is output from the arithmetic station 22a constituting the other protection system 60a. Although FIG. 5 shows the electric station 12, the same applies to the other electric stations 13 and 14.

  The self / mutual monitoring means 104 and 204 provided in the arithmetic stations 21 and 21a and the terminal stations 22, 22a to 24 and 24a have a function of monitoring whether the own station is in a healthy state and whether other stations are healthy. . That is, each station 21 and 21a, 22 and 22a, 23 and 23a, 24 and 24a has abnormality detection contacts 105, 205,... That operate when an abnormality occurs, as shown in FIGS. The state of the own station is monitored according to the state of the contacts 105, 205,..., And the contact state is also monitored for other adjacent stations via the communication means 103, 203,. , It monitors each other whether its own station and other stations are healthy. The abnormality detection information from the terminal stations 22, 22a to 24, 24a to the arithmetic stations 21, 21a is transmitted through a remote monitoring transmission line (not shown). In any case, the computing stations 21 and 21a and the terminal stations 22, 22a to 24, and 24a are mutually monitored, and have a function of specifying a station where an abnormality has occurred.

  As described above, the failure section detection means 102 is provided in each of the two computation systems 21 and 21a of the protection system, and the electrical quantity information at both ends of the power transmission lines 41 to 44 is obtained from the protection systems 60 and 60a. Separately collected from the corresponding terminal stations 22 to 24 and 22a to 24a, and the presence / absence of a failure for each of the power transmission lines 41 to 44 is detected for each protection system 60 and 60a from these electric quantity information. And when there exists a failure, the interruption | blocking command for breaking off the circuit breaker of both ends of a failure area is output to the interruption | blocking control circuits 106 and 206 of each electric station 11-14.

  When the self / mutual monitoring means 104, 204 detects an abnormality in any of the terminal stations 22-24, 22a-24a, the failure section detection means 102 is an electric station (for example, 12) that has the detected abnormal terminal station. The plurality of power transmission lines 41 and 42 connected to () are expanded as one section in series. And it has the section expansion detection function which determines the presence or absence of the failure in a corresponding expansion section separately for each protection system 60 and 60a based on the both-ends electric quantity of this expanded section.

  In addition, as described above, the failure section detection means 102 outputs the shut-off commands 1 and 2 to the breaker to be shut off accompanying the detection of the fault section of the power transmission line from each of the protection systems 60 and 60a. That is, first, it is determined for each protection system 60, 60a whether or not the circuit breaker to be interrupted is located at the end of the extended section due to the abnormality of the terminal station. Then, the protection system 60 or 60a determined to be located at the end of the extended section outputs the cutoff command for the extended instantaneous element 1c or 2a and the extended time limit element 1d or 2d as the cutoff command 1 or 2, and will be described later with reference to FIG. The corresponding contact in the interruption control circuit 106 or 206 to be turned on is turned on. On the other hand, the protection system 60 or 60a determined not to be in the extended section outputs the section instantaneous element 1a or 2b and 1b or 2c block command as the block command 1 or 2, and the corresponding contact described later with reference to FIG. Turn it on.

  The shutoff control circuits 106 and 206 are provided to shut off the circuit breakers installed at the electrical stations 11 to 14, respectively. As shown in FIGS. 4 and 5, the shutoff commands 1 and 2 from the two sets of protection systems 60 and 60a are input to the shutoff control circuits 106 and 206, respectively. For this reason, as shown in FIG. 6, the shut-off control circuits 106 and 206 are connected to the shut-off commands 1 and 2 output from the two sets of protection systems 60 and 60a provided in the self-electricity station. And the corresponding circuit breaker 3 is opened.

  That is, the shutoff control circuits 106 and 206 have one set of the section instantaneous elements 1a and the other set of the shutoff commands 1 and 2 output from the two sets of protection systems 60 and 60a provided in the own power station. Logical product of the extended instantaneous element 2a or the other set of section instantaneous elements 2b, one product of the section instantaneous element 1b or one set of extended instantaneous elements 1c and the other set of section instantaneous elements 2c, Corresponding contacts are connected so as to constitute the logical product of the expansion time limit element 1d of the other set and the expansion time limit element 2d of the other set, and the corresponding circuit breaker 3 is obtained by taking the logical sum of all the logical products. It is configured to open.

  Moreover, the interruption | blocking control circuits 106 and 206 have the bypass circuits 111 and 112 with respect to each element of interruption | blocking instruction | commands 1 and 2, respectively for every 2 sets of protection systems 60 and 60a, as shown in FIG. Among these, the bypass contact 111a of the bypass circuit 111 is connected in parallel to the section instantaneous element 1b and the extended instantaneous element 1c of the cutoff command 1, and the bypass contact 111b is connected in parallel to the extended time limit element 1d of the cutoff command 1. Connected, bypassing the corresponding elements by their on operation. The bypass contact 112a of the bypass circuit 112 is connected in parallel to the extended instantaneous element 2a and the section instantaneous element 2b of the cutoff command 2, and the bypass contact 112b is connected in parallel to the extended time limit element 2d of the cutoff command 2. The corresponding elements are bypassed by their ON operation.

  These bypass circuits 111 and 112 are connected to the abnormality protection system (60) when an abnormality is detected in one of the two protection systems 60 and 60a provided in the own electric station by the self / mutual monitoring means 104 and 204. Alternatively, the cutoff command 1 or 2 according to 60a) is bypassed. However, when the two sets of protection systems 60 and 60a provided in the own electric station are abnormal, the bypass command is not bypassed by the abnormality protection system.

The protection operation of the loop power transmission system by the two sets of protection systems 60 and 60a is basically the same, and when the arithmetic stations 21 and 21a detect an accident in any section of the power transmission lines 41 to 44, the terminal Accident detection as shown in Table 1 is performed according to the abnormal state of the stations 22 to 24 or the terminal stations 22a to 24a, and a failure cut-off command is transmitted to the terminal station having a break detection section both-end circuit breaker.

  Hereinafter, the occurrence of an abnormality in the terminal stations 22 to 24 and the terminal stations 22a to 24a and the protection operation by the section extension function will be described in different patterns using Table 1.

  As shown in Table 1, the abnormal state of the terminal station is 64 patterns. Among these, the basic operation will be described in the case where the terminal stations 22 to 24 and 22a to 24a of (Pattern 1) are all normal, and then the terminal station has an abnormality taking the following six typical patterns as an example. The protection operation when it occurs will be described.

(Pattern 2): When only one of the two sets of terminal stations provided at all electrical stations becomes abnormal (Pattern 16): Of the two sets of terminal stations provided at all electrical stations, When one set is abnormal and only one other set is abnormal (Pattern 28): Of two sets of terminal stations provided at all electric stations, only two units at the same electric station are abnormal (Pattern 35) ): When one set of two terminal stations provided at all electric power stations and only one other set are abnormal (Pattern 41): Two sets of terminal stations provided at all electric power stations If one set and one set are abnormal (Pattern 59): Of the two sets of terminal stations provided at all electric power stations, one set of two sets and the other set of two sets Case of Abnormality The details of each of the above patterns will be described below.

(Pattern 1)
When the computing stations 21 and 21a detect an accident in any of the power transmission lines 41 to 44, the computing station 21 cuts off the accident to the terminal stations 22 to 24 via the carrier network communication lines 61 to 63 according to the accident occurrence section. Send a command. The arithmetic station 21a also transmits an accident cutoff command to the terminal stations 22a to 24a via the carrier network communication lines 61a to 63a according to the accident occurrence section. The two sets of terminal stations (22 and 22a, 23 and 23a, and 24 and 24a) that have received the accident interruption command output an opening command to the circuit breaker, respectively. Since the shutoff control circuit 206 of each terminal station is configured by the logical product of the shutoff commands 1 and 2 by the two sets of terminal stations as shown in FIG. 6, the two sets of terminal stations are both connected to the same circuit breaker 3. Only when the opening commands 1 and 2 are output, the circuit breaker 3 is opened and the transmission line is protected. In this pattern 1, since the terminal stations 22 to 24 and 22a to 24a are all normal, when the accident occurs on the power transmission line (for example, 42), the circuit breakers 32 and 32a at both ends of the failure section where the accident has occurred. In the installed electric station (for example, 12, 13), two sets of terminal stations 22 and 22a, 23, and 23a are connected to the same circuit breaker 3 (32, 32a) with an opening command 1 (section instantaneous elements 1a, 1b) and 2 (Section instantaneous element 2b, 2c) is output. In this case, the circuit breaker sections 32 and 32a to be interrupted are the both-end circuit breakers 32 and 32a of the power transmission line 42 that is the failure section, and are not the circuit breakers of the extended section described above. 1b is turned on, and the section instantaneous elements 2b and 2c are turned on as the cutoff command 2. For this reason, in the interruption control circuit 206 of both circuit breakers 32 and 32a, the logical product of the section instantaneous elements 1a and 2b and the logical product of the section instantaneous elements 1b and 2c are established, respectively. 32, 32a) are instantaneously interrupted.

(Pattern 2)
This pattern 2 is a case where an abnormality has occurred in one of the two sets of terminal stations provided at all electric power stations, that is, the terminal station 22a.

  In such a state, when an accident occurs in the power transmission line 41, the computation station 21 uses the electrical quantity information of the transmission line 41 transmitted from the terminal station 22 and the electrical quantity information of the transmission line 41 measured by the computation station 21 itself. An accident in the transmission line 41 is detected. As a result, an opening command 1 (interval instantaneous elements 1a and 1b) to the circuit breaker 31 is output, and a failure interrupting command is output to the terminal station 22. The terminal station 22 that has received the failure cutoff command outputs the release command 1 (section instantaneous elements 1a and 1b) to the circuit breaker 31a.

  Further, since the terminal station 22a is abnormal, the arithmetic station 21a is expanded based on the electric quantity information of the power transmission line 42 transmitted from the terminal station 23a and the electric quantity information of the power transmission line 41 measured by the arithmetic station 21a itself. Accidents of the transmission lines 41 to 42 that are sections are detected. As a result, an opening command 2 (expansion instantaneous element 2a, expansion time limit element 2d) to the circuit breaker 31 is output, and a fault interruption command is output to the terminal station 23a. The terminal station 23a outputs the release command 2 (the extended instantaneous element 2a and the extended time limit element 2d) to the circuit breaker 32a in response to the failure cutoff command received from the arithmetic station 21a.

  Here, when an accident occurs in the power transmission line 41, the shut-off control circuits 106, 206,... Arranged at each electric station are logical products of the opening commands 1 and 2 by the two protection systems 60 and 60a. Since the circuit breaker 31 is configured, the release command 1 (interval instantaneous elements 1a and 1b) is issued by the sound computation station 21, and the release command 2 (extended instantaneous element 2a and expansion time limit element 2d) is issued by the computation station 21a. It is output. For this reason, the logical product of the section instantaneous element 1a and the extended instantaneous element 2a is established, and the opening operation is instantaneously performed. In the circuit breaker 31a, since the terminal station 22a is abnormal, the release command 1 (section instantaneous elements 1a and 1b) is output only from the terminal station 22. However, when the terminal station 22a is abnormal, the own station bypass circuit 112 shown in FIG. The logical product of the section instantaneous element 1a and the bypass contact 112a of the bypass circuit 12 is established, and the opening operation is performed. As for the circuit breaker 32a, the release command 2 (the extended instantaneous element 2a and the extended time limit element 2d) is output from the terminal station 23a as described above, but the bypass circuit 111 is not turned on because the terminal station 23 is normal. The release command 1 remains off. For this reason, it is not opened by the logical product configuration of FIG.

  As described above, when the terminal station 22a is abnormal and an accident occurs in the power transmission line 41, only the power transmission section 1 is opened. Even when an accident occurs in any of the power transmission lines 42, 43, 44, only one of the power transmission sections 2, 3, 4 corresponding to the power transmission line in which the accident has occurred is opened.

  This also applies to the other patterns 3 to 15, and if any one set of terminal poles is normal for all stations, no matter which of the other set of terminal stations is abnormal, Only one of the corresponding power transmission sections 1, 2, 3, 4 is opened.

(Pattern 16)
In this pattern 16, all the terminal stations 22, 23, 24 in one set and one terminal station 22a in the other set are abnormal.

  In such a state, when an accident occurs in the power transmission line 41, the computing station 21 uses the electric quantity information of the power transmission lines 41 and 44 measured by itself because the terminal stations 22, 23 and 24 of the same set are abnormal. Based on this, an accident in the extended section of the power transmission line 41 to the power transmission line 44 is detected, and the opening command 1 (the extended instantaneous element 1c and the extended time limit element 1d) is output to the circuit breakers 31 and 34a at both ends of the extended section. . Since the computing station 21a is abnormal in the same terminal station 22a, the computing station 21a is based on the electrical quantity information of the transmission line 42 transmitted from the adjacent terminal station 23a and the electrical quantity information of the transmission line 41 measured by the computing station 21a itself. , An accident in the extended section of the transmission line 41 to the transmission line 42 is detected, and an opening command 2 (expanded instantaneous element 2a, extended time limit element 2d) to one of the circuit breakers 31 at both ends of the expanded section is output. A fault interrupt command is output to the terminal station 23a to shut off the circuit breaker 32a. The terminal station 23a outputs the release command 2 (the extended instantaneous element 2a and the extended time limit element 2d) to the circuit breaker 32a in response to the failure cutoff command received from the arithmetic station 21a.

  Here, the circuit breaker 31 outputs the release commands 1 (the extended instantaneous element 1c and the extended time limit element 1d) and 2 (the extended instantaneous element 2a and the extended time limit element 2d) from the two sets of arithmetic stations 21 and 21a at the same time. Therefore, the logical product of the expansion time limit elements 1d and 2d in FIG. 6 is established, and the release operation is performed with a time limit. The circuit breaker 32a outputs only the opening command 2 (the extended instantaneous element 2a and the extended time limit element 2d) of the terminal station 23a. Further, since the terminal station 23 is abnormal, the own station bypass circuit 111 is turned on by its own device and the mutual monitoring means 204, the logical product of the bypass contact 111b and the expansion time limit element 2d is established, and the interruption is performed. The device 32a performs a release operation with a time limit by the release command 2 (expansion time limit element 2d) of only the terminal station 23a.

  Also, the opening command 1 is also output from the arithmetic station 21 to the circuit breaker 34a. However, since the arithmetic station 21a is normal, it is not opened due to the logical product configuration of the cutoff control circuit 106.

  As described above, when all the terminal stations 22, 23, and 24 in one set and one of the other sets (22 in pattern 16) are abnormal, two sets of terminal stations (22 and 22a in pattern 16) An electric station (12 in pattern 16) is generated. In this case, in the electric station 12 where the two sets of terminal stations 22 and 22a are abnormal, the amount of electricity of the transmission lines 41 and 42 connected to the electric station cannot be measured. When an accident occurs, the extended power transmission sections 1 and 2 including the power transmission line 41 are opened. Similarly, when an accident occurs on the power transmission line 42, the power transmission sections 1 and 2 are opened. When an accident occurs in the power transmission line 43, the terminal stations 23 and 24 in one set are abnormal in the electric stations 13 and 14 at both ends, but the terminal stations 23a and 24a in the other set are normal. The circuit breakers 33 and 33a at both ends are opened because the AND condition shown in FIG. 6 is satisfied, and only the power transmission section 3 is opened. Even when an accident occurs in the power transmission line 44, since there are normal terminal stations at the electric stations 11 and 14 at both ends, the AND conditions shown in FIG. 6 are established for the circuit breakers 34 and 34a at both ends. Therefore, it opens and only the power transmission section 4 is opened.

  These operations are the same for the other similar patterns 17 to 18 and 22 to 24, and are the same for the patterns 19 to 21 and 24 to 27 in which two sets of terminal stations have a plurality of electrical stations. . In either case, at the electric station where two sets of terminal stations become abnormal, the amount of electricity in the connected transmission line cannot be measured, so at least one of the terminal stations expands the section between the normal electric stations. Protection.

(Pattern 28)
This pattern 28 is a case where both sets of terminal stations 22 and 22a have an abnormal electric power station 12.

  When the terminal stations 22 and 22a are abnormal, if the accident occurs in the power transmission line 41, the arithmetic station 21 detects that the power of the power transmission line 42 transmitted from the adjacent terminal station 23 because the same set of terminal stations 22 is abnormal. An accident in the extended section of the power transmission line 41 to the power transmission line 42 is detected based on the quantity information and the electric quantity information of the power transmission line 41 measured by the computation station 21 itself. As a result, the release command 1 (expansion instantaneous element 1c, expansion time limit element 1d) to the circuit breaker 31 is output, and the fault interruption command is output to the terminal station 23. The terminal station 23 outputs the release command 1 (the extended instantaneous element 1c and the extended time limit element 1d) to the circuit breaker 32a in accordance with the failure cutoff command received from the arithmetic station 21. Since the same set of terminal stations 22a is abnormal, the arithmetic station 21a uses the electric quantity information of the power transmission line 42 transmitted from the adjacent terminal station 23a and the electric quantity information of the power transmission line 41 measured by the arithmetic station 21a itself. An accident in the power transmission line 41 to the power transmission line 42 expanded based on the detection is detected, and an opening command 2 (expansion instantaneous element 2a, expansion time limit element 2d) is output to the circuit breaker 31, and a fault interruption command is issued to the terminal station 23a. Output. The terminal station 23a outputs the release command 2 (the extended instantaneous element 2a and the extended time limit element 2d) to the circuit breaker 32a in response to the failure cutoff command received from the arithmetic station 21a.

  In this way, the circuit breaker 31 outputs the release commands 1 (expansion instantaneous element 1c, expansion time limit element 1d) and 2 (expansion instantaneous element 2a, expansion time limit element 2d) simultaneously by the arithmetic stations 21, 21a. 32a, since the release commands 1 (expansion instantaneous element 1c and expansion time limit element 1d) and 2 (expansion instantaneous element 2a and expansion time limit element 2d) are output simultaneously by the terminal stations 23 and 23a, the expansion time limit element 1d and The logical product with the extended time limit element 2d is established, and the release operation is performed with a time limit.

  As described above, in the electric station 12 where the two sets of terminal stations 22 and 22a are abnormal, the amount of electricity of the transmission lines 41 and 42 connected to the electric station cannot be measured. When an accident occurs in 41), the power transmission sections 1 and 2 including the power transmission line 41 are opened. Similarly, when an accident occurs on the power transmission line 42, the power transmission sections 1 and 2 are opened. When an accident occurs in the power transmission line 43, since both sets of terminal stations 23 and 23 a, 24 and 24 a are normal at the electric stations 13 and 14 at both ends, the circuit breakers 33 and 33 a at both ends are respectively Since the AND condition shown in FIG. 6 is satisfied, the opening operation is performed and only the power transmission section 3 is opened. Even if an accident occurs in the power transmission line 44, since the normal terminal stations 11 and 14 exist at the electric stations at both ends, the AND conditions shown in FIG. 6 are established for the circuit breakers 34 and 34a at both ends. The opening operation is performed and only the power transmission section 4 is opened.

  These operations are the same for the other similar patterns 29 to 30, and are the same for the patterns 31 to 34 in which there are a plurality of electrical stations where the two sets of terminal stations become abnormal. In either case, at the electric station where two sets of terminal stations are abnormal, the amount of electricity in the connected transmission line cannot be measured, so both sets of terminal stations can extend the section between normal electric stations. , Protection is done.

(Pattern 35)
This pattern 35 is a case where one terminal station 22 in one set of electric stations 12 and one terminal station 23a of the other set in another adjacent electric station 13 are abnormal.

  When the terminal stations 22 and 23a are abnormal in this way, when an accident occurs in the power transmission line 41, the computation station 21 is transmitted from the same set of terminal stations 23 adjacent thereto because the same set of terminal stations 22 is abnormal. Accidents in the extended sections of the transmission lines 41 to 42 are detected based on the information on the amount of electricity in the transmission line 42 and the amount of electricity in the transmission line 41 measured by the computing station 21 itself. As a result, the release command 1 (expansion instantaneous element 1c, expansion time limit element 1d) to the circuit breaker 31 is output, and the fault interruption command is output to the terminal station 23. The terminal station 23 outputs the release command 1 (the extended instantaneous element 1c and the extended time limit element 1d) to the circuit breaker 32a in accordance with the failure cutoff command received from the arithmetic station 21. The computing station 21a detects an accident in the transmission line 41 based on the electrical quantity information of the transmission line 41 transmitted from the same set of terminal stations 22a and the electrical quantity information of the transmission line 41 measured by the computing station 21a itself. As a result, an opening command 2 (interval instantaneous elements 2b and 2c) to the circuit breaker 31 is output, and a failure interrupting command is output to the terminal station 22a. The terminal station 22a that has received the failure cutoff command outputs the release command 2 (section instantaneous elements 2b and 2c) to the circuit breaker 31a.

  Here, since the circuit breaker 31 outputs the release commands 1 (extended instantaneous element 1c, extended time limit element 1d) and 2 (interval instantaneous elements 2b, 2c) simultaneously by the arithmetic stations 21, 21a, the extended instantaneous element 1c AND of the section instantaneous element 2c is established, and the opening operation is instantaneously performed. The circuit breaker 31a outputs the release command 2 (interval instantaneous elements 2b and 2c) only from the terminal station 22a. Circuit 111 is on. For this reason, the circuit breaker 31a establishes a logical product of the opening command 2 (section instantaneous element 2c) of the terminal station 22a only and the bypass contact 111a, and opens immediately. Further, the circuit breaker 32a outputs the release command 1 (extended instantaneous element 1c, extended time limit element 1d) only to the terminal station 23, and the terminal station 23a is abnormal, so that the local station bypass circuit 112 is turned on. Therefore, the circuit breaker 32a is logically controlled by the expansion time limit element 1d and the bypass contact 112b, and is controlled to be opened with a time limit.

  In this case, since both-end circuit breakers 31 and 31a of the power transmission section 1 and the circuit breaker 32a on one side of the power transmission section 2 are opened, the power transmission sections 1 and 2 are opened as the power transmission path. When an accident occurs in the power transmission line 42, only the both-end circuit breakers 32 and 32a are cut off, so that only the power transmission section 2 is opened. When an accident occurs in the power transmission line 43, the one-side circuit breaker 32 in the power transmission section 2 and the both-end circuit breakers 33 and 33a in the power transmission section 3 are opened, so the power transmission sections 2 to 3 are opened as a power transmission path. . When an accident occurs in the power transmission line 44, both end circuit breakers 34 and 34a are opened, so that only the power transmission section 4 is opened.

  On the other hand, as shown in pattern 36, one terminal station 22 in one set of electrical stations 12 and one terminal station 24a in the other set in other electrical stations 14 through a healthy section are abnormal. In this case, even if an accident occurs in any of the transmission lines 41 to 44, the circuit breakers at both ends of the transmission line in which the accident has occurred are opened. Therefore, the power transmission section 1 is opened for the power transmission line 41 accident, the power transmission section 2 is opened for the power transmission line 42 accident, the power transmission section 3 is opened for the power transmission line 43 accident, and the power transmission line 44 accident occurs. The power transmission section 4 is opened.

  These relationships are the same for the other patterns 37-40.

(Pattern 41)
This pattern 41 is a case where one terminal station 22 in one set and the two terminal stations 22a and 23a in the other set are abnormal.

  If the terminal station 22 and the terminal stations 22a and 23a are abnormal and an accident occurs in the power transmission line 41, the arithmetic station 21 has the same set of terminal stations 23 adjacent to this because the same set of terminal stations 22 is abnormal. Accidents of the extended power transmission line 41 to power transmission line 42 are detected based on the information on the amount of electricity of the power transmission line 42 transmitted from and the information on the amount of electricity of the power transmission line 41 measured by the computing station 21 itself. As a result, an opening command 1 (extended instantaneous element 1c, extended time limit element 1d) to the circuit breaker 31 is output, and a failure interrupting command is output to the terminal station 23. The terminal station 23 outputs the release command 1 (the extended instantaneous element 1c and the extended time limit element 1d) to the circuit breaker 32a in accordance with the failure cutoff command received from the arithmetic station 21. Since the computation station 21a is abnormal in the same set of terminal stations 22a and 23a, the electrical quantity information of the power transmission line 43 transmitted from the same set of terminal stations 24a adjacent thereto and the transmission line measured by the computation station 21a itself. An accident in the extended section of the power transmission line 41 to the power transmission line 43 is detected based on the electric quantity information 41. As a result, an opening command 2 (extended instantaneous element 2a, extended time limit element 2d) to the circuit breaker 31 is output, and a fault interrupting command is output to the terminal station 24a. The terminal station 24a outputs the release command 2 (the extended instantaneous element 2a and the extended time limit element 2d) to the circuit breaker 33a according to the failure cutoff command received from the arithmetic station 21a.

  Here, since the circuit breakers 31 output the release commands 1 (expanded instantaneous element 1c, extended time limit element 1d) and 2 (expanded instantaneous element 2a, extended time limit element 2d) simultaneously by the arithmetic stations 21, 21a, A logical product of the time limit element 1d and the extended time limit element 2d is established, and release control is performed with a time limit. Since the circuit breaker 32a outputs the release command 1 (extended instantaneous element 1c, extended time limit element 1d) only to the terminal station 23 and the terminal station 23a is abnormal, the local station bypass circuit 112 is turned on. The logical product of the expansion time limit element 1d and the bypass contact 112b is established, and the opening control is performed with a time limit. The circuit breaker 33a outputs the release command 2 (extended instantaneous element 2a, extended time limit element 2d) only to the terminal station 24a, but since the terminal station 24 is normal, the bypass circuit 111 is not turned on, and the logical product configuration Does not open.

  As described above, when the terminal station 22 and the terminal stations 22a and 23a are abnormal and an accident occurs in the power transmission line 41, the circuit breakers 31 and 32a are opened, so that the power transmission sections 1 and 2 are opened. Even when an accident occurs in the power transmission line 42, the power transmission sections 1 and 2 are opened by the same operation. When an accident occurs in the power transmission line 43, only the circuit breakers 33 and 33a are opened, so that only the power transmission section 3 is opened. When an accident occurs on the power transmission line 44, only the circuit breakers 34 and 34a are opened, so that only the power transmission section 4 is opened.

  The other patterns 42 to 58 are combinations when one terminal station of one set and two terminal stations of the other set are abnormal, and are released depending on the position of the terminal station where the abnormality occurred. Although the power transmission section is different, it is the same as the pattern 41 from the viewpoint of protection.

(Pattern 59)
The pattern 59 is a case where the two terminal stations 22 and 23 in one set and the two terminal stations 23a and 24a in the other set are abnormal.

  If the terminal stations 22 and 23 and the terminal stations 23a and 24a are abnormal and an accident occurs in the power transmission line 41, the arithmetic station 21 detects that the same set of terminal stations 22 and 23 is abnormal, and therefore the same set adjacent to the same set. Accidents in the extended sections of the transmission lines 41 to 43 are detected based on the information on the amount of electricity of the transmission line 43 transmitted from the terminal station 24 and the amount of electricity on the transmission line 41 measured by the arithmetic station 21 itself. . As a result, the release command 1 (expansion instantaneous element 1c, expansion time limit element 1d) to the circuit breaker 31 is output, and the fault interruption command is output to the terminal station 24. The terminal station 24 outputs the release command 1 (the extended instantaneous element 1c and the extended time limit element 1d) to the circuit breaker 33a in response to the failure cutoff command received from the arithmetic station 21. The computation station 21a detects an accident in the transmission line 41 based on the electrical quantity information of the power transmission line 41 transmitted from the same terminal station 22a and the electrical quantity information of the transmission line 41 measured by the computation station 21a itself. As a result, an opening command 2 (interval instantaneous elements 2b and 2c) to the circuit breaker 31 is output, and a failure interrupting command is output to the terminal station 22a. The terminal station 22a outputs the release command 2 (section instantaneous elements 2b and 2c) to the circuit breaker 31a in response to the failure cutoff command received from the arithmetic station 21a.

  Here, since the circuit breaker 31 outputs the release commands 1 (extended instantaneous element 1c, extended time limit element 1d) and 2 (interval instantaneous elements 2b, 2c) simultaneously by the arithmetic stations 21, 21a, the extended instantaneous element 1c AND of the section instantaneous element 2c is established and the opening control is instantaneously performed. The circuit breaker 31a outputs the release command 2 (interval instantaneous elements 2b and 2c) only to the terminal station 22a. However, since the terminal station 22 is abnormal, the local station bypass circuit 111 is turned on, A logical product with the bypass contact 111a is established, and the opening control is instantaneously performed. The circuit breaker 33a outputs the release command 1 (extended instantaneous element 1c, expansion time limit element 1d) only to the terminal station 24. However, since the terminal station 24a is abnormal, the local station bypass circuit 112 is turned on and the expansion time limit A logical product of the element 1d and the bypass contact 112b is established, and the opening control is performed with a time limit.

  As described above, since the both-end circuit breakers 31 and 31a in the power transmission section 1 and the one-side circuit breaker 33a in the power transmission section 3 are opened, the power transmission sections 1 to 3 are opened as the power transmission path. When an accident occurs in the power transmission line 42, the circuit breakers 32 and 33a are opened, so that the power transmission sections 2 to 3 are opened. Even when an accident occurs in the power transmission line 43, the circuit breakers 32 and 33a are opened, so that the power transmission sections 2 to 3 are opened. When an accident occurs on the power transmission line 44, the circuit breaker 32 on one side of the power transmission section 2 and the circuit breakers 34, 34a on the power transmission section 4 are opened, so that the power transmission sections 2 to 4 are opened as power transmission paths. The

  The other patterns 60 to 64 are combinations when the two terminal stations of one set and the two terminal stations of the other set are abnormal, and are released depending on the position of the abnormal terminal station. Although the power transmission section is different, it is the same as the pattern 59 from the viewpoint of protection.

  In this way, by providing two sets of protection systems 60, 60a, and by configuring the respective fault cutoff outputs 1, 2 and the fault cutoff output bypass circuits 11, 12 by means of the device's self / mutual monitoring means by logical product, the terminal Even when the station is abnormal, the power transmission line protection function can be maintained.

It is a system configuration | structure figure explaining one Embodiment of the network power transmission protection apparatus by this invention. It is a block diagram explaining the structure of the arithmetic station used for one embodiment same as the above. It is a block diagram explaining the structure of the terminal station used for one embodiment same as the above. It is a block diagram explaining the relationship with the interruption | blocking control circuit in the electric station which has two sets of arithmetic stations in one Embodiment same as the above. It is a block diagram explaining the relationship with the interruption | blocking control circuit in the electric station which has two sets of terminal stations in one Embodiment same as the above. It is a circuit diagram which shows the structure of the interruption | blocking control circuit in one Embodiment same as the above. It is a system configuration | structure figure explaining a prior art.

Explanation of symbols

1, 2, 13, 14 Electric station 21, 21a Arithmetic station 22, 22a, 23, 23a, 24, 24a Terminal station 41, 42, 43, 44 Transmission line 60, 60a Protection system 71 Power supply system 101 , 201 Measuring means 102 Failure section detecting means 103, 203 Communication means 104, 204 Self / mutual monitoring means

Claims (1)

A network power transmission protection device for protecting a power transmission system configured in a loop by connecting a plurality of electric power stations including an electric power station connected to a power supply system by power transmission lines provided with circuit breakers at both ends,
Measuring means that is provided at both ends of each of the transmission lines and individually measures the amount of electricity flowing through the corresponding transmission line;
There are two sets of arithmetic stations provided in one of the plurality of electric stations, and two sets of terminal stations provided in other electric stations, and the arithmetic station and the plurality of terminal stations are provided by communication means for each of these sets. Two sets of protection systems capable of exchanging various types of information including the electrical quantity information measured by the measuring means between the terminal stations of
Self-mutual monitoring means for monitoring the presence / absence of abnormality of the own station and other stations, provided in the arithmetic station and each terminal station of these two sets of protection systems,
A breaker control circuit that is provided for each breaker in the electrical station and opens the corresponding breaker; and
Collected from the terminal station corresponding to each protection system is the electrical quantity information of both ends of each transmission line provided by each calculation station of the two sets of protection systems and measured by the measurement means. The presence or absence of failure for each transmission line is detected from the electrical quantity information at both ends for each protection system, and when there is a failure, the same protection system is used for the shutdown control circuit at each electric station to send a shutdown command to shut off the circuit breakers at both ends of the failure section Fault zone detection means for outputting via its own station or other terminal station,
When the self / mutual monitoring means detects an abnormality in one of the terminal stations, the failure section detection means uses a plurality of power transmission lines connected to the electric station having the detected abnormal terminal station as one section in series. Expanded, having a section expansion detection function for determining the presence or absence of a failure in the corresponding expanded section based on the both-end electricity quantity of the expanded section for each protection system,
In addition, the interruption command output from each protection system to the circuit breaker to be interrupted determines whether or not the circuit breaker to be interrupted is located at the end of the extension section for each protection system, and The protection system determined to be located at the end of the section outputs a shutoff command for the extended instantaneous element and the expansion time limit element, and the protection system determined to be not the extended section outputs a shutoff command for the section instantaneous element,
The shut-off control circuit includes one set of section instantaneous elements and the other set of extended instantaneous elements or the other set of section instantaneouss among the shut-off commands output from two sets of protection systems provided at the self-electricity station. Logical AND of one set of interval instantaneous elements or one set of extended instantaneous elements and the other set of interval instantaneous elements, one set of extended time limit elements and the other set of extended time limit elements And the corresponding circuit breaker is opened by opening the corresponding circuit breaker, and each of the two protection systems has a bypass circuit for each element of the shut-off command. When an abnormality in either one of the two protection systems provided at the self-electricity station is detected by the self / mutual monitoring means, the shut-off command by the abnormality protection system is bypassed and provided at the self-electricity station. If the two protection systems are abnormal, Network transmission protection apparatus characterized by being configured so as not to bypass the blocking command by normal protection system.

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