JP2014138447A - Power transmission line protection device and power transmission line protection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power transmission line protection device and system capable of quickly discovering abnormality by detecting erroneous setting.SOLUTION: A power transmission line protection device A1 comprises: terminal identification number setting and storing means 15a for setting and storing a plurality of identification numbers of each of terminals including the device's own terminal and a partner terminal; own terminal information transmission means I 16a for transmitting a plurality of identification numbers of each terminal to a partner terminal through a transmission path; partner terminal information reception means I 18a for receiving a plurality of identification numbers of each terminal set to the partner terminal through the transmission path; identification number comparison means I 20a for comparing the received plurality of identification numbers of the partner terminal and a stored plurality of identification numbers of the partner terminal; and an output lock 22a for locking a function for performing current differential operation when a result of the comparison shows disagreement.

Description

  Embodiments described herein relate generally to a power transmission line protection device and a power transmission line protection system for protecting a power transmission line by transmitting an amount of electricity to each other via a transmission line.

  A digital current differential relay device (hereinafter referred to as “power transmission line protection device”) is installed at each terminal of the power system to protect the power transmission line. This power transmission line protection device is a device that samples the amount of electricity at each terminal at a constant period, transmits / receives digitally converted data between the terminals, and performs an accident determination calculation inside and outside the protection section.

FIG. 13 is a schematic diagram showing the principle of the digital current differential relay system when the power transmission line protection device is applied to a parallel two-line two-terminal power transmission line.
The power system shown in FIG. 13 has an A terminal and a B terminal interconnected by an L1 transmission line 101 and an L2 transmission line 102. In order to measure the amount of electricity at each terminal, current transformers 111 and 112 are installed at the A terminal, and current transformers 113 and 114 are installed at the B terminal. Moreover, in order to connect / disconnect with the power transmission lines 101 and 102, circuit breakers 121 and 122 are installed at the A terminal, and circuit breakers 123 and 124 are installed at the B terminal.

  Further, power transmission line protection devices A1 and A2 are provided on the A terminal side of the power transmission lines 101 and 102, and are associated with the current transformers 111 and 112, respectively. On the other hand, transmission line protection devices B1 and B2 are provided at the B terminals of the transmission lines 101 and 102, and are associated with the current transformers 113 and 114, respectively. Further, there is a digital connection between the transmission line protection device A1 and the transmission line protection device B1 of the L1 line transmission line 101 and between the transmission line protection device A2 and the transmission line protection device B2 of the transmission line 102 of the L2 line. An L1 line transmission line 131 and an L2 line transmission line 132 for transmitting data are provided.

  In the configuration shown in FIG. 13, each of the power transmission line protection devices A1, B1, A2, and B2 converts the current values input from the current transformers 111 to 114 associated therewith into digital quantities, and each transmission line 131, By transmitting and receiving each other via 132, current information of the counterpart terminal can be obtained.

  As an example, the case of the power transmission line protection device A1 installed at the A terminal of the power transmission line 101 of the L1 line will be described. The transmission line protection device A1 obtains the current value of the A terminal that is its own terminal from the current transformer 111, and the transmission line protection device B1 obtains the current value of the B terminal that is the counterpart terminal from the current transformer 113. Obtain. The current value captured at each terminal is obtained as current information transmitted through the transmission line 131 of the L1 line.

  As a result, the power transmission line protection device A1 executes the current differential calculation from the current information of both terminals, thereby interrupting the circuit breakers 121 and 123 installed at both terminals of the L1 line power transmission line 101 and identifying the fault location in the system. Exclude from

  The transmission line protection device using the digital current differential relay system as described above is used when the transmission line protection device that executes the current differential calculation and the transmission path for transmitting and receiving the current of each terminal are correctly connected. Only the original function can be obtained.

  In FIG. 13, as described above, the current data of each terminal of the power transmission lines 101 and 102 is transmitted and received with the counterpart terminal via the transmission lines 131 and 132, respectively. These transmission lines 131 and 132 use the same transmission route for the plurality of power transmission lines 101 and 102, and when the signal transmission devices 141, 142, 143, and 144 are installed in the transmission line, they are for the L1 line. And L2 line devices are configured in the same casing in most cases.

  When the transmission lines for a plurality of lines are configured in the same housing as described above, in the connection work for physically connecting the transmission line protection device and the transmission lines, the transmission lines 131 and 132 are indicated by broken lines in FIG. There is a possibility of incorrect connection. The figure shows a case where the transmission lines 131 and 132 and the power transmission line protection devices B1 and B2 are erroneously connected at the B terminal. In this case, for example, the power transmission line protection device A1 performs the current differential calculation based on the current information of the L1 line power transmission line of the A terminal and the current information of the L2 line power transmission line of the B terminal. The protection function may not be performed.

Next, a conventional detection method related to erroneous connection between the power transmission line protection device and the transmission line will be described.
As shown in FIG. 15, regarding the power transmission line protection device 1a and the power transmission line protection device 1b that are transmitting each other at different terminals, the power transmission line protection device 1a sets and stores each terminal identification number. Setting means 230a, own terminal identification number transmitting means 231a for transmitting the identification number of the own terminal to the counterpart terminal, counterpart terminal identification number receiving means 232a for receiving the identification number of the counterpart terminal, and the received identification number of the counterpart terminal An identification number comparison means 233a for comparing the stored identification numbers of the counterpart terminals and an alarm output means 234a for outputting an alarm when the comparison results do not match are provided.

  On the other hand, the power transmission line protection device 1b, like the power transmission line protection device 1a, sets each terminal identification number setting means 230b that sets and stores the identification number of each terminal, and the own terminal that transmits the identification number of the own terminal to the counterpart terminal Identification number transmitting means 231b, counterpart terminal identification number receiving means 232b for receiving the identification number of the counterpart terminal, identification number comparison means 233b for comparing the received identification number of the counterpart terminal with the stored identification number of the counterpart terminal, And an alarm output means 234b for outputting an alarm when the comparison results do not match.

  In order to detect an erroneous connection of a transmission line, first, each terminal identification number setting means 230a connects the identification numbers of the transmission line protection device 1a of the own terminal and the transmission line protection device 1b of the counterpart terminal from the outside. Set and save from the identification number setting device. As an example, the identification number input in the power transmission line protection device 1a is “power transmission line protection device 1a: X, power transmission line protection device 1b: Y”, and the identification number input in the power transmission line protection device 1b is “power transmission line protection device 1a”. : Y, power transmission line protection device 1b: X ".

  Each terminal identification number setting means 230a extracts the identification number X of the power transmission line protection device 1a of its own terminal from the set identification numbers, and the other terminal via the transmission line by the own terminal identification number transmission means 231a. To the power transmission line protection device 1b. In this case, in the transmission line protection device 1b of the counterpart terminal, the identification number X of the transmission line protection device 1a is obtained by the counterpart terminal identification number receiving means 232b.

  On the other hand, in the self-terminal transmission line protection device 1a, the counterpart terminal identification number receiving means 232a receives the identification number X of the transmission line protection device 1b from the transmission line protection device 1b, and the identification number comparison means 233a protects the transmission line. The identification number Y of the power transmission line protection device 1b stored in the device 1a is compared. As a result of the comparison, in order to detect the mismatch by the identification number comparison unit 233a, an alarm indicating the mismatch is output by the alarm output unit 234a. The alarm output unit 234a specifically performs screen display, alarm output to the outside, and the like. Even when the transmission line protection device and the transmission path can be communicated by incorrect setting by the method for avoiding erroneous connection, the operator can quickly find the abnormality of the transmission line protection device.

  Currently, transmissions used for power transmission line protection use communication devices and transmission systems dedicated to protection, and the protection devices are physically connected one-to-one. Further, since there is a restriction on the amount of transmission data that can be transmitted and received, there is a restriction on the transmission and reception of the identification number. However, in recent years, it has been considered to apply general-purpose communication to a transmission path due to the advancement of general-purpose communication technology. In this case, it is conceivable to connect a plurality of devices on the same network.

  When general-purpose communication is used for the power transmission line protection device, for example, an IP address is used for the identification number assigned to each device, and the other party connection destination is recognized by setting by a human system to transmit / receive electric quantity data. Conceivable. However, depending on the IP address setting method, the electrical quantity data can be communicated with each other, but there are cases where the device to be protected is erroneously recognized and can be transmitted / received.

  A case where such communication is possible but the setting is incorrect will be described with reference to FIGS. 16 to 18, taking a transmission line having two terminals as an example. The general-purpose communication network may be divided into a plurality of series units depending on the physical connection, or the transmission path setting may be virtually divided into the series units. An example of separation will be described.

  FIG. 16 is a configuration diagram of a system in which general-purpose communication is applied to a conventional power transmission line protection device. In this system, power transmission line protection devices A11, A12, B11, and B12 are installed on power transmission lines with two parallel lines and two terminals. These power transmission line protection devices A11, A12, B11, and B12 respectively have current differential calculation means I 6e, 6g, 6f, and 6h and current differential calculation means II 7e and 7g that perform current differential calculation in the protection section. , 7f, 7h. Further, in the power transmission line protection devices A11, A12, B11, and B12, the terminal identification number setting devices 14e, 14g, 14f, and 14h from the outside set and store the identification numbers of the respective terminals. Further, the power transmission line protection devices A11, A12, B11, and B12 are connected to the general-purpose communication network I 5a or the general-purpose communication network I 5b via the general-purpose communication devices 3e, 3g, 3f, or 3h, and then the other general-purpose communication device 3e. It connects with another power transmission line protection apparatus via 3g, 3f, or 3h.

  The reason for duplicating the current differential calculation means is that if one communication network is stopped during operation maintenance or due to communication failure, etc., the other communication network can be used to perform current differential calculation, and the protection function of the power line protection device It is for maintaining.

  In FIG. 17, the correct connection state of the conventional power transmission line protection apparatus is shown. When transmission is performed using the power transmission line protection devices A1 and B1 and the transmission line protection devices A2 and B2, transmission is performed when the settings of the identification numbers I 8e and 8f, 8g and 8h, 11e and 11f, and 11g and 11h match. Is possible. That is, in the current differential calculation means I 6e and 6f between the power transmission line protection devices A1 and B1, transmission is performed when the settings of the identification numbers I 8e and 8f match in both devices.

  Next, FIG. 18 shows an erroneous setting state of the conventional power transmission line protection device. The identification number I 8e input by the current differential calculation means I 6e of the power transmission line protection device A1 is “transmission line protection device A1: (1), power transmission line protection device B1: (2)”, and the current differential calculation means II. The identification number I 11e input in 7e is set as “power transmission line protection device A1: (5), power transmission line protection device B1: (6)”. At this time, the identification number I 8f input by the current differential calculation means I 6f of the power transmission line protection device B1 is “power transmission line protection device A1: (1), power transmission line protection device B1: (2)”, and the current differential. The identification number I 11f input by the computing means II 7f is set as “power transmission line protection device A1: (7), power transmission line protection device B1: (8)”.

  In addition to the above setting, the identification number I 8g input by the current differential calculation means I 6g of the power transmission line protection device A2 is “power transmission line protection device A2: (3), power transmission line protection device B2: (4)”, and the current difference The identification number I 11g input by the dynamic calculation means II 7g is set as “power transmission line protection device A2: (7), power transmission line protection device B2: (8)”. Also, the identification number I 8h input by the current differential calculation means I 6h of the power transmission line protection device B2 is “power transmission line protection device A2: (3), power transmission line protection device B2: (4)”, and current differential calculation. The identification number I 11h input by means II 7h is set as “power transmission line protection device A2: (5), power transmission line protection device B2: (6)”.

  When such a setting is made, when the connection of the communication network is established, the current differential calculation means II, as indicated by the dotted line, between the power transmission line protection devices A1, B2 and the power transmission line set with the same identification number Data is transmitted between the protection devices A2 and B1. For this reason, even if the power transmission line protection devices A1, A2, B1, and B2 perform the comparison comparison of the identification numbers after that, the identification numbers I 8e, 8f, 8g, and 8h and the identification numbers II 11e, 11f, 11g, and 11h Since the setting is completely consistent between the local terminal and the counterpart terminal, it is determined that there is no abnormality in all terminals. Therefore, in the conventional erroneous connection detection method, there may be a situation where no abnormality is detected even if the transmission line protection devices A1, A2, B1, and B2 have a setting error. This situation can also occur in the case where the transmission path setting is virtually divided into series units.

JP 2006-320084 A

  Embodiments of the present invention provide a transmission line protection device and a transmission line protection system that can detect an erroneous setting and quickly find an abnormality and can improve the reliability of the transmission line protection device. With the goal.

  In order to achieve the above-described object, an embodiment of the present invention is installed at each terminal of a power system, and transmits / receives electric quantity data of each terminal for each transmission line to determine a current differential for determining an accident inside and outside a protection section. In a power transmission line protection device that performs computation, terminal identification number setting and storage means for setting and storing a plurality of identification numbers of each terminal including its own terminal and a counterpart terminal, and transmitting a plurality of identification numbers of each terminal Self-end information transmitting means for transmitting to the counterpart terminal via the path, counterpart end information receiving means for receiving a plurality of identification numbers of each terminal set in the counterpart terminal via the transmission path, and the received counterpart An identification number comparing means for comparing a plurality of identification numbers of terminals with a plurality of stored identification numbers of counterpart terminals, and a lock for locking the function of performing the current differential operation when the comparison results do not match Means And wherein the door.

  Another embodiment of the present invention includes a plurality of power line protection devices that are installed at each terminal of a power system, transmit and receive electrical quantity data of each terminal, and perform current differential calculation inside and outside the protection section, In the power transmission line protection system comprising a plurality of transmission lines that transmit and receive electrical quantity data between the power transmission line protection devices, the power transmission line protection device includes an identification number of each terminal including its own terminal and a counterpart terminal. Terminal identification number setting and storage means for setting and storing a plurality of terminals, self-end information transmitting means for transmitting a plurality of identification numbers of each terminal to the counterpart terminal via the transmission line, and set at the counterpart terminal A partner end information receiving means for receiving a plurality of identification numbers of each terminal via the transmission line, a plurality of identification numbers of the received partner terminals and a plurality of identification numbers of the stored partner terminals An identification number comparison means for comparison; If compare results do not match, characterized by comprising a lock means for locking the function of performing the current differential operation.

It is a lineblock diagram showing the power transmission line protection system concerning a 1st embodiment of the present invention. It is detail drawing which shows the structure of the power transmission line protection apparatus used by this embodiment. It is the schematic which shows the transmission format at the time of performing data transmission / reception between power transmission line protection apparatuses. It is a circuit block diagram which shows the operation | movement sequence of an identification number comparison means, (a) is an operation sequence of the identification number comparison means I, (b) is an operation sequence of the identification number comparison means II. It is detail drawing which shows the structure of the power transmission line protection apparatus used by 2nd Embodiment. It is the schematic which shows the transmission format at the time of performing data transmission / reception between power transmission line protection apparatuses. It is a circuit block diagram which shows the operation | movement sequence of an identification number comparison means, (a) is an operation sequence of the identification number comparison means I, (b) is an operation sequence of the identification number comparison means II. It is detail drawing which shows the structure of the power transmission line protection apparatus used by 3rd Embodiment. It is detail drawing which shows the structure of the power transmission line protection apparatus used in 4th Embodiment. It is the schematic which shows the transmission format at the time of performing data transmission / reception between power transmission line protection apparatuses. It is a circuit block diagram which shows the operation | movement sequence of an identification number comparison means, (a) is an operation sequence of the identification number comparison means I, (b) is an operation sequence of the identification number comparison means II. It is a circuit block diagram which shows the structure and operation | movement sequence of the power transmission line protection apparatus of 5th Embodiment. It is the schematic which shows the principle of the digital current differential relay system at the time of applying the conventional power transmission line protection apparatus to a parallel 2 line | wire 2 terminal power transmission line. It is the schematic which shows the state which connected the transmission lines 131 and 132 in FIG. 13 accidentally. It is the schematic explaining the conventional detection method regarding the misconnection of a power transmission line protection apparatus and a transmission line. It is a block diagram of the system which applied general purpose communication to the conventional power transmission line protection apparatus. It is the schematic which shows the correct connection state of the conventional power transmission line protection apparatus. It is the schematic which shows the state of the incorrect setting of the conventional power transmission line protection apparatus.

Embodiments of the present invention will be specifically described below with reference to the drawings.
[First Embodiment]
A first embodiment of the present invention will be described with reference to FIGS. In addition, here, a transmission line two-terminal configuration will be described as an example.

(overall structure)
FIG. 1 is a configuration diagram showing a power transmission line protection system according to the first embodiment of the present invention.

  In the transmission line protection system 10 of the present embodiment, transmission line protection devices A1 and A2 are provided on the A terminal side of the L1 transmission line 101 and the L2 transmission line 102, and are associated with the current transformers 111 and 112, respectively. It has been. Further, power transmission line protection devices B1 and B2 are provided on the B terminal side of the L1 transmission line 101 and the L2 transmission line 102, and are associated with the current transformers 113 and 114, respectively.

  The transmission line protection devices A1, A2, B1, and B2 are respectively current differential calculation means I 6a, 6c, 6b, and 6d and current differential calculation means II 7a, 7c, and 7b that perform current differential calculation in the protection section. , 7d. Further, in the power transmission line protection devices A1, A2, B1, and B2, the identification numbers of the respective terminals are set and stored by the respective terminal identification number setting devices 14a, 14c, 14b, and 14d from the outside. Further, the power transmission line protection devices A1, A2, B1, and B2 are connected to the general-purpose communication network I 4a or the general-purpose communication network I 4b via the general-purpose communication devices 3a, 3c, 3b, or 3d, and then the other general-purpose communication device 3a. It connects with another power transmission line protection apparatus via 3c, 3b, or 3d.

(Configuration of power transmission line protection device)
Next, the power transmission line protection device used in the present embodiment will be described in more detail with reference to FIG.

  The power transmission line protection device A1 includes a terminal identification number setting and storage unit 15a, a local end information transmission unit I 16a, a local end information transmission unit II 17a, a counterpart end information reception unit I 18a, a counterpart end information reception unit II 19a, and an identification number. Comparing means I 20a, identification number comparing means II 21a, current differential computing means I output lock 22a, current differential computing means II output lock 23a, alarm output I 24a, and alarm output II 25a are provided.

  The terminal identification number setting / storing means 15a uses the identification number setting device 14a from the outside such as a personal computer to identify the identification number of each terminal set for each of the current differential calculation means I 6a and the current differential calculation means II 7a. Each has a function of storing each current differential calculation means.

  Further, the self-end information transmitting means I 16a and the self-end information transmitting means II 17a digitally input the current values taken from the self-terminal identification numbers I 8a and 11a, the identification numbers II 9a and 12a and the current transformer 111 to the counterpart terminals. It has a function to convert and transmit.

  The other end information receiving means I 18a and the other end information receiving means II 19a are digitally converted from the counterpart terminal identification number I 8b, 11b, identification number II 9b, 12b, and the current value taken from the counterpart terminal current transformer 113. It has a function to receive data.

  Since the identification numbers I 8a, 8b, 11a, 11b and the identification numbers II 9a, 9b, 12a, 12b are set from the outside, arbitrary numbers and codes may be used. In the present embodiment, the identification numbers I 8a, 8b, 11a, 11b are arbitrary numbers or codes indicating the same protection target range (group), and the identification numbers II 9a, 9b, 12a, 12b are generally used for general-purpose communication. The IP (Internet Protocol) address to be used is used.

  The identification number comparison means I 20a and the identification number comparison means II 21a receive the received counterpart terminal identification numbers I 8b and 11b, the identification numbers II 9b and 12b, and the counterpart terminal identification numbers I 8a and 11a stored in the own terminal. The identification numbers II 9a and 12a are compared. Further, the current differential calculation means I output lock 22a and the current differential calculation means II output lock 23a have a current differential calculation means I 6a and a current differential calculation means II 7a when the comparison result of the identification numbers does not match. Lock each. Further, the alarm output I 24a and the alarm output II 25a output an alarm indicating a mismatch for each current differential calculation means.

  Similarly to the power transmission line protection device A1, the power transmission line protection device B1 has a terminal identification number setting and storage unit 15b, a local end information transmission unit I 16b, a local end information transmission unit II 17b, and a counterpart end information reception unit I 18b. , Counterpart information receiving means II 19b, identification number comparison means I 20b, identification number comparison means II 21b, current differential calculation means I output lock 22b, current differential calculation means II output lock 23b, alarm output I 24b, alarm output II 25b.

  FIG. 3 shows a transmission format when data transmission / reception is performed between the power transmission line protection device A1 and the power transmission line protection device B1. The transmission format is common to the current differential calculation means I 6a and 6b and the current differential calculation means II 7a and 7b, and includes a header part 26, a data part 27a, and a frame check part 28 for checking data. Has been. The transmission line protection device A1 and the transmission line protection device B1 include a transmission line protection device A1 electric quantity 55, a transmission line protection apparatus B1 electric quantity 56, an identification number I8a, 8b, 11a, 11b, an identification in the data portion 27a of the transmission format. Information of number II 9a, 9b, 12a, 12b is carried and transmission / reception is performed between the transmission line protection device A1 and the transmission line protection device B1.

(Function)
Next, the operation sequence of the identification number comparison unit I 20a and the identification number comparison unit II 21a will be described with reference to FIG. 4A is a circuit configuration diagram showing an operation sequence of the identification number comparison means I 20a, and FIG. 4B is a circuit configuration diagram showing an operation sequence of the identification number comparison means II 21a.

  4 (a) and 4 (b), 32a, 32b, 32c, and 32d are 2-input and 1-output AND gates that calculate the logical product of two signals received in positive logic, and calculate the result. Output in positive logic. Reference numerals 33a and 33b are NOT gates which receive a signal with positive logic and output a signal with negative logic.

  4A, the identification number comparison means I 20a first compares the identification number I between the transmission line protection device A1 and the transmission line protection device B1, and outputs an identification number I coincidence detection 29a if they match. . Also, the identification number II is compared between the transmission line protection device A1 and the transmission line protection device B1, and if they match, the identification number II coincidence detection 30a is output.

  Next, by the logical product 32a of the identification number I coincidence detection 29a and the identification number II coincidence detection 30a, the identification is performed only when both the identification number I and the identification number II coincide in the transmission line protection device A1 and the transmission line protection device B1. The number coincidence detection 34a is output. Furthermore, when both conditions of the condition 33a in which the identification number coincidence detection 34a is not detected and the condition in which the current differential calculation means I 6a is operated (logical product 32c), the current differential calculation means I The output lock 22a is output to stop the calculation, and at the same time, the alarm output I 24a is performed. Note that the alarm output I 24a performs screen display, alarm output to an external alarm, and the like, as in the past.

  Also in the identification number comparison means II 21a, as shown in FIG. 4B, when the identification number I is compared and matched between the transmission line protection device A1 and the transmission line protection device B1, the identification number I coincidence detection 29b. When the identification number II is compared between the power transmission line protection device A1 and the power transmission line protection device B1, the identification number II coincidence detection 30b is output. Next, by the logical product 32b of the identification number I coincidence detection 29b and the identification number II coincidence detection 30b, the identification is performed only when both the identification number I and the identification number II coincide in the transmission line protection device A1 and the transmission line protection device B1. The number coincidence detection 34b is output. Further, when both the condition 33b in which the identification number coincidence detection 34b is not detected and the condition in which the current differential calculation means II 7a is operating are satisfied (logical product 32d), the current differential calculation means II The output lock 23a is output to stop the calculation, and at the same time, the alarm output II 25a is performed.

(effect)
According to this embodiment, the identification number comparison means I 20a and the identification number comparison means II 21a are provided. For example, the identification numbers I 8a, 8b, 11a, 11b are arbitrary numbers for setting a protection group, and the identification numbers II 9a, 9b. , 12a, 12b can be combined as IP addresses generally used in general-purpose communication to prevent erroneous recognition of a device to be protected.

  Therefore, according to the present embodiment, by inputting and comparing a plurality of identification numbers in combination, it is possible to detect an erroneous setting and quickly find an abnormality, thereby improving the reliability of the power transmission line protection device. Can do.

[Second Embodiment]
(Configuration of power transmission line protection device)
FIG. 5 is a detailed diagram showing the configuration of the power transmission line protection device used in the second embodiment. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is simplified.

  The basic configuration of the second embodiment is the same as that of the first embodiment, but differs from the first embodiment in the following points. That is, in the first embodiment, an identification number (eg, IP address) arbitrarily assigned as the identification number II 9a, 12a of the power transmission line protection device A1 is used. However, in the present embodiment, in the power transmission line protection device A1, The identification numbers 35a and 35c assigned to the transmission hardware that performs transmission and reception are used as the identification numbers III 10a and 13a of the own terminals, respectively. Similarly to the power transmission line protection device A1, the power transmission line protection device B1 uses the identification numbers 35b and 35d assigned to the transmission hardware that performs transmission and reception as the identification numbers III 10b and 13b of its own terminal, respectively.

  FIG. 6 shows a transmission format when data transmission / reception is performed between the power transmission line protection device A1 and the power transmission line protection device B1 in the present embodiment. The basic configuration is the same as that of the first embodiment, but is different from the first embodiment in the following points. That is, the data portion 27b of the transmission format carries information of identification numbers III 10a, 10b, 13a, 13b instead of the identification numbers II 9a, 9b, 12a, 12b. Since the configuration other than the data portion 27b of the transmission format is the same as that of the first embodiment, description thereof is omitted.

  The transmission line protection device A1 and the transmission line protection device B1 include a transmission line protection device A1 electric quantity 55, a transmission line protection apparatus B1 electric quantity 56, an identification number I8a, 8b, 11a, 11b, and an identification in the data portion 27b of the transmission format. Information of number III 10a, 10b, 13a, 13b is carried and transmission / reception is performed between the transmission line protection device A1 and the transmission line protection device B1.

(Function)
Next, the operation sequence of the identification number comparison unit I 20c and the identification number comparison unit II 21c will be described with reference to FIG. 7A is a circuit configuration diagram showing an operation sequence of the identification number comparison means I 20c, and FIG. 7B is a circuit configuration diagram showing an operation sequence of the identification number comparison means II 21c.

  In FIGS. 7A and 7B, 32e, 32f, 32g, and 32h are 2-input and 1-output AND gates that calculate the logical product of two signals received in positive logic, and calculate the result. Output in positive logic. Reference numerals 33c and 33d are NOT gates that receive a signal with positive logic and output a signal with negative logic.

  In FIG. 7A, the identification number comparison means I 20c first compares the identification number I between the transmission line protection device A1 and the transmission line protection device B1, and outputs an identification number I coincidence detection 29a if they match. . Also, the identification number III is compared between the power transmission line protection device A1 and the power transmission line protection device B1, and if they match, the identification number III coincidence detection 31a is output.

  Next, by the logical product 32e of the identification number I coincidence detection 29a and the identification number III coincidence detection 31a, the identification is performed only when both the identification number I and the identification number III match in the transmission line protection device A1 and the transmission line protection device B1. The number coincidence detection 34c is output. Further, when both the condition 33c in which the identification number coincidence detection 34c is not detected and the condition in which the current differential calculation means I 6a is operating (logical product 32g), the current differential calculation means I The output lock 22a is output to stop the calculation, and at the same time, the alarm output I 24a is performed. Note that the alarm output I 24a performs screen display, alarm output to an external alarm, and the like, as in the past.

  Also, in the identification number comparison means II 21c, as shown in FIG. 7B, when the identification number I is compared and matched between the transmission line protection device A1 and the transmission line protection device B1, the identification number I coincidence detection 29b. When the identification number III is compared between the power transmission line protection device A1 and the power transmission line protection device B1, the identification number III coincidence detection 31b is output. Next, by the logical product 32f of the identification number I coincidence detection 29b and the identification number II coincidence detection 31b, the identification is performed only when both the identification number I and the identification number III match in the transmission line protection device A1 and the transmission line protection device B1. The number coincidence detection 34d is output. Further, when both the condition 33d in which the identification number coincidence detection 34d is not detected and the condition in which the current differential calculation means II 7a operates are satisfied (logical product 32h), the current differential calculation means II The output lock 23a is output to stop the calculation, and at the same time, the alarm output II 25a is performed.

(effect)
According to this embodiment, the identification number comparison means I 20c and the identification number comparison means III 21c are provided. For example, the identification numbers I 8a, 8b, 11a, 11b are arbitrary numbers for setting a protection group, and the identification numbers III 10a, 10b. , 13a, and 13b are combined as numbers assigned to transmission hardware that performs transmission and reception, thereby preventing erroneous recognition of a device to be protected.

  Therefore, according to the present embodiment, by inputting and comparing a plurality of identification numbers in combination, it is possible to detect an erroneous setting and quickly find an abnormality, thereby improving the reliability of the power transmission line protection device. Can do.

[Third Embodiment]
(Configuration of power transmission line protection device)
FIG. 8 is a detailed diagram showing the configuration of the power transmission line protection device used in the third embodiment. Note that the same components as those of the second embodiment are denoted by the same reference numerals, and description thereof is simplified.

  The basic configuration of the third embodiment is the same as that of the second embodiment, but differs from the second embodiment in the following points. That is, in the second embodiment, the identification numbers 35a and 35c assigned to the transmission hardware are used as the identification numbers III 10a and 13a of the power transmission line protection device A1, and these are set by the operator. In the embodiment, the identification numbers 35a and 35c are assigned as identification numbers III 10a and 13a by the unique identification number calling means 37a and the unique identification number calling means 38a, respectively, as current differential calculation means I 6a and current differential calculation means II 7a. Automatically set to and save.

  Similarly to the power transmission line protection device A1, the power transmission line protection device B1 identifies the identification numbers 35b and 35d assigned to each transmission hardware by the unique identification number calling means 37b and the unique identification number calling means 38b, respectively. The numbers III 10b and 13b are automatically set and stored in the current differential calculation means I 6b and the current differential calculation means II 7b, respectively.

  Other configurations and operations are the same as those of the second embodiment.

(effect)
According to the present embodiment, the same effect as the second embodiment can be obtained, and the identification number can be automatically set. Therefore, it is possible to prevent erroneous setting by the operator and to save labor of the operation setting. become.

[Fourth Embodiment]
(Configuration of power transmission line protection device)
FIG. 9 is a detailed diagram showing the configuration of the power transmission line protection device used in the fourth embodiment. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is simplified.

  The basic configuration of the fourth embodiment is the same as that of the first embodiment, but differs from the first embodiment in the following points. That is, in the first embodiment, the identification number I 8a, 11a and the identification number II 9a, 12a that can be arbitrarily set from the outside of the transmission line protection device are used in the transmission line protection device A1, but in this embodiment, In addition to these, identification numbers 35a and 35c assigned to each transmission hardware as identification numbers III 10a and 13a are used. Also, in the power transmission line protection device B1, as in the power transmission line protection device A1, the identification numbers 35b and 35d assigned to the transmission hardware as the identification numbers III 10b and 13b are used.

  FIG. 10 shows a transmission format when data transmission / reception is performed between the power transmission line protection device A1 and the power transmission line protection device B1 in the present embodiment. The basic configuration is the same as that of the first embodiment, but is different from the first embodiment in the following points. That is, the data portion 27c of the transmission format carries the information of the identification numbers III 10a, 10b, 13a, 13b in addition to the identification numbers I 8a, 8b, 11a, 11b and the identification numbers II 9a, 9b, 12a, 12b. Yes. Since the configuration other than the data portion 27c of the transmission format is the same as that of the first embodiment, description thereof is omitted.

  The transmission line protection device A1 and the transmission line protection device B1 include a transmission line protection device A1 electric quantity 55, a transmission line protection apparatus B1 electric quantity 56, an identification number I8a, 8b, 11a, 11b, an identification, in the data portion 27c of the transmission format. Information of number II 9a, 9b, 12a, 12b and identification number III 10a, 10b, 13a, 13b is carried and transmission / reception is performed between the transmission line protection device A1 and the transmission line protection device B1.

(Function)
Next, the operation sequence of the identification number comparison means I 20g and the identification number comparison means II 21g will be described with reference to FIG. 11A is a circuit configuration diagram showing an operation sequence of the identification number comparison means I 20g, and FIG. 11B is a circuit configuration diagram showing an operation sequence of the identification number comparison means II 21g.

  11 (a) and 11 (b), 32i and 32j are 3-input and 1-output AND gates that calculate the logical product of three signals received in positive logic and output the operation result in positive logic. To do. Reference numerals 32k and 32m are 2-input and 1-output AND gates that calculate the logical product of two signals received in positive logic and output the operation result in positive logic. Further, 33e and 33f are NOT gates that receive a signal with positive logic and output a signal with negative logic.

  In FIG. 11A, the identification number comparison means I 20g first compares the identification number I between the transmission line protection device A1 and the transmission line protection device B1, and outputs an identification number I coincidence detection 29a if they match. . Further, when the identification numbers II are compared and matched, an identification number II match detection 30a is output, and when the identification numbers III are compared and matched, an identification number IIi match detection 31a is output.

  Next, the identification number I, the identification number II, and the identification are identified in the transmission line protection device A1 and the transmission line protection device B1 by the logical product 32i of the identification number I match detection 29a, the identification number II match detection 30a, and the identification number III match detection 31a. Only when the three of the number III match, the identification number match detection 34e is output. Further, when both the condition 33e in which the identification number coincidence detection 34e is not detected and the condition in which the current differential calculation means I 6a is operating (logical product 32k) are satisfied, the current differential calculation means I The output lock 22a is output to stop the calculation, and at the same time, the alarm output I 24a is performed. Note that the alarm output I 24a performs screen display, alarm output to an external alarm, and the like, as in the past.

  Also in the identification number comparison means II 21g, as shown in FIG. 11B, when the identification number I is compared and matched between the transmission line protection device A1 and the transmission line protection device B1, the identification number I coincidence detection 29b. When the identification number II is compared and matched, the identification number II match detection 30b is output. When the identification number III is compared and matched, the identification number III match detection 31b is output. Next, the identification number I, the identification number II and the identification are identified by the logical product 32j of the identification number I coincidence detection 29b, the identification number II coincidence detection 30b, and the identification number III coincidence detection 31b. Only when the three of the number III match, the identification number match detection 34f is output. Furthermore, when both conditions of the condition 33f in which the identification number coincidence detection 34f is not detected and the condition in which the current differential calculation means II 7a is operating are satisfied (logical product 32m), the output of the current differential calculation means II is output. The lock 23a is output to stop the calculation, and at the same time, the alarm output II 25a is performed.

(effect)
According to the present embodiment, in addition to the same effects as those of the first embodiment, it is possible to more reliably detect an erroneous setting by the operator by increasing the number of items for confirming the mismatch of the identification numbers.

[Fifth Embodiment]
(Configuration of power transmission line protection device)
FIG. 12 is a circuit configuration diagram illustrating a configuration and an operation sequence of the power transmission line protection device of the fifth embodiment. In the first to fourth embodiments, when the identification numbers do not match, the current differential operation means is locked and the alarm output is performed for each current differential operation means by processing on the software of the power transmission line protection device. It was. However, this embodiment is different from the first to fourth embodiments in that the hardware portion is also locked.

  That is, as shown in FIG. 12, the power transmission line protection apparatus of the present embodiment performs processing in a total of six systems of system I to system III and system I ′ to system III ′, and the result is a circuit breaker control circuit (trip Circuit) 50. Among the systems, the system III includes an auxiliary relay LCXI 46a on the output side of the current differential calculation means I output lock 22a, and the system III ′ has an auxiliary on the output side of the current differential calculation means II output lock 23a. A relay LCXII 46b is provided.

  The circuit breaker control circuit 50 includes an LCXI contact 51a, an LCXII contact 51b, an MXI contact 52a, an MXII contact 52b, an FDXI contact 53a, and an FDXII contact 53b. Among these contacts, as shown in FIG. 12, the LCXI contact 51a and the LCXII contact 51b are normally closed, but the MXI contact 52a, the MXII contact 52b, the FDXI contact 53a, and the FDXII contact 53b are open.

  The auxiliary relay LCXI 46a and the auxiliary relay LCXII 46b are connected to the LCXI contact 51a and the LCXII contact 51b of the circuit breaker control circuit 50, respectively.

  Moreover, this power transmission line protection device has a main relay I 42a and an auxiliary relay MXI 43a connected to the main relay I 42a on the output side of the current differential calculation means I 6a in the system I. On the other hand, the system I 'also has a main relay II 42b and an auxiliary relay MXII 43b connected to the main relay II 42b on the output side of the current differential calculation means II 7a. The auxiliary relay MXI 43a and the auxiliary relay MXII 43b are connected to the MXI contact 52a and the MXII contact 52b of the circuit breaker control circuit 50, respectively.

  Furthermore, in the power transmission line protection device, in the system II, the auxiliary relay FDXI 45a is connected to the fail safe relay I 44a, and the auxiliary relay FDXI 45a is connected to the FDXI contact 53a of the circuit breaker control circuit 50. On the other hand, also in the system II ', the auxiliary relay FDXII 45b is connected to the fail safe relay II 44b, and the auxiliary relay FDXII 45b is connected to the FDXII contact 53b of the circuit breaker control circuit 50. The fail safe relay I 44a and the fail safe relay II 44b are provided to prevent malfunction of the main relay I 42a and the main relay II 42b, respectively.

(Function)
The operation sequence of the power transmission line protection apparatus of this embodiment will be described with reference to FIG.

  First, in FIG. 12, 32n, 32p, 32q, and 32r are 2-input and 1-output AND gates that calculate the logical product of two signals received in positive logic and output the operation result in positive logic. Is. 33g, 33h, 33i, and 33j are NOT gates that receive a signal with positive logic and output a signal with negative logic. Further, 40a and 40b are two-input and one-output OR gates that calculate the logical sum of two signals received in positive logic and output the calculation result in positive logic.

Next, an operation sequence will be described in accordance with system I to system III and system I ′ to system III ′.
(Strain I, I ')
First, in the system I, the operation output of the current differential calculation means I 6a drives the main relay I 42a and the auxiliary relay MXI 43a by the logical product 32q on the condition that the logical negation 33i of the current differential calculation I output lock 22a is a condition. . That is, when the current differential calculation means I 6a is operating and the identification number I matches and the output of the current differential calculation means I is not locked, the main relay I 42a and the auxiliary relay MXI 43a are driven, The MXI contact 52a of the circuit breaker control circuit 50 is closed.

  On the other hand, also in the system I ′, the operation output of the current differential calculation means II 7a is obtained by connecting the main relay II 42b and the auxiliary relay MXII 43b by the logical product 32r on the condition that the logical negation 33j of the current differential calculation II output lock 23a. Drive. That is, when the current differential calculation means I 7a is operating and the identification number II matches and the output of the current differential calculation means II is not locked, the main relay II 42b and the auxiliary relay MXII 43b are driven, The MXII contact 52b of the circuit breaker control circuit 50 is closed.

(Strain II, II ')
Further, in the system II, when the fail safe relay I 44a provided for preventing the malfunction of the main relay I 42a is operated, the auxiliary relay FDXI 45a is driven, and the auxiliary relay FDXI 45a is the FDXI contact of the circuit breaker control circuit 50. Close 53a. On the other hand, in the system II ′, when the fail safe relay II 44b provided for preventing the malfunction of the main relay II 42b is operated, the auxiliary relay FDXII 45b is driven, and the auxiliary relay FDXII 45b is connected to the circuit breaker control circuit 50. The FDXII contact 53b is closed.

(Strain III, III ')
Further, in the system III, both the conditions 33g where the identification number coincidence detection 34g is not detected (identification numbers do not coincide) and the current differential operation means I6a are operating are satisfied. Occasionally (logical product 32n), the current differential operation means I output lock 22a is output to stop the operation and perform the alarm output I 24a. Next, when either the condition under test 41a or the condition under which the current differential calculation means I output lock 22a is operated (logical sum 40a), the auxiliary relay LCXI 46a is driven to control the circuit breaker. The LCXI contact 51a of the circuit 50 is opened.

  Similarly, in the system III ′, both the condition 33h in which the identification number coincidence detection 34h is not detected (identification numbers do not coincide) and the condition in which the current differential calculation means II 7a is operating are both detected. When the condition is satisfied (logical product 32p), the current differential operation means II output lock 23a is output to stop the operation and the alarm output II 25a is performed. Next, when either the condition 41b under test or the condition under which the current differential operation means II output lock 23a is operated (logical sum 40b), the auxiliary relay LCXII 46b is driven to control the circuit breaker. Open the LCXII contact 51b of the circuit 50.

  As described above, in the systems I to III of the power transmission line protection device of the present embodiment, the auxiliary relay of the system III is subjected to the condition that the MXI contact 52a of the system I is closed and the condition that the FDXI contact 53a of the system II is closed. A condition for opening the LCXI contact 51a by driving the LCXI 46a is added.

  Therefore, in a state where the auxiliary relay LCXI 46a is not driven by the system III and the LCXI contact 51a is closed, the transmission line is operated under an AND condition where the MXI contact 52a of the system I is closed and the FDXI contact 53a of the system II is closed. The cutoff output 54 of the protective device is made.

  On the other hand, when the test is in progress or the identification numbers do not match, either the condition 41a under test or the condition under which the current differential operation means I output lock 22a is operating in the system III is selected. Is satisfied (logical sum 40a), the auxiliary relay LCXI 46a is driven, and the LCXI contact 51a of the circuit breaker control circuit 50 is opened. For this reason, even if the MXI contact 52a and the FDXI contact 53a are accidentally closed in the system I and the system II, the cutoff output 54 is not generated because the LCXI contact 51a of the system III is open.

  Further, also in the system I ′ to system III ′ of the power transmission line protection device of the present embodiment, the system III ′ assists under the condition that the MXII contact 52b of the system I ′ is closed and the condition where the FDXII contact 53b of the system II ′ is closed. Since the condition that the relay LCXII 46b is driven and the LCX contact II 51b is opened is added, as in the case of the system I to the system III, the MXII contact 52b Even if the FDXII contact 53b is closed, since the LCXII contact 51b of the system III ′ is open, the cutoff output 54 is not made.

(effect)
According to the present embodiment, it is possible to lock the current differential operation when detecting the mismatch of the identification numbers not only by software processing but also by hardware conditions of the auxiliary relay.

  Therefore, when a setting error occurs, the cutoff output is locked by hardware, so that the cutoff command output of the transmission line protection device can be locked more reliably, and the reliability of the transmission line protection device is improved. be able to.

  In this embodiment, since the auxiliary relay LCXI 46a is used in the system III and the auxiliary relay LCXI 46b is used in the system III ′, the cutoff output 54 can be locked by a simple method without adding a new hardware contact. can do.

[Other embodiments]
(1) In each of the above embodiments, an example in which two power transmission lines are used and each terminal has a two-terminal configuration has been described. However, the number of power transmission lines and the number of terminals may be any number. .

(2) In each of the above embodiments, the general-purpose communication network I 4a and the general-purpose communication network II 4b are used as the transmission lines, and the current differential calculation means I and the current differential calculation means corresponding to these two general-purpose communication networks, respectively. Although the example of the power transmission line protection device having II is shown, when the number of general-purpose communication networks is three or more, the power transmission line protection device having the number of current differential operation means corresponding to the number is used. You can also.

(3) In each of the embodiments described above, an example in which two or three identification numbers are used has been described. However, the number of identification numbers may be arbitrary.

(4) In the fourth embodiment (FIG. 9), the example in which the identification number III is manually set is shown. However, as in the third embodiment (FIG. 8), the unique identification number calling means 37a, 37b and It can also be set automatically using the unique identification number calling means 38a, 38b.

(5) In the fifth embodiment (FIG. 12), in the circuit breaker control circuit 50, a series of LCXI contact 51a, MXI contact 52a, FDXI contact 53a, a series of LCXII contact 51b, MXII contact 52b, and FDXII contact 53b. Two series are used, but only one of them may be used.

(6) Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

3a, 3c, 3b, 3d ... general-purpose communication devices 6a, 6b, 6c, 6d ... current differential calculation means I
7a, 7b, 7c, 7d ... current differential operation means II
8a, 8b ... identification number I
9a, 9b ... identification number II
10 ... Transmission line protection systems 11a, 11b ... Identification number I
12a, 12b ... identification number II
14a, 14c, 14b, 14d ... external terminal identification number setting devices 15a, 15b ... terminal identification number setting and storage means 16a, 16b ... own end information transmission means I
17a, 17b ... Own end information transmission means II
18a, 18b ... Counterpart information receiving means I
19a, 19b ... Counterpart information receiving means II
20a to 20h: Identification number comparison means I
21a to 21h: Identification number comparison means II
22a, 22b ... current differential calculation means I output lock 23a, 23b ... current differential calculation means II output lock 24a, 24b ... alarm output I
25a, 25b ... Alarm output II
26 ... Header portions 27a, 27b, 27c ... Data portion 28 ... Frame check portions 37a, 37b ... Unique identification number calling means 38a, 38b ... Unique identification number calling means 42a ... Main relay I
42b ... Main relay II
43a ... Auxiliary relay MXI
43b ... Auxiliary relay MXII
44a ... Fail-safe relay I
44b ... Fail Safe Relay II
45a ... Auxiliary relay FDXI
45b ... Auxiliary relay FDXII
46a ... Auxiliary relay LCXI
46b ... Auxiliary relay LCXII
50 ... Circuit breaker control circuit (trip circuit)
51a ... LCXI contact 51b ... LCXII contact 52a ... MXI contact 52b ... MXII contact 53a ... FDXI contact 53b ... FDXII
55 ... Electricity amount of transmission line protection device A1 56 ... Electricity amount of transmission line protection device B1 101, 102 ... Transmission lines 111, 112, 113, 114 ... Current transformer

Claims (7)

In the transmission line protection device that is installed at each terminal of the power system, performs electric current differential calculation for accident determination inside and outside the protection section by transmitting and receiving the electric quantity data of each terminal for each transmission path,
Terminal identification number setting and storage means for setting and storing a plurality of identification numbers of each terminal including its own terminal and the counterpart terminal,
Self-end information transmitting means for transmitting a plurality of identification numbers of each terminal to the counterpart terminal via the transmission line;
Partner terminal information receiving means for receiving a plurality of identification numbers of each terminal set in the partner terminal via the transmission line;
An identification number comparing means for comparing a plurality of identification numbers of the received counterpart terminals with a plurality of stored identification numbers of the counterpart terminals;
Lock means for locking the function of performing the current differential calculation when the comparison result does not match,
A power line protection device comprising:   The power transmission line protection apparatus according to claim 1, further comprising alarm output means for outputting an alarm when the comparison results do not match.   The power transmission line protection apparatus according to claim 1 or 2, wherein the processing by the identification number comparison unit, the processing by the locking unit, and the processing by the alarm output unit are performed for each transmission line.   The power transmission line protection device according to any one of claims 1 to 3, wherein an IP address or a number assigned to each device is used as the identification number.   The transmission line protection apparatus according to claim 4, further comprising means for automatically setting and storing a number assigned to each apparatus.   A circuit breaker control circuit is further provided on the output side of the locking means, and when a mismatch is detected for each transmission path, the circuit of the circuit breaker control circuit is disconnected for each transmission path, and a function of performing a current differential operation is provided. The power transmission line protection apparatus according to any one of claims 1 to 5, which is physically interrupted. A plurality of transmission line protection devices that are installed at each terminal of the power system, transmit and receive electrical quantity data of each terminal, and perform current differential calculation inside and outside the protection section, and the amount of electricity between the plurality of transmission line protection devices In a transmission line protection system comprising a plurality of transmission lines for transmitting and receiving data,
The power transmission line protection device is:
Terminal identification number setting and storage means for setting and storing a plurality of identification numbers of each terminal including its own terminal and the counterpart terminal,
Self-end information transmitting means for transmitting a plurality of identification numbers of each terminal to the counterpart terminal via the transmission line;
Partner terminal information receiving means for receiving a plurality of identification numbers of each terminal set in the partner terminal via the transmission line;
An identification number comparing means for comparing a plurality of identification numbers of the received counterpart terminals with a plurality of stored identification numbers of the counterpart terminals;
Lock means for locking the function of performing the current differential calculation when the comparison result does not match,
A transmission line protection system comprising:

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