JP4738257B2 - Power system protection system - Google Patents

Description

  The present invention relates to a protection system in a power system of a double bus bustie system.

  As a double bus bus tie power system in a substation or the like, for example, a double bus 1 bus tie system in which one breaker is provided between the double buses is known (for example, see Non-Patent Document 1).

  In this double bus 1 bus tie system, for example, as shown in FIG. 5, a pair of busbar side disconnectors 53 and a busbar side disconnector 54 are interposed between the double buses of the busbar 51 and the Otsubus52. In addition to connecting the busbar breaker 55, a plurality of series circuits of a pair of busbar-side disconnectors and Otomobaru-side disconnectors are connected in parallel. A transmission line is connected to a connection point with the disconnector via a line-side disconnector and a line breaker. Also, the transformer is connected with a substantially similar configuration.

  In FIG. 5, between the double buses, the Koshiba side disconnector 56 and the Otomoline side disconnector 57, the Koshiba side disconnector 58 and the Otomoline side disconnector 59, the Koshiba side disconnector 60 and the Otoboline side disconnector 61, connecting four series circuits of the busbar side disconnector 62 and the Otobaline side disconnector 63 in parallel, and connecting the pair of disconnectors in each of these series circuits with 2 lines of 1 route 2 Route power transmission lines 64L1, 64L2, 65L1, 65L2 are connected via line-side disconnectors 66-69 and line breakers 70-73.

  Here, the busbar breaker 55 is connected to the bus current detected by the current transformer 74 provided between the A bus side disconnector 53 and the B bus side disconnector 54, or to the instrument transformer. Open / close control is performed by a bus connection protection relay 75 based on a bus voltage detected by a bus (not shown). Similarly, line breakers 70 to 73 are provided in corresponding power transmission lines. Open / close control is performed by the corresponding transmission line protection relays 80 to 83 based on the line current detected by the current transformers 76 to 79, the voltage of the power system detected by the instrument transformer (not shown), and the like. It has come to be. The transmission line protection relay prevents the accidents from expanding at the time of an electrical accident in each transmission line. Similarly, the transformer is controlled to open and close by a transformer protection relay to prevent the accident from being expanded during an electrical accident. Further, the bus contact protection relay is locked so as not to perform unnecessary opening / closing control under normal conditions.

  In the power system of the double bus 1 bus tie system shown in FIG. 5, normally, for example, the bus-side disconnectors 56 and 60 and the bus-side disconnectors 59 and 63 for connecting the transmission lines are closed (turned on), The other bus-line disconnectors 58 and 62 and the Otomo-line disconnectors 57 and 61 for connecting the power transmission lines are opened (turned off), and the power transmission lines 64L1 and 65L1 are connected via the bus-side disconnectors 56 and 60, respectively. The power transmission lines 64L2 and 65L2 are connected to the maiden bus line 52 via the maiden bus line side disconnectors 59 and 63, respectively. Note that the busbar disconnector 53, the busbar disconnector 54, and the busbar breaker 55 for busbar connection are all closed.

  In such a double bus 1 bus tie type power system, when a protection relay corresponding to one of a plurality of power transmission facilities connected to the bus is temporarily locked due to a failure or maintenance work, that is, protection Even if an overcurrent flows through the target power transmission facility or a voltage drop occurs, the protection relay is not energized and the corresponding circuit breaker cannot be opened. The corresponding power transmission equipment is replaced and protected by a breaker for bus contact and a bus contact protection relay.

  For example, in FIG. 5, when the protection relay 83 of the power transmission line 65L2 is in the locked state, the bus line side disconnector 58 is closed as shown in FIG. 6 from the state shown in FIG. The power transmission lines 64L1, 64L2 and 65L1 corresponding to all normal protection relays 80 to 82 are connected to the upper bus 51, and only the power transmission line 65L2 of the protection relay 83 in the locked state is connected to the second bus 52. . At the same time, the set value of the bus connection protection relay 75 is changed so that the protection relay 83 in the locked state can protect the power transmission line 65L2 that should be originally protected so that it can be used for alternative protection.

  On the other hand, analog relays have conventionally been used as protection relays used in power systems. However, in recent years, voltage and current to be protected are sampled at an appropriate period and digitally converted, and these are stored in advance. A digital relay is also employed that determines whether or not there is an accident in the protection target based on a comparison with a preset value that is arithmetically processed according to (see, for example, Non-Patent Document 1).

  In addition, as a power system protection system using a digital protection relay, the protection relay and an external terminal device are connected via communication means, and the power held in the protection relay by the operation of the operation means provided in the terminal device There is also known one that acquires a system state or changes a set value of a protection relay (see, for example, Patent Document 1).

  Furthermore, as an electric power system using digital protection relays, when an accident occurs, in order to eliminate the accident and prevent the accident from spreading, the knowledge of the protection relay system knowledge base as a knowledge base in advance In addition, the power system information that changes every moment of the power system is stored in the power system database, and the inference engine determines the relay operation based on the stored knowledge base and power system information. There is also known a protection relay system that infers whether or not is appropriate and changes the set value to an appropriate value (see, for example, Patent Document 2).

“Electrical Engineering Handbook”, 6th edition, The Institute of Electrical Engineers of Japan, February 20, 2001, p. 793-796, p. 1283-1286 JP 2003-348745 A JP 2001-186651 A

  However, as shown in FIG. 6, when the protection relay of the power transmission equipment in the locked state is replaced and protected by the bus contact protection relay, when the bus contact protection relay is an analog type relay, the bus contact is made each time. It is necessary to change the set value to a value according to the equipment to be protected at the installation location of the protection relay. For this reason, there is a problem that it is necessary for the worker to take a local response, and the setting value changing operation is troublesome and takes time. Further, even if it is a digital type relay, it is necessary to cope with the field even if it cannot be operated from an external terminal through a communication means.

  In addition, there are a wide variety of power transmission facilities connected to the bus, such as long-distance lines, short-distance lines, transformers, etc. In some cases, this is not possible due to the settling range and relay characteristics. As a countermeasure, for example, it is conceivable to install a short-distance and long-distance bus contact protection relay, and use them separately according to the protection target equipment that replaces them. Since a contact protection relay is required, there is a concern that the cost increases and the installation space increases. In addition, even if all of the alternative protection targets can be protected with a single analog bus contact protection relay, the set value must be changed for each protection target, which is very complicated. It was.

  On the other hand, when a digital relay is used as a bus contact protection relay, its settling range and relay characteristics are determined by software and data written in the memory, and the settling range can be widened compared to analog relays. Since it is easy to hold a plurality of characteristics, for example, if the technique disclosed in Patent Document 1 is adopted and a terminal device is connected to the bus contact protection relay via a communication means, there is no need for on-site handling by an operator. Therefore, it becomes possible to change the set value and the relay characteristic relatively easily to those most suitable for a transmission line, a transformer or the like to be protected.

  However, in this case, since the operator operates the operating means of the terminal device and inputs the settling value and the relay characteristics to be changed, the operator must replace the power transmission equipment to be protected before the change input operation. In addition to recognizing, it is necessary to recognize the set value and the relay characteristics. Moreover, since the settling value to be changed is directly input manually, there is a concern that an input error may occur.

  On the other hand, if the protection relay system disclosed in Patent Document 2 is adopted, the set value of the bus contact protection relay can be set appropriately. However, in this case, the protection relay system knowledge base that stores the knowledge base, the power system database that stores the power system information, and whether the settling value is valid based on the stored knowledge base and power system information. Therefore, there is a concern that the system configuration becomes complicated.

  Accordingly, an object of the present invention made in view of such circumstances is to provide a power system protection system that can easily and quickly and reliably change the setting when replacing the bus contact protection relay with a simple configuration. It is in.

The invention of the power system protection system according to claim 1, which achieves the above object, is connected to either one of the double busbars and a busbar breaker connected between the double busbars via a busbar side disconnector. As shown in the figure, a circuit breaker connected in series to each of a plurality of power transmission facilities and the like connected to each other via a bus-side disconnector, and a digital type for driving the busbar breaker A bus contact protection relay comprising a relay; a plurality of protection relays for driving the plurality of circuit breakers corresponding to the plurality of power transmission facilities; and the open / close states of the bus-side disconnectors and the disconnectors, has a remote monitor control device for monitoring the operating state of the power system including status and operation information of the protection relay, a control and monitoring device that is connected via communication means to the remote monitor control device, a
The control monitoring device includes an input operation unit, a display unit, and a determination unit that automatically determines a connection state of the power system including the double bus based on a monitoring result of an operation state by the remote monitoring control device, The determination means is provided with two AND circuits in each of the plurality of power transmission facilities, and the power transmission facilities obtained from the remote monitoring control device are connected to one input terminal of the AND circuit. Supply the open / close state signal of the corresponding pair of bus-side disconnectors, and open / close state of the line-side disconnector provided in the power transmission facility etc. obtained from the remote monitoring control device to the other input terminal of the AND circuit, respectively Supplying a signal, determining whether one power transmission facility or the like is connected to any one of the double buses, identifying the one power transmission facility or the like, and providing another AND circuit; AND times To supply the open / close state signal of a pair of bus-side disconnectors for bus connection obtained from the remote monitoring and control device to both of the input terminals, and both of the bus-side disconnectors are in a closed state. Configured to determine that the contact circuit breaker is ready for use;
When the relay characteristics and set values corresponding to the plurality of protection target power transmission facilities are stored in advance in the bus contact protection relay, and one of the plurality of protection relays is in a locked state in which the corresponding circuit breaker cannot be opened. In addition, the control monitoring device automatically sets the bus contact protection relay to the relay characteristic and the set value corresponding to the protection relay in the locked state via the communication unit based on the determination result by the determination unit. Or the operation of the input operation unit by the control monitoring device, the monitoring result of the operation state by the remote monitoring control device and the relay characteristics of the plurality of protection relays stored in the bus contact protection relay, and The set value is displayed on the display unit, and the relay characteristics and set value corresponding to the protection relay in the locked state are selected from the display information. And, manually by setting the busbar protection relay via said communication means to relay characteristic and setpoint that is above selected, by, be replaced protect the transmission facilities that address protection relay of the lock state It is characterized by.

According to the invention of claim 1, in the power system of the double bus bus tie system, there is a possibility that a digital relay is used as the bus bar communication protection relay, and the bus bar communication protection relay has an alternative protection connected to the double bus bar. The relay characteristics and set values of a plurality of protection relays corresponding to the power transmission equipment in advance are stored in advance, and when one of the plurality of protection relays is in a locked state, in the automatic mode, monitoring of the operation state by a remote monitoring control device is performed. Based on the result, the connection state of the power system is automatically determined by the control and monitoring device, and the relay characteristic and the set value of the bus contact protection relay are the relay characteristics corresponding to the lock state protection relay stored in advance and since the changed automatically set to an integer value, Runode can perform the alternative protection busbar protection relay more quickly and reliably, easy The configuration can be easily and quickly changed when replacing the bus contact protection relay with a simple configuration, and it is not necessary to input and set the relay characteristics and set values directly each time. can do.

Further, in the manual mode, the operation of the input operation unit of the control monitoring device is used to check the operating state of the power system displayed on the display unit of the control monitoring device, and the bus contact protection relay similarly displayed on the display unit From the relay characteristics and set values of each protection relay stored in advance, you can select the relay characteristics and set values corresponding to the protection relay in the locked state, and set the relay characteristics and set values of the bus contact protection relay. The setting change at the time of replacing the bus contact protection relay can be performed easily and quickly by manual operation, and it is not necessary to input and set the relay characteristics and set values directly each time. be able to.

  Hereinafter, an embodiment of a power system protection system according to the present invention will be described with reference to FIGS.

  FIG. 1 is a bus connection diagram in the present embodiment, FIG. 2 is a block diagram showing the configuration of the main part of the power system protection system, FIG. 3 is a flowchart for explaining the operation of the control monitoring apparatus shown in FIG. These are the circuit diagrams explaining the structure of the determination means in a control monitoring apparatus.

  This embodiment shows a power system protection system in a double bus 1 bus tie system similar to FIG. 5. As shown in FIG. 1, between the double buses of the first bus 1 and the second bus 2, A bus-connecting circuit breaker 5 is connected through a pair of busbar-side disconnectors 3 and Otomoline-side disconnectors 4, and a pair of busbar-side disconnectors 6, Otobus-side disconnectors 7, Four series circuits of the side disconnector 8 and the Otobo Line side disconnector 9, the Busbar side disconnector 10 and the Otomoline side disconnector 11, the Kobusen side disconnector 12 and the Otomoline side disconnector 13 are connected in parallel. In addition, two-route power transmission lines 14L1, 14L2, 15L1, and 15L2 made up of one route and two lines as power transmission facilities are connected in series to the connection point between the pair of disconnectors in each series circuit. 19 and line breakers 20-23 To have.

  The circuit breakers 20 to 23 are controlled to be opened by the corresponding protection relays 26 to 29 so as to prevent an accidental expansion at the time of an electrical accident in each power transmission line.

  In such a double bus 1 bus tie type power system, there is a possibility that all power transmission equipment connected to the double bus will be replaced and protected by the bus bar breaker 5 and the bus bar contact protection relay 25.

  FIG. 1 shows a connection state at the time of alternative protection when the protection relay 29 of the power transmission line 15L2 is in a locked state where the circuit breaker 23 cannot be controlled for opening. In this state, for example, the bus line side disconnectors 6, 8, and 10 are closed, and the bus line side disconnectors 7, 9, and 11 are opened, and the power transmission lines 14L1 corresponding to all normal protection relays 26 to 28 are opened. , 14L2 and 15L1 are connected to the first bus line 1, the first bus line side disconnector 12 is opened, the second bus line side disconnector 13 is closed, and only the transmission line 15L2 corresponding to the protection relay 29 in the locked state is the second bus line. 2 is connected. In addition, both the busbar side disconnector 3 and the Otsubaline side disconnector 4 are in a closed state, and the busbar connection protection relay 25 is set to the set value and relay characteristics of the protection relay 29 in the locked state, and is used for busbar connection. The breaker 5 and the busbar connection protection relay 25 provide alternative protection for the power transmission line 15L2.

  In the present embodiment, the bus contact protection relay 25 for controlling the opening of the busbar breaker 5 is a digital relay, and the protection relays 26 to 29 for controlling the opening of the line breakers 20 to 23 are respectively a digital relay or a relay. Use an analog relay.

  For this reason, an instrument current transformer 31 is provided between the bus-side disconnector 3 and the Otobus-side disconnector 4 to detect an inter-bus current, and an instrument transformer (see FIG. 1, only bus 32 of A1 is shown) and the voltage of the power system is detected, and the detected bus-to-bus current and bus voltage are supplied to the bus communication protection relay 25. The transmission lines 14L1, 14L2, 15L1, and 15L2 are provided with current transformers 33 to 36 to detect line currents, respectively, and the voltage of the power system is detected by the above-described instrument transformer. Line current and power system voltage are supplied to the corresponding protection relays 26-29. In addition, even when a transformer is connected as a power transmission facility via a bus-side disconnector, the opening / closing control is performed in the same manner, thereby preventing an accidental expansion at the time of an electrical accident of the transformer.

  Here, since the bus contact protection relay 25 is composed of a digital relay, as is well known from Non-Patent Document 1 and Patent Document 1 described above, an input conversion unit, an analog / digital conversion unit, an arithmetic processing unit. It has a digital input / output unit, a transmission unit, a settling display unit, a power supply unit, etc., and an arithmetic processing unit is stored in a ROM that stores programs, a RAM that stores data such as settling values, and a ROM. A CPU or the like is provided that performs a required calculation process according to a program stored therein, and performs operation determination such as accident detection based on a comparison between the calculation result and a set value stored in the RAM.

  In the present embodiment, as shown in FIG. 2, the relay characteristic data of all the protection relays 26 to 29 that may be protected by the bus contact protection relay 25 in the RAM 25 a that is a storage means of the bus contact protection relay 25. 26a-29a and settling value data 26b-29b are stored in advance corresponding to each protection relay, and this busbar connection protection relay 25 is connected to the remote monitoring control device 38 via the transmission unit 25b.

  The remote monitoring and control device 38 is configured to open and close the bus-side disconnectors 3, 6, 8, 10, and 12, the bus-side disconnectors 4, 7, 9, 11, and 13 and the line-side disconnectors 16 to 19, and busbar communication. The remote monitoring control device 38 is connected to the control monitoring device 40 via the communication means 39. The remote monitoring control device 38 monitors the operating state of the power system including the operation information of the protection relay 25 and the protection relays 26 to 29.

  The control monitoring device 40 is installed, for example, in a remote centralized control station. Here, the connection of the electric power system is based on the monitoring result of the operation state by the input operation unit 40a, the display unit 40b, and the remote monitoring control device 38, which is a keyboard. A determination means 40c for automatically determining the state is provided, and a mode setting switch 40d for setting the relay characteristic and the set value of the bus contact protection relay 25 in the automatic mode or the manual mode is provided. The mode setting switch may be switched by software.

  Hereinafter, the setting operation of the relay characteristic and the set value of the bus contact protection relay 25 by the control monitoring device 40 will be described with reference to the flowchart shown in FIG.

  First, whether the mode is the automatic mode or the manual mode is detected from the state of the mode setting switch 40d (step S1). If the manual mode is set, the operation state by the remote monitoring control device 38 is operated by the operation of the input operation unit 40a. And the relay characteristics and set values of each protection relay stored in the bus contact protection relay 25 are displayed on the display unit 40b via the communication means 39, and the display information corresponds to the protection relay 29 in the locked state. The relay characteristic and the set value are selected by operating a key or the like (step S2).

  Thereafter, (step S3) When the usage control is performed (in the case of Yes), the operator sends a command to change to the relay characteristic and the set value selected in step S2 (step S4). For example, data capable of identifying the relay characteristic and set value of the protection relay selected by key operation is sent out, and the bus contact protection relay 25 is set and changed to the relay characteristic and set value corresponding to the protection relay 29 in the locked state.

  In addition, when a setting change is unnecessary in step S3 (in the case of No), or after sending the change command in step S4, the process returns to step S1.

  On the other hand, when the automatic mode is set in step S1, only one power transmission line (protection target) is connected to the one-side bus by the determination means 40c based on the monitoring result of the operation state by the remote monitoring control device 38. It is determined whether or not the power transmission is performed, and the single power transmission line is identified (step S5). That is, in the case of FIG. 1, one power transmission line 15L2 connected to the second bus 2 is identified.

  For this reason, the determination means 40c is provided with two AND circuits 41a and 41b corresponding to each power transmission line, as shown in FIG. 4A, and one input terminal of each of these AND circuits 41a and 41b. Are supplied with the open / close state signals AS and BS of the pair of busbar side disconnectors and the Otsubaline side disconnector corresponding to the transmission line obtained from the remote monitoring and control device 38, and the other inputs of the AND circuits 41a and 41b, respectively. An open / close state signal LS of a line-side disconnector provided in the power transmission line obtained from the remote monitoring control device 38 is supplied to the terminal.

  Here, the open / close state signals AS, BS, and LS are assumed to be high (H) level when the corresponding disconnector is in the closed state, and low (L) level when the corresponding disconnector is in the open state. When the output is at the H level, the power transmission line is connected to the bus A 1, and when the output of the AND circuit 41 b is at the H level, the power transmission line is connected to the second bus 2.

  In this way, the outputs of the two AND circuits 41a and 41b corresponding to each power transmission line are monitored to determine whether only one power transmission line is connected to the one-side bus, and to the one transmission line. Identify the wires.

  In step S5, when only one power transmission line is connected to the one-side bus and the one power transmission line can be identified, next, based on the monitoring result of the operation state by the remote monitoring control device 38, in the determination means 40c, It is determined whether or not both of the pair of busbar side disconnectors 3 and the Otobus side disconnector 4 that are for busbar connection are closed (step S6).

  For this reason, as shown in FIG. 4B, the determination means 40c is provided with one AND circuit 42 and a pair of buses for connecting the buses obtained from the remote monitoring control device 38 at its two input terminals. The open / close state signals AS3 and BS4 of the side disconnector 3 and the Otsuba side disconnector 4 are supplied.

  Here, the open / close state signals AS3 and BS4 are respectively high (H) level when the corresponding busbar side disconnector 3 and Otobaline side disconnector 4 are in the closed state, and low (L) level when they are in the open state. When the output of the AND circuit 42 is at the H level, both the bus-side disconnector 3 and the Otobus-side disconnector 4 are closed, and the busbar breaker 5 can be used. It is determined that

  If it is determined in step S6 that the busbar contact breaker 5 is in a usable state (in the case of Yes), then the busbar communication protection corresponding to the power transmission line 15L2 that is one protection target identified in step S5. Data that can identify the relay characteristic and the set value of the relay 25 is automatically selected (step S7).

  Thereafter, in step S3, when the use control of the bus contact protection relay 25 is performed, as in the case of manual control, data that can identify the relay characteristic and the set value of the selected protection relay is transmitted to protect the bus contact protection. The setting of the relay 25 is changed to the relay characteristic and set value corresponding to the protection relay 29 in the locked state.

  In step S5, when only one power transmission line is not connected to the one-side bus (in the case of No), in step S6, both the bus-side disconnector 3 and the Otsu-bus-side disconnector 4 are used. When is not in the closed state (in the case of No), the process returns to step S1.

  As described above, according to the present embodiment, in the manual mode, the operation state of the power system obtained from the remote monitoring control device 38 is displayed on the control monitoring device 40 by the operation of the input operation unit 40a of the control monitoring device 40. From the relay characteristics and set values of the respective protection relays stored in advance in the RAM 25a of the busbar connection protection relay 25 displayed on the display unit 40b while confirming the operating state of the displayed power system. By selecting the relay characteristic and the set value corresponding to the protection relay in the locked state, the relay characteristic and the set value of the bus contact protection relay 25 can be set and changed. The setting can be changed easily and quickly by manual operation, and the relay characteristics and set values can be directly input and set each time. Since there is no necessity, it is possible to reliably performed without causing input errors.

  Further, in the automatic mode, the connection state of the power system is automatically determined by the determination means 40c of the control monitoring device 40 based on the monitoring result of the operation state by the remote monitoring control device 38, and the relay of the bus contact protection relay 25 is determined. Since the characteristic and set value are automatically changed to the relay characteristic and set value corresponding to the protection relay in the locked state stored in advance, the alternative protection by the bus contact protection relay 25 can be performed more quickly and easily with a simple configuration. It can be executed reliably.

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, in the above-described embodiment, the relay characteristics and set values of all the protection relays that may be alternatively protected are stored in the RAM 25a that is a built-in memory of the bus contact protection relay 25 that is a digital relay. Depending on the capacity of the RAM 25a, an additional memory may be provided inside or outside the busbar connection protection relay 25 to store the relay characteristics and set values of all the protection relays that may be protected by substitution. The relay relay relay characteristic data may be stored in the ROM as part of the program.

  Further, when the setting of the bus contact protection relay 25 is changed, the control and monitoring device 40 is in a locked state without displaying the operation state of the power system and the relay characteristics and set values of each protection relay stored in the bus contact protection relay 25. It is also possible to change the setting of the bus contact protection relay 25 to the relay characteristic and the set value corresponding to the lock protection relay stored in advance only by operating the key or the like corresponding to the protection relay.

  Further, the present invention is not limited to the power system of the double bus 1 bus tie system described above, but other connection systems such as a double bus 11/2 circuit breaker system, a double bus 2 bus tie system, The present invention can also be applied to a bus 4 bus style. When a plurality of bus contact protection relays are provided, a plurality of protection relays corresponding to a plurality of power transmission facilities that may be protected by each bus contact protection relay may be allocated.

It is a bus-line connection diagram which shows one Embodiment of the electric power system protection system in this invention. It is a block diagram which shows the structure of the principal part of the electric power system protection system by this Embodiment. It is a flowchart for demonstrating operation | movement of the control monitoring apparatus shown in FIG. It is a circuit diagram explaining the structure of the determination means in the control monitoring apparatus shown in FIG. It is a bus-line connection diagram which shows the electric power system of a double bus-line 1 bustie system. It is a bus-line connection figure at the time of alternative protection in the electric power system shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bus line 2 Oto bus line 3, 6, 8, 10, 12 Bus line side disconnector 4, 7, 9, 11, 13 Otobus side disconnector 5 Bus line breaker 14L1, 14L2, 15L1, 15L2 Transmission line 16 -19 Line side disconnector 20-23 Line breaker 25 Bus line connection protection relay 25a RAM
25b Transmission unit 26-29 Protection relay 26a-29a Relay characteristic data 26b-29b Setting value data 31, 33-36 Current transformer 32 Instrument transformer 38 Remote monitoring control device 39 Communication means 40 Control monitoring device 40a Input operation Unit 40b display unit 40c determination means 40d mode setting switch 41a, 41b, 42 AND circuit

Claims (1)

A busbar breaker connected between the double busbars via a busbar-side disconnector;
A circuit breaker connected in series to each of a plurality of power transmission facilities and the like that may have alternative protection connected via a bus-side disconnector, so as to be connected to one of the double buses,
A bus contact protection relay comprising a digital relay that drives the bus contact breaker;
A plurality of protective relays for driving the plurality of circuit breakers corresponding to the plurality of power transmission facilities, and the like;
A remote monitoring and control device for monitoring the operating state of the power system including the open / close state of each of the bus-side disconnectors and the disconnectors, and the state / operation information of the protection relays,
And a control monitoring device connected through a communication means to the remote monitor control device,
The control monitoring device includes an input operation unit, a display unit, and a determination unit that automatically determines a connection state of the power system including the double bus based on a monitoring result of an operation state by the remote monitoring control device, Have
The determination means includes two AND circuits in each of the plurality of power transmission facilities and the like, and a pair of AND circuits corresponding to the power transmission facilities and the like obtained from the remote monitoring control device is provided at one input terminal of each AND circuit. Supply the open / close state signal of the bus-side disconnector, and supply the open / close state signal of the line-side disconnector provided in the power transmission equipment obtained from the remote monitoring control device to the other input terminal of the AND circuit. Determining whether one power transmission facility or the like is connected to one of the double buses, identifying the one power transmission facility or the like, and providing another AND circuit. Supply the open / close state signal of a pair of bus-side disconnectors, which are for busbar communication obtained from the remote monitoring control device, to the two input terminals, and both the busbar-side disconnectors are in a closed state, and the busbar communication Circuit breaker Is configured to determine that the usable state,
Pre-store relay characteristics and settling values corresponding to the plurality of protection target power transmission facilities etc. in the bus contact protection relay,
When one of the plurality of protection relays is in a locked state where the corresponding circuit breaker cannot be opened,
The control monitoring device automatically sets the bus contact protection relay to the relay characteristic and the set value corresponding to the protection relay in the locked state via the communication unit based on the determination result by the determination unit. Or
The control monitoring device operates the input operation unit, and displays the monitoring results of the operating state by the remote monitoring control device and the relay characteristics and set values of the plurality of protection relays stored in the busbar connection protection relay. Display on the display unit, select the relay characteristic and set value corresponding to the locked protection relay from the display information, and set the communication means to the selected relay characteristic and set value for the bus contact protection relay By manually setting through
A power system protection system, wherein the power transmission equipment corresponding to the protection relay in the locked state is protected by substitution.

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