Monitoring and control system and abnormality detection device

Abstract

To provide a monitoring control system and an abnormality detection device, capable of identifying a location of occurrence of a failure in a system including a power apparatus and a controller.SOLUTION: An abnormality detection device comprises a receiving unit, a second input contact, and an abnormality determination unit. The receiving unit receives a monitoring signal from the controller. The controller has a first input contact and a first output contact and makes a drive signal be output from the first output contact when a predetermined trigger is generated. The monitoring signal is a signal showing whether or not the drive signal is input to the first input contact when the trigger is generated. The second contact is connected between the controller and the power apparatus. The abnormality determination unit determines a location of occurrence of abnormality on the basis of the monitoring signal and a signal input to the second input contact.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] An embodiment of the present invention relates to a monitoring control system and an abnormality detection device. [Background technology]

[0002] The power equipment in a substation is provided with switches such as circuit breakers and disconnectors that open and close power circuits. The power equipment is provided with a monitoring and control system for controlling the power equipment. The monitoring and control system determines whether the switch is operating normally by monitoring whether the switch has operated within a predetermined time after the control device outputs a signal to operate the switch. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-148413 A Summary of the Invention [Problem to be solved by the invention]

[0004] When it is detected that a switch does not operate, the monitoring and control system is required to determine where the fault is located in the system including the power equipment and the control device. An object of the present invention is to provide a monitoring and control system and an abnormality detection device that can identify the location of a fault in a system including electric power equipment and a control device. [Means for solving the problem]

[0005] A monitoring and control system according to an embodiment is a monitoring and control system for controlling an electric power device having a switch and a coil for exciting the switch. The monitoring and control system includes a control device and an abnormality detection device. The control device controls the switch. The abnormality detection device monitors the electric power device and the control device. The control device includes a first input contact, a first output contact, an output control unit, and a transmission unit. The first output contact is connected to the coil. The output control unit outputs a drive signal for driving the coil from the first output contact when a predetermined trigger occurs. The transmission unit transmits a monitoring signal indicating whether or not a drive signal has been input to the first input contact when the trigger occurs to the abnormality detection device. The abnormality detection device includes a receiving unit, a second input contact, and an abnormality determination unit. The receiving unit receives the monitoring signal. The second input contact is connected between the control device and the electric power device. The abnormality determination unit determines that an abnormality has occurred in the control device when the monitoring signal indicates that a drive signal is not input to the first input contact when the trigger occurs. The abnormality determination unit determines that an abnormality has occurred between the power equipment or the control device and the power equipment when the monitoring signal indicates that a drive signal is input to the first input contact when a trigger occurs and no drive signal is input to the second input contact. [Brief description of the drawings]

[0006] [Figure 1] 1 is a schematic diagram showing a configuration of a monitoring and control system according to a first embodiment. [Diagram 2] 4 is a flowchart showing the operation of the measurement apparatus according to the first embodiment. [Diagram 3] FIG. 11 is a schematic diagram showing the configuration of a monitoring and control system according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] Hereinafter, a monitoring and control system and an abnormality detection device according to an embodiment will be described with reference to the drawings. (First embodiment) FIG. 1 is a schematic diagram showing the configuration of a monitoring and control system 1 according to the first embodiment. The monitoring and control system 1 according to the first embodiment controls a circuit breaker 2, which is a main device, and monitors for the presence or absence of a fault. The monitoring and control system 1 includes a control device 13, a protection device 15, and a measurement device 17, which are provided in the same housing 11.

[0008] The circuit breaker 2 includes a contact pair 21 and a trip coil 22. The contact pair 21 and the trip coil 22 form a relay circuit. The trip coil 22 is connected to the monitoring and control system 1 via a first conductor 31. The contact pair 21 is a pair of a movable contact and a fixed contact. The contact pair 21 opens (goes OFF) when the excitation of the trip coil 22 is turned ON. The contact pair 21 closes (goes ON) when the excitation of a closing coil (not shown) is turned ON. The closing coil is also connected to the monitoring and control system 1 in the same manner as the trip coil 22. A second conductor 32 connected to the monitoring and control system 1 is connected to the secondary side of the contact pair 21. A current flows through the second conductor 32 when the contact pair 21 is closed. The circuit breaker 2 is provided separately from the monitoring and control system 1. For example, the monitoring and control system 1 and the circuit breaker 2 are provided about 30 meters apart. In the following embodiment, the monitoring and control system 1 will be described as monitoring the control of the trip coil 22, but the monitoring and control system 1 may monitor the control of the close coil in a similar manner.

[0009] The control device 13 receives operations from an operator and controls the contact pair 21 to stop or switch power transmission. The control device 13 according to the first embodiment includes a PLC 130 (Programmable Logic Controller) and a machine interface unit 142. The machine interface unit 142 is a relay circuit. The machine interface unit 142 is connected to the contact pair 21 of the circuit breaker 2 via a first conductor 31. The control device 13 receives control signals (trip control signal and close control signal) related to opening and closing of the circuit breaker 2 from a PC 141 or a central monitoring device (not shown) connected via a communication line 19.

[0010] The PLC 130 includes a DO contact 131, a first DI contact 132, a second DI contact 133, a transmission port 134, and an MPU 135 (Micro Processing Unit). The DO contact 131 is connected to a machine interface unit 142. That is, when an OFF signal for putting the contact pair 21 in an OFF state is input to the DO contact 131, the machine interface unit 142 applies a voltage to the first conductor 31. The first DI contact 132 is connected to the DO contact 131. This allows the PLC 130 to monitor the operation of the DO contact 131 based on the input of the first DI contact 132. The second DI contact 133 is connected to the secondary side of the contact pair 21 of the circuit breaker 2 via the second conductor 32. That is, the PLC 130 can recognize the state of the circuit breaker 2 based on the input of the second DI contact 133. The transmission port 134 is connected to the PC 141 and the measuring device 17 via a communication line 19 such as Ethernet (registered trademark). The transmission port 134 is an example of a transmission unit. That is, an operation signal from an operator is input to the PLC 130 via the transmission port 134 .

[0011] The MPU 135 outputs an OFF signal from the DO contact 131 when a trip control signal is input via the transmission port 134. The trip control signal is transmitted by the PC 141 or a central monitoring device (not shown). The input of the trip control signal via the transmission port 134, i.e., the acceptance of an operation by an operator, is an example of a trigger for outputting an OFF signal from the DO contact 131. The MPU 135 is an example of an output control unit. In addition, the MPU 135 judges whether or not an OFF signal is input to the first DI contact 132 immediately after the trip control signal is input via the transmission port 134. For example, the MPU 135 judges whether or not an OFF signal is detected from the first DI contact 132 in the next control cycle after the trip control signal is detected. The MPU 135 transmits a monitoring signal indicating whether or not an OFF signal is input to the first DI contact 132 immediately after the trip control signal is input to the measuring device 17 via the transmission port 134. The monitoring signal is transmitted to the measuring device 17 in, for example, a data packet format. In addition, the MPU 135 monitors the open / closed state of the contact pair 21 based on a signal input to the second DI contact 133 .

[0012] The protection device 15 detects an accident signal such as a ground fault in the system and controls the breaker 2. The protection device 15 is configured, for example, by a digital relay circuit. The protection device 15 according to the first embodiment includes a ground fault detection circuit 151, a trip switch 152, a DO contact 153, a DI contact 154, a transmission port 155, and an MPU 156. The trip switch 152 is configured, for example, by a relay circuit. The ground fault detection circuit 151 is configured, for example, by a zero-phase current transformer (ZCT). The trip switch 152 is connected to the contact pair 21 of the breaker 2 via the first conductor 31. The DO contact 153 is connected to the trip switch 152. That is, when an OFF signal is input to the DO contact 153, the trip switch 152 applies a voltage to the first conductor 31. The DI contact 154 is connected to the DO contact 153. This allows the protection device 15 to monitor the operation of the DO contact 153 based on the input of the DI contact 154. The transmission port 155 is connected to the measuring device 17 via a communication line 19 .

[0013] The MPU 156 outputs an OFF signal from the DO contact 153 when the ground fault detection circuit 151 detects an accident signal. The detection of the accident signal is an example of a trigger for outputting an OFF signal from the DO contact 153. The MPU 156 determines whether or not an OFF signal is input to the DI contact 154 immediately after the ground fault detection circuit 151 detects the accident signal. The MPU 156 transmits a monitoring signal indicating whether or not an OFF signal is input to the DI contact 154 immediately after the detection of the own signal to the measuring device 17 via the transmission port 155. The monitoring signal is transmitted to the measuring device 17 in, for example, a data packet format.

[0014] The measuring device 17 includes a first DI contact 171, a second DI contact 172, a third DI contact 173, a transmission port 174, and an MPU 175. The first DI contact 171 is connected to an output end of the machine interface unit 142. The second DI contact 172 is connected to an input end of the trip coil 22 of the circuit breaker 2. The third DI contact 173 is connected to the second conductor 32. The transmission port 174 receives monitoring signals from the control device 13 and the protection device 15. The transmission port 174 is an example of a receiving unit. The MPU 175 determines whether or not there is an abnormality based on the input signals of the DI contacts and the monitoring signals received by the transmission port 174, and identifies the location of the abnormality if there is an abnormality. The MPU 175 displays the determination result of whether or not there is an abnormality and the identification result of the location of the abnormality on the PC 141 or the like. The measuring device 17 is an example of an abnormality detection device. The MPU 175 is an example of an abnormality determination unit.

[0015] FIG. 2 is a flowchart showing the operation of the measuring device 17 according to the first embodiment. When the measuring device 17 according to the first embodiment receives a monitor signal via the transmission port 174, it executes the process shown in FIG.

[0016] The MPU 175 identifies the device that is the source of the monitoring signal received via the transmission port 174 (step S1). The monitoring signal is transmitted by the control device 13 or the protection device 15. The MPU 175 determines whether the monitoring signal received via the transmission port 174 indicates that an OFF signal is input to the first DI contact 132 when a predetermined trigger occurs (step S2). If the monitoring signal indicates that an OFF signal is not input to the first DI contact 132 when a predetermined trigger occurs (step S2: NO), the MPU 175 determines that an abnormality exists in the output circuit of the device identified in step S1 (step S3). This is because the control device 13 or the protection device 15 does not output a predetermined DO signal even though a trigger that should open the contact pair 21 occurs in the control device 13 or the protection device 15.

[0017] When the monitoring signal indicates that an OFF signal has been input to the first DI contact 132 when a predetermined trigger occurs (step S2: YES), the MPU 175 judges whether or not an OFF signal has been input to the first DI contact 171 (step S4). That is, the MPU 175 judges whether or not a predetermined voltage is applied from the output terminal of the control device 13 or the protection device 15. When the MPU 175 judges that an OFF signal has not been input to the first DI contact 171 (step S4: NO), the MPU 175 judges whether or not an OFF signal has been input to the third DI contact 173 (step S5). That is, the MPU 175 judges whether or not the contact pair 21 has been turned OFF by the operation of the trip coil 22.

[0018] When an OFF signal is input to the third DI contact 173 (step S5: YES), the MPU 175 determines that the circuit breaker 2 and the control device 13 are operating normally, but that there is an abnormality in the DI contact of the measurement device 17 (step S6). This is to indicate that some signals cannot be detected in the measurement device 17 even though the circuit breaker 2 is operating normally, that is, the output of the control device 13 or the protection device 15 is being transmitted correctly to the circuit breaker 2 and is operating.

[0019] On the other hand, if an ON signal is input to the third DI contact 173 (step S5: NO), the MPU 175 determines that there is an abnormality in the output terminal of the device identified in step S1 (step S7). This is because no signal is being output from the output terminal even though an OFF signal is being output from the DO terminal of the control device 13.

[0020] If an OFF signal is input to the first DI contact 171 (step S4: YES), the MPU 175 determines whether or not an OFF signal is input to the second DI contact 172 (step S8). That is, the MPU 175 determines whether or not a predetermined voltage is applied to the input terminal of the trip coil 22. If the MPU 175 determines that an OFF signal is not input to the first DI contact 171 (step S8: NO), it determines whether or not an OFF signal is input to the third DI contact 173 (step S9). That is, the MPU 175 determines whether or not the contact pair 21 has been turned OFF by the operation of the trip coil 22.

[0021] If an OFF signal is input to the third DI contact 173 (step S9: YES), the MPU 175 determines that the circuit breaker 2 and the control device 13 are operating normally, but that there is an abnormality in the DI contact of the measurement device 17 (step S10).

[0022] On the other hand, when an ON signal is input to the third DI contact 173 (step S9: NO), the MPU 175 determines that there is an abnormality in the first conducting wire 31 (step S11). This is because, although a voltage is applied from the output terminal of the control device 13, the voltage does not reach the input terminal of the trip coil 22, and a break in the first conducting wire 31 is suspected.

[0023] If an OFF signal is input to the second DI contact 172 (step S8: YES), the MPU 175 determines whether or not an OFF signal is input to the third DI contact 173 (step S12). If an OFF signal is input to the third DI contact 173 (step S12: YES), the MPU 175 determines that the circuit breaker 2 and the control device 13 are operating normally (step S13). On the other hand, if an OFF signal is input to the third DI contact 173 (step S12: NO), the MPU 175 determines that an abnormality has occurred in the circuit breaker 2 (step S14).

[0024] The MPU 175 transmits data of a display screen indicating the presence or absence of an abnormality in the control of the circuit breaker 2 to the PC 141 via the communication line 19, and causes the display unit 176 to display the display screen (step S15). If an abnormality is present in the control of the circuit breaker 2, the display screen includes the location of the abnormality identified by the MPU 175.

[0025] Thus, according to the first embodiment, the measuring device 17 determines that an abnormality has occurred in the control device (control device 13 or protective device 15) when the monitoring signal received from the control device indicates that an OFF signal is not input to the input contact when a trigger occurs. Also, the measuring device 17 determines that an abnormality has occurred in the circuit breaker 2 or between the circuit breaker 2 and the protective device 15 when the monitoring signal indicates that an OFF signal is input to the input contact when a trigger occurs and a predetermined voltage is not detected between the control device and the circuit breaker 2. This allows the measuring device 17 to identify the location of a fault in a system including the circuit breaker 2 and the control device.

[0026] Furthermore, according to the first embodiment, when a signal is output from the output end of the control device 13 but no signal is input to the input end of the trip coil 22, the measuring device 17 determines that a fault has occurred in the first conductor 31 connecting the control device 13 and the trip coil 22. Since the control device 13 and the trip coil 22 may be provided apart from each other, an event in which the breaker 2 does not operate due to a disconnection of the first conductor 31 may easily occur. Therefore, as in the first embodiment, the measuring device 17 distinguishes and indicates whether the fault is in the control device 13 or the trip coil 22, or in the first conductor 31, thereby enabling the operator to quickly take action against the fault.

[0027] Here, as a comparative example, the operation of the measuring device 17 in the case where there is no communication of a monitoring signal through the communication line 19 will be described. In the case where there is no communication of a monitoring signal, the measuring device 17 can determine whether or not the circuit breaker 2 has been operated under the control of the control device 13 by determining whether or not the third DI contact 173 indicates ON after an OFF signal is input to the first DI contact 171. However, if an OFF signal is not output in spite of the occurrence of a trigger in the first place in the control device 13, the measuring device 17 cannot detect the occurrence of the trigger, and may not be able to perform an abnormality determination. Even if an abnormal operation is detected, it is difficult for the measuring device 17 according to the comparative example to determine which part of the output terminal of the control device 13, the first conductor 31, and the circuit breaker 2 has a fault. In contrast, the measuring device 17 according to the first embodiment can reliably recognize the trigger in the control device 13 and further identify the location of the fault.

[0028] Second embodiment 3 is a schematic diagram showing the configuration of a monitoring and control system 1 according to the second embodiment. The monitoring and control system 1 according to the second embodiment differs from the first embodiment in the input of a signal to a measuring device 17 and the operation of the measuring device 17. A disturbance signal such as a surge voltage may enter the circuit breaker 2. The monitoring and control system 1 according to the second embodiment further determines whether or not an abnormality due to a disturbance signal has occurred in the circuit breaker 2, in addition to detecting a malfunction between the control device and the circuit breaker 2.

[0029] The measuring device 17 according to the second embodiment includes a first AI contact 177 and a second AI contact 178 in addition to or instead of the second DI contact 172 and the third DI contact 173. The AI ​​contact is a contact that accepts an input of an analog signal and includes an AD conversion unit therein. That is, a signal input to the AI ​​contact is converted into a digital signal that represents the strength of the signal. The first AI contact 177 is connected to the input end of the trip coil 22 of the circuit breaker 2. The second AI contact 178 is connected to the second conductor 32.

[0030] MPU 175 determines that an OFF signal has been input when the voltage input to the AI ​​contact is equal to or greater than a predetermined threshold, and determines that an OFF signal has been input when the voltage is less than the predetermined threshold. This enables MPU 175 to perform the determination process of FIG. 2 based on the inputs to first AI contact 177 and second AI contact 178.

[0031] 2, that is, regardless of whether a monitor signal is received or not, MPU 175 monitors input signals of first AI contact 177 and second AI contact 178. MPU 175 is an example of a signal determination unit. The MPU 175 judges whether the input signal of the AI ​​contact is a square wave. For example, the MPU 175 judges that the input signal is a square wave when the difference between the voltage of the input signal and the voltage of the ON signal (e.g., 100 V) during a certain period, or the difference between the voltage of the input signal and the voltage of the OFF signal (e.g., 0 V) ​​is within a predetermined error range. When the input signals of the first AI contact 177 and the second AI contact 178 are square waves, the MPU 175 judges that no abnormality such as a surge voltage has occurred, that is, the circuit breaker 2 is operating according to a normal signal based on the control by the control device 13 or the protection device 15. On the other hand, when the input signal of at least one of the first AI contact 177 and the second AI contact 178 is not a square wave, the MPU 175 judges that an abnormality due to a disturbance signal such as a surge voltage has occurred in the circuit breaker 2. The MPU 175 causes the PC 141 to output information indicating that an abnormality due to a disturbance signal has occurred.

[0032] In this way, the monitoring and control system 1 of the second embodiment can further determine whether or not an abnormality has occurred in the circuit breaker 2 due to a disturbance signal, in addition to detecting a malfunction between the control device 13 or the protection device 15 and the circuit breaker 2.

[0033] According to at least one of the embodiments described above, the abnormality detection device has a receiving unit that receives a monitoring signal from the control device and an input contact connected between the control device and the electric power equipment, and can determine the location of the abnormality based on the monitoring signal and the signal input to the input contact.

[0034] Although the monitoring and control system 1 according to the embodiment described above includes the control device 13 and the protection device 15 as control devices for controlling the circuit breaker 2, in other embodiments, the monitoring and control system 1 may include only one of the control device 13 and the protection device 15. Moreover, the monitoring and control system 1 according to other embodiments may further include another control device.

[0035] Moreover, the monitoring and control system 1 according to the embodiment described above monitors the operation of the circuit breaker 2, but is not limited to this. For example, the monitoring and control system 1 according to another embodiment may monitor another switch such as a disconnector.

[0036] Furthermore, in order to detect a signal passing through the first conductor 31, the monitoring and control system 1 according to the above-described embodiment acquires signals from both the output side of the control device 13 and the input side of the trip coil 22, but is not limited to this. For example, the monitoring and control system 1 according to other embodiments may detect only a signal from either the output side of the control device 13 or the input side of the trip coil 22, or may detect a signal from the first conductor 31.

[0037] Furthermore, the monitoring and control system 1 according to the second embodiment inputs the input signal of the trip coil 22 of the circuit breaker 2 and the output signal of the contact pair 21 to the AI ​​terminal, but is not limited to this. For example, the monitoring and control system 1 according to another embodiment may input only one of the input signal of the trip coil 22 of the circuit breaker 2 and the output signal of the contact pair 21 to the AI ​​terminal. In this case, the other signal may be input to the DI terminal.

[0038] The MPU provided in the control device 13, the protection device 15, and the measurement device 17 is a computer equipped with a processor, a memory, an auxiliary storage device, and the like. The program executed by the MPU may be recorded on a computer-readable recording medium. The computer-readable recording medium is, for example, a storage device such as a magnetic disk, a magneto-optical disk, an optical disk, or a semiconductor memory. The program may be transmitted via a telecommunication line. All or part of the functions of the MPU may be realized using a custom LSI (Large Scale Integrated Circuit) such as an ASIC (Application Specific Integrated Circuit) or a PLD (Programmable Logic Device). Examples of PLDs include PAL (Programmable Array Logic), GAL (Generic Array Logic), CPLD (Complex Programmable Logic Device), and FPGA (Field Programmable Gate Array). Such integrated circuits are also included in the scope of the processor.

[0039] Although some embodiments of the present invention have been described, 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, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope of the invention and its equivalents described in the claims, as well as in the scope and spirit of the invention. [Explanation of symbols]

[0040] 1...Monitoring and control system 11...Housing 13...Control device 130...PLC 131...DO contact 132...1st DI contact 133...2nd DI contact 134...Transmission port 135...MPU 141...PC 142...Machine interface unit 15...Protection device 151...Earth fault detection circuit 152...Trip switch 153...DO contact 154...DI contact 155...Transmission port 156...MPU 17...Measuring device 171...1st DI contact 172...2nd DI contact 173...3rd DI contact 174...Transmission port 175...MPU 177...1st AI contact 178...2nd AI contact 19...Communication line 2...Main engine 21...Circuit breaker 22...Trip coil 31...1st conductor 32...2nd conductor

Claims

1. A monitoring and control system for controlling an electric power device including a switch and a coil for exciting the switch, A control device for controlling the switch; an abnormality detection device that detects abnormalities in the electric power equipment and the control device; Equipped with The control device includes: A first input contact; a first output contact connected to the coil; an output control unit that outputs a drive signal indicating that the coil is to be driven from the first output contact when a predetermined trigger occurs; a transmission unit that transmits a monitor signal indicating whether or not a drive signal has been input to the first input contact when the trigger occurs to the abnormality detection device; Equipped with The abnormality detection device includes: a receiving unit for receiving the supervisory signal; A second input contact connected between the control device and the power device; an abnormality determination unit that determines that an abnormality has occurred in the control device when the monitoring signal indicates that a drive signal is not input to the first input contact when the trigger occurs, and that determines that an abnormality has occurred in the electric power device or between the control device and the electric power device when the monitoring signal indicates that a drive signal is input to the first input contact when the trigger occurs and that a drive signal is not input to the second input contact; A monitoring and control system comprising:

2. the abnormality detection device includes a third input contact connected to an output end of the control device; the second input contact is connected to an input end of the coil; The abnormality determination unit When a drive signal is not input to the third input contact, it is determined that an abnormality exists in the output terminal of the control device; When a drive signal is input to the third input contact and a drive signal is not input to the second input contact, it is determined that an abnormality exists in a conductor connecting the control device and the electric power device. The monitoring and control system according to claim 1 .

3. The abnormality detection device includes: an AD conversion unit that performs AD conversion on a signal input to the second input contact; a signal determination unit that determines whether or not the signal is a normal signal based on control by the control device based on the intensity of the AD converted signal; The monitoring and control system according to claim 1 or 2, comprising:

4. An abnormality detection device that monitors a monitoring and control system that controls an electric power device including a switch and a coil that excites the switch, a receiving unit that receives, from a control device that outputs a drive signal indicating that the coil is to be driven from the first output contact when a predetermined trigger is generated, a monitoring signal indicating whether or not a drive signal has been input to the first input contact when the trigger is generated; and A second input contact connected between the control device and the power device; an abnormality determination unit that determines that an abnormality has occurred in the control device when the monitoring signal indicates that a drive signal is not input to the first input contact when the trigger occurs, and that determines that an abnormality has occurred in the electric power device or between the control device and the electric power device when the monitoring signal indicates that a drive signal is input to the first input contact when the trigger occurs and that a drive signal is not input to the second input contact; An abnormality detection device comprising:

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