CN111801865A - Digital protective relay device and method for operating digital protective relay device - Google Patents
Digital protective relay device and method for operating digital protective relay device Download PDFInfo
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- CN111801865A CN111801865A CN201880090668.6A CN201880090668A CN111801865A CN 111801865 A CN111801865 A CN 111801865A CN 201880090668 A CN201880090668 A CN 201880090668A CN 111801865 A CN111801865 A CN 111801865A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
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Abstract
A digital protective relay device comprising: an input circuit (11) which inputs an analog electric quantity and converts the analog electric quantity into a digital signal; an arithmetic processing unit (21) that executes various arithmetic processes using the converted digital signal; an output circuit (31) that generates and outputs an operation signal for operating the shutter based on the determination result of the arithmetic processing unit (21); a display unit (51) that displays the output of the arithmetic processing unit (21) in accordance with an input display item from the operation unit (811) or an external device, which is input from the input circuit (21); and a storage unit (23) for recording and storing the input display items and time from the operation unit (811) or the external device inputted to the input circuit (21), and comparing the display items and time set initially with the latest display items and time stored in the storage unit (23) when the display items of the display unit (51) change.
Description
Technical Field
The present invention relates to a digital protective relay device mounted on a distribution board or the like and an operation method thereof.
Background
The digital protective relay device is an apparatus as follows: an accident of a power system and a failure of a device to be protected in the power system (hereinafter, both are collectively referred to as "failure or the like") are detected, and a switch provided in a circuit breaker or the like is opened, thereby protecting the device to be protected.
In the digital protective relay device, a relay circuit is housed in a case and has an operation panel on a front surface. On the operation panel, a display signal such as a measured value and a signal indicating an abnormality are displayed, and a specific signal to be displayed, for example, a real-time measured value of current and voltage, is displayed by switching a switch or the like.
In a conventional digital protective relay device, when detecting a fault or the like in a power system, an open signal is output to a switch such as a circuit breaker in order to open and limit a section such as the fault, and information on a protection element to be operated and a corresponding phase is displayed on an operation display. At this time, when a failure or the like occurs or when maintenance inspection is performed, the maintenance/operator confirms the operation state through the operation display of the digital protective relay device.
However, when a power failure occurs due to a manual operation or the like other than a failure or the like, even if the digital protective relay device does not fail, it may be erroneously determined that the failure has occurred, and unnecessary cause finding, a confirmation test of soundness, or the like must be performed.
In view of the above problems, the applicant proposed the following digital protective relay devices: by providing the operation panel with a display unit that displays an operation during operation and an operation record recorded in the memory at the start of operation, even when a power failure occurs due to a manual operation other than a failure or the like, it is possible to distinguish and determine whether the operation display has been forgotten to be restored due to the power failure or whether the operation has been caused by the failure or the like (see patent document 1).
Further, a protective relay device is disclosed which stores a plurality of time-series data from the occurrence time of a failure or the like until a predetermined time elapses, and displays data at a specified time (see patent document 2).
Documents of the prior art
Patent document
Patent document 1: japanese patent application laid-open No. 2010-273515
Patent document 2: japanese patent laid-open publication No. 2011-
Disclosure of Invention
Technical problem to be solved by the invention
As described above, in the conventional digital protective relay device, a fault or the like and a power failure are triggered and recorded. Therefore, even if a failure or a power failure does not occur, it is difficult to confirm whether the state of the display unit or the alarm lamp has changed or the input/output contacts of the digital protective relay device itself have operated due to a human operation or due to an abnormal operation of the device, that is, the cause of the operation.
The present application discloses a technique for solving the above-described problems, and an object of the present application is to provide a digital protective relay device capable of confirming whether a change in display contents of a display unit of the digital protective relay device and a change in lighting state of a lamp (hereinafter referred to as a display change) are caused by a human operation or caused by an abnormal operation of the digital protective relay device itself.
Technical scheme for solving technical problem
A digital protective relay device disclosed in the present application is a digital protective relay device including an arithmetic processing unit that converts an input analog electric quantity into a digital signal and performs arithmetic processing using the digital signal, and includes: an output circuit that generates and outputs an operation signal for operating the circuit breaker based on the determination result of the arithmetic processing unit; a display unit that sets a display item using an input from an operation unit or an input from an external device, and displays an output from the arithmetic processing unit according to the set display item; and a lamp unit that shows an operation state of the lamp unit, wherein the arithmetic processing unit records a setting content and an input time of the display item after a predetermined time elapses under the set display item when the display item is set by an input from the operation unit or an input from the external device, and records an input from the operation unit or an input time from the external device when an operation signal of the circuit breaker is generated by an input from the operation unit or an input from the external device.
A method for operating a digital protective relay device according to the present application includes an arithmetic processing unit that converts an input analog electric quantity into a digital signal and performs arithmetic processing using the digital signal, an output circuit that generates and outputs an operation signal for operating a circuit breaker based on a determination result of the arithmetic processing unit, a display unit that sets a display item using an input from an operation unit or an input from an external device and displays an output from the arithmetic processing unit according to the set display item, and a lamp unit that shows an operation state of the digital protective relay device, the method comprising: setting the display item using an input from the operation section or an input from an external device, recording the setting content and the input time of the display item after a prescribed time passes under the set display item, recording a generation timing of the operation signal when the operation signal of the circuit breaker is generated by an input from the operation unit or an input from the external device, reading the recorded setting content and input time of the display item when the protected device of the digital protective relay device is not in failure and the display item set in the display unit is changed, and reading the recorded generation time of the action signal of the circuit breaker when the protected equipment of the digital protective relay device is not in fault and the lighting state of the lamp part is changed.
Effects of the invention
According to the digital protective relay device and the method for operating the digital protective relay device disclosed in the present application, since the input information and the input time set by the operation unit or the external device are recorded, it is possible to determine whether or not the display change of the digital protective relay device is caused by a human operation.
Drawings
Fig. 1 is a block diagram showing a schematic configuration of a digital protective relay device according to embodiment 1.
Fig. 2 is an external view showing an operation panel of the digital protective relay according to embodiment 1.
Fig. 3 is a flowchart showing a recording procedure of an input process of the operation unit of the digital protective relay according to embodiment 1.
Fig. 4 is a flowchart showing a recording procedure of an input process from an external device to the digital protective relay device according to embodiment 1.
Fig. 5 is a flowchart showing a procedure of recording input processing relating to the operation of the circuit breaker to the digital protective relay device according to embodiment 1.
Fig. 6 is a flowchart showing a procedure of recording a change of a display item in the digital protective relay device according to embodiment 2.
Fig. 7 is a flowchart showing a recording procedure when a signal of a contact output of the digital protective relay device according to embodiment 2 is generated.
Detailed Description
The present embodiment will be described below with reference to the drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals.
Fig. 1 is a block diagram showing a schematic configuration of a digital protective relay device 1 according to embodiment 1. Fig. 2 is an external view showing an operation panel 81 of the digital protective relay device 1.
In the figure, a digital protective relay device 1 includes: an input circuit 11, in which analog electric quantity such as current and voltage from a protected device is input to the input circuit 11 and converted into digital; an input circuit 12 for inputting a signal when the operation portion 811 of the operation panel 81 is operated and a signal from an external device, to the input circuit 12 through a contact point input; an arithmetic processing unit 21 for performing predetermined arithmetic processing on the digital signal converted by the input circuit 11; an output circuit 31, the output circuit 31 outputting an operation signal to the relay (Ry)41 by using the determination result of the arithmetic processing unit 21; a display unit 51 for displaying the state of the protected device on the basis of the output of the arithmetic processing unit 21 by the display unit 51; a lamp unit 61, wherein the lamp unit 61 displays the operating state of the digital protective relay device 1 according to the state of the protected device based on the output of the arithmetic processing unit 21; and a communication circuit 71, wherein the communication circuit 71 transmits and receives data between the arithmetic processing unit 21 and the external monitoring device 2.
The arithmetic Processing Unit 21 may include a CPU (Central Processing Unit) as an arithmetic Processing device. The arithmetic processing device may include various logic circuits such as an ASIC (Application Specific Integrated Circuit), an IC (Integrated Circuit), a DSP (Digital signal processor), various signal processing circuits, and the like. The storage device 23 is configured to exchange data with the arithmetic processing unit 21, and may include a RAM (Random Access Memory) configured to be able to Read and write data from the arithmetic processing unit 21, a ROM (Read Only Memory) configured to be able to Read data from the arithmetic processing unit 21, and the like. The storage device 23 includes at least a nonvolatile Memory (EEPROM) for storing information such as signals and state changes input from the input circuit 12 described later.
The arithmetic processing unit 21 performs various arithmetic processes using the digital signal from the input circuit 11, detects a failure or the like of a device to be protected (not shown), and determines whether or not to operate a circuit breaker or the like (operation determination). Further, a display signal for the display unit 51 and a lighting signal for the lamp unit 61 are generated and output from the signal input from the input circuit 12.
The output circuit 31 outputs an operation signal for operating the switch provided in the circuit breaker to the relay 41 based on the operation determination result of the arithmetic processing unit 21.
The external monitoring device 2 is constituted by a PC (personal computer) or the like, is connected to one or more digital protective relay devices 1, and appropriately receives information from the arithmetic processing unit 21 and monitors the operating state of the digital protective relay devices 1. The connection between the external monitoring device 2 and the digital protective relay device 1 may be either a cable or a wireless connection. A plurality of digital protective relay devices 1 may be connected to each other via a network.
Next, an example of the operation panel 81 will be described with reference to fig. 2. The operation panel includes, for example: a display unit 51, the display unit 51 being constituted by a liquid crystal screen; an operation unit 811, which is constituted by a switch, a knob, or the like, and which inputs selection of a display item, switching of setting contents, resetting of the digital protective relay device 1, and the like; and a lamp unit 61, which lights up the lamp unit 61 and shows the operating state of the circuit breaker of the digital protective relay device 1 (on/off of the circuit breaker) and the abnormality of the digital protective relay device 1 itself.
The display item indicates which item of the measured value and the set value displayed on the display unit 51 is displayed, and indicates, for example, a current value, a voltage value, and the like during measurement.
The lamp unit 61 generally includes a plurality of lamps, and displays the operating state of the digital protective relay device 1 itself including whether or not the operation signal of the circuit breaker is generated.
Although it may be provided on the lateral portion or the rear surface, for example, the device includes an input terminal 812 for inputting a contact from an external device such as a PLC and an output terminal 813 for outputting from the external monitoring apparatus 2.
The operation will be described by taking as an example a case where the digital protective relay device 1 is mounted on a distribution apparatus.
The operator confirms the display items displayed on the display unit 51 of the operation panel 81, the measurement values corresponding thereto, the lighting conditions of the lamp unit 61, and the like. When the display content of the display unit 51 is changed and another measurement item is confirmed, the switch of the operation unit 811 is continuously pressed until a desired display item is displayed. For example, when the current value at the predetermined position of the power distribution equipment displayed on the display unit 51 is changed in the order of the power amount and the power factor and confirmed, the switch of the operation unit 811 is continuously pressed and the content is confirmed until the predetermined display item appears. When measurement or monitoring of the power distribution equipment is started, input is performed through a switch and the operation is terminated so that confirmation of measurement contents and display of measurement items are appropriate.
When an input is made from an external device such as a PLC, the input information from the outside is changed, and the display content of the display unit 51 is set by a signal from the arithmetic processing unit 21 via the input terminal 812 and the input circuit 12.
When a fault or the like occurs in the power distribution equipment as the protected equipment and the circuit breaker becomes conductive, a predetermined lamp of the lamp unit 61 on which the circuit breaker is conductive is turned on. The operator checks the contents of the turned-on lamp and the display unit 51, and also, presses the switch of the operation unit 811 to check the contents of the display unit 51, thereby searching for the cause of the occurrence of the failure or the like. When a fault occurs, a history of a fault current, an elapsed time until the breaker operates, and the like is recorded in the storage device 23, and the cause of the fault current or the elapsed time can be confirmed by reading the information.
The above operation is performed based on the functions of the normal digital protective relay device 1.
Next, a procedure for determining whether or not the measurement display items set at the start of the measurement or the monitoring are changed in the display unit 51 by a human operation will be described.
Fig. 3 is a flowchart showing a recording procedure of an input process of the operation unit of the digital protective relay device 1 according to embodiment 1.
When the operator presses a switch of the operation unit 811, for example, a switch operation is input from the input circuit 12 (yes at step S11). The arithmetic processing unit 21 acquires the type and time of the display item input by the operation unit 811 (step S12).
In order to confirm the display content or check the setting operation, the switch is repeatedly pressed in a short time until the measurement or monitoring of the power distribution equipment is started. Therefore, if a predetermined time set in advance has elapsed in a state of a display item after the display item is set by the operation of the operation unit 811, it is considered that the measurement or the monitoring is started. In step S13, it is confirmed that the display item has not changed within a predetermined time. When the switch of operation unit 811 is pressed within a predetermined time period (no in step S13), the process returns to step S12, and the type and time of the newly input display item are acquired. When the predetermined time has elapsed without the display item being changed (yes at step S13), the arithmetic processing unit 21 records and stores the setting content and the input time of the display item that has not been changed in the storage device 23 (step S14).
When input information is recorded at the moment when the switch of the operation unit 811 is pressed, a large amount of information is stored in the storage device 23 at high speed when the switch rattles or when the switch is continuously pressed and released. To avoid this, it is preferable to record the input information after a predetermined time has elapsed.
The content recorded in the storage device 23 is, for example, a setting of which display item in the measurement is displayed by which switch at the time (input time).
The predetermined time during which the display items are not changed and the measurement or monitoring is regarded as being started depends on the protected equipment, the operator, and the like, and may be set to about several tens of seconds. As described above, in the confirmation of the display contents or the inspection setting operation, since the switch is repeatedly pressed in a short time, it is sufficient to confirm that the change does not occur in several tens of seconds. If the next operation unit 811 is operated to perform the output process within the set predetermined time, the recording may be performed with a new display item after the predetermined time has elapsed.
The setting of the display content after the lapse of the predetermined time may be recorded in the nonvolatile memory of the storage device 23. For example, if the storage capacity has a size of 20 times, the data is written sequentially, and the position of the 1 st time is overwritten at the 21 st time, but the latest information for starting the measurement or the monitoring or the information of the size several times from the latest may be stored.
Next, a description will be given of a recording procedure of an input process in a case where a display item is set by a contact input from an external device such as a PLC (Programmable Logic Controller). Fig. 4 is a flowchart showing a recording procedure of an input process from an external device to the digital protective relay device 1 according to embodiment 1.
An input from an external device is input by the input circuit 12 (yes at step S21). The arithmetic processing unit 21 acquires the type and time of the input display item (step S22). If a predetermined time set in advance has elapsed after the input of the display item, it is regarded that the measurement or monitoring is started, and it is confirmed that the predetermined time has elapsed without the display item being changed (yes at step S23). The arithmetic processing unit 21 records and stores the setting contents of the display items that have not changed and the input time in the storage device 23 (step S24).
When an input is made from the outside within a predetermined time, the input information and the input time may be repeatedly acquired in the same manner as the input from the operation unit 811 described above, and the latest information for starting measurement or monitoring or information of the size from the latest may be stored using a nonvolatile memory.
Next, the following will be described for the search of the cause in the case where: the display items of the display unit 51 are changed from the settings even if there is no failure of the power distribution equipment as the protected equipment.
When a failure or the like of the power distribution equipment occurs, the display unit 51 may display items other than the preset display items.
When the display item set at the start of measurement or monitoring is changed and there is no failure or the like of the power distribution equipment, the setting content of the latest display item stored in the storage device 23 and the input time (hereinafter, referred to as input setting information) thereof are read.
When the content and time of the set display item (hereinafter referred to as initial setting information) match the read content, it is determined that the digital protective relay device 1 is abnormal.
The initial setting information may be determined to be an artificial input when the content and time of the read input setting information are updated. That is, it is known that an input is made from the operation unit 811 or an input is made from an external device after the time when the initial measurement or monitoring is started. Further, when the input setting information stored in the storage device 23 is read sequentially from the latest input setting information and traced back to the time point at which the input setting information matches or is close to the initial setting information, the passage of the input can be grasped.
Next, a procedure will be described in which, when the lighting state of the lamp unit 61 changes even when there is no failure of the power distribution equipment as the protected equipment, or the like, it is determined whether or not the change is caused by a human operation.
Fig. 5 is a flowchart showing a procedure of recording input processing relating to the circuit breaker operation to the digital protective relay device 1 according to embodiment 1.
When the operator presses, for example, the forced breaker operation switch of the operation unit 811, the switch operation is input from the input circuit 12 (yes at step S31). The same is true in the case of input from an external device. The arithmetic processing unit 21 acquires the time input by the operation unit 811 and stores the time in the storage device 23 (step S32).
For example, when the distribution equipment and the digital protective relay 1 as the protected equipment are inspected, there is a possibility that the forcible breaker operation switch is input. However, the possibility of abnormality of the digital protective relay device 1 itself cannot be denied. Therefore, if an input record by a human operation is stored as shown in fig. 5, if the lighting state of the lamp unit 61 is changed even if there is no failure of the power distribution equipment as the protected equipment, it is possible to determine whether or not the input record is due to the human operation by checking the input record.
In addition to the input related to the operation of the circuit breaker, if there is an input to turn on the lamp unit 61, the input information and the time are recorded and stored according to fig. 5.
As described above, according to embodiment 1, the following digital protective relay device can be provided: since information of input from the operation unit 811 or input from an external device is recorded from the start of measurement or monitoring, and input information of lighting a lamp by the input from the operation unit 811 or the input from the external device is recorded, it can be confirmed whether a display change of the digital protective relay device is caused by a human operation or an abnormal operation of the device.
In the present embodiment, the following case is explained as an example: in addition to the recording of information input from the operation unit 811 or input from an external device in embodiment 1, information of output signals from the arithmetic processing unit 21 or the output circuit 31 is recorded and used.
A display signal to be output to the display unit 51 or a lighting signal to be output to the lamp unit 61 is generated in accordance with an instruction from the arithmetic processing unit 21. When the abnormality occurs, the input from the operation portion 811 or the input from the external device described in embodiment 1 is integrated with the display item displayed on the display portion 51. That is, the arithmetic processing unit 21 generates a signal of a display item of the corresponding display unit 51 by an input from the operation unit 811 or a contact input from an external device.
Therefore, it is sufficient to record the signal of the display item of the display unit 51 in the arithmetic processing unit 21, and compare the signal with the record of the input from the operation unit 811 or the contact input from the external device. The record generated by the signal of the display item of the display unit 51 in the arithmetic processing unit 21 corresponds to the record of the change of the display item of the display unit 51.
Fig. 6 is a flowchart showing a procedure of recording a change of a display item in the digital protective relay device 1 according to embodiment 2.
When the display item of the display unit 51 is changed, that is, when a new signal is generated for the display unit 51 by the arithmetic processing unit 21 (yes in step S41), information such as the time of change, the changed display item, and the display value is stored and recorded in the storage device 23 (step S42). The stored information corresponds to the signal related to the setting content of the display item generated by the arithmetic processing unit 21 and the output time thereof.
The recording may be saved, for example, as a 20-time recording using the nonvolatile memory of the storage device 23. Even if recording is performed every time a change is made, it is sufficient to save the recording from the start of measurement or monitoring. Further, if the record is left in synchronization with the time when the measurement or monitoring is determined to be started as described in embodiment 1, the number of times of writing to the memory can be reduced, and the load on the arithmetic processing unit 21 can be reduced.
Next, the following will be described for the search of the cause in the case where: the display items of the display unit 51 are changed from the settings even if there is no failure of the power distribution equipment as the protected equipment.
When a failure or the like of the power distribution equipment occurs, the display unit 51 may display items other than the preset display items.
When the initial setting information at the start of measurement or monitoring is changed without a failure of the power distribution equipment or the like in the display unit 51, the setting contents of the display items recorded in the storage device 23 and the input time (input setting information) thereof are read. The setting content of the display item and the output time (hereinafter, referred to as output setting information) recorded in the arithmetic processing unit 21 of the storage device 23 are read.
When the content and time (initial setting information) of the set display item match the read input setting content, it is determined that the digital protective relay device 1 is abnormal. At this time, the read input setting information is compared with the output setting information. When the read input setting information and output setting information are different setting information at the same time, for example, one of the reasons is that there is a problem in signal generation in the arithmetic processing unit 21. When a signal of output setting information different from the input setting information is generated after a lapse of time from the read input setting information, the cause of generation of the trigger signal is investigated.
In the case where the read input setting information is updated, the initial setting information may be determined to be an artificial input. That is, it is known that input is made from the operation unit 811 or contact input is made from an external device after the initial time to start measurement or monitoring.
At this time, the read input setting information is compared with the output setting information. When the read input setting information and the output setting information are the same setting information at the same time, it is verified that the arithmetic processing unit 21 generates a signal of a display item of the corresponding display unit 51 in accordance with an input from the operation unit 811 or an input from an external device.
The lighting signal output to the lamp unit 61 is also generated in accordance with the instruction of the arithmetic processing unit 21. Therefore, if there is an input from the operation unit 811 or an input from an external device to operate the circuit breaker, a predetermined lamp unit 61 is turned on based on a signal generated by an instruction from the arithmetic processing unit 21. Therefore, if the record of the generation of the output signal is stored, it is possible to confirm whether or not the correlation with the failure of the power distribution equipment or the like is present.
In fig. 6, the record of the change of the display item is referred to as the record of the change of the lighting state of the lamp unit, and the recording procedure of the lighting state of the lamp unit will be described.
In step S41, when the lighting state is changed, that is, when a new lighting signal for the lamp unit 61 is generated by the arithmetic processing unit 21 (yes in step S41), information such as the time of change, the type of the lamp after the change, and the lighting items is acquired and recorded and stored in the storage device 23 (step S42). In some cases, the lighting signal for the lamp unit 61 is based on the determination result by the arithmetic processing unit 21, and in this case, information of the determination result is also recorded and stored.
As in the case of the display signal for the display unit 51, the recording may be saved, for example, as 20 times as large as the recording using the nonvolatile memory of the storage device 23. Even if recording is performed every time a change is made, it is sufficient to save the recording from the start of measurement or monitoring. Further, if the record is left in synchronization with the time when the measurement or monitoring is determined to be started as described in embodiment 1, the number of times of writing to the memory can be reduced, and the load on the arithmetic processing unit 21 can be reduced.
Next, a procedure will be described in which, when the lighting state of the lamp unit 61 changes even when there is no failure of the power distribution equipment as the protected equipment, or the like, it is determined whether or not the change is caused by a human operation.
When a failure of the power distribution equipment or the like occurs, a predetermined lamp unit 61 is turned on by, for example, operating a circuit breaker.
Since the abnormality of the digital protective relay device 1 itself is indicated in the lamp unit 61, when there is no abnormality of the digital protective relay device 1 itself and there is no failure of the power distribution equipment, or the like, and the lighting state of the lamp unit 61 changes, the input information input to the lamp unit 61 recorded in the storage device 23 is read. Further, the signal output information for the lamp unit 61 generated by the arithmetic processing unit 21 recorded in the storage device 23 is read. If the input information and the output information for the lamp unit 61 match, it can be determined that the operation is caused by a human operation.
The output circuit 31 may output an operation signal to the relay 41 for operating the switch provided in the circuit breaker based on the operation determination result of the arithmetic processing unit 21, and may check whether or not the signal is related to a failure of the power distribution equipment if a record of the generation of the signal is stored.
Fig. 7 is a flowchart showing a recording procedure when the output circuit of the digital protective relay device 1 according to embodiment 2 generates a contact operation signal of the circuit breaker.
In the figure, when the output circuit 31 generates a contact signal for operating the shutter (yes in step S51), the determination result of the arithmetic processing unit 21 and information on the signal generation timing are acquired and recorded and stored in the storage device 23 (step S52). The stored time information corresponds to the operation time of the shutter.
Next, effective use of failure occurrence information in search of a cause of a case where a display item of the display unit 51 is changed from a setting even if there is no failure of a power distribution apparatus as a protected apparatus or the like will be described.
When there is no trouble or the like in the power distribution equipment since the display item set at the start of measurement or monitoring is changed, the setting content of the display item and the input time (input setting information) recorded in the storage device 23, the setting content of the display item and the output time (output setting information) of the display item generated by the arithmetic processing unit 21 recorded in the storage device 23, and the trouble occurrence information are read.
When the contents of the set display items are compared with the time (initial setting information), the read input setting information, and the output setting information, if the failure occurrence information is referred to, it can be confirmed that the failure of the power distribution equipment or the like has not occurred while the display items have changed.
In addition, the failure occurrence information can be effectively used in the search for the cause of a change in the lighting state of the lamp unit 61 even when there is no failure of the power distribution equipment as the protected equipment or the like.
As described above, according to embodiment 2, the same effects as those of embodiment 1 are obtained. In other words, it is possible to provide a digital protective relay device that can confirm whether a change in the display of the digital protective relay device is caused by a human operation or by an abnormal operation of the device.
In embodiments 1 and 2, the display signal for the display unit 51 and the lighting signal for the lamp unit 61 are generated by the arithmetic processing unit 21 using the signal input from the input circuit 12, and the operation signal for operating the switch provided in the circuit breaker based on the operation determination result of the arithmetic processing unit 21 is generated by the output circuit 31. All three of them may be generated by the arithmetic processing unit 21, or may be generated by the output circuit 31.
Although the switch input of the operation portion 811 of the operation panel 81 is exemplified in the above embodiments 1 and 2, the display portion 51 may be a touch panel type display portion and may be used as both the display portion and the operation portion.
In embodiments 1 and 2, the input setting information, the output setting information, and the like are recorded in the storage device 23 and appropriately read, but may be displayed on the display unit 51. When at least the latest input time of the input setting information is displayed, the operator can estimate what kind of input is present by checking the latest input time of the display unit 51.
In embodiments 1 and 2, an example in which the object to be protected by the digital protective relay device 1 is the distribution equipment has been described, but the present invention is not limited to this, and may be applied to protection and monitoring of a motor or the like.
Although the present disclosure describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to be applied to specific embodiments, and may be applied to embodiments alone or in various combinations.
Therefore, numerous modifications not illustrated are also contemplated as falling within the technical scope disclosed in the present specification. For example, the case where at least 1 component is modified, the case where at least 1 component is added, the case where at least 1 component is omitted, or the case where at least 1 component is extracted and combined with the components of other embodiments is included.
Description of the reference symbols
1: digital protective relay device, 2: monitoring devices, 11, 12: input circuit, 21: arithmetic processing unit, 23: storage device, 31: output circuit, 41: relay (Ry), 51: display unit, 61: lamp unit, 71: communication circuit, 81: operation panel, 811: operation unit, 812: input terminal, 813: and an output terminal.
Claims (5)
1. A digital protective relay device is provided,
the digital protective relay device includes an arithmetic processing unit that converts an input analog electric quantity into a digital signal and performs arithmetic processing using the digital signal, and includes:
an output circuit that generates and outputs an operation signal for operating the circuit breaker based on the determination result of the arithmetic processing unit;
a display unit that sets a display item using an input from an operation unit or an input from an external device, and displays an output from the arithmetic processing unit according to the set display item; and
a lamp part showing its own operation state,
the arithmetic processing unit:
when the display item is set by an input from the operation unit or an input from the external device, the setting content and the input time of the display item are recorded after a predetermined time has elapsed under the set display item,
when the operation signal of the circuit breaker is generated by using the input from the operation unit or the input from the external device, the input from the operation unit or the input timing from the external device is recorded.
2. The digital type protective relay according to claim 1,
the arithmetic processing unit records a change time and the display item after the change when generating a setting signal for the display item of the display unit and changing the display item of the display unit.
3. The digital type protective relay according to claim 1 or 2,
the operation processing unit records a change time and a changed lighting state when the lighting signal of the lamp unit is generated and the lighting state of the lamp unit is changed.
4. The digital type protective relay according to any one of claims 1 to 3,
the operation processing unit records a time when the circuit breaker is operated and an operation signal is generated by the output circuit according to a determination result, and the determination result.
5. An operation method of a digital protective relay device,
the digital protective relay device includes: an arithmetic processing unit that converts the input analog electric quantity into a digital signal and performs arithmetic processing using the digital signal; an output circuit that generates and outputs an operation signal for operating the circuit breaker based on the determination result of the arithmetic processing unit; a display unit that sets a display item using an input from an operation unit or an input from an external device, and displays an output from the arithmetic processing unit according to the set display item; and a lamp unit showing its own operation state, wherein the operation method of the digital protective relay device is characterized in that,
setting the display item by an input from the operation unit or an input from the external device, recording a setting content and an input time of the display item after a predetermined time elapses under the set display item,
when the operation signal of the circuit breaker is generated by the input from the operation unit or the input from the external device, the generation time of the operation signal is recorded,
reading the recorded setting content and input time of the display item when the protected device of the digital protective relay device is not in failure and the display item set in the display unit is changed,
and reading the recorded generation time of the action signal of the circuit breaker when the protected equipment of the digital protective relay device is not in fault and the lighting state of the lamp part is changed.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2018/009242 WO2019171583A1 (en) | 2018-03-09 | 2018-03-09 | Digital-type protection relay device and digital-type protection relay device operation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111801865A true CN111801865A (en) | 2020-10-20 |
| CN111801865B CN111801865B (en) | 2023-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880090668.6A Active CN111801865B (en) | 2018-03-09 | 2018-03-09 | Digital protective relay device and operation method thereof |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP7026772B2 (en) |
| KR (1) | KR102490435B1 (en) |
| CN (1) | CN111801865B (en) |
| TW (1) | TWI680620B (en) |
| WO (1) | WO2019171583A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022009250A1 (en) * | 2020-07-06 | 2022-01-13 | 三菱電機株式会社 | Protective relay |
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- 2018-03-09 KR KR1020207023729A patent/KR102490435B1/en active IP Right Grant
- 2018-03-09 JP JP2020504627A patent/JP7026772B2/en active Active
- 2018-03-09 WO PCT/JP2018/009242 patent/WO2019171583A1/en active Application Filing
- 2018-03-09 CN CN201880090668.6A patent/CN111801865B/en active Active
- 2018-05-18 TW TW107117056A patent/TWI680620B/en active
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Also Published As
| Publication number | Publication date |
|---|---|
| TW201939837A (en) | 2019-10-01 |
| WO2019171583A1 (en) | 2019-09-12 |
| TWI680620B (en) | 2019-12-21 |
| KR20200105943A (en) | 2020-09-09 |
| JPWO2019171583A1 (en) | 2020-10-22 |
| CN111801865B (en) | 2023-06-30 |
| KR102490435B1 (en) | 2023-01-19 |
| JP7026772B2 (en) | 2022-02-28 |
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