CN111801865B - Digital protective relay device and operation method thereof - Google Patents
Digital protective relay device and operation method thereof Download PDFInfo
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- CN111801865B CN111801865B CN201880090668.6A CN201880090668A CN111801865B CN 111801865 B CN111801865 B CN 111801865B CN 201880090668 A CN201880090668 A CN 201880090668A CN 111801865 B CN111801865 B CN 111801865B
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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
Abstract
A digital protective relay apparatus comprising: an input circuit (11) that inputs an analog electric quantity and converts the analog electric quantity into a digital signal; an arithmetic processing unit (21) that performs various arithmetic processing using the converted digital signal; an output circuit (31) which generates and outputs an operation signal for operating the shutter based on the determination result of the operation processing unit (21); a display unit (51) for displaying the output of the operation processing unit (21) in response to an input display item from the operation unit (811) or an external device input from the input circuit (21); and a storage unit (23) for recording and storing the input display item and time input to the input circuit (21) from the operation unit (811) or the external device, and for comparing the display item and time initially set with the latest display item and time stored in the storage unit (23) when the display item of the display unit (51) is changed.
Description
Technical Field
The present invention relates to a digital protective relay device mounted on a switchboard or the like and an operation method thereof.
Background
The digital protective relay is an apparatus of the following type: an accident in the power system and a failure of the protected equipment in the power system (hereinafter, both are collectively referred to as "failure or the like") are detected, and a shutter provided in a circuit breaker or the like is opened to protect the protected equipment.
In a digital protective relay device, a relay circuit is housed in a case, and an operation panel is provided on a front surface. On the operation panel, a display signal such as a measured value, a signal showing an abnormality, and the like are displayed, and a specific signal to be displayed, for example, a real-time measured value of current and voltage, and the like are displayed by a change-over switch or the like.
In the case of detecting a fault or the like in a power system, a conventional digital protective relay device outputs a disconnection signal to a shutter such as a circuit breaker and displays information of a protective element to be operated and a corresponding phase on an operation display in order to open and limit a section such as a fault. At this time, the maintenance/user confirms the operation state by the operation display of the digital protection relay device when a failure or the like occurs or when the maintenance is checked.
However, if a power failure occurs due to manual operations or the like other than a failure, the digital protective relay device may be erroneously determined to be failed even if it does not fail, and unnecessary cause determinations, confirmation tests of soundness, or the like have to be performed.
For the above problems, the applicant has proposed a digital protective relay device as follows: by providing a display unit for displaying an operation during operation and an operation record recorded in a memory at the start of operation on an operation panel, even when a power failure occurs due to a manual operation or the like other than a failure, it is possible to distinguish and determine whether the operation is a forgetting recovery of an operation display due to a power failure or an operation due to a failure or the like (see patent document 1).
A protective relay device is disclosed that stores a plurality of time-series data from the occurrence of a fault or the like to the passage of a predetermined time and displays the data at the designated time (see patent literature 2).
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 2010-273515
Patent document 2: japanese patent laid-open publication No. 2011-139554
Disclosure of Invention
Technical problem to be solved by the invention
As described above, in the conventional digital protective relay apparatus, a malfunction or the like and a power failure are triggered, and an operation is recorded. Therefore, although the failure or power failure is not caused, when the state of the display unit or the alarm lamp is changed or when the input/output contact of the digital protective relay device itself is operated, it is difficult to confirm whether the failure or power failure is caused by a manual operation or an abnormal operation of the device, that is, to confirm the cause of the failure or power failure.
The present application discloses a technique for solving the above-described problems, and an object thereof is to provide a digital protective relay device capable of confirming whether a change in display content of a display portion 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 manual operation or an abnormal operation of the digital protective relay device itself.
Technical proposal adopted for solving the technical problems
The 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 power 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 a determination result of the operation processing unit; a display unit that sets display items using an input from an operation unit or an input from an external device, and displays an output from the arithmetic processing unit based on the set display items; and a lamp unit that displays an operation state of itself, wherein the operation processing unit records a setting content and an input time of the display item after a predetermined time passes under the set display item when the display item is set by using 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 using an input from the operation unit or an input from the external device.
The operation method of the digital protective relay device disclosed in the present application is an operation method of the digital protective relay device including an operation processing unit that converts an input analog electric power into a digital signal and performs an operation process using the digital signal, an output circuit that generates an operation signal for operating a circuit breaker based on a determination result of the operation processing unit and outputs the operation signal, 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 operation processing unit according to the set display item, and a lamp unit that displays an operation state of the lamp unit, and is characterized in that: the display item is set by an input from the operation unit or an input from an external device, a set content and an input time of the display item are recorded after a predetermined time passes under the set display item, when an operation signal of the circuit breaker is generated by the input from the operation unit or the input from the external device, a generation time of the operation signal is recorded, when a protected device of the digital protection relay device fails and the display item set in the display unit changes, the recorded set content and input time of the display item are read, and when the protected device of the digital protection relay device fails and a lighting state of the lamp unit changes, the recorded generation time of the operation signal of the circuit breaker is read.
Effects of the invention
According to the digital protective relay device and the operation method of 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 the manual 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 input processing of an operation unit of the digital protective relay device according to embodiment 1.
Fig. 4 is a flowchart showing a recording procedure of input processing 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 for recording a change in a display item of the digital protective relay device according to embodiment 2.
Fig. 7 is a flowchart showing a recording procedure when a signal output from a contact 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 reference numerals are used to designate the same or corresponding parts.
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, the digital protective relay apparatus 1 includes: an input circuit 11 for inputting analog electric power such as current and voltage from the protected device and converting the analog electric power into digital; an input circuit 12, the input circuit 12 inputting a signal when the signal is input to a contact point between a signal generated when the operation portion 811 of the operation panel 81 is operated and a signal from an external device; a calculation processing unit 21, wherein the calculation processing unit 21 performs a predetermined calculation process 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, the display unit 51 displaying the state of the protected device based on the output of the arithmetic processing unit 21; a lamp unit 61 for displaying the operation status of the digital protective relay 1 according to the status of the protected equipment based on the output of the operation processing unit 21; and a communication circuit 71, wherein the communication circuit 71 transmits and receives data between the operation processing unit 21 and the external monitoring device 2.
The arithmetic processing unit 21 may include a CPU (Central Processing Unit: central processing unit) as an arithmetic processing device. The arithmetic processing device may also include various logic circuits such as an ASIC (Application Specific Integrated Circuit: application specific integrated circuit), an IC (Integrated Circuit: integrated circuit), and a DSP (Digital Signal Processor: digital signal processor), various signal processing circuits, and the like. The storage device 23 exchanges data with the operation processing unit 21, and may include a RAM (Random Access Memory: random access Memory) configured to be able to Read and write data from and to the operation processing unit 21, a ROM (Read Only Memory) configured to be able to Read data from the operation processing unit 21, and the like. The storage device 23 includes at least a nonvolatile memory (EEPROM: electrically Erasable Programmable Read Only Memory, electrically erasable programmable read only memory) and stores signals, state change information, and the like input from the input circuit 12 described later.
The arithmetic processing unit 21 performs various arithmetic processing using the digital signal from the input circuit 11, detects a failure or the like of a protected device (not shown), and determines whether or not to operate a circuit breaker or the like (operation determination). The display signal for the display unit 51 and the lighting signal for the lamp unit 61 are generated and output by 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 operation processing unit 21.
The external monitoring device 2 is constituted by a PC (personal computer) or the like, is connected to one or a plurality of digital protective relay devices 1, appropriately receives information of the arithmetic processing unit 21, and monitors the operation 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 cable or wireless. A network may be formed between a plurality of digital protective relay apparatuses 1 and connected via the 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 configured by a switch, a knob, or the like, and performing input such as selection of a display item, switching of setting contents, and resetting of the digital protective relay device 1; and a lamp portion 61 that is turned on and shows the operating condition (on and off of the circuit breaker) of the digital protective relay device 1 and an abnormality of the digital protective relay device 1 itself.
The display item indicates which item of the measured value and the set value is displayed on the display unit 51, and for example, indicates a current value, a voltage value, and the like during measurement.
The lamp unit 61 generally includes a plurality of lamps, and displays the operation status of the digital protective relay apparatus 1 itself including whether or not an operation signal of the circuit breaker is generated.
Although it may be provided on the lateral part or the rear surface, the external monitor device may include an input terminal 812 for inputting contacts from an external device such as a PLC, and an output terminal 813 for outputting from the external monitor device 2.
The operation will be described by taking a case where the digital protective relay device 1 is mounted on a power distribution facility as an example.
The operator confirms the display items displayed on the display unit 51 of the operation panel 81, the measurement values corresponding thereto, the lighting condition 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 is checked, the switch of the operation unit 811 is continuously pressed and the content is checked until a predetermined display item appears. In the case of starting measurement or monitoring of the power distribution equipment, input is made through a switch and ended so that confirmation of measurement contents and display of measurement items become appropriate.
When input is performed from an external device such as a PLC, the display content of the display unit 51 is set by a signal from the arithmetic processing unit 21 through the input terminal 812 and the input circuit 12 by changing input information from the outside.
When a fault or the like occurs in the power distribution equipment as the protected equipment and the circuit breaker becomes on, a predetermined lamp of the lamp section 61 where the circuit breaker is on is lighted. The operator confirms the contents of the lighted lamp and the display unit 51, presses the switch of the operation unit 811, confirms the contents of the display unit 51, and searches for the cause of occurrence of the failure or the like. In the case of a fault or the like, a history of the fault current, the elapsed time until the operation of the circuit breaker, and the like is recorded in the storage device 23, and the cause of occurrence can be confirmed by reading this information.
The above operations are performed based on functions of the normal digital protective relay device 1.
Next, a procedure of determining whether or not the measurement display item set at the start of the measurement or the monitoring is manually operated when the display unit 51 is changed will be described.
Fig. 3 is a flowchart showing a recording procedure of input processing of the operation unit of the digital protective relay apparatus 1 according to embodiment 1.
When the operator presses a switch of the operation unit 811, for example, a switching 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 from the operation unit 811 (step S12).
In order to confirm the display contents 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 the state of the display item after the display item according to the operation of the operation unit 811 is set, it is considered that measurement or monitoring is started. In step S13, it is confirmed that the display item has not changed for a predetermined time. If the switch of the operation unit 811 is pressed for a predetermined time (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 changing the display item (yes in step S13), the arithmetic processing unit 21 records and stores the setting content and the input time of the unchanged display item 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, if the switch is chatter, or if the operation of pressing and releasing the switch is continuously performed, a large amount of information is stored in the storage device 23 at a high speed. 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 for which the display item is not changed, and the measurement or monitoring is regarded as the start may be set to about several tens of seconds depending on the device to be protected, the operator, and the like. As described above, in the confirmation of the display content or the check setting operation, since the switch is repeatedly pressed in a short time, it is sufficient to confirm that the display content has not been changed within several tens of seconds. If the next operation unit 811 is operated to perform the output processing within the set predetermined time, it is sufficient to record with a new display item after the lapse of the predetermined time.
The display content may be set and recorded in the nonvolatile memory of the storage device 23 after a predetermined time has elapsed. For example, if the storage capacity is 20 times, the positions of the 1 st time are sequentially written and the 21 st time is covered, but the latest information for starting the measurement or 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: programmable logic controller). Fig. 4 is a flowchart showing a recording procedure of input processing from an external device to the digital protective relay apparatus 1 according to embodiment 1.
The input from the 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 the predetermined time has elapsed after the input of the display item, the measurement or monitoring is regarded as started, and thus 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 content and the input time of the unchanged display item in the storage device 23 (step S24).
In the case where the input from the outside is performed within a predetermined time, the input information and the input timing may be repeatedly acquired in the same manner as the input from the operation unit 811 described above, and the latest information for starting the measurement or the monitoring or the information of a size several times from the latest may be stored using the nonvolatile memory.
Next, the following reason is explained, namely: even if there is no malfunction of the power distribution equipment as the protected equipment, the display item of the display unit 51 is changed from the setting.
When a failure or the like of the power distribution equipment occurs, the display unit 51 may display items other than the display items set in advance.
When the display item set at the start of measurement or monitoring is changed without any trouble 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, the digital protective relay device 1 is considered to be 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 sequentially read from the latest input setting information and traced back to the timing at which the input setting information matches or approaches the initial setting information, the passage of the input can be grasped.
Next, a step of determining whether or not the lighting state of the lamp unit 61 has changed even if there is no malfunction of the power distribution equipment as the protected equipment, etc., is performed by a manual operation.
Fig. 5 is a flowchart showing a procedure of recording input processing relating to the operation of the circuit breaker performed in the digital protective relay device 1 according to embodiment 1.
When the operator presses the forced breaker operation switch of the operation unit 811, for example, the switching operation is input by the input circuit 12 (yes at step S31). The same applies to the case of input from an external device. The arithmetic processing unit 21 acquires the time input from the operation unit 811 and stores the time in the storage device 23 (step S32).
For example, when checking the power distribution equipment as the protected equipment and the digital protection relay device 1, a forced breaker operation switch may be input. However, the possibility of abnormality of the digital protective relay device 1 itself cannot be denied. Therefore, if the input record according to the manual operation is stored as shown in fig. 5, if the lighting state of the lamp unit 61 is changed even if there is no malfunction of the power distribution equipment as the protected equipment, etc., it can be determined whether or not this is caused by the manual operation by confirming 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 the information input from the operation unit 811 or the input from the external device at the start of measurement or monitoring is recorded and the input information for lighting the lamp by the input from the operation unit 811 or the input from the external device is recorded, it is possible to confirm whether the display change of the digital protective relay device is caused by a manual operation or an abnormal operation of the device.
In this embodiment, the following will be described by way of example, namely: in addition to the input from the operation unit 811 or the information input from the external device in embodiment 1, the information of the output signal from the arithmetic processing unit 21 or the output circuit 31 is recorded and used.
The display signal output to the display unit 51 or the lighting signal output to the lamp unit 61 is generated in accordance with the instruction of the arithmetic processing unit 21. If an abnormality occurs, the input from the operation unit 811 or the input from the external device described in embodiment 1 is integrated with the display item displayed on the display unit 51. That is, the operation processing unit 21 generates a signal of the 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, the signal generation of the display item of the display unit 51 in the arithmetic processing unit 21 may be recorded, and compared with the input from the operation unit 811 or the record of the contact input from the external device. The record of signal generation of the display item of the display unit 51 in the arithmetic processing unit 21 corresponds to the record of change of the display item of the display unit 51.
Fig. 6 is a flowchart showing a procedure for recording a change in a display item of the digital protective relay apparatus 1 according to embodiment 2.
When the display item of the display unit 51 is changed, that is, when a new signal is generated by the arithmetic processing unit 21 for the display unit 51 (yes in step S41), information such as the change time, the changed display item, and the display value is stored, and the storage device 23 is recorded and stored (step S42). The stored information corresponds to a signal related to the setting content of the display item generated by the arithmetic processing unit 21 and the output time thereof.
The record may be saved as a record of 20 times size, for example, using a non-volatile memory of the storage device 23. Even if recording is performed at each change, the recording from the start of measurement or monitoring may be kept. 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 writes to the memory can be reduced, and the load on the arithmetic processing unit 21 can be reduced.
Next, the following reason is explained, namely: even if there is no malfunction of the power distribution equipment as the protected equipment, the display item of the display unit 51 is changed from the setting.
In the event of a failure or the like of the power distribution equipment, the display unit 51 may display items other than the display items set in advance.
When the display unit 51 changes the initial setting information at the start of measurement or monitoring without a failure of the power distribution equipment or the like, the setting content of the display item recorded in the storage device 23 and the input time (input setting information) thereof are read. The setting content of the display item generated by the operation processing unit 21 recorded in the storage device 23 and the output time (hereinafter, referred to as output setting information) thereof are read.
When the content and time (initial setting information) of the set display item match the read input setting content, the digital protective relay device 1 is considered to be 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 causes is considered to be a problem in the signal generation by the arithmetic processing unit 21. When a signal of output setting information different from input setting information is generated after the lapse of time based on the read input setting information, the cause of the trigger signal generation is investigated.
The initial setting information may be determined to be an artificial input when the read input setting information is updated. That is, it is known that the input is made from the operation unit 811 or the contact input is made from the external device after the initial time of starting the 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 operation processing unit 21 generates a signal of the display item of the corresponding display unit 51 based on the input from the operation unit 811 or the input from the external device.
The lighting signal output to the lamp unit 61 is also generated in response to a command from the arithmetic processing unit 21. Therefore, if there is an input from the operation unit 811 or an input from the circuit breaker operation of the external device, the predetermined lamp unit 61 is turned on according to the signal generated by the instruction of 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 there is a relationship with the failure of the power distribution equipment or the like.
In fig. 6, the change record of the display item is changed to be the lighting state change record of the lamp unit, and the recording step 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 changing timing and the type of lamp after the change, the lighting item, and the like is acquired, and the information is recorded and stored in the storage device 23 (step S42). There are also cases where 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 recorded and stored.
As in the case of the display signal for the display unit 51 described above, the record may be stored as a record of 20 times, for example, using the nonvolatile memory of the storage device 23. Even if recording is performed at each change, the recording from the start of measurement or monitoring may be kept. 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 writing operations to the memory can be reduced, and the load on the arithmetic processing unit 21 can be reduced.
Next, a step of determining whether or not the lighting state of the lamp unit 61 has changed even if there is no malfunction of the power distribution equipment as the protected equipment, etc., is performed by a manual operation.
When a failure or the like of the power distribution equipment occurs, the predetermined lamp portion 61 is turned on by the operation of the circuit breaker or the like.
Since the lamp unit 61 shows an abnormality of the digital protective relay device 1 itself or the like, when there is no abnormality of the digital protective relay device 1 itself or no failure of the power distribution equipment or the like, the input information recorded in the storage device 23 and input to the lamp unit 61 is read when the lighting state of the lamp unit 61 is changed. The signal output information for the lamp unit 61 generated by the operation 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 due to a human operation.
The output circuit 31 outputs an operation signal to the relay 41 for operating the switch provided in the circuit breaker based on the operation determination result of the operation processing unit 21, and if a record of the generation of the signal is stored, it is possible to confirm whether or not there is a relationship with a fault or the like of the power distribution equipment.
Fig. 7 is a flowchart showing a recording procedure when a contact operation signal of a circuit breaker is generated by the output circuit of the digital protective relay device 1 according to embodiment 2.
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 the information of the signal generation timing are acquired, and the information is 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 the fault occurrence information in searching for a cause of a change in the display item of the display unit 51 from the setting even if there is no fault or the like of the power distribution equipment as the protected equipment will be described.
When the display item set at the start of measurement or monitoring is changed without any trouble of the power distribution equipment, the setting content of the display item and its input time (input setting information) recorded in the storage device 23, the setting content of the display item and its output time (output setting information) generated by the arithmetic processing unit 21 recorded in the storage device 23, and trouble occurrence information are read.
When the content of the set display item is 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 is possible to confirm that no failure or the like of the power distribution equipment has occurred while the display item has been changed.
In addition, the above-described failure occurrence information can be effectively used in searching for a cause of a change in the lighting state of the lamp unit 61 even if there is no failure of the power distribution equipment as the protected equipment.
As described above, according to embodiment 2, the same effects as those of embodiment 1 are obtained. That is, it is possible to provide a digital protective relay device capable of confirming whether a display change of the digital protective relay device is caused by a manual 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 operation 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 is generated by the output circuit 31 based on the operation determination result of the operation processing unit 21. All three may be generated by the arithmetic processing unit 21 or may be generated by the output circuit 31.
In embodiments 1 and 2 described above, the switch input of the operation portion 811 of the operation panel 81 is illustrated, but if the display portion 51 is a touch panel type display portion, the display portion and the operation portion may be used as both the display portion and the operation portion.
In embodiments 1 and 2, the record of the input setting information, the output setting information, and the like is stored 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 the above embodiments 1 and 2, the description has been made taking the protection object of the digital protection relay device 1 as an example of the power distribution equipment, but the present invention is not limited to this, and the present invention is applicable to protection and monitoring of motors and the like.
While various exemplary embodiments and examples have been described in this disclosure, the various features, aspects, and functions described in one or more embodiments are not limited to being applicable to a particular embodiment, but can be applied to embodiments alone or in various combinations.
Accordingly, numerous modifications, not illustrated, are contemplated as falling within the scope of the technology disclosed in the present specification. For example, the case where at least 1 component is deformed, the case where at least 1 component is added or the case where at least 1 component is omitted, and the case where at least 1 component is extracted and combined with the components of other embodiments are included.
Description of the reference numerals
1: digital protective relay device, 2: monitoring devices, 11, 12: input circuit, 21: operation processing unit, 23: storage device, 31: output circuit, 41: relay (Ry), 51: display portion, 61: lamp portion, 71: communication circuit, 81: operation panel, 811: operation unit, 812: input terminal, 813: and an output terminal.
Claims (6)
1. A digital protective relay device, which comprises a relay body,
the digital protective relay device includes an arithmetic processing section that converts an analog electric quantity inputted into a digital signal and performs arithmetic processing using the digital signal, and is characterized by comprising:
an output circuit that generates and outputs an operation signal for operating the circuit breaker based on a determination result of the operation 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 based on the set display item; and
a lamp unit which shows the operation status of the lamp unit itself,
the arithmetic processing unit:
when the display item is set by an input from the operation unit or an input from the external device, after a predetermined time elapses under the display item to be set, setting contents and input time of the display item are recorded,
in the case of generating an operation signal of the circuit breaker by using an input from the operation section or an input from the external device, an input timing from the operation section or the external device is recorded,
in addition, a record of the generation of a signal of a display item of the display unit or a record of the generation of an operation signal of the output circuit in the arithmetic processing unit is stored in a storage device, and compared with a record of an input from the operation unit or an input from the external device, and whether the two are identical is determined.
2. A digital protective relay as defined in claim 1, wherein,
the arithmetic processing unit records a change time and the changed display item when generating a setting signal for the display item of the display unit and changing the display item of the display unit.
3. A digital protective relay as claimed in claim 1 or 2, characterized in that,
the arithmetic processing unit records a change time and a changed lighting state when generating a lighting signal of the lamp unit and changing the lighting state of the lamp unit.
4. A digital protective relay as claimed in claim 1 or 2, characterized in that,
the operation processing unit records a time when an operation signal is generated by the output circuit based on a determination result and the circuit breaker is operated, and the determination result.
5. A digital protective relay as defined in claim 3, wherein,
the operation processing unit records a time when an operation signal is generated by the output circuit based on a determination result and the circuit breaker is operated, and the determination result.
6. A method for operating a digital protective relay,
the digital protective relay device includes: an arithmetic processing section that converts the inputted 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 a determination result of the operation 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 based on the set display item; and a lamp unit which shows an operation state of itself, wherein the operation method of the digital protective relay device is characterized in that,
setting the display item by using an input from the operation unit or an input from the external device, recording a setting content and an input timing of the display item after a predetermined time passes under the set display item,
in the case of generating an operation signal of the circuit breaker by using an input from the operation unit or an input from the external device, a generation timing of the operation signal is recorded,
in addition, the generation record of the signal of the display item of the display unit or the generation record of the operation signal of the output circuit in the operation processing unit is stored in a storage device, and compared with the record of the input from the operation unit or the input from the external device to determine whether the two are identical,
when the protected equipment of the digital protective relay device has not failed and the display item set in the display part has changed, the recorded setting content and input time of the display item are read,
when the device to be protected of the digital protective relay device is not failed and the lighting state of the lamp unit is changed, the recorded time of generation of the operation signal of the circuit breaker is read.
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 CN111801865A (en) | 2020-10-20 |
| CN111801865B true 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) |
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| 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 JP JP2020504627A patent/JP7026772B2/en active Active
- 2018-03-09 KR KR1020207023729A patent/KR102490435B1/en active IP Right Grant
- 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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| JP2005006448A (en) * | 2003-06-13 | 2005-01-06 | Tm T & D Kk | Digital protective relay |
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Also Published As
| Publication number | Publication date |
|---|---|
| TWI680620B (en) | 2019-12-21 |
| CN111801865A (en) | 2020-10-20 |
| KR102490435B1 (en) | 2023-01-19 |
| JP7026772B2 (en) | 2022-02-28 |
| KR20200105943A (en) | 2020-09-09 |
| TW201939837A (en) | 2019-10-01 |
| JPWO2019171583A1 (en) | 2020-10-22 |
| WO2019171583A1 (en) | 2019-09-12 |
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