JP2013090550A - Digital protection and control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protection and control device which reduces a workload of operation and maintenance personnel with respect to a transient failure and facilitates operation and maintenance.SOLUTION: When a failure alarm is output, operation and maintenance personnel output a re-start signal from a controller 70 for remote control to a protection and control device 10 in which a failure occurs. By the re-start signal, operation conditions of a main relay 40 of the protection and control device 10 are satisfied, and the main relay 40 operates. Operation of the main relay 40 of which a number of contacts is increased by an auxiliary relay 50 activates operation of a b-contact 50b of the auxiliary relay 50, and thereby power source lines P2 and N2 are made open. Power feeding to an arithmetic control unit 20 of the protection and control device 10 connected to the power source lines P2 and N2 is interrupted, and the arithmetic control unit 20 is reset.

Description

  Embodiments described herein relate generally to a digital protection control apparatus to which a microcomputer (hereinafter abbreviated as CPU) is applied.

  The digital protection control device that protects the power system inputs the amount of electricity and state of the power system, converts it into a digital amount, performs a predetermined protection control calculation using this digital amount, and shuts off according to the calculation result The power system is protected and controlled by controlling devices such as electric appliances. In general, the digital protection control apparatus incorporates an automatic monitoring function for confirming the soundness of the relay itself.

The automatic monitoring function is configured around a self-diagnosis function of the CPU. When an abnormality of the peripheral device of the microcomputer is detected by the self-diagnosis function, the display / alarm is output and, if necessary, the following processing is performed to control the apparatus so as not to react unfavorably.
(1) Use a hardware circuit to disable the device.
(2) Use software to make sure that the device does not output errors.
(3) Set the CPU to the stopped state.

  The following prior art is known for dealing with a case where any failure occurs in the digital protection control device.

Electrical Cooperation Research Vol.59, No.1 (pp.109-115) Electric Cooperative Research Vol. 65, No. 2 (86 pages)

JP 2008-131673 A JP 2000-092818 A

  When a failure occurs in the protection relay device, in the extreme case, there is a possibility that it may interfere with the stable operation of the power system, such as system breakdown due to loss of the protection function. Therefore, it is necessary to promptly restore the protection relay device in which the failure has occurred to the original operation state.

  Most of the faults during the operation of the protection relay device can be detected by the automatic monitoring function provided in the device. As a specific response when a failure is detected, the device recovery operation is performed through the following processes (1) to (6). After these recovery operations are completed, system operation is resumed.

(1) Determine the status of failure occurrence.
(2) Take first aid measures in case of failure.
(3) Report the failure information to relevant places.
(4) Visit the relevant electric power station and investigate the details of the failure.
(5) Recover the failure.
(6) After the failure is repaired, conduct a confirmation test of the relevant part.

  In general, such process failure handling is performed regardless of whether the content of the failure is transient or permanent. For this reason, in spite of a transient failure, a great deal of effort is required for the recovery work.

  For example, when a transient failure occurs in the CPU and its peripheral circuits, an IC which is a main element constituting the CPU circuit temporarily enters a malfunction state due to a factor such as a so-called hot carrier phenomenon. However, after the phenomenon is resolved, the IC itself returns to the normal operation state without leaving any trace of failure. Therefore, it is inappropriate to take the same process failure response as a permanent failure for such a transient failure.

  As measures to avoid over-detection of transient failures, a continuous monitoring timer and frequency monitoring timer are incorporated in the failure detection circuit in the automatic monitoring circuit, and an alarm is output to the outside only when a certain period of time has elapsed. It is common practice to take measures to do this. However, for example, if there is a setting mismatch in the timer for determining the duration of the transient failure, it is assumed that the transient failure is regarded as a permanent failure and an external alarm output is reached.

  When a transient failure occurs, the failure part itself often returns to a healthy state after the phenomenon is resolved. In that case, it is possible to restore the apparatus to a sound operation state by restarting the corresponding apparatus. However, in the prior art, when a failure alarm is output, regardless of whether the failure content is permanent or transient, the operation maintenance staff is dispatched to the electrical station where the failure has occurred and various routines are defined. Perform the operation.

  At this time, if the failure content is a transient failure, for example, the device is often restored to a healthy state by performing an operation to kill the control power supply circuit installed in the device. In such a case, the restoration work itself performed by the operation and maintenance staff visiting the electric station is not necessarily an indispensable act.

  An object of an embodiment of the present invention is to provide a protection control device that reduces the work burden of an operation maintenance worker against a transient failure and facilitates operation maintenance.

  An embodiment of the present invention is a digital protection control device having an arithmetic control unit that inputs a quantity of electricity in a power system and converts it into a digital quantity to perform a predetermined calculation. A restart signal detecting unit for detecting a restart signal from a remote control unit provided at a location, and means for restarting the arithmetic control unit based on the restart signal detected by the restart signal detecting unit. It is characterized by having.

  As the means for restarting, a device for activating the power input of the arithmetic control unit based on the restart signal from the restart signal detector can be used.

  The arithmetic control unit includes a restart control unit for executing the restart, and an input circuit for inputting a restart signal from the restart signal detection unit, and the means for restarting the arithmetic control unit includes: The restart control unit of the arithmetic control unit may be operated based on the restart signal received by the input circuit from the restart signal detection unit.

  The arithmetic control unit may include a restart signal receiving unit formed by integrating the restart signal detecting unit and the input circuit for inputting the restart signal from the restart signal detecting unit.

The block diagram which shows 1st Embodiment. The block diagram which shows 2nd Embodiment. The block diagram which shows 3rd Embodiment.

[1. First Embodiment]
Below, 1st Embodiment of this invention is described using FIG.

[1-1. Constitution]
In FIG. 1, 10 is a digital protection control device, 20 is an arithmetic control unit housed in the digital protection control device 10, and 90 is an external power supply circuit for supplying control power to the digital protection control device 10. Reference numeral 30 denotes a power control switch for activating the power input from the external power circuit 90.

  Reference numeral 40 denotes a restart signal detection unit that restarts the protection control device 10 according to a command from a distance. In the present embodiment, the restart signal detection unit 40 is configured by a main relay to which operating conditions are input by remote operation. 50 is an auxiliary relay for amplifying the contact of the main relay 40, and 50 b is a b contact of the auxiliary relay 50. The main relay 40 is connected to a control unit 70 installed in a control station where an operation maintenance worker normally works. A restart signal output by a remote operation from the control unit 70, that is, an operation condition Operates by input.

  Since the restart signal from the control unit is for restarting the protection control device 10, the operating condition for the main relay 40 is canceled after a predetermined time after outputting the operating condition for the main relay 40. To do.

  P0, P1, and P2 are positive power lines for control power input, and N0, N1, and N2 are negative power lines for control power input. In the present embodiment, the contact 50b of the auxiliary relay 50 that amplifies the restart signal detection unit 40 is disposed at the subsequent stage of the power lines P1 and N1 introduced through the power control switch 30, and the power line located at the subsequent stage. P2 and N2 are connected to the arithmetic control unit 20.

[1-2. Action]
The operation of the present embodiment configured as described above is as follows.

  When the failure alarm is output, the operation maintenance worker outputs a restart signal from the remote control unit 70 to the protection control device 10 in which the failure has occurred. By this restart signal, the operating condition of the main relay 40 of the protection control device 10 is established, and the main relay 40 is activated.

  The operation of the main relay 40 is contact-amplified by the auxiliary relay 50, whereby the b-contact 50b of the auxiliary relay 50 is operated and the power lines P2 and N2 are opened. As a result, the power supply to the arithmetic control unit 20 of the protection control device 10 connected to the power supply lines P2, N2 is cut off, and the arithmetic control unit 20 is reset.

  Thereafter, when a predetermined period of time elapses, the operation condition for the main relay 40 is released from the control unit 70, so that the main relay 40 enters a non-operating state. Accordingly, the b contact 50b of the auxiliary relay 50 is closed, and power supply to the arithmetic control unit 20 is started from the power supply lines P2 and N2.

  In this way, the power input from the external power supply circuit 90 to the arithmetic control unit 20 of the protection control device 10 is activated by an operation from a remote control unit by the operation maintenance staff, and the CPU incorporated in the arithmetic control unit 20 And its peripheral circuits are restarted.

[1-3. effect]
According to the present embodiment, even when the CPU and its peripheral circuits built in the arithmetic and control unit are abnormal due to a temporary failure factor, the operation maintenance staff can be found at the electric station where the defect has occurred. It is possible to restore the device to a healthy state without going out and performing various restoration operations for restoring the device.

  In the present embodiment, since the power supply lines P2 and N2 are activated by the main relay 40 provided outside the arithmetic control unit 20, there is no need to change the arithmetic control unit 20 itself. Therefore, it can be easily applied to the existing protection control device 10 simply by installing a relay.

[2. Second Embodiment]
A second embodiment will be described with reference to FIG.

[2-1. Constitution]
In the present embodiment, the arithmetic control unit 20 receives an instruction from the input circuit 20a to which the restart signal from the restart signal detector 40 is input, and the CPU of the arithmetic control unit 20 and A restart control unit 20b for restarting the peripheral circuit is provided. The restart control executed by the restart control unit 20b is provided as standard in a system with a built-in CPU, and known means can be employed.

  In the present embodiment, the restart signal detection unit 40 can use a main relay similar to that of the first embodiment. In addition to the main relay, other circuits and components can be used as long as the operation condition from the remote control unit 70 is detected and a restart signal is output to the input circuit 20.

[2-2. Action]
In this embodiment, when the restart signal detection unit 40 receives the restart signal from the remote control unit 70, the restart signal detection unit 40 transmits the restart signal to the input circuit 20 a of the arithmetic control unit 20. The restart signal input to the input circuit 20a is input to the restart control unit 20b. Based on this restart signal, the arithmetic control unit 20 restarts the CPU and its peripheral circuits. As a result, the same processing as the restart of the CPU and its peripheral circuits caused by activating the control power supply 90 described in the first embodiment is executed.

[2-3. effect]
According to the present embodiment, even when the CPU and its peripheral circuits built in the arithmetic and control unit are abnormal due to a temporary failure factor, the operation maintenance staff can be found at the electric station where the defect has occurred. It is possible to restore the device to a healthy state without going out and performing various restoration operations for restoring the device.

  In addition, in this embodiment, the power supply to the arithmetic control unit 20 is not activated, but only the CPU of the arithmetic control unit 20 and its peripheral circuits are restarted. As a result, it is possible to restart while securing the power supply to the other parts of the arithmetic control unit 20.

[3. Third Embodiment]
A third embodiment will be described with reference to FIG.

[3-1. Constitution]
In the present embodiment, the arithmetic control unit 20 is provided with a receiving circuit 20c for receiving a remote control signal from an external control unit. The receiving circuit 20c is an integrated circuit of the restart signal detection unit 40 and the restart signal input circuit 20a shown in the second embodiment. The input side of the receiving circuit 20c is connected to a remote control unit 70 provided at a remote control station or the like via a communication circuit 701. The output side of the receiving circuit 20c is connected to a restart control unit 20b provided in the arithmetic control unit 20 as in the second embodiment.

[3-2. Action]

  In the present embodiment, the restart signal from the remote control unit 70 is received by the receiving circuit 20c of the arithmetic control unit 20 via the communication circuit 701. The receiving circuit 20c gives the received restart signal to the restart control unit 20b. As a result, the arithmetic control unit 20 restarts the CPU and its peripheral circuits based on this restart signal.

[3-3. effect]
According to this embodiment, even when the CPU and its peripheral circuits built in the arithmetic control unit 20 are abnormal due to a temporary failure factor, the operation maintenance staff It is possible to restore the device to a healthy state without going to step 2 and performing various restoration operations for restoring the device.

  Further, in the present embodiment, the arithmetic control unit 20 is provided with a receiving circuit 20c in which the restart signal detection unit 40 and the restart signal input circuit 20a are integrated, so that a main relay or the like is provided outside the arithmetic control unit. There is no need to provide a separate restart signal detector. Since the restart signal from the remote control unit 70 can be directly input to the arithmetic control unit 20 via the communication circuit 701, the configuration of the protection control device 10 can be simplified.

[4. Other Embodiments]
Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

10: protection control device 20: arithmetic control unit 20a: input circuit 20b: restart control unit 20c: receiving circuit 30: power control switch 40: restart signal detection unit (main relay)
50: auxiliary relay 50b: b contact 70: remote control unit 701: communication circuit 90: external power supply circuit P1: power supply line P2: power supply line

Claims (4)

In a digital protection control device having an arithmetic control unit that inputs a quantity of electricity of a power system, converts it into a digital quantity and performs a predetermined calculation,
A restart signal detection unit for detecting a restart signal from a remote control unit provided at a location distant from the installation location of the digital protection control device;
A digital protection control device comprising means for restarting the arithmetic control unit based on a restart signal detected by the restart signal detection unit.   2. The digital apparatus according to claim 1, wherein the means for restarting the arithmetic control unit is a device for activating the power input of the arithmetic control unit based on a restart signal from the restart signal detector. Protection control device. The arithmetic control unit includes a restart control unit for executing the restart, and an input circuit for inputting a restart signal from the restart signal detection unit,
The means for restarting the arithmetic control unit operates the restart control unit of the arithmetic control unit based on the restart signal received by the input circuit from the restart signal detection unit. The digital protection control device according to claim 1. The arithmetic control unit includes a restart signal receiving unit formed by integrating the restart signal detecting unit and the input circuit for inputting the restart signal from the restart signal detecting unit. The digital protection control device according to claim 3.

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