JP5694006B2 - Monitoring device - Google Patents

Description

  Embodiments of the present invention relate to, for example, a monitoring device that monitors an operating state of a power distribution facility.

  It consists of multiple circuit breakers and multiple protective relays that detect short circuits and ground faults that occur in facilities such as generators, transformers, and power transmission lines that make up the power system, and isolate accidents at high speed. A monitoring device (central monitoring device) for monitoring the operating state and the like of the power receiving / distributing equipment is known.

  Usually, in maintenance of power distribution facilities, it is desirable to know the number of circuit breaker interruptions for each type of interruption. However, the conventional technique can count the number of circuit breaker interruptions, but cannot be counted individually for each type of interruption.

Japanese Patent No. 4253310

  The problem to be solved by the present invention is that the number of breaks of the circuit breaker in the power distribution facility can be individually grasped for each type of accidental break, load break, no load break, and maintenance of the power distribution facility It is providing the monitoring apparatus which can be useful for.

The monitoring device according to the embodiment is a monitoring device for monitoring a power receiving and distribution facility having at least a circuit breaker, a protective relay, and a load current measuring unit, and is an open / closed state signal of the circuit breaker, an operation signal of the protective relay, and the load Input means for inputting the measured value of the current measuring means, operation means for outputting a maintenance-in-progress signal indicating that maintenance is being performed by an operator operating when the breaker is under maintenance, and input by the input means The circuit breaker open / closed state signal, the operation signal of the protective relay and the measured value of the load current measuring means, and the output of the in- maintenance signal from the operating means , at least accidental interruption of the breaker, Determining means for determining whether the load is interrupted or no load is interrupted, and the accident interrupting, load interrupting, and no load are determined by the determining means. It is provided with counting means for counting the cutoff frequency of the circuit breaker for each different sectional various.

The block diagram which shows typically the structure of the monitoring apparatus which monitors the operation state etc. of the power distribution equipment which concerns on embodiment. The flowchart explaining operation | movement of the principal part which concerns on embodiment. The figure explaining the criteria in the case of the possibility of accident blocking. The figure explaining the criterion in case there is no possibility of accident interception. The figure explaining the criteria in the case of having load current. The figure explaining the criterion in the case of no load current. The block diagram which shows typically the structure of the monitoring apparatus which monitors the operation state etc. of the power distribution equipment which concerns on other embodiment. The flowchart explaining operation | movement of the principal part which concerns on other embodiment.

Hereinafter, embodiments will be described with reference to the drawings.
FIG. 1 schematically shows the configuration of a monitoring device that monitors the operating state and the like of the power receiving and distributing equipment according to the present embodiment. In FIG. 1, 11 is a power receiving / distributing facility, and 12 is a monitoring device (central monitoring device) that monitors the operating state of the power receiving / distributing facility 11.

  The power distribution facility 11 includes, for example, a circuit breaker 14 that protects the system from an accident of the bus 13a and the branch line 13b branched from the bus 13a. The circuit breaker 14 includes an auxiliary contact 15 that outputs the open / close state signal S1.

The power distribution facility 11 includes, for example, a zero-phase current transformer 16 for detecting a zero-phase current due to a ground fault in the branch line 13b, an instrument transformer 17 for detecting a voltage of the branch line 13b, and a zero-phase change. A ground fault relay (protective relay) 18 is provided which operates based on the zero-phase current detected by the flow device 16 and the voltage detected by the instrument transformer 17.
The ground fault relay 18 operates in the event of a ground fault and outputs an operation signal S2. This operation signal S2 is input to the circuit breaker 14 as an open / close command signal.
Note that a ground fault direction relay may be used instead of the ground fault relay 18 or together with the ground fault relay 18.

The power distribution facility 11 includes, for example, an instrument current transformer 19 for detecting an overcurrent due to a short circuit of the branch line 13b or a ground fault, and an overcurrent relay that is activated by an overcurrent detected by the instrument current transformer 19 (Protective relay) 20 is provided.
The overcurrent relay 20 operates in the event of a short circuit or a ground fault and outputs an operation signal S3, and this operation signal S3 is input to the circuit breaker 14 as an open / close command signal.

  The power distribution facility 11 includes an instrument current transformer (load current measuring means) 21 for measuring the load current flowing through the branch line 13b, an ammeter 22 for displaying the load current measured by the instrument current transformer 21, A converter 23 for converting the output of the current transformer 21 to a predetermined current value S4 is provided.

  The monitoring device 12 is a digital signal that takes in the open / close state signal S1 from the auxiliary contact 15 that monitors the open / close state of the circuit breaker 14, the operation signal S2 from the ground fault relay 18, and the operation signal S3 from the overcurrent relay 20. An input unit 31, an analog signal input unit 32 for taking in the current value S4 from the converter 23, and a manual input unit (operation means for outputting a maintenance in-progress signal by the staff performing a billing operation when the circuit breaker 14 is under maintenance 33) Determination for determining whether the circuit breaker 14 has at least an accident interruption, a load interruption, or a no-load interruption using the opened / closed state signal S1, the operation signal S2, the operation signal S3, the current value S4, and the in-maintenance signal. The number of interruptions of the circuit breaker 14 is counted for each type of accident interruption, load interruption, and no-load interruption determined by the processing unit (determination unit) 34 and the determination processing unit 34. Count processing unit for Doo (counting means) 35, storage section for storing the counted number of counts per each type in count processing unit 35 constituted by (storage means) 36.

  In addition to the above functions, the monitoring device 12 records and displays the open / close state of the circuit breaker 14 by processing the incorporated open / close state signal S1, operation signals S2, S3, and the like. It comes to monitor.

  Next, the operation of the main part will be described with reference to the flowchart shown in FIG. 2 in such a configuration.

  First, the determination processing unit 34 determines whether or not there is a possibility of an accidental interruption during the breaking operation of the circuit breaker 14 (condition 1) (step S1). That is, for example, as shown in FIG. 3, when the open / close state signal S1 from the circuit breaker 14 changes from “ON” to “OFF”, an overcurrent or a ground fault occurs, that is, the ground If the operation signal S2 from the relay 18 or the operation signal S3 from the overcurrent relay 20 is “occurrence”, it is determined that there is a possibility of an accidental interruption.

  As shown in FIG. 4, when the open / close state signal S1 from the circuit breaker 14 changes from “ON” to “OFF”, no overcurrent or ground fault occurs, that is, the ground fault relay. When the operation signal S2 from 18 or the operation signal S3 from the overcurrent relay 20 is “return”, it is determined that there is no possibility of accident interruption (determination is not an accident interruption).

  If it is determined in step S1 that there is a possibility of an accident interruption, the determination processing unit 34 determines whether or not a billing setting indicating that the circuit breaker is under maintenance is performed, that is, maintenance is performed from the manual input unit 33. It is determined whether or not a signal is output (step S2), and when no maintenance signal is output (when no billing is set), it is determined that “accident interruption” (step S3), and count processing The number of “accident interruptions” is counted by the unit 35 (step S4) and stored in the storage unit 36 (step S5).

  When it is determined in step S1 that there is no possibility of accident interruption, and when a maintenance signal is output in step S2 (when billing is set), the determination processing unit 34 is not “accident interruption”. And whether or not there is a load current (condition 2) is determined based on the current value S4 (step S6). That is, it is determined whether it is “load interruption” or “no load interruption”. For example, as shown in FIG. 5, when the current value S4 immediately before the switching state signal S1 from the circuit breaker 14 changes from “ON” to “OFF” is equal to or greater than a predetermined value, it is determined that there is a load current. In this case, it is determined that the load is cut off (step S7), and the count processing unit 35 counts the number of times of “load cut off” (step S8), and stores it in the storage unit 36 (step S9).

  If it is determined in step S6 that there is no load current, that is, for example, as shown in FIG. 6, the current value S4 immediately before the switching state signal S1 from the circuit breaker 14 is changed from “ON” to “OFF” If it is less than a predetermined value, it is determined that there is no load current. In this case, it is determined as “no load interruption” (step S10), and the count processing unit 35 counts the number of “no load interruption” (step S10). S11), and accumulates in the accumulation unit 36 (step S12).

  Note that there is a configuration that does not include the manual input unit 33 that performs a billing operation when the circuit breaker 14 is under maintenance. In this case, the configuration is as shown in FIG. Further, the flowchart for explaining the operation of the main part is as shown in FIG. 8, which is different from FIG. 2 in that the process of step S2 is deleted, and the other parts are the same.

  As described above, according to the above-described embodiment, the number of circuit breaker interruptions in the power distribution facility can be individually grasped for each type of accident interruption, load interruption, and no-load interruption. It can be used for equipment maintenance.

  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 scope 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.

  DESCRIPTION OF SYMBOLS 11 ... Power distribution equipment, 12 ... Monitoring apparatus (central monitoring apparatus), 13a ... Bus line, 13b ... Branch line, 14 ... Breaker, S1 ... Opening / closing state signal, 15 ... Auxiliary contact, 16 ... Zero phase current transformer, 17 ... instrument transformer, 18 ... earth fault relay (protective relay), S2 ... operation signal, 19 ... instrument current transformer, 20 ... overcurrent relay (protection relay), S3 ... operation signal, 21 ... instrument current transformer (Load current measuring means), 22 ... ammeter, S4 ... current value, 23 ... converter, 31 ... digital signal input section (input means), 32 ... analog signal input section (input means), 33 ... manual input section (Operation means) 34... Determination processing section (determination means), 35... Count processing section (counting means), 36.

Claims (1)

A monitoring device for monitoring power receiving and distribution equipment having at least a circuit breaker, a protective relay, and a load current measuring means,
An input means for inputting an open / close state signal of the circuit breaker, an operation signal of the protective relay and a measured value of the load current measuring means,
An operation means for outputting a maintenance in-progress signal indicating that maintenance is being performed by an operator operating when the breaker is under maintenance;
Based on the open / close state signal of the circuit breaker inputted by the input means, the operation signal of the protective relay and the measured value of the load current measuring means, and the output of the in- maintenance signal from the operating means , the breaker Determination means for determining at least accident interruption, load interruption, no-load interruption,
A counting means for counting the number of breaks of the circuit breaker for each type of accident interruption, load interruption, no-load interruption determined by the determination means;
A monitoring device comprising:

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