JP6162661B2 - Breaking current analyzer, breaking current analysis system - Google Patents

Description

  The present invention relates to an apparatus and system for analyzing a breaking current that flows when a breaker operates.

  In the power system, a circuit breaker is installed as a switchgear. This circuit breaker operates in the event of a system failure, etc., thereby stopping the energization of a specific section to protect the system from abnormal currents and ensuring a section where safe power transmission is possible to stabilize the customer It is installed for the purpose of maintaining an efficient power supply.

  FIG. 5 is a schematic diagram illustrating an example of a circuit breaker. FIG. 5A shows the first half state of the breaking process in the circuit breaker, and FIG. 5B shows the second half state of the breaking process.

Breaker shown in FIG. 5 50, for example, SF arc-extinguishing gas-filled tank ₆ and the like (not shown) in a movable main contact 51 and the movable arc contact 52, fixed main contact 53 and the fixed The arc contact 54 is disposed opposite to the arc contact 54. A nozzle 56 fixed to a buffer cylinder 55 provided on the movable side (the right side in the drawing) is provided on the outer periphery of the movable arc contact 52 and the fixed arc contact 54.

  An operation rod 57 is attached to the movable side. The operation rod 57 is connected to an operation mechanism (not shown) together with the buffer cylinder 55, and can be operated by control from the operation mechanism. A space (buffer chamber 58) is formed by the buffer cylinder 55 and the operating rod 57. In addition, a hollow portion 59 and a communication hole 61 are provided in the vicinity of the connection portion between the movable arc contact 52 and the operation rod 57.

  In the circuit breaker 50, the movable part moves to the right in the drawing by an operation from an operation mechanism based on a predetermined control signal. Here, the movable portion refers to a member group including the movable main contact 51, the movable arc contact 52, the buffer cylinder 55, the nozzle 56, and the operation rod 57.

  When the movable portion starts to move to the right in the drawing, first, as shown in FIG. 5A, the arc 70 is ignited between the fixed arc contact 54 and the movable arc contact 52 in the first half of the interruption process. Since the arc 70 has a high temperature, a high-temperature gas is generated from the arc 70, and the heated arc extinguishing gas also has a high temperature. The generated high-temperature gas flows into the buffer chamber 58 through the space between the nozzle 56 and the movable arc contact 52 and through the communication hole 61 after passing through the hollow portion 59. The pressure in the buffer chamber 58 is increased by the hot gas that has flowed in.

  Thereafter, in the latter half of the interruption process as shown in FIG. 5B, the arc 70 becomes smaller toward the current zero point, and the insulating gas is blown to the arc 70 from the buffer chamber 58 that has become high pressure, and the arc is extinguished. Current interruption is completed.

  As described above, when the interruption operation is performed, an arc is generated between the fixed arc contact 54 and the movable arc contact 52. The generated arc is extinguished by the insulating gas in a short time, but is at a high temperature, so that the constituent materials of both the contacts (52, 54) are dissolved or evaporated and consumed. As a result, if the breaking operation of the circuit breaker 50 is repeated a plurality of times (for example, several tens of times) or more, the wear of both the contacts (52, 54) may progress, and the function may not be fully exhibited.

  For this reason, it is necessary to periodically check the degree of wear of the movable arc contact 52 and the fixed arc contact 54. Normally, this inspection is visually inspected by maintenance workers. However, since the circuit breaker 50 is covered with a cover and the inside cannot be visually inspected from the outside, it is necessary for the worker to open the cover and check the inside. Therefore, a power outage is required when performing such inspection work. In particular, a large number of circuit breakers are installed in electrical stations such as substations, and when performing inspections in this way, a large amount of labor is required, such as the need for a power outage plan.

  Because of the above circumstances, from the viewpoint of efficiently performing the internal inspection of the circuit breaker, manage the value of the cumulative breaking amount calculated from the magnitude of the current (breaking current) when breaking and the number of breakings, When this value exceeds a predetermined value, it is common to perform an internal inspection of the circuit breaker. When managing each circuit breaker by this method, it is necessary to measure the magnitude of the circuit breaker for each circuit breaker.

  For example, Patent Document 1 listed below describes a technique related to a method for measuring a breaker breaker current.

JP 2011-030301 A

  Starting with the above-mentioned Patent Document 1, an apparatus that simply measures and analyzes the breaking current of one breaker has been developed.

  By the way, a plurality of circuit breakers are installed particularly in an electric station such as a substation. In such a facility, it has been proposed to manage the value of the cumulative breaking amount by attaching a device for measuring the breaking current for each breaker. However, this method requires an extremely large number of devices, and the number of operations for installing the devices becomes enormous. While the above method is suitable for use in breaking current analysis to manage the cumulative breaking value of a specific breaker, the cumulative breaking of each breaker in a facility with multiple or multiple breakers It is not necessarily the optimum method for managing the quantity value.

  An object of this invention is to provide the apparatus and system which can analyze the interruption | blocking current of a several circuit breaker collectively by simple structure in view of said subject.

The breaking current analyzer of the present invention is
A plurality of first input units for receiving inputs of a plurality of first signals corresponding to currents flowing through a plurality of electric lines with different systems;
A plurality of second input units for receiving inputs of a plurality of second signals corresponding to a plurality of cutoff signals for operating a plurality of circuit breakers provided in each of the plurality of electric lines;
The plurality of first signals are input from the plurality of first input sections, and the data conversion section to which the plurality of second signals are input from the plurality of second input sections are output from the data conversion section. An arithmetic processing unit to which data is input,
When the level of at least one of the plurality of second signals satisfies a predetermined condition among the plurality of second signals, the data conversion unit has a data amount for the plurality of first signals and the plurality of second signals. Output converted data generated by performing data conversion for reduction to the arithmetic processing unit,
The arithmetic processing unit specifies a target circuit breaker that has been operated from among the plurality of circuit breakers based on the converted data, and calculates a breaking current that has flowed through the target circuit breaker.

  The breaking current analyzing apparatus of the present invention includes a plurality of first input units that receive inputs of a plurality of first signals, and a plurality of second input units that receive inputs of a plurality of second signals. Here, as described above, the first signal is a signal corresponding to the current flowing through the electric line, and the second signal is a signal corresponding to the cutoff signal.

  That is, the breaking current analyzer of the present invention operates a signal (first signal) relating to currents flowing through a plurality of electric lines belonging to different systems and a plurality of circuit breakers provided in the plurality of electric lines belonging to different systems. For this purpose, a blocking signal (second signal) is input in a lump. More specifically, these pieces of information are input to a data converter included in the breaking current analyzer.

  For example, a signal corresponding to the amount of current flowing through the electric line and a signal corresponding to the level of the breaking signal (the amount of current flowing through the breaking signal line) via the secondary side wiring of the current transformer (CT) It is possible to adopt a configuration in which the input is made. In this case, these signals are always inputted into the apparatus as analog values, and the amount of information becomes enormous.

  The breaking current is a current that flows when the breaker breaks, and this device is intended to analyze this current. The circuit breaker is installed in, for example, a substation, but the circuit breaker is interrupted only in exceptional cases such as during an accident or inspection. The purpose of this device is to analyze the breaking current flowing through the circuit breaker at the time of “breaking” as an exceptional situation. In other words, the information on the current flowing through the electric line and the control signal (breaking signal) given to the circuit breaker under normal operation (non-breaking and conducting) are compared with those flowing when breaking It only needs to be available as a target. In other words, when analyzing the breaking current, it is only necessary to have the data at the timing immediately before the breaking with respect to the amount of current flowing through the electric line and the level of the breaking signal. It is not always necessary for analysis.

  However, it is not possible to know in advance the timing at which the circuit breaker breaks due to an accident, so a configuration is adopted in which both the first signal and the second signal are input into the device for the purpose of recognizing this timing on the device side. ing. Therefore, in the time zone when the shut-off operation does not occur, it is not necessary to output the information indicated by these signals to the arithmetic processing unit because it is not always necessary to use the information for the arithmetic operation. On the contrary, when it is configured to output all information to the arithmetic processing unit, the amount of data becomes extremely large and the time required for data conversion increases significantly. As a result, the timing at which both signals are input to the data conversion unit and the data The time lag between the timing at which data is transferred from the conversion unit to the arithmetic processing unit is increased. Further, it is necessary to provide a storage unit having an extremely large storage capacity in the arithmetic processing unit, and there is a disadvantage that the apparatus scale becomes large.

  Therefore, in the apparatus of the present invention, when the level of at least one second signal satisfies a predetermined condition in the data converter, converted data generated by performing data conversion on the first signal and the second signal Is output to the arithmetic processing unit. The second signal is a signal corresponding to the interruption signal, but the circuit breaker is configured to operate based on the interruption signal. For example, the interruption operation is performed when the level of the interruption signal exceeds a predetermined level. Therefore, by confirming the change mode of the level of the second signal, it is possible to recognize that at least one of the plurality of circuit breakers to be analyzed by the circuit breaker current analysis device of the present invention has broken. it can. That is, according to this configuration, the converted data is output to the arithmetic processing unit according to the timing at which at least one circuit breaker is shut off, and therefore it is not necessary to output a huge amount of data to the arithmetic processing unit. Therefore, a large-capacity storage unit is not required in the arithmetic processing unit, and there is almost no time lag between the timing at which the circuit breaker operates and the timing at which the converted data is transferred to the arithmetic processing unit.

  When the converted data is sent from the data converter, the arithmetic processor specifies the target circuit breaker based on this data. As an example of a specific method, the arithmetic processing unit analyzes converted data generated by performing data conversion on a plurality of second signals, and the level exceeds a predetermined value. Identify two signals. The arithmetic processing unit identifies the system including the circuit breaker to which the identified second signal is input, and the data conversion is performed on the change in the current flowing through the electric wire belonging to the system. Analyzed from the converted data generated by the application. As a more specific example, a waveform corresponding to the current flowing through the electric line is reproduced from the converted data, and the amount of current is calculated based on this waveform. This calculated amount of current corresponds to the breaking current.

  As described above, according to the breaking current analyzing apparatus of the present invention, it becomes possible to analyze breaking currents of a plurality of circuit breakers provided in a plurality of systems by one apparatus.

In addition to the above configuration,
The data conversion unit includes a first unit and a second unit,
The second unit is configured to receive the plurality of second signals from the plurality of second input units, and when the level of at least one second signal exceeds a predetermined threshold, the trigger signal is sent to the second unit. Output to one unit,
The first unit receives the plurality of first signals from the plurality of first input units, and receives the plurality of second signals from the plurality of second input units or from the second unit. The configuration may be such that when the trigger signal is input, the converted data is output to the arithmetic processing unit.

  According to the above configuration, the second unit is configured to receive a plurality of second signals without inputting a plurality of first signals, and to detect that the circuit breaker has operated (timing). Corresponds to the unit provided. That is, when the level of at least one second signal exceeds a predetermined threshold, this second unit indicates that at least one of the circuit breakers provided in the plurality of systems has been interrupted. recognize. Then, the second unit outputs a trigger signal to the first unit at this timing. Upon receiving this trigger signal, the first unit outputs the converted data to the arithmetic processing unit.

  Under this configuration, the second unit included in the data conversion unit is a unit for detecting the timing when the circuit breaker operates, and performs data conversion on the plurality of first signals and the plurality of second signals. It is a unit different from the unit (first unit) that generates converted data. In order to realize a function of detecting a change in the level of at least one of the plurality of second signals in a configuration in which a plurality of first signals and a plurality of second signals are input, an extremely high performance apparatus Will be required and the cost will rise. According to this configuration, the second unit monitors the levels of all the input signals because all the input signals are the second signals, and triggers when one of the signals indicates a level exceeding the threshold. What is necessary is just the structure which outputs a signal, and it can implement | achieve with a very simple structure.

  In particular, the present invention aims to make it possible to analyze the breaking currents of a plurality of breakers with a single device. In this background, a device for measuring breaking currents is attached to each breaker. There are circumstances such as complexity and high cost. According to this configuration, it is possible to analyze the breaking currents of a plurality of breakers at a lower cost.

  Here, the arithmetic processing unit reproduces a waveform corresponding to a current flowing through the electric wire provided with the target circuit breaker from the converted data, and flows to the target circuit breaker based on the waveform. It is also possible to calculate the breaking current.

In addition to the above configuration,
A storage unit for storing information on the rated breaking current of each of the plurality of circuit breakers, and information on the degree of wear indicating the degree of wear of each of the plurality of circuit breakers at the immediately preceding time point;
When the arithmetic processing unit calculates the breaking current flowing through the target circuit breaker, the value of the rated breaking current of the target circuit breaker read from the storage unit and the value of the degree of wear of the target circuit breaker at the immediately preceding time point In addition, by calculating according to a predetermined arithmetic expression using the calculated value of the breaking current, the current degree of wear of the target circuit breaker is calculated, and the information on the degree of wear is updated in the storage unit I do not care.

  According to the said structure, the wear degree of each of the some circuit breaker provided in the different system | strain used as this object can be managed by this apparatus.

  Here, the arithmetic processing unit may output a warning signal when the current degree of wear of the target circuit breaker exceeds a predetermined threshold.

  According to this configuration, it is possible to appropriately notify the replacement or inspection time of each of the plurality of circuit breakers.

The breaking current analysis system of the present invention is
A breaking current analyzer having the above-described configuration;
A plurality of first auxiliary current transformers installed on a wiring connecting between a secondary side of a current transformer provided in the plurality of electric lines and a plurality of relay panels corresponding to the plurality of electric lines, respectively. When,
A plurality of second auxiliary current transformers installed on the wiring for outputting the interruption signal to the plurality of circuit breakers corresponding to each of the plurality of relay boards from the plurality of relay boards; ,
Secondary sides of the plurality of first auxiliary current transformers are connected to the plurality of first input parts,
The secondary side of the plurality of second auxiliary current transformers is connected to the plurality of second input portions.

  ADVANTAGE OF THE INVENTION According to this invention, the apparatus and system which can analyze the interruption | blocking current of a some circuit breaker collectively by simple structure are implement | achieved.

It is a conceptual diagram which shows the whole system containing a breaking current analyzer. It is a figure which shows typically the relationship between the interruption | blocking signal and the electric current which flows through an electric wire. It is a conceptual diagram which shows another embodiment of the whole system containing a breaking current analyzer. It is a conceptual diagram which shows another embodiment of the whole system containing a breaking current analyzer. It is a schematic diagram which shows an example of a circuit breaker.

  FIG. 1 is a conceptual diagram showing the entire system including a breaking current analyzer of the present invention. In the present embodiment, this breaking current analyzer is used by being disposed in an area having a function of controlling a circuit breaker in an electric station such as a substation (sometimes referred to as “switchboard room”). Is assumed.

  FIG. 1 shows a system 20 including an A-phase electric line 20A, a B-phase electric line 20B, and a C-phase electric line 20C, an A-phase electric line 30A, a B-phase electric line 30B, and a C-phase electric line. A system 30 including an electric line 30C is shown. In FIG. 1, only two systems of the system 20 and the system 30 are illustrated, but there may be three or more electric lines.

  The system 20 is provided with a circuit breaker 23, and the system 30 is provided with a circuit breaker 33. The circuit breaker 23 is controlled in operation by a control signal (hereinafter referred to as “breaking signal”) input from the relay panel 26 provided in the switchboard room 40 through the control line 22T. More specifically, when it is desired to shut off the circuit breaker 23, a break signal having a level exceeding a predetermined threshold is output from the relay panel 26 to the circuit breaker 23 through the control line 22T. When the breaker 23 recognizes that the level of the breaking signal input through the control line 22T exceeds the threshold value, the breaking circuit 23 performs a breaking operation. At this time, the electric lines 20A, 20B, and 20C belonging to the system 20 are opened between the primary side and the secondary side of the circuit breaker 23.

  Similarly, the circuit breaker 33 is controlled in operation by a cut-off signal input from the relay board 36 provided in the switchboard room 40 through the control line 32T. More specifically, when it is desired to shut off the circuit breaker 33, a break signal having a level exceeding a predetermined threshold is output from the relay panel 36 to the circuit breaker 33 through the control line 32T. When the breaker 33 recognizes that the level of the cutoff signal input through the control line 32T exceeds the threshold value, the breaker 33 performs a cutoff operation. At this time, the electric lines 30A, 30B and 30C belonging to the system 30 are opened between the primary side and the secondary side of the circuit breaker 33.

  The “relay panel 26” and the “relay panel 36” may be referred to by other names such as a protection relay device, but are not limited to the names as long as they have similar functions.

  In the relay panel 26, wiring 22A connected to the secondary side of the current transformer 21A provided in the electric line 20A, wiring 22B connected to the secondary side of the current transformer 21B provided in the electric line 20B, And the wiring 22C connected to the secondary side of the current transformer 21C provided in the electric line 20C is connected. Similarly, the relay panel 36 is connected to the secondary side of the current transformer 31B provided to the secondary side of the current transformer 31A provided in the electric line 30A and the current 32A provided to the electric line 30B. Wiring 32B connected to the secondary side of current transformer 31C provided in wiring 32B and electric wire way 30C is connected.

  The relay panel 26 has a function of monitoring the current flowing through the system 20, more specifically, the electric line (20A, 20B, 20C) by monitoring the current flowing through the wiring (22A, 22B, 22C). . Then, the relay panel 26 determines that the current flowing through at least one phase of the electric lines (20A, 20B, 20C) of each phase constituting the system 20 deviates from a predetermined reference value. Then, a control signal (blocking signal) having a level exceeding a predetermined threshold is output through the control line 22T. At this time, as described above, the circuit breaker 23 recognizes that the level of the interruption signal input through the control line 22T exceeds the threshold value, and executes the interruption operation.

  Similarly, the relay panel 36 has a function of monitoring the current flowing through the system 30, more specifically, the current flowing through the electric lines (30A, 30B, 30C) by monitoring the current flowing through the wires (32A, 32B, 32C). doing. Then, the relay panel 36 determines that the current flowing through at least one phase of the electric lines (30A, 30B, 30C) of each phase constituting the system 30 deviates from a predetermined reference value. Then, a cutoff signal having a level exceeding a predetermined threshold is output through the control line 32T. The circuit breaker 33 recognizes that the level of the interruption signal input through the control line 32T is higher than the threshold value, and executes the interruption operation.

  Thereby, when an abnormal situation such as a short circuit accident or a ground fault occurs, the accident section can be specified.

  As shown in FIG. 1, a current transformer 25A is provided in the wiring 22A, and a wiring 27A connected to the secondary side of the current transformer 25A is connected to the first input unit 11 of the breaking current analyzer 1. It is connected. The wiring 22B is provided with a current transformer 25B, and the wiring 27B connected to the secondary side of the current transformer 25B is connected to the first input unit 11 of the breaking current analyzer 1. The wiring 22C is provided with a current transformer 25C, and the wiring 27C connected to the secondary side of the current transformer 25C is connected to the first input unit 11 of the breaking current analyzer 1. The current transformers (25A, 25B, 25C) are hereinafter referred to as “first auxiliary current transformers”.

  Similarly, the wiring 32A is provided with a first auxiliary current transformer 35A, the wiring 32B is provided with a first auxiliary current transformer 35B, and the wiring 32C is provided with a first auxiliary current transformer 35C. It has been. The wiring 37A connected to the secondary side of the first auxiliary current transformer 35A, the wiring 37B connected to the secondary side of the first auxiliary current transformer 35B, and the secondary side of the first auxiliary current transformer 35C The connected wiring 37 </ b> C is connected to the first input unit 11 of the breaking current analyzer 1.

  The control line 22T is provided with a current transformer 25T, and a wiring 27T connected to the secondary side of the current transformer 25T is connected to the second input unit 12 of the breaking current analyzer 1. . Similarly, the control line 32T is provided with a current transformer 35T, and the wiring 37T connected to the secondary side of the current transformer 35T is connected to the second input unit 12 of the breaking current analyzer 1. Yes. The current transformer (25T, 35T) is hereinafter referred to as a “second auxiliary current transformer”.

  Although only the system 20 and the system 30 are illustrated in FIG. 1, the same configuration can be adopted even when other systems including a circuit breaker to be analyzed exist. That is, the secondary side of the first auxiliary current transformer provided in the wiring connected to the secondary side of the current transformer provided in the electric wire of each phase is connected to the first input unit 11 of the breaking current analyzer 1. It can be set as the structure by which the secondary side of the 2nd auxiliary current transformer connected and provided in the control line of each circuit breaker is connected to the 2nd input part 12 of the circuit breaker current analyzer 1.

  As shown in FIG. 1, the breaking current analyzer 1 includes a first input unit 11, a second input unit 12, a data conversion unit 2, and an arithmetic processing unit 3. In the present embodiment, the data conversion unit 2 includes a first unit 4 and a second unit 5.

  As above-mentioned, the 1st input part 11 is the structure to which the secondary side wiring of a 1st auxiliary current transformer (25A, 25B, 25C, ...) is connected, and each system (20, 30, ...) A signal corresponding to the current flowing through the electric wire (hereinafter referred to as “first signal” as appropriate) is input. Moreover, the 2nd input part 12 is the structure to which the secondary side wiring of a 2nd auxiliary current transformer (25T, 35T, ...) is connected, and the analysis provided in each system | strain (20, 30, ...). A signal (hereinafter, referred to as “second signal” as appropriate) corresponding to the interruption signal given to the target circuit breaker (23, 33,...) Is input.

  In the present embodiment, the first signal input through the first input unit 11 is input to the first unit 4 of the data conversion unit 2. Further, the second signal input through the second input unit 12 is input to the second unit 5 of the data conversion unit 2. In the present embodiment, the second signal is output from the second unit 5 to the first unit 4.

  The second unit 5 is configured to output to the first unit 4 when the level of at least one signal among the plurality of second signals that are the cutoff signals of the respective circuit breakers of the target system satisfies a predetermined condition. More specifically, the second unit 5 sends the trigger signal to the first unit when the level of at least one signal out of a plurality of second signals that are the breaking signals of the circuit breakers of the target system exceeds a predetermined threshold value. 4 can be used.

  As described above, each of the circuit breakers (23, 33,...) Is configured to execute a breaking operation when the level of the breaking signal exceeds a predetermined threshold. For this reason, in the second unit 5, it is monitored whether the level of at least one of the second signals exceeds a predetermined threshold, and at least one of the second signals exceeds the predetermined threshold. If confirmed, it is detected that the circuit breaker (23, 33,...) Belonging to at least one of the plurality of systems (20, 30,. can do.

  As shown in FIG. 1, the second signal is a signal that is input through the secondary side wiring of the second auxiliary current transformer (25T, 35T,...), And this is the control line (22T, 32T, ...) is a signal corresponding to the interruption signal input to each breaker (23, 33, ...). That is, the second signal input to the second unit 5 is a signal based on a signal given when the breaker control is performed on each breaker from the relay panel (26, 36,...). Therefore, the second unit 5 can detect the state immediately before each circuit breaker actually performs the breaking operation.

  The first unit 4 receives a first signal that is a signal corresponding to a current flowing through the electric line of each system (20, 30,...) Through the first input unit 11. Further, in the present embodiment, the first unit 4 also receives a second signal, which is a signal based on a signal given when executing breakage control for each breaker through the second unit 5.

  Here, when a trigger signal is given from the second unit 5, the first unit 4 receives data (digital data) obtained by performing data conversion for reducing the data amount on the first signal and the second signal. Generate. Hereinafter, this digital data is referred to as “converted data” as appropriate. The purpose of this data conversion is to convert the data into a data format that can be subjected to arithmetic processing in the arithmetic processing unit 3 constituted by a microcomputer, a CPU, and the like.

  The arithmetic processing unit 3 performs a process of identifying the target circuit breaker that has been operated from among the plurality of circuit breakers (23, 33,...) Based on the input converted data. Specifically, first, the converted data corresponding to the second signal is analyzed to identify a system in which the level of the cutoff signal is greatly changed (first process). Next, the electric line belonging to this system is specified, the converted data corresponding to the first signal related to the specified electric line is analyzed, and the breaking current is calculated (second processing).

  Here, as an example of a specific execution method of the first process, each digitized second signal is converted into waveform data, and then the level of the converted waveform is analyzed to thereby control each control line. A method of specifying a system in which the level of the cutoff signal flowing through (22T, 32T,...) Exceeds a predetermined threshold can be employed. In addition, as an example of a specific execution method of the second process, each first signal corresponding to the electrical line belonging to the specified system is converted into waveform data, and then the level of the converted waveform is A method of reading the current flowing through the electric wire at the time can be adopted.

  FIG. 2 is a diagram schematically showing the relationship between the interruption signal and the current flowing through the electric line. (A) corresponds to a drawing in a state in which the circuit breaker is not performing a breaking operation (normal state), and (b) corresponds to a drawing in a state in which the circuit breaker is performing a breaking operation. As shown in FIG. 2 (a), when the circuit breaker is not operating, the level of the interruption signal input to the circuit breaker is below a predetermined threshold value y, and the system including the circuit breaker is included. The current flowing through the electric wire line belonging to 1 shows a sinusoidal waveform having a substantially constant peak value. On the other hand, as shown in FIG. 2 (b), under the state in which the circuit breaker is operated, the level of the interruption signal rises from a timing slightly before the operation point, and then the interruption operation is completed. During this period, the peak value of the current waveform flowing through the electric line changes from the normal time.

  Here, no interrupt signal is output at all when the circuit breaker is not operating, and a predetermined level of interrupt signal may be output when the circuit breaker is operating. As another aspect, a low level breaking signal may be output when the circuit breaker is not operating, and a high level breaking signal may be output when the circuit breaker is operating. Any configuration can be used as long as the circuit breaker can recognize whether the circuit breaker is in an operating state or a non-operating state depending on the level of the breaking signal.

  The arithmetic processing unit 3 generates the waveform data as shown in FIG. 2B from the converted data, and calculates the breaking current by reading the change in the peak value of the current waveform after the breaking instruction is started. be able to.

  In the present embodiment, the present system is configured to include a display unit 6 for displaying a result calculated by the arithmetic processing unit 3 and an external storage unit 7 for storing the result. The display unit 6 is configured by, for example, a monitor, and the external storage unit 7 can be configured by, for example, a hard disk of an external computer, an external storage medium, or a server. The operator can visually check the result of the arithmetic processing unit 3 by checking the display unit 6, and can read the data from the external storage unit 7 to read the circuit breakers (23, 33, ...) can confirm the information of the breaking current when the breaking operation is performed.

  The arithmetic processing unit 3 can include a storage unit therein. At this time, the storage unit stores information on the breaking current when each breaker (23, 33,...) Arranged in each system (20, 30,...) To be analyzed has been operated in the past. It does not matter if it is And when it is judged that the circuit breaker (23, 33, ...) newly operate | moved, it can be set as the structure which memorize | stores the information of this interruption current in the said memory | storage part.

  By the way, according to the “Gas Insulated Switchgear Specification / Maintenance Criteria” published by the Electric Joint Research Institute, the circuit breaker wear rate is defined by the following equation (1). It is preferred to determine when to check / replace the instrument.

  In the above formula 1, “rated breaking current” is a numerical value unique to each breaker (23, 33,...). The breaking current is a current value that would have flown through the breaker during the breaking operation as described above. If the degree of wear of the circuit breaker exceeds a predetermined value (for example, 100%) under Equation 1, it can be determined that the circuit breaker is inspected or replaced.

  The storage unit built in the arithmetic processing unit 3 stores the value of the degree of wear at the present time of each circuit breaker (23, 33,...) As an analysis target. When a breaking operation occurs for a specific circuit breaker, the value of the degree of wear immediately before the circuit breaker is read, and the latest degree of wear is calculated from the above equation 1 based on the value of the breaking current calculated this time. Is calculated. Then, the calculated value of the degree of wear is updated in the storage unit as the latest degree of wear in this circuit breaker. At this time, the arithmetic processing unit 3 may update the latest wear level value to the external storage unit 7 or display it on the display unit 6.

  Further, the arithmetic processing unit 3 performs control to output a warning signal to the display unit 6 when the latest calculated degree of wear exceeds a predetermined value (100% in the above example). It doesn't matter. Thereby, the appropriate inspection or replacement time of each circuit breaker can be notified. Further, a similar signal may be output to the external storage unit 7. When the external storage unit 7 is a hard disk of a server or computer at a remote location, it is possible to notify an appropriate inspection or replacement time of the circuit breaker to the remote location via a communication line.

  As described above, the first signal is a signal input through the secondary side wiring of the first auxiliary current transformer (25A, 25B, 25C,...), And the second signal is the second auxiliary current transformer (25T, 35T,...)), And these signals are analog signals. That is, the first unit 4 is configured such that these analog signals are constantly input.

  As described above in the section “Problem to Solve the Invention”, the breaking current analyzer 1 analyzes the “breaking current” that is the current that flows when the breaker (23, 33,...) Breaks. It is aimed. Since the circuit breaker operates only in exceptional cases such as during an accident or inspection, it is sufficient that data at the timing immediately before the circuit breaks exists, and information at other times is used to analyze the circuit breaker current. Is not necessarily required.

  When the input analog signal is always converted into digital data and output, the amount of data becomes extremely large, and the time required for data conversion is extremely increased. For this reason, the time lag between the timing at which the first signal and the second signal are input and the timing at which data is transferred from the data conversion unit 2 to the arithmetic processing unit 3 is increased. In addition, the arithmetic processing unit 3 needs to be provided with a storage unit having an extremely large storage capacity, resulting in an adverse effect that the apparatus scale becomes large.

  In the case of the interrupting current analyzer 1 of the present invention, when the level of at least one second signal exceeds a predetermined threshold, the data conversion unit 2 (“first unit 4” in this embodiment) performs data on the analog signal. The converted data generated by the conversion is output to the arithmetic processing unit 3. As a result, the storage capacity of the storage unit required in the arithmetic processing unit 3 can be greatly reduced and the occurrence of time lag can be suppressed.

  According to the above configuration, when at least one of the plurality of circuit breakers (23, 33,...) Operates, the fact is detected and the system in which the circuit breaker is arranged is specified. The breaking current that flows through the electric line of the system is calculated. And this interruption | blocking current analyzer 1 makes 1st auxiliary change to the wiring (22A, 22B, 22C, ...) connected to each relay panel (26,36, ...) and the control line (22T, 32T, ...). The above-described function is realized by connecting the secondary-side wiring via the current transformer (25A, 25B, 25C,...) And the second auxiliary current transformer (25T, 35T,...). In the switchboard room 40, since the relay boards (26, 36,...) Are collectively arranged, control lines for controlling a plurality of target circuit breakers (23, 33,...) Usually, the wiring for detecting the current flowing through the electric wire included in the system to which each circuit breaker belongs is collected. For this reason, the wiring for connecting to each input part (11, 12) of the breaking current analyzer 1 is very easy.

  That is, according to the breaking current analyzing apparatus 1, it becomes possible to manage and analyze the breaking currents of a plurality of breakers at once by an extremely simple installation.

  In the present embodiment, the data conversion unit 2 includes the first unit 4 and the second unit 5. That is, in the present embodiment, the second unit 5 is a unit for detecting the timing at which the circuit breakers (23, 33,...) Are operated, and performs data conversion for the plurality of first signals and the plurality of second signals. Is a unit different from the first unit 4 that generates converted data by applying In order to realize a function of detecting a change in the level of at least one of the plurality of second signals in a configuration in which a plurality of first signals and a plurality of second signals are input, an extremely high performance apparatus Will be required and the cost will rise.

  According to the configuration of the present embodiment, since all the signals input to the second unit 5 are second signals, the second unit 5 monitors the levels of all the signals input, and one of them is monitored. The trigger signal may be output when the signal indicates a level exceeding the threshold. For this reason, the structure of a unit can be simplified and it can implement | achieve with a comparatively cheap apparatus.

  However, as shown in FIG. 3, the data conversion unit 2 may be configured by a single unit that receives all the first signals and the second signals. In this case, the data conversion unit 2 first monitors only a plurality of second signals among all input signals, and detects that the level of at least one second signal exceeds a predetermined threshold value. The converted data obtained by performing the data conversion on the first signal and the second signal may be output to the arithmetic processing unit 3.

[Another embodiment]
Hereinafter, another embodiment will be described.

  <1> In the embodiment shown in FIG. 1, the first unit 4 receives a plurality of first signals from the first input unit 11 and a plurality of second signals via the second unit 5. It was supposed to be a configuration. However, as shown in FIG. 4, a plurality of second signals input through the second input unit 12 may be input to the second unit 5 and the first unit 4 in parallel.

  <2> In the above-described embodiment, the breaking current analyzer 1 has been described on the assumption that the breaking current analyzer 1 is installed in the switchboard room 40 of the substation. However, this description is merely an example, and the breaking current analyzer is described. It is not intended to limit the installation position of 1.

  <3> In the above-described embodiment, the case where the wear degree is calculated based on Equation 1 has been described as an example. However, the wear degree may be calculated using the value of the breaking current as a method for calculating the wear degree. It is not necessarily limited to the method of Formula 1.

1: Breaking current analyzer
2: Data converter
3: Arithmetic processing unit
11: First input section
20: System
20A, 20B, 20C: Electric wire
21A, 21B, 21C: Current transformer
22A, 22B, 22C: Wiring
22T: Control line
23: Circuit breaker
25A, 25B, 25C: First auxiliary current transformer
25T: Second auxiliary current transformer
26: Relay panel
27A, 27B, 27C: Wiring
30: System
30A, 30B, 30C: Electric line
31A, 31B, 31C: Current transformer
32A, 32B, 32C: Distribution wiring
32T: Control line
33: Circuit breaker
35A, 35B, 35C: First auxiliary current transformer
35T: Second auxiliary current transformer
36: Relay panel
37A, 37B, 37C: Wiring
40: Switchboard room
50: Circuit breaker
51: Movable main contact
52: Moving arc contact
53: Fixed main contact
54: Fixed arc contact
55: Buffer cylinder
56: Nozzle
57: Operation rod
58: Buffer room
59: hollow part
61: Communication hole
70: Arc

Claims (6)

A plurality of first input units for receiving inputs of a plurality of first signals corresponding to currents flowing through a plurality of electric lines with different systems;
A plurality of second input units for receiving inputs of a plurality of second signals corresponding to a plurality of cutoff signals for operating a plurality of circuit breakers provided in each of the plurality of electric lines;
The plurality of first signals are input from the plurality of first input sections, and the data conversion section to which the plurality of second signals are input from the plurality of second input sections are output from the data conversion section. An arithmetic processing unit to which data is input,
When the level of at least one of the plurality of second signals satisfies a predetermined condition among the plurality of second signals, the data conversion unit has a data amount for the plurality of first signals and the plurality of second signals. Output converted data generated by performing data conversion for reduction to the arithmetic processing unit,
The arithmetic processing unit specifies a target circuit breaker that has been operated from among the plurality of circuit breakers based on the converted data, and calculates a circuit breaker current that flows through the target circuit breaker. Current analyzer. The data conversion unit includes a first unit and a second unit,
The second unit is configured to receive the plurality of second signals from the plurality of second input units, and when the level of at least one second signal exceeds a predetermined threshold, the trigger signal is sent to the second unit. Output to one unit,
The first unit receives the plurality of first signals from the plurality of first input units, and receives the plurality of second signals from the plurality of second input units or from the second unit. 2. The breaking current analyzer according to claim 1, wherein when the trigger signal is input, the converted data is output to the arithmetic processing unit.   The arithmetic processing unit reproduces, from the converted data, a waveform corresponding to a current flowing through the electric wire provided with the target circuit breaker, and based on the waveform, the breaking current flowing through the target circuit breaker. The breaking current analyzer according to claim 1, wherein the breaking current analyzer is calculated. A storage unit for storing information on the rated breaking current of each of the plurality of circuit breakers, and information on the degree of wear indicating the degree of wear of each of the plurality of circuit breakers at the immediately preceding time point;
When the arithmetic processing unit calculates the breaking current flowing through the target circuit breaker, the value of the rated breaking current of the target circuit breaker read from the storage unit and the value of the degree of wear of the target circuit breaker at the immediately preceding time point In addition, by calculating with a predetermined arithmetic expression using the calculated value of the breaking current, the current degree of wear of the target circuit breaker is calculated, and information on the degree of wear is updated in the storage unit. The breaking current analyzer according to any one of claims 1 to 3.   5. The breaking current analyzer according to claim 4, wherein the arithmetic processing unit outputs a warning signal when a current wear degree of the target breaker exceeds a predetermined threshold. Breaking current analyzer according to any one of claims 1 to 5,
A plurality of first auxiliary current transformers installed on a wiring connecting between a secondary side of a current transformer provided in the plurality of electric lines and a plurality of relay panels corresponding to the plurality of electric lines, respectively. When,
A plurality of second auxiliary current transformers installed on the wiring for outputting the interruption signal to the plurality of circuit breakers corresponding to each of the plurality of relay boards from the plurality of relay boards; ,
Secondary sides of the plurality of first auxiliary current transformers are connected to the plurality of first input parts,
The breaking current analysis system, wherein secondary sides of the plurality of second auxiliary current transformers are connected to the plurality of second input units.