JP4633692B2 - Switch with life management function - Google Patents

Description

  The present invention relates to a switch, and more particularly to a switch with a life management function capable of life management.

  Conventionally, power switches for outdoor installation, such as pole-mounted switches for automatic distribution line switching, have traditionally been used for statistical processing of the operation period (years) until failure occurs from the standpoint of ensuring the reliability of power supply. By (accident statistical processing), for example, a renewal encouragement life (guaranteed useful life) such as 20 years is defined as the life, and life management is performed using this life time as a guide. Based on this management, the switch was replaced or repaired. In other words, management based on changes in the electrical switching performance that is the original function of the switch has not been performed.

  By the way, in this type of switch, in order to prevent the entry of outside air into the switch and prevent rust and the like, a gas such as dry nitrogen gas is charged at about 13 kPa in terms of 20 ° C., for example. Maintained at a positive pressure above atmospheric pressure.

  However, when the switch is used (operated) for a long period of time, the appearance of the container is damaged, a component failure (malfunction) occurs, or the pressure inside the container decreases due to natural gas leakage or the like. When the pressure inside the container is reduced, intrusion of outside air (humidity) may cause malfunctions due to rusting in parts inside the container, leading to failure. In combination with such a deterioration situation and the situation described in the paragraph 0002, the life of the switch is not a loss of the function originally, but is often determined by accessories such as an outer box.

  In recent years, power switches are frequently opened and closed to reduce the load on each distribution line as much as possible in order to improve system operation in response to the spread of distributed power sources, improve distribution line utilization, and reduce distribution line loss. It is necessary to control evenly. At that time, the switching frequency of the switch in the conventional operation (for example, the service life of 20 years) was not a problem with the number of times the load current can be switched, whereas the switching frequency increased, as described above. It is expected that it will be impossible to open and close after a long service life.

For this reason, it is necessary to manage the lifetime of the switch with respect to the electrical switching performance, and conventionally, a device for predicting the lifetime of the contact of the switch has been proposed (Patent Document 1). That is, the device described in Patent Document 1 detects and accumulates the breaking current flowing through the switch, and predicts the lifetime from the accumulated value based on the correlation between the sum of the breaking current and the lifetime.
Japanese Patent Laid-Open No. 6-70445

  In the life prediction method described in Patent Document 1, for example, a cut-off current flowing in a switch is detected, and it is determined that the life is over when the accumulated value exceeds a preset set value. Become.

  By the way, the correlation between the breaking current based on the life of the contact of the switch and the number of breaks is generally expressed by the following equation 1, and in the life management of the contact of the switch by a simple cumulative value of the breaking current, The life based on the opening / closing operation of the switch cannot be managed accurately. In Equation 1, y is the number of interruptions (number of times that can be opened and closed), and x is the interruption current (opening and closing current).

  In particular, as described in Patent Document 1, conventionally, there is no switch provided with a medium that stores or rewrites an opening / closing history and is attached to the switch in an indivisible state. For this reason, there has been no conventional one that can consider both the switching current and the number of operations.

  In view of the above-described problems, the present invention provides a switch with a life management function capable of grasping deterioration of electrical performance without excess and deficiency and preventing a supply trouble caused by the malfunction of an opening / closing mechanism occurring due to exceeding the number of switching operations. provide.

A first switch with a life management function of the present invention is a switch that opens and closes a load current, and stores a relational expression between a measuring means for measuring a load current at the time of opening and closing and the number of times that can be opened and closed. Rewriting the storage means, the calculation means for converting the load current measured by the measurement means into the switching current stored in the storage means and obtaining the remaining number of times that can be opened and closed based on the relational expression, and rewriting the switching history A storage medium that can be configured to store the number of openable / closable times sequentially calculated by the calculating unit and storing the openable / closable number of remaining times as the open / close history. It is composed of an IC tag that can be read, and at least the IC tag is attached to the switch container and is inseparable from the switch container.

The IC tag is a minute wireless IC chip used for identifying an object. Various shapes such as a label type, a card type, a coin type, and a stick type can be adopted.

In the first switch with a life management function of the present invention, it is possible to store and rewrite the switching history in the storage medium. For this reason, the opening / closing history can be managed. In addition, the open / close history can be sequentially updated by rewriting, and the storage medium stores the latest information on open / close.

In the first switch with a life management function of the present invention, the load current at the time of switching can be measured by the measuring means, and the load current is converted into the equivalent switching current by the calculating means, It is possible to determine the remaining number of times that can be opened / closed based on the relational expression between In addition, the IC tag that is a storage medium can sequentially rewrite and store the remaining number of times that can be opened and closed calculated by the calculation means. The data of the IC tag can be read by reading means.

As described above, in this switch with a life management function, the IC tag stores the current remaining number of times that can be opened and closed (data), and the reading means can read the remaining number of times that can be opened and closed. For this reason, the administrator of the switch can grasp the remaining number of times that can be opened and closed based on the data read by the reading means.

The switch with life management function of the second aspect of the present invention is a switch that opens and closes a load current, and stores a relational expression between a measuring means for measuring the load current at the time of opening and closing and the number of times the switch can be opened and closed. Storage means; calculation means for converting the load current measured by the measurement means into the switching current stored in the storage means to determine the cumulative number of switching times based on the relational expression; storing and rewriting the switching history; and a is a storage medium, said storage medium, with the sequentially rewriting the computed accumulated opening times by said calculating means stores the cumulative number of switching operations as the on-off history, data can be read by the reading means And at least the IC tag is attached to the switch container and is inseparable from the switch container.

In the second switch with a life management function of the present invention, the load current at the time of opening and closing can be measured by the measuring means, and the calculation means converts the load current into an equivalent switching current, The cumulative number of opening and closing times based on the relational expression with the possible number of times can be obtained. Further, the cumulative number of opening / closing operations calculated by the calculating means can be sequentially rewritten and stored in an IC tag as a storage medium. The data of the IC tag can be read by reading means.

Thus, in this switch with a life management function, the IC tag stores the current cumulative switching frequency (data), and the cumulative switching frequency can be read by the reading means. For this reason, an administrator of the switch can grasp the cumulative number of times of opening and closing based on the data read by the reading unit.

The inseparable means that it is attached to the switch container and integrated with the switch container, and when the switch is transferred, it is transferred together with the container.

  According to the first switch with a life management function of the present invention, the switching history can be managed. For this reason, it is possible to prevent a supply trouble due to the inoperative operation of the opening / closing mechanism that occurs when the number of times of opening / closing is exceeded. In addition, the open / close history can be sequentially updated by rewriting, and the storage medium stores information on the latest open / close. Thereby, it is possible to improve the accuracy of management of the opening / closing history. By the way, in a distribution line automatic operation system that monitors and controls a distribution system that connects each section with a distribution line via a switch installed for each section of the distribution line, the system operator manually opens or closes it by remote operation. A desired distribution line section is switched to an adjacent distribution line by executing an on / off operation for selecting and opening or opening a device. In selection of a switch candidate to be switched as described above, it is possible to manage with higher accuracy and to extend the life of the switch as compared with a method of managing only by the sum of the breaking currents or the number of breaking times.

Further, according to the first life management function equipped switch of the present invention, an administrator or the like of the switch can be the data read by the reading means, to grasp the open count remaining. For this reason, it is possible to prevent a supply trouble due to the inoperative operation of the opening / closing mechanism that occurs when the number of times of opening / closing is exceeded. Moreover, the accuracy of the remaining number of detected opening / closing operations is high. In addition, by considering the remaining number of possible switching operations in selecting a switch candidate, it becomes possible to manage with higher accuracy compared to a method that manages only the sum of the breaking current or the number of breaking times, and prolongs the life of the switch. Is possible.

According to the switch with life management function of the second aspect of the present invention, a switch manager or the like can grasp the cumulative number of times of opening and closing by the data read by the reading means. For this reason, life management can be performed stably like the switch with life management function. That is, if the cumulative number of switching times is known, it can be determined whether or not the switch has reached the use limit, and subsequent switch management can be performed. For this reason, it is possible to prevent a supply trouble due to the inoperative operation of the opening / closing mechanism that occurs when the number of times of opening / closing is exceeded. In addition, the accuracy of the detected cumulative number of switching is high. In addition, by selecting the number of switch candidates to be switched, considering the cumulative number of switching times, it is possible to manage with higher accuracy compared to the method of managing only the sum of the breaking currents or the number of breaking times, and prolonging the life of the switching device. Can be realized.

  In a switch with a life management function, the storage medium can be made inseparable from the switch container. For this reason, when moving a switch, etc., it is possible to know the number of times the switch can be opened and closed, etc. before the transfer. Regardless of how many times the switch is moved, consistent management is possible throughout the life cycle of the switch. It becomes. As a result, the accuracy of management such as the number of times the switch can be opened and closed after the relocation is increased.

  An embodiment of a switch with a life management function according to the present invention will be described with reference to FIGS.

  FIG. 1 shows a switch with a life management function according to a first embodiment of the present invention. This switch with a life management function is, for example, a distribution line automatic division switch. Here, the division switch is for dividing a distribution line drawn from a substation into a plurality of sections.

  The switch 1 includes a switch container 2 and a vacuum valve 3 accommodated in the switch container 2, and the container is filled with dry nitrogen gas or the like. For example, the gas is filled at about 13 kPa in terms of 20 ° C., and is maintained in a positive pressure state at or above atmospheric pressure.

  The vacuum valve 3 includes a vacuum container 5, a pair of electrodes accommodated in the vacuum container 5, and terminals 6 and 7 connected to the electrodes via current-carrying coils. The distribution lines 10a, 10b, 10c, 10d, 10e, and 10f are connected to the terminals 6 and 7, respectively.

  As shown in FIG. 3, the life management function of the switch with a life management function includes a storage means 11 in which a relational expression between the switching current (cutoff current) and the number of times that can be opened and closed (number of cutoffs) is input. Measuring means 12 for detecting a load current that is opened / closed by the switch 1, calculating means 13 for calculating the remaining number of times that can be opened / closed based on a relational expression between the switching current and the number of times that can be opened / closed, and data calculated by the calculating means 13 Is stored. In this storage medium 14, data from the calculation means 13 can be sequentially rewritten by a writing means (rewriting means) 18.

  The service life depending on the number of times of opening and closing is determined by the load current value that is opened and closed and the number of times of opening and closing. For this reason, the relational expression between the switching current and the number of times that can be opened and closed is expressed by the following formula 1, where y is the number of times that the switching is possible and x is the number of times that the switching is possible.

  As shown in FIG. 1, the measuring unit 12 can be configured by a current sensor 8 and a current calculation unit (current measurement unit) 9 that calculates a current from the current sensor 8. As the current sensor 8, a current transformer having an iron core and a coil wound around the iron core can be used. In addition, the current measurement unit 9, the storage unit 11, and the calculation unit 13 can be configured by a microcomputer or the like.

The storage medium 14 can be configured with an IC tag as shown in FIG. Here, the IC tag is a minute wireless IC chip used for identifying an object. Shape, label type, card type, coin type, Ru can be adopted as the stick-type, such as variety.

  The data on the recording medium 14 can be read by the reading means 15 shown in FIG. Here, the reading means 15 is a data reader, and the reader and the recording medium 14 can communicate with each other by radio waves or electromagnetic waves. Further, management information (opening / closing state information etc.) of the switch itself can be stored and rewritten.

Next, the life management method of the switch with a life management function shown in FIGS. 1 and 3 will be described. In this case, the storage unit 11 is input with a relational expression expressed by the equation (1). Then, the measuring means 12 measures (calculates) the load current at the time of opening and closing. For example, if α = 8 × 10 ⁸ and β = 2, the relational expression shown in Equation 2 is obtained.

The relational expression is a graph shown in FIG. In this case, there are 5000 times of opening / closing capability at 400 A, and when the load current of 400 A is opened and closed, one time is subtracted from the remaining number of times that can be opened and closed. In contrast, when closing the load current of 200A is in terms of 400A, so that subtracting ^{1/2 2} times = 1/4 times the open count remaining. The remaining number of openable / closable times is sequentially rewritten and stored in the storage medium 14.

  Thus, the switch with life management function can manage the switching history. For this reason, it is possible to prevent a supply trouble due to the inoperative operation of the opening / closing mechanism that occurs when the number of times of opening / closing is exceeded. In addition, the open / close history can be sequentially updated by rewriting, and the storage medium stores information on the latest open / close. Thereby, it is possible to improve the accuracy of management of the opening / closing history. In particular, in the selection of switch candidates in the power system monitoring and control system, it is possible to manage with higher accuracy compared to the method that manages only by the sum of the breaking current or the number of breakings, and considers the switching history (the number of times that can be opened and closed) By doing so, the life of the switch can be extended.

  In this switch with a life management function, the manager of the switch or the like can grasp the remaining number of times that can be opened and closed as the switching history based on the data read by the reading means, so that the management is easy.

  In the switch with a life management function, at least the storage medium 14 is inseparable from the switch container 2 as shown in FIG. Here, the inseparable means that it is attached to the opening / closing container 2 and integrated with the switching container 2, and when the switch 1 is moved, it is moved together with the container 2. . For this reason, when relocating the switch 1, etc., it is possible to grasp the number of times that the switch 1 can be opened and closed before the relocation, and it is consistent throughout the life cycle of the switch no matter how many times the relocation is repeated. Management becomes possible. Thereby, the precision of management, such as the frequency | count of opening and closing in this switch 1 after transfer, becomes high. In FIG. 1, the storage means 11 is not shown, but the storage means 11 other than the storage medium 14, the measurement means 12, and the calculation means 13 are also inseparable from the switch container 2.

  Next, FIG. 4 shows 2nd Embodiment, In this case, the measurement means 12, the calculating means 13, etc. are arrange | positioned outside the switch container 2. FIG. The outside may be a so-called external attachment attached to the outer surface of the switch container 2 or may be arranged at a position relatively distant from the switch container 2. In addition, when providing the measuring means 12 etc. in the exterior of the switch container 2 in this way, it is preferable to store these in the case 20.

  Even the switch with a life management function shown in FIG. 4 can determine the remaining number of times that can be opened and closed by measuring the load current that opens and closes, and has the same effect as the switch with a life management function shown in FIG. There is an effect.

Figure 5 shows a third embodiment, this case, via the communication slave station 16 the data of the storage medium 14 read by the reading unit 15 to be input to the distribution automation central unit 17. Here, the distribution automation central unit 17, and performs on-off control of the automatic switch which is installed in the monitoring and the line of the presence or absence of a power failure of the high-voltage distribution line.

  Even the switch with life management function shown in FIG. 5 can determine the remaining number of times that can be opened and closed by measuring the load current to open and close, and has the same effect as the switch with life management function shown in FIG. There is an effect. In particular, management in selecting a switch candidate to be opened / closed is stable, and the accuracy of extending the life of the switch is improved.

  In each of the embodiments described above, the calculation means 13 calculates the remaining number of openable / closable times based on the relational expression between the open / close current and the number of openable / closable times. That is, by measuring the load current that is opened and closed by the measuring means 12, and applying this load current as the switching current to the relational expression between the switching current and the number of times that can be opened and closed, the cumulative number of switching times can be obtained. Here, the cumulative number of times of opening and closing is the total number of times that the switch has been opened and closed. For this reason, this cumulative number of times of opening and closing can be used as the opening and closing history.

  As described above, by grasping the cumulative number of times of opening / closing, life management can be performed stably as in the case of the switch with life management function. That is, if the cumulative number of switching times is known, it can be determined whether or not the switch 1 has reached the use limit, and the subsequent switch 1 can be managed. In addition, the accuracy of the detected cumulative number of switching is high. Further, in selecting a switch candidate to be opened / closed, it is possible to extend the life of the switch by considering the cumulative number of switching times.

  As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, the switch 1 includes an air type, a vacuum type, and a gas type. However, any of these types may be used in the present invention. Further, the calculation means (calculation unit) 13 may calculate both the remaining number of openable / closable times and the cumulative open / closed number. In this case, the latest openable / closable remaining number and the cumulative open / closed number are stored in the storage medium 14 such as an IC tag.

It is a principal part simplification figure of the switch with a lifetime management function which shows 1st Embodiment of this invention. It is a graph which shows the relationship between switching current and the frequency | count of switching possible. It is a block diagram which shows the structure of the lifetime management function of the said switch with a lifetime management function. It is a principal part simplification figure of the switch with a lifetime management function which shows 2nd Embodiment of this invention. It is a principal part simplification figure of the switch with a life management function which shows 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Storage means 12 Measurement means 13 Calculation means 14 Storage medium 15 Reading means

Claims (2)

A switch for opening and closing a load current, measuring means for measuring the load current at the time of opening and closing, storage means for storing a relational expression between the switching current and the number of times of opening and closing, and the load current measured by the measuring means Computation means for converting the switching current stored in the storage means to obtain the remaining number of times that can be opened and closed based on the relational expression, and a storage medium capable of storing and rewriting the opening / closing history, the storage medium comprising: The openable / closable remaining number calculated by the calculating means is sequentially rewritten, and the openable / closable remaining number is stored as the open / close history, and is constituted by an IC tag capable of reading data by the reading means, and at least the A switch with a life management function, wherein an IC tag is attached to the switch container and is inseparable from the switch container. A switch for opening and closing a load current, measuring means for measuring the load current at the time of opening and closing, storage means for storing a relational expression between the switching current and the number of times of opening and closing, and the load current measured by the measuring means Computation means for obtaining the cumulative number of switching times based on the relational expression converted into the switching current stored in the storage means, and a storage medium capable of storing and rewriting the switching history, the storage medium comprising : with the stores this accumulated number of times of opening and closing sequentially rewriting the accumulated number of times of opening and closing, which is calculated by said calculating means as said closing history, and an IC tag which is capable of reading Lud over data by the reading means, and at least A switch with a life management function, wherein the IC tag is attached to the switch container and is inseparable from the switch container.

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