JP6917513B1 - Insulation status grasp and cutoff operation prediction device based on three-phase AC zero-phase current - Google Patents

Abstract

PROBLEM TO BE SOLVED: To predict how much future trip will occur when a zero-phase current of three-phase alternating current occurs due to poor insulation, and as a result, it is possible to systematically shut off the power supply. Provided is a device for grasping the current state of insulation and predicting the cutoff operation based on the zero-phase current of the three-phase alternating current. An insulation current state grasping and cutoff operation prediction device 0200 based on a three-phase AC zero-phase current is monitoring information which is information in which ground fault information based on a zero-phase current (≠ 0) and time information are associated with each other. Monitoring information acquisition unit 0201, monitoring information history holding unit 0202, blocking prediction information calculation rule holding unit 0203, blocking prediction information calculation acquisition unit 0204, blocking prediction information holding unit 0205, and failure prediction information output unit. It has 0206 and. [Selection diagram] FIG. 2A

Description

The present invention is an insulation based on a three-phase AC zero-phase current used for grasping the current state of insulation of a lead-in cable and predicting a failure in a customer's premises where a three-phase AC phase current is supplied from a power company that is a power source. It is related to the current status grasping and shutoff operation prediction device.

When a consumer receives a three-phase AC-phase current supplied by an electric power company, a high-voltage cable is directly connected to the customer's premises from a power receiving method that is performed via a switch or a utility pole of an electric power company located outside the customer's premises. A pull-in power receiving method, a so-called second-hand power receiving method, is adopted.

The power receiving type switch, which is made through the former switch, is installed on the pole 1 (demand) on the customer's premises near the demarcation point of responsibility that divides the scope of responsibility for the safety of the electric power company and the consumer. For pole-mounted air switch (PAS; Pole mounted Air Switch, PGS; Pole mounted Gas Switch) located on the house side, and for underground lines located on the ground in the customer's premises near the demarcation point of responsibility. A load switch (UGS; Underground Gas Switch, UAS; Underground Air Switch) is used.

Normally, in the case of a power receiving system using such a switch, an SOG control device (Storage Overcurent Ground) is arranged in the vicinity of the switch, and in the unlikely event that it is a consumer equipment. When an insulation failure accident occurs and the zero-phase current transformer built into the switch detects the zero-phase current caused by the insulation failure, the zero-phase current is output from this zero-phase current transformer as a secondary current. By receiving the current from the SOG control device and tripping (opening) the switch, the failure such as a power failure is stopped on the consumer side of the responsible branch point, that is, the failure such as a power failure does not reach other customers. ing.

On the other hand, in the latter second-hand power receiving system, the cubicle in which the high-voltage cable is directly drawn from the utility pole of the electric power company usually has a built-in zero-phase current transformer and a ground relay (GR), and also has a built-in ground relay. A high-voltage AC load switch (LBS; Road Break Switch) or a vacuum circuit breaker (VCB: Vacuum Circuit Breaker) is built-in.

Then, in this second-hand power receiving method, if an insulation failure accident occurs in the consumer equipment and the zero-phase current transformer built in the cubicle detects the zero-phase current caused by the insulation failure, this zero The ground relay receives the zero-phase current output from the current transformer as a secondary current, and trips (opens) the high-voltage AC load switch or vacuum breaker to take responsibility for failures such as power outages. It is stopped at the house side, that is, it prevents other consumers from suffering from obstacles such as power failure.

Conventionally, Patent Document 1 describes another consumer ground fault protection system including a pole-mounted air switch and an SOG control device in a power receiving system using a switch.

Japanese Unexamined Patent Publication No. 11-069607

However, in the conventional ground fault protection system described above, a zero-phase current above the threshold value due to poor insulation flows from the zero-phase current transformer in the pole air switch to the SOG control device as a secondary current. Then, this SOG control device operates and instantly trips the pole-mounted air switch to shut off the power supply, which causes an unfavorable situation such as sudden sudden stop of all equipment in the factory. Is the actual situation, and solving this has become a conventional issue.

The present invention has been made to solve the above-mentioned conventional problems, and predicts how much future trip will occur when a zero-phase current of three-phase alternating current occurs due to poor insulation. As a result, it is an object of the present invention to provide a device for grasping the current state of insulation and predicting the cutoff operation based on the zero-phase current of three-phase alternating current, which enables the power supply to be cut off systematically.

In order to solve the above problems, the present invention provides an insulation current state grasping and breaking operation prediction device based on the following three-phase alternating current zero-phase current.
That is, the first aspect of the present invention fulfills the consumer's responsibility at the demarcation point of security responsibility caused by the consumer-side ground fault (mainly a phenomenon in which a current flows to the ground in a high-voltage circuit) due to the progress of insulation failure. Based on the current information for executing the shutoff operation of the switch when the detected current based on the zero-phase current (≠ 0) of the three-phase AC flowing through the switch installed for the purpose shows a predetermined sign. A monitoring information acquisition unit that acquires monitoring information that is information that associates indirect information such as ground fault information and time (which may be information indicating time) information, and a switch (or switch) that is a monitoring target. The monitoring information history holding unit that holds the monitoring information history, which is the history of the monitoring information acquired in association with the monitoring target identification information for identifying (one-to-one correspondence with this), and the held monitoring information history A cutoff prediction information calculation rule holding unit that holds a cutoff prediction information calculation rule, which is a calculation rule for acquiring cutoff prediction information, which is information indicating the prediction of the shutoff operation of the switch based on the switch, a cutoff prediction information calculation rule, and a cutoff prediction information calculation rule. A blocking prediction information calculation acquisition unit that performs an operation to acquire blocking prediction information based on the monitoring information history, a blocking prediction information holding unit that holds the acquired blocking prediction information, and a retained blocking prediction information. It has a failure prediction information output unit for outputting in association with the monitoring target identification information, and the monitoring information acquisition unit causes the switch to perform a shutoff operation from the zero-phase current transformer of the switch. protection device connected to based on the zero-phase current of which the three-phase AC detector current circuit no current transformer retrofitting without putting a hand a current to connection of the Hall elements, magnetoresistive elements, semiconductor magneto-resistive element, the different It is configured to be indirectly measured by any one of sensors such as a square magnetic resistance element, a huge magnetic resistance element, and a tunnel magnetic resistance element, and acquired as ground fault information.

Here, the current of an asymmetric three-phase AC circuit (a circuit in which the magnitudes of the three-phase vectors are different and the phase difference between them does not become 120 °) is considered to be decomposed into symmetrical components. That is, it can be considered to be decomposed into a "positive phase current" that flows in the same phase rotation direction of each line, a "reverse phase current" that flows in the opposite phase rotation, and a "zero phase current" that flows in the same phase in common for each line. ..
"Zero-phase current" does not occur in a symmetric three-phase AC circuit (a circuit in which the three-phase vectors have the same magnitude, the phase difference between them is 120 °, and the three-phase vector sum is "0"). It is a thing (the size is 0). At this time, the symmetric component in the same rotation direction as the original vector is called the positive phase component, and the symmetric component having the opposite phase rotation is called the reverse phase component.

In other words, when the current flowing through each line of the symmetric three-phase AC circuit is measured collectively with a zero-phase current transformer, the indicated value shows "0", but if there is a ground fault in the circuit, it is zero-phase. Since a zero-phase current flows in the current transformer, the indicated value becomes a value other than "0". According to the zero-phase current transformer, this phenomenon can be used to check for the presence or absence of a ground fault.

In addition, for example, even if there is a difference in the load magnitude of equipment such as digitally controlled work equipment placed in the customer's premises or an inverter that outputs waveforms using pulse modulation, the size of the three-phase vector is large. Since they are different from each other and the phase difference between them does not reach 120 °, the current balance of the three-phase AC circuit is lost, but the sum of the magnitudes and directions of the three-phase vectors is still "0", which is a zero-phase change. No zero-phase current is generated in the current transformer. In other words, although it is unbalanced, no ground fault has occurred.
Then, when the current of the three-phase AC circuit is out of balance due to such a difference in load size, a zero-phase current is generated if a ground fault occurs in the circuit. Therefore, this zero-phase current is generated. It is possible to grasp the presence or absence of a ground fault by detecting.

In the first aspect of the present invention, the "detected current based on the zero-phase current of the three-phase AC in the switch caused by the ground fault on the consumer side due to the progress of insulation failure" has the sum of the three-phase vectors set to "0". This is due to the zero-phase current generated in the zero-phase current transformer of the switch as a result of the failure, and when the detected current based on this zero-phase current exceeds a predetermined threshold, the switch shut-off operation is executed. Indirect information based on the current information for this purpose is called "ground fault information".
At this time, the "predetermined sign of the detected current based on the zero-phase current" is the tendency of the zero-phase current, which is generally grasped as a sign of a ground fault or a sign of a microground fault from common general technical knowledge. be. Specifically, in order to evaluate various changes in the measured value of the detected current, in addition to the case where the detected current exceeds a predetermined threshold, the tendency of the measured value of the detected current to increase (when viewed microscopically). It may be based on a decreasing tendency: for example, a change in spike-like current). It refers to the case where a noticeable change appears in, but is not limited to these.

Then, in the second aspect of the present invention, the ground fault information is configured to be information based on the secondary current which is a minute current indicating the current change of the primary current which is the current obtained from the zero-phase current transformer.

Further, a third aspect of the present invention is a shutoff operation occurrence information acquisition unit that acquires cutoff operation occurrence information which is information indicating the occurrence of the shutoff operation of the switch by associating the monitoring target identification information with the time information. , The cutoff operation occurrence information holding unit that holds the acquired cutoff operation occurrence information, the failure occurrence history information acquisition unit that acquires the failure occurrence history information that is the relationship between the cutoff operation occurrence information and the monitoring information history, and the acquired failure The configuration further includes a blocking prediction information calculation rule correction unit that modifies the blocking prediction information calculation rule held based on the occurrence history information.

Further, in the fourth aspect of the present invention, the monitoring information acquisition unit has a configuration having a primary current change detecting means for detecting a current change of the primary current using a zero-phase current transformer and an amplifier.

It also provides the following three-phase AC zero-phase current-based insulation status grasp and cutoff operation prediction programs.
That is, the fifth aspect of the present invention is a three-phase alternating current flowing through a switch or the like installed to fulfill the customer's responsibility at the demarcation point of security responsibility caused by the customer's side ground fault due to the progress of insulation failure. Ground fault information, which is indirect information based on the current information for executing the shutoff operation of the switch when the detected current based on the zero-phase current (≠ 0) shows a predetermined sign, and the time (time). (It may be information indicating A monitoring information history holding program that holds the monitoring information history, which is the history of the monitoring information acquired in association with the monitoring target identification information for the purpose, and information that indicates the prediction of the switch shutoff operation based on the held monitoring information history. The blocking prediction information is obtained based on the blocking prediction information calculation rule holding program that holds the blocking prediction information calculation rule, which is the calculation rule for acquiring the blocking prediction information, the blocking prediction information calculation rule, and the monitoring information history. Failure to output the cutoff prediction information calculation acquisition program that performs the calculation for acquisition, the cutoff prediction information holding program that holds the acquired cutoff prediction information, and the cutoff prediction information that is held in association with the monitoring target identification information. It has a prediction information output program, and the ground fault information included in the monitoring information acquired by the monitoring information acquisition program is a ground that causes the switch to perform a shutoff operation from the zero-phase current transformer of the switch. Retrofit diversion device, hall element, magnetic resistance element, semiconductor magnetic resistance element, without any modification to the connection of the current of the detection current circuit based on the zero-phase current of three-phase alternating current connected to the entanglement protection device. The information is indirectly measured by any one sensor such as an anisotropic magnetic resistance element, a giant magnetic resistance element, and a tunnel magnetic resistance element.

Further, in the sixth aspect of the present invention, the ground fault information included in the monitoring information acquired by the monitoring information acquisition program is a current indicating a current change of the primary current, which is a current obtained from the zero-phase current transformer. The information is based on a certain secondary current.

Further, a seventh aspect of the present invention includes a blocking operation occurrence information acquisition program that obtains blocking operation occurrence information, which is information indicating the occurrence of the shutoff operation of the switch by associating the monitoring target identification information with the time information. A cutoff operation occurrence information holding program that holds the acquired cutoff operation occurrence information, a failure occurrence history information acquisition program that acquires failure occurrence history information that is the relationship between the cutoff operation occurrence information and the monitoring information history, and an acquired failure occurrence. The configuration further includes a blocking prediction information calculation rule modification program that modifies the blocking prediction information calculation rule held based on the history information.

Furthermore, in the eighth aspect of the present invention, the monitoring information acquisition program has a configuration having a primary current change detection subprogram that detects a current change of the primary current using a zero-phase current transformer and an amplifier.

Further, the following methods for grasping the current state of insulation and the operation method of the cutoff operation prediction device based on the zero-phase current of the three-phase alternating current are provided.
That is, the ninth aspect of the present invention is a three-phase alternating current flowing through a switch or the like installed to fulfill the customer's responsibility at the demarcation point of security responsibility caused by the customer's side ground fault due to the progress of insulation failure. Ground fault information, which is indirect information based on the current information for executing the shutoff operation of the switch when the detected current based on the zero-phase current (≠ 0) shows a predetermined sign, and the time (time). (It may be the information indicating The monitoring information history holding step that holds the monitoring information history, which is the history of the monitoring information acquired in association with the monitoring target identification information for the purpose, and the information that indicates the prediction of the switch shutoff operation based on the held monitoring information history. Blocking prediction information that holds the blocking prediction information calculation rule, which is a calculation rule for acquiring the blocking prediction information, blocks prediction information based on the blocking prediction information calculation rule holding step, the blocking prediction information calculation rule, and the monitoring information history. Failure to output the cutoff prediction information calculation acquisition step that performs the calculation for acquisition, the cutoff prediction information holding step that holds the acquired cutoff prediction information, and the cutoff prediction information that is held in association with the monitoring target identification information. The ground fault information included in the monitoring information acquired in the monitoring information acquisition step, which has a prediction information output step, is a ground that causes the switch to perform a shutoff operation from the zero-phase current transformer of the switch. The current of the detection current circuit based on the zero-phase current of the three-phase AC connected to the entanglement protection device can be changed to the current of the retrofitted circuit without any modification to the connection. The information is indirectly measured by any one sensor such as a magnetic resistance element, an anisotropic magnetic resistance element, a giant magnetic resistance element, and a tunnel magnetic resistance element.

Further, in the tenth aspect of the present invention, the ground fault information included in the monitoring information acquired in the monitoring information acquisition step is a current indicating a current change of the primary current which is a current obtained from the zero-phase current transformer. The information is based on a certain secondary current.

Furthermore, in the eleventh aspect of the present invention, the monitoring target identification information and the time information are associated with each other to acquire the blocking operation occurrence information which is the information indicating the occurrence of the shutoff operation of the switch. The step, the cutoff operation occurrence information holding step that holds the acquired cutoff operation occurrence information, the failure occurrence history information acquisition step that acquires the failure occurrence history information that is the relationship between the cutoff operation occurrence information and the monitoring information history, and the acquisition The configuration further includes a blocking prediction information calculation rule correction step for modifying the blocking prediction information calculation rule held based on the failure occurrence history information.

Furthermore, in the twelfth aspect of the present invention, the monitoring information acquisition step is configured to include a primary current change detection sub-step that detects a current change of the primary current using a zero-phase current transformer and an amplifier.

According to the present invention, even if a zero-phase current transformer arranged in the customer's premises, for example, a zero-phase current transformer in a pole-mounted air switch detects a three-phase alternating current zero-phase current, the customer The effect is that it is possible to avoid a sudden power failure due to a power cutoff in the equipment. In addition, since it is a zero-phase current transformer in the pole-mounted air switch that has already been installed, an SOG control device, and a device that can be retrofitted without any modification to these connections, these are Installation work can be performed without stopping the supply of current to the system or factory.

Explanatory drawing of the situation where the insulation current state grasping and cutoff operation prediction device based on the zero-phase current of three-phase alternating current which concerns on Embodiment 1 of this invention are arranged on the pole 1 of a consumer premises. FIG. 1A is a diagram showing the connection between the current state of insulation grasping based on the zero-phase current of three-phase alternating current and the cutoff operation prediction device and the SOG control device for the pole-mounted air switch shown in the cross section of FIG. 1A. Schematic diagram showing the inside of the SOG control device Explanatory drawing when the insulation current state grasping and cutoff operation prediction device based on the zero-phase current of three-phase alternating current which concerns on Embodiment 1 of this invention is adopted in the power receiving system using another switch. Explanatory drawing when the insulation current state grasping and cut-off operation prediction apparatus based on the zero-phase current of three-phase alternating current which concerns on Embodiment 1 of this invention is adopted as a second-hand power receiving system. Functional block diagram of the insulation current state grasping and cutoff operation prediction device based on the zero-phase current of the three-phase alternating current of the first embodiment An example of how to increase the minute current (secondary current), which is indirect information based on the current (primary current) flowing from the pole transformer current transformer to the SOG control device, to the ground fault is shown. Graph An example of other ways of increasing the current (secondary current), which is indirect information based on the current (primary current) flowing from the pole transformer current transformer to the SOG control device, to the ground fault of the minute current (secondary current). Graph showing There are other ways to increase the current (primary current) from the pole transformer current transformer to the ground fault of the minute current (secondary current), which is indirect information based on the current (primary current). Graph showing an example Secondary current, which is indirect information based on the current (primary current) flowing from the zero-phase current transformer of the pole transformer to the SOG control device, is the point that must be observed in the minute current (secondary current). Graph showing instability of Secondary current, which is indirect information based on the current (primary current) flowing from the zero-phase current transformer of the pole transformer to the SOG control device, is the point that must be observed in the minute current (secondary current). Graph with thorn-shaped parts The figure which shows the hardware configuration example of the insulation current state grasping and cutoff operation prediction apparatus based on the zero-phase current of three-phase alternating current of Embodiment 1. Flowchart of operation processing by hardware of insulation current state grasping and cutoff operation prediction device based on zero-phase current of three-phase alternating current of embodiment 1 Functional block diagram of the insulation current state grasping and cutoff operation prediction device based on the zero-phase current of the three-phase alternating current of the second embodiment The figure which shows the hardware configuration example of the insulation current state grasping and cutoff operation prediction apparatus based on the zero-phase current of three-phase alternating current of Embodiment 2. Flow chart of operation processing by hardware of insulation current state grasping and cutoff operation prediction device based on zero-phase current of three-phase alternating current of embodiment 2 Functional block diagram of the insulation current state grasping and cutoff operation prediction device based on the zero-phase current of the three-phase alternating current of the third embodiment The figure which shows the hardware configuration example of the insulation current state grasping and cutoff operation prediction apparatus based on the zero-phase current of three-phase alternating current of Embodiment 3. Flow chart of operation processing by hardware of insulation current state grasping and cutoff operation prediction device based on zero-phase current of three-phase alternating current of embodiment 3

Hereinafter, embodiments of the present invention will be described. The mutual relationship between the embodiment and the claims is as follows. The first embodiment mainly relates to claims 1 and 2, the second embodiment mainly relates to claim 3, and the third embodiment mainly relates to claim 4. The present invention is not limited to these embodiments, and can be implemented in various embodiments without departing from the gist thereof.

<Hardware description>
The computer of the present invention described below is, for example, a CPU, a non-volatile memory, a main memory, a graphic card, an I / O controller, a USB or an IEEE, which are provided on a motherboard or the like. It consists of an interface such as a LAN, a BIOS, a PCI slot, a real-time clock, a bus that connects them, and a chipset (north bridge, south bridge) that connects the buses.
A "bus" is provided to connect a CPU (MPU) with peripheral devices and various control units. Also, the buses are connected by the above-mentioned chipset.
The "CPU" (MPU) sequentially reads, interprets, and executes instruction sequences called programs on the main memory, and outputs information consisting of signals to the main memory as well. This "CPU" functions as a center for performing calculations in the computer.
An example of a "nonvolatile memory" (HDD) is a hard disk drive. The basic structure consists of a magnetic disk, a magnetic head, and an arm on which the magnetic head is mounted.
As the non-volatile memory, an SSD composed of "NAND flash" may be adopted together with the HDD, or may be adopted in place of the HDD.
The main memory is composed of volatile memory. The most representative is the dynamic ram.
The I / O controller is used for connecting to an external device. The USB connector is one example.
The IEEE1394 connector is the interface of the most representative communication standard.
An OS (operating system) is basic software for running a computer. It provides an interface for users and application programs, and plays a role in efficiently managing functional parts such as hardware and each resource.
A device driver is a program for controlling the hardware of a device for making various devices attached to a computer available to a user or an application via an operating system.
<Embodiment 1 (mainly corresponding to claims 1 and 2)>
<Overview>

The insulation current state grasping and cutoff operation prediction device based on the zero-phase current of the three-phase AC according to the present embodiment is based on the zero-phase current of the three-phase AC in the pole-mounted air switch in the power receiving method using the switch. The main feature is that the blocking prediction information is acquired by calculating the related information and the time information (or time information) according to the calculation rule, and the acquired blocking prediction information is output in association with the monitoring target identification information. ..
According to the insulation current state grasping and cutoff operation prediction device based on the zero-phase current of the three-phase alternating current according to the present embodiment, even if the zero-phase current of the three-phase alternating current is generated due to insulation deterioration in the consumer equipment, the monitoring target identification Since the cutoff prediction information is output in association with the information, it is possible to perform a planned power cutoff, and it is possible to prevent the consumer equipment from suffering inconveniences such as economic loss due to a sudden power outage due to the power outage.
<Structure>

As shown in FIG. 1A, the insulation current state grasping and cutoff operation prediction device (hereinafter referred to as “cutoff operation prediction device”) 0100 based on the zero-phase current of the three-phase alternating current of the present embodiment opens and closes in the air on the pillar. It is a device used together with the device 0120 and the SOG control device 0140.

The pole-mounted air switch 0120 is a switch adopted by a power receiving method using a switch, and is located in the customer's premises near the demarcation point RP, which divides the scope of security responsibility between the electric power company and the consumer. It is arranged on the installed pillar P (the first pillar P on the customer side), and the SOG control device 0140 is arranged in the middle of the upper and lower parts of the first pillar P.

As shown in FIG. 1B, the pole-mounted air switch 0120 accommodates a zero-phase current transformer 0122, a fixed contact 0123, a movable contact 0124, and a trip mechanism 0125 inside the metal case 0121. It is made up.

Three power cables 0136 drawn into the metal case 0121 from the power supply side (left side in the drawing) via the bushing 0126 are connected to the fixed contact 0123, while the fixed contact 0123 is connected by the trip mechanism 0125 shown briefly. Three lead-in cables 0135 toward the cubicle C pulled out of the metal case 0121 via a bushing 0126 are connected to the movable contact 0124 that operates in contact with and away from the metal case 0124.

Three power cables 0136 are collectively sandwiched in the zero-phase current transformer 0122 via a bushing 0126, and the zero-phase current transformer 0122 is SOG-controlled via two output cables 0128a and 128b. It is connected to device 0140.
The trip mechanism 0125 is also connected to the SOG control device 0140 via two control cables 0129a and 0129b.

On the other hand, as shown in FIG. 1C, the SOG control device 0140 includes an operation panel 0142 and a terminal terminal 0143 inside the resin case 0141, and the zero phase is provided at a predetermined terminal of the terminal terminal 0143. Two output cables 0128a and 128b connected to the current transformer 0122 and two control cables 0129a and 0129b connected to the trip mechanism 0125 are connected, respectively.

In such a pole-mounted air switch 0120 and the SOG control device 0140, for example, a slight ground fault occurs due to insulation deterioration in the lead-in cable 0135 that draws power from the pole 1 P to the cubicle C, which is a consumer facility. When the zero-phase current transformer 0122 in the pole-mounted air switch 0120 detects a zero-phase current, an electric signal of the zero-phase current is transmitted from the zero-phase current transformer 0122 via the output cables 0128a and 128b. It is sent to the control device 0140.

Then, in the SOG control device 0140 that receives the electric signal of the zero-phase current, the movable contacts 0124 are fixed to the trip mechanism 0125 of the pole-mounted air switch 0120 via two control cables 0129a and 0129b. By sending a control signal to separate from the contact 0123 and tripping (opening), it is possible to prevent a ripple accident that causes harm to other consumers.

The shutoff operation prediction device 0100 of the present embodiment is arranged on the pole No. 1 P together with the pole-mounted air switch 0120 and the SOG control device 0140, and is arranged inside the resin case 0141 of the SOG control device 0140, which will be described later. A ring-shaped current transformer (current sensor) 0111 that detects a minute current in this way is provided.

In this case, the ring-shaped current transformer 0111 is arranged inside the resin case 0141 of the SOG control device 0140 so that the output cable 0128a passes through the ring.
In this cutoff operation prediction device 0100, when the zero-phase current transformer 0122 in the pillar-mounted air switch 0120 detects, for example, the zero-phase current due to insulation deterioration of the lead-in cable 0135 in the customer's premises, as described above. The current transformer 0111 detects a minute current that is generated by the zero-phase current transformer 0122 and flows through the output cable 0128a (primary current; indicated by a white arrow in FIG. 1C), and this detection is performed. The minute current (secondary current; indicated by the thick black arrow in FIG. 1C) is acquired as ground fault information via the information cables 0115a and 0115b.

In the illustrated example, by arranging the current sensor 0111 so that the output cable 0128a passes through the ring of the ring-shaped current transformer 0111, a minute current indicating a change in the primary current flowing through the output cable 0128a is detected. However, the current transformer 0111 may be arranged so as to surround the predetermined terminal of the terminal terminal 0143 in the resin case 0141 of the SOG control device 0140.
Further, the cutoff operation prediction device 0100 does not necessarily have to be arranged on the No. 1 pillar P.

As shown in FIG. 2A, the blocking operation prediction device 0200 according to the present embodiment includes a monitoring information acquisition unit 0201, a monitoring information history holding unit 0202, a blocking prediction information calculation rule holding unit 0203, and a blocking prediction information calculation acquisition unit 0204. It also has a cutoff prediction information holding unit 0205 and a failure prediction information output unit 0206.

The "monitoring information acquisition unit" 0201 is a detection current based on the zero-phase current of the three-phase AC in the pole-mounted air switch caused by a microground fault on the consumer side due to the progress of insulation failure, and sets a predetermined threshold value. Information that associates ground fault information, which is indirect information based on current information for executing the shutoff operation of the pole-mounted air switch when exceeding, and time (may be information indicating the time) information. Acquires monitoring information that is.

As sensors, these monitoring information acquisition units include a current transformer (CT), a Hall element, a magnetoresistive element, a semiconductor magnetoresistive element (SMR), an anisotropic magnetic resistance element <AMR>, a giant magnetoresistive element (GMR), and the like. A tunnel magnetoresistive element (TMR) or the like can be adopted. The monitoring information includes the passage of time and the change value of the magnitude of the current (maximum value or maximum value / 2 ^{1/2 in} the case of AC), the unit time change rate of the current value, and the unit time rate change rate of the current value. Trend of time change of current value (time (horizontal axis) -secondary current value (vertical axis) The point (time) at which the time derivative of the graph becomes maximum within a predetermined time width, and the saturation point (insulation failure) It is located in factories, etc., such as the time distance from the point before the occurrence of the predetermined time, the time distance between the point (time) that becomes the maximum in the predetermined time width of the time differential coefficient of the current value, and the acceleration convergence point). The relationship between the load operation change and the monitoring information may be used. A ZCT (current transformer) is a sensor used in a typical monitoring information acquisition unit. Since these do not directly contact the cable to the SOG control device of the pole-mounted air switch that has been used conventionally, that is, the monitoring information can be acquired without contact, the conventional pole-mounted air switch can be opened and closed. It can be easily added to a system consisting of a device or an SOG control device.

Specifically, indirect information based on information for monitoring the shutoff operation of the pole-mounted air switch when, for example, a microground fault occurs in the lead-in cable due to insulation deterioration in the customer's premises, that is, this In the embodiment, a current (secondary current) based on a zero-phase current (primary current) generated in a zero-phase current transformer in a pole-mounted air switch is acquired as ground fault information, and time information is used in this ground fault information. Alternatively, the monitoring information, which is the information associated with the time information, is acquired. That is, this monitoring information includes information indicating the time of the year, month, day, hour, minute, and second when the ground fault information was acquired.

Although it is conceivable to acquire the ground fault information directly from the pole-mounted air switch, monitoring by the shutoff operation prediction device 0200 according to the present embodiment without impairing the function of the existing pole-mounted air switch. In order to realize the above, it is preferable to acquire minute current (secondary current), which is indirect information based on the current (primary current) flowing through the output cable, as ground fault information.

The “monitoring information history holding unit” 2022 holds a monitoring information history, which is a history of monitoring information acquired in association with the monitoring target identification information for identifying the pole-mounted air switch to be monitored.

The monitoring target identification information is information for identifying the pole-mounted air switch being monitored, but may be information for identifying the lead-in cable connected to the pole-mounted air switch.
By accumulating the history of monitoring information in this way, it is possible to analyze and acquire the temporal change of the ground fault information, the speed of the temporal change, and the acceleration of the temporal change. When ground fault information similar to the monitoring information can be confirmed, it is possible to warn by indicating the degree of approaching the timing of shutoff.

The "blocking prediction information calculation rule holding unit" 0203 acquires the blocking prediction information which is information indicating the prediction of the shutoff operation of the pole-mounted air switch based on the monitoring information history held by the monitoring information history holding unit 0202. It holds the blocking prediction information calculation rule, which is the calculation rule for the operation.

As this cutoff prediction information calculation rule, for example, the monitoring information acquisition unit 0201 is a current (primary current) flowing through an output cable (current path from the zero-phase current transformer of the pillar-mounted air switch to the SOG control device). ) Is acquired as ground fault information, which is indirect information based on), and a method of predicting the timing of interruption from the change in the secondary current accompanying the increase rate of the primary current can be considered.

The primary current tends to increase gradually as the vector sum of the three-phase alternating current does not become "0" due to a very small ground fault and the balance of the three phases is lost. The rule that acquires the tendency of this change in the primary current by the secondary current and predicts the time until the final ground fault that cannot be called a minute ground fault is called the cutoff prediction information calculation rule. be. If no action is taken, the primary current will only follow an increasing tendency and will not decrease significantly. Since the primary current and the secondary current are basically in a proportional relationship, it is possible to predict the ground fault by observing the change in the secondary current. How much time has passed by observing how much secondary current increases in what curve based on empirical values (relationship between actual change in secondary current and occurrence of ground fault, etc.) It is possible to predict whether a ground fault will actually occur later.

For example, as shown in FIGS. 2B to 2D, the secondary currents increase in a gentle curve at t1, t2, and t3 for a certain period of time after the secondary current starts to be acquired as ground fault information.
Then, the secondary current increases significantly at a certain point (the rate of increase of the secondary current increases), and eventually leads to a ground fault. Since it can be seen from the empirical value that the time t from the increase of the secondary current to the ground fault is almost the same in each situation of FIGS. 2B to 2D, the rate of increase of the minute current increases. By acquiring the time (the time when the ascending acceleration is the maximum), it is possible to predict how much future the ground fault will actually occur. That is, it is possible to predict when the trip will arrive, and as a result, it is possible to avoid the occurrence of a sudden power failure due to a power failure.

In addition, the points that must be observed in the secondary current are the absolute value, the rate of change (current value rise rate: per unit time: the rate of change increases as the time approaches the time of the ground fault), and the acceleration of change ( Per unit time: The acceleration increases as the time approaches the time of the ground fault), and the instability shown in FIG. ), Existence of a spiny part which is a protrusion-like waveform (spike-like current waveform) generated in the graph of the change of the secondary current shown in FIG. 2F (this momentarily loses the balance of the three-phase AC and momentarily (Caused by the phenomenon of returning to), the density of its existence, changes in the incidence of its existence (the degree of minute ground faults, that is, it occurs more frequently as the insulation performance deteriorates: something like a lightning strike). From this information and rules of thumb, the approximate time to trip can be predicted.

The "blocking prediction information calculation acquisition unit" 0204 blocks based on the blocking prediction information calculation rule held by the blocking prediction information calculation rule holding unit 0203 and the monitoring information history held by the monitoring information history holding unit 0202. Performs an operation to acquire prediction information.

The “blocking prediction information holding unit” 0205 holds the blocking prediction information acquired by the calculation in the blocking prediction information calculation acquisition unit 0204. At this time, it is preferable to keep the interruption prediction information so as to be associated with the monitoring information history so that the remaining time until the interruption and the monitoring information used for calculating the interruption can be specified.

The “fault prediction information output unit” 0206 outputs the cutoff prediction information held by the cutoff prediction information holding unit 0205 in association with the monitoring target identification information. That is, for each monitoring target, the insulation current status grasp and the cutoff prediction information are associated and output.

As shown in FIG. 3, the cutoff operation prediction device 0300 in the present embodiment includes a CPU 0311, a non-volatile memory 0321 such as an HDD and a ROM, a main memory 0313 such as a D-RAM, and an interface. The non-volatile memory 0312 stores a monitoring information acquisition program, a monitoring information history holding program, a blocking prediction information calculation rule holding program, a blocking prediction information calculation acquisition program, a blocking prediction information holding program, and a failure prediction information output program as programs. There is. The data is current signal and phase angle information, and these programs and data are read into the holding area of the main memory 0313 and executed in the operating area. In addition, the interface includes a specific low power radio and the like.
<Processing flow>

In the cutoff operation prediction device of the present embodiment, first, as shown in FIG. 4, if a microground fault occurs in the lead-in cable due to insulation deterioration in the consumer premises and the vector sum of the three-phase alternating current becomes "0". When it disappears, the monitoring information acquisition step S0401 is executed, and indirect information based on the current information for executing the shutoff operation of the pole air switch, that is, the current generated in the zero-phase current transformer in this embodiment. Acquires monitoring information, which is information that associates ground fault information, which is a secondary current based on the above, with time information or time information.

Next, the monitoring information history holding step S0402 is executed, and the history of the monitoring information acquired in association with the monitoring target identification information for identifying the pole-mounted air switch to be monitored or the lead-in cable connected to the switch is used. A certain monitoring information history is acquired and retained.

Subsequently, the cutoff prediction information calculation rule holding step S0403 is executed, and the cutoff is information indicating the prediction of the shutoff operation of the pole-mounted air switch based on the monitoring information history held in the monitoring information history holding step S0402. The blocking prediction information calculation rule, which is a calculation rule for acquiring prediction information, is held.

Next, the cutoff prediction information calculation acquisition step S0404 is executed, and an operation for acquiring the cutoff prediction information is performed based on the cutoff prediction information calculation rule and the monitoring information history.

After that, the cutoff prediction information holding step S0405 is executed to hold the cutoff prediction information acquired by the calculation in the cutoff prediction information calculation acquisition step S0404, and finally, the failure prediction information output step S0406 is executed to hold the cutoff prediction information. The cutoff prediction information held in the holding step S0405 is output in association with the monitoring target identification information. That is, for each monitoring target, the insulation current status grasp and the cutoff prediction information are associated and output.
<Effect>

As described above, in the cutoff operation prediction device of the present embodiment, even if the vector sum of the three-phase alternating current does not become "0" due to insulation deterioration in the consumer equipment and the balance of the three phases is lost, it is monitored. Since the blockage prediction information is output in association with the identification information, it is possible to predict how much future the ground fault will actually occur. That is, it is possible to systematically shut off the power supply for each monitoring target according to the degree of insulation deterioration, and it is possible to prevent the consumer equipment from suffering inconveniences such as economic loss due to a sudden power outage due to the power outage. be.

In addition, the shutoff operation prediction device of the present embodiment can be retrofitted without any modification to the zero-phase current transformer and SOG control device in the pole-mounted air switch that has already been installed, and their connections. Since it can be installed, the installation work can be performed without stopping the power supply to these systems or the factory.

In the present embodiment, the case where the insulation current state grasping and cutoff operation prediction device based on the zero-phase current of the three-phase alternating current according to the present invention is adopted in the power receiving method in which the switch is used is shown, but the present invention is limited to this. However, as shown in FIG. 1D, a power receiving method in which another switch is used for grasping the current state of insulation and interrupting operation prediction device 0100D based on the zero-phase current of three-phase alternating current according to the present invention, that is, zero-phase current change. The underground line switch 0120D having the device 0122D may be adopted in the power receiving system in which the switch 0120D is arranged together with the SOG control device 0140D.

In this case, the underground line switch 0120D is arranged near the customer side of the demarcation point RP, which divides the range of responsibility for the safety of the electric power company and the customer. Three power cables 0136 are connected to the electric power company side, while three lead-in cables 0135 toward the cubicle C are connected.

Further, as shown in FIG. 1E, a power receiving system, that is, a zero-phase current transformer 0122E and a ground relay 0140E, is used to grasp the current state of insulation based on the zero-phase current of the three-phase alternating current and the cutoff operation prediction device 0100E. Is built-in, and a high-voltage AC load switch 0120Ea or vacuum breaker 0120Eb is built in. May be adopted for.
<Embodiment 2 (mainly corresponding to claim 3)>
<Overview>

This embodiment is based on the first embodiment, and acquires the failure occurrence history information of the monitored object in which the shutoff operation actually occurs, and based on this failure occurrence history information, the pole-mounted air switch in which the shutoff operation occurs. The feature is that the monitoring information is acquired, the blocking prediction information calculation rule is modified, and the prediction accuracy of the blocking operation is continuously improved.
<Structure>

As shown in FIG. 5, in the cutoff operation prediction device 0500 of the present embodiment, the differences from the previous embodiment are the cutoff operation occurrence information acquisition unit 0507, the cutoff operation occurrence information holding unit 0508, and the failure occurrence history information. The acquisition unit 0509 and the cutoff prediction information calculation rule correction unit 0510 are further provided, and other configurations are the same as those of the previous embodiment.

The “blocking operation occurrence information acquisition unit” 0507 acquires the blocking operation occurrence information, which is information indicating the occurrence of the shutoff operation of the pole-mounted air switch, in association with the monitoring target identification information and the time information. This is because appropriate cutoff prediction information could not be used, or although there was cutoff prediction information in the first place, it was not possible to actually take measures to prevent the cutoff operation, and the pole-mounted air switch was actually cut off. Based on the occurrence of the blocking operation when the operation occurs, the relationship between the two is determined by using the monitoring information history of the monitoring target identified by the monitoring target identification information and the time information when the blocking operation occurs. The purpose is to acquire and update the blocking operation prediction rule based on the information on the relationship, and to improve the prediction accuracy of the blocking operation prediction rule. The shutoff operation and the monitoring information history may be acquired by different routes, or the failure prediction device may be configured to acquire information on the shutoff operation of the pole-mounted air switch as the monitoring information history. This cutoff operation occurrence information may be configured to be acquired from the SOG control device, or the cutoff command signal output from the SOG control device to the trip mechanism of the pole air switch is acquired and used as the cutoff operation occurrence information. May be good.

The "blocking operation occurrence information holding unit" 0508 holds the blocking operation occurrence information. The shutoff operation occurrence information is held in association with the monitoring target identification information and the time information. When this blocking operation information is acquired as the monitoring information history, the monitoring information history holding unit may also serve as the blocking operation occurrence information holding unit.

The “fault occurrence history information acquisition unit” 0509 acquires failure occurrence history information, which is the relationship between the cutoff operation occurrence information and the monitoring information history. This relationship is information that quantitatively or qualitatively determines the relationship between the characteristic information of the monitoring information history and the occurrence of the shutoff operation. Change value of maximum value or maximum value / 2 ^1/2 ) ”,“ Unit-time change rate of current value ”,“ Unit-time velocity change rate of current value ”,“ Tendency of time change of current value (time (horizontal axis)) ) -Secondary current value (vertical axis) The time distance between the point (time) at which the time derivative of the graph is maximum within the predetermined time width and the saturation point (point before the predetermined time when insulation failure occurs). , The point (time) that becomes the maximum in the predetermined time width of the time differential coefficient of the current value and the time distance from the acceleration convergence point, etc.) "," Operational changes of the load placed in the factory, etc., and monitoring information This is information indicating the relationship between "relationship between" and "time during which the shutoff operation occurred".

The “blocking prediction information calculation rule correction unit” 0510 modifies the blocking prediction information calculation rule, which is a rule for predicting the occurrence of a blocking operation based on the monitoring information history. The correction is made based on the failure occurrence history information. The failure occurrence history information may be modified based on the failure occurrence history information for as many monitoring targets as possible, although the interruption prediction information calculation rule may be modified by using one monitoring target. do. It is preferable to obtain the optimum correction value by statistically processing a large amount of failure occurrence history information for the element to be corrected. In addition, it is preferable to collect failure occurrence history information for each type of monitoring target and make corrections so that the population has mechanical commonality. This is because it is recognized that there is a habit of operation depending on the type of pole-mounted air switch, or there is a habit of changing a microground fault depending on the type of CV cable. Furthermore, since it is considered that there is a habit of ground fault information depending on the type of zero-phase current transformer of the pole-mounted air switch, failure occurrence history information is collected for each population in which the zero-phase current transformer is common. , It is preferable to modify the blocking prediction information calculation rule. In this case, as a matter of course, the cutoff prediction information calculation rule is also the various parts used in the pole air switch, SOG control device, CV cable or pole air switch (especially the type of zero-phase current transformer). ), It is assumed that it is held in the blocking prediction information calculation rule holding unit.

As shown in FIG. 6, the cutoff operation prediction device 0600 of the present embodiment includes a CPU 0611, a non-volatile memory 0612 such as an HDD and a ROM, a main memory 0613 such as a D-RAM, and an interface. The non-volatile memory 0612 has a monitoring information acquisition program, a monitoring information history holding program, a blocking prediction information calculation rule holding program, a blocking prediction information calculation acquisition program, a blocking prediction information holding program, a failure prediction information output program, and a blocking operation occurrence as programs. The information acquisition program, the interruption operation occurrence information retention program, the failure occurrence history information acquisition program, and the interruption prediction information calculation rule modification program are stored. The data is current signal and phase angle information, and these programs and data are read into the holding area of the main memory 0613 and executed in the operating area. In addition, the interface includes a specific low power radio and the like.
<Processing flow>

In the shutoff operation prediction device according to the present embodiment, as shown in FIG. 7, the shutoff operation occurrence information acquisition step S0707 is executed, and the monitoring target identification information and the time information are associated with each other to correlate the pole-mounted air switch. The cutoff operation occurrence information, which is information indicating the occurrence of the cutoff operation, is acquired, and then the cutoff operation occurrence information holding step S0708 is executed to hold the cutoff operation occurrence information acquired in the cutoff operation occurrence information acquisition step S0707.

Then, the failure occurrence history information acquisition step S0709 is executed to acquire the failure occurrence history information which is the relationship between the failure occurrence information and the monitoring history information, and then the interruption prediction information calculation rule correction step S0710 is executed. , The cutoff prediction information calculation rule held based on the acquired failure occurrence history information is modified.
<Effect>

As described above, in the cutoff operation prediction device according to the second embodiment, the failure occurrence history information of the monitoring target in which the cutoff operation actually occurred is acquired, and the cutoff operation occurs based on the failure occurrence history information. Since the monitoring information of the pole-mounted air switch is acquired and the cutoff prediction information calculation rule is modified, it is possible to continue to improve the prediction accuracy of the cutoff operation.
<Embodiment 3 (mainly corresponding to claim 4)>
<Overview>

The present embodiment is based on the first and second embodiments, and is characterized in that the monitoring information acquisition unit has a primary current change detecting means for detecting a current change of the primary current using a zero-phase current transformer and an amplifier.
<Structure>

As shown in FIG. 8, in the cutoff operation prediction device 0800 of the present embodiment, the difference from the previous embodiment is that the monitoring information acquisition unit 0801 uses a zero-phase current transformer and an amplifier to change the current of the primary current. The point is that the primary current change detecting means 0801a for detecting the above is provided, and other configurations are the same as those of the previous embodiment.

Specifically, in the cutoff operation prediction device 0800 of the present embodiment, as a sensor for detecting a minute current indicating a change in the primary current flowing from the on-pillar air switch to the SOG control device, a current converter (CT) is used. A precision current sensor of any of Hall element, magnetoresistive element, semiconductor magnetoresistive element (SMR), anisotropic magnetoresistive element <AMR>, giant magnetoresistive element (GMR), and tunnel magnetoresistive element (TMR) is adopted. At the same time, an amplifier that is excellent in the linearity of amplification of a minute current and maintains the similarity of waveforms is adopted.

As shown in FIG. 9, the cutoff operation prediction device 0900 of the present embodiment includes a CPU 0911, a non-volatile memory 0912 such as an HDD and a ROM, a main memory 0913 such as a D-RAM, and an interface. The non-volatile memory 0912 has a monitoring information acquisition program, a primary current change detection subprogram, a monitoring information history holding program, a breaking prediction information calculation rule holding program, a breaking prediction information calculation acquisition program, a breaking prediction information holding program, and a failure prediction as programs. The information output program, the cutoff operation occurrence information acquisition program, the cutoff operation occurrence information retention program, the failure occurrence history information acquisition program, and the cutoff prediction information calculation rule correction program are stored. The data is current signal and phase angle information, and these programs and data are read into the holding area of the main memory 0913 and executed in the operating area. In addition, the interface includes a specific low power radio and the like.
<Processing flow>

In the cutoff operation prediction device according to the present embodiment, as shown in FIG. 10, in the consumer premises, for example, a microground fault occurs due to insulation deterioration of the lead-in cable, and the vector sum of the three-phase alternating current does not become “0”. Then, the monitoring information acquisition step S1001 is executed.

At this time, the primary current change detection sub-step S1001a is executed, and indirect information based on the information for executing the shutoff operation of the pole-mounted air switch, that is, in this embodiment, the precision current sensor and the minute amount. A secondary current generated based on the primary current flowing through the output cable generated by the zero-phase current transformer of a pole-mounted air switch by an amplifier with excellent current amplification linearity and waveform similarity. The monitoring information, which is the information associated with the ground fault information and the time information or the time information, is acquired.
<Effect>

As described above, the cutoff operation prediction device according to the third embodiment can accurately detect the current change of the primary current, which is the detection current based on the zero-phase current of the three-phase alternating current due to the microground fault. It is possible to further improve the prediction accuracy.

0100 Insulation status grasping and cutoff operation prediction device based on zero-phase current of three-phase AC 0120 Pole-mounted air switch 0201 Monitoring information acquisition unit 0202 Monitoring information history holding unit 0203 Blocking prediction information calculation rule holding unit 0204 Blocking prediction information calculation acquisition Part 0205 Blocking prediction information holding part 0206 Failure prediction information output part

Claims (12)

Security responsibilities caused by ground faults on the consumer side due to the progress of insulation failure The detection current based on the zero-phase current of the three-phase alternating current flowing through the switch installed to fulfill the customer's responsibility at the demarcation point is predetermined. Monitoring information acquisition unit that acquires monitoring information that is information that associates ground fault information, which is indirect information based on current information for executing the shutoff operation of the switch when a predetermined sign is shown, and time information. When,
A monitoring information history holding unit that holds a monitoring information history, which is a history of monitoring information acquired in association with monitoring target identification information for identifying a switch that is a monitoring target.
With the blocking prediction information calculation rule holding unit that holds the blocking prediction information calculation rule, which is a calculation rule for acquiring the blocking prediction information, which is information indicating the prediction of the switch shutoff operation based on the held monitoring information history. ,
A cutoff prediction information calculation acquisition unit that performs a calculation for acquiring the cutoff prediction information based on the cutoff prediction information calculation rule and the monitoring information history.
A blocking prediction information holding unit that holds the acquired blocking prediction information,
It has a failure prediction information output unit for outputting the retained cutoff prediction information in association with the monitoring target identification information.
The monitoring information acquisition unit obtains the current of the detection current circuit based on the zero-phase current of the three-phase AC connected to the ground fault protection device that causes the switch to shut off from the zero-phase current transformer of the switch. Any one sensor such as a retrofit current converter, Hall element, magnetoresistive element, semiconductor magnetoresistive element, anisotropic magnetic resistance element, giant magnetoresistive element, tunnel magnetoresistive element, etc. without any modification to the connection. Insulation status grasp and cutoff operation prediction device based on the zero-phase current of three-phase AC that is indirectly measured by and acquired as ground fault information. The ground fault information is information based on the secondary current, which is a minute current indicating the current change of the primary current, which is the current obtained from the zero-phase current transformer. Insulation based on the zero-phase current of the three-phase alternating current according to claim 1. Current status grasping and shutoff operation prediction device. A shutoff operation occurrence information acquisition unit that acquires cutoff operation occurrence information, which is information indicating the occurrence of a switch shutoff operation by associating the monitoring target identification information with the time information.
A shutoff operation occurrence information holding unit that holds the acquired shutoff operation occurrence information,
A failure occurrence history information acquisition unit that acquires failure occurrence history information, which is the relationship between the cutoff operation occurrence information and the monitoring information history,
The cutoff prediction information calculation rule correction unit that corrects the cutoff prediction information calculation rule held based on the acquired failure occurrence history information,
The device for grasping the current state of insulation and predicting the cutoff operation based on the zero-phase current of the three-phase alternating current according to claim 1 or 2. The three-phase according to claim 2 or claim 3, wherein the monitoring information acquisition unit has a primary current change detecting means for detecting a current change of the primary current using a zero-phase current transformer and an amplifier. Insulation status grasp and cutoff operation prediction device based on AC zero-phase current. Safety responsibilities caused by ground faults on the consumer side due to the progress of insulation failure The detection current based on the zero-phase current of the three-phase alternating current flowing through the switch installed to fulfill the customer's responsibility at the demarcation point is predetermined. A monitoring information acquisition program that acquires monitoring information that is information that associates ground fault information, which is indirect information based on current information for executing a switch shutoff operation when a predetermined sign is shown, and time information. When,
A monitoring information history retention program that retains the monitoring information history, which is the history of monitoring information acquired in association with the monitoring target identification information for identifying the switch that is the monitoring target.
With a blocking prediction information calculation rule holding program that holds a blocking prediction information calculation rule, which is a calculation rule for acquiring the blocking prediction information, which is information indicating the prediction of the switch shutoff operation based on the held monitoring information history. ,
A blocking prediction information calculation acquisition program that performs calculations to acquire blocking prediction information based on the blocking prediction information calculation rule and the monitoring information history.
A blocking prediction information holding program that holds the acquired blocking prediction information,
A failure prediction information output program for outputting the retained cutoff prediction information in association with the monitoring target identification information,
Have,
The ground fault information included in the monitoring information acquired by the monitoring information acquisition program is a three-phase connected to a ground fault protection device that causes the switch to shut off from the zero-phase current transformer of the switch. Detection current based on AC zero-phase current No modification to the connection of the current in the circuit A three-phase AC zero-phase current-based insulation status grasp and cutoff operation prediction program that can be read and executed by a computer, which is information indirectly measured by any one sensor such as an element or a tunnel magnetoresistive element. The ground fault information included in the monitoring information acquired by the monitoring information acquisition program is information based on the secondary current, which is a current indicating the current change of the primary current, which is the current obtained from the zero-phase current transformer. A three-phase AC zero-phase current-based insulation current status grasping and cutoff operation prediction program that can be read and executed by the computer according to 5. A blocking operation occurrence information acquisition program that acquires blocking operation occurrence information, which is information indicating the occurrence of a switch shutoff operation by associating the monitoring target identification information with the time information.
A blocking operation occurrence information retention program that retains the acquired blocking operation occurrence information,
A failure occurrence history information acquisition program that acquires failure occurrence history information, which is the relationship between the cutoff operation occurrence information and the monitoring information history,
A blocking prediction information calculation rule correction program that corrects the blocking prediction information calculation rule held based on the acquired failure occurrence history information, and a blocking prediction information calculation rule correction program.
A program for grasping the current state of insulation and predicting a cutoff operation based on a zero-phase current of three-phase alternating current, which can be read and executed by the computer according to claim 5 or 6. The computer according to claim 6, wherein the monitoring information acquisition program has a primary current change detection subprogram that detects a current change of the primary current using a zero-phase current changer and an amplifier, or a computer according to claim 6. A program for grasping the current state of insulation and predicting the cutoff operation based on the zero-phase current of three-phase AC that can be read and executed by. Security responsibilities caused by ground faults on the consumer side due to the progress of insulation failure The detection current based on the zero-phase current of the three-phase alternating current flowing through the switch installed to fulfill the customer's responsibility at the demarcation point is predetermined. Monitoring information acquisition step to acquire monitoring information that is information that associates ground fault information, which is indirect information based on current information for executing a switch shutoff operation when a predetermined sign is shown, and time information. When,
A monitoring information history holding step that holds a monitoring information history, which is a history of monitoring information acquired in association with monitoring target identification information for identifying a switch that is a monitoring target, and a monitoring information history holding step.
The blocking prediction information calculation rule holding step that holds the blocking prediction information calculation rule, which is the calculation rule for acquiring the blocking prediction information, which is the information indicating the prediction of the switch shutoff operation based on the held monitoring information history. ,
A blockage prediction information calculation acquisition step that performs an operation for acquiring blockage prediction information based on a blockage prediction information calculation rule and a monitoring information history, and a blockage prediction information calculation acquisition step.
A block prediction information holding step that holds the acquired blocking prediction information, and
A failure prediction information output step for outputting the retained cutoff prediction information in association with the monitoring target identification information, and
Have,
The ground fault information included in the monitoring information acquired in the monitoring information acquisition step is a three-phase connected to a ground fault protection device that causes the switch to perform a shutoff operation from the zero-phase current transformer of the switch. Detection current based on AC zero-phase current The current of the circuit can be connected without any modification to the retrofit switch, Hall element, magnetoresistive element, semiconductor magnetic resistance element, anisotropic magnetic resistance element, giant magnetic resistance. An operation method of an insulation current state grasping and cutoff operation prediction device, which is a computer, which is information indirectly measured by any one sensor such as an element or a tunnel magnetoresistive element. The ground fault information included in the monitoring information acquired in the monitoring information acquisition step is information based on the secondary current, which is a current indicating the current change of the primary current, which is the current obtained from the zero-phase current transformer. 9. The operation method of the insulation current state grasping and shutoff operation prediction device, which is the computer according to 9. A blocking operation occurrence information acquisition step for acquiring blocking operation occurrence information, which is information indicating the occurrence of a switch shutoff operation by associating the monitoring target identification information with the time information, and
The shutoff operation occurrence information holding step that holds the acquired shutoff action occurrence information, and
A failure occurrence history information acquisition step for acquiring failure occurrence history information, which is the relationship between the cutoff operation occurrence information and the monitoring information history,
The blocking prediction information calculation rule correction step for modifying the blocking prediction information calculation rule held based on the acquired failure occurrence history information, and the blocking prediction information calculation rule correction step.
The operation method of the insulation current state grasping and cutoff operation prediction apparatus which is the computer according to claim 9 or 10. The computer according to claim 10, wherein the monitoring information acquisition step includes a primary current change detection substep that detects a current change of the primary current using a zero-phase current transformer and an amplifier, or a computer according to claim 10. How to operate the insulation status grasp and cutoff operation prediction device.

Images