JP6975619B2 - Diagnostic equipment for high-voltage equipment and its diagnostic method - Google Patents

Description

INDUSTRIAL APPLICABILITY The present invention relates to a diagnostic device for high-voltage equipment and a diagnostic method thereof, and is particularly suitable for application to a diagnostic device for high-voltage equipment relating to a technique for detecting abnormal heat generation generated in high-voltage equipment.

The high-voltage power receiving board is composed of a large number of conductors, switches, current sensors, and transformers connected in the board. If the connection is poor at the conductor connection or switch, the contact resistance will increase, and the load current may cause abnormal heat generation. In order to prevent a fire due to such abnormal heat generation, it is regularly confirmed by patrol inspection that there is no abnormal heat generation part of the high voltage equipment. However, in order to reduce the patrol labor, a method of detecting abnormal heat generation by remote monitoring has been considered.

As the first conventional technique, a chemiluminescent material that emits light by bending is provided as an abnormal heat generation detection sensor in the vicinity of an energized body such as a main circuit conductor, and a shape memory alloy that deforms with temperature during abnormal heat generation forms a chemical issuer. A device for detecting abnormal heat generation by bending is disclosed (see Patent Document 1).

As a second prior art, a device is disclosed in which an odor generating means for generating an odor when the temperature of a conductor rises above a set value is installed in an energized portion of electrical equipment, and an abnormal heat generation is detected by an odor sensor. (See Patent Document 2).

As a third prior art, there is disclosed a device in which an odor sensor is arranged in a panel to detect heat generation that causes a predetermined temperature abnormality and issue an alarm (see Patent Document 3).

Japanese Unexamined Patent Publication No. 8-334415 Japanese Unexamined Patent Publication No. 6-123658 Japanese Unexamined Patent Publication No. 2006-33959

According to the first prior art, it is necessary to arrange the sensor on all the objects which may generate heat, which is structurally complicated. On the other hand, according to the second and third prior arts, although it is known that abnormal heat generation is generated in the panel in which the sensor is arranged, it may take time to identify the heat generation part.

The present invention has been made in consideration of the above points, and an attempt is made to propose a voltage equipment diagnostic device and a diagnostic method thereof that can identify an abnormal heat generation site where abnormal heat generation is occurring in a high voltage equipment with a simple configuration. It is something to do.

In order to solve such a problem, in the present invention, the odor sensor installed in the room where the high voltage equipment is installed is attached to the conductor connection portion and the contact in the high voltage power receiving panel of the high voltage equipment. An abnormal heat generation detector that generates a specific gas when melted at a predetermined temperature or higher, a current sensor that measures the load current of the high voltage equipment, and an odor sensor are used to detect the component of the specific gas. It is characterized by including a determination unit for determining that abnormal heat generation is occurring and identifying an abnormal heat generation site by the correlation between the detection value of the odor sensor and the current value of the current sensor.

Further, in the present invention, the specific component detecting means installed on each panel of the high-voltage equipment and detecting the component of a specific gas, and the conductor connection portion and the contact in the high-voltage power receiving panel of the high-voltage equipment. The specific heat generation detector that is attached and generates the specific gas when melted at a predetermined temperature or higher, a current sensor that measures the load current of the high voltage equipment, and the specific component detecting means are used. A determination unit that determines that abnormal heat generation has occurred by detecting the gas component, and identifies the abnormal heat generation site by the correlation between the detection value of the specific component detecting means and the current value of the current sensor. It is characterized by being prepared.

Further, in the present invention, an installation step of installing a specific component detecting means in a high voltage facility and an abnormal heat generation detecting agent that generates a specific gas when melted at a predetermined temperature or higher are used as a conductor connection portion in the high voltage facility. The determination unit determines that abnormal heat generation is generated by detecting the component of the specific gas using the attachment step to be attached to the contact and the specific component detection means, and the determination unit further determines. It is characterized by having a specific step of identifying an abnormal heat generation site by a correlation between a current value of a current sensor for measuring a load current of the high voltage equipment and a detection value of the specific component detecting means.

According to the present invention, it is possible to identify an abnormal heat generation site where abnormal heat generation is generated in a high voltage facility with a simple configuration.

It is a figure which shows the structural example of the diagnostic apparatus of the high voltage equipment by 1st Embodiment. It is a flowchart which shows the operation example of the diagnostic apparatus of the high voltage equipment by 1st Embodiment. It is a figure which shows an example of the time variation of a detection value of an odor sensor and a load current. It is a figure which shows an example of the display screen of a monitoring device. It is a figure which shows the change of the detection value of the odor sensor after the occurrence of abnormal heat generation. It is a figure which shows the structural example of the diagnostic apparatus of the high voltage equipment by 2nd Embodiment. It is a figure which shows the block diagram of the diagnostic apparatus of the high voltage equipment by 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(1) First Embodiment (1-1) Configuration Example of Diagnostic Device for High Voltage Equipment FIG. 1 is a diagram showing a configuration example of a diagnostic device for high voltage equipment according to the first embodiment. A waveform recording unit 8, a determination unit 9, and a display device 4 are installed outside the electric room 6. The waveform recording unit 8, the determination unit 9, and the display device 4 will be described later.

On the other hand, in the electric room 6 in which the high voltage equipment is arranged, in addition to the odor sensor 1 and the A / D converter 3 described later as an example of the specific component detecting means for detecting the component of the specific gas, the high voltage is installed. A voltage receiving board 5 is installed. The high voltage power receiving board 5 is No. 1-No. It consists of four boards to which the identification number 4 is assigned. The high voltage power receiving board 5 is No. The load current flowing in from the board of No. 1 is referred to as the identification number No. 1. 3 and No. It is distributed from the 4th board and supplied to the outside. The high-voltage power receiving board 5 has a switch such as a breaker DS and a vacuum breaker VCB, a voltage sensor for measuring the voltage of the high-voltage equipment, a current sensor CT for measuring the load current of the high-voltage equipment, and a current sensor CT. It is equipped with a conductor connection and contacts for connecting each of these devices.

In the present embodiment, the abnormal heat generation detecting agent 2 which is attached to these conductor connecting portions and contacts and generates a specific gas when melted at a predetermined temperature or higher is applied. The abnormal heat generation detector 2 is a wax that melts when the temperature exceeds the predetermined temperature, and the component of the gas that melts and is released when the temperature exceeds the predetermined temperature, that is, the molecule thereof, determines the detection value of the odor sensor 1. It plays a role of pulling up.

In the diagnostic device for high-voltage equipment according to the present embodiment, the abnormal heat generation detection agent 2 is applied to the conductor connection portion and the contact point (hereinafter, "conductor connection portion" is exemplified), and the inside of the electric chamber 6 thereof. In addition, an odor sensor 1 capable of detecting a specific gas molecule is provided, and an A / D converter 3 for converting analog signals of the current sensor CT, the odor sensor 1 and the current sensor CT in the panel into a digital signal, digital. A waveform recording unit 8 that records the data converted into a signal, a determination unit 9 that determines whether or not abnormal heat generation has occurred based on the recorded data, and a display device 4 that visually displays the abnormal heat generation portion. Be prepared.

Abnormal heat generation in the high-voltage power receiving board 5 causes poor contact when the conductor connection portion described above gradually loosens and causes poor contact, or when a switch such as a disconnector DS or a vacuum circuit breaker VCB is operated. Is the cause. When the contact is poor in this way, the contact resistance becomes large, and the contact parts such as the conductor connection part and the contacts are abnormally heated by the Joule heat generation due to the load current.

(1-2) Diagnosis Method of High Voltage Equipment The diagnostic device of the high voltage equipment according to the first embodiment has the above configuration, and then an operation example thereof will be described with reference to FIG. 1. FIG. 2 is a flowchart showing an operation example of the diagnostic device of the high voltage equipment according to the first embodiment. FIG. 3 is a diagram showing an example of time fluctuations of the detected value of the odor sensor 1 and the load current, FIG. 4 is a diagram showing an example of a display screen of the monitoring device, and FIG. 5 is a diagram showing an abnormal heat generation. It is a figure which shows the change of the detection value of the odor sensor later.

First, the odor in the electric room 6 is constantly detected by the odor sensor 1. Load current flowing through each conductor connecting portion of the high voltage in the incoming panel 5 I1, I2, I3 (corresponding to _{I 1,} I 2, _{I 3} of each shown) is detected by the current sensor CT respectively. The A / D converter 3 converts each of the detected analog signals into a digital signal. The digital signal thus converted is stored in the waveform recording unit 8 (step S1 in FIG. 2).

The detection value S [%] and the load current value I [A] of the odor sensor 1 are the detection values S [%] of the odor sensor 1 when the average in the normal state is 0% and the abnormality determination threshold is 100%. %] Has the characteristics as shown in FIG. 3 (A), while the load current value I [A] detected by the current sensor CT has the characteristics as shown in FIG. 3 (B).

The determination unit 9 constantly monitors the detection value S of the odor sensor 1, and compares the detection value S of the odor sensor 1 with a predetermined abnormality determination threshold value of 100% (step S2).

When the detection value S of the odor sensor 1 does not exceed this abnormality determination threshold value, the determination unit 9 determines that the conductor connection portion of the high voltage power receiving board 5 does not generate abnormal heat generation and is normal. Go back to step S1 and do this. As described above, if the conductor connection portion of the high voltage power receiving board 5 is normal, the contact resistance is very small, so that the abnormal heat generation detection agent 2 does not melt and gas is not released. Therefore, since the detection value S of the odor sensor 1 is at a low level (near 0%), it does not exceed the detection threshold value.

On the other hand, when the detection value S of the odor sensor 1 exceeds this abnormality determination threshold value, the determination unit 9 means that the abnormality heat generation detecting agent 2 applied to the conductor connection portion has melted at a predetermined temperature or higher. , It is determined that abnormal heat generation has occurred in the conductor connection portion, and the following steps are executed in order to identify the abnormal generation site.

For example, when a contact failure occurs in the abnormal heat generation portion 7 as shown in FIG. 1, the abnormal heat generation detection 2f reaches a predetermined temperature or higher and melts, and the gas is released. Therefore, the determination unit 9 is based on the gas. It is determined from the detection value S of the odor sensor 1 that abnormal heat generation is occurring, and the following steps are executed (step S2).

The larger the load current of the abnormal heat generation portion 7, the larger the amount of gas released from the abnormal heat generation detection agent 2, and the larger the detection value of the odor sensor 1. Hereinafter, a method for identifying the abnormal heat generation site 7 by utilizing such a correlation will be described.

Here, the time variation of the detected value S and the load currents I1, I2, I3 of the odor sensor 1 as shown in FIGS. 3 (A) and 3 (B) is shown. The load current I is represented by an effective value.

The determination unit 9 has the output waveform S (1) of the odor sensor 1 during the period P1 from the time t (N) when the detection value S of the odor sensor 1 is 100% to the time t (1) when the detection value S is 10% or less. ) To S (N), I1 (1) to I1 (N), I2 (1) to I2 (N), and I3 (1) to I3 (N) are extracted from the waveform recording unit 8 (step S3). Here, N is the number of samplings in the period P1, and the sampling period is t (N) −t (1) / (N-1).

Next, the determination unit 9 calculates the correlation coefficients r (1), r (2), and r (3) between the waveform of the detected value S of the extracted odor sensor 1 and the load currents I1, I2, and I3. The correlation coefficient r between the waveform xi and yi (i = 1, 2, ..., N) is calculated by the following equation.

Here, <x> and <y> are average values of xi and yi (i = 1, 2, ..., N), respectively. A load current I2 is flowing through the abnormal heat generation portion 7. Therefore, as shown in FIGS. 3A and 3B, the detected value S of the odor sensor 1 and the load current I2 are most similar, and the correlation coefficient r (2) is also the maximum. The magnitude of the correlation coefficient is, for example, in the order of r (2)> r (3)> r (1) (step S4).

Finally, as shown in FIGS. 4A and 4B, the determination unit 9 causes the display device 4 to display a display screen showing the estimation result of the position of the abnormal heat generation portion 7. In the illustrated display screen example, the sections A, B, and C are divided according to the places where the load currents I1, I2, and I3 flow, and the possibility that the abnormal heat generation portion 7 exists is “high”, “medium”, and It is displayed in the letters "low".

Section A is No. While each of the boards 1, 2, and 3, the section B is No. On the left side of the board of No. 4, the section C is No. It is on the right side of the board of 4.

The display screen shown in FIG. 4A shows a case where the abnormal heat generation site 7 is not detected, the state of abnormal heat generation is expressed as "none", and the possibility of abnormal heat generation in each section is also ". Nothing is displayed.

On the other hand, the display screen shown in FIG. 4B shows a case where abnormal heat generation is generated, and corresponds to the magnitude r (2)> r (3)> r (1) of the correlation coefficient. The possibility that abnormal heat generation in compartments A, B, and C has occurred is represented by the letters "low", "high", and "medium", respectively. In this way, the section B including the abnormal heat generation site 7 is specified as a position where abnormal heat generation is likely to occur, and the observer can recognize this (step S5).

By doing so, it becomes possible to identify the abnormal heat generation site where abnormal heat generation is occurring in the high voltage equipment with a simple configuration, and the patrolman can remotely electricity without actually going to the site of the electric room 6. It is possible to grasp whether or not abnormal heat generation is occurring in the room 6 and the position of the abnormal heat generation site 7. In this embodiment, one site is illustrated as an example, but in this way, the observer can intensively monitor a large number of sites, so that the high-voltage equipment is highly reliable. It becomes easy to secure the sex. Furthermore, the observer will be able to inspect the section of the high-voltage power receiving board 5 in detail according to the display screen suggesting the location where abnormal heat generation may occur, so that the position of the abnormal heat generation portion 7 can be determined. It becomes possible to identify in a shorter time. In this way, it becomes possible to quickly detect that abnormal heat generation has occurred in the abnormal heat generation site 7, so that accidents such as fire, ground fault, and short circuit can be prevented and the reliability of the electric power equipment is improved. Can contribute to.

(2) Second Embodiment FIG. 6 is a diagram showing a configuration example of a diagnostic device for high voltage equipment according to the second embodiment. Since the high-voltage equipment diagnostic device according to the second embodiment has almost the same configuration and operation as the high-voltage equipment diagnostic device according to the first embodiment, the following description focuses on the differences between the two. explain.

In the second embodiment, the high-voltage power receiving board 5 is installed outdoors, and each board No. 1 to No. The difference from the first embodiment is that the odor sensors 1a, 1b, 1c, and 1d are arranged in 4 as an example of the corresponding specific component detecting means.

No. Since it is detected by the current sensor CT that only the load current I1 is flowing in the boards 1, 2, and 3, the abnormal heat generation site 7 is specified for each board. on the other hand. No. For the board of No. 4, the correlation coefficients r (2) and r (3) of the odor sensor 1d and the load currents I2 and I3 are calculated in the same manner as in the first embodiment. As shown in FIG. 6, the abnormal heat generation site 7 is No. When it exists on the left side of the board of 4, the load current I2 is detected by the current sensor CT, so that r (2)> r (3).

Based on such a correlation coefficient, the determination unit 9 discovers using only the odor sensor 1 as in the first embodiment, as in the display screen of the display device 4 shown in FIG. 7 (B). The position of the abnormal heat generation site 7 can be estimated more finely for each board than in the case.

As described above, according to the present embodiment, the same effect as that of the first embodiment can be exhibited, and more specific information about the abnormal heat generation site 7 is given to the observer. You can make a more appropriate decision.

(3) Other Embodiments The above embodiments are examples for explaining the present invention, and the present invention is not intended to be limited only to these embodiments. The present invention can be carried out in various forms as long as it does not deviate from the gist thereof. For example, in the above embodiment, the processing of various programs has been described sequentially, but the present invention is not particularly particular. Therefore, as long as there is no contradiction in the processing results, the processing order may be changed or the processing may be configured to operate in parallel. Further, the program including each processing block in the above embodiment may be stored in a non-temporary storage medium readable by a computer, for example.

INDUSTRIAL APPLICABILITY The present invention can be widely applied to a diagnostic device for high-voltage equipment and a diagnostic method thereof for detecting abnormal heat generation generated in the high-voltage equipment.

1,1a, 1b, 1c, 1d ………… Smell sensor, 2 ………… Abnormal heat generation detector, 3 ………… A / D converter, 4 ………… Display device, 5 ………… High voltage power receiving board, 6 ………… Electrical room, 7 ………… Abnormal heat generation part, 8 ………… Waveform recording unit, 9 ………… Judgment unit, CT ………… Current sensor.

Claims (9)

A specific component detection means that is installed in a room where high-voltage equipment is installed and also detects a specific gas component,
An abnormal heat generation detector that is attached to the conductor connection and contacts in the high-voltage power receiving board of the high-voltage equipment and generates the specific gas when it melts at a predetermined temperature or higher.
A current sensor that measures the load current of the high-voltage equipment, and
It is determined that abnormal heat generation is generated by detecting the component of the specific gas using the specific component detecting means, and the correlation between the detected value of the specific component detecting means and the current value of the current sensor is used. A judgment unit that identifies the abnormal heat generation site and
A diagnostic device for high voltage equipment, characterized by being equipped with. The determination unit
The high voltage equipment according to claim 1, wherein the position where the abnormal heat generation portion is generated is estimated according to a correlation coefficient based on the load current detected by the current sensor and the detection value of the specific component detecting means. Diagnostic device. The diagnostic device for high-voltage equipment according to claim 1, further comprising a display device for displaying the position of an abnormal heat generation portion in the high-voltage equipment. Specific component detection means for detecting specific gas components installed on each panel of high-voltage equipment,
An abnormal heat generation detector that is attached to the conductor connection and contacts in the high-voltage power receiving board of the high-voltage equipment and generates the specific gas when it melts at a predetermined temperature or higher.
A current sensor that measures the load current of the high-voltage equipment, and
It is determined that abnormal heat generation is generated by detecting the component of the specific gas using the specific component detecting means, and the correlation between the detected value of the specific component detecting means and the current value of the current sensor is used. A judgment unit that identifies the abnormal heat generation site and
A diagnostic device for high voltage equipment, characterized by being equipped with. The determination unit
The high voltage equipment according to claim 4, wherein the position where the abnormal heat generation portion is generated is estimated according to a correlation coefficient based on the load current detected by the current sensor and the detection value of the specific component detecting means. Diagnostic device. The diagnostic device for high-voltage equipment according to claim 4, further comprising a display device for displaying the position of the abnormal heat generation portion in the high-voltage equipment for each panel. Installation steps to install specific component detection means in high-voltage equipment,
An attachment step in which an abnormal heat generation detector that generates a specific gas when melted at a predetermined temperature or higher is attached to a conductor connection portion and contacts in the high voltage equipment.
By detecting the component of the specific gas using the specific component detecting means, the determination unit determines that abnormal heat generation is generated, and the determination unit further measures the load current of the high voltage equipment. A specific step of identifying an abnormal heat generation site by the correlation between the current value of the current sensor and the detection value of the specific component detecting means, and
A diagnostic method for high voltage equipment, characterized by having. The determination unit
The high voltage equipment according to claim 7, wherein the position where the abnormal heat generation portion is generated is estimated according to a correlation coefficient based on the load current detected by the current sensor and the detection value of the specific component detecting means. Diagnostic method. The determination unit, to the display equipment, diagnostic method of the high-voltage installation according to claim 7 for displaying the position of the abnormal heat generation sites in the high voltage features.

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