JPH02221876A - Detector for inside abnormality of electric equipment or the like - Google Patents

Abstract

PURPOSE:To accurately detect an abnormality caused from a partial discharge generating without synchronizing to the voltage synchronization in an electric equipment by deciding a start time of sampling with an electrical signal of the partial discharge generated from the electric equipment inside. CONSTITUTION:A heat current in a container 1, which is caused by the partial discharge generating with an insulation deterioration, etc., around a conductor in the conductive container 1 impressed with a high voltage, is detected by a thermal conductivity sensor 4. A high frequency current caused by the generated partial discharge is made to flow in a ground line (l) grounding the container 1. The high frequency current is detected by a detector 11 and a signal S3 is supplied to a sampling command part 9. By the command part 9, the level of a signal S4 inputted from a filter 12 and a threshold level are compared, and the sampling command signal S5 is generated when the signal S4 with level larger than the threshold level is inputted. Next, a sampling for the frequency components of the heat current generated from the container 1 is started by a sampling part 6 to perform many samplings, then a decision for the inside abnormality can be made by means of cumulatively adding the sampling data by an arithmetic part 7.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a device for detecting abnormalities such as partial discharge and heat radiation in electrochemical elements, electrical equipment, etc. (hereinafter referred to as electrical equipment, etc.), and will be briefly described in detail. For example, the present invention relates to an internal abnormality detection device that detects partial discharge and heat dissipation occurring inside an electrochemical element or the like with high precision.

[Prior Art] An internal abnormality detection device A in a conventional electrochemical reaction heating device is generally constructed as shown in FIG. 1 in the diagram
is a conductive container, 2 is a conductor, 3 is a support insulator, 4 is a thermal conductivity sensor, 5 is an amplification section, 6 is a sampling section, 6a is an A/D conversion section, 6b is a memory section, 7 is a calculation section, 8 9 is a determination unit, 9 is a sampling command unit, and 10 is a thermobus. In other words, discharge and heat dissipation are evaluated in synchronization with the voltage V applied to the conductor 2, and this heat measurement is performed using the sampling section to classify the Peltier heat, transport heat, and Joule heat of metal ions in the electrolyte α aqueous solution. In this method, the determination unit 8 solves the determination based on the cumulative value obtained by repeating the data sampling in step 6 and the addition in the calculation unit 7 N times.

[Problems to be Solved by the Invention] The internal abnormality detection device A in the conventional electrochemical reaction heating device reliably detects heat generated in synchronization with the applied voltage V, but the heat flow is always at the applied voltage V. The problem is that abnormalities caused by heat that occur asynchronously cannot be detected because they do not occur synchronously. In addition, heat flow in a fluid can be divided into diffusion, radiation, conduction, convection, and turbulence, as well as heat absorption and heat flow.
The drawback was that it was not expressed in a frequency response expression that would allow classification of heat generation.

In view of the above-mentioned problems, the present invention aims to provide an internal abnormality detection device that can detect with high accuracy even abnormalities caused by partial discharges that occur out of synchronization with voltage synchronization in electric appliances and the like.

[Means for Solving the Problems] The internal abnormality detection device for electrical equipment, etc. of the present invention includes a thermal conductivity sensor attached to a conductive container housing a main body of electrical equipment, etc. that utilizes or generates an electrochemical reaction; a sampling unit that repeatedly samples a heat flow value electrical signal obtained by thermal lightning conversion using a thermal conductivity sensor; a calculation unit that cumulatively adds the sampled values; and a calculation unit that cumulatively adds the sampled values, and determines whether or not there is an internal abnormality in the electrical equipment based on the addition result. a determination unit for making a comparative judgment; a grounding line for grounding the conductive container; a detection unit for detecting an electrical signal of the grounding line; and a detection unit for instructing the sampling unit to start sampling in synchronization with the signal detected by the detector. The apparatus is configured to include a sampling command unit that issues a command, and to start frequency component sampling of heat flow based on a signal detected by the detector.

[Function] Since the present invention takes the above-mentioned measures, heat flow in the conductive container due to partial discharge caused by deterioration of insulation, etc. occurs around the conductor in the conductive container to which a high voltage is applied. Detected by sensor. On the other hand, an electric signal such as a high frequency current due to the generated partial discharge flows through a grounding wire that grounds the conductive container.

A detector detects this electrical signal, and the sampling section starts sampling frequency components of the heat flow generated from the conductive container, thereby performing multiple samplings. Repeated sampling is performed in the same way, the sampling data is cumulatively processed by the arithmetic unit, and the determining unit determines an internal abnormality based on the cumulative value.

[Example 1] A first embodiment of the present invention will be described in detail below with reference to FIG.

This figure is a block diagram of an internal abnormality detection device B according to the present invention applied to electrical equipment such as batteries and capacitors. In the figure, the same functional members t in the conventional example in FIG. 5 are given the same reference numerals.

In FIG. 1, an electrolyte α and a conductor 2 inserted into the conductive container 1 are housed. The conductor 2 is supported by passing through the support insulator 3 in an airtight manner. This supporting insulator 3G is connected to the connecting flanges 1a, l of the conductive container 1.
a and is fixed to the conductive container 1. A thermal conductivity sensor 4 for detecting heat flow is attached to the outer surface of the conductive container 1. The electrical signal S1 related to the thermal lightning current value detected by the thermal conductivity sensor 4 is given to the amplification section 5, and the signal @S2 amplified by the amplification section 5 is sent to the A/D conversion section 6a of the sampling section 6. The data is supplied to the memory section 6b via the memory section 6b. On the other hand, one end of the grounding wire g is connected to the IX conductive container @1 to which the thermal conductivity sensor 4 is attached, and the other end is grounded. A detector 11 made of a current transformer is provided on the ground line g to detect the high frequency current flowing through the ground line ρ. Signal Q8 detected by detector 11
3 is applied to the sampling command unit 9 via a filter 12 that passes high frequency components. Sampling command 1
The unit 9 compares the level of the signal S4 inputted from the filter 12 with a predetermined threshold level at which it can be determined that a partial discharge has occurred, and determines that the signal S4 whose level is higher than the threshold level. When input, a sampling command signal S5 is generated. Each time the sampling command signal S5 is input, the sampling unit 6 performs sampling in a short predetermined synchronization and in a frequency range necessary and sufficient for determination. The sampled data signal SS6 is then sequentially stored in the n memory sections 6b of the sampling section 6. Arithmetic unit 7
adds the already stored data signal 86' and the newly sampled data signal S6'. The sampling unit 6 and the calculation unit 7 also receive such a data signal 8.
The sampling and addition of data signal 86' is repeated N times to perform cumulative addition of data signal 86'. Then, the cumulative value data signal S7 is given to the determining section 8, and the determining section 8 determines whether or not there is an internal abnormality in the electrical equipment or the like based on the result. Note that 13 in the figure is a hitsink.

[Example 2] A second embodiment of the invention will be described with reference to FIG.

This figure shows a case where the internal abnormality detection device C of the invention is installed in a water supply and drainage pipe, and in the figure, the same functional members in FIG. 1 of the first embodiment are given the same reference numerals.

By the way, in the high voltage application part in the conductive container 1, as shown in FIG.
When a partial discharge as shown in FIG. 3 occurs, a heat flow as shown in FIG. 3 occurs in the conductive container 1 due to the partial discharge, and the thermal conductivity sensor 4 detects this as an electric signal S1. Also, the partial discharge causes grounding I! Figure 3 C for ρ
The level of the signal @S3 detected by the detector 11 when a high-frequency current as shown in FIG. When it exceeds this, the sampling command unit 9 provides the sampling unit 6 with a signal S5 instructing to start sampling. The sampling unit 6 uses the input sampling command signal S5 as the sampling start point and generates the heat flow signal 8.2 through the amplifier S5 at a short predetermined period and within a frequency range necessary and sufficient for determination, as shown in FIG. 3d. The data is sampled 0 times and sequentially stored in n memories of the memory unit 6b. While repeating the same sampling N times, the calculation unit 7 cumulatively adds the absolute values of the data signal $6' of the N samplings.

When such addition processing is performed, noise-like signals that have no specific time relationship with the high-frequency signal S3 detected at the ground wire ρ are added each time they are sampled, but because they occur at random times, the number of additions is The increase in numbers associated with this is small. On the other hand, a high frequency current signal S3 generated at ground IN
The frequency response of the sampled heat flow increases each time it is added. Therefore, when the values are cumulatively added, the frequency response gradually increases to obtain the frequency response shown in FIG. 3e.

This frequency response ranges from 4 to 112 to 1011z.
This is a cluster polymerization process using H ions and H+ ions as constituent components. Further, the Ilz peak at 3.1 and 5 and the +12 peak at 4.2 in this sensor 4 indicate heat generation and endotherm, respectively. The detected response waveform indicating the physical property content of the electrolyte α is provided to the determination unit 8, and an internal abnormality of the electrical equipment or the like is detected by determining the magnitude of the cumulative value data signal 87 level.

[Example 3] A third embodiment of the present invention will be described with reference to FIG.

This figure is a block diagram showing the internal abnormality detection device itD of the present invention. In this embodiment, the sampling command section 9 is equipped with a level change section 9a to periodically change the threshold level. There is. In this way, the ground wire g
If large noise is occurring periodically in the sampling command unit 1, the threshold level is raised to prevent noise from occurring in the sampling command unit 1.
85 can be prevented from occurring, and its influence can be eliminated.

In the drawings, the same functional members in FIGS. 1 and 2 of the first and second embodiments are designated by the same reference numerals.

Although the embodiments of the present invention have been applied to water supply and drainage pipes, batteries, and capacitors, the present invention can also be widely applied to the evaluation of other open contact connections, electrochemical elements, and corrosion-resistant materials, and similar effects can be obtained.

[Effect] Thus, since the present invention determines the point in time at which sampling of the frequency response of heat flow due to partial discharge is started based on the electrical signal of partial discharge generated inside the electrical equipment, Even partial discharges that occur out of synchronization can be accurately captured, and the detection accuracy of partial discharges can be greatly improved.

[Brief explanation of the drawing]

Figures 1 and 2 show a first embodiment and a second embodiment of the device of the present invention.
Block diagrams showing the embodiments, FIGS. 3a, b, c,
d and e are waveform diagrams each explaining the operation of the device of the present invention;
FIG. 4 is a block diagram showing a third embodiment of the device of the present invention, and FIG. 5 is a block diagram showing a conventional device. A, B, C, D... Internal abnormality detection device 1... Conductive container 2... Conductor 3... Support insulator 4.
・・Thermal conductivity sensor 5・・Amplifier 6・・
- Sampling section 6a...A/D conversion section 6b...
Memory section 7... Calculation section 8... Judgment section 9.
...Sampling command section 9a...Level change section 11...Detector 12...Filter α...
Electrolyte ρ...Grounding wire Fig. 2 α Fig. 1 Fig. 8 Fig. 1ag (+8'=ttL) (1-1z) α Fig. 4 Fig. 5

Claims (1)

[Claims] 1. A thermal conductivity sensor attached to a conductive container housing an electrochemical element or electrical device that utilizes or generates an electrochemical reaction, a sampling unit that repeatedly samples the signal obtained by the thermal conductivity sensor, and a sampling unit. In an electrochemical element or an internal abnormality detection device for an electrical equipment, the conductive container is grounded. An electrical device comprising: a grounding wire; a detector that detects an electrical signal on the grounding wire; and a sampling command section that commands the sampling section to start sampling in synchronization with the signal detected by the detector. Internal abnormality detection device for equipment, etc.