JP2697362B2 - Discharge detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge detector for detecting a discharge inside a gas-filled electric device in which an insulating gas such as SF6 gas is filled.

[0002]

2. Description of the Related Art As an SF6-decomposed gas sensor for detecting that SF6 gas has been decomposed by discharging inside a gas-filled electric device in which an insulating gas such as SF6 gas is enclosed, see, for example,
-41851. FIG. 3 is a sectional view and FIG. 4 is a plan view. In the figure, reference numeral 1 denotes a substrate on which an electrode and a sensitive film to be described later are attached, 2 denotes a first electrode for detecting a change in electric resistance of the sensitive film, and 2a denotes a first lead connected to the first electrode 2. Line 3 is a second electrode for detecting a change in the electrical resistance of the sensitive film, and 3a is a second electrode 3
Is a sensitive film whose electric resistance changes in response to SF6 decomposition gas. Reference numeral 5 denotes a heating element having a self-temperature control function for maintaining the temperature of the sensitive film 4 within a certain range, and reference numerals 6a and 6b denote lead wires for supplying power to the heating element 5.

The SF6-decomposed gas sensor having this structure is fixed inside a gas-filled electric device, and the sensitive film 4 is sensitive to the electric resistance by the SF6-decomposed gas generated when an abnormality such as discharge occurs inside the gas-filled electric device. Changes. This change in electric resistance is detected by a first lead wire connected to a first electrode 2 provided at both ends of a sensitive film 4 and a first lead wire connected to a second electrode 3.
The 2a and the second lead wire 3a are taken out of the device and connected to a detecting unit (not shown) to detect a change in electric resistance to sense a discharge inside the device. The sensitive film 4 has a temperature dependence on the electric resistance, and the electric resistance changes even if the ambient temperature changes, which may be erroneously recognized as an internal abnormality. For this reason, during operation, the heating element 5 is mounted on the back surface of the substrate 1 in order to maintain a constant temperature, and predetermined power is supplied from the electrodes 6a and 6b to keep the temperature constant. As the heating element 5, an element having a self-temperature control function such as BaTiO ₃ is used. The power supplied by applying a predetermined voltage becomes substantially constant, and the temperature is maintained constant.

[0004]

In the conventional SF6-decomposed gas sensor having the above-described structure, since the sensitive film has a temperature dependency, the value of the electric resistance detected varies depending on the weather conditions and the operating conditions, and the ambient temperature varies. If there is a sudden change, it may be erroneously recognized as an abnormality inside the device, and a means for maintaining a constant temperature is required.

The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a discharge detector which has a good detection sensitivity when a discharge occurs in a device and is not affected by the ambient temperature.

[0006]

A discharge detector according to the present invention comprises a substrate formed of an insulator and a metal having a predetermined width.
A first electrode attached to one end of the substrate,
A metal is deposited with a predetermined width, and a first end is attached to the other end of the substrate.
A second electrode disposed at a predetermined distance from the electrode,
Arrange on the substrate so as to bridge between the first electrode and the second electrode
Installed in the gas-filled electrical equipment.
Sensitive body of solid electrolyte containing metal ion sensitive to ionization
And a change in electrical resistance between the two electrodes.
Is provided .

A substrate formed of an insulator and a predetermined width
The anode active material is adhered and disposed at one end of the substrate.
The first electrode and the cathode active material are adhered to each other with a predetermined width.
A second electrode disposed at a predetermined distance from one electrode
And a substrate so as to bridge between the first electrode and the second electrode.
On the top, generated by internal discharge of gas-filled electrical equipment
Of solid electrolyte containing metal ions in response to free electrons
A sensing element consisting of a sensitive body
And a detection unit for detecting the conversion.

[0008]

The sensing element of the discharge detector according to the present invention is formed of a solid electrolyte, the sensing element is sensitive to free electrons, the metal ions present in the sensing element are reduced, the metal is deposited, and the sensing element is partially formed. It is bridged and the electric resistance between both electrodes changes. By detecting the change in the electric resistance, the discharge inside the device can be sensed.

[0009] Further, a battery is provided by using a detection element having a structure in which an anode active material is mounted as a first electrode and a cathode active material is mounted as a second electrode, and a sensitive body is mounted with a solid electrolyte containing metal ions. When the discharge is generated inside the device, the sensitive body responds to the free electrons generated by the discharge, and the metal is bent out, and the sensitive body is partially bridged to lower the voltage between the electrodes. By detecting this voltage change, the discharge inside the device can be sensed.

[0010]

【Example】

Embodiment 1 FIG. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a detecting element according to the present invention, and FIG. 2 is a side view of the detecting element shown in FIG. In the figure
Reference numeral 10 denotes a detection element, a substrate 11 formed of an insulator, a first electrode 12 having a metal, for example, silver, attached to one end of the substrate 11 with a predetermined width, and another end of the substrate 11. to keep the first electrode 12 by a predetermined distance, the metal in a predetermined width, the second electrode 13 is deposited, for example silver, such as a solid electrolyte for example Ag ₆ WO ₄ containing metal ions, the first It comprises a sensitive body 14 mounted so as to bridge between the electrode 12 and the second electrode 13.
The first electrode 12 has a first lead wire 12a and the second electrode 13
Is connected to a second lead wire 13a. Reference numeral 15 denotes a detection unit that detects a change in the electric resistance of the detection element 10. The detection element 10 is installed at a place where free electrons generated by internal discharge of the gas-filled electric device fly, and is connected to the first lead wire 12a connected to the first electrode 12, and the second electrode 13. The second lead wire 13a is extended and led out from an insulating terminal (not shown) provided on the container wall of the gas-filled electric device, and is connected to a detection unit 15 provided outside.

The discharge detector having the above structure is ionic conductive in a normal state without internal discharge, and has a specific resistance in the range of 10 Ω · cm to 100 kΩ · cm, depending on the material, and is ionic conductive. . If an internal discharge devices occurs by gas decomposition of SF6 or the like sealed inside equipment, SF _4,
Free electrons are released together with decomposition products such as S ₂ F ₂ . The free electrons react with metal ions (for example, silver ions) contained in the sensitizer 14, and the metal (for example, silver) is deposited on the surface of the sensitizer 14, and the sensitizer 14 is partially bridged. Resistance decreases. The electrical resistance of the sensitive body 14 changes remarkably according to the amount of metal (for example, silver) protruded regardless of the ambient temperature. By detecting the change in the electric resistance by the detection unit 15, the presence or absence of the discharge inside the device and the magnitude of the discharge can be sensed. The thickness of the sensitive body 14 is, for example, several tens to several hundreds A °.
If it is formed into a thin film, it reacts sensitively to free electrons,
Even a minute internal discharge that is a precursor to dielectric breakdown can be detected. By taking out the detecting element 10 and confirming the amount of metal protruded on the surface of the sensitive body 14, the magnitude of the internal discharge can be known more reliably. RbAg ₄ I ₅ and Ag ₁₉ include those containing silver ions of the solid electrolyte used for the sensitizer 14.
There are I ₁₅ P ₂ O ₇ , Ag ₇ I ₄ PO ₄ , Ag ₆ I ₄ CrO _2, etc., and the reaction with free electrons differs depending on the substance. There is no. Also, the material of the first electrode 12 and the second electrode 13 may be any material that can be electrically connected to the sensitive body 14, and it goes without saying that other metals are not related to the detection function. .

Embodiment 2 FIG. Embodiment 1 FIG. Although the case where a solid electrolyte containing silver ions is used as the sensitizer 14 is shown, a solid electrolyte containing copper ions such as Rb ₄ Cu ₁₆ I ₇ Cl ₁₃ is used, and the first electrode 12 and the second electrode ₁₃ are used. Sensitive body material
Example 1 by attaching a metal, for example, copper, which can be electrically connected to the substrate 14. In the same manner as described above, free electrons generated by the discharge react with the sensitive body 14 to form copper and change the electrical resistance. Embodiment 1 By detecting the change of the electric resistance. In the same manner as in the above, it is possible to detect the presence / absence of discharge inside the device. Rb as a solid electrolyte containing copper ions
Cu ₄ I _1.75 Cl _3.75 , Cu ₂ SO ₄ , etc., and the same effect can be obtained by using any of them.

Embodiment 3 FIG. The first electrode 12 shown in FIGS. 1 and 2 is made of an anode active material such as silver, the second electrode 13 is made of a cathode active material such as iodine, and the sensitizer 14 is used in Example 1. In the same manner as described above, the detection element 10 having a solid electrolyte containing silver ions, for example, Ag ₆ I ₄ WO ₄ attached thereto forms a battery. Example 1. When a discharge occurs inside a gas-filled electrical device in which a discharge detector is installed and free electrons fly, a first embodiment is described. And a reduction reaction with silver ions contained in the solid electrolyte,
Silver comes out. The amount of silver deposited increases with the amount of incoming free electrons. The function of the battery formed in the detection element 10 decreases in accordance with the amount of silver protruding on the surface of the sensitive body 14. The internal discharge of the gas-filled electric device can be sensed by providing the detection unit 15 with a function of capturing a voltage change and detecting the voltage change of the battery function formed on the detection element 10. In this configuration, the sensitizer 14 contains a solid electrolyte containing other silver ions such as RbAg ₄ I _5, Ag ₁₉ P ₂ O ₇ , Ag ₇ I ₄ PO ₄ , Ag
Similar effects can be obtained by using ₆ I ₄ CrO ₂ or the like.

[0014]

As described above, according to the present invention, the sensitivity of the detecting element
As a body, generated by internal discharge of gas-filled electrical equipment
By having a solid electrolyte containing metal ions to be sensitive to the free electrons, sensitive body sensitive regardless atmosphere temperature, electrical resistance, or, in the one that forms the battery voltage varies significantly, the change an effect that can sensitively sense without the temperature of the sensing element constant greater disarm the device to detect.

[Brief description of the drawings]

FIG. 1 is a plan view of a discharge detector according to an embodiment of the present invention.

FIG. 2 is a side view of FIG. 1 of the discharge detector according to one embodiment of the present invention;

FIG. 3 is a side view of a conventional discharge detector.

FIG. 4 is a plan view of a conventional discharge detector of FIG. 3;

[Explanation of symbols]

 11 Substrate 12 First electrode 13 Second electrode 14 Sensitive body 15 Detector

Claims (4)

(57) [Claims] 1. A substrate formed of an insulator, a metal attached to a predetermined width, a first electrode provided at one end of the substrate, and a metal attached to a predetermined width, A second electrode disposed at a predetermined distance from the first electrode at the other end of the substrate, and a second electrode disposed between the first electrode and the second electrode.
Gas-filled electric machine arranged on the substrate so as to bridge
Metal sensitive to free electrons generated by the internal discharge of the
A discharge detector, comprising: a detection element including a solid electrolyte sensitizer including an ON state; and a detection unit configured to detect a change in electric resistance between the two electrodes . 2. The discharge detector according to claim 1, wherein the first electrode and the second electrode include a detection element formed of silver, and the sensitive body is formed of a solid electrolyte containing silver ions. 3. The discharge detector according to claim 1, wherein the first electrode and the second electrode include a detection element formed of copper, and the sensitive body is formed of a solid electrolyte containing copper ions. 4. A substrate formed of an insulator, a first electrode provided at one end of the substrate, to which an anode active material is attached with a predetermined width, and a cathode active material having a predetermined width. Is attached,
A second electrode disposed at a predetermined distance from the first electrode, and a bridge between the first electrode and the second electrode;
Mounted on the board as described above, and
Including metal ions sensitive to free electrons generated by electricity
A detection element consisting of a sensitive element of the solid electrolyte, the cars
A discharge detector including a detection unit that detects a change in voltage between electrodes .