JPH08306279A - Vacuum degree monitoring device for vacuum circuit-breaker - Google Patents

Abstract

PURPOSE: To eliminate the interruption to service for checking a vacuum degree and to eliminate a high-voltage device, and to facilitate the judgement of vacuum degree, and to lower the working cost by providing a signal processing circuit unit forming a vacuum degree monitoring device together with a detecting unit. CONSTITUTION: A signal processing circuit unit 5 outputs the alarm signal H when a vacuum degree is deteriorated, and a signal processing circuit unit 5 forms a vacuum degree monitoring device together with a detecting unit 3a. An output terminal of the detecting unit 3a is connected to the signal processing circuit unit 5 through a connecting cable 4. The detecting unit 3a detects the spectrum of an arc A generated between contacts 61, 62 when a vacuum valve 6 is opened, and outputs an electric signal. The signal processing circuit unit 5 judges the lowering of the vacuum degree on the basis of this electric signal when the spectrum shows the bright line spectrum of the insulating gas GS. In this case, since the signal processing circuit unit 5 is provided without a contact with a main circuit, the interruption to service for checking the vacuum degree is unnecessary. Furthermore, since a high-voltage device is unnecessary, the judgement of vacuum degree is facilitated, and the cost of the maintenance work is lowered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum degree monitoring device for a vacuum circuit breaker for discriminating and monitoring the degree of vacuum of a vacuum valve used in a current switching part of a vacuum switching device, and more particularly to non-contact determination of the degree of vacuum. The present invention relates to a vacuum degree monitoring device for a vacuum circuit breaker, which can reduce the working cost as much as possible.

[0002]

2. Description of the Related Art FIG. 4 shows a general gas-insulated switchgear (C-
GIS) is a main part cross-sectional view showing the main part structure in the open state of the vacuum circuit breaker housed in (GIS).
Reference numeral 6 is a vacuum valve for controlling the on / off of the vacuum circuit breaker. Reference numeral 61 is a fixed contact that is positioned and fixed in the vacuum valve 6, and 62 is a movable contact that is movable in the vacuum valve 6 in the axial direction. The fixed contact 61 and the movable contact 62 that form a pair of contacts are in an off state. In, the respective tip portions are arranged so as to face each other with a certain interval.

Reference numerals 611 and 612 denote insulating cylinders of the vacuum valve 6 made of ceramics, which are axially joined and extended by a metal cylinder 613 to form a cylindrical vacuum container.

Reference numerals 614 and 615 denote insulating cylinders 611 and 61.
2 is an end plate that closes both ends of a cylindrical container made of 2 and a metal cylinder 613, 618 is a bellows for maintaining airtightness around the movable contact 62, and 619 is a concentric surrounding of the fixed contact 61 and the movable contact 62. It is a shield. The fixed contact 61 is fixed to the end plate 614, and the movable contact 62 is airtightly connected to the end plate 615 via a bellows 618.

Next, referring to the characteristic diagram of FIG.
The operation of the conventional vacuum degree monitoring device for a vacuum circuit breaker shown in FIG. In the vacuum valve 6 of the vacuum circuit breaker housed in the gas insulated switchgear, the SF
₆ (Sulfur hexafluoride) gas penetrates, and the degree of vacuum becomes lower than, for example, 10 ⁻³ Torr (tricheri) order (1
Fixed contact 6 when the atmospheric pressure rises above 0 ^-3 Torr)
1 and the movable contact 62 (between the electrodes) and between the fixed contact 61 and the movable contact 62 and the shield 619 (between the electrode and the shield) [kV] (in this case, 1
The discharge voltage with respect to the interval of mm) changes as shown by the solid line and the broken line in FIG. 5, respectively.

Therefore, when the vacuum circuit breaker is, for example, in the open state (the off state in which the gap between the fixed contact 61 in the vacuum valve 6 and the movable contact 62 is open), the fixed contact 61 of the vacuum valve 6 and It is possible to check whether or not the degree of vacuum is healthy by applying an arbitrary voltage selected from the discharge voltage characteristics between the respective contacts to the movable contact 62 and checking whether or not a discharge occurs.

Specifically, when the electrode spacing between the contacts 61 and 62 is 6 mm (rated voltage 6 kV), it is determined that the degree of vacuum is abnormally lowered if a voltage of about 5 kV is applied and discharge occurs. To be done. However, even if the insulating cylinders 611 and 612 are deteriorated, the discharge voltage is reduced, so that it is not possible to reliably identify whether the deterioration is actually caused by the deterioration of the vacuum degree.

As described above, in the conventional vacuum degree monitoring device, in order to check the soundness of the vacuum degree, the disconnecting switch is operated inside the gas insulated switchgear to disconnect the vacuum valve from the main circuit, and any of the above-mentioned arbitrary It was investigated whether a discharge current flows by applying a voltage.

[0009]

As described above, the conventional vacuum degree monitoring device for a vacuum circuit breaker disconnects the vacuum circuit breaker from the main circuit when the soundness of the vacuum degree is judged (from the vacuum circuit breaker). It is necessary to take a power outage of a lower-order electric circuit), and a high-voltage power supply device for applying a voltage to the vacuum valve 6 is required, and whether the degree of vacuum is deteriorated or not even if discharge is judged to occur. Insulating cylinders 611 and 612 However, there is a problem that it is difficult to determine whether the deterioration has occurred.

The present invention has been made in order to solve the above-mentioned problems, and it is not necessary to take a power outage to check the vacuum degree of a vacuum valve, and a high-voltage power supply device is not required. It is an object of the present invention to provide a vacuum degree monitoring device for a vacuum circuit breaker, which can easily perform the above determination and reduce the work cost.

[0011]

According to a first aspect of the present invention, there is provided a vacuum degree monitoring device for a vacuum circuit breaker, comprising: A vacuum circuit breaker vacuum degree monitoring device that has a gas container for enclosing a vacuum valve in an insulating gas and opens and closes an electric circuit by opening and closing a contact. The detection unit that detects the spectrum of the arc light generated between the contacts of and outputs an electrical signal, and based on the electrical signal, determine that the vacuum level has dropped when the spectrum shows the bright line spectrum of the insulating gas. And a signal processing circuit section for outputting an alarm signal.

According to a second aspect of the present invention, there is provided the vacuum degree monitoring device for a vacuum circuit breaker according to the first aspect, wherein the insulating gas is SF ₆ and the detecting portion passes only the S and F emission line spectra. It includes a filter.

The vacuum degree monitoring device for a vacuum circuit breaker according to a third aspect of the present invention is the filter according to the first aspect, wherein the insulating gas is N ₂ and the detecting section is a filter which passes only the bright line spectrum of N _2. Is included.

Further, a vacuum degree monitoring device for a vacuum circuit breaker according to a fourth aspect of the present invention is characterized in that, in any one of the first to third aspects, the vacuum valve has two vacuum valves connected in series. The detectors are arranged in parallel for each vacuum valve, and the signal processing circuit unit determines the presence or absence of the bright line spectrum by taking the difference between the electric signals from the detectors.

[0015]

According to claim 1 of the present invention, the contact is opened (off).
Attention has been paid to the fact that the spectrum of the light generated from the arc between the contacts inside the vacuum valve sometimes changes due to the influence of the insulating gas component when the vacuum level drops, and the signal processing circuit unit that is the spectrum analyzer is not in contact with the main circuit. Install in a relationship. As a result, it is possible to determine whether the degree of vacuum is lowered by the spectrum of light generated by the arc between the contacts of the vacuum valve, and to monitor the degree of vacuum without contacting the main circuit.

According to the second aspect of the present invention, when the external insulating gas for enclosing the vacuum valve is SF ₆ ,
The deterioration of the degree of vacuum is determined by analyzing the bright line spectral components of S and F.

According to the third aspect of the present invention, when the external insulating gas for enclosing the vacuum valve is N ₂ , N ₂
The deterioration of the degree of vacuum is determined by analyzing the bright line spectrum component of.

According to claim 4 of the present invention, 2
Connect the two vacuum valves in series, detect the difference in the spectrum of the light generated from the arc between the contacts of each vacuum valve,
Determine the degree of vacuum deterioration.

[0019]

【Example】

Example 1. Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a main part configuration of a circuit breaker chamber of a gas insulated switchgear equipped with a vacuum degree monitoring device.
1 and 62 are the same as described above. In FIG. 1, 1 is a gas container in which SF ₆ gas GS is enclosed, and 2 is an opening provided in a part of the side wall of the gas container 1.

Reference numeral 3 denotes a resin-made sealed terminal provided in the opening 2, and has a built-in detection portion 3a for converting the incident light L into an electric signal E. The sealed terminal 3 is attached so as to make the opening 2 airtight, and at a position where the arc A generated between the contacts of the vacuum valve 6 can be observed. Reference numeral 5 denotes a signal processing circuit section that outputs an alarm signal H when the degree of vacuum deteriorates, and constitutes a degree-of-vacuum monitoring device together with the detector 3a. The output terminal of the detection unit 3 a is connected to the signal processing circuit unit 5 via the connection cable 4.

8 is an operating mechanism for driving the movable contact 62 in the vacuum circuit breaker 6, 9 is an insulating rod for transmitting the driving force of the operating mechanism 8 to the movable contact 62, and A is each contact 61 when the contact is opened. The arc L generated between the arc 62 and 62 is the light emitted by the arc A.

FIG. 2 is a block diagram showing a configuration example of the detection section 3a and the signal processing circuit section 5 in FIG. In FIG. 2, 31 is a filter that passes only the emission line spectra of S (sulfur) and F (fluorine) atoms, 32 is a detector that converts the light Lf that has passed through the filter 31 into an electrical signal E, and these are the detectors. 3a is configured.

Reference numeral 51 is a signal processing unit for processing and determining the intensity distribution of the electric signal E from the detector 32, and 52 is a signal processing unit 5.
It is an output device that generates an alarm signal H when the determination result of 1 indicates that the degree of vacuum is low, and these constitute the signal processing circuit unit 5.

FIG. 3 is a sectional view showing an example in which two vacuum valves 6 are connected in series. In FIG. 3, 30
Reference numerals 1 and 302 are two detection units having the same configuration as the detection unit 3a in FIG. 1, and are attached in parallel to the side wall of the gas container 1 corresponding to each vacuum valve 6. A signal processing circuit unit 500 processes the electric signals E1 and E2 from the detection units 301 and 302.

Next, the operation of the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. First, in the initial state, the contactor, that is, the fixed contact 61 and the movable contact 62 are closed (turned on).

In FIG. 1, when a contact opening command is input to a control device (not shown) in the operating mechanism 8, the operating mechanism 8 operates and its driving force is transmitted to the insulating rod 9 to cause a vacuum valve. The movable contact 62 in 6 separates from the fixed contact 61, and an arc A is generated between each contact 61 and 62.

At this time, if the vacuum degree of the vacuum valve 6 is normal, the emission spectrum of the arc A generated in the vacuum valve 6 is basically a spectrum centered on the electrode component Cu (copper). However, when the vacuum valve 6 becomes defective in vacuum and the SF ₆ gas GS in the gas container 1 enters the inside of the vacuum valve 6, the arc A generated between the contacts 61 and 62 becomes the SF ₆ gas GS arc.

In this case, the emission spectrum of the arc A contains S (sulfur) and F (fluorine) components in addition to the Cu (copper) component. Therefore, by determining whether or not the S and F spectral components are detected, the vacuum degree of the vacuum valve 6 can be determined to be defective.

Focusing on the above points, in order to detect only the emission spectrum components of the S and F atoms among the emission spectrum components of the arc A, as shown in FIG.
A filter 31 that allows only the emission line spectra of S and F atoms to pass through is provided therein. As a result, the detector 32 outputs the electric signal E only when the vacuum degree defect occurs.

The electrical signal E thus obtained is sent to the signal processing section 51, where noise and the like are separated and processing determination is performed. If the S and F bright line spectrum intensities are equal to or higher than a predetermined value, it is determined that the vacuum degree is defective, and the output device 52 outputs an alarm signal H to each external monitoring device (not shown).

As a result, it is not necessary to set a power failure state, and it is not necessary to prepare a power supply device, and it is possible to reliably monitor only the intrusion state of the SF ₆ gas GS, that is, the defective vacuum degree of the vacuum valve 6. it can. Also, the vacuum valve 6
Also, the deterioration of the insulating cylinder is not erroneously detected as a poor vacuum degree.
Therefore, the working cost is reduced and a highly reliable monitoring device can be realized.

Example 2. In the first embodiment, the vacuum valve 6 housed in the SF ₆ gas insulated switchgear is used.
In the case of a switchgear in which N ₂ (nitrogen) gas or another insulating gas is applied as the insulating gas instead of SF ₆ gas, for example,
By using a filter that passes the emission line spectrum of _two gases, the same effect as described above can be obtained. In this case, for example, the analysis capability in the signal processing circuit unit 5 as the analysis device may be set to a wide range so as to cope with the difference in the insulating gas.

Example 3. Further, although the case where only one vacuum valve 6 is installed is described in the first embodiment, the same effect can be obtained in a circuit breaker in which two vacuum valves 6 are arranged in series as shown in FIG. 3, for example. Can be obtained. In this case, in the signal processing circuit unit 500, the electric signals E from the two detection units 301 and 302 are
By taking the difference between 1 and E2 and comparing them, noise and the like can be easily removed, and a vacuum degree monitoring device for a vacuum circuit breaker with high detection accuracy and high reliability can be configured.

Embodiment 4 FIG. Although the filter 31 is provided in the detection unit 3a as the spectrum specifying unit, the filter 31 can be omitted if the signal processing circuit unit 5 has a spectrum specifying function.

[0035]

As described above, according to claim 1 of the present invention, a vacuum valve in which a pair of contacts facing each other so as to be able to come into contact with and separate from each other in a vacuum container are enclosed, and the vacuum valve is enclosed in an insulating gas. In a vacuum monitoring device for a vacuum circuit breaker that opens and closes an electric circuit by opening and closing a contact, the arc that is generated between the contacts inside the vacuum valve when the vacuum valve is opened. A detection unit that detects the spectrum of light and outputs an electric signal, and signal processing that outputs an alarm signal by determining that the degree of vacuum has decreased when the spectrum shows the bright line spectrum of the insulating gas based on the electric signal. Since the signal processing circuit part is installed in a non-contact relationship with the main circuit, it is not necessary to take a power outage to check the degree of vacuum and a high-voltage power supply device is not required, making it easy to determine the degree of vacuum. carry out DOO terms of can, the effect of vacuum monitoring device of a vacuum circuit breaker with reduced costs, such as maintenance work can be obtained.

According to a second aspect of the present invention, in the first aspect, the insulating gas is SF ₆ and the detecting portion is
Since a filter that passes only the S and F emission line spectra is included and the S and F emission line spectrum components are analyzed to determine vacuum degree deterioration, a highly reliable vacuum circuit breaker vacuum degree monitoring device is obtained. It is effective.

According to a third aspect of the present invention, in the first aspect, the insulating gas is made of N ₂ and the detecting portion is made of N ₂
Including a filter that passes only the emission line spectrum of
_{Since the} deterioration of the degree of vacuum is determined by analyzing the bright line spectrum component of ₂ , there is an effect that a highly reliable vacuum degree monitoring device for a vacuum circuit breaker can be obtained.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the vacuum valve has a configuration in which two vacuum valves are connected in series, and the detection section is Since two signal processing circuit units are arranged in parallel corresponding to the vacuum valves and the presence or absence of the bright line spectrum is determined by taking the difference between the electric signals from the respective detection units, a vacuum circuit breaker with higher reliability. There is an effect that the vacuum degree monitoring device can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main part configuration of a circuit breaker chamber of a gas insulated switchgear according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a specific configuration example of a detection unit in FIG.

FIG. 3 is a cross-sectional view showing a main part configuration of a circuit breaker chamber of a gas insulated switchgear according to a third embodiment of the present invention.

FIG. 4 is a cross-sectional view showing the internal structure of a vacuum valve housed in a conventional gas-insulated switchgear.

FIG. 5 is a characteristic diagram showing changes in discharge voltage between the ground and the electrodes with respect to the degree of vacuum of a general vacuum valve.

[Explanation of reference numerals] 1 gas container, 3a, 301, 302 detection unit, 5 signal processing circuit unit, 6 vacuum valve (vacuum circuit breaker), 31
Filter, 32 detector, 51 signal processing unit, 52 output device, 61 fixed contact (contact), 62 movable contact (contact), 611, 612 insulating cylinder (vacuum container), 6
13 Metal tube (vacuum container), A arc, E, E1, E
2 Electrical signal, GS insulating gas, H alarm signal, L arc light.

Claims (4)

[Claims] 1. A contactor having a vacuum valve enclosing a pair of contactors facing each other so that they can be contacted and separated in a vacuum container, and a gas container for enclosing the vacuum valve in an insulating gas. In a vacuum degree monitoring device for a vacuum circuit breaker that opens and closes an electric circuit by opening and closing, an electric signal is detected by detecting a spectrum of arc light generated between contacts in the vacuum valve when the vacuum valve is opened. And a signal processing circuit unit that outputs an alarm signal by determining that the degree of vacuum has decreased when the spectrum shows the emission line spectrum of the insulating gas based on the electric signal. A vacuum degree monitoring device for vacuum circuit breakers. 2. The vacuum degree monitor of a vacuum circuit breaker according to claim 1, wherein the insulating gas is SF ₆ , and the detection unit includes a filter that passes only the S and F emission line spectra. apparatus. 3. The vacuum degree monitoring device for a vacuum circuit breaker according to claim 1, wherein the insulating gas is made of N ₂ , and the detection unit includes a filter that passes only the emission line spectrum of N _2. . 4. The vacuum valve has a configuration in which two vacuum valves are connected in series, two detection units are arranged in parallel corresponding to each vacuum valve, and the signal processing circuit unit is 4. The vacuum degree monitoring device for a vacuum circuit breaker according to claim 1, wherein the presence or absence of the bright line spectrum is determined by taking a difference between electric signals from the respective detection units.