JPS60225039A - Vacuum degree detection apparatus of vacuum breaker - Google Patents

Abstract

PURPOSE:To make it possible to detect the vacuum degree of a vacuum valve during the supply of a current, by using a coaxial cable as the output wire connected to a discharge detector and coaxially providing a conductor connecting an earthing electrode and a ground potential part to the outer periphery of said cable. CONSTITUTION:A discharge detector 6 using an elastic wave piezoelectric sensor and an earthing electrode 7 close to said detector 6 are attached to the outer peripheral surface of an insulating cylinder 1 and the outlet wires of the detector 6 and the electrode 7 are connected to one terminal of a coaxial cable 9. The cable 9 is formed by coaxially arranging the core wire 10 coming to the output wire of the detector 6 and a shield 11 through an insulating layer 12 and further providing a shield 13 and an insulating layer 14 to the outer periphery of said insulating layer 12. When a vacuum degree is lowered during the supply of a current to a vacuum valve, discharge is generated between electrodes 4a, 4b and the electrode 7 and charged particles are impinged to the shield 5 or the cylinder 1 to generate minute collision sound. This collision sound is converted to an electric signal by the detector 6 while said electric signal is transmitted to a control apparatus through the core wire 10 and the shiel 11 of the cable 9 to perform display, alarm or the detachment of the vacuum breaker.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The invention is directed to the sound and longitudinal waves generated by a vacuum breaker (two strands, two vacuum pulps).

Improvement of the output line that detects changes in the magnetic field, etc. using the vacuum pulp (= installed magnetic discharge detector and grounding 44111) (2t! lr
Ru.

[Technical Background of the Invention and Points of Interest 3: From the perspective of Nakuchi (=, the vacuum breaker exhibits a predetermined performance (= means that the degree of vacuum of the vacuum pulp is maintained within a predetermined 1@-(2) By the way, conventional methods for detecting the vacuum fft of vacuum pulp after it has been used include (1) measuring the pressure resistance inside the vacuum valve; (2)
Vacuum Shiju I! Measurement of the magnetic pressure generated when the R machine is open (2nd load side) was adopted as appropriate.

However, none of these methods can rely on vacuum shielding detection when the vacuum breaker is in a bad condition, so if 1 =
When the degree of vacuum decreases (secondly, in this decreased state, the magnetic current must be placed in one place), but it is not possible to shut off the 4th flow because the breaking performance has deteriorated (3-phase In the case of regenerator, the other phase cuts off 4ft, so it appears that even vacuum pulp, which has a lower degree of vacuum, cuts off the magnetic current (= it appears).

Therefore, making it possible to detect the degree of vacuum in the vacuum pulp during one magnetization greatly improves the reliability of the vacuum breaker.

In recent years, advances in Senna technology have made it possible to extract signals from minute physical phenomena.

Therefore, a method of detecting the degree of vacuum by extracting signals from various phenomena that occur when the vacuum pulp is energized (= when the degree of vacuum decreases) is also being considered, and the present applicant also investigated the method of detecting the degree of vacuum by We proposed a method of installing an i++-2 4L side extractor outside the insulated cylinder that constitutes the pulp vacuum container.

By the way, since the signal from the detector in such a method is minute, in the high-pressure 04 power system to which the vacuum breaker is connected, there are four output lines (two wires) from the detector to the control device including the amplifier. The noise that is thought to be caused by induction (= is was desired.

[Purpose of the invention]

The invention is to increase the degree of vacuum of the vacuum pulp in the two-dimensional process.
An object of the present invention is to provide a vacuum degree detection device for a vacuum shield device that is capable of detecting degree of vacuum.

[Summary of the invention]

The present invention provides a pair of ilE poles that can be connected freely to the inside of the vacuum vessel S (= end plates) provided at both ends of the insulating cylinder (= end plates), and a pair of ilE electrodes that are freely connected to the outside of the insulating cylinder (= end plates). The vacuum level detection device of the vacuum breaker installed [+2, the discharge detector (2) The output line to be connected is a coaxial cable, and the outer circumference of this coaxial cable (2 coaxially connects the ground magnetic pole and the earth positioning part) By providing a conductor, the electric current from the discharge detector can be removed.
This is designed to reduce the noise that is superimposed on the external noise.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to two drawings.

() Figures 1 and 2 (2) Insulating cylinder 1 and both 4 (
=Inside the vacuum container 3 composed of the provided end plate 2.2 (the second is a pair of electrodes 4a and 4b which can be freely brought into contact and separated,
A shield 5 is provided around the electrodes 4a, 4b. In addition, the outer circumferential surface of the insulating layer @1 (= is the discharge 11 using an acoustic wave piezoelectric sensor & detector 6 and this discharge (a grounded IIE pole 7 is installed near the detector 6, and this grounded 4 pole 7 and discharge detection The device 6 is coated with an insulating layer 8.The output wire of the discharge detector 6 and the grounding 4-pole 70 wire are connected to one end (two ends) of a coaxial cable 9, which will be described in detail later. The other end of 9 is connected to a control device (not shown) including an amplifier. The coaxial cable 9 is connected to the core @io which becomes the output line of the discharge detector 6, as shown in FIG. 7 - The lead 11 is coaxially arranged (2 devices, and between the core #10 and the shield 11 (; an insulation node 12 is provided, and the outer f41 of this insulation node 12 is connected to the ground 4E pole 7 ('- connected). The shield 13 is coaxial with the core lO and the shield 11, and the outer periphery of the shield 13 (=##414) is provided and covered.
One end of 3 is connected to a grounding part such as a frame made of metal material of the vacuum breaker.

Next, we will explain the method for detecting the degree of vacuum according to the above configuration.
4b and the ground magnetic pole 70 (2, shield 5, Kffl 4
a, 4b or 7- The charged solder particles generated from the shield 5 collide with the shield 5 or the insulating cylinder 1 (= = generate a minute collision sound. This collision sound propagates through the insulating cylinder 1, and the discharge detector 6 and is converted into a nausea signal (2) by the discharge detector 6. This converted signal is transmitted to a control device (not shown) including an amplifier via the core wire 10 of the coaxial cable 9 and the shield 11, and the degree of vacuum is determined. If the drop exceeds a predetermined range or value (2), display a warning externally, and if necessary (2) remove the vacuum shutoff unit or control related equipment.

There is a well-known characteristic known as the Paschen curve as shown in Figure 3 (= dielectric strength voltage in vacuum). As the dielectric strength decreases, the dielectric strength increases again. Therefore, the discharge current between the magnetic poles 4a and 4b and the grounding pole 1 is as shown in the same figure (as shown by the dotted line (the characteristic of a double peak). Therefore, as the degree of vacuum decreases and the dielectric strength voltage reaches its minimum value, [
There is a tendency for C2 to increase as the area of the pole 70 increases. This phenomenon is thought to be caused by the charge stored in the stray capacitance generated between *jtmmE47 and the magnetic poles 4 & 14b being released. In other words, the capacitance C of the 24-pole open circuit is expressed by the following equation (1). There is a relationship to show.

0~foot・・・・・・(1) Here, the area of the 5rilL pole and d indicate the distance between the magnetic poles.

In addition, the capacitance C (capacitance Q that can be added) is calculated by the following equation (2).

Q −eV (2) Here, ■ indicates the cap position difference between the 4E poles. Qing Q and Ho 4E
<Since AI is almost proportional, unlimited 11L flow is (1).

12) From the set, there is the relationship shown in the following equation (3).

""r...tsu3) From this equation (3), as the other area increases, aalE4E
It can be seen that the flow increases. However, equation (3))
2 The area S shown is the effective area, and when the electrode structure is complex like vacuum pulp, even if the area of the ground IIL 7 is simply increased, the effective area does not increase proportionally;
Although saturation occurs as shown in Figure 2, equation (3) holds true in the region of 100 t and m degrees for a vacuum breaker with a medium capacity or less. The radiation 4E4A increases, the sound of the particle colliding with the insulating cylinder 1 also becomes louder, and as a result, the output signal of the second radiation detector 6 also increases.

On the other hand, if the number of shields is used as a back meter, the noise induced in the core wire of a coaxial cable will be as shown in diagram s5.

From this, it can be seen that the noise to the core wire is significantly reduced as the number of shields increases.If the coaxial cable is perfectly shielded, only one lead layer is required (2), but in reality ( Second, it is impossible to provide a complete shield, so it is important to have multiple shield layers.
It is practical and the production cost is low.

As described above, since the output line of the C2 discharge can detector 6 and the connection line of the ground magnetic pole 7 are coaxially integrated, the degree of vacuum of the vacuum pulp during magnetization can be detected with 1% accuracy (= ,
A! Installation and wiring to the circuit breaker is also extremely easy.

(Effects of IIA Akira) As described above, since the present invention has two configurations, the degree of vacuum of the vacuum pulp during energization can be configured with high precision, and the pipe filling of the operation of the member fl@ can be made easy. can.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of vacuum pulp according to the present invention (Second Edition).
The figure is a cross-sectional view of the main part of an example of this @mei, Figure 3 is a curve diagram showing the relationship between the degree of vacuum, dielectric strength and unlimited magnetic current of vacuum pulp, and Figure 4 is a diagram showing the relationship between the vacuum pulp and the dielectric strength and unlimited magnetic current. FIG. 5 is a curve diagram showing the relationship between the number of shields of a coaxial cable and the magnetic pressure induced in the core wire. l...Insulating container, 3...Vacuum container 4
a, 4b...Magnetic pole, 6...Number of songs I4f! IL
Output device 7...Ground magnetic pole, 9...Four coaxial couple 111,,,,,jtai ugly 111A,,,-,,J
]m-L”13,15・Curve・Insulating layer (8733) Agent Patent attorney Yoshiaki Inomata (Haga1
Figure 1 Figure 3 Figure 111-1

Claims (1)

[Claims] (1) Both ends of the insulating cylinder (two-end plates) were provided inside the vacuum vessel, and a pair of four others were provided, and an IQN two-radius detector and a ground magnetic pole were provided outside the insulating cylinder. In the vacuum level detection device of the vacuum breaker, the output line connected to the magnetic discharge detector (2) is a coaxial cable, and the outer periphery of this coaxial cable (= coaxial shape (211tI) ground area and other A vacuum level detection device for a vacuum breaker, characterized in that a connecting conductor is provided. #!F
A vacuum degree detection device for a vacuum breaker according to claim 1.