JPS5894727A - Vacuum degree monitor for vacuum breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Book S! I am referring to the vacuum level monitoring device for the vacuum interrupter.In general, the vacuum breaker
It has normal breaker ability at pressures below r, but this degree of vacuum can cause gas released from inside the breaker and #! K deteriorates due to slow leakage from fitting parts such as soldering and brazing, and the interruption ability decreases. For this reason, vacuum cutoff @
It is essential to monitor the degree of vacuum in order to guarantee performance.

Therefore, in the past, a discharge electrode was provided inside the vacuum breaker, a high voltage was applied to the vacuum breaker, and the degree of vacuum was checked by changing the discharge state from the vacuum fK. However, with this method, the structure of the vacuum breaker would have to be 11K, and a separate high voltage power supply would have to be prepared, resulting in a high 11itlK power supply.
Furthermore, when checking the degree of vacuum, it is necessary to disconnect the vacuum breaker from the T-circuit, which is very troublesome.

The present invention eliminates the above-mentioned drawbacks, does not require a discharge electrode or a separate high-voltage power source, and can check the degree of vacuum while the interrupter is connected to the circuit. It is an object of the present invention to provide a vacuum f monitoring device alt for a vacuum interrupter that can be easily and inexpensively checked.

The following is a description of the vacuum breaker according to the embodiment of the present invention. The location monitoring device will be explained with reference to the drawings.

FIG. 1 shows an ag1 embodiment of the present invention, in which / is a tank in which a vacuum shield and disconnector, which will be described later, is housed, and insulating oil is injected into the tank. The tank ltI'i is formed of a metal plate such as an iron plate or a stainless steel plate. C is a bushing, 3 is an external connection conductor connected to the movable and fixed electrode of the vacuum breaker, and D is a frame on which the tank is placed.

A receiving antenna j is placed near the external connection conductor 3.
l This antenna 5 is connected to the detector 7 via the connection fIIIB.
is connected.

The detector 7 is composed of an enlarged part j0 determination part, a power supply part IO, and a display part //.

Figure 1 shows the details of the detector 7, where / is the detector detected by the antenna S, a buffer amplifier that increases the signal, and
/Jri buffer amplifier This is an amplifier that amplifies the output signal of /Jri. /4I- is the first ratio [6, /jtlIIl] which compares the amplified output value number of amplifier /3 with a predetermined reference voltage; A second comparator further compares the signal to a predetermined reference voltage.

Figure 2 shows nine vacuum circuit breakers housed within the tank.
Vacuum breaker/7#i metal end plates on both ends of the insulation board/9. X) T-Attach to form a vacuum container, end plate/9V
At the same time, a movable lead ring is movably inserted into the end plate through a bellows 2.2, and a fixed electrode is attached to the tips of the identification lead ring and the movable lead ring. Attach the movable electrode j to the middle of the edge/J, and the edge/J. Install the shield.

In the above II self-assembly, the vacuum breaker l) moves a movable force to a not-shown device, and generates a force of 1 billion J.

The equivalent circuit in the cut-off state of the vacuum breaker/) is shown in FIG. 1 and FIG. 8. In the figure, 27.4 is the power supply and load of the circuit in which the vacuum shield is installed, respectively, and 9.30 is the resistance and capacitance of the direction and the shielding capacity, respectively. /, J are the resistance and capacitance between the movable electrode d and the shield, jJa and JJb are the resistance of the insulating tube/l, respectively, 3rd is the capacitance between the shield and the ground, and Jj and JJ are the respective resistance and capacitance between the shield and the shield. These are the resistance and capacitance between electric poles and j in the interrupted thigh. When the degree of vacuum inside the vacuum breaker/7 deteriorates and the internal pressure rises, the #J11IL rate in the vacuum and the paddy electricity rate in the atmosphere are almost mixed, so the capacitance is 30.3,
34. The resistance does not change much, but the resistance f, ? /,
Jji! Due to Paschen's law, it decreases significantly. For this reason, between the shield and the valley electrode, which are insulated from any of the fixed and =T motions and have a floating potential, regardless of the closed state and the In addition, discharge occurs only in the cut-off state between 4j and 4j. This discharge occurs even if the cable is connected to the load side, and even if the load is connected to the load or the lead of the vacuum breaker is only connected to the capacitor lid.

In order to measure the quality of the vacuum pulp in a tank-type vacuum breaker where all the meat is waxed on a plate or stainless steel plate, the vacuum breaker 'rFW44m! do. When the degree of vacuum deteriorates, a sudden discharge occurs according to Paschen's law. During this discharge, a signal of % is transmitted to the application line or the conductor on the negative # side. This No. m is detected by the detection unit at the point where it leaks out from the conductor coming out of the bushing outside the tank, and it is judged whether the vacuum level of the vacuum valve is good or bad.

6(B) shows the pressure received by the antenna 5 when the degree of vacuum of the vacuum interrupter 17 is normal. In this case, the voltage waveform between V and j is a sine wave, and no signal is input to the antenna jVl-. Voltage between poles and reception of antenna j when the degree of vacuum of vacuum breaker 17 deteriorates!
When discharge begins, the interelectrode voltage between the two electrodes does not rise above a certain voltage and ripples, as shown in FIG. 6(A). Figure 6 (B) at the start of this ripple
A pulse-like signal is generated as below, and by detecting and judging this signal, it is possible to detect the deterioration of the degree of vacuum in the vacuum chamber wI'rW/7. In this case, even if corona discharge occurs in a portion other than the threshold, the gI waveform is different, so the conventional characteristics are not affected.

In a vacuum, when the altitude of the device 170 is degraded, when the antenna j receives a pulse-like signal, the buffer amplifier l amplifies it and outputs an output signal of 8sk as shown in Fig. 4e. 0 amp 13tfi emitting 3w1l
Then, the amplified signal 8 keys are input to the first comparator.

The first comparator/Hiro compares the signal sl with a predetermined reference voltage to obtain f! No. 8S is input manually to the integrator 15. The integrator 15 integrates the deviation signal of the first comparator/4' and inputs the output No. 16 day 4 to the second comparator/4 05442
The comparator No. 111 S4 is set to a predetermined reference voltage and the deviation voltage A is outputted as No. 8s to create a 1# alarm or a six-point alarm, and deterioration in the vacuum is detected.

Based on the experimental measurement results, when a vinyl covered cable with a length of 50 mm and a cross-sectional area of 2 mm is used for antenna 5, the IIIK antenna S is placed at a distance of 50 mm from the bushing. As shown in the figure, a 1m vacuum breaker/is housed in the oil film 37.The vacuum f of this vacuum breaker/is α8To.
When rr, the contact is opened and 4″t (126μ
This capacitor 31 is of class a&#i and has a voltage equivalent to 17 mK of the lead wire. When is applied, a discharge occurs at the electric pipe, and a signal generated at the time of discharge reaches the external connecting conductor 3 through the bushing. This signal is received by the antenna j, amplified by the detector 7, and the JIC empty casing deterioration report 1 is displayed.

pM Kamo-go is at the above voltage with a gain of 10.000 (14
It becomes V.

During ecstasy, a discharge occurs between the first lead and the intermediate shield with a floating potential, but unlike when the contact is opened, a weak signal is emitted into the air through the bushing and external connection conductor. . Therefore, the degree of vacuum in the vacuum pulp when the contact is closed can be determined by connecting the floating intermediate shield of the vacuum breaker and the tank wall (earth) with a capacitor, so that the measurable signal is the same as when the contact is open. Since it comes out, you can judge the success or failure of the vacuum level.

Figures 8 and 9 respectively show other embodiments of the present invention. In the vacuum level monitoring device shown in Figure 8, the entire surface is covered with a metal plate such as an iron plate or a stainless steel plate. The reduced type switchgear 32 has a built-in vacuum breaker. An external follower conductor 3 protrudes from the outside of the switchgear 3t through the bushing 2. An antenna J is arranged near these push-pulls or external connection conductors J. In addition, in the vacuum level monitoring device shown in Fig. ig9, the antenna j and the detector 7 are placed near the 8-phase spacer of the substation 3t. Examples and various effects.

Effects can be obtained.

Conventionally, the quality of the vacuum of the vacuum pulp in a tank-type vacuum breaker has been determined by draining the insulating oil or insulating gas in the oil tank or gas tank, and then measuring the distance between the electrodes of the vacuum pulp for a pressure test. 111jil, applied a voltage, and investigated using the withstand voltage method. /c handicap was required and human error occurred when returning to 1, but according to the present invention, the vacuum breaker tIN4 can be opened without any manipulation of the oil tank or gas 4m, and when the vacuum level deteriorates, Paschen According to the law of the law, the electric discharge notes generated from the electric discharge bushing and the applied solution are received by the receiving antenna, and the good signals received by this antenna are electrically processed to detect the deterioration of the degree of vacuum. This advantage is that there is no need to remove the vacuum breaker from the circuit when detecting vacuum deterioration, and there is no need to install a separate high-voltage power supply due to the structure of the vacuum breaker. O that can easily and inexpensively accurately detect vacuum deterioration

[Brief explanation of the drawing]

Fig. 1 is a front view of a tank-type interrupter equipped with a vacuum level deterioration side fill'ft of a vacuum interrupter according to an embodiment of the present invention, and Fig. 2 is a front view of a tank-type interrupter equipped with a side fill'ft of vacuum interrupter according to an embodiment of the present invention. Fig. 8 is an equivalent (b) schematic diagram of the vacuum breaker in Fig. f42, Fig. jI4 is a block diagram of the detector, Fig. 5
6 and 6 are operational waveform diagrams of the tank lid interrupter shown in FIG. 1, and t! Figure 7 is a longitudinal sectional front view of a vacuum interrupter used experimentally, and Figures 8 and 9 are diagrams of a vacuum level deterioration monitoring device for a vacuum interrupter showing other embodiments of the present invention. Front view O/...Oil tank, Co...Bushing, 3
...External connection conductor, j...Antenna, 7...Detector, /F...Vacuum interrupter, 39...Reduction type switchgear, -...8 phase spacer 0 Fig. 3 Figure 4 Figure 5 Figure 8 Procedural amendment (voluntary) April 5, 1980 To the Commissioner of the Japan Patent Office 1986 Patent No. 1111178890 2 Title of invention 1 Vacuum level monitoring device for air breaker 3 Amendment Applicant (610) Meidensha Co., Ltd. 4, Agent Address: 1-29 Akashi-cho, Chuo-ku, Tokyo 104 Contents of the amendment to the Kisaikai Building (11 specifications, page 7, $18 Correct it to ``at the leaking position'' in line 11f at the position where fiA is leaked.
Correct to "Electric power cable". Procedural Amendment (Voluntary) 1975D1-January 11 ['' To the Commissioner of the Japan Patent Office1, Display of 11 cases 1986 Patent - Rattan No. 1788902, Title of invention Vacuum Interruption IIO Vacuum 1m Viewing Device 3, Amendment Applicant (610) Meidensha Co., Ltd. 4, Agent Address: 1-29 Akashi-cho, Higashizenchuo-ku, 104-; Detailed description of the invention before specification and drawings. a Contents of amendment (1) Details! (Detailed explanation of the invention)
[Attachment] (1) (A) In the 6th line of page 6 of the specification, the phrase "between the shield base and the earth" is corrected to "between the shield base and the ground potential (for example, tank/)". (1) (B) In page 6, line 12 of the specification, the phrase "significantly affected by Paschen's law" is corrected to "significantly affected by the precursor phenomenon influenced by Paschen's law." (11(c) From line 4 to line 6 of page 7 of the specification,
``Connection, . . . . . . also occurs with capacitance.'' is replaced by ``Connection, . . . . . .
and correct it. (1)) On page 7, line 10 of the specification, the phrase ``discharge occurs between multiple poles according to Engn's law'' is replaced with ``discharge occurs between multiple poles due to a precursor phenomenon influenced by Engn's law.'' Dark discharge occurs.'' (t+(＠ In the statement j117, line 18, the phrase ``conductor leaks outside IIK'') is replaced with ``conductor outside IIK''.
Correct it to "m position". (1) (c) In the specification, page 1, column 2, line 2 FAK, the phrase ``oil film as shown in figure 6 of iris'' is corrected to ``oil tank as shown in figure 7.'' (1) ()) In the 4th line of page 11 of the 911 Specification, the phrase ``the true 9 degree of the pulp'' is corrected to ``the true g! degree of the interrupter''. (1) - In the 10th line of page 7 of the specification, the phrase "applied. By the withstand voltage method" is corrected to "applied, by the withstand voltage method according to Paschen's law." (11 (!J) In the fourth line of page 7 of the specification, the phrase ``according to Paschen's law'' is amended to ``according to the precursor tax phenomenon affected by Paschen's law.''

Claims (1)

[Claims] In a vacuum breaker that causes internal discharge when the degree of internal vacuum deteriorates, an antenna is provided near an external conductor of a grounding container in which the vacuum interrupter is housed, and receives a discharge signal caused by the internal discharge. , a vacuum position determination section electrically connected to the antenna and determining whether the degree of vacuum is good or bad based on the signal received by the antenna, and configured to detect deterioration of the degree of vacuum based on the output of the vacuum degree determination section O. What I did was to vacuum the 41I mold and use the interrupter vacuum and monitoring equipment.