JPH08304470A - Switch with built-in sensor - Google Patents

Abstract

PURPOSE: To provide a switch with a built-in sensor which can correctly measure a voltage of a power distribution line irrespective of whether the switch is opened/ closed. CONSTITUTION: The switch is provided with a fixed contact element 4 set in a container 1 of the switch, a movable contact element 5, a cylindrical extinction body 7 of a conductive material surrounding the movable contact element 5 in a loop, a capacitive voltage divider 12 consisting of an inner cylindrical ring set in the outer periphery of the movable contact element 5 and extinction cylindrical body 7, an insulating material 14 in tight contact with the outer periphery of the inner cylindrical ring, and an outer cylindrical ring 15 in tight contact with the outer periphery of the insulating material 14, and a voltage detection device for detecting an output voltage of the capacitive voltage divider 12. The capacitive voltage divider 12 comprises a first inner cylindrical ring 16 and a second inner cylindrical ring 17 which are made of a conductive material, faced to an arc drive coil 10 wound in the outer periphery of the extinction cylindrical body 7 and arranged via an interval in an axial direction of the extinction cylindrical body 7 to surround the ring-shaped space, a conductor 18 connecting the second inner cylindrical ring 17 with the outer cylindrical ring 15, and a conductor 19 connecting the outer cylindrical ring 15 to the container 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch with a built-in sensor which has a function of measuring the voltage of a high voltage power distribution line.

[0002]

2. Description of the Related Art Conventionally, a switch with a built-in sensor having a function of measuring the voltage of a high-voltage distribution line has, for example, as shown in FIG. 3, bushings 2 and 2 on both sides of a switch container 1 in which an insulating gas is sealed. 'Is attached. One bushing 2
A fixed electrode 3 is fixed to the fixed electrode 3, and a fixed contact 4 is provided at the tip of the fixed electrode 3 inside the switch container 1. The other bushing 2'is provided with a movable contact 5 that comes in contact with and separates from the fixed contact 4 so that it can slide on a movable electrode (not shown). The fixed electrode 3 and the movable electrode are wired to the outside by lead lines 6 and 6 '. Reference numeral 7 denotes a cylindrical arc-extinguishing cylinder made of a conductive material that surrounds the movable contact 5 in an annular shape. The arc-extinguishing cylinder 7 has a conductive ring 8 projecting toward the fixed contact 4 and is made of an insulating material. It is attached to the fixed electrode 3 via 9. Reference numeral 10 is an arc drive coil wound around the outer circumference of the arc-extinguishing cylinder 7, one end of which is the arc-extinguishing cylinder 7.
The other end is connected to the fixed electrode 3, respectively. 11
Is an arc extinguishing gas such as SF ₆ gas sealed in the switch container 1. Reference numeral 12 is a capacitive voltage divider installed in the switch case 1, and includes an inner cylindrical ring 13 made of a conductive material and provided in the arc drive coil 10 so as to surround the annular space, and the inner cylindrical ring 1.
The outer cylindrical ring 15 made of a conductive material is attached to the outer periphery of the outer peripheral surface of the outer ring 3 through an insulating material 14. The outer cylindrical ring 15 is grounded to the switch container 1 via a conductor 19. Therefore, a high voltage side capacitance C ₁ is formed between the surface of the arc drive coil 10 and the inner cylindrical ring 13, and a low voltage side capacitance C ₂ is formed between the inner cylindrical ring 13 and the outer cylindrical ring 15. . Two
Reference numeral 0 is a voltage detection device including an optical sensor, which is an inner cylindrical ring 13
The conductor 2 to one end of the voltage application terminal of the voltage detection device 20.
1, and the switch case 1 and the other end of the voltage application terminal of the voltage detection device 20 are connected by a conductor 22. Further, the voltage detection device 20 and a signal processing unit (not shown) are connected by an optical fiber 23. Reference numeral 24 is a support member that supports the capacitive voltage divider 12 on the switch container 1. Therefore, the voltage between the inner cylinders 13 with respect to the ground potential is detected by the voltage detection device 2
In the case of detecting with 0, an optical voltage sensor utilizing, for example, the Pockels effect is used for the voltage detection device 20, and when the voltage between the inner cylinders 13 with respect to the ground potential is applied to the optical voltage sensor, the change in the light intensity according to the applied voltage Detected as.
Since the capacitance division ratio of the capacitances C ₁ and C ₂ is constant, the capacitance type voltage divider 12 detects the capacitance C ₂ on the low voltage side to indirectly determine the capacitances C ₁ and C _2. The voltage on the high voltage side is detected (for example, Japanese Patent Laid-Open No. 63-1
95576).

[0003]

However, in the prior art, when the switch is opened, that is, when the movable contactor 5 is separated from the fixed contactor 4, the movable contactor 5 has a zero potential. The influence of the electrostatic capacitance existing between the movable contactor 5 and the inner cylindrical ring 13 disappears, and the voltage appearing in the inner cylindrical ring 13 becomes lower than that when the circuit is closed, so that a voltage detection error occurs. was there. . The present invention
An object of the present invention is to provide a switch with a built-in sensor that can accurately measure the voltage of a distribution line regardless of whether the switch is open or closed.

[0004]

In order to solve the above-mentioned problems, the present invention provides a fixed contactor provided in a switch case in which an insulating gas is sealed, and a movable contactor capable of coming into contact with and separating from the fixed contactor. And an arc-extinguishing cylinder of a cylindrical body made of a conductive material surrounding the movable contact in an annular shape, an inner cylindrical ring provided on the outer periphery of the movable contact and the arc-extinguishing cylinder, and insulation closely attached to the outer periphery of the inner cylindrical ring. Switch with built-in sensor, which comprises a capacitive voltage divider composed of a cylindrical material and an outer cylindrical ring in close contact with the outer periphery of the insulating material, and a voltage detection device for detecting the output voltage of the capacitive voltage divider, The voltage divider is made of a cylindrical conductive material that faces the arc drive coil wound around the outer circumference of the arc extinguishing cylinder and surrounds the annular space and is provided at intervals in the axial direction of the arc extinguishing cylinder. An inner cylindrical ring and a second inner cylindrical ring, and the second inner A conductor for connecting the cylindrical ring and an outer cylindrical ring, is made of a conductor for grounding said outer cylindrical ring switch container. The capacitive voltage divider includes a third inner cylindrical ring on the fixed contact side of the first inner cylindrical ring, and a conductor connecting the third inner cylindrical ring and the outer cylindrical ring. It is a thing. The voltage detection device is an optical sensor that detects a voltage between the first inner cylindrical ring and the ground.

[0005]

With the above means, when the switch is closed, the movable contact comes into full contact with the fixed electrode, and the movable contact becomes a high voltage portion. Therefore, the surface of the arc drive coil and the first inner cylindrical ring and High-voltage side capacitance C with the second inner cylindrical ring
Not only ₁₁ and C ₁₂ , but also the high-voltage side capacitance C ₁₃ is formed between the movable contactor and the second inner cylindrical ring. Also, the third
If there is an inner cylindrical ring, a high voltage side capacitance C ₁₄ is formed between the surface of the arc drive coil and the third inner cylindrical ring. However, since the first inner cylindrical ring, the second inner cylindrical ring, and the third inner cylindrical ring are separated, no electrostatic capacitance is formed between the movable contactor and the first inner cylindrical ring. . Further, since the second inner cylindrical ring and the third inner cylindrical ring are grounded, they function as a shield, and the first inner cylindrical ring has a high-voltage side capacitance C ₁₁ which is always a constant value. Therefore, the influence of the electrostatic capacitance of the movable contactor when the switch is opened and closed can be prevented from affecting the first inner cylindrical ring. That is, since a capacitance that fluctuates due to the opening and closing of the movable contactor and the fixed contactor is not formed between the first inner cylindrical ring and the movable contactor, the opening / closing operation of the switch is It does not affect the measured voltage detected by the voltage detection device between the inner and outer cylindrical rings.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a side view showing a first embodiment of the present invention, a part of which is shown in section. In the figure, 1 is a switch container, and bushings 2 and 2'are attached to both sides thereof.
A fixed electrode 3 is fixed to one bushing 2, and a fixed contactor 4 is provided at the tip of the fixed electrode 3 inside the switch container 1. The fixed contactor 4 is attached to the other bushing 2 '.
A movable contact 5 is attached to and detached from the movable electrode 5 so that it can slide on a movable electrode (not shown). The fixed electrode 3 and the movable electrode are wired to the outside by lead lines 6 and 6 '. Reference numeral 7 denotes a cylindrical arc-extinguishing cylinder made of a conductive material that surrounds the movable contact 5 in an annular shape. The arc-extinguishing cylinder 7 has a conductive ring 8 projecting toward the fixed contact 4 and is made of an insulating material. It is attached to the fixed electrode 3 via 9. 1
Reference numeral 0 denotes an arc driving coil wound around the outer circumference of the arc extinguishing cylinder 7, one end of which is connected to the arc extinguishing cylinder 7 and the other end of which is connected to the fixed electrode 3. 11 is an SF enclosed in the switch container 1.
Arc-extinguishing gas such as ₆ gas. Reference numeral 12 denotes a capacitive voltage divider installed in the switch container 1, which is a first cylindrical electrically conductive member provided in the arc drive coil 10 so as to surround the annular space and be arranged at intervals in the axial direction of the arc extinguishing cylinder 7. Inner cylindrical ring 16
And a second inner cylindrical ring 17, and an outer cylindrical ring 15 made of a conductive material attached to the outer circumferences of the first inner cylindrical ring 16 and the second inner cylindrical ring 17 via an insulating material 14. The inner surface of the first inner cylindrical ring 16 is the arc drive coil 1
Although the entire surface faces 0, the inner surface of the second inner cylindrical ring 17 mostly faces the movable electrode 5.

As a result, a high-voltage side capacitance C ₁₁ , between the surface of the arc drive coil 10 and the first inner cylindrical ring 16,
A high voltage side capacitance C ₁₂ is provided between the surface of the arc drive coil 10 and the second inner cylindrical ring 17, and a high voltage side capacitance C ₁₂ is provided between the surface of the movable contact 5 and the second inner cylindrical ring 17. Form C ₁₃ . A low voltage side capacitance C ₂ is formed between the first inner cylindrical ring 16 and the outer cylindrical ring 15. Further, the second inner cylindrical ring 17 and the outer cylindrical ring 15 are connected via a conductor 18, and are further grounded to the switch case 1 via a conductor 19. Reference numeral 20 is a voltage detection device including an optical sensor,
The first inner cylindrical ring 16 and one end of the voltage application terminal of the voltage detection device 20 are connected by the conductor 21, and the switch case 1 and the other end of the voltage application terminal of the voltage detection device 20 are connected by the conductor 22. There is. Further, the voltage detection device 20 and a signal processing unit (not shown) are connected by an optical fiber 23. Reference numeral 24 is a support member that supports the capacitive voltage divider 12 on the switch container 1. Therefore, the voltage detection device 20 detects the low-voltage side capacitance C ₂ between the first inner cylindrical ring 16 and the outer cylindrical ring 15, and obtains the high-voltage side capacitance C ₁ (C ₁ = C ₁₁ ). Since the voltage division ratio of is constant, the voltage on the high voltage side is detected. Normally, the distribution line is provided with a switch having the same structure for each of the R phase, S phase, and T phase, and three switches are arranged in parallel to form a three-phase switch.

The operation of the switch of one phase of the three phases will be described here, but the same applies to the other phases. When the switch is closed, the movable contact 5 comes into full contact with the fixed electrode 3 and the movable contact 5 becomes a high voltage portion.
Not only the high-voltage side capacitances C ₁₁ and C ₁₂ between the surface of the arc drive coil 10 and the first inner cylindrical ring 16 and the second inner cylindrical ring 17, but also the movable contact 5 and the second inner cylinder. A high voltage side capacitance C ₁₃ is also formed between the ring 17 and the ring 17. However, since the first inner cylindrical ring 16 and the second inner cylindrical ring 17 are separated, no electrostatic capacitance is formed between the movable contact 5 and the first inner cylindrical ring 16. In addition, since the second inner cylindrical ring 17 is grounded, it functions as a shield, and only the high-voltage side capacitance C ₁₁ that is always a constant value affects the first inner cylindrical ring 16 and the switch. It is possible to prevent the influence of the electrostatic capacitance of the movable contactor 5 at the time of the opening and closing of the first inner cylindrical ring 16 from being exerted. That is, the electrostatic capacitance that fluctuates due to opening and closing of the movable contact 5 and the fixed contact 4 is
Since it is not formed between the first inner cylindrical ring 16 and the movable contact 5, the opening / closing operation of the switch is performed by the first inner cylindrical ring 16
It does not affect the measured voltage detected by the voltage detection device 20 between the outer cylindrical ring 15 and the outer cylindrical ring 15.

FIG. 2 is a side view showing a second embodiment of the present invention.
A part is shown in cross section. Capacity of the first embodiment
The type voltage divider 12 has an inner cylindrical ring as a first inner cylindrical ring 16
It was installed in two places on the second inner cylindrical ring 17, but
The inner cylindrical ring at three locations, except for the inner cylindrical ring,
The configuration is the same as that of the first embodiment. That is, the insulating material 14
Facing the arc drive coil 10 at the inner axial center
The first inner cylindrical ring 16 that is provided is provided on the movable contactor 5 side.
The second inner cylindrical ring 17 is provided, and the third inner ring 17 is provided on the fixed contactor 4 side.
An inner cylindrical ring 25 is provided, and a space is provided between the inner cylindrical rings.
There is a fixed interval. This allows the arc drive coil
10 surface and first inner cylindrical ring 16, second inner cylindrical ring
17, the high pressure side static between the third inner cylindrical ring 25 and
Capacitance C₁₁, C ₁₂, C₁₄Forming a second inner cylindrical ring 1
7 and the surface of the movable contact 5 between the high-voltage side capacitance C₁₃To
And also includes a first inner cylindrical ring 16 and an outer cylindrical ring 15
Low-voltage side capacitance C between₂ To form The second
Between the inner cylindrical ring 17 and the outer cylindrical ring 15, and the third
Conductors are provided between the inner cylindrical ring 25 and the outer cylindrical ring 15, respectively.
18 and 18 'are connected, and the outer cylindrical ring 15 is opened and closed.
It is grounded to the container 1.

Next, the operation of the second embodiment will be described. The voltage is measured by the output voltage of the capacitive voltage divider 12 as in the first embodiment. That is, the output voltage of the capacitive voltage divider 12 is determined by the capacitance voltage division of the high voltage side capacitance C ₁ and the low voltage side capacitance C ₂ . The voltage measurement error is affected by the high-voltage side capacitance that changes when the switch opens and closes. Therefore, the high-voltage side capacitance C ₁₃ between the second inner cylindrical ring 17 and the surface of the movable contact 5, which changes when the switch is opened and closed, and the surface of the arc drive coil 10 and the third inner cylindrical ring. The high-voltage side capacitance C ₁₄ between 25 and 25 is grounded to the switch case 1 via the conductors 18 and 18 ′, respectively, to separate it from the high-voltage side capacitance C _{1 and} to measure the high-voltage side during voltage measurement. Since the influence of the change in capacitance is removed, the voltage measurement error can be reduced.

[0011]

As described above, according to the present invention, two or three inner cylindrical rings are provided at intervals in the axial direction,
The inner cylindrical ring on the side of the movable contact is shielded by generating electrostatic capacitance with the movable contact so that no electrostatic capacitance is generated between the other inner cylindrical ring and the movable contact. Therefore, the opening / closing operation of the switch does not affect the measurement voltage detected by the voltage detection device between the inner cylindrical ring and the outer cylindrical ring, and the distribution line can be accurately connected regardless of whether the switch is opened or closed. This is effective in providing a switch with a built-in sensor that can measure voltage.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a first embodiment of the present invention.

FIG. 2 is a side sectional view showing a second embodiment of the present invention.

FIG. 3 is a side sectional view showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 switch container, 2 2'bushing, 3 fixed electrode, 4 fixed contact, 5 movable contact, 6, 6'leader wire, 7 extinguishing cylinder, 8 conductive ring, 9 support base, 10 arc drive coil, 11 arc-extinguishing gas, 12 volume divider, 1
3 inner cylindrical ring, 14 insulating material, 15 outer cylindrical ring, 1
6 first inner cylindrical ring, 17 second inner cylindrical ring, 1
8, 19, 21, 22 conductor, 20 voltage detection device, 2
3 optical fibers, 24 support members, 25 third inner cylindrical ring

Claims (3)

[Claims] 1. A cylinder composed of a fixed contactor provided in a switch case in which an insulating gas is sealed, a movable contactor capable of coming into contact with and separated from the fixed contactor, and a conductive material surrounding the movable contactor in an annular shape. From an arc extinguishing cylinder of the body, an inner cylindrical ring provided on the outer periphery of the movable contactor and the arc extinguishing cylinder, an insulating material closely attached to the outer periphery of the inner cylindrical ring, and an outer cylindrical ring closely attached to the outer periphery of the insulating material. In a switch with a built-in sensor, comprising: a capacitive voltage divider, and a voltage detection device that detects an output voltage of the capacitive voltage divider, the capacitive voltage divider is wound around an outer circumference of the arc extinguishing cylinder. A first inner cylindrical ring and a second inner cylindrical ring made of a cylindrical conductive material facing the arc drive coil and surrounding the annular space and provided at intervals in the axial direction of the arc extinguishing cylinder; A conductor for connecting the inner cylindrical ring and the outer cylindrical ring of 2; A switch with a built-in sensor, comprising a conductor for grounding a ring to a switch container. 2. The capacitance type voltage divider comprises a third inner cylindrical ring on the fixed contact side of the first inner cylindrical ring, and a conductor connecting the third inner cylindrical ring and the outer cylindrical ring. The switch with a built-in sensor according to claim 1, further comprising: 3. The switch with a built-in sensor according to claim 1, wherein the voltage detection device is an optical sensor that detects a voltage between the first inner cylindrical ring and ground.