JP2606179Y2 - Gas density monitoring device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a gas density monitoring device for an electric device filled with insulating gas.

[0002]

2. Description of the Related Art SF ₆ gas has been widely used as a sealed SF ₆ gas for transformers, circuit breakers, etc. because of its excellent insulating performance and cooling performance. However, since the insulation and cooling performance is determined by the density of the sealed SF ₆ gas, it is necessary to constantly monitor a decrease in gas density due to gas leakage in such a gas insulation device. Therefore, conventionally, a gas density monitoring device using a gas density relay or the like has been used to constantly monitor a decrease in gas density. This conventional gas density monitoring device monitors the gas density by issuing an alarm when the gas density falls below a predetermined limit value.

However, only an alarm is issued when the gas density falls below the limit value, and the readings of the pressure gauge and the thermometer attached to the equipment are read to determine the gas density and the reading instruction is given. The difference between the value and the initial filling pressure (rated pressure) was determined from the temperature and pressure characteristic nameplate. In this case, the gas density monitoring device requires a thermometer and a pressure gauge for measuring the temperature and pressure of the gas in the container of the gas insulating device, and the operator visually observes these measured values, and refers to these values as temperature- Since the plotting on the pressure characteristic nameplate involves the work of plotting the measured values of the observer, a maintenance person is required.

[0004] Further, there is a disadvantage that a measurement error occurs due to a plot error and reliability is reduced.

Therefore, the present applicant has previously proposed a new type of gas density monitoring device (Japanese Utility Model Application Laid-Open No. 62-59713). This was made in order to solve the above-described problems of the conventional gas density monitoring device, and eliminates the need for a temperature-pressure characteristic nameplate, so that a monitor can determine at a glance whether or not the charged gas pressure is appropriate. In addition, the configuration is simple and automatic monitoring can be performed. The first pointer and the second pointer are separately rotated coaxially, and the first pointer responds to the pressure in the temperature-sensitive cylinder, and A first pressure / rotation conversion unit for providing a rotating force when the gas temperature in the gas insulated equipment container increases or decreases; and the second pointer responds to the gas pressure in the gas insulated equipment container by the second pointer.
A second pressure / rotational transformation unit giving the same direction of rotational force to guide, by sealing Pneumatic fluid to said temperature sensing in the cylinder, arranged sensitive bulb temperature measuring portion of the gas-insulated container It was done.

[0006] The above gas density monitoring device (Japanese Utility Model Application Laid-Open No. 62-5)
9713) will be described with reference to FIG. 4, FIG. 5, and FIG. In FIG. 4, reference numeral 21 denotes a gas insulating device whose gas density is monitored.
Cooler 24 and gas insulated equipment container 25 via
Is connected to the inside of The gas supply passage 26 connects the cooler 24 and the SF ₆ gas supply tank 27,
When the amount of gas inside the gas insulating device 21 becomes insufficient, a valve or the like (not shown) provided in the gas supply passage 26 is operated to supply the gas from the gas supply tank 27 to the inside of the gas insulating container 25 via the cooler 24. . The inside of the gas-insulated equipment container 25 includes an iron core 28 and a coil 29 constituting a transformer and the temperature-sensitive cylinder 3.
0 in the transformer portion B by the operation of a fan (not shown) provided in the gas connection passages 22 and 23, or
The SF ₆ gas is circulated from the cooler 24 by natural convection. The gas passage 31 connects the inside of the gas-insulated equipment container 25 to the gauge portion 32, and the gauge portion 32 is connected to the temperature-sensitive cylinder 30 via the gas passage 33. Arrows indicate the flow of SF ₆ gas.

Next, the mechanism of the temperature sensing cylinder 30 and the gauge section 32 will be described with reference to FIGS. The temperature-sensitive cylinder 30 is formed of a cylindrical gas-filled container extending vertically above and below the gas-insulated equipment container 25. Inside the temperature-sensitive cylinder 30 is the same SF ₆ as the gas sealed inside the gas-insulated equipment container 25.
The gas is sealed, and SF ₆ gas having a pressure P ₁ substantially equal to the rated pressure (at 20 ° C.) sealed inside the gas-insulated equipment container 25 is sealed. And this thermosensitive cylinder 3
At 0, a pressure converter 34 (made of a Bourdon tube or bellows) is provided, and changes the pressure change inside the temperature-sensitive cylinder 30 by a mechanical displacement proportional to the pressure change. In addition, the displacement of the mechanical position gives a rotating power to the first pointer (plate) 36 by the conversion unit 35, and the pressure conversion unit 34 and the conversion unit 35 use the first pressure / rotation conversion unit. P
₁ / R constitute, for example, the first pointer (plate) 36 when the internal pressure P ₁ of the temperature sensing tube 30 is lowered is rotated in the counterclockwise direction in FIG. 6, when the pressure P ₁ rose clock Rotate in the direction. Further, as shown in FIG. 4, the pressure converter 37 converts the pressure change inside the gas insulated equipment container 25 in which the pressure P ₂ inside the gas insulated equipment container 25 is guided by the gas passage 31 into a mechanical change proportional to the pressure change. Change to displacement of position. In addition, the displacement of the mechanical position gives a rotational power to the second pointer 39 by the conversion unit 38. The pressure conversion part 37 and the conversion part 38 constitute a _second pressure / rotation conversion part P ₂ / R. For example, when the pressure P ₂ inside the gas insulated equipment container 25 decreases, the second pointer 39 is used. It is rotated in the counterclockwise direction in FIG. 6, when the pressure P ₂ in the up rotates clockwise. In addition, 40 is a scale plate, and 41 is a gauge main body.
The contact 42 is provided on the first pointer (plate) 36, and the contact 43 is provided on the second pointer 39. These contacts 42 and 43 are provided at opposing positions, and come into contact when the gas pressure is in a dangerous range to operate the alarm C.

[0008]

However, since the gas is sealed in the temperature-sensitive cylinder and the temperature-sensitive cylinder is arranged in the temperature measuring section in the container of the gas insulated equipment, the volume of the pressure conversion section and the volume of the conduit are increased. In consideration of the above, since the volume of the temperature-sensitive cylinder increases to increase the accuracy, the temperature-sensitive cylinder becomes a protruding electrode of the ground potential in the temperature measuring section of the gas-insulated equipment, and can sandwich the insulating space in the gas-insulated equipment container. In other words, the size of the gas-insulated equipment container increases accordingly.

The present invention has been made in view of the above points, and provides a gas-insulated device in which the size of a temperature-sensitive cylinder of a gas density monitoring device is reduced to improve insulation reliability and reduce the size. The purpose is to:

[0010] The gas density monitoring device of the present invention comprises a first pointer and a second pointer, each rotating separately on the same axis, and the first pointer and the second pointer.
A first pressure / rotation converter for responding to a change in the volume of liquid in the temperature-sensitive cylinder and providing a turning force when the temperature of the gas in the gas-insulated equipment container increases and decreases; And a second pressure / rotation conversion unit that applies a rotational force in the same direction as the first pointer in response to the gas pressure of the first needle. The gas density monitoring device provided in the temperature measuring section in the gas insulation equipment container is characterized in that the degree of gas leakage can be visually checked.

[0011]

Since the first needle (plate) is driven by converting the expansion and contraction of the volume due to the temperature of the liquid by enclosing the liquid in the temperature sensitive cylinder and configured as described above, the volume of the temperature sensitive cylinder is It is smaller than gas and does not interpose an insulating space in a gas insulating device, so that the reliability of insulation is increased.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, the mechanism of the temperature sensing cylinder and the gauge unit will be described with reference to FIGS. 1 and 2. FIG. Temperature sensing tube 1 is made of a cylindrical liquid sealing container 2 which was over the top and bottom of the gas-insulated equipment container, in the interior of the temperature sensing tube 1, the liquid
At this time, the pressure P being substantially the same as the rated pressure (at 20 ° C.) sealed inside the gas-insulated equipment container.
The pressure is adjusted with a gas so as to be 1 . The temperature-sensitive cylinder 1 is provided with a pressure converter 3 (made of a Bourdon tube or a bellows), and the pressure changes in proportion to the volume change of the liquid sealed in the temperature-sensitive cylinder 1. And
Change to mechanical displacement. In addition, the mechanical position displacement applies a rotating force to the first pointer (plate) 6 by the conversion unit 5, and the first pressure / rotation conversion is performed by the pressure conversion unit 3 and the conversion unit 5. The first pointer (plate) 6 is configured as shown in FIG. 2 when the pressure inside the temperature-sensitive cylinder 1 is reduced.
, And when the pressure P1 rises, it is rotated clockwise. As shown in FIG. 2, the pressure conversion unit 7 converts the pressure change inside the gas-insulated equipment container, which is caused by the pressure P2 inside the gas-insulated equipment container, into the mechanical position of the mechanical position proportional to the pressure change. Change to displacement. Also,
The displacement of the mechanical position is converted by the conversion unit 9 into the second pointer 10.
Is to be turned. This pressure converter 7
And the conversion unit 9 constitute a second pressure / rotation conversion unit P2 / R. For example, when the pressure P2 inside the gas-insulated equipment container decreases, the second pointer 10 rotates counterclockwise in FIG. Let
When the pressure P2 rises, it is turned clockwise. Reference numeral 11 denotes a scale plate, 12 denotes a display plate attached to the first pointer (plate) 6, and 13 denotes a gauge body. The first contact 14 is provided on the first pointer (plate) 6, and the second contact 15 is provided on the second pointer 10. These contacts 14 and 15 are provided at opposing positions, and when the gas pressure falls within the dangerous range, the contacts 14 and 15 operate the alarm A.

FIG. 3 is a temperature-pressure curve diagram showing the temperature-pressure relationship of the second indicator 10, wherein the pressure parameter is the gas pressure of the gas-insulated equipment and is determined by the pressure specification of the gas-insulated equipment. The temperature-pressure characteristics are approximately the characteristics of an ideal gas (Boiler-Schar law). Gas pressure at 20 ° C is, the straight line P ₁ is 0.5kgf / cm ² · g, linear P ₂ is 0.7kgf / cm ² · g, linear P ₃ is 1.0kg
f / cm ² · g and the straight line P ₃ show the case of 1.2 kgf / cm ² · g.

As an example, if the gas pressure of the gas insulating device is 1.
In the case of 0 kgf / cm ² · g (at 20 ° C.), the relationship between the temperature-sensitive cylinder temperature and the indicated value of the second indicator is represented by a straight line P ₃ , and the second indicator is converted so as to have such a relationship.

The gas density monitoring device of the present invention is shown in FIG.
Is mounted in the same configuration as the conventional example.

[0016]

[Table 1]

[0017]

[Effect of the Invention] As described above, since the liquid is sealed in the temperature-sensitive cylinder and the pointer is driven by converting the volume expansion / contraction caused by the temperature of the liquid, (1) miniaturization of the gas insulation device ( 2) The insulation reliability of the gas insulation device is improved.

(3) The downsizing of the temperature-sensitive cylinder allows the downsizing of the instrument.

(4) Cost reduction by downsizing can be achieved.

The following effects can be obtained.

[Brief description of the drawings]

FIG. 1 is a main part configuration diagram showing an embodiment of a gas density monitoring device of the present invention.

FIG. 2 is a plan view of a display unit of the embodiment of the gas density monitoring device of the present invention.

FIG. 3 is a temperature-pressure curve diagram of the embodiment of the gas density monitoring device of the present invention.

FIG. 4 is a main part configuration diagram showing an attached state of the gas density monitoring device of the gas insulating device.

FIG. 5 is a main part configuration diagram showing a conventional gas density monitoring device.

FIG. 6 is a plan view of a display unit of the embodiment of the conventional gas density monitoring device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Temperature sensing cylinder 2 ... Liquid enclosure 3 ... Pressure conversion part 4 ... Liquid passage 5 ... Conversion part 6 ... First pointer (plate) 8 ... Gas passage 9 ... Conversion part 10 ... Second pointer 11 ... Scale plate 12 ... display panel 13 ... gauge body 14 ... first contact 15 ... second contact a ... alarm P ₁ / R ... first pressure / rotational transformation unit P ₂ / R ... second pressure / rotational transformation unit

Claims (1)

(57) [Scope of request for utility model registration] 1. A first pointer and a second pointer, each of which rotates independently on the same axis, and the first pointer responds to a change in the liquid volume in the temperature-sensitive cylinder and increases or decreases the gas temperature in the gas-insulated equipment container. A first pressure / rotational converter for sometimes providing a rotational power;
A second pressure / rotation conversion unit that applies a rotational force in the same direction as the first pointer in response to the gas pressure in the gas-insulated equipment container to the pointer; A gas density monitoring device, wherein the temperature-sensitive cylinder is disposed in a temperature measuring section inside the gas insulating equipment container.