JPH05128931A - Cooling structure for solid insulating switch device - Google Patents

Abstract

PURPOSE:To prevent the temperature rise at monopole parts of a solid insulating switch device used for a power transmitting and transforming apparatus. CONSTITUTION:Evaporators 30 to 32 and a condenser 36 are provided above monopole parts 1 and 2 of a solid insulating switch device and a top board 10, and they are connected by a heat pipe 33. By the application of a cooling structure in which a heat pipe is applied, the radiating area of the surface of the monopole parts, which has not been applied yet due to dimensional restrictions, can be greater than twice by means of the condenser. As the result, temperature rise at the monopole parts is approximately halved, so that temperature rise prevention effect at the surface of the monopole parts can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to prevent the temperature of a solid insulated switchgear used for a switchgear used in a city center from rising due to a heat source (vacuum switch tube, etc.) inside the switch. Related to the cooling structure of.

[0002]

2. Description of the Related Art FIG. 8 is a side view for explaining a single pole portion structure adopted in a conventional solid insulation switchgear.
In the figure, reference numeral 1 shows a single pole portion A made of resin for electrically insulating and accommodating a vacuum switch tube 20 for shutting off an electric path, which will be described later, and an operating rod 23 and the like. Reference numeral 2 is a monopolar portion B having the same function as 1. Reference numeral 3 is a current transformer for measuring the electric current of the electric path, 4 is an upper disconnecting portion for cutting off the electric path to the cable 8 for power transmission and distribution, and 6 is a lower disconnecting portion having the same function. 5 is a cable joint for connecting the cable 8, 7 is a bus joint for connecting the bus bar and the solid insulated switchgear, 9 is for operating the vacuum switch tube housed inside the single pole parts 1, 2. The operation mechanism section 10 is a top plate (a perforated structure for drawing warm air from the lower part to the upper part) provided on the ceiling part of the mounting frame to which the cable joint 5 and the busbar joint 7 are fixed. The solid insulation switchgear comprises the above-mentioned single pole parts A, B1 and B2, the current transformer 3, the upper and lower disconnecting parts 4 and 6, the operating mechanism part 9, and the top plate 10 provided on the ceiling part of the mounting frame. And as shown in FIG.
The solid insulation switchgear is composed entirely of three single pole parts. The monopolar parts A, B1, B arranged in this way
The internal structure of No. 2 is shown in FIG. As shown in FIG. 9, a fixed electrode 21 and a movable electrode 22 are provided inside the vacuum switch tube 20, and an operation rod 23 which is a part of an external operation mechanism section 9 for operating the movable electrode 22 is provided. Has been.
An expandable vacuum valve bellows 24 is provided to drive the vacuum switch tube 20 while maintaining airtightness inside and outside. The insulator surface temperature θ _{W at} the 25 points arranged in this way is about 40 in the conventional structure.
[Deg] (FIG. 3).

Next, the operation will be described. Usually, the ratio of the temperature increase in the single pole part of the conventional product is about 40/50 = 0.
Most of them are 8 in this part. The reason is that the heat resistance of the surface of the single pole is high (because of adopting a natural ventilation cooling structure for the purpose of maintenance-free and compactness, the heat transfer coefficient is small and the electric heating area is also small). Reducing the temperature of this part lowers the overall temperature.

[0004]

As for the conventional temperature of the single-pole portion, since the maintenance-free structure is adopted as described above, the temperature of the single-pole portion made of resin is the outside air temperature of 40 ° C. In this case, the temperature of the single pole part of the conventional product was almost the limit as shown in FIG. Therefore, when energizing more,
There has been a problem that the temperature rise of the single pole portion exceeds the allowable temperature of the resin.

The present invention has been made to solve the above problems, and an object of the present invention is to reduce the temperature of a single pole portion while satisfying maintenance-free in a limited space.

[0006]

According to the solid insulation switchgear cooling structure of the present invention, a heat is generated in the solid insulation switchgear through a heat pipe by press-contacting an outer periphery of a single pole with an evaporator. The solid insulation switchgear is cooled by radiating the generated heat to the atmosphere using a condenser.

[0007]

The heat transfer coefficient (several 1000 [Kcal / m ² · h · ° C]) of the evaporator and the condenser of the heat pipe is very large. Therefore, the temperature drop (2
~ 3 [deg]), it can be almost ignored. Therefore, the heat pipe can be used to increase the heat transfer area at this position and dissipate the heat by the condenser installed in the space above the top plate.

[0008]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a cooling structure of a solid insulation switchgear according to an embodiment of the present invention (however, the solid insulation switchgear body is omitted to simplify the drawing). Reference numeral 32 is an evaporator (upper), (middle), (lower) pressed against the solid insulation switchgear for the purpose of heat transfer, 30 is the single pole part A1 shown in FIG. 9, and 31 is the single pole part B2.
1 surrounds the same diameter part as 1 and 32 surrounds the small diameter part of the single pole part B2. A heat pipe 33 connects the evaporator and the condenser 36. 34 and 35 (see FIG. 2) are screws and tightening bands for tightening the evaporator. The condenser 36 is mounted on the top plate 10 of the solid insulation switchgear, and the top plate 10 and the condenser 36.
A space is provided between them. The current transformer 3 is not directly related to the cooling structure, but is for measuring the current flowing in the solid insulated switchgear. Reference numeral 37 is natural ventilation air that recirculates inside the condenser. 2 shows a modified example of the evaporator.

FIG. 3 is a graph showing the thickness t and temperature drop characteristics of the evaporator (upper), (middle), and (lower), and FIG. 4 is shown in FIG.
FIG. 5 is a diagram for explaining the characteristics of FIG.
The state where 0, 31, and 32 are specifically attached is shown. Figure 6
[Fig. 4] is a temperature characteristic diagram comparing the temperature of a single electrode part of a conventional product with the temperature of a single electrode part when a heat pipe is attached. FIG. 7 shows a distance (horizontal axis t [m
m]) is a diagram drawn to correspond.

Next, the operation will be described. Assuming that the heat generated inside the solid insulation switchgear is uniformly dissipated in the radial direction, the temperature drop Δθ in the radial direction is shown by the following equation based on FIG.

Δθ = Q · R (1) where Q [w]: heat dissipation, R [° C / w]: thermal resistance

R = ln (D ₁ / D ₂ ) · 0.86 / (2 · π · K) (2) D ₁ and D ₂ [m ² ] (FIG. 4) K [Kcal / m · h · ° C.] ]: Thermal conductivity of single pole

From the equations (1) and (2), when the temperature drop Δθ in the radial direction of the single pole portion is obtained, Δθ = 5 to 8 [deg]. As for the temperature drop Δθ inside the evaporators 30 to 32 in FIG. 4, since the heat pipe 33 is not arranged all around, it is appropriate to consider the temperature drop Δθ1 / 4 in the circumferential direction. Considering this, the temperature drop Δθ1 / 4 in the circumferential direction when the thickness t [mm] of the evaporator and the material (Al: aluminum, Cu: copper) are changed is shown in FIG. From this figure, in order to reduce the temperature drop between the single pole part and the atmosphere, it is preferable to use a copper material (Cu> Al) having a high thermal conductivity and a large thickness t as the material of the evaporator.

The temperature gradient inside the heat pipe can be ignored. In the condenser, the condenser 36 was attached to the top of the top plate 10 by a heat pipe. As a result, a large heat transfer area for radiating heat to the atmosphere can be obtained (conventionally, since a large heat transfer area could not be obtained on the surface of the single pole part due to dimensional restrictions, the temperature of the single pole part of the conventional product is as shown in FIG. Since it was possible to reduce the thermal resistance, the thermal resistance (R = 1 / (α · A), R [° C · h] up to the temperature shown in FIG.
/ Kcal]: Thermal resistance, α [Kcal / m ² · h ・
[° C.]: heat transfer coefficient, A [m ² ]: heat transfer area) became small, and the temperature was lowered.

[0015]

As described above, according to the present invention, the evaporator is brought into pressure contact with the surface of the single pole portion, the condenser is arranged above the top plate of the solid insulating switchgear, and the two are connected by the heat pipe. Therefore, by radiating the amount of heat generated inside the solid insulated switchgear to the atmosphere, a cooling structure of the solid insulated switchgear for cooling the surface temperature of the single pole part within the restricted space dimension became possible. ..

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention with a part thereof omitted.

FIG. 2 is a perspective view showing another shape of the evaporator.

FIG. 3 is a characteristic curve showing a circumferential temperature drop inside an evaporator.

FIG. 4 is a cross-sectional view of a single pole portion shown for studying a circumferential temperature drop.

FIG. 5 is a cross-sectional view showing an example in which an evaporator is attached to the single pole part.

FIG. 6 is a characteristic curve comparing the single pole temperature (cooling performance) of the conventional product and that of the present invention.

FIG. 7 is a diagram corresponding to a graph drawn to show the horizontal dimension (distance) on the characteristic curve.

FIG. 8 is a side view of a conventional solid insulated switchgear device.

FIG. 9 is a cross-sectional view of a single pole portion forming a part of a conventional solid insulated switchgear.

[Explanation of symbols]

 1 Single pole part A 2 Single pole part B 3 Current transformer 4 Top disconnection diagram 5 Cable joint 6 Lower disconnection part 7 Busbar joint 8 Cable 9 Operating mechanism part 10 Top plate 20 Vacuum switch pipe 30 Evaporator (upper) 31 Evaporator (Middle) 32 Evaporator (Bottom) 33 Heat pipe 34 Tightening screw 35 Tightening band 36 Condenser

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[Procedure amendment]

[Submission date] January 11, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Patent application title: Cooling structure for solid insulated switchgear

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to prevent the temperature of a solid insulated switchgear used for a switchgear used in a city center from rising due to a heat source (vacuum switch tube, etc.) inside the switch. Related to the cooling structure of.

[0002]

2. Description of the Related Art FIG. 8 is a side view for explaining a single pole portion structure adopted in a conventional solid insulation switchgear.
In the figure, reference numeral 1 shows a single pole portion A made of resin for electrically insulating and accommodating a vacuum switch tube 20 for shutting off an electric path, which will be described later, and an operating rod 23 and the like. Reference numeral 2 is a monopolar portion B having the same function as 1. Reference numeral 3 is a current transformer for measuring the electric current of the electric path, 4 is an upper disconnecting portion for cutting off the electric path to the cable 8 for power transmission and distribution, and 6 is a lower disconnecting portion having the same function. 5 is a cable joint for connecting the cable 8, 7 is a bus joint for connecting the bus bar and the solid insulated switchgear, 9 is for operating the vacuum switch tube housed inside the single pole parts 1, 2. The operation mechanism section 10 is a top plate (a perforated structure for drawing warm air from the lower part to the upper part) provided on the ceiling part of the mounting frame to which the cable joint 5 and the busbar joint 7 are fixed. The solid insulation switchgear comprises the above-mentioned single pole parts 1 and 2 , the current transformer 3, the upper and lower disconnecting parts 4,
6, the operation mechanism section 9, and the top plate 10 provided on the ceiling portion of the mounting frame, and as shown in FIG. 8, the solid insulation switchgear is entirely constituted by three single pole portions. The internal structure of the monopolar parts 1 and 2 arranged in this way is shown in FIG. As shown in FIG. 9, a fixed electrode 21 and a movable electrode 22 are provided inside the vacuum switch tube 20, and
An operation rod 23 that is a part of an external operation mechanism section 9 that operates the movable electrode 22 is provided. Vacuum switch tube 2
In order to drive while maintaining the airtightness inside and outside of 0,
An expandable vacuum valve bellows 24 is provided.
The insulator surface temperature θ _{W at} the 25 points arranged in this way is about 40 [deg] in the conventional structure (FIG. 3).
become.

Next, the operation will be described. Usually, the ratio of the temperature increase in the single pole part of the conventional product is about 40/50 = 0.
Most of them are 8 in this part. The reason is that (because it uses natural ventilation cooling structure for the purpose of maintenance-free and compact, low thermal conductivity, moreover heat transfer area is small) the thermal resistance of the single-pole unit surface high is because .. Reducing the temperature of this part lowers the overall temperature.

[0004]

As for the conventional temperature of the single-pole portion, since the maintenance-free structure is adopted as described above, the temperature of the single-pole portion made of resin is the outside air temperature of 40 ° C. In this case, the temperature of the single pole part of the conventional product was almost the limit as shown in FIG. Therefore, when energizing more,
There has been a problem that the temperature rise of the single pole portion exceeds the allowable temperature of the resin.

The present invention has been made to solve the above problems, and an object of the present invention is to reduce the temperature of a single pole portion while satisfying maintenance-free in a limited space.

[0006]

According to the solid insulation switchgear cooling structure of the present invention, a heat is generated in the solid insulation switchgear through a heat pipe by press-contacting an outer periphery of a single pole with an evaporator. The solid insulation switchgear is cooled by radiating the generated heat to the atmosphere using a condenser.

[0007]

The heat transfer coefficient (several 1000 [Kcal / m ² · h · ° C]) of the evaporator and the condenser of the heat pipe is very large. Therefore, the temperature drop (2
~ 3 [deg]), it can be almost ignored. Therefore, the heat pipe can be used to increase the heat transfer area at this position and dissipate the heat by the condenser installed in the space above the top plate.

[0008]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a cooling structure of a solid insulation switchgear according to an embodiment of the present invention (however, the solid insulation switchgear body is omitted to simplify the drawing). 32 is an evaporator (upper), (middle), and (lower) pressed against the solid insulation switchgear for the purpose of heat transfer, 30 is the single-pole part 1 shown in FIG. 9, and 31 is the single-pole part 2 . Of these, the same diameter part as 1 and the small diameter part of the single pole part 2 are surrounded by 32. A heat pipe 33 connects the evaporator and the condenser 36. 34 and 35 (see FIG. 2) fix the evaporator
It is a tightening screw and a tightening band. The condenser 36 is mounted on the top plate 10 of the solid insulation switchgear, and the top plate 10 and the condenser 3
A space is provided between the six. The current transformer 3 is not directly related to the cooling structure, but is for measuring the current flowing in the solid insulated switchgear. Reference numeral 37 is natural ventilation air that recirculates inside the condenser. 2 shows a modified example of the evaporator.

FIG. 3 is a graph showing the thickness t and temperature drop characteristics of the evaporator (upper), (middle), and (lower), and FIG. 4 is shown in FIG.
FIG. 5 is a diagram for explaining the characteristics of FIG.
The state where 0, 31, and 32 are specifically attached is shown. Figure 6
[Fig. 4] is a temperature characteristic diagram comparing the temperature of a single electrode part of a conventional product with the temperature of a single electrode part when a heat pipe is attached. Figure 7 is the distance along the monopolar units 1 and 2 of the temperature characteristic diagram of FIG. 6 (horizontal axis t [m
m]) is a diagram drawn to correspond.

Next, the operation will be described. Assuming that the heat generated inside the solid insulation switchgear is uniformly dissipated in the radial direction, the temperature drop Δθ in the radial direction is shown by the following equation based on FIG.

Δθ = Q · R (1) where Q [w]: heat dissipation, R [° C / w]: thermal resistance

R = ln (D ₁ / D ₂ ) · 0.86 / (2 · π · K) (2) D ₁ and D ₂ [m ² ] (FIG. 4) K [Kcal / m · h · ° C.] ]: Thermal conductivity of single pole

From the equations (1) and (2), when the temperature drop Δθ in the radial direction of the single pole portion is obtained, Δθ = 5 to 8 [deg]. As for the temperature drop Δθ inside the evaporators 30 to 32 in FIG. 4, since the heat pipe 33 is not arranged all around, it is appropriate to consider the temperature drop Δθ1 / 4 in the circumferential direction. Considering this, the temperature drop Δθ1 / 4 in the circumferential direction when the thickness t [mm] of the evaporator and the material (Al: aluminum, Cu: copper) are changed is shown in FIG. From this figure, in order to reduce the temperature drop between the single pole part and the atmosphere, it is preferable to use a copper material (Cu> Al) having a high thermal conductivity and a large thickness t as the material of the evaporator.

The temperature gradient inside the heat pipe can be ignored. In the condensing unit, fitted with a condenser 36 in the top plate 10 top by a heat pipe. As a result, a large heat transfer area for radiating heat to the atmosphere can be obtained (conventional product has a large heat transfer area due to dimensional restrictions. Was the value shown in),
The thermal resistance could be reduced . As a result, thermal resistance (R = 1 / (α · A), R [° C · h] up to the temperature shown in FIG.
/ Kcal]: Thermal resistance, α [Kcal / m ² · h ・
[° C.]: heat transfer coefficient, A [m ² ]: heat transfer area) became small, and the temperature was lowered.

[0015]

As described above, according to the present invention, the evaporator is brought into pressure contact with the surface of the single pole portion, the condenser is arranged above the top plate of the solid insulating switchgear, and the two are connected by the heat pipe. Therefore, by radiating the amount of heat generated inside the solid insulated switchgear to the atmosphere, a cooling structure of the solid insulated switchgear for cooling the surface temperature of the single pole part within the restricted space dimension became possible. ..

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention with a part thereof omitted.

FIG. 2 is a perspective view showing another shape of the evaporator.

FIG. 3 is a characteristic curve showing a circumferential temperature drop inside an evaporator.

FIG. 4 is a cross-sectional view of a single pole portion shown for studying a circumferential temperature drop.

FIG. 5 is a cross-sectional view showing an example in which an evaporator is attached to the single pole part.

FIG. 6 is a characteristic curve comparing the single pole temperature (cooling performance) of the conventional product and that of the present invention.

FIG. 7 is a diagram corresponding to a graph drawn to show the horizontal dimension (distance) on the characteristic curve.

FIG. 8 is a side view of a conventional solid insulated switchgear device.

FIG. 9 is a cross-sectional view of a single pole portion forming a part of a conventional solid insulated switchgear.

[Explanation of Codes] 1 Single pole part A 2 Single pole part B 3 Current transformer 4 Upper disconnection part 5 Cable joint 6 Lower disconnection part 7 Busbar joint 8 Cable 9 Operating mechanism part 10 Top plate 20 Vacuum switch tube 30 Evaporator ( 31) Evaporator (middle) 32 Evaporator (bottom) 33 Heat pipe 34 Tightening screw 35 Tightening band 36 Condenser

Claims (1)

[Claims] 1. A cooling structure for a solid insulation switchgear, characterized in that a resin surface for electrically insulating a vacuum switch tube is surrounded by an evaporator, and the evaporator is connected to a condenser by a heat pipe.