JP2514607Y2 - switchboard - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a switchboard adapted to detect a temperature rise of a conductor in a housing.

B. Outline of the Invention The present invention relates to a switchboard including a component connected to the inside of a housing through a conductor, and an ultraviolet ray generating means for generating ultraviolet rays when the temperature of the conductor inside the housing rises. By providing an overheat monitoring device consisting of ultraviolet ray detection means for detecting ultraviolet rays in the case, if the temperature of the conductor rises abnormally, it is possible to immediately know this and prevent the occurrence of an accident. Is.

C. Conventional Technology First, the structure of the switchboard will be described with reference to FIG. As shown in the figure, the inside of the housing 1 made of a metal plate is partitioned by partition walls 2 and 3 to form a power bus room 4, a load bus room 5 and a breaker room 6. The partition wall 2 is provided with disconnecting portions 7a and 7b arranged in parallel in the horizontal direction at right angles to the paper surface for three phases, respectively, and the power busbars 8 of the three-phase portion introduced from the outside of the housing 1 into the power busbar chamber 4 are The three-phase load busbars 9 connected to the respective disconnecting sections 7a and arranged in the load busbar chamber 5 for connecting to the load are connected to the respective disconnecting sections 7b. Circuit breaker room 6
A drawer type breaker 11 that can be carried out to the outside of the housing 1 by opening the door 10 is provided inside so that it can be carried in and out freely. The draw-out breaker 11 is connected to a breaker (not shown) in the draw-out breaker 11 and has external conductors 14a and 14b connected to the breakers 7a and 7b by being carried into the breaker chamber 6, respectively. It has 3 phases each.

In the inside of the housing 1, electric resistance may increase due to loosening of bolts or incomplete insertion of contacts, which may cause abnormal heating of the conductor, leading to an accident. Therefore, the overheat monitoring device shown in FIG. 7 is provided inside the housing 1.

When the temperature of the power bus 8 and the load bus 9 which are conductors is normal, the light of the LED (light emitting diode) 17 is sent to the light receiving relay 19 through the optical fiber 18, and the contact 15 is maintained in the open state. Therefore, the protection relay coil 16 is not excited. When the temperature of the power bus 8 or the like rises abnormally, the light shield 21 attached to the tip of the shape memory alloy 20 moves upward to block light. Then, the contact 15 closes and the protection relay coil
16 is energized, resulting in alarms or main circuit interruptions.

D. Problems to be solved by the device However, as shown in Fig. 7, many components must be prepared, which increases the cost.

Then, this invention aims at providing the switchboard which solved such a subject.

E. Means for Solving the Problems The configuration of the present invention for achieving such an object is provided in the inside of a casing in a switchboard including constituent devices connected to the inside of the casing through a conductor. In addition, an overheat monitoring device including an ultraviolet ray generating means for generating an ultraviolet ray when the temperature of the conductor rises and an ultraviolet ray detecting means for detecting the ultraviolet ray is provided inside the housing.

F. Action When the temperature of the conductor rises and becomes overheated, the ultraviolet ray generating means operates to generate ultraviolet ray, and the ultraviolet ray detecting means detects this ultraviolet ray. Therefore, an accident in the switchboard can be prevented.

Since it is configured to detect ultraviolet rays, it can be detected without trouble even in a place where other light such as sunlight enters.

G. Embodiment Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

(A) Configuration of the Embodiment The configuration of the ultraviolet ray generating means arranged in the switchboard according to the present invention will be described with reference to FIGS. 1 to 5.

In the first embodiment, as shown in FIGS. 1 (a) and 1 (b), an elongated plate-shaped shape memory alloy 25 is attached to the outer peripheral surface of the load busbar 9. That is, when overheated, the tip end side is bent as shown by the broken line to form an L-shaped shape memory alloy 25 so that its longitudinal direction substantially coincides with the axis of the load busbar 9 and the base end portion is screwed with the load busbar 9. Combined with.

In the second embodiment, as shown in FIGS. 2 (a) and 2 (b), the length direction of the shape memory alloy 25 coincides with the circumferential direction of the load busbar 9 to form an arc shape, and the outer peripheral surface of the load busbar 9 is formed. It is in close contact with and bonded to.

A third embodiment is shown in FIGS. 3 (a) and 3 (b). this is,
A metal plate 28 is mounted on the load busbar 9 via an insulating plate 27, while the base end of a round bar-shaped shape memory alloy 25 is connected to the load busbar 9 via an auxiliary material 29 and the shape memory alloy is also attached.
A bracket 30 for holding the tip of 25 is joined to one end of a metal plate 28. On the other end side of the metal plate 28, a metal plate 31 having a constant gap G from the metal plate 28 is provided so as to be coupled to the load busbar 9.

The fourth embodiment is shown in FIG. As shown in the figure, this is the case where the igniter 32, such as sulfur, which ignites when the load busbar 9 overheats, is attached to the load busbar 9 through the fixture 33 so as to be in close contact.
The wire 32 is covered with a wire mesh 34.

A fifth embodiment is shown in FIG. This is because a rectifier (hereinafter referred to as CT) 35 surrounding the load bus 9 is provided, and a temperature switch 36 for raising the temperature is closely attached to the load bus 9, and a lamp for generating ultraviolet light is emitted to the CT 35 via the temperature switch 36. 37 is connected.

The above is the ultraviolet ray generating means, and an ultraviolet ray detector as an ultraviolet ray detecting means is used in each of these embodiments. As the ultraviolet ray detector, one having a structure for detecting only ultraviolet rays belonging to a region not included in the sun rays is used (not shown). The reason why a light receiver such as a semiconductor photosensor or a photomultiplier tube is not used is that the light receiver cannot be used in a space into which sunlight or the like enters.

(B) Operation of Embodiment Next, the operation of the overheat monitoring device including the ultraviolet ray generating means and the ultraviolet ray detecting means will be described.

In the case of the first embodiment, when the temperature of the load bus bar 9 rises and becomes overheated, the shape memory alloy 25 bends into an L-shape as shown by the broken lines in FIGS. It seems that the load bus 9 is largely projected from the outer peripheral surface. Therefore, the electric field is concentrated on the pointed portion of the shape memory alloy 25 and corona occurs. The ultraviolet ray portion in this corona is detected by the ultraviolet ray detector. In this case, the tip of the shape memory alloy 25 should be set in a state where corona is generated to a degree that causes no problem during insulation. When the overheated state of the load busbar 9 is detected, it is possible to know the overheated load busbar 9 by searching for the rising portion of the shape memory alloy 25.

In the case of the second embodiment, the shape memory alloy 25, which was arcuate along the outer peripheral surface of the load bus bar 9 at room temperature, deforms linearly when overheated. The other operation is the same as that of the first embodiment, and the description thereof will be omitted.

In the case of the third embodiment, when the load busbar 9 is at room temperature, the load busbar 9 and the metal plate 28 are connected via the shape memory alloy 25, so that they have the same potential, but when the load busbar 9 overheats. As the temperature rises, the shape memory alloy 25 bends in a dogleg shape as shown by the broken line in the figure, so that the load busbar 9 and the metal plate 28 become insulative and a voltage V of a certain value is induced between them to cause a gap. Corona discharge occurs at G. Then, the ultraviolet rays generated at this time are detected as described above.

In the case of the fourth embodiment, if the load bus bar 9 overheats, it is a ignited material.
The 32 burns due to the heat of the load bus 9, which produces UV radiation which is detected by the UV detector.

In the case of the fifth embodiment, when the load bus 9 is overheated, the temperature switch 36 is turned on, the lamp 37 is lit by the current supplied from the CT 35, and ultraviolet rays are generated. This ultraviolet ray is detected by the ultraviolet ray detector. To be detected.

H. Effects of the Invention As can be seen from the above description, the switchboard according to the present invention has the following effects.

(A) Since the conductor is provided with ultraviolet ray generating means for emitting ultraviolet rays when the conductor is abnormally overheated and ultraviolet ray detecting means for detecting the ultraviolet ray, it is possible to immediately know when the conductor is abnormally overheated, and an accident in the switchboard (B) Since the overheat monitoring device is composed only of the ultraviolet ray generating means and the ultraviolet ray detecting means, the cost is low, and the ultraviolet ray detecting means is not only overheated but also corona occurs, ground fault, etc. It is possible to detect the occurrence of arcs and monitor the switchboard from various directions.

(C) Since ultraviolet rays are used, there is no risk that electromagnetic wave noise will be erroneously detected as a signal, unlike when electromagnetic waves are used as they are. Therefore, highly reliable monitoring without malfunction can be performed without providing a filter circuit or the like.

[Brief description of drawings]

1 to 5 relate to an embodiment of a switchboard according to the present invention,
1 (a) and 1 (b) are a front view and a right side view showing a first embodiment of an ultraviolet ray generating means, and FIGS. 2 (a) and 2 (b) are a front view showing a second embodiment of the ultraviolet ray generating means. , A right side view, FIGS. 3 (a) and 3 (b) are a plan view and a front view showing a third embodiment of the ultraviolet ray generating means, and FIG. 4 is a front view showing a fourth embodiment of the ultraviolet ray generating means, a fifth example. FIG. 6 is a front view showing a fifth embodiment of the ultraviolet ray generating means, and FIGS. 6 to 7 are related to a conventional switchboard.
FIG. 7 is a sectional view of a switchboard, and FIG. 7 is a configuration diagram of an overheat monitoring device. 1 ... Case, 8 ... Power bus, 9 ... Load bus, 11 ...
Draw-out circuit breaker, 25 ... Shape memory alloy, 28,31 ... Metal plate, 30 ... Receiving, 32 ... Immersive material, 35 ... CT, 36 ... Temperature switch, 37 ... Lamp.

Claims (1)

(57) [Scope of utility model registration request] 1. A switchboard comprising a component connected to the inside of a housing via a conductor, wherein the ultraviolet generating means for generating ultraviolet light when the temperature of the conductor provided inside the housing rises, and the ultraviolet light generating means. A switchboard comprising an overheat monitoring device including an ultraviolet ray detecting means for detecting, provided inside a housing.