JPH01257272A - Voltage application display device for three-phase low voltage electric cable - Google Patents

Abstract

PURPOSE:To simplify attaching and to improve reliability, by forming a unitary body with a liquid crystal display element and a current collecting plate to constitute the main body of a display device. CONSTITUTION:A display part 15 including a liquid crystal display element 18 and a current collecting plate 13 are formed a unitary body to constitute a main body 19 of a display device. The current collecting plate 13 comprises a material having elasticity and conductivity and also serves as the attaching tool of the display part 15. The element 18 is housed in a display case 15a having a display window 15b in said display part 15. An electrode terminal 11 of the element 18 is connected to the current collecting plate 13 through a screw terminal 11a. An electrode terminal 12 of the element 18 is connected to a socket terminal 12a. Since only one current collecting plate 13 is attached to the display main body 19, the current collecting plate 13 is not erroneously attached. Since the current collecting plate 13 also serves as the attaching tool of the display part 15 and forms a unitary body together with the main body 19, attachment is simple, reliability is improved and the cost can be reduced.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention detects and displays the state in which AC voltage is applied to a three-phase low-voltage power distribution line, that is, the energized state, so that it can be used to detect power outage lines during various types of work. The present invention relates to a power warning indicator whose purpose is to prevent accidents that may occur due to mixing up power warning wires.

``Prior art'' A utility model is proposed for a low-voltage insulated wire energization indicator that detects and displays whether or not AC voltage is being applied between the lines of a single-phase or multi-phase low-voltage distribution line consisting of multiple insulated wires. It is described in detail in Registration Application No. 61-037932.

゛This energizing indicator for low-voltage insulated wires is equipped with one display section and two auxiliary electrodes called current collector plates, and is constructed by connecting the display section between the two current collector plates. The electric plates are installed on different electric lines and operated. Therefore, for example, as shown in FIG.
In order to detect the voltage status between 1 and 2, between 2 and 3, and between 3 and 1, three low voltage insulated wire power indicators 10.20
．． In this case, it was necessary to install three display units 15.25.35 and six current collector plates 13.14.23,
24, 33, and 34, and it was necessary to connect them with six lead wires 16, 17, 26, 27, 36, 379. Of the symbols used in the diagram, 13 to 18
．． 23 to 28. 33 to 38 are charging indicators 10.
Indicates that it is a component of 20.30.

[Problems to be Solved by the Invention] As mentioned above, when the conventional charge display for low voltage insulated wires is attached to a three-phase low voltage insulated wire, three display sections, six current collector plates, and six A lead wire was required. In addition, even if one current collector plate is configured so that the display unit and the current collector plate are integrated so that the display unit also serves as a mounting tool, in addition to the three display units, there are three current collector plates and three current collector plates. I needed a book lead. Therefore, the installation of the display section, current collector plate, and lead wires was complicated, and it also looked cluttered. In addition, since two current collector plates are attached to one electric wire, the current collector plates may come into contact with each other.
There is a possibility of accidentally attaching two current collector plates connected to the same display on the same wire, and if they are attached incorrectly, there is no indication that power is being applied, which may lead to misunderstandings. The present invention was made in view of these problems, and provides a power charging indicator for three-phase low-voltage insulated wires that is easy to install, reduces the number of parts, and has a clean appearance. It is intended to.

[Means for Solving the Problems] The basic configuration of the present invention for achieving the above object is shown in FIG. Figure 1 shows the case where the present invention is applied to three-phase low-voltage insulated wires 1.2.3, and 1a, 2a, and 3a are each insulated wire 1.
, 2.3 core wires, 1b, 2b, and 3b indicate the insulation coating of each insulated wire. Further, numeral 15 in the figure is a display section that includes a liquid crystal display element 182 and has two terminals 11 and 12.
One terminal 11 of 8 and the current collector plate 13 are connected with a lead wire 16 to form a display main body 19. Similarly, 25 in the figure is a display section that includes a liquid crystal display element 28 and has two terminals 21 and 22, and one terminal 21 of the display section 28 and the current collector plate 23 are connected with a lead wire 26 to form a display. There are two main bodies. moreover,
In the figure, 35 includes a liquid crystal display element 38 and two terminals 31.3.
2, one terminal 31 of the display section 38
Connect the current collector plate 33 with the lead wire 36 to connect the display main body 39.
shall be.

Each display section 18 of these three display main bodies 19, 29, 39
．． The other three terminals of 28.38 12.22.32
are connected to each other by two lead wires 47 and 48 to constitute a low-voltage three-phase insulated wire power charging indicator 50. And these 3
Display unit 19, 29, 39 three-phase low voltage insulated wire 1
．． 2.3, install one for each phase so that they do not come into electrical contact with each other.

Since the current charging indicator for three-phase low-voltage insulated wires of the present invention configured as described above has only one current collector plate attached to each indicator body, there is no possibility of incorrect installation of the current collector plate, especially as described below. As shown in the embodiment of FIG. 3, the current collector plate is integrated with the display main body so that it also serves as a tool for mounting the display section, and
When the lead wire is a lead wire with three terminals, as shown in the example shown in FIG. All you have to do is connect them with a lead wire with 3 terminals, which makes installation easy and gives a very clean appearance.

The display section can generally be composed of only a liquid crystal display element, but as described in Patent Application No. 61-272873, it may also be composed of an electronic circuit added to the liquid crystal display element.9 "Function" Next 2(a) and FIG. 2(b). FIG. 2(a) is a diagram showing an equivalent circuit of FIG. The same reference numerals as in Fig. 1 are used for the inside numbers.Here, the description will be made assuming that the display section is composed only of liquid crystal display elements.

In Fig. 2 (a> and Fig. 2 (b)), Co1, C
o2. Co3 is a current collector plate 13.2 provided on the core wires 1a, 2a, 3a of each phase and the insulating coatings 1b, 2b, 313 of each phase.
The capacitances between C11, C10, and C53 are the capacitances of the liquid crystal display elements 18, 28, and 38.

FIG. 2(b) is an approximate equivalent circuit when focusing on between the core wire 1a and the core wire 2a. In FIG. 9, ■, 1 is the voltage applied to the liquid crystal display element 18, The voltage applied to , ■, is the voltage applied between the current collector plate 13 and the current collector plate 23, and there is a relationship of ■, -v, 1+V, 29. Also, ■ is the line voltage between the core wire 1a and the core wire 2a. be.

Now, if C11=C12, the liquid crystal display element 18.2
The combined capacitance C1 of 8 is C4-C11/2. Further, if the threshold value of the liquid crystal display element is Vt, then in order to display both of the liquid crystal display elements 18 and 28 connected in series, a voltage V of the magnitude of V[-2Vt must be applied to the current collector plate 1.
3 and the current collector plate 239. Here, Co
Considering C〉〉Co1 as 1−Co2, the line voltage V required for display on two liquid crystal display elements connected in series is:
V:(2c/c)vt...-(1)[101.

The result of formula <1> is the same as the voltage of the conventional low-voltage power line charging indicator. In other words, it can be said that the three-phase low-voltage insulated electric wire power charging indicator of the present invention has succeeded in reducing the number of current collector plates by half and achieving a simple configuration without reducing sensitivity.

"Embodiment" The embodiment shown in FIG. 3 is a sectional view of a case where a display unit 19 is constructed by integrating a display section 15 including a liquid crystal display element 18 and a current collector plate 13. The current collector plate 13 is made of an elastic and conductive material, and also serves as a mounting tool for the display section 15. In this embodiment, the display section 15 is constructed by housing a liquid crystal display element 18 in a display case 15a having a display window 15b.

The electrode terminal 11 of the liquid crystal display element 18 is attached to the current collector plate 13 which also serves as a tool through the strip terminal 11a, and the liquid crystal display element 18
The electrode terminal 12 of is connected to the socket terminal 12a.

Figure 4 shows three display main bodies with the structure shown in Figure 3;
2 and 39 are attached to the three-phase low-voltage insulated wire 1.2.3 of three trees, and connected with the lead wire 49 with three plug terminals to form the power charging indicator 50 for the three-phase low-voltage insulated wire of the present invention. In the configuration of this embodiment, each of the current collector plates 13, 23.
When the length of 33 was 20 mm and the capacitance of each liquid crystal display element (not shown) was 3009 F, it was confirmed that a clear display operation could be performed by applying a three-phase voltage of 200 V.

Further, the embodiment shown in FIG. 5 has three display windows 15a and 25.
Three display main bodies (not shown) are housed in one case 41 having 35a and 35a, and the other three terminals (not shown) of the display part (not shown) are connected inside the case 41. Connect and
This is an example in which a charge display 50 for three-phase low-voltage insulated wires is integrated.

"Effects of the Invention" The charge indicator for three-phase low-voltage insulated wires of the present invention reduces the number of parts such as the number of lead wires and the number of current collector plates.
Not only does it look cleaner, but it also makes it possible to improve reliability and reduce costs. In addition, installation is easier, and there is no contact between current collector plates,
It is also possible to prevent display defects caused by incorrect installation.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the basic configuration of the charge indicator for three-phase low voltage insulated wires of the present invention, Fig. 2 <a) is a diagram showing the equivalent circuit of Fig. 1, and Fig. 2 (b> is the main Approximate equivalent circuit diagrams for explaining the invention in detail, FIGS. 3, 4, and 5 are diagrams showing embodiments, and FIG. 6 is a configuration of a conventional power charging indicator for low-voltage insulated wires. In the figure, 18.28.38 is a liquid crystal display element 15.25.35 is a display part 1.2.3 is a three-phase low voltage insulated wire 11.12.21.22.31.32 is a display part Terminals 13, 23, and 33 are current collector plates 19, 29, and 3 are indicator bodies 50 are power charging indicators for three-phase low-voltage insulated wires.Patent applicant: Takatake Seisakusho Co., Ltd. Figure 2 (b) Straw Figure 5

Claims (1)

[Claims] In a power supply display that uses a display section including a liquid crystal display element attached to each phase of a three-phase low-voltage insulated wire to indicate that voltage has been applied, one of the two terminals of the display section. is connected to a current collector plate attached around an insulated wire to form a display main body, and the other terminals of the three display parts of the three display main bodies are connected to each other. Power charging indicator for three-phase low-voltage insulated wires