KR102680528B1 - live line and dead line displaying appaatus of elbow connector for ground distribution facilities - Google Patents

Abstract

The present invention relates to a life and death indicator that detects the power induced from a test point of an elbow connector provided with a test point and is connected to a terminal of a ground distribution device that accommodates a cable and has an enclosure on the ground, and indicates whether the cable is alive or dead, It is disposed opposite to the test point and includes a silicon steel plate made of silicon material in the shape of a plate, and a drive unit connected to the silicon steel plate to charge the electric power induced through the silicon steel plate and display the device by flashing it to the outside through a light source. According to this life and death indicator of the ground distribution equipment elbow connector, the structure is simple while improving the utilization efficiency of power transmitted through the test point, and it provides the advantage of improving visual recognition efficiency.

Description

{live line and dead line displaying appatus of elbow connector for ground distribution facilities}

The present invention relates to a life and death indicator of a ground distribution equipment elbow connector, and more specifically, to a life and death indicator of a ground distribution equipment elbow connector that emits light by power supplied through a test point to indicate an electrical continuity state. This project is the result of research on the Jangseong-gun Industrial and Agricultural Complex Revitalization Support Project, which was carried out with the support of Jeonnam Techno Park, funded by Jangseong-gun.

Distribution transformers usually include overhead transformers installed on electric poles and ground transformers installed in urban underground cable areas.

Among these, overhead transformers have a relatively small capacity (outside the city) and are easy to construct or expand, but it is very dangerous to install and supply high-voltage distribution lines to electric poles in crowded metropolitan cities, so power outlets are usually installed underground. etc. are installed, distribution power lines are buried underground, and ground transformers are installed at regular intervals to supply power. For ground transformers, a transformer with a relatively large capacity is installed in one location and supplies power due to limitations such as excavation and occupied space.

Low-voltage power lines deliver low voltage (110/220/380V) converted from an overhead pole transformer or ground transformer to the end-user building through an overhead or underground route to reach the user.

In addition, ground switch refers to a switch device that is installed at the entrance to a facility that requires large amounts of power and is used to connect and disconnect electricity in a certain area due to live wire work and overload in summer. These ground switches are composed of connecting materials, insulating caps, etc. The connecting materials are mainly used in load switches connected to distribution cables, and are divided into dead break type and stick-operable type depending on the purpose. It can be divided into: The stick operation type was mainly used in the early days. Compared to the dead break type, it has the disadvantage of having to use an electroscope pin to directly detect the charging part, which is dangerous and inconvenient, and takes up a lot of installation space, so it is not used in new switchgear. The trend is not. The dead break type has the advantage of being able to safely detect electricity with a capacitive detector by utilizing the charging current of the test point and has the advantage of being easy to work with due to its small installation space. Currently, most dead break type switch connection materials are used.

The liveness indicator insulating cap of the switch connection material is an insulating cap applied to the dead break type. Before checking the liveness of the line using a capacitive detector at the test point, the liveness of the line can be checked with the naked eye through a light emitting circuit to determine whether the line is energized. Safety can be increased when working with cables and operating switches by making the user aware of the presence or absence of the device. The insulating cap is an accessory installed on the connecting material for the purpose of minimizing the risk of damage to the connecting material itself and increasing insulation stability since a voltage of more than 20,000 volts is induced in the wiring cable flowing into the connecting material.

Meanwhile, various types of accidents occurred during cable work and operation of ground switches, and the main reason for this was the failure to properly determine whether high voltage was flowing in the wiring cable. Therefore, it is necessary for ground switches equipped with connecting materials, insulating caps, etc. to provide a method of promoting safety when working with live wires. As for the connecting material, elbow connecting material (hereinafter referred to as elbow connector) is widely used and has been proposed in various ways, such as in domestic registered patent No. 10-0379667.

Additionally, Domestic Patent Publication No. 10-2011-0042578 proposes a life and death display insulating cap that displays the life and death status of a wiring cable through a test point.

However, the insulating cap has the disadvantage of consuming some of the organic power in driving the divider unit formed of an IC integrated circuit, thereby relatively reducing the power allocated for emitting life and death indicator light. In addition, there is a need for a method to further increase the efficiency of using power supplied through test points.

The present invention was created to solve the above requirements, and its purpose is to provide a life and death indicator for a ground distribution equipment elbow connector with a simple structure while improving the utilization efficiency of power delivered through a test point.

In order to achieve the above object, the life and death indicator of the elbow connector of the ground distribution equipment according to the present invention is connected to the terminal of the ground distribution equipment provided with an enclosure on the ground to accommodate the cable, and is connected to the terminal of the elbow connector provided with the test point. A life and death indicator that detects the power and displays whether the cable is alive or dead, comprising: a silicon steel plate disposed opposite the test point and formed of a silicon material in a plate shape; and a driving unit connected to the silicon steel plate to charge the electric power induced through the silicon steel plate and display the device to flash to the outside through a light source.

According to one aspect of the present invention, the silicon steel plate and the drive unit may be formed integrally with the elbow connector.

In addition, a cap housing formed to accommodate the silicon steel plate and the driving unit and made of an insulating material to be detachable from the test point; and a plurality of gripping pieces that extend from the cap housing to be spaced apart from each other so that a user can hold them when the cap housing is separated from the test point.

Preferably, the light source may be configured to use a light-emitting diode, and the light-emitting diode may be arranged to emit light so that its optical axis is inclined with respect to the test point.

In addition, the drive unit includes a secondary coil coupled to the silicon steel plate that functions as a primary coil; a rectifier, one end of which is connected to one end of the secondary coil to rectify the electric energy induced in the secondary coil; a capacitor connected between the other end of the rectifier and the other end of the secondary coil to charge the current supplied through the rectifier; a first diode having an anode connected to one end of the capacitor to supply power charged in the capacitor to a light emitting diode applied as the light source; a second diode connected in series with the first diode; An emitter terminal is connected to the other end of the secondary coil, a cathode is connected to the other end of the light emitting diode whose end is connected to the cathode of the second diode, and a current limiting resistor whose end is connected to the cathode of the second diode and a switching element whose other end and base terminal are connected.

In addition, the rectifier may be a diac, and the silicon steel plate may be constructed to surround all of the exposed test points.

According to the life and death indicator of the ground distribution equipment elbow connector according to the present invention, the structure is simple while improving the use efficiency of power delivered through the test point, and it provides the advantage of improving visual recognition efficiency.

1 is a side view showing a state in which the life and death indicator is separated from the elbow connector of a ground distribution facility according to the present invention;
Figure 2 is a perspective view of the life and death indicator of Figure 1;
Figure 3 is a driving circuit diagram of the life and death indicator of Figure 1;
Figure 4 is a side view showing a state in which the life and death indicator is separated from the elbow connector of a ground distribution facility according to another embodiment of the present invention.

Hereinafter, the life and death indicator of the ground distribution equipment elbow connector according to a preferred embodiment of the present invention will be described in more detail with reference to the attached drawings.

Figure 1 is a side view showing a state in which the life and death indicator is separated from the elbow connector of a ground distribution facility according to the present invention, and Figure 2 is a perspective view of the life and death indicator of Figure 1.

Referring to Figures 1 and 2, the life and death indicator 100 according to the present invention includes a cap housing 110, a grip piece 120, a silicon steel plate 130, a drive unit 140, and a light emitting diode 160. do.

The cap housing 110 is removable from the test point 25 of the elbow connector 20.

Here, the elbow connector 20 can be connected to the terminal 60 provided inside the enclosure 50 of the ground distribution device 70, which accommodates the cable 10 and has an enclosure 50 on the ground, and is made of a conductive material. The test point 25 is formed to be exposed to the outside, and the detailed structure is known, so further detailed description will be omitted. The ground distribution device 70 may be a ground transformer or a ground switch.

The cap housing 110 is coupled to the test point 25 of the elbow connector 20 and can detect the power derived from the test point 25 to display the liveness or absence of the cable 10 through the light emitting diode 150. It is designed to be installed with a built-in driving element.

The cap housing 110 is exposed on the side of the elbow connector 20 and has an internal space 112 with an open bottom so that it can be entered and fitted into the protruding test point 25, and includes a silicon steel plate 130 and a silicon steel plate 130 to be described later. It is formed in a cylindrical shape to accommodate the drive unit 140, and has a structure in which a display hole 114 through which the light emitting diode 150 is exposed and emits light to the outside is formed at the top. The display hole 114 extends obliquely from the cap housing 110 at an angle of 45 degrees so that the light emitting diode 160 can be partially inserted at an angle of 45 degrees and is formed to penetrate the internal space 112.

The cap housing 110 is made of an insulating material.

The gripping piece 120 extends rearwardly and spaced apart from the lower portion of the outer surface of the cap housing 110 so that the user can hold it when separating from the test point 25 of the cap housing 110. .

The grip piece 120 has protruding bands 120 formed in parallel arcs along the extending direction and spaced apart from each other to prevent slipping.

The gripping piece 120 is used to fasten the cap housing 110 to the test point 25 of the elbow connector 20 using a hand stick (not shown) equipped with two clamp-shaped gripping tools at the ends. do.

The cap housing 110 and the grip piece 120 may be made of a flame-retardant insulating material, for example, a synthetic rubber material.

In addition, when separating or removing the cap housing 110 fastened to the test point 25 of the elbow connector 20, the two holding pieces 120 are held in a direction that approaches each other through the two holding holes of the hand stick. After releasing the compressed air in the cap housing 110, hold one grip piece 120 and move the hand stick in the direction in which it is pulled out to separate it.

The silicon steel plate 130 is formed in a disk shape and is mounted inside the cap housing 110.

The silicon steel plate 130 is mounted to face and closely adhere to the test point 25 while the cap housing 110 is coupled to the test point 25, and is made of a silicon material with high permeability. It is done.

The driving unit 140 is connected to the silicon steel plate 130 and charges the power induced through the silicon steel plate 130 to display the circuit board 142 so as to flash externally through the light emitting diode 150 applied as a light source. A driving circuit element is mounted on the top, and the detailed structure will be described with reference to FIG. 3.

Referring to FIG. 3, the drive unit 140 includes a secondary coil 144, a diac 146, a capacitor 148, a basic resistor 149, first and second diodes 151 and 152, and a switching device. It is provided with an element 153.

In FIG. 3, reference numeral 130a indicates an equivalent circuit in which the silicon steel plate 130 functions as a primary coil. Unlike the example shown, it can be constructed in a structure in which the primary coil is separately connected to the silicon steel plate 130. Of course.

The secondary coil 144 is coupled to the silicon steel sheet 130, which functions as a primary coil, and receives the electric energy induced in the silicon steel sheet 130.

One end (146a) of the diac 146 is connected to one end (144a) of the secondary coil 144 to support current conduction in both directions.

The diac 146 is applied as an example of a rectifier that rectifies the electric energy induced in the secondary coil 144.

The capacitor 148 is connected between the other end 146b of the diac 146 and the other end 144b of the secondary coil 144 to charge the current supplied through the diac 146.

The basic resistor 149 is connected between the diac 146 and the capacitor 148 in parallel with the capacitor 148. The basic resistance 149 determines the voltage for the electric energy induced through the secondary coil 144, and a large resistance value is applied to minimize the power consumed by current conduction.

The first diode 151 has an anode connected to one end of the capacitor 148 to supply the power charged in the capacitor 148 to the light emitting diode 150 applied as a light source.

The second diode 152 is connected in series with the first diode 151 in the forward direction.

The light emitting diode 160 is applied as a light source, and one end is connected to the cathode of the second diode 152 in the forward direction. The detailed structure of the arrangement will be described later.

The switching element 155 is such that the voltage charged in the capacitor 148 is higher than the voltage at which current can flow through the first and second diodes 151 and 152, so that the first and second diodes 151 and 152 are When conductive, it is connected to the light-emitting diode 160 so that current can be constantly supplied to the light-emitting diode 160.

That is, the switching element 155 is a light emitting diode 160 whose emitter terminal 155b is connected to the other end 144b of the secondary coil 144 and one end of which is connected to the cathode of the second diode 152. A cathode is connected to the other end, and the base terminal 155a is connected to the other end of the current limiting resistor 157, one end of which is connected to the cathode of the second diode 152.

According to this driving circuit, when AC power is supplied to the cable 10, the electric energy induced through the secondary coil 144 through the silicon steel plate 130 is half-wave rectified and charged in the capacitor 148. When the voltage of the capacitor 148 exceeds the voltage that turns on both the first and second diodes 151 and 152, for example, 1.4 volts, the first and second diodes 151 and 152 are conducted, The switching element 153 is also turned on by applying a turn-on voltage through the base terminal 155a, and the light emitting diode 160 emits light. When the light emitting diode 160 emits light, a constant current is supplied to the light emitting diode 160 according to the current conduction ratio determined by the current limiting resistor 157 of the switching element 155, and the light emission intensity is maintained stably accordingly. do. Thereafter, when power is consumed by the light emission of the light emitting diode 160 and the charging voltage of the capacitor 148 falls below 1.4 volts, the first and second diodes 151 and 152 are turned off and the light emitting diode 160 is also turned off. The light turns off.

Therefore, in a state where AC power is supplied to the cable 10, the light emitting diode 160 performs a blinking operation that repeats turning on and off according to the AC cycle period and a time constant determined by the capacitor 148 and the effective resistance value. do.

It is desirable that the blinking cycle of the light emitting diode 160 is approximately 1 second.

In contrast, when AC power is cut off in the cable 10, the light emitting diode 160 remains unlit.

Meanwhile, the light diffusion central axis P of the light emitting diode 160 is disposed at an angle so that it can be easily recognized in the operator's field of vision when the light emitting diode 160 repeats blinking. That is, the light emitting diode 160 is tilted so that the optical axis (P) of the light emitting diode 160 is inclined with respect to the reference line (S) parallel to the surface that is the upper surface of the test point 25 at the center of the test point 25. ) is disposed within the cap housing 110 and is constructed to emit light. Here, the reference line S corresponds to a horizontal plane along the opening surface of the cap housing 110 of the life and death indicator 100.

In addition, the angle (a) at which the optical axis (P) of the light emitting diode (160) is inclined with respect to the reference line (S) parallel to the surface of the test point (25) is 30 to 60 degrees, and is preferably applied at 45 degrees.

In this case, the blinking drive pattern of the light emitting diode 160 is much more visible in the field of view of a worker approaching to grasp the elbow connector 20, providing the advantage of increasing the recognition rate of the live wire state.

Alternatively, as shown in FIG. 4, the optical axis of the light emitting diode 160 may be installed perpendicularly at 90 degrees to a reference line parallel to the surface of the test point. In this case, the corresponding display hole can also be formed in a corresponding position so that the light emitted from the light emitting diode installed perpendicular to the surface of the test point can be emitted.

Meanwhile, it is of course possible to form irregularities on the surface of the transparent molding cap surrounding the light emitting diode 160 or apply a Fresnel lens to increase the diffusion angle of light emitted from the light emitting diode 160.

In addition, although not shown, it goes without saying that the silicon steel plate 130 and the drive unit 140 can be formed integrally with the elbow connector 20 to form a fixed structure.

In addition, it is desirable that the light emitting diode 160, the circuit elements that drive the light emitting diode 160, and the circuit board 142 are all treated to be waterproof. As an example, all conductive and exposed driving circuit elements including the connection terminal of the light emitting diode 160 may be coated or molded with a waterproof material.

Meanwhile, the structure for improving organic power use efficiency by the silicon steel plate 130 will be described in more detail below.

First, the body part of the elbow connector 20 is shielded, and only the test point 25, which is the part for the electrostatic tap, is not shielded, so a leakage magnetic field is detected through the test point 25.

The electric field generated by the leaking magnetic field (H) is

It is expressed as Equation 1 below.

As can be seen from Equation 1 above, the electric field generated by the leakage magnetic field (H) is proportional to the size of the magnetic flux density.

Additionally, the magnetic flux density B is

The relationship with the magnetic field (H) is expressed in Equation 2 below.

Therefore, if we substitute equation 2 into equation 1,

It is expressed by the mathematical formula below.

In addition, the leakage magnetic field (H) is proportional to the current I flowing through the cable 10, which is a conducting wire, and inversely proportional to the square of the distance (R ² ), according to Biot-Savart's law.

Therefore, the leakage magnetic field (H) is proportional to the magnitude of the current flowing in the internal conductor of the elbow connector 20, and the intensity of the electric field generated by the leakage magnetic field is proportional to the magnetic flux density B, so if the current in the conductor is constant, the magnetic field intensity H Since is constant, the magnitude of magnetic flux density B increases as the permeability (μ) increases.

Table 1 below compares the magnitude of magnetic permeability for each metal plate.

division matter

)Specific permeability (

) paramagnetic body vacuum One air One aluminum 1.000022 platinum 1.000026 ferromagnetic material steel 5000 cobalt 250 nickel 600 silicon steel 7000 diamagnetic material silver 0.999974 copper 0.9999904 water 0.9999912

는 진공의 투자율

에 대한 비 투자율이고,

인 관계를 갖는다.here,

is the permeability of vacuum

is the relative permeability,

have a personal relationship.

As can be seen in Table 1 above, silicon steel has the highest relative magnetic permeability.

Therefore, the silicon steel plate 130 can maximize the intensity of the electric field caused by the leakage magnetic field.

In addition, in order to find the size of the silicon steel plate 130 that maximizes the electric field induced by the leakage magnetic field (H), the following electromagnetic analysis is followed.

Magnetic flux density B is expressed as Equation 4 below.

의 관계가 있으므로 수학식 4는 아래의 수학식 5로 표현할 수 있다. 여기서, ε는 유전율이고, S는 누설면적이다.Here, the total velocity density D is

Since there is a relationship, Equation 4 can be expressed as Equation 5 below. Here, ε is the dielectric constant and S is the leakage area.

Therefore, if the leakage electric field E is constant, it can be seen that the larger the leakage area S is, the larger the magnetic flux density B is.

Therefore, in order to maximize the leakage magnetic flux density for electromagnetic detection through the death point 25 of the elbow connector 20, it is necessary to form a structure that completely covers the magnetic field leakage area in order to maximize the size of the silicon steel plate 130 used as the induction steel plate. desirable.

As an example, the silicon steel plate 130 may be formed to have a groove in which all the test points 25 are accommodated inside, so that it can surround all the exposed test points 25.

In addition, as the distance from the leakage site increases, the strength of the leakage magnetic field decreases in proportion to the square of the distance, so a structure in which the silicon steel plate 130 is completely adhered to the test point 25 is applied.

According to the life and death indicator of the ground distribution equipment elbow connector described above, the structure is simple while improving the use efficiency of power transmitted through the test point, and it provides the advantage of improving visual recognition efficiency.

110: Cap housing
120: scrap piece
130: Silicon steel plate
140: Drive unit
150: light emitting diode

Claims (6)

In the life and death indicator that detects the power induced from the test point of the elbow connector provided with the test point and connected to the terminal of the ground distribution equipment that receives the cable and has an enclosure on the ground, and indicates whether the cable is alive or dead,
a silicon steel plate disposed opposite the test point and made of a silicon material in a plate shape;
a drive unit connected to the silicon steel plate to charge the power supplied through the silicon steel plate and display the light by repeatedly turning on and off to the outside through a light source to blink;
a cap housing formed to accommodate the silicon steel plate and the driving unit and made of an insulating material to be detachable from the test point;
a plurality of gripping pieces extending from the cap housing to be spaced apart from each other so that a user can hold them when the cap housing is separated from the test point,
The driving unit is
a secondary coil coupled to the silicon steel plate that functions as a primary coil;
a rectifier, one end of which is connected to one end of the secondary coil to rectify the electric energy induced in the secondary coil;
a capacitor connected between the other end of the rectifier and the other end of the secondary coil to charge the current supplied through the rectifier;
a first diode having an anode connected to one end of the capacitor to supply power charged in the capacitor to a light emitting diode applied as the light source;
a second diode connected in series with the first diode;
An emitter terminal is connected to the other end of the secondary coil, a cathode is connected to the other end of the light emitting diode whose end is connected to the cathode of the second diode, and a current limiting resistor whose end is connected to the cathode of the second diode A switching element to which the other end of and the base terminal are connected,
The rectifier is a life and death indicator of a ground distribution equipment elbow connector, characterized in that a diac is applied. delete delete The life and death indicator of a ground distribution equipment elbow connector according to claim 1, wherein the light source is a light-emitting diode, and the light-emitting diode is disposed so that its optical axis is inclined with respect to the test point to emit light. delete The life and death indicator of a ground distribution equipment elbow connector according to claim 1, wherein the silicon steel plate is formed to surround all of the exposed test points.

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