KR100560917B1 - Magnetic field detecting apparatus - Google Patents

Abstract

A magnetic field detection device, which is provided in a symmetrical manner to guide an electric wire to the magnetic field detection unit and minimizes mechanical friction during ground resistance measurement, and is provided in a symmetrical manner from the inlet side to the inner side. A pair of guide members, opposite the inlet side of the guide members to maintain the guide member closed by applying the same force to the pair of guide members when the wire is inserted between the pair of guide members A leaf spring inserted into an insertion hole provided at the side, a support having both sides of the pair of guide members and having a U-shaped groove in a portion into which the electric wire is inserted, and preventing the opening state of the guide member from exceeding a predetermined range. In order to the guide member stop groove formed in the support and the pin formed in the guide member By providing a first stopper portion and a second stopper portion for blocking the guide member on the side of the guide member, the contact area is kept constant every time of measurement, the configuration for restoring the guide member can be simplified, and the mechanical friction is minimized. And the core and the guide member are not impacted, and the guide member is not twisted even when the electric wire is twisted between the guide members.

Guide member, ferrite core, SCT / DCT, magnetic field detector

Description

Magnetic field detection device {MAGNETIC FIELD DETECTING APPARATUS}

1 is a perspective view of a remote ground resistance automatic measuring device using a magnetic field detection apparatus according to the present invention

2 is a plan view of the upper case of the ground resistance meter shown in FIG.

3 is a plan view of the lower case of the ground resistance meter shown in FIG.

4 is a plan view of the guide member and the core of the grounding resistance meter shown in FIG.

5 is a plan view showing an open state of the guide member shown in FIG.

6 is an internal structure diagram of a detector core provided in a guide member;

7 is a view showing a state diagram of a remote ground resistance automatic measuring device using a magnetic field detection apparatus according to the present invention, a state diagram before insertion of the ground wire

8 is a view showing a state diagram of a remote ground resistance automatic measuring device using a magnetic field detection apparatus according to the present invention, showing a state in which the ground wire is inserted

Figure 9 is a schematic diagram of measuring the ground resistance of the pole using a conventional ground resistance meter

10 is a structural diagram of a conventional grounding resistance measuring instrument

<Description of the symbols for the main parts of the drawings>

101... . Ground wire, 102.. Detector                 

103... Display unit 104. Control panel

105... Coupling portion, 141... Guide member

142... Core portion 143... Hinge shaft

145... Elastic member, 146... Stopper member

147... Guide hole

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic field detection device, and more particularly, to a magnetic field detection device capable of measuring a current flowing in a distribution line, and in particular, a ground resistance at a point where a neutral wire enters the upper pole.

Since the magnetic field detection device for measuring the current flowing in the distribution line forms a part of the configuration of the remote ground resistance automatic measuring device in the present invention, hereinafter, except for the different parts, the remote grounding resistance automatic measuring device will be described.

In general, the multi-grounded neutral wire is built into the pole, which is constructed to prevent electric shock from external contact, and the only place where the ground resistance can be measured is the place where the neutral wire enters the pole. Therefore, it is necessary to ride the last week for the measurement. This means risking the inconvenience of the passengers and the risk of electrical accidents.

In addition, there is a ground resistance meter that clamps the entire body of the pole, but it is heavy, and it is very difficult to measure the ground resistance, so electric engineers tend to avoid it, and thus, it is not possible to efficiently manage the ground. There is a demand for the development of a ground resistance meter that can measure the ground resistance easily and safely in a multiple grounded distribution line.

According to this request, as shown in FIG. 9, a method of measuring ground resistance in a concrete pole structure using a ground resistance meter is disclosed in Korean Utility Model Publication No. 20-0169790.

In FIG. 9, the leakage current of the arrester 2 and the transformer 9 is used as a power source for measuring the ground resistance of the concrete pole, and the leakage current flowing from the power source is measured using the clamp type current transformer 31.

In addition, since the inlet is adjusted by the deflectable control rod, the current transformer 31 has a structure in which an operator can operate it from the ground and hang it on the electric wire. The deflectable control rod has a shape that is refracted to a size that can be mounted on a passenger car or the like.

The current measured by the current transformer 31 is processed by the built-in processor 34 and used as an element for calculating the ground resistance, and the terminal near the concrete among the grounding terminals 22 for measuring earth potential is possible. It is placed close to one concrete so that all earth potential rise applied to concrete pole is measured.

In Fig. 9, reference numeral 33 denotes a leakage current transfer wire, and reference numeral 35 denotes a ground potential measurement lead wire.

However, in the structure shown in Fig. 9, there is no specific description of how the current transformer 31 is inserted into the neutral wire and measured.                         

In addition, the structure of the measuring device is disclosed in Korean Patent Publication No. 1986-0002118.

10 is a structural diagram of a grounding resistance meter described in the above patent publication.

In Fig. 10, reference numeral 47 denotes a cut out switch (COS) insulating operating rod, reference numeral 48 denotes a current meter body, reference numeral 48a denotes a coupling portion, reference numeral 49a denotes a spring shaft, and 50a is a wire mesh, and 51 is a micro switch.

In the measuring device shown in FIG. 10, the coupling part 48a formed at the lower end of the current meta body 48 is attached to the upper end of the COS insulated operating rod 47, and then the power switch SW1a (SW1b) is turned on. If the wire chuck core 50, 50a is caught in a live high-voltage cable path, the wire claw core 50, 50a is elastically open from the spring shaft 49, 49a, and the wire path is microswitched. 51).

At this time, the lead relay is closed, and the electric wire is locked to the wire core 50 and 50a, and the electric current generated by the magnetic field flowing through the wire is connected to the clamp CT and induced in the secondary coil. The induced current has a structure in which the voltage obtained through the unit resistance R is rectified in the detector circuit, and the numerical value appears on the liquid crystal display panel through amplification and oscillation in the converter circuit.

However, in the structure as described above, since the wire stitching cores 50 and 50a are separately provided on the spring shafts 49 and 49a, respectively, when a wire is inserted into either side of the iron core, a force is applied to only one side of the spring shaft. This causes distortion.

As a result, the wires are not inserted correctly, resulting in measurement errors and mechanical damage to the measuring device itself.

In addition, even when the wire is inserted, as shown in FIG. 10, the space for forming the contact point between the wire and the micro switch is large, so that it is difficult for the measurer to determine whether the wire is correctly contacted with the micro switch 51. In addition, the measurer must make these measurements repeatedly to ensure accurate measurements.

An object of the present invention is to solve the above problems, to provide a magnetic field detection device that does not cause distortion by minimizing mechanical friction when measuring the current or ground resistance of the distribution line.

Another object of the present invention is to provide a magnetic field detection device in which a distribution line or a ground line is accurately guided into a core so that a measurement error does not occur.

In order to achieve the above object, the magnetic field detection device of the present invention is provided with a left-right symmetry to guide the wire to the magnetic field detection unit, respectively, and one side is fixed to the hinge shaft and the other side is inclined toward the inside from the inlet side to accommodate the wire A pair of guide members having guide holes for the first guide member, and when the electric wire is inserted between the pair of guide members, the same force is applied to the pair of guide members to maintain the guide member in a closed state. Leaf springs inserted into insertion holes provided on opposite sides of the inlet side of the guide members, covering both sides of the pair of guide members and having a U-shaped groove in a portion where the electric wire is inserted. In order to prevent the opening state of the support and the guide member from exceeding a predetermined range, A first stopper portion formed by a pin guided through the guide member blocking groove and the blocking groove of the guide member and fixed to the first support body and the second support member, and a second member blocking the guide member from the side surface of the guide member. It is characterized by including a stopper part.

Further, in the magnetic field detecting device of the present invention, the magnetic field detecting unit is provided with an annular core cut in half for detecting an electrical signal on the outside of the U-shaped groove.

Further, in the magnetic field detecting device of the present invention, the diameter of the guide hole portion formed in the pair of guide members may be defined by the U-shaped grooves formed in the first and second supports formed on both surfaces of the guide member. It is characterized by being less than the diameter of the circular portion.

Hereinafter, the present invention will be described in detail with reference to the drawings. In addition, in the figure, the same code | symbol is attached | subjected to the same part, and the repeated description is abbreviate | omitted.

1 is a perspective view of a remote ground resistance automatic measuring device using a magnetic field detection device according to the present invention. In Fig. 1, reference numeral 101 denotes a ground wire to be measured, 102 denotes a detector for guiding and clamping the ground wire and detecting a ground resistance of the ground wire, 103 denotes a display unit indicating the measured ground resistance, and 104. Is an operation unit for operating a set value for measurement, 105 is a coupling portion with the COS operating rod for connecting from the ground to the position of the ground line.

In addition, an electronic circuit for measuring ground resistance is built in the operation unit 104.

That is, in the present invention, the measurer connects the coupling portion 105 of the measuring instrument shown in FIG. 1 to the COS operating rod 47 as shown in FIG. Is used by clamping the detector 102.

Next, the structure of this detection part is demonstrated in detail according to FIG. 2 is a plan view of the upper case of the ground resistance meter shown in FIG. 1, FIG. 3 is a plan view of the lower case of the ground resistance meter shown in FIG. 1, and FIG. 4 is a guide member of the ground resistance meter shown in FIG. And a plan view of the core portion, FIG. 5 is a plan view showing an open state of the guide member shown in FIG. 4, FIG. 6 is an internal structural diagram of a detection unit core provided in the guide member, and FIG. 7 is a magnetic field detecting device according to the present invention. A diagram showing a state of use of the remote ground resistance automatic measuring device, which is a state diagram before insertion of a grounding wire. FIG. Drawing.

2 and 3, reference numeral 120 and 130 denote a support for supporting the guide member, reference numeral 121 denotes an opening that is open for viewing from the outside by mounting the display unit 103, and reference numeral 122 denotes an operation unit. The operation panel of the.

Further, 123 and 133 are insertion holes of the guide pins of the stopper which prevent the guide member from being forcibly opened, and 124 and 134 are hinge shaft holes for keeping the guide member open and closed. . Reference numeral 135 is a coupling member corresponding to the coupling portion 105.

As can be seen in Figures 2 and 3, the support 120 (130) inside the U-shaped grooves are formed to insert and support the ground wire.                     

In addition, in FIG. 4 and FIG. 5, 141 is a guide member which consists of a pair of left and right, The guide member 141 is provided with the core accommodating part 140 which accommodates the core 142 mentioned below, The diameter of the portion constituting the guide hole 147 in the guide member 141 is equal to or smaller than the diameter of the portion constituting the guide hole 147 in the supports 120 and 130.

Reference numeral 142 is a manganese-based ferrite core portion formed in an annular shape to apply an electrical signal to the ground wire, and cut in half to insert the ground wire.

In addition, 143 is a hinge shaft for holding each guide member to slide left and right, 144 is an insertion hole of the elastic member, 145 is inserted into the insertion hole 144 as shown in Figs. After the ground wire is inserted into the inlet side of the guide member 141, it is an elastic member made of a leaf spring to maintain the original closed state.

146 is a guide member blocking groove made to prevent the pin 151 from being inserted at a predetermined angle, for example, 24 ° or more when the ground wire is inserted into the left and right guide members 141, and 147 are respectively. The guide hole made of a semi-circle inside the guide member 141 of the.

In addition, as shown in FIG. 6, the core unit 142 has a voltage of the oscillation signal according to the ground resistance and the core 148 for the SCT (Source CT) for applying a current of a special frequency to the ground line. And a core 149 for a DCT (Detect CT) for detecting the amount of change.

Next, the function of this core part 142 is demonstrated.

Wind the coil to open and close the structure of the cut core and allow the ground wire 101 to enter the inside of the SCT core 148, and then apply the measurement oscillation signal 4.4 에 to the coil of the SCT core to make a magnetic ground. Voltage 101 is induced by the magnetic path inside the core.

The voltage induced in the ground line 101 is applied to a closed circuit composed of the ground resistance of the ground, and the ground line 101 flows a current that changes according to the ground resistance, and the DCT core 149 is a method for detecting the current flowing in the ground line. To prepare.

In other words, the coil applying the oscillation signal to the SCT is the primary, the ground wire 101 is the secondary of the SCT, and at the same time the primary of the DCT.

When the coil wound on the DCT core 149 is made to be 3rd, current flows to the secondary coil of the ground line by the voltage applied to the primary, and the voltage is induced to the DCT tertiary coil by the secondary coil current. To measure the voltage. The magnitude of this voltage is determined by the current through the ground wire.

This current flows more when the ground resistance value is low, whereas less current flows when the ground resistance value is high.

If the SCT primary voltage is kept within the primary power consumption range of the SCT, the induced voltage induced in the secondary (ground line) of the SCT is considered to be constant, and the primary internal impedance of the SCT is constant. When the voltage applied to the constant voltage is a constant voltage, the voltage induced in the secondary of the SCT can be considered to be constant according to the coil turns ratio. According to the ground resistance value, the current flowing in the secondary coil (ground wire) of the SCT changes according to the ground resistance, but the magnitude of the voltage induced in the secondary coil of the SCT does not change.                     

That is, the power consumption of the SCT is represented by the product of the voltage induced by the SCT secondary and the primary current, and the current flowing through the ground wire, which is the secondary of the SCT and the primary of the DCT, is determined by the ground resistance value. The ground resistance can be measured using the value of the current.

That is, the ground resistance may be measured by applying a high frequency oscillation signal to the SCT to convert the current induced in the DCT secondary into a ground resistance value using the DCT.

If the voltage detected by the DCT is high, the ground resistance is small. If the voltage detected by the DCT is low, the ground resistance is high.

With this principle, the electrical high frequency signal for ground resistance measurement can be indirectly supplied to the ground wire, and the ground resistance can be measured by the combination of the SCT function and the DCT function.

Next, the operation of the measuring device using the magnetic field detecting device according to the present invention will be described with reference to FIGS. 7 and 8.

The measurer pushes the measurer to the inlet side of the guide member 141 with respect to the grounding line 101 to measure the grounding resistance of the distribution line by coupling the coupling portion 105 to the COS operating rod. Since the left and right guide members 141 are inclined inward from the inlet side, the ground wire 101 easily moves to the center of the pair of guide members 141.

As the measurer keeps pushing the meter, as shown in FIG. 8, the guide member 141 spreads from side to side and the ground wire 101 is seated in the guide hole 147.

At this time, the guide member 141 is kept open only to a predetermined range by the groove 146 and the pin 151, and after the ground wire is seated, the original closed state by the restoring force of the leaf spring 145, that is, And return to the state of FIG.

In addition, the guide member 141 is opened only to a predetermined range not only by the groove 146 and the pin 151 but also by the anti-tuck 152 as shown in FIG. 1.

Here, the guide member 141 is configured to move only between the supports 120 and 130, so that the guide member 141 is prevented from being twisted even when the electric wire enters the twisted state with the guide member 141.

In addition, as shown in FIG. 6, since a measurement error due to noise may occur between the SCT and the DCT in the core unit 142, the interference of the measurement signal is minimized by double the electrical shielding and the contact surface of the core. As shown in FIG. 8, the mechanical inductance is guided to maintain a constant position so that the mutual inductance does not change.

After the measurement is completed, the ground wire 101 is separated from the guide member 141 by simply pulling down the meter.

In the above description, the embodiment of the remote ground resistance automatic measuring device has been described, but in the magnetic field detecting device for measuring the current of the distribution line, the core for the SCT is not necessary, and only the core for the DCT is possible.

As mentioned above, although this invention was demonstrated concretely according to the said Example, this invention is not limited to the said Example, Of course, it can change in various ways within the range which does not deviate from the summary.

As described above, according to the remote ground resistance automatic measuring device or the current measuring device using the magnetic field detecting device of the present invention, the effect of enabling remote measurement and minimizing the individual error of the measuring person is obtained.

In addition, since the restoring force using only one leaf spring of the measuring instrument acts equally to the left and right guide members, the contact area of the core is kept constant every measurement, and the configuration for restoring the guide members can be simplified, and the mechanical friction is minimized. And the core and the guide member are not impacted to achieve the long life of the measuring instrument.

Further, even when the ground wire is twisted between the guide members, the guide member is not twisted.

In addition, the magnetic field detection device of the present invention is to open the guide member to a predetermined range only by the locking action by the groove formed in the guide member and the pin formed on the support and the anti-wetting action by the buckling prevention jaw to clamp the ground wire thicker than the diameter of the guide hole. Even if it does not become a clamp, the guide member is not damaged.
In addition, in the magnetic field detecting device of the present invention, since the grounding wire should be inserted into the U-shaped groove of the support, the guide member is not damaged even when trying to clamp to the grounding wire thicker than the diameter of the U-shaped groove. .

Claims (3)

A pair of guide members each provided symmetrically for guiding the electric wire to the magnetic field detecting unit and having one side fixed to the hinge axis and having a surface inclined toward the inside from the other inlet side and a guide hole for receiving the electric wire, An opposite side of the inlet side of the guide members about the hinge axis to maintain the guide member closed by applying the same force to the pair of guide members when the electric wire is inserted between the pair of guide members Leaf spring inserted into the insertion hole provided in the First and second supports covering both surfaces of the pair of guide members and having a U-shaped groove in a portion into which the electric wire is inserted; In order to prevent the open state of the guide member from exceeding a predetermined range, a pin penetrates the guide member blocking groove formed in the guide member and the blocking groove of the guide member and is fixed to the first support and the second support. With the first stopper part And a second stopper portion for blocking the guide member from the side of the guide member. The method of claim 1, And said magnetic field detecting unit is provided with an annular core cut in half for detecting an electrical signal outside of said U-shaped groove. The method of claim 1, Magnetic field detection, characterized in that the diameter of the guide hole portion formed in the pair of guide members is equal to or less than the diameter of the circular portion of the U-shaped grooves formed in the first and second supports formed on both surfaces of the guide member. Device.

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