JP2703398B2 - Voltage detector - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power detection device arranged in a three-phase electric line and used for detecting a line current, a line voltage, and the like.

[Prior Art] A conventional power detector of this type is disclosed in, for example,
A configuration as shown in Japanese Patent No. 96568 is known.

In this conventional device, a core made of a magnetic material is provided so as to surround an electric wire, a secondary winding is provided on the core, and a secondary load resistance for voltage detection and a voltage sensor head are connected to the core. Is housed and arranged away from the core,
The secondary winding provided on the core, the secondary burden resistance, and the sensor head were connected by a lead wire.

[Problems to be Solved by the Invention] However, in this conventional power detection device, since the voltage sensor head is disposed apart from the core, a large accommodation space for the sensor head is required in the container. There is a problem that the whole device becomes large, and it is necessary to connect the core and the sensor head with a lead wire, and the connection work is very troublesome.

The present invention has been made in view of such a problem existing in the related art, and it is an object of the present invention to secure a large accommodation space for a sensor head in an insulating container. In addition, the present invention can provide a power detection device that can reduce the size of the entire device, and does not require connection between the core and the sensor head by a lead wire, and can simplify the connection work. is there.

Means for Solving the Problems In order to achieve the above object, the present invention divides a cutout annular core made of a magnetic material into an upper core and a pair of lower cores, and An outer peripheral side is gripped by an upper holder, an outer peripheral side of the pair of lower cores is gripped by a conductive lower holder, and an electric wire is inserted inside the core to connect the left and right ends of the upper and lower holders. Means, the lower holder is connected to an insulating container, a magnetic field sensor head is interposed between the pair of lower cores, and a signal line of the sensor head is drawn out from one end of the insulating container. A first electrode is disposed on the inner peripheral side of the first electrode, and the lower holder is used as a second electrode, and both electrodes are connected to a voltage sensor head via lead wires.

[Operation] In the power detection device configured as described above, the core is divided and the magnetic field sensor head is interposed between the divided portions, so that a large housing for the sensor head is accommodated in the insulating container. Since there is no need to secure a space, the entire device is reduced in size, and since there is no need to connect the core and the sensor head with a lead wire, the connection can be easily performed.

Furthermore, since the holder is divided and the electric wire is clamped between the divided portions, the holder can be used as an electric wire clamp, and the structure can be simplified. It can be easily arranged coaxially with the electric wire.

In addition, in the present invention, the first electrode is provided on the inner peripheral side of the core, and the lower holder is used as the second electrode, and both electrodes are connected to the voltage sensor head via the lead wires.
Voltage detection can be performed by the second electrode and the first electrode which also serve as a holder, so that the number of components can be reduced and the size of the detection device can be reduced.

[Embodiment] Hereinafter, an embodiment of a power detection device embodying the present invention will be described.
This will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, a detection unit 1 serving as a detection means is supported by being suspended from an electric wire 2 while gripping the electric wire 2, and detects a line current and a line voltage. The cylindrical insulating container 3 is connected and fixed to the lower surface of the detection unit 1 via a conductive joint plate 4, and an insulating jacket 5 having an insulating fold 5a is fitted around the outer periphery thereof.

Therefore, the configuration of the detection unit 1 will be described in detail. As shown in FIGS. 1 and 3, a core 6 made of a magnetic material is used.
Is an upper core 6A having a substantially U-shaped front shape and a substantially L-shaped front core.
It is configured by being divided into a pair of lower cores 6B and 6C in a letter shape. The conductive holder 7 is divided into an upper U-shaped upper holder 7A and a U-shaped lower holder 7B. In a state where the upper core 6A is joined to the lower surface of the upper holder 7A, they are integrally fixed by applying a rubber mold 8 to their outer surfaces, and the lower cores 6B and 6C are joined to the upper surface of the lower holder 7B. In this state, they are integrally fixed by applying a rubber mold 9 to the outer periphery thereof.

As shown in FIGS. 1 to 3, a pair of tightening portions 10 and 11 are formed on both sides of an upper holder 7A and a lower holder 7B, respectively. The cores 6A, 6B, and 6C are clamped in a state of surrounding the electric wire 2 by inserting the bolt 13 between the tightening portions 10 and 11 and tightening the nut 13 with the nut 14. The plurality of mounting pieces 15 are formed so as to protrude from the bottom plate of the lower holder 7B, and a plurality of bolts 16 are screwed into the joint plate 4 via the mounting pieces 15, so that the joint plate 4 While being electrically connected and fixed to the lower holder 7B,
By inserting a plurality of bolts 17 into the joint plate 4 from the lower surface of the upper end flange portion 3a of the insulating container 3 and tightening the bolts with the nuts 18, the insulating container 3 is attached to the lower surface of the joint plate 4.

The through hole 19 is formed at the center of the lower holder 7B so as to match the gap between the opposed ends of the lower cores 6B and 6C.
A through hole 20 is also provided at the center of the joint plate 4 corresponding to 19. Magnetic field sensor head 21 is lower core
By applying the rubber mold 9 in a state of being inserted into the gap between the opposed ends of the lower cores 6B and 6C and the through hole 19 of the lower holder 7B, the lower cores 6B and 6C are integrally interposed and fixed between the lower cores 6B and 6C. When the plate 4 is mounted, the plate 4 protrudes into the through hole 20.

A pair of mounting grooves 22 are formed so as to face inner side surfaces of the lower cores 6B and 6C, and an electrode support plate 23 made of an insulating plate is provided between the mounting grooves 22. The first electrode 24 is the lower core 6
By being fixed to the upper surface of the electrode support plate 23 by screws 25 so as to be located between B, 6C and the electric wire 2, by applying the rubber mold 9 with the electrode support plate 23 and the first electrode 24 mounted, They are integrally fixed between the lower cores 6B, 6C. And in this embodiment, the first
A second electrode facing the electrode 24 is formed, and the holder 7 serving as the second electrode is looped around the core 6 and the first electrode 24.

As shown in FIG. 1, an insulating substrate 26 is provided in the insulating container 3, and a mounting plate 27 is provided upright on the upper surface thereof.
The capacitor 28 and the voltage sensor head 29 are mounted on the side surface of the mounting plate 27, and are connected to the first electrode 24 and the holder 7 as the second electrode via the lead wire 30.

As shown in FIGS. 1 and 4, a pair of guide portions 31 each composed of two ridges 31a are provided to oppose the lower halves on both sides of the inner surface of the insulating container 3 and are parallel to the axial direction of the insulating container 3. Extends to.

Signal lines 32 and 33 made of optical fibers are
It is connected to the magnetic field sensor head 21 or the voltage sensor head 29 in the detecting section 1 and is inserted through the insulating substrate 26.
The tension wires 34 are fixed to the insulating substrate 26 at the upper end, and are housed in the protective tube 35 in a state of being aligned with the signal lines 32 and 33, and they are connected to the lower end of the insulating container 3 from the lower end of the insulating container 3. It is pulled out through the protective cover 36 fitted and fixed to the cover. The holder 37 is attached to the outer periphery of the upper end of the protection tube 35 for holding the signal lines 32 and 33, and is composed of a pair of holding bodies 38 and a holder 39. A pair of locking projections 40 are provided on the outer periphery of the holder 37, and the locking projections 40
Are movably locked in the vertical direction by the guide portion 31 in the insulating container 3, the rotation of the holder 37 is restricted, and the signal lines 32 and 33 are prevented from being twisted.

An elastic insulating layer 41 made of urethane rubber or the like and having excellent adhesiveness is filled and formed in the lower half of the insulating container 3. In the insulating layer 41, the insulating substrate 26, the holder 37, and the signal lines 32 and 33 are formed. It is included. A high-viscosity insulating fluid 42 made of silicon grease or the like is filled in the upper half of the insulating container 3, and the insulating fluid 42 contains the capacitor 28, the voltage sensor head 29, and the leads 30 and signal wires 32 corresponding thereto. The connection is immersed.

Next, the operation of the power detection device configured as described above will be described.

Now, in this voltage detector, the core 6 is the upper core 6A.
And a pair of lower cores 6B and 6C.
Since the magnetic field sensor head 21 is interposed between the divided portions of B and 6C, the influence of other phases in the three-phase electric line does not appear on the magnetic field sensor head 21, and the detection of line current and the like is performed for each phase. Can be done accurately. According to this configuration,
Since there is no need to secure a large accommodation space for the magnetic field sensor head 21 in the insulating container 3, the entire device is reduced in size, and there is no need to connect the core 6 and the magnetic field sensor head 21 with a lead wire. Therefore, the connection work can be easily performed.

Further, in this embodiment, since the holder 7 is divided into an upper holder 7A and a lower holder 7B and the electric wire 2 is sandwiched between the divided portions, the holder 7 is used as an electric wire clamp. And the structure can be simplified, and the upper holder 7A and the lower holder
By connecting the core 6A and the core 6A, the cores 6A, 6B, and 6C can be easily arranged coaxially with the electric wire 2.

Further, in the above embodiment, the first electrode 24 provided on the electrode support plate 23 is used.
The voltage sensor head 29 is multifunctional so that the voltage of the electric wire 2 can be divided and detected by the voltage sensor head 29 by utilizing the electrostatic capacitance between the electric wire 2 and the lower holder 7B.

[Effects of the Invention] Since the present invention is configured as described above, it has the following excellent effects.

(1) According to the present invention, the core is divided into three parts into an upper core and a pair of left and right lower cores, and the magnetic field sensor head is interposed between the divided parts of the two lower cores. The influence of the phase does not appear on the sensor head, and the detection accuracy can be improved. In addition, according to this configuration, it is not necessary to secure a large accommodation space for the sensor head in the insulating container, and it is possible to reduce the size of the entire device and to connect the core and the sensor head with a lead wire. There is no need for connection, and the connection work can be simplified.

(2) According to the present invention, since the holder is divided and the electric wire is held between the divided portions, the holder can be used as an electric wire clamp, and the structure can be simplified, and The core can be easily arranged coaxially with respect to the electric wire.

(3) According to the present invention, the first electrode is disposed on the inner peripheral side of the core, and the lower holder is used as the second electrode, and both electrodes are connected to the voltage sensor head via the lead wires. Can be performed by the second electrode and the first electrode which also serve as the holder, and therefore, the number of parts can be reduced, and the size of the detection device can be reduced.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of a voltage detecting device embodying the present invention, FIG. 2 is a side view of a main part thereof, FIG. The figure is A- of FIG.
FIG. 3 is a sectional view taken along line A. 2 ... wire, 3 ... insulating container, 6 ... core, 6A ... upper core, 6B, 6C ... lower core, 7 ... holder, 7A ... upper holder, 7B ... lower holder, 13 ... Bolts as connecting means, 14 nuts as connecting means, 21 magnetic field sensor heads, 29 voltage sensor heads, 30 lead wires,
32 ... Signal line.

Continuation of front page (56) References JP-A-62-132178 (JP, A) JP-A-62-90545 (JP, A)

Claims (1)

(57) [Claims] A notched annular core made of a magnetic material;
Is divided into an upper core (6A) and a pair of lower cores (6B, 6C), and the outer peripheral side of the upper core (6A) is gripped by an upper holder (7A), and the pair of lower cores (6B, 6
The outer peripheral side of C) is gripped by a lower holder (7B) having conductivity, and an electric wire (2) is inserted into the inside of the core (6) so that both right and left ends of the upper and lower holders (7A, 7B) are provided. Are connected by connecting means (13, 14), the lower holder (7B) is connected to the insulating container (3), and a magnetic field sensor head (21) is interposed between the pair of lower cores (6B, 6C). Dressed up
The signal line (32) of the sensor head (21) is pulled out from one end of the insulating container (3). Further, a first electrode (24) is provided on the inner peripheral side of the core (6), and the lower holder ( 7
B) as a second electrode, and both electrodes (24, 7) as lead wires (30,
A voltage detector connected to the voltage sensor head (30) via the (30).