KR20040095131A - Voltage & amp. signal acqusiator for power meter electric leak detector etc. - Google Patents

Abstract

PURPOSE: An apparatus for detecting currents and voltages of a power meter and an electric leakage detector is provided to detect an insulated state of a power line by measuring the amount of power and the amount of leakage currents without cutting the power line. CONSTITUTION: A core as a flux path is divided into a lower core and an upper core. An induction coil is wound around one of the lower core and the upper core. A lead wire is connected to the induction coil in order to be connected to a PCB. The lower core is installed on a lower assembly substrate(500). The upper core is installed on an upper assembly substrate. A stacked structure of the lower assembly substrate, a power line, and the upper assembly substrate is formed by using a couple of bolts and a couple of nuts. A load current and a leakage current are detected from the power line.

Description

Current and voltage detectors such as power meters and earth leakage detectors {VOLTAGE & AMP. SIGNAL ACQUSIATOR FOR POWER METER ELECTRIC LEAK DETECTOR ETC.}

The present invention relates to a device for detecting a voltage, a load current and a leakage current which are input signals of a device for detecting power and a short circuit.

In more detail, when the load current and the leakage current flow through the power line, the magnetic flux is generated in the core surrounding the power line, and the core of the current transformer which calculates the current value with the voltage induced by the magnetic flux is shown in FIG. The lower core 201 and the upper core 202 are divided into one, the lower assembly plate and the other one in the upper assembly plate, the coil is induction coil wound around the upper core and the electric current flowing between the lower assembly plate and the upper assembly plate Tighten a pair of bolts assembled bolts are combined to form a current transformer to detect the current.

At the same time, the guide groove for guiding and fixing the wires through which load current flows in the center of the lower assembly plate with the lower core and the center of the upper assembly plate with the upper core passes through the insulation coating of the wires through which the load current flows. A voltage detecting pin is provided for contacting a conductor wire through which a voltage signal is detected and for supplying power to the electronic detection circuit.

Among the pair of assembly plates, the lower assembly plate 500 has a power line guide groove 502 for guiding and fixing the wires through which load current flows to a predetermined position, and the lower core 510 for detecting load current and a leakage current at both sides. There is a lower core 520 for detection. The upper assembly plate 400, when the upper assembly plate 400, the lower assembly plate 500 is assembled to the power line guide groove 502 for guiding and fixing the wire flowing the load current of the lower assembly plate, the power line in the lower assembly plate There is a voltage detecting pin 404 at a position corresponding to the central portion of the power line 100 at the predetermined position guided by the guide groove 502, and the load current detection secondary coil on the upper core 421 for detecting the load current on both sides. The leakage current detector 420 includes a load current detector 410 formed by winding 412 and a leakage current detecting secondary coil 422 wound around the leakage current detecting upper core 411. The upper assembly plate 400 and the lower assembly plate 500 are fastened to the assembly nut (female thread) 505 in the central portion of the lower assembly plate 500 with the power line 100 interposed therebetween fixing bolts at the center of the upper assembly plate. When the upper and lower assembly plates 400 and 500 are tightened with bolts through the holes, current transformers for detecting load current and current transformers for detecting leakage current are formed, and at the same time, a voltage signal is connected from a current flowing wire, thereby requiring a current meter and an earth leakage detector. And a device for detecting a voltage signal.

Without the need for the troublesome work of cutting power lead wires and connecting them to terminals like a conventional power meter, by removing a pair of top and bottom assembly plates, inserting the power lead wires in a fixed position, and tightening one bolt, the input signal of the power meter and the earth leakage detector is obtained and Calculate power consumption and leakage current simultaneously through the electronic circuit assembled directly connected to the assembly plate 400, and obtain the device that can transfer all the information data through the power line to the computer installed in the central monitoring board. It can be installed on the power line that is drawn from the breaker secondary to the outlet in the distribution box without the need for a meter box. It is an object of the present invention to detect a power amount and calculate an electric charge, and at the same time detect a current leakage amount to prevent a fire and an accident caused by a current leakage.

Conventionally, as shown in FIG. 1, an input terminal and an output terminal are separately installed in a power meter, and a power line is cut to connect an input terminal and an output terminal. For this reason, if the connected terminal is loosened or the input terminal and output terminal are shorted, power metering is not possible. At the same time, it is necessary to manufacture and install the power meter box, install the power meter inside, connect the power lines, and seal the power meter box.

In addition, an earth leakage breaker is installed on the power line inlet side, and this earth leakage breaker cuts off the power line without notice when a leakage current of more than a certain amount of current (approximately 30 MA) occurs, causing a lot of inconvenience to consumers, Accidents occur, causing a lot of physical loss.

The present invention researched and developed to solve the above problems is a technology for solving this problem by focusing on the fact that all work is completed by simply fastening the device according to the present invention without cutting the power line introduced into the load. The task is to solve the instability of the current signal due to the change of magnetic resistance when the gap is generated by separating and assemble the core, which is a magnetic path, to obtain a current signal proportional to the current of the power line.

The tip of the needle type penetrating the insulation coating of the power line and making contact with the inner wire should be in close contact with the conductor wire. The temperature change is repeated with a long time, and all the tightened parts repeat shrinkage expansion according to the temperature change. As a result, loosening or play may occur. It is a technical problem of the present invention to manufacture a structure of a pair of up and down assembly plates manufactured in pairs to solve this problem and to supply a voltage signal and device driving power stably at a semi-permanent contact.

1: Connection diagram of existing power meter and earth leakage breaker

2 is a cross-sectional view showing the configuration of the current transformer for current detection

3 is a partial cross-sectional view showing the configuration of the voltage detection device

4 is a detailed view of an upper assembly plate mounted with a voltage detection device and a part of two current detection current transformers.

Fig. 5 is a detailed view of a lower assembly plate mounted with a voltage detection device and a part of two current detection current transformers.

6: perspective view of the apparatus according to the present invention

7 is an appendix view of the overall configuration of the electric power amount and the leakage current amount detecting device according to the present invention;

[Description of Signs of Important Parts in Drawing]

100: power line 101: circuit breaker switch

102: current transformer for current leakage detection 103: solenoid for circuit breaker

201: Lower core of current transformer for current detection

202: "" Upper Core

203: "" Secondary coil

204: "Second Coil Reed Wye"

301: printed circuit board 302: lead wire

303: voltage detection pin 304: upper assembly plate body (plastic)

305: rubber plate for moisture proof and pin protection 306: insulation of power line

307: internal conductor wire of the power line 308: power line guide groove

309: lower assembly plate body (plastic)

400: upper assembly plate

401: Guide groove for inserting the upper assembly plate and the lower assembly plate in position when assembling

402: voltage detection pin 403: assembly bolt hole

404: voltage detection pin 405: rubber plate for moisture proof and protection

406: load current signal line 407: voltage signal line

408: leakage current signal line

410: current transformer for detecting load current

411: current transformer upper core (202) for detecting the load current

412: secondary coil of current transformer for detecting load current

420: Current transformer for detecting leakage current

421: Upper core of "" "

422: "" "Secondary Coil

500: lower assembly plate

501: When assembling the upper assembly plate and the lower assembly plate protrusion for inserting in place

502: power line guide groove (308) 503: assembly bolt hole

504: leaf spring which maintains the force that the voltage detecting pin and the power line conductor can always come into contact with a certain pressure

505: Assembly nut (female thread)

510: lower core 201 of the current transformer for load current detection

511: The leaf spring for generating the force pushing the lower core and the upper core of the current transformer for detecting the load current

520: lower core of the current transformer for current leakage detection

521: A leaf spring that pushes the lower core and the upper core of the current transformer for leakage current detection always close

601: Assembly bolt

701: power supply and voltage signal detection unit 702: load current detection unit

703: leakage current detection unit 704: central processing unit (MICRO PROCESSOR)

705: DATA storage unit 706: power line transmission unit

In order to solve the technical problem, the current and voltage detection device is divided into an upper assembly plate 400 and a lower assembly plate 500, and a power line guide groove in which a power line is fixed at a predetermined position in a central portion of the lower assembly plate 500 ( 502), the lower core 510 for the load current detection at the positions respectively defined at both sides, and the lower core 520 for the leakage current detection, and the lower core for the load current detection are pushed up below the lower core 510 for the load current detection. A leaf spring 511 for generating a lifting force is provided so that the lower core 510 is inserted into the upper core 411 by the elastic force of the leaf spring so that there is no play between the lower core and the upper core.

In addition, in order to assemble the upper assembly plate and the lower assembly plate correctly assembled, the lower assembly plate 500 has a protrusion 501 on both sides of the central portion, and the assembly nut (female screw) 505 is placed at the center.

The central part of the upper assembly plate 400 has a voltage detecting pin 402 penetrating the insulation coating of the power line and contacting the conductor line, and the voltage detecting pin is covered with a moisture proof and pin protection rubber plate 405.

On both sides of the upper assembly plate 400, there is an earth leakage current detector 420 on which one side has an upper core 421 for earth leakage detection, and an upper core for earth leakage detection has a secondary coil 422 wound around the earth leakage detection circuit. There is an upper core 411 for detecting a load current and an upper current core for detecting a load current includes a current transformer 410 for detecting a load current in which a load current detecting secondary coil 412 is wound.

And the upper assembly plate central portion at both sides of the upper assembly plate 400 and the lower assembly plate 500 is placed in the concave recessed portion 401 to be assembled to fit in place. As described above, after placing the power line in the power line guide groove 502 of the lower assembly plate 500, the upper assembly plate 400 is formed on both sides of the center of the lower assembly plate so that the lower assembly plate can be assembled in place. (501) and the convex portion (401) on both sides of the upper assembly plate 400 to be coupled to each other and put a bolt in the assembly bolt hole 403 of the center of the upper assembly plate and fit the nut for mounting the lower assembly plate (505) When tightening the bolts, the voltage detecting pin 402 penetrates the covering of the power line and contacts the conductor wires to conduct a voltage signal to the electronic circuit, and the load current detecting current transformer and the earth leakage detecting current transformer are assembled to perform their functions. . However, in order to make contact between the voltage detecting pin 402 and the conductor wire at a constant contact pressure, there is a plate spring 504 having a mounting nut (female thread) 505 attached under the lower assembly plate 500. The detection pin 402 pushes and maintains a constant pressure toward the conductor wire.

Around the voltage detection pin 402, a moisture-proof and pin protection rubber plate 405 formed of foamed rubber surrounds the voltage detection pin 402, and the moisture-resistant rubber plate 405 has an upper assembly plate and a lower assembly plate separated from each other. In the state, the voltage detecting pin 402 is hidden in the porous foam waterproof rubber plate so that the voltage detecting pin 402 is placed on the power line guide groove 502 of the lower assembly plate 500, and then the voltage is detected when the upper assembly plate 400 is assembled. When the pin 402 enters through the insulation coating of the power line, the pin 402 comes into close contact with the heat transfer coating, thereby preventing the voltage detection pin 402 and the inner conductor line of the power line from contacting air and by moisture and oxygen contained in the outside air. The conductor of the power line and the voltage detecting pin 402 serve to prevent oxidative corrosion.

In addition, the core, which is a passage of magnetic flux induced by the load current and the leakage current, is divided into a lower core and an upper core, and two cores separated from the lower assembly plate 500 and the upper assembly plate 400 are combined for a long time. Accordingly, since the expansion and contraction is repeated due to the change in temperature, when the pores are formed in the assembled two cores, the change in the magnetic flux induced by the pores may come.

In order to solve this problem, when the upper core 202 of the current detecting current transformer of FIG. 2 is U-shaped, both protrusions are not balanced, and the lower core 201 of the current detecting current transformer has an elastic force of the leaf spring 511. Both sides of the lower core 201 and the protrusions of the upper core 201 maintain a slight inclination angle at the same angle so that the lower core 201 is in close contact with both protrusions of the upper core 202 when pushed in the direction of the arrow. Under the lower core, put the leaf spring of the same size as the lower core and tighten the fastening bolts when assembling the upper assembly plate and the lower assembly plate. The leaf springs (511,521) supporting the (520,510) generate an elastic force and push the lower core (520,510) to the upper core (411,421) at a constant pressure by the elastic force, and thus the upper assembly plate (400) due to the passage of time. It does not generate voids that may occur due to deformation of the lower assembly plate 500.

The upper assembly plate has a voltage signal line 407 connected to a voltage detecting pin contacted with a conductor of a power line through a power line insulating coating, and a load current signal line 406 of a current transformer 410 for detecting a load current. Each of the leakage current signal lines 408 is drawn as shown in FIG. 4, and the lead wires are directly connected to the printed circuit board.

The lower part of the printed circuit board forms a shielding layer to protect the electronic components of the printed circuit board from noise generated by the strong current of the lower power line.

The voltage signal line 407 introduced into the electronic circuit serves to supply a power supply voltage for operating all the electronic circuits centering on the MICRO PROCESS 704 in the power supply and voltage signal detection unit 701. At the same time, the voltage signal for calculating the amount of power and the load current signal voltage input to the load current signal line 408 are input to the voltage signal corresponding to the load current value and the leakage current signal line 407 by the load current detection unit 702. The three types of voltage signals, which are converted into voltage signals corresponding to the leakage current values by the leakage current detection unit 703, are the ANALOG values, which are DC voltage signal values that the central processing unit 704 can recognize, The processing unit 704 is converted into a digital value by an A / D converter and processed to calculate and calculate all necessary data such as power consumption, power factor, leakage current, real time, and power consumption over time. The data DATA is stored in the DATA storage unit 705. Since the DATA storage unit 705 uses the EPROM, the DATA storage unit 705 is stored for a long time even in a state where all DATA values are out of power.

The power line transmission unit 706 transmits and stores all data DATA calculated by the central processing unit 704 through a power line (wire) to perform remote meter reading and safety management. Thus, a power meter and an earth leakage detector are obtained which do not require a separate weak current communication line.

By simply connecting the device of the present invention to the power line without cutting the power line, the current and voltage flowing through the power line are sensed to measure the amount of power and the amount of the leakage current to recognize the insulation state of the cable line, resulting in a power failure without notice. You can eliminate the inconvenience.

Since the power line is not cut, the inconvenience caused by the power failure and the loss caused by this can be reduced. Since there are no wires connected to the outside, it can be installed with simple operation without separate construction in the existing facilities when replacing it with the unmanned automatic meter reading integrated electricity meter. It has an effect.

In addition, the leakage of the cable line occurs because the insulation state of the cable line is poor, and the cause of the insulation state defect is caused by moisture in the insulation coating of the rusted wire. This does not happen suddenly, but gradually over a long period of time, so it is possible to prevent the accident of power failure without notice in case of maintaining and maintaining the electric line by continuously measuring and managing the leakage current.

In addition, MICRO PROCESS, which performs arithmetic processing and manages arithmetic data, has the ability to perform many functions. Therefore, if only a short circuit current detection signal is inputted, it does not require any necessary materials. You can do it.

Claims (3)

In FIG. 2, the core of the magnetic flux path is divided into the lower core 201 and the upper core 202. The induction coil 203 is wound around the divided core, and the lead wire 204 is connected to directly connect the electronic circuit board. 4, the two lower cores divided as shown in FIG. 5 are installed in the lower assembly plate 500, and the upper cores are installed in the upper assembly plate, respectively. Current transformer for detecting load current and leakage current formed by tightening In FIG. 3, the power line guide groove 308 formed in the lower assembly plate 309, the voltage detection pin 303 provided in the upper assembly plate 304, and the lead wire 302 connected to the pin are the electronic circuit board 301. 4) and a component of the porous rubber plate 305 which protects the insulation coating damage of the power line generated by connecting a voltage signal to the voltage detecting pin and penetrating the insulation coating of the power line to contact the inner conductor line. As shown in Fig. 5, the pair of bolts and nuts are tightened with the lower assembly plate 500 and the upper assembly plate 400 installed between the wires, so that elastic force is generated in the leaf spring 504, and the elastic conductor wire 307 and the voltage detection pin 303 maintains a constant pressure to contact the voltage detection connection device does not occur contact failure The two current signal detection current transformers of claim 1 are connected to the voltage detecting device of claim 2 on the lower assembly plate 500 and the upper assembly plate 400, respectively, and tighten the pair of fastening bolts and nuts for the upper and lower assembly plates. Apparatus for supplying input signals to power meters, leakage current detectors, etc., having the function of simultaneously detecting the voltage and current formed