KR102369617B1 - Current transformer for high output power supply easily installed in underground transmission line with improved waterproof/dustproof function - Google Patents

Abstract

The present specification provides a power current transformer for a power supply device that converts a primary current flowing in a distribution line into a secondary current through electromagnetic induction, wherein the power current transformer includes a plurality of terminals based on a constant number of turns to control the output current current transformer connected to; and a short-circuit switch that short-circuits both ends of the current transformer in order to prevent high voltage generated by the opening of the output terminal of the current transformer, so that power can be supplied in response to a change in the distribution line, and it is easy to install on an underground transmission/distribution line And it is possible to provide a current transformer for power supply for a power supply with improved waterproof/dustproof function.

Description

CURRENT TRANSFORMER FOR HIGH OUTPUT POWER SUPPLY EASILY INSTALLED IN UNDERGROUND TRANSMISSION LINE WITH IMPROVED WATERPROOF/DUSTPROOF FUNCTION}

Embodiments disclosed in the present specification relate to a current transformer for power supply for a power supply device, and more particularly, it is possible to supply power in response to a change in a distribution line, is easy to install on an underground transmission/distribution line, and has improved waterproof/dustproof function. It relates to a current transformer for a power supply for a power supply device.

Currently, underground distribution lines are being built in areas where it is impossible to construct overhead distribution lines, or for various reasons such as the creation of new development complexes and safety. Accordingly, the need for safety accident prevention is emerging, and various devices for measuring, monitoring, measuring, or diagnosing for various safety are installed on underground distribution lines. However, since there is no separate power source to operate these devices underground, a separate power source such as a solar cell or an external power source is required, and various problems occur due to installation or cost.

For example, in the case of a solar cell, since it generates power by sunlight, it cannot be used on a cloudy day or in a shady area, and it is difficult to secure an installation place because it requires a separate installation place. Accordingly, power is supplied to the distribution line by using a magnetic field conversion power supply device or the like.

However, as the existing power supply device is designed on the assumption that a constant distribution current flows, it is difficult to cope with the frequently changing distribution line, so it is difficult to secure sufficient power at a small current, and the risk of a safety accident increases at a large current. There was a problem.

Moreover, due to the development of technology, the power used in a measuring instrument installed on a distribution line, for example, a device having a function of measuring, monitoring, measuring, or diagnosing, etc. is increasing. There was a need for a problem.

In addition, there is no ground switch having a waterproof/vibration-proof structure because the humidity is greater than 90% and the temperature of the ground switch is -20 to -70 ° C.

Accordingly, there is a need for a technique for solving the above-mentioned problems.

On the other hand, the above-mentioned background art is technical information that the inventor possessed for the purpose of derivation of the present invention or acquired during the derivation process of the present invention, and it cannot be said that it is necessarily known technology disclosed to the general public before the filing of the present invention. .

Embodiments disclosed in the present specification have an object to present a current transformer for a power supply for a power supply device capable of supplying power in response to a change in a distribution line.

Embodiments disclosed in the present specification have an object of providing a current transformer for a power supply for a power supply that is easy to install on an underground transmission and distribution line and has improved waterproof/dustproof function.

As a technical means for achieving the above-described technical problem, according to an embodiment, in a current transformer for a power supply for a power supply that converts a primary current flowing in a distribution line into a secondary current through electromagnetic induction, the current transformer for power, a current transformer connected to a plurality of terminals based on a constant number of turns to adjust the output current; and a short-circuit switch that short-circuits both ends of the current transformer to prevent a high voltage generated according to the opening of the output terminal of the current transformer.

In addition, the current transformer for power includes two cases having a ring shape divided into which the current transformer is introduced, one end of each of the two cases is connected in a hinge form, and the other end is coupled to each other through a bolt. A groove is formed.

In addition, the current transformer for power includes two cases having a ring shape divided into which the current transformer is introduced, and coupling grooves that can be coupled through bolts are formed at both ends of each of the two cases.

The power current transformer may include: a shelf to which the power current transformer is fixed; And it is fixed using a structure including a support for supporting the shelf.

The current transformer for the power supply, a wire reel fixed to the ceiling; and wires connected to the wire reel and connected to holes formed in at least a portion of the current transformer for power.

The current transformer for power includes two cases having a divided octagonal ring shape for the current transformer to be drawn in, and coupling grooves that can be coupled through bolts are formed at both ends of each of the two cases, and the two cases face each other. A silicon O-ring is formed on the surface to seal the inner space.

The two cases, except for the cut surface of the current transformer, the inner space is filled with epoxy (Epoxy) is molded.

The current transformer for power is formed in a divided ring shape corresponding to the size of the inner space of each of the two cases, and further includes a heat dissipation unit through which the current transformer is introduced into the inner space to receive and release heat from the current transformer. And, the heat dissipation unit forms a plurality of heat dissipation blades extending outwardly along the outer circumferential surface.

According to any one of the above-described problem solving means, it is possible to provide a current transformer for power supply for a power supply device capable of supplying power in response to a change in a distribution line.

In addition, according to any one of the above-described problem solving means, it is possible to provide a current transformer for a power supply device that is easy to install on an underground transmission and distribution line and has an improved waterproof/dustproof function.

1 is a diagram illustrating a measurement system including a power supply according to an embodiment.
2 is a block diagram illustrating a power supply device according to an embodiment.
3 is a diagram illustrating a current transformer for power according to an embodiment.
4 is a diagram illustrating an installation structure of a current transformer according to an exemplary embodiment.
5 is a diagram illustrating an installation structure of a current transformer according to another exemplary embodiment.
6 is a diagram illustrating a structure for fixing a current transformer for a power source according to an embodiment.
7 is a view showing a structure for fixing a current transformer for power according to another embodiment.
8 is a diagram illustrating a connection between a current transformer for power and a power supply unit according to an exemplary embodiment.
9 is a diagram illustrating a maximum voltage limiter according to an exemplary embodiment.
10 is a graph illustrating an operation of adjusting a voltage according to a reference voltage in a maximum voltage limiter according to an exemplary embodiment.
11 is a diagram illustrating circuits for protecting a power supply unit according to an exemplary embodiment.
12 is a graph illustrating an operation waveform of a field effect transistor according to an exemplary embodiment.
13 is a diagram illustrating an output unit according to an exemplary embodiment.
14 is a diagram illustrating a measurement display unit according to an exemplary embodiment.
15 is a diagram for explaining a voltage/current display operation for checking power supplied to a measuring instrument according to an exemplary embodiment.
16 and 17 are views illustrating an installation structure of a current transformer according to another embodiment.
18 is a diagram illustrating a structure for fixing a current transformer for power according to another embodiment.
19 and 20 are views illustrating an installation structure of a current transformer according to still another embodiment.

Hereinafter, various embodiments will be described in detail with reference to the accompanying drawings. The embodiments described below may be modified and implemented in various different forms. In order to more clearly describe the characteristics of the embodiments, detailed descriptions of matters widely known to those of ordinary skill in the art to which the following embodiments belong are omitted. In addition, in the drawings, parts irrelevant to the description of the embodiments are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a component is said to be “connected” with another component, it includes not only a case of 'directly connected' but also a case of 'connected with another component interposed therebetween'. In addition, when a component "includes" a component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a measurement system including a power supply according to an embodiment.

Referring to FIG. 1 , the measuring system 10 includes various measuring instruments 210 and 220 for measuring, monitoring, measuring, or diagnosing various safety measures using a distribution line 20 . The measurement system 10 may include a power supply device 100 for measuring various information from the measuring instruments 210 and 220 and receiving power.

The power supply device 100 may be connected to a distribution line, may provide various information for measurement, and may supply power for operation of the measuring instruments 210 and 220 .

The power supply device 100 may include a current transformer 110 for power and a power supply unit 120 .

The current transformer 110 for power may be connected to the power distribution line 20 or may be located adjacently. The current transformer 110 for power may induce a primary current flowing in the distribution line 20 through which a high voltage flows as a secondary current.

The power supply unit 120 may use the induced secondary current to convert and output the voltage required by the measuring instruments 210 and 220 . The power supply unit 120 may adjust the secondary current so that it can operate in a wide primary current according to the distribution current of the distribution line 20 that is frequently changed therein. Through this, the power supply unit 120 may include a circuit for limiting individual voltages and individual currents for safety when the power required for each of the measuring instruments 210 and 220 is output.

Although the power supply unit 120 exemplarily shows that a plurality of measuring instruments 210 and 220 are connected, one measuring instrument may be connected thereto.

Such a power supply device 100, for example, can output power of 15 watts (W) or more, which can be stably operated at a high current of 30 amps (A) to 200 A directly flowing through the distribution line 20 .

Therefore, when using the circulating current flowing through the metal sheath cross-bonded to the existing distribution line 20, the sheath circulating current generated for reasons such as the influence of other lines, cross-bonding problems, unstable grounding, sudden load fluctuations, and phase inequality is Occurs. The sheath circulating current is not generated in all lines, but is generated nonlinearly by the above-described conditions, and is insufficient to supply power because 5% to 30% or less of the actual current is used. Therefore, it requires multiple power supplies because it only produces a small amount of power, less than 10W. However, the proposed power supply device 100 has a structure capable of outputting power of 15W or more.

2 is a block diagram illustrating a power supply device according to an embodiment.

Referring to FIG. 2 , the power supply device 100 may include a current transformer 110 for power and a power supply unit 120 .

The current transformer 110 for power may include a short circuit switch 111 and a current transformer 112 .

The short-circuit switch 111 may short-circuit both ends of the current transformer 112 to prevent a high voltage generated according to the opening of the output terminal of the current transformer 112 . Conversely, the short-circuit switch 111 may open, that is, connect the current transformer 112 whose both ends are short-circuited.

The current transformer 112 may induce a primary current flowing in the distribution line 20 through which a high voltage flows as a secondary current. The current transformer 112 may output the induced secondary current to the power supply unit 120 . Also, the current transformer 112 may be inserted into a separate case for installation. The current transformer 112 has a structure that is respectively connected to at least two output terminals based on a constant number of turns to adjust the output current.

The power supply unit 120 includes a protection circuit 121 , an input current relay unit 122 , a rectifier circuit 123 , a maximum voltage limiter 124 , a current control unit 125 , an output unit 126 , and a measurement display unit 127 . ) may be included.

The protection circuit 121 prevents at least one of an overvoltage and an overcurrent caused by the secondary current output from the current transformer 110 for power.

The input current relay unit 122 may control the turn ratio of the current transformer 110 for power so that a secondary current within a preset allowable current range is input. To this end, the input current relay unit 122 may be connected to each of the output terminals of the current transformer for power, and by switching at least some of the output terminals of the current transformer 110 for power to control the turn ratio of the current transformer 110 for power. there is.

The rectifier circuit 123 converts a secondary current that is an AC voltage input by the turn ratio control into a direct current (DC) voltage. The rectifier circuit 123 may be implemented in the form of a bridge diode.

The maximum voltage limiter 124 may limit the maximum voltage of the DC voltage to a preset reference voltage or less.

The current controller 125 measures the DC voltage and controls the operation of controlling the turn ratio of the input current relay unit based on the measured DC voltage.

The output unit 126 is connected to at least one measuring device, and converts the DC voltage into a voltage required by the measuring device and outputs the converted voltage.

The measurement display unit 127 may display information about the voltage and current output from the output unit.

3 is a diagram illustrating a current transformer for power according to an embodiment.

The current transformer 110 for power may include a short-circuit switch 111 and a circular current transformer 112 .

The short-circuit switch 111 may include a cable ground 1122 and may have a function of short-circuiting the current transformer 112 . Through this, it is possible to ensure the safety of the user during installation, and it is possible to prevent the failure of the current transformer (112). For example, when the current transformer 112 is installed in the distribution line 20, when the output terminals A2 and A3 are opened, the secondary-side impedance rises and a high voltage is generated, which may cause a failure of the current transformer 112. there is. In this case, if the current transformer 112 is short-circuited using the short-circuit switch 111, failure can be prevented.

Meanwhile, the short-circuit switch 111 may be attached to the case 1120 into which the current transformer 112 is introduced.

The current transformer 112 may be specially manufactured to use the primary current flowing in the distribution line 20 as a power source, and may be made of, for example, heat-treated silicon steel sheet, and designed to fit the size of the existing grounding cable. It can have a diameter of 250Φ according to the wire size of various transmission and distribution lines at 65 pi (Φ).

The current flowing in the distribution line increases due to seasonal change, load center, system change, etc., so it has a structure that does not self-saturate even at 1000 A or more, and has the same ratio so that the power supply unit 120 can select the size of the input current The output may be performed with four tabs A1 to A4 formed by the coil 1121 wound to have a predetermined number of turns.

In the case of the distribution line 20 for underground power transmission, it can be submerged in water, so after wiring, epoxy molding is performed inside for waterproofing, and the wires corresponding to the four cores are connected to the power supply unit 120 through the cable grounding to the outside. can The tap switching A1 to A4 may be performed by the power supply unit 120 .

4 is a diagram illustrating an installation structure of a current transformer according to an exemplary embodiment.

Referring to FIG. 4 , two cases 311 and 312 in the form of a divided ring into which the current transformer 112 is introduced are shown. Here, it has a circular shape by combining the first case 311 and the second case 312, and there is a space therein for the distribution line to be located.

One end of the first case 311 and one end of the second case 312 may be coupled to each other in a form spaced apart from each other by a predetermined distance, for example, may be connected in the form of a hinge.

A coupling groove 314 is formed at the other end of the first case 311 , and a coupling groove 315 is formed at the other end of the second case 312 so that the coupling grooves 314 and 315 are connected to each other by bolts or the like. can be combined.

This structure is a clamp type consisting of a cicada ring and a hinge structure, which reduces the installation time, and can provide convenience to users according to installation and removal.

5 is a diagram illustrating an installation structure of a current transformer according to another exemplary embodiment.

Referring to FIG. 5 , the current transformer 112 may include two cases 321 and 322 in the form of a divided ring into which the current transformer 112 is introduced. Coupling grooves 323 and 325 are formed at both ends of the first case 321 , respectively, and coupling grooves 324 and 326 are formed at both ends of the second case 322 , respectively.

The first coupling groove 323 and the third coupling groove 324 are connected to each other through the first bolt 327 , and the second coupling groove 325 and the fourth coupling groove 326 are connected to the second bolt 328 . can be connected to each other using

In an environment that cannot be installed using the clamp type as shown in FIG. 4 , the vertical current transformers 111 separated from the top and bottom are respectively positioned close to the distribution line 20 and assembled using bolts.

In the structure in which the coupling grooves are connected using bolts in FIGS. 4 and 5 , a bolt groove for fastening the bolts may be formed.

4 and 5, the structure in which the defect grooves are connected with bolts has been exemplarily described, but they may be connected using various other elements such as screws, nails, adhesives, and fixing clips.

In these structures, the coil may be divided into two, and in the structure of FIG. 4 , when the first coil and the second coil constituting the current transformer 111 maintain a forward connection state, the upper core and the lower core are coupled state can be maintained, and in the structure of FIG. 5 , since the first coil and the second coil constituting the current transformer 111 have reverse connection, separation is possible.

6 is a diagram illustrating a structure for fixing a current transformer for a power source according to an embodiment.

Referring to FIG. 6 , the current transformer has a structure introduced into the first case 321 and the second case 322 with respect to the distribution line 20 . The two cases 321 and 322 may position the power distribution line 20 on the inside.

In actual power transformers, vibrations are generated in the current transformers due to the magnetized iron core. For example, if a current is used as a power source in a large current such as 30 to 500A, not a low current, if the excitation current generated in the primary side cannot be offset in the secondary side, vibration may be generated in the current transformer due to the excitation current. In reality, it is impossible to eliminate 100% of the primary excitation current in a power transformer, and the current transformer vibrates with a certain degree of magnetization.

For this reason, when the current transformer 110 for power is directly installed on the distribution line, if it is mounted on the cable, the surface of the cable may be damaged due to vibration. For this reason, the current transformer 110 for power, that is, the current transformer cases 321 and 322 is spaced apart from the distribution line 20 by a predetermined distance D.

On the other hand, since most of the distribution lines are installed in close contact with the wall, the current transformer 110 for power can be fixed to the wall using a structure configured using the shelf 331 and the pedestal 312 . At this time, the current transformer 110 for power may be fixed to the shelf with bolts.

7 is a view showing a structure for fixing a current transformer for power according to another embodiment.

Referring to FIG. 7 , cases 321 and 322 of the current transformer for power are shown, and coupling grooves 325 and 326 installed at one end of the case are shown.

The coupling grooves 325 and 326 have holes 345 and 346 through which wires (eg, stainless wires) 342 and 343 can be connected, respectively.

The wires 342 and 343 may be connected to a wire reel 341 for connecting to the ceiling 350 to fix the current transformer.

The current transformer 110 for power may be fixed using a structure configured using the wires 342 and 343 and the wire reel 341 .

8 is a diagram illustrating a connection between a current transformer for power and a power supply unit according to an exemplary embodiment.

Referring to FIG. 8 , the protection circuit 121 protects the power supply unit 120 due to a surge that generates a high voltage and current in a short moment, which is generated due to reasons such as lightning strike, switching of a high-voltage heavy electric machine, or a failure. To this end, the protection circuit 121 may be implemented using at least one of a varistor, a PTC, a fuse, and an X-CAP for protecting the power supply unit 120 from a surge. .

The input current relay unit 122 includes two relay switches (Relay1, Relay2) based on the input signal so that the range of current allowed in the power supply unit 120 can be input regardless of the primary current flowing through the distribution line 20 . ) can be opened and closed. Here, the four terminals A1 to A4 of the current transformer 112 may be connected to the four terminals B1 to B4 in the input current relay unit 122 inside the power supply unit 120 .

Since the secondary current is output in inverse proportion to the number of turns, the input current relay unit 122 may close both relay switches Relay1 and Relay2 in order to use the maximum power in normal times. At this time, the number of turns may be reduced to output the maximum current.

If the secondary-side current increases and exceeds the allowable range in the power supply unit 120, the input current relay unit 122 closes the first relay switch Relay1 and opens the second relay switch Relay2. Thus, the number of turns is primarily increased, and the secondary current can be reduced.

Thereafter, when the secondary current gradually increases, the input current relay unit 122 may open both relay switches Relay1 and Relay2.

As such, the control of the relay switches Relay1 and Relay2 may be performed by the current controller 125 . Therefore, it may be controlled based on the DC voltage measured by the maximum voltage limiter 124 .

The rectifier circuit 123 may be implemented using a bridge diode and a capacitor, and may have an allowable voltage of 100V or more in order to respond to various surges. The secondary current output from the input current relay unit 122 is an alternating current, and the rectifier circuit 123 may full-wave rectify the secondary current using a bridge diode and smooth it with a capacitor to generate a DC voltage.

9 is a diagram illustrating a maximum voltage limiter according to an exemplary embodiment.

Referring to FIG. 9 , the maximum voltage limiting unit 124 is located at the front end of the output unit 126 that is most affected by the high voltage. The output unit 126 may output, for example, a DC voltage of 12V. For example, the output unit 126 has an allowable voltage range of 14V to 35V, and when 60V or more is input, a failure may occur. For this reason, the maximum voltage limiter 124 may limit the voltage to a predetermined voltage preset for safety, for example, about 25V or less.

The maximum voltage limiter 124 may include a comparator 410 and semiconductor switching elements 411 , 412 , and 413 to limit the maximum voltage.

The semiconductor switching elements 411 , 412 , and 413 may include, for example, an oxide semiconductor electric field effect transistor (MOSFET), an insulated gate type bipolar transistor (IGBT), or the like. In this case, the comparator 410 may compare whether the input DC voltage exceeds a reference voltage.

Through this, when the DC voltage is greater than the set reference voltage, the comparator 410 may turn on the semiconductor switching elements 411 , 412 , and 413 to reduce the DC voltage DC+. In this case, the comparator 410 turns off the semiconductor switching elements 411 , 412 , and 413 when the DC voltage is smaller than the set reference voltage. In this case, the comparator 410 may operate at a speed of about 1 megahertz (MHz) or more to limit the maximum voltage of the DC voltage.

10 is a graph illustrating an operation of adjusting a voltage according to a reference voltage in a maximum voltage limiter according to an exemplary embodiment.

Referring to FIG. 10 , when the reference voltage is 20V and the input voltage 510 is greater than or equal to 20V, the maximum voltage limiter 124 turns on the semiconductor switching device to reduce the input voltage 510 . In addition, when the input voltage 510 is less than 20V, the maximum voltage limiter 124 turns on the semiconductor switching device to maintain the input voltage 510 . The maximum voltage limiter may limit the peak voltage of the output voltage 520 to 20v by adjusting the input voltage 510 according to the performance of the above-described operation.

For example, the semiconductor switching device has the ability to consume about 100W or more of power at 25 degrees, so that the maximum voltage can be effectively limited. Here, the consumed power may be dissipated in the form of heat. Since the temperature of the semiconductor switching device increases as power consumption increases, the maximum voltage limiter 124 may connect two or more semiconductor switching devices in parallel. In FIG. 9 , the maximum voltage limiter 124 proposes a structure in which three semiconductor switching elements 411 , 412 , and 413 are connected in parallel.

The maximum voltage limiter 124 may include a thermistor temperature sensor and a cooler for effective heat dissipation. The maximum voltage limiter 124 can measure the temperature using the thermistor temperature sensor, and when it is 50 degrees or more, it operates the cooler to dissipate the heat of the switching element, and when it is less than 50 degrees, it is controlled to stop the operation of the cooler can do.

11 is a diagram illustrating circuits for protecting a power supply unit according to an exemplary embodiment.

Referring to FIG. 11 , a field effect transistor (FET) 611 is a protection circuit included in the current controller 125 .

In this case, the current controller 125 may control, for example, the operation of the FET 611 based on the DC voltage measured by the maximum voltage limiter 124 . Through this, the current controller 125 may output a control signal for controlling the operation of the relay switches of the input current relay unit 122 .

The signal applied to the gate 610 may be a DC voltage of the maximum voltage limiter 124 as a control signal.

For example, when a DC voltage greater than or equal to the reference voltage is sensed, the FET 611 is turned off, and when it is less than or equal to the reference voltage, the FET 611 is turned on.

The FET 620 and the capacitor 622 may be located inside the protection circuit 121 and have a function of blocking the overvoltage when an overvoltage is applied.

Meanwhile, the current controller 125 may limit the maximum voltage for a certain time in the maximum voltage limiter 124 , but as the primary current input to the power current transformer 110 increases, it acts as a burden on the switching element, and a constant voltage If it falls below this, a malfunction may occur in the instrument. In addition, vibration due to the excitation current may occur, resulting in deterioration of performance and damage to the line.

For this reason, the current controller 125 measures the DC voltage using two comparators (a first comparator and a second comparator) having a reference voltage of 20V, and then the DC voltage exceeds the reference voltage, and the maximum voltage limiting unit When the temperature of the switching element of 124 becomes 50 degrees or more, the first comparator is operated to control the second relay switch Relay2 to close, and once again the DC voltage exceeds the reference voltage and the temperature is 50 degrees or more In this case, the second comparator may be operated to control the first relay switch Relay1 to close, thereby limiting the secondary current.

On the other hand, the current controller 125 always measures the DC voltage between the first comparator and the second comparator, and when the primary side current of the power current transformer 110 decreases, the DC voltage decreases below the reference voltage of 20V or less. , it is possible to increase the secondary current of the current transformer for power by opening the relay switches (Relay1, Relay2).

12 is a graph illustrating an operation waveform of a field effect transistor according to an exemplary embodiment.

Referring to FIG. 12 , the FET 620 operates at a speed of several megahertz (MHz) or more and substantially alternates an on operation and an off operation, but may be viewed as direct current on a waveform. An input voltage 630 and an output voltage 640 referenced to the FET are shown.

13 is a diagram illustrating an output unit according to an exemplary embodiment.

Referring to FIG. 13 , the output unit 126 may include a DC output unit 710 and a voltage/current limiter 720 .

The DC output unit 710 may output a DC voltage of about 12V. Here, when the branch output unit 710 is manufactured with one channel, in the case of 100W and 12V, it is necessary to control a current of about 8A or more, so the unit price may increase. In addition, if a power supply failure such as a short circuit occurs due to a power supply problem of each instrument, it may affect other instruments, so the output can be composed of 4 or more individual modules of about 25W.

The voltage/current limiter 720 has a function of limiting voltage and current.

14 is a diagram illustrating a measurement display unit according to an exemplary embodiment.

Referring to FIG. 14 , the measurement display unit 127 may include a filter unit 730 and a voltage/current display unit 740 .

The filter unit 730 may include an inductor and a capacitor to ensure accurate measurement of the instrument.

The voltage/current display unit 740 may include a voltage/current display unit to check the power supplied to each measuring instrument.

15 is a diagram for explaining a voltage/current display operation for checking power supplied to a measuring instrument according to an exemplary embodiment.

Referring to FIG. 15 , switches 811 and 812 for controlling power applied to the instruments are shown.

At the bottom, information windows 821 , 822 , 823 , and 824 showing power and current consumed by the instrument for each channel are shown.

16 and 17 are views illustrating an installation structure of a current transformer according to another embodiment.

16 and 17 , two cases 351 and 352 in the form of a divided octagonal ring into which the current transformer 112 is introduced are shown. Here, the outer circumferential surface has an octagonal shape by the coupling of the first case 351 and the second case 352 , and there is a space for the distribution line to be located therein, and each of the open front surfaces is the cover 3511 and 3521 . ) is sealed by

And, on each surface of the first case 351 and the second case 352 facing each other, a silicone O-ring ( 359) can be sealed.

The current transformer 112 includes two cases 351 and 352 having a divided octagonal ring shape to be introduced, and coupling grooves 353 and 355 are formed at both ends of the first case 351, and the second At both ends of the key 352, coupling grooves 354 and 356 are formed, respectively.

The first coupling groove 353 and the third coupling groove 354 are connected to each other through the first bolt 357 , and the second coupling groove 355 and the fourth coupling groove 356 are the second bolt 358 . can be connected to each other using

The first case 351 and the second case 352 have been described as an example of a structure connected with bolts between the defective grooves, but they may be connected using various other elements such as screws, nails, adhesives, and fixing clips. .

Here, the configuration of the first coil and the second coil constituting the current transformer 111 is the same as the components described with reference to FIG. 4 or 5 , and thus a description thereof will be omitted.

In one embodiment, the cases 351 and 352 excluding the cut surface of the current transformer 112 to minimize noise that may be generated according to the vibration of the current transformer 112 introduced into the internal space of the cases 351 and 352. may be molded by filling the inner space of the Epoxy.

18 is a diagram illustrating a structure for fixing a current transformer for power according to another embodiment.

Referring to FIG. 18 , the current transformer has a structure that is spaced apart to have a distance D within the first case 351 and the second case 352 with respect to the distribution line 20 . The two cases 351 and 352 may position the power distribution line 20 on the inside.

Here, since the generation of vibration according to the magnetization of the current transformer is the same as that described in FIG. 6 , a description thereof will be omitted.

In the case of the cases 321 and 322 formed in a circular shape as described in FIG. 6 , they may be shaken on the support plate even by a small shaking due to the weight of the current transformer 112 . In the case of the installation structure of the current transformer according to another embodiment, shaking on the support plate may be prevented due to an increase in the contact area between the cases 351 and 352 and the support plate.

19 and 20 are views illustrating an installation structure of a current transformer according to still another embodiment.

19 and 20, it is formed in a divided ring shape corresponding to the size of the inner space of each of the two cases 351 and 352, and heat is transferred from the current transformer 112 introduced into its inner space. It further includes heat dissipation units 361 and 362 through which the current transformer 112 is introduced into the inner space to receive and discharge the heat. Here, the components of the cases 351 and 352 are the same as those of FIG. 16 or 17, and thus description thereof will be omitted.

At this time, the heat dissipation units 361 and 362 are preferably made of aluminum (Al) material, which is generally used as a heat dissipation structure due to high thermal conductivity, and can effectively dissipate the heat transferred to the heat dissipation units 361 and 362. A plurality of heat dissipation blades 363 may be formed to extend outwardly along the outer circumferential surface to increase the heat dissipation area.

The term '~ unit' used in the above embodiments means software or hardware components such as field programmable gate array (FPGA) or ASIC, and '~ unit' performs certain roles. However, '-part' is not limited to software or hardware. '~unit' may be configured to reside on an addressable storage medium or may be configured to refresh one or more processors. Thus, as an example, '~' refers to components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, and procedures. , subroutines, segments of program patent code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables.

Functions provided in components and '~ units' may be combined into a smaller number of components and '~ units' or separated from additional components and '~ units'.

In addition, components and '~ units' may be implemented to play one or more CPUs in a device or secure multimedia card.

The above-described embodiments are for illustration, and those of ordinary skill in the art to which the above-described embodiments pertain can easily transform into other specific forms without changing the technical idea or essential features of the above-described embodiments. you will understand Therefore, it should be understood that the above-described embodiments are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a dispersed form, and likewise components described as distributed may also be implemented in a combined form.

The scope to be protected through this specification is indicated by the claims described below rather than the above detailed description, and should be construed to include all changes or modifications derived from the meaning and scope of the claims and their equivalents. .

10: metrology system 100: power supply
110: current transformer for power supply 111: short circuit switch
112: current transformer 120: power unit
121: protection circuit 122: input current relay unit
123: rectifier circuit 124: maximum voltage limiter
125: current control unit 126: output unit
127: measurement display unit

Claims (8)

A current transformer for power supply for a power supply that converts a primary current flowing in a distribution line into a secondary current through electromagnetic induction, the current transformer comprising:
The current transformer for the power supply,
a current transformer connected to a plurality of terminals based on a constant number of turns to adjust the output current; and
and a short-circuit switch for short-circuiting both ends of the current transformer to prevent a high voltage generated according to the opening of the output terminal of the current transformer;
The current transformer for power is connected to a power supply unit for converting the secondary current into a preset voltage and outputting it,
The power supply unit,
a protection circuit for preventing at least one of an overvoltage and an overcurrent caused by the secondary current output from the power current transformer;
an input current relay unit for controlling a turn ratio of the current transformer for power so that the secondary current within a preset allowable current range is input;
a rectifier circuit for converting the secondary current, which is an AC voltage input by a turn ratio control in the power current transformer, into a DC voltage;
a maximum voltage limiting unit limiting the maximum voltage of the DC voltage to a preset reference voltage or less;
a current controller for controlling an operation of the input current relay unit based on the DC voltage;
an output unit connected to at least one measuring device and outputting the converted DC voltage into a voltage required by the measuring device; and
and a measurement display unit for displaying information about the voltage and current output from the output unit,
The current control unit,
a DC voltage measuring unit for measuring the DC voltage;
a relay unit connecting one of the plurality of terminals based on a predetermined number of turns based on a preset current ratio tap; and
And a relay control unit for controlling to be connected to one of the plurality of terminals based on the DC voltage,
The input current relay unit,
A current transformer for a power supply for reducing a secondary current to less than a preset current by connecting at least some of the terminals connected to have a predetermined turn ratio output from the current transformer for power supply. The method of claim 1,
The current transformer for the power supply,
The current transformer includes two cases having a divided ring shape to be introduced,
One end of each of the two cases is connected in the form of a hinge, and the other end is each formed with a coupling groove that can be coupled through a bolt. The method of claim 1,
The current transformer for the power supply,
The current transformer includes two cases having a divided ring shape to be introduced,
A current transformer for a power supply device in which coupling grooves that can be coupled through bolts are formed at both ends of each of the two cases. The method of claim 1,
The current transformer for the power supply,
a shelf to which the current transformer for power is fixed; and
A current transformer for a power supply device fixed using a structure including a support for supporting the shelf. The method of claim 1,
The current transformer for the power supply,
Wire reel fixed to the ceiling; and
A current transformer for power supply for a power supply device connected to the wire reel and fixed using a structure including wires connected to a hole formed in at least a part of the current transformer for power supply. The method of claim 1,
The current transformer for the power supply,
It includes two cases having a divided octagonal ring shape for the current transformer to be introduced,
At both ends of each of the two cases, coupling grooves that can be coupled through bolts are formed,
A current transformer for a power supply device in which a silicon O-ring is formed to seal the inner space on the surfaces of the two cases facing each other. 7. The method of claim 6,
The two cases are
A current transformer for power supply in which the internal space except for the cut surface of the current transformer is filled with epoxy and molded. 7. The method of claim 6,
The current transformer for the power supply,
It is formed in the form of a divided ring corresponding to the size of the inner space of each of the two cases, and further comprises a heat dissipating unit through which the current transformer is introduced into the inner space to receive and release heat from the current transformer,
The heat dissipation unit, a current transformer for a power supply device for forming a plurality of heat dissipation blades extending outwardly along an outer circumferential surface.

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