KR101592001B1

KR101592001B1 - Voltage distribution lines to the forecasting system

Info

Publication number: KR101592001B1
Application number: KR1020150149388A
Authority: KR
Inventors: 이상언
Original assignee: 김호이앤씨(주)
Priority date: 2015-10-27
Filing date: 2015-10-27
Publication date: 2016-02-05

Abstract

The present invention relates to a voltage forecasting system for a distribution line, and more particularly, it relates to a system for estimating the voltage of a distribution line, and more particularly, Thereby preventing the breakage of the power distribution line or the breakage of the terminal of the power pole.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002]

[0001] The present invention relates to a voltage forecasting system for a distribution line, and more particularly, to a system for analyzing and statistically controlling the operation state of a distribution line to maintain an efficient distribution line. And the tension control of the distribution line is automatically and smoothly induced, thereby preventing the breakage of the distribution line and the terminal damage of the electric pole.

Generally, the power system consists of transmission and distribution, and functions to transfer the power generated by the power plant to the final consumer.

Power systems that supply power to most places today, most homes and institutions, are based on power automation systems.

The power automation system includes an energy management system (EMS) for controlling the supply and transportation of electric power to most customers, a supervisory control and data management system (SCADA) for monitoring and controlling the substation and transmission facilities, Acquisition), and a Distribution Automation System (DAS) for managing the distribution system.

Of these, the distribution automation system is an important component for supplying reliable and high-quality electric power by collecting data from a terminal device installed on a distribution line or controlling the switch.

In particular, it is very important to prevent and deal with the problem caused by the voltage drop by measuring and managing the voltage transmitted along the distribution line.

However, in the related art, the equipment and method for reliably detecting and predicting this are insufficient, and therefore, it is required to be supplemented.

In addition, the distribution line constitutes a working wire so that a plurality of distribution lines reach the customer. In the case of a change in temperature due to a strong wind and a change in tension due to a strong wind, disconnection occurs. In some cases, It also causes problems in the power supply to the consumer (demand).

Korea Patent Registration No. 10-0339121 (May 22, 2002) 'Voltage measurement recording device and method of distribution line' Korea Patent Registration No. 10-0709694 (Apr. 13, 2007) 'System and Method for Predicting Insulation Deterioration in Switchboards' Korean Patent Laid-Open No. 10-2014-0018497 (Feb. 23, 2014) 'Method for predicting wind power generation through prediction of short-term wind speed and method for predicting distribution line voltage using the function'

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above-mentioned problems in the prior art, and it is an object of the present invention to provide an apparatus and a method for controlling an operation of a distribution line, And a voltage predicting system of the distribution line is provided so as to prevent the breakage of the distribution line and the breakage of the terminal of the electric pole.

According to an aspect of the present invention, there is provided a voltage detecting unit for detecting a voltage, which is an electrical signal in a power distribution line, at a predetermined number of times and outputting the voltage as digital data; An instantaneous power failure sensing unit 120 coupled in parallel with the voltage sensing unit 110 to generate a power generation signal through the optical sensor when an instantaneous power failure occurs in the power distribution line; A power supply unit 130 for converting the electrical energy of the distribution line into input electrical power and converting the electrical energy into self electrical energy necessary for operation of the meter and supplying power; And controls the plurality of members included in the measurement device through a program stored in the internal device and controls the voltage detection unit 110 and the instantaneous power failure detection unit 120 to generate an instantaneous power failure A control unit 190 for generating a voltage information recording stop signal; A storage unit 140 for storing an average value of the effective voltage measured by the voltage sensing unit 110 and calculated by the controller 190; A time processor 150 for storing time information related to an operation state of the power distribution line processed by the controller 190; A display unit 160 composed of a liquid crystal display and for outputting information from the control unit; An operation unit 170 configured to input information for operating the voltage measuring and recording apparatus with a distribution line and configured to transmit information stored in the storage unit 140 to the outside and to receive information from outside; 180), comprising:

A tension adjusting unit 700 for tying up and down two adjacent first and second power distribution lines DL1 and DL2 among a plurality of power distribution lines constituting the power distribution line and releasing or winding the first and second power distribution lines DL1 and DL2 according to the tension to maintain a constant tension,

The wire W is wound around the tension adjusting unit 700 and hooked to the first power distribution line DL1 while the upper hook HK1 is fixed to one end of the wire W. The lower hook HK2 Is fixed to the second power distribution line DL2 in a fixed state;

The tension adjusting unit 700 includes a drum 710 having a cylindrical shape filled with the drum 710. A predetermined depth coupling groove 712 is formed on both end faces of the drum 710 and an inner diameter of the coupling groove 712 A flange 740 larger than the radius of the drum 710 is fastened to the fastening groove 712 and the flange 740 is protruded from one side so as to be fastened to the fastening groove 712. [ A pair of spring grooves 720 are formed around the drum 710 such that the drum 710 is symmetrical in the radial direction and a coil spring 730 is embedded in the spring groove 720 One end of the coil spring 730 is fixed to one end of the inner wall of the spring groove 720 and the other end is engaged with a part of the inner diameter of the sleeve 750 fitted to the drum 710, Sleeve insertion grooves 760 having a certain depth in the circumferential direction are formed on the upper side and the lower side of the surface on which the protrusion 742 is protruded, The sleeve insertion groove 760 is formed with a plurality of bearing fixing grooves 762 spaced apart from each other in the circumferential direction. The bearing fixing grooves 762 are formed in the sleeve insertion groove 760, The fixing groove 762 is formed on the upper and lower sides of the sleeve 750 inserted in the width of the sleeve insertion groove 760 and the plate bearing 770 is fixed to the bearing fixing groove 762, And a power supply line for supplying power to the power line.

According to the present invention, it is possible to perform efficient maintenance of the distribution line by analyzing and statistically processing the operation state of the distribution line at certain intervals, and at the same time, automatically adjusting the tension of the distribution line to be smoothly induced, Prevention effect can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram of a distribution line voltage measurement recording apparatus according to a preferred embodiment of the present invention; FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a voltage measuring and recording apparatus,
3 is a configuration diagram of a conversion circuit for converting an AC signal into a DC signal according to a preferred embodiment of the present invention.
4 is a configuration diagram of an analog-to-digital conversion circuit included in a voltage sensing unit according to a preferred embodiment of the present invention;
5 is a flowchart illustrating an operation of a program stored in a controller according to a preferred embodiment of the present invention.
6 is a flowchart for checking whether a momentary power failure occurs according to a preferred embodiment of the present invention.
7 is a flowchart showing an automatic measurement flow according to a preferred embodiment of the present invention.
Figure 8 is a schematic flow diagram illustrating a measurement flow according to a preferred embodiment of the present invention.
9 is an exemplary view showing an example of installation of a tension adjusting unit according to a preferred embodiment of the present invention.
10 is an exemplary cross-sectional view embodying the tension adjustment unit of FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Before describing the present invention, the following specific structural or functional descriptions are merely illustrative for the purpose of describing an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention may be embodied in various forms, And should not be construed as limited to the embodiments described herein.

In addition, since the embodiments according to the concept of the present invention can make various changes and have various forms, specific embodiments are illustrated in the drawings and described in detail herein. However, it should be understood that the embodiments according to the concept of the present invention are not intended to limit the present invention to specific modes of operation, but include all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.

Prior to the detailed description, the present invention implements a voltage forecasting system for a distribution line based on the configuration of a recorder and method of voltage measurement of a distribution line by registered patent No. 10-0339121 (May 22, 2002) And is configured to include an automatic adjustment function.

1 and 2, the present invention includes a voltage sensing unit 110, an instantaneous power failure sensing unit 120, a power supply unit 130, a storage unit 140, a time processing unit 150, a display unit 160, an operation unit 170, a communication connection unit 180, a control unit 190, and the like.

The voltage sensing unit 110 is a means for detecting a voltage, which is an electrical signal in the distribution line, and outputting it as digital data. The voltage sensing unit 110 measures an effective value (for example, 1 second) effective value The voltage value is sampled and measured, and an average value is calculated every predetermined recording period (for example, 1 minute).

2, the voltage sensing unit 110 includes a filter and a signal adjusting unit 111 for removing noise and converting an AC signal into a DC signal, an analog-to-digital converter (A / D) converter 112, and the like will be described in detail with reference to the following drawings.

Effective value The voltage value is the value of the DC voltage and the value of the AC voltage.

The voltage of the alternating current is not constant but varies periodically with time.

Therefore, the alternating voltage and the direct voltage are separately applied with the same resistance, and the intensity of the alternating voltage is represented by the intensity of the direct voltage when the power consumed in the resistance is the same.

In other words, the rms value equals the square root of the mean value over one period of the square of the instantaneous value of the periodically varying voltage.

The instantaneous power failure sensing unit 120 generates a power generation signal through the optical sensor when an instantaneous power failure occurs, and is coupled to the voltage sensing unit 110 in parallel.

The power supply unit 130 converts the electrical energy of the distribution line into an input power supply and converts the electrical energy into self electrical energy necessary for the operation of the meter and supplies the electrical energy to each unit (for example, a component circuit of a control unit, a liquid crystal display ), An RS-232C communication device, an analog-to-digital converter (AD converter), a time processing part, etc.).

The storage unit 140 is a unit for storing the average value of the effective voltage measured and calculated by the voltage sensing unit 110. The stored information includes average voltage information, respective recording times, unique number (ID) Recording period, unique number quantity information, and the like.

The time processing unit 150 is a means for storing time information such as a current time, a start time at the time of a reservation measurement, a measurement end time, a power failure time at the time of occurrence of a power failure, and a plurality of power failure times at the time of power failure recovery.

The display unit 160 includes a liquid crystal display (LCD), and displays numerals, characters, images, and the like using optical characteristics of the liquid crystal that change electrically (reflect light by applying voltage) .

A liquid crystal display (LCD) has no self-luminescence, but has a very low power consumption and a low operating voltage.

The operation unit 170 is constituted by a plurality of buttons and is a means for inputting information for operation of the voltage measurement recording apparatus with the distribution line.

The communication connection unit 180 is a means for transmitting information stored in the storage unit 140 to the outside and may be configured as an RS-232C communication device for communication or in a connection terminal format for direct connection with an external analysis system have.

The control unit 190 is a means for controlling and controlling the plurality of devices through a program stored therein, and can be applied as a microprocessor as a central processing unit.

3 is a configuration diagram of a conversion circuit for converting an AC signal into a DC signal according to a preferred embodiment of the present invention.

The alternating current has different electric characteristics due to its waveform, so it is difficult to express voltage and current like direct current.

The average value defined by the DC voltage corresponding to the time average of the AC waveform area in the case of the sinusoidal AC voltage, the effective value defined by the DC voltage corresponding to the time average of the AC energy of the AC waveform, And the maximum value indicating the maximum amplitude of the signal.

In the distribution line voltage measurement recording apparatus of the present invention, from the measurement of the average voltage using the full-wave rectification circuit, it is converted into the effective voltage.

There is a difference of 1.11072 times between the average voltage and the effective voltage based on sinusoidal ac voltage.

Referring to FIG. 3, the low-voltage AC signal is converted into a DC signal through the adder and the rectifier circuit including the second amplifier OP2 and the negative output inversion diode circuit including the first amplifier OP1 Explain.

In the first amplification unit OP1, which is a first-half output inversion-anomaly diode, a half-period output of -Et is obtained for a half period input of + Ei through a diode in the reverse direction.

The normal input terminal of the second amplifying unit OP2 which is the next inverting amplifier and adder unit is connected to the reference potential (ground), and the output voltage Et of the first amplifying unit OP1 passes through the third resistor R3, (-) input terminal.

Therefore, the (+) input terminal signal of the (-) input terminal is inverted to a negative output voltage, and then the (+) input terminal signal of the (- (Negative feedback).

The magnitude of the output voltage is amplified by the ratio of -R4 / R3 of the Et input voltage, and the polarity is inverted.

That is, in the inverting amplifier circuit portion, an amplified output voltage having an opposite phase to the input voltage is obtained.

Therefore, the effective voltage value can be obtained through the above AC voltage measuring circuit.

4 is a configuration diagram of an analog-digital conversion circuit included in a voltage sensing unit according to a preferred embodiment of the present invention.

Referring again to Fig. 3, analog-to-digital conversion is required for the ac voltage converted to the rms value.

A method capable of processing data in series in order to miniaturize the product size and to improve the countermeasure against noise is applied to the present invention.

4, the analog-to-digital conversion circuit 112 is included in a voltage sensing unit (see FIG. 1) and includes an integrating unit 113, a comparison measuring unit 114, a circuit control unit 115, a switch driving unit 116, A switch unit 117, a reference voltage generating unit 118, and the like.

The analog-to-digital converter circuit 112 has a dual-slope converter function capable of performing serialized data processing.

The external control interface to the analog to digital conversion circuit includes control logic inputs A and B for circuit control and output information of the comparative measurement section 114 and the like.

Under the control of A and B, the conversion circuit performs a four-step data conversion process of auto zero, integrate, deintegrate and integrator zero, The digital conversion process is terminated.

In the Auto Zero phase, the Integrator is initially designed to be zero.

Thereafter, during the period of fixed integration, the input voltage is integrated, and after a period of time, the Deintegrate step is immediately advanced, during which the input to the input terminal of the integrator is applied in the opposite polarity to the input Integration is performed with respect to the reference voltage.

However, the integral value decreases as opposed to the applied voltage polarity.

At the same time, the timer inside the external control starts to operate and the deintegration process proceeds until the integrator becomes zero voltage again.

Also, the polarity of the output information of the comparison measuring unit 114 changes from 'HIGH' to 'LOW', and the operation of the timer in the external control unit also stops.

5 is a flowchart illustrating an operation of a program stored in a controller according to a preferred embodiment of the present invention.

Referring to FIG. 5, in step 210, the control unit is initialized. As a method for initializing the control unit, for example, a method of continuously supplying a reset signal longer than a predetermined period (for example, 300 msec) may be applied.

In step 220, parameters for operation such as timer and counter mode, setting of communication and interrupt registers, and communication speed setting are initialized, and the control unit initial operation value is set.

In step 230, the initial operation state of the meter is displayed. The displayable items include a current time (for example, year, month, day, and hour) by reading a clock value on the liquid crystal display of the meter, (For example, a company logo, etc.), a measurement cycle (for example, a sampling cycle), a unique code information of a measurement point (for example, a four-digit number, etc.) The number of unique code information recorded in the storage unit, and the like can be applied.

In step 240, it is checked whether the measurement mode used at the location of the unique code information of the last measurement point among the data structure of the flash memory is completed. If the measurement mode is being measured, the measurement is started from the current time. The address location of the flash memory is stored in the time processing unit.

In step 240, it is checked whether or not the key input information from the operator is received. The operations that the operator can operate through the key input include selecting the day or month automatic measurement mode, adjusting the time by a specific button (for example, menu button, adjustment button, setting button, etc.) Erase RAM, search for unique code, and set start and end times for automatic measurement.

If there is an operation by the operator through step 240, the measurement operation is performed according to the information changed by the operator. If there is no operation by the operator, the measurement is performed in the same manner as in step 230.

In case of a momentary power failure in step 250, the related information is stored.

That is, when the instantaneous power failure occurs and the power is maintained for a predetermined period (for example, two cycles), the instantaneous power failure time is stored in the flash memory.

When the power source is normal, an electric signal is generated in the instantaneous power failure detecting unit at a predetermined number of times (for example, 60 times per second) at a predetermined time, and is applied to the control unit. If no signal is detected, it is recognized as a power failure.

The case of instantaneous power failure related to step 250 will be described later in detail with reference to FIG.

FIG. 6 is a flowchart for checking whether an instantaneous power failure has occurred according to a preferred embodiment of the present invention.

Referring to FIG. 6, in step 310, a voltage measuring and recording apparatus for a distribution line conducts a voltage measurement operation according to preset conditions.

In step 320, an interruption of the instantaneous power failure sensing unit is checked to determine whether a specific signal is continuously received from the instantaneous power failure detection unit.

If the power is normal, an electric signal is generated in the instantaneous power failure detecting unit at a predetermined number of times (for example, 60 times per second) at a predetermined time, and is applied to the control unit. For example, (For example, powerfail) is incremented by 1, and is recognized as a power failure if the powerfail is more than a certain number of times (for example, powerfail is 4 or more).

If it is determined in step 320 that the power failure is detected, the process proceeds to step 330 where the power failure time is stored in the time processing unit. If the determination result in step 320 is normal, the process proceeds to step 310 to proceed with the measurement operation.

A process of detecting an instantaneous power failure in a distribution line using the plurality of means (hereinafter, the reference numeral is referring to FIG. 1) and storing the information will be described in detail.

Even if an instantaneous power failure occurs in the power distribution line, a capacitance is included in the power supply of the power supply unit 130, so that the power supply is not interrupted instantaneously.

When the instantaneous power failure occurs, the time is recorded in the time processing unit 150 using the capacitance, and the storage unit 140 stops the recording of the measurement information (data), thereby ending the measurement task .

If an attempt is made to detect whether a power failure has occurred in the power distribution line by the voltage detection unit 110, the effective voltage value is calculated and stored even during the power failure, resulting in distortion of the stored calculation value, It gets harder.

Referring to FIG. 1 again, the instantaneous power failure detecting unit 120 is installed, and the instantaneous power failure detecting unit 120 is configured in parallel with the voltage detecting unit 110.

Also, the control unit 190 recognizes the signal transmitted from the instantaneous power failure detection unit 120 prior to the signal transmitted from the voltage sensing unit 110.

The method for detecting a power failure through the instantaneous power failure detecting unit 120 in the control unit 190 is a method of detecting a power failure by a predetermined number of times (for example, 60 seconds) from the instantaneous power failure detecting unit 120 at a predetermined time Lt; / RTI > If a momentary power failure occurs and a pulse signal is not received from the instantaneous power failure detecting unit 120 for a predetermined cycle (for example, 1/30 second), the controller 190 detects instantaneous power failure, And recognizes the current time as the power failure time and stores it in the time processing unit 150. [

7 is a flowchart showing an automatic measurement flow according to a preferred embodiment of the present invention.

Referring to FIG. 7, in the power line voltage measurement recording apparatus for recovering a power failure state including an instantaneous power failure or the like or for initiating a measurement for the first time, a request is made to select whether or not to store the measurement in step 410, . &Lt; / RTI >

If the measurement storage function and the automatic measurement storage function are not selected at the request of the step 410 to the step 420, the voltage display and blinking phenomenon (i.e., flickering phenomenon) occurs on the display unit, Lt; / RTI >

In addition, if the measurement storage function and the automatic measurement storage function are selected by the request of steps 410 to 420, the measured voltage information is stored in the storage unit.

In step 430, the distribution line voltage measurement recording apparatus requests selection of whether or not to perform automatic measurement over time. If the time-based automatic measurement function is selected by the request of step 430, the process proceeds to step 440 to set the same automatic measurement recording date.

Then, in step 450, it is determined whether or not the current time is the measurement time.

The method for checking whether or not the measurement time is in step 450 may be applied to a method for checking whether or not the current time exists between the automatic measurement start time and the automatic measurement end time.

If the current time is between the above-described times, the flow advances to step 460 to start the measurement operation, and the measured voltage information is classified by time and stored in the storage unit.

If the current time does not exist between the automatic measurement start time and the automatic measurement end time as a result of the inspection in step 450, the process proceeds to step 470 and ends the measurement operation.

If the automatic measurement function is not selected in step 430, the process proceeds to step 480 to record the measurement record by date.

In step 480, the measurement date is checked by checking whether the current date is between the automatic measurement start date and the automatic measurement end date.

If the current date is between the above-described dates as a result of the checking in step 480, the process proceeds to step 470 to start daily automatic measurement recording.

If the current date does not exist between the dates mentioned above as a result of the checking in step 480, the process proceeds to step 500 to end the daily automatic measurement recording.

Figure 8 is a schematic flow diagram illustrating a measurement flow according to a preferred embodiment of the present invention.

Fig. 8 shows a schematic flow when starting the power recovery or the initial measurement.

At step 550, the voltage measurement recorder at the distribution line checks whether there is an operator input.

If there is user input (for example, input using various operation buttons such as clock setting, recording period, etc.), the process proceeds to step 560 to display the modification of the user on the display unit, and then proceeds to step 570.

If it is determined in operation 550 that there is no operator input, the process directly proceeds to operation 570.

At step 570 it is checked whether there is a communication input.

The inspection of the communication input is to determine whether it is sending / receiving data to / from the external analysis system using the communication port.

If there is an input on the communication, the flow advances to step 580 to process the data transmission / reception job with the analysis system, and then proceeds to step 590.

If it is determined in step 570 that there is no communication input, the process directly proceeds to step 590.

In step 590, it is checked whether the current time is the time to record the measured value (see FIG. 7).

If it is time to record the measured value, the process proceeds to step 600 to record the measured value and proceeds to step 610. If not, the process proceeds directly to step 610.

In step 610, the distribution line voltage measurement recording device checks whether a current power failure (including instantaneous power failure) has occurred.

If a power failure has not occurred, the process proceeds to step 590 to check whether or not it is time to record the measured value.

If a power failure occurs, the process proceeds to step 620 to end the operation.

Hereinafter, the voltage measurement algorithm will be briefly described.

The value of the analog voltage converted to digital is processed by the result value recorded in the timer counter.

A relation voltage, an input voltage signal, a reference voltage, an integration time, and the like are established as shown in Equation 1 below.

<MARGIN × TR × P> where V _REF <IP> is the reference voltage (eg, 2V), <MARGIN × TR × P> t _INT <IP> is the fixed integration time, MARGIN × TR × P> t _DEINT <IP> is the integral Voltage Integral Time.

In this case, assuming that the input line voltage is constant during a short sampling period, a simple relation is established as shown in Equation (2) below.

Thus, the input voltage can be easily calculated by counting <MARGIN × TR × P> t _DEINT <IP>.

Hereinafter, an algorithm for calculating an input voltage using a microcontroller (AT89C52) will be described.

unsigned char ad_timer;

unsigned int ad_value;

unsigned long SunAD;

// Set whether timer works from signal control and monitoring of A, B, Comparator_Out

interrupt [0X0B] void timer_0 (void)

{

TH0 = -240;

switch (ad_timer) {

case 0: // Auto zero step

A = 0; B = 1; Comparator_OUT = 0;

TF1 = TR1 = TH1 = TL1 = 0; break;

case 4: // Integration step

A = 1; B = 0; break;

case 8: // Deintegration step

B1 = 0; TR1 = 1; break;

case 15: // Integration Output Zero

A = B = Comparator_OUT = 0; break;

}

// Routine that calculates the rms value sampled for the line voltage from the timer / counter of the microcontroller

interrupt [0X03] void EX0_int (void)

{

TR1 = 0;

ad_value = (TH1 * 16 + TL1 / 16) -4;

SumAD + = ad_value

}

9 and 10, the first and second power distribution lines DL1 and DL2 of the upper and lower pairs of the plurality of power distribution lines are connected to each other and are released or wound according to the tension to maintain a constant tension (Not shown).

At this time, the wire W is wound on the tension adjusting unit 700, the first wire (DL1) is hooked to the one end of the wire (W) in a state where the upper hook HK1 is fixed, And is hooked on the second power distribution line DL2 in a state where the second power line HK2 is fixed.

In addition, a length adjuster 800 having the same structure is installed on the wire W adjacent to the upper hook HK1 and the wire W adjacent to the lower hook HK2.

Since the length adjuster 800 can easily adjust the length of the wire W and it is difficult to arbitrarily adjust the length of the wire W when the length adjuster 800 is not provided, 2 Between the power distribution lines (DL1, DL2) may be excessively pulled or loosened.

In order to prevent this, a length adjuster 800 is provided in the present invention.

The length adjuster 800 comprises an upper housing 810 and a lower housing 820 that are hooked and fixed to each other. When the two housings are fitted together, the length adjuster 800 A wire through hole 830 is formed through the upper and lower surfaces.

A first through hole 840, a screw hole 850, and a second through hole 860 are formed in the upper side of the upper housing 810 (with reference to FIG. 9) And the binding hole 870 is screwed to the screw hole 850. [

At this time, the binding port 870 is a rod-shaped member that can be wound on the wire W, and it is preferable that the adjusting knob NB is integrally provided so that it can be easily turned by a finger.

The wire W is wound on the outer circumferential surface of the binding hole 870 which is fastened to the screw hole 850 at least once after coming out of the first through hole 840 after being inserted into the upper wire hole 830, Then enters the second through hole 860 again, and then exits through the wire through hole (not shown).

Then, since the wire W receives strong frictional resistance at the portion wound around the binding hole 870, the wire W is not easily released.

With this structure, the length of the wire W can be easily adjusted.

Meanwhile, the tension adjusting unit 700 includes a drum 710 as shown in FIG.

The drum 710 has a cylindrical shape filled with the inside thereof, and a constant depth coupling groove 712 is formed in both end faces, and a thread is formed in the inside diameter of the coupling groove 712.

A flange 740 larger than the radius of the drum 710 is fastened to the fastening groove 712.

The flange 740 is formed with a fixing portion 742 protruding from one side so as to be fastened to the coupling groove 712.

In addition, a pair of spring grooves 720 are formed around the drum 710 so as to be symmetrical in the radial direction. In FIG. 10, the drum 710 is illustrated as being formed in a depth direction as shown in FIG. 10, And has a groove with a certain depth.

One end of the coil spring 730 is fixed to one end of the inner wall of the spring groove 720 and the other end of the coil spring 730 is connected to a part of the inner diameter of the sleeve 750 to be described later .

Sleeve insertion grooves 760 having a predetermined depth in the circumferential direction are formed on the upper side and the lower side of the surface of the flange 740 on which the fixing portions 742 protrude.

The sleeve insertion groove 760 is a groove for guiding both ends of the sleeve 750 to be inserted and rotated so that the sleeve 750 is inserted into the drum 710.

In particular, the sleeve 750 may have a plurality of wire guide grooves 752 formed in a semicircular shape in a circumferential direction on the surface thereof, preferably formed in a spiral shape, .

Therefore, when the wire W slips, the sleeve 750 also rotates due to the frictional resistance with the surface, and the forward rotation and the reverse rotation occur repeatedly in response to the tension variation.

However, since the sleeve 750 is not rotated excessively by 360 °, but the tension of the first and second power distribution lines DL1 and DL2 is not so large, the sleeve 750 rotates within a small angular range.

A plurality of bearing fixing grooves 762 are formed in the sleeve insertion groove 760 at intervals in the circumferential direction. The bearing fixing grooves 762 are formed in the sleeve inserted in the width of the sleeve insertion groove 760 750, and a plate-like bearing 770 is fixed to the bearing fixing groove 762.

The plate-shaped bearing 770 is assembled such that the upper plate 774 and the lower plate 776 are separated from each other, and then hooked together to form a single body. The plate 778 is inserted and fixed so that the ball 778 is not detached.

Also, a bearing hook 772 is formed so that the tip of the plate-like bearing 770 can be fitted and fixed to the bearing fixing groove 762.

At this time, when the ball 778 is assembled, the ball 778 is inserted while the upper plate 774 and the lower plate 776 are opened. When the two plates are hooked, the ball 778 is inserted into the city 778 Shaped bearing 770 having the same shape.

For this purpose, holes are formed in the upper plate 774 and the lower plate 778 so that the balls 778 can be received, but the reference numerals are omitted in the drawings.

If the external force (mainly, strong wind) acts on one of the first and second power distribution lines DL1 and DL2 and the first and second power distribution lines DL1 and DL2 move away from the other side, the wire W is buffered.

For example, when the first distribution line DL1 tries to move upward, the upper hook HK1 is pulled and the wire W moves upward.

Then, the sleeve 750 around which the wire W is wound slightly rotates in that direction to unwind the wire W, and the lower hook HK2 on the opposite side is also pulled.

At the same time, as the sleeve 750 rotates, one of the two coil springs 730 is tensioned and the other is compressed.

In this process, the external forces applied to the first and second power distribution lines DL1 and DL2 are buffered.

Thereafter, when the external force disappears, the coil spring 730, which has been compressed, tries to be tensioned, and when the tension is restored to its original position, it naturally returns to its original tension.

The tension adjusting unit 700 according to the present invention having such a configuration can be installed and used very easily and conveniently since the installation is completed only by hooking the hooks to the two power distribution lines.

110: voltage detection unit 120: instantaneous power failure detection unit
130: power supply unit 140:
150: time processing unit 160: display unit
170: Operation part 180: Communication connection part
190:

Claims

A voltage detection unit 110 for detecting a predetermined number of times of a voltage, which is an electrical signal in a power distribution line, at predetermined intervals and outputting the detected voltage as digital data; An instantaneous power failure sensing unit 120 coupled in parallel with the voltage sensing unit 110 to generate a power generation signal through the optical sensor when an instantaneous power failure occurs in the power distribution line; A power supply unit 130 for converting the electrical energy of the distribution line into input electrical power and converting the electrical energy into self electrical energy necessary for operation of the meter and supplying power; And controls the plurality of members included in the measurement device through a program stored in the internal device and controls the voltage detection unit 110 and the instantaneous power failure detection unit 120 to generate an instantaneous power failure A control unit 190 for generating a voltage information recording stop signal; A storage unit 140 for storing an average value of the effective voltage measured by the voltage sensing unit 110 and calculated by the controller 190; A time processor 150 for storing time information related to an operation state of the power distribution line processed by the controller 190; A display unit 160 composed of a liquid crystal display and for outputting information from the control unit; An operation unit 170 configured to input information for operating the voltage measuring and recording apparatus with a distribution line and configured to transmit information stored in the storage unit 140 to the outside and to receive information from outside; 180), comprising:
A tension adjusting unit 700 for tying up and down two adjacent first and second power distribution lines DL1 and DL2 among a plurality of power distribution lines constituting the power distribution line and releasing or winding the first and second power distribution lines DL1 and DL2 according to the tension to maintain a constant tension,
The wire W is wound around the tension adjusting unit 700 and hooked to the first power distribution line DL1 while the upper hook HK1 is fixed to one end of the wire W. The lower hook HK2 Is fixed to the second power distribution line DL2 in a fixed state;
The tension adjusting unit 700 includes a drum 710 having a cylindrical shape filled with the drum 710. A predetermined depth coupling groove 712 is formed on both end faces of the drum 710 and an inner diameter of the coupling groove 712 A flange 740 larger than the radius of the drum 710 is fastened to the fastening groove 712 and the flange 740 is protruded from one side so as to be fastened to the fastening groove 712. [ A pair of spring grooves 720 are formed around the drum 710 such that the drum 710 is symmetrical in the radial direction and a coil spring 730 is embedded in the spring groove 720 One end of the coil spring 730 is fixed to one end of the inner wall of the spring groove 720 and the other end is engaged with a part of the inner diameter of the sleeve 750 fitted to the drum 710, Sleeve insertion grooves 760 having a certain depth in the circumferential direction are formed on the upper side and the lower side of the surface on which the protrusion 742 is protruded, The sleeve insertion groove 760 is formed with a plurality of bearing fixing grooves 762 spaced apart from each other in the circumferential direction. The bearing fixing grooves 762 are formed in the sleeve insertion groove 760, The fixing groove 762 is formed on the upper and lower sides of the sleeve 750 inserted in the width of the sleeve insertion groove 760 and the plate bearing 770 is fixed to the bearing fixing groove 762, So as to be rotatable.