KR19980039685A - Measuring device and method for load control of column transformer - Google Patents

Abstract

The present invention relates to a measuring device and method for load management of a column transformer, which can measure the correlation coefficient of the load by simultaneously measuring the integrated power amount of the column transformer and the maximum load current and generation time during the integration period. In the related art, the correlation coefficient of the load was predicted by multiplying the seasonal usage by a certain period of time by computerization, and the correlation coefficient was applied without classification by region, season and load characteristics.

Therefore, in order to solve the above problems, the present invention obtains the electric signal magnitudes of current, voltage, and temperature by using a current detecting sensor, a voltage detecting sensor, a temperature detecting sensor, and a communication cable in a column transformer. After converting to data, it calculates and stores the accumulated power amount and the maximum load current and generation time at the same time at regular intervals, and accumulates and measures the number of times when the upper and lower limits deviate. Back-up is used to determine and manage the capacity of the column transformer.

Description

Measuring device and method for load control of column transformer

The present invention relates to a measuring device and method for load management of a column transformer, which can measure the correlation coefficient of the load by simultaneously measuring the integrated power amount of the column transformer and the maximum load current and generation time during the integration period.

Conventionally, the maximum load current is predicted by multiplying the correlation coefficient of the load by the season for a certain period of time by computerization, rather than by the actual measurement. Actually, it is very difficult because it requires a lot of manpower and cost to measure the maximum load current. Was lying on.

The correlation coefficient calculation method is not classified by region, season, and load characteristics, and the load consumption measurement method is also incorrect.

That is, the phenomena are not divided by region and season ② do not consider various load characteristics, ③ can not measure integrated power and maximum current during integration period ④ when calculating AC power after measuring integrated power and maximum load Hardware methods such as analog multiplication semiconductor use method, time division method and diode matrix method were used.

In addition, there is a problem in reliability because there is no memory and operation function for a certain period of time.

However, these problems are not always necessary when calculating the maximum load and depend on the load configuration type, load characteristics, and load conditions during measurement.

For example, it is possible to consider only ③ without considering ① and ②, and consider ① only without considering ②, ③, and ④.

Therefore, when analyzing the cause of the accident, considering it as an overload accident, it can be classified by overload type, overload condition, and surrounding conditions of the overload system. Therefore, it is necessary to acquire data by region, season, and load characteristics in order to establish optimal correlation coefficient and load management plan from these uncertainties.

Therefore, according to the present invention, it is possible to predict the overload by measuring the correlation coefficient of the load by simultaneously measuring the integrated power amount of the column transformer and the maximum load current and generation period during the integration period, thereby resulting in burnout of the column transformer. It is an object of the present invention to provide a measuring device and method for load control of a column transformer that can improve the power supply reliability while preventing the damage.

In order to achieve the above object, a measuring device configured for data collection and processing is configured to be measured in a column transformer, and data is periodically backed up from the measuring device to a PC such as a notebook computer. As the loaded data is input to a certain load discrimination program and the program is executed, information on the load of the column transformer is output as statistical data, graphs, and results, and the capacity calculation or replacement of the actual column transformer and safety facility security, etc. There are many things you can do.

When explaining the features of the present invention, the load control measurement device for columnar transformers capable of measuring the correlation coefficient of the load, converts the electrical signal magnitude and change information into a digital signal, stores it and delivers it to a notebook (Note Book) PC It is a 1st characteristic to consist of means.

In addition, the second aspect of the present invention is to calculate the AC effective value of the voltage, current, power, etc. by calculating the software method by a computer program rather than the analog hardware signal processing method, It has high speed and excellent computing power in a wide range, high reliability of measurement results, small size, low cost, and various functions.

The third feature of the present invention is the use of a high-speed, high-accuracy A / D converter of 8-channel 12-bits for digitalizing the analog AC signal of voltage and current, and displays measurement data. By using 16 characters x 4 lines of LCD module, many measurement data can be displayed at the same time and various measurement data can be displayed by adopting Page Up / Down function.

In addition, when calculating the load correlation coefficient of the column transformer, which is the fourth characteristic, the maximum load current value and the time of occurrence are stored in units of month, day, hour, and minute at the time of calculating the maximum load current. It can help to stabilize the distribution voltage and load management work because it can store the line voltage trend data for up to 6 months and read it through PC through communication.

In other words, in the present invention, since the accuracy cannot be expected in a simple instantaneous value (maximum value of the average value of the current measured for 5 minutes) of the maximum current acquired for calculating the correlation coefficient in the prior art, not only the integrated power amount and the maximum load current, but also the voltage, The transformer enclosure temperature, standby temperature, apparent power, reactive power, active power, and power factor are used as inputs.

In addition, according to the present invention, it is possible to store the trend data for up to 6 months according to the setting of D / I (Demand Interver) in order to obtain the need for data reliability and verification.

1 is a block diagram of a measurement device for load control of the columnar transformer according to the present invention.

Figure 2 is a control block diagram of the measuring device for columnar transformer load management according to the present invention.

3 is a block diagram of a current sensing unit of the present invention.

4 is a block diagram of a voltage sensing unit of the present invention.

5 is a block diagram of a temperature sensing unit of the present invention.

Figure 6 is a circuit diagram showing an example of the current, voltage, temperature sensing unit and power supply unit according to the present invention.

7 is a schematic diagram of a measuring device for columnar transformer load management according to the present invention.

Explanation of symbols for main parts of the drawings

100: control unit 110: CPU

111: upper and lower limit setting unit 112: timer

113: arithmetic processing unit 114: maximum / minimum detection unit

115: comparison and counter 200: current detection unit

210: dummy resistor 220: current level adjustment unit

230: filter and current amplifier 240, 340: A / D converter

300: voltage detection unit 310: internal PT

320: voltage level adjusting unit 330: filter and phase adjusting unit

400: temperature sensor 410: temperature sensor

420: zero point adjustment circuit 430: conversion amplification degree adjustment circuit

440: CPU built-in A / D conversion unit 500: control panel

600: display unit 700: memory

800: communication connection 900: power supply

910: 220 / 110V automatic switching unit

Hereinafter, described in detail with reference to the accompanying drawings of the present invention.

1 is a block diagram of a columnar transformer load management measuring apparatus according to an embodiment of the present invention, as shown in FIG. 1, a current and voltage sensing unit 200 and 300 for detecting current and voltage from a columnar transformer and outputting them as digital data. And a temperature sensing unit 400 for detecting an enclosure and atmospheric temperature of the columnar transformer, and calculating current and voltage data of the current and voltage sensing units 200 and 300 to obtain an effective voltage, current and power, Detects the maximum value, the minimum value, the occurrence time, the upper limit exceeded, the lower limit lowered, and the trend data for each time unit to control the storage, and displays the current temperature based on the temperature of the temperature detector 400 and the maximum temperature. And a control unit 100 for storing and controlling the generation time, controlling the operation of the entire measuring apparatus, a data storage memory 60 for storing each of the data output from the control unit 100, and the control unit 100. ) The display unit 600 for displaying the effective value and temperature of the current, voltage and the operation state under the control of the control unit and for transmitting the data stored in the memory 60 under the control of the control unit 100 to the outside. A communication connection unit 800, an operation unit 500 for inputting a read operation of stored data, a detection period of the maximum minimum value and other operation signals to the control means, and a secondary output power supply of a columnar transformer as input power. It is composed of a power supply unit 900 for converting the operation potential of the respective parts to supply the operating power.

FIG. 2 is a detailed block diagram of a control unit of a columnar transformer load management measuring apparatus according to the present invention. As shown in FIG. 2, a value obtained by collecting 10 times of sampling frequency of an AC signal of measured current and voltage is calculated every second. Full scale proportional calculation, arithmetic processing unit 113 for controlling display by correspondence 1: 1 after decimal and decimal point processing, and current and voltage input during a predetermined demand time limit (D / I). Comparison between counting the number of times that the average value during each time limit deviates from the predetermined upper / lower limit value with the maximum / minimum detection unit 114 that averages the data, detects the maximum value, the minimum value, and the time of occurrence thereof, and stores and controls them. And a counter 115, a time limit for generating the maximum and minimum values, a timer 112 for real-time processing of each calculation, and a means for receiving an A / D conversion of the temperature value of the temperature sensor 400. Including each Central processing unit (CPU) 110 that controls the negative operation control, data storage and output control, the upper and lower limit setting and demand time limit setting according to the key input of the operation unit 500, and the data output through the communication connection unit 800 And an upper / lower limit value setting unit 111 for setting a current that can be changed and set by the control of the operation unit 500 and an upper / lower limit value of the voltage.

3 is a block diagram of a current sensing unit according to the present invention, and as shown therein, a current transformer CT for detecting current, a dummy resistor 210 which is a secondary side resistance of the current transformer CT, and And a current level adjusting unit 220 for adjusting the display voltage of the detected current output through the dummy resistor 210 to match the actual bus-phase secondary bus current, and the output signal of the current level adjusting unit 220. A filter and current amplifier 230 for amplifying and filtering at a level, and an A / D converter 240 for converting the analog output signal of the filter and current amplifier 230 into digital data.

4 is a detailed block diagram of the voltage sensing unit according to the present invention. As shown in FIG. 4, a PT 310 for detecting a voltage and a voltage level adjusting unit 320 for adjusting an actual line voltage and a display voltage to be matched. And a filter and phase adjusting unit 330 for correcting and filtering the phase difference due to the phase difference between the secondary side phase of the PT and the voltage input signal, and the sampling time difference during digital conversion to be processed later. A / D converter 340 for converting the analog output signal of the 330 into a digital signal.

5 is a block diagram of a temperature sensing unit according to the present invention, as shown therein, a temperature sensor 410 for respectively detecting an enclosure and an atmospheric temperature of a columnar transformer, and a zero for adjusting zero points of the temperature sensor 410. A point amplification circuit 420, a conversion amplification degree adjustment circuit 430 for adjusting the sensed temperature of the temperature sensor 410 and the display temperature to match, and a conversion amplification built into the CPU 110 in the controller 100. And a CPU built-in A / D converter (440 = 110) for converting the analog output signal of the adjustment circuit 430 into digital data.

On the other hand, Figure 6 is a circuit diagram showing an embodiment of the current sensing unit 200, the voltage sensing unit 300, the temperature sensing unit 400, the power supply unit 900 according to the invention, which is the current sensing unit 200 is r There are two current sensing circuits for sensing the t-phase current, and the voltage sensing unit 300 also has two voltage sensing circuits for sensing the r and t-phase voltages. The current sensing unit and the voltage sensing unit have one chip. Use common A / D converter with In addition, the power supply unit 900 includes a voltage switching unit 910 for automatically switching input power to 220 / 110V according to the voltage sensed by the voltage sensing unit 300.

Figure 7 is a schematic diagram showing the appearance of the columnar transformer load management measuring device according to the present invention, the display unit 600 for displaying the maximum current, voltage generation time, current, voltage value, power, etc. as shown therein The display device includes upper and lower limit values, a demand due date (D / I), data keys, and operation keys 500 for various operations such as screen control.

Referring to the operation and effect according to the embodiment of the present invention configured as described above are as follows.

First, the current detection sensor needed for current detection when detecting current signal input is clamp type hook type, so it is installed on the secondary side of the main transformer. In the case of single-phase 2-wire, only the sensor connected to the red lead is used. In the wire-type transformer, the sensor connected to red and yellow uses the same color as the voltage-applying line, and it is installed on the secondary cut line so that it is firmly fixed with a tie band to prevent it from flowing down. It is connected to the controller through the A / D converter after passing the current level adjusting unit to match the transformer secondary bus current and the display potential.

Next, the voltage detecting sensor for detecting the voltage signal input is connected to the secondary side bus of the column transformer to input the voltage signal. The program has been developed to operate up to single-phase and three-phase four-wire systems. However, in order to simplify installation and operation in the field and to make it easier for non-experts to use, voltage lead-out cables can be used only for single-phase two-wire and single-phase three-wire systems. It is a device with insulation clamp attached at the end and it is connected to communication line through A / D converter after adjusting voltage level.

The insulation clamp is inserted between the insulation clamps without being stripped of the insulation wire used in the secondary side of the column transformer, and the bolt is inserted and the built-in precipitation electrode penetrates the insulation wire and the voltage is applied.

When measuring the load power of a single-phase three-wire main transformer, the black lead is connected to the grounded common line, the yellow and red leads are connected to both voltage lines, and only black and red leads are used for single-phase two-wire transformers.

Enclosure temperature sensor that measures the input of the enclosure temperature signal is a device that makes it easy to attach the permanent magnet to the location where the temperature is to be measured.It is connected to the communication line through the zero point adjustment circuit and the CPU built-in A / D converter. It is supposed to be.

In this case, to facilitate the transfer of temperature, it is good to clean and install the foreign matter attached to the enclosure.

The communication connection part is for backing up the data acquired from the device to the notebook PC. A cable with two communication lines is drawn out about 2m above the ground, and a connector with a lid is attached at the end to connect the PC communication line. It should be tightly tied to the pole to prevent the cable from shaking in the wind.

As described above, in the present invention, the input of the load management measuring device is first processed through an op amp and an analog peripheral circuit so that the A / D converter is suitable for converting to digital, and then is input to the A / D converter circuit. Four types of sensors are connected: detection sensors, voltage detection sensors, enclosure temperature measurement sensors and data cables for data back-up.

The following describes the processing of the analog current input signal acquired from the column transformer.

That is, two current input circuits of a phase (= r phase) and b phase (= t phase) are built in the load management measuring device, and the lead wire connection terminal of the clamp type current transformer (CT) is connected at the input terminal. When two CTs are used for one CT or two CTs are used in one measuring instrument, one line is used in common, and three terminals are provided.

The dummy resistor 210 is a secondary negative resistance of the clamp CT, and the measurement result is directly affected by the precision of the dummy resistor 210. In the present invention, the self-power consumption as a precision resistance within 2.2%, 1 / 4W metal film type error 1% is calculated as follows.

When the clamped CT primary is 600A, the secondary of the clamped CT is wound at 2000Turn.

Secondary current = 600 A / 2000 (T) = 3000 mA

Resistance power consumption = I ² r = 0.3 × 0.3 × 2.2 = 0.198W

The current level adjusting unit 220 adjusts the actual columnar transformer secondary bus current and the display potential to match the 10-Turn volume, and the filter and current amplifier 230 adjusts the dummy resistor 210 to reduce the secondary burden of the clamp CT. When the signal is lowered to 2.2Ω, the signal output level is low as several hundred mV. Therefore, the amplifier is used as an amplifier and a filter circuit.

The A / D converter 240 is implemented in one IC of the A / D converter of the voltage detector 300, but will be described below with different reference numbers. Since the peak value of the input voltage applied to the input pin of this IC should be maintained at 5V, amplifying the IC pin input voltage in full scale display as 5 / √2 = 3.536V The amplification degree of the circuit

Primary: 500A

Secondary Side Current = 500A / 2000 (T) = 0.25 (A)

Voltage across dummy resistor = 0.25 × 2.2Ω = 0.55V

3.536V / 0.55V = 6.43 times amplification.

Next, in the parameter calculation formula, the effective value calculation of the AC input signal will be explained. Sampling and integration calculations form a waveform of an external power supply frequency to form a 60-second operation time base, and then apply a voltage every cycle. The signal 3 channel and the current signal 3 channel are inputted to the A / D converter 10 times, respectively, and weighted according to each input code.

As described above, the integral calculation value sampled 600 times per second for each input of voltage and current is converted into a floating point calculation value again.

In the square root operation of the integrated value, the square root operation is performed on each of the six channel inputs by calculating the floating point by integrating every second.

The square root calculation value described above is an AC effective value calculation value for the instantaneous binary code converted by the A / D converter 240.

Looking at the calculation formula of the effective current display value, the process includes the correction of the conversion code of the A / D conversion unit 240 so that the actual and the display values correspond to 1: 1 easily so that the measured AC signal signal operation value can be easily understood. Displays through the process of current full scale correction, decimal point cleanup, etc. set by Dip Switch.

The correction of the A / D conversion code is that the A / D conversion unit 240 is 12 bits (Bit) and the conversion reference voltage is set to 5.00 V so that 5/2 ^12-1 = 5/2047.

The correction of the current full scale It is a correction that displays from 5Å to 6000Å according to the setting of Dip Switch according to the installation site. The current input is a high current input, so there is a 30% margin and the full scale is set. According to the setting table, the decimal point is arranged so that 4 significant digits are displayed.

In summary, the above process

In the current input signal processing, the AC signal is directly input to the A / D converter 240 without DC rectification and smoothing. The 12-bit A / D converter 240 inputs an analog signal into a 12-bit binary code and inputs it to the CPU.

In the current calculation, the input signal sampling takes about 10 times at every frequency and then calculates about 600 sampling data for one second. Full scale processing, decimal display, and sampling data are applied to the CT primary rated current. Accordingly, after the proportional calculation, the sampled value is displayed on the LCD display unit 600 every second after the decimal and decimal point calculations.

In addition, the maximum current and the generation time are averaged during the demand interval (D / I) separately set by the key operation of the operation unit 500, and the current current, which is sampled 600 times per second, is displayed. do. That is, the A / D conversion is controlled by the COU 110, display control is performed, and the upper and lower limits set by the operation unit 500 are stored in the setting unit 111, and the arithmetic processing unit 113 is executed. The maximum / minimum value is detected by the maximum / minimum detection unit 114 at every D / I cycle based on the calculation through the operation, and stored in the memory 700 together with the occurrence time, and the upper and lower limit values are compared with the counter 115. Cumulative count of times out of time.

Here, the D / I is selected from four types of 5 minutes, 10 minutes, 15 minutes, and 30 minutes, and the starting point of the D / I is started at a constant time every hour by the internal clock function.

5 minutes D / I: 12 minutes every hour 5 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes, 30 minutes, 35 minutes, 40 minutes, 45 minutes, 50 minutes, 55 minutes

10 minutes D / I: 6 times per hour for 10 minutes, 20 minutes, 30 minutes, 40 minutes and 50 minutes

15 minutes D / I: 4 times per hour for 15 minutes, 30 minutes, 45 minutes and 50 minutes

30 minutes D / I: 30 minutes per hour, twice an hour

Therefore, when AC power-on or data zero reset key is input, the maximum current value is not calculated until the first D / I starts.

The maximum value is displayed after the data 0 reset key has been entered. The maximum value is displayed in months, days, hours, and minutes. The time of occurrence is also displayed after the data 0 reset key has been entered. .

The current detecting sensor used here is a clamp type CT with an inner diameter of 32 mm, the number of turns on the secondary side is 2000 times, and the current measurement range is 0-600A. The voltage was amplified by an op amp to operate.

On the other hand, the voltage input signal processing procedure acquired from the column-phase transformer is a standard applied to single-phase two-wire and single-phase three-wire types. _r )-Com-Vb (= V _t ) The two-voltage input is provided with three terminals.

The internal PT 310 is a kind of transformer formed of a primary 220V, a secondary 6V, and a 22 mm core, and a phase internal PT secondary is also used for power supply voltage determination. In order to protect the internal circuits from surges coming from the secondary line of the column transformer, the surge suppressor “TNR” is attached to each phase input.

In the case of three-phase, an error is caused by the phase difference between the lines according to the direction of insertion into the clamp type PT line. Therefore, a direction change switch (S / W) is attached to the voltage input circuit for easy correction.

The voltage level adjusting unit 320 is adjusted so that the actual line voltage and the display voltage coincide with the 10Turn volume.

The filter and phase adjuster 330 has an error on the actual load power factor due to the phase difference between the secondary side signal and the voltage input signal of the clamp CT and the time difference between sampling the AC signal from the A / D converter 340 and the CPU 110. Is generated and its correction is necessary. It is calibrated using an op amp and doubles as a filter circuit.

The A / D converter 340 receives input pins 1 and 3 of the 8-channel, 12-bit A / D converter. The input signal of the A / D converter 340 is input as it is, without being rectified in + and − bidirectional directions, and the peak-to-peak level is limited to ± 5V. If more than overvoltage is input, a 1kΩ resistor is inserted in series at the IC input terminal for protection.

The calculation process of the various parameter effective value voltage display values is the same as that of the current display value processing except that the margin for the voltage F / S is 20%.

The processing of the voltage input signal 140 is generally similar to the processing of the current input signal 130, and includes a current voltage, a maximum voltage and its occurrence time, an upper limit exceeded, a lower limit lowered, and trend data storage. The current voltage is calculated in the same way as the current, and the sampled values are collected at each frequency about 10 times, and displayed after the full scale proportional calculation, decimal, and decimal point processing after the effective value calculation every second.

The maximum voltage and its occurrence time are stored in the same way as the current, and the maximum value of the average voltage during the D / I period set by the key operation is also stored, and the occurrence time is also stored in units of months, days, hours, and minutes.

The minimum voltage and its occurrence time are stored in the same way as the calculation of the maximum voltage, and the minimum value of the average voltage during the D / I period is memorized, and the occurrence time is stored in units of months, days, hours, and minutes.

The upper limit exceeded is set to the upper limit of input voltage arbitrarily by key operation and counted the number of exceeded when the average voltage during D / I exceeds the upper limit. It is effective when used for Tap Change.

The number of times below the lower limit is a function of arbitrarily setting the lower limit of the input voltage by key operation, and counting the number of times when the average voltage during the D / I is less than the lower limit.

Trend Data memory is a function for smooth operation of distribution voltage of secondary side of columnar transformer by graphing trend of line voltage on the CRT screen of PC. It is a function that stores the I average voltage. Since the number of sampling is set to 8640 times for one input, the memorized period varies depending on the D / I setting.

5 minutes: 30 days (1 month)

10 minutes: 60 days (2 months)

15 minutes: 90 days (3 months)

30 minutes: 180 days (6 months)

Therefore, it is possible to store up to 6 months of trend data, and the trend data has many contents, which cannot be checked on the main body of the device, and can only be checked through a PC.

When the sampling period of the 8640 is exceeded, the latest data is always stored by pushing the memory first.

In addition, since the secondary voltage of the column transformer is 110V or 220V, the voltage detection sensor can be used as a double.

The column transformer load manager has three wires for voltage input, so the single-phase three-wire system uses red, white, and black (common line), but the single-phase two-wire system uses only red and black.

The voltage signal input from the voltage clip is input to the internal voltage signal processing analog circuit which is stepped down to 6V from the internal small transformer 28mm.

In the temperature sensing circuit, terminals for connecting two temperature detection sensors are installed to measure the air temperature and the temperature of the transformer enclosure.

The sensor for temperature detection used the semiconductor IC. Two transformer enclosures and two sensors for measuring the temperature are installed at the 2Pin terminals, and the terminals are + and-polar. The present invention is a sensor for measuring the temperature of the air in the enclosure case, the sensor for measuring the transformer enclosure temperature on the lead wire. It is supposed to connect.

The zero point adjustment circuit 420 is a circuit configured to display an actual temperature at 0 ° C. by using an OP amplifier, and the conversion amplification adjustment circuit 430 is configured by using an OP Amp so that the sensor detection temperature and the display temperature match. It is a signal amplification circuit.

Unlike the voltage and current signals, the CPU built-in A / D converter 440 does not need to sample hundreds of times a high speed per second, unlike the voltage and current signals, and thus inputs the temperature to the built-in A / D converter of the H8 / 534 CPU. Measure

In the temperature display calculation parameter

Transformer enclosure; An 0, outside air (atmosphere); An 1

range ; -40 to + 160 ° C, 0.2 ° C / Deg

In one case, the temperature detection A / D converter 440 is a 10Bit A / D converter built in the CPU 110 and has a full scale and a reference voltage of 5.00V. Therefore, the 0-5V analog signal of the temperature sensing circuit 800 is input to the 10Bit A / D converter 440 and converted into a binary code of 0-1023.

If code is less than 200, display temperature is less than 0 ℃ = (200 conversion -Code) x 0.2

If the code is more than 200, the display temperature is 0 ℃ or less, and the display temperature = (Conversion Code-200) × 0.2.In the temperature input signal processing, the current temperature is measured every second for two kinds of air temperature, atmospheric temperature and case of columnar transformer case. The maximum temperature and the time of occurrence are indicated by the column temperature transformer case temperature and the maximum value of the average temperature during D / I and the time of occurrence are displayed in month, day, hour, minute.

In addition, the sensor for temperature detection used the "analog device" as a semiconductor.

The analog device is easy to use because the temperature error is trimmed inside the IC. The current output is 1uA per 1K of absolute temperature. It is 273uA at 0 ℃ and 373uA at 100 ℃.

The transformer case temperature and air temperature are measured, and the air temperature is measured inside the outer case. Therefore, only the sensor for measuring the temperature of the transformer enclosure is drawn outside.

In the column transformer load manager hardware, the collected and processed results are transferred to the PC through communication every six months.

In order to calculate the correlation coefficient of the column transformer, the present invention as described above does not measure the maximum load current, but calculates the amount of use for each period and multiplies the correlation coefficient of the load by the season by computerization, rather than the integrated power amount and integration. By measuring the maximum load current and the generation time over a period of time and developing the correlation coefficient of the load, a reliable measuring device can be implemented.

In addition, active power, reactive power, apparent power, power factor, and outside temperature can be immediately known for comprehensive management of the column transformer, and the load calculation correlation coefficient can be corrected according to the analysis of the actual column overload accident. It is possible to implement a load measuring device for calculating the correlation coefficient that adds to.

Claims (9)

Current and voltage sensing means for detecting current and voltage from the columnar transformer and outputting it as digital data, temperature sensing means for sensing the enclosure and atmospheric temperature of the columnar transformer, and calculating current and voltage data of the current and voltage sensing means. It calculates the effective value voltage, current and power, and detects and stores the maximum value, minimum value, occurrence time, upper limit exceeded, lower limit lowered, trend data, etc. for each predetermined time unit, and based on the temperature of the temperature sensing means. Control means for displaying the temperature and storing and controlling the maximum temperature and the time of occurrence thereof, controlling the operation of the entire measuring apparatus, data storage means for storing each of the data output from the control means, and the control means. Display means for displaying the current value, the effective value of the voltage and the temperature, and the operation state under the control of the control means; Communication connection means for transmitting the data stored in the storage means to the outside under control of the control means; reading operation of the stored data; Measuring device for load control of the column transformer, characterized in that the power supply means for receiving the secondary output power of the column transformer as an input power supply to convert to match the operating potential of the respective parts to supply the operating power. The apparatus of claim 1, wherein the current sensing means and the voltage sensing means are provided with a sensing circuit so as to sense current and voltage of each of two phases in a three-phase two-wire power source. . According to claim 1, wherein the temperature sensing means is provided with two sensing circuits for inputting the sensing signal of the temperature sensor and two temperature sensors for measuring the enclosure temperature and the atmospheric temperature of the columnar transformer, respectively, to the control means. Columnar transformer load management measuring device, characterized in that. The secondary current bus according to claim 1, wherein the current sensing means comprises: a current transformer for detecting current, a dummy resistor which is a secondary negative resistance of the current transformer, and an actual columnar transformer of the detection current output through the dummy resistor. A digital current level control unit for adjusting the current and the display potential to match, amplifying the output signal of the current level control unit to a predetermined level and filtering the filter and the current amplifier unit, and the analog output signal of the filter and the current amplifier unit. Measuring device for load management of columnar transformer, characterized in that the A / D conversion unit for converting into data. The voltage sensing means according to claim 1, wherein the voltage sensing means includes: a PT for detecting a voltage, a voltage level adjusting unit for adjusting an actual line voltage and a display voltage, a phase difference between a secondary side phase of the PT, and a voltage input signal; A filter and a phase adjusting unit for filtering the phase difference caused by the sampling time difference and the like during the digital conversion to be processed later, and converting the analog output signal of the filter and the phase adjusting unit into a digital signal, are configured as an A / D converter. Measuring device for load control of columnar transformer. According to claim 1, wherein the temperature sensing means, a temperature sensor for sensing the enclosure and the atmospheric temperature of the columnar transformer, a zero point adjustment circuit for adjusting the zero point of the temperature sensor, the sensing temperature and the display temperature of the temperature sensor A column-type transformer comprising: a conversion amplification adjustment circuit for adjusting to match the same; and a CPU built-in A / D converter built in the CPU in the control means and converting the analog output signal of the conversion amplification adjustment circuit into digital data. Measurement device for load management. The method of claim 1, wherein the control unit collects a value obtained by sampling the AC signal of the measured current and the voltage 10 times every frequency, and calculates the effective value every second, and after full scale proportional calculation, decimal, and decimal point processing Arithmetic processing means for displaying control in correspondence with a 1: 1 and a maximum / minimum detection means for detecting and storing the maximum value, minimum value, and occurrence time of these values by averaging during a predetermined demand time period (D / I). Comparison and counting means for counting the number of times the average value during each demand time period deviates from a predetermined upper / lower limit value, a time limit for generating the demand time limit, the maximum minimum value generation time, and a timer for real-time processing of each operation, and the temperature Means for receiving input by converting the temperature value of the sensing means by A / D conversion, and control of operation and storage of data and output of each part, setting upper and lower limits and demand time limits according to key input of the operation part Pole transformer load control device for measurement, characterized in that configured by a control unit for controlling the data output through the communication connecting means. Measuring the current, voltage, and temperature of the column transformer; displaying current values of the effective value and temperature of the current and voltage; and each maximum and minimum value of the current, voltage, and temperature within a certain period and the time of occurrence thereof. Storing an average value of the current, voltage, and temperature during the predetermined period, accumulating a number of times when the average value is greater than or equal to a predetermined upper limit or lower than a lower limit; When the occurrence time, the upper and lower limit number of times data is backed up to a PC at regular intervals to perform the step of performing the analysis process for the load of the column transformer, characterized in that the step of performing a load transformer measurement method. 10. The method of claim 8, wherein the present temperature is displayed every second for two types of atmospheric temperature and the case of the column transformer case, and the maximum value of the average temperature during the D / I is represented by the case of the column transformer case. Measurement method for the column transformer load management, characterized in that displayed in the unit of month, day, hour, minute, and received the A / D conversion by adjusting the detection value of the temperature sensor 0 point and the conversion amplification.