KR20060063829A - Test method and device of ratio error test - Google Patents

Abstract

The present invention relates to a current non-error test method and apparatus for a live state transformer, and more particularly, by measuring the primary side current of the extra-high pressure and the secondary side current of low pressure to the transformer being supplied with electricity, while passing through the transformer The present invention relates to a method and apparatus for identifying a failure of a transformer by identifying an error of a secondary current that may occur.

According to the present invention, the primary side current of the high voltage and the secondary side current of the low pressure are measured in a predetermined frequency period unit in a live state in which electricity is supplied, so that the operation can be easily measured whether the deviation is out of tolerance. And the current error test method for live state transformer, characterized in that

A primary detector configured to form a wireless transceiver at an end of an insulation rod, and to form a hook meter that is automatically opened and closed by only pushing and pulling wires at the front end of the wireless transceiver to easily measure a high voltage current and to transmit and receive a control signal from a main body; 3 secondary detectors (R, S, T phase) for receiving wires and converting them into a voltage that can be used in the main body. Power switch, multiple digital switches, multiple command buttons, first and second LED indicators, output terminals, emergency power connector, secondary detector connection terminal are provided, and the data inputted through the primary and secondary detectors are processed and processed. Current rain for live state transformers, characterized in that formed by a combination of; The tester is provided.

Instrument transformers, radios, non-errors, primary high voltage currents, secondary low voltage currents, microprocessors.

Description

Current error test method for live state transformer and its device {Test method and device of ratio error test}

1 is a flow chart showing the overall flow of the present invention.

Figure 2 is a state diagram showing a primary detection unit in the present invention

Figure 3a, 3b is a perspective view of the secondary detection unit and the main body in the present invention

Figure 4 is a state diagram showing the overall connection state of the present invention

Figure 5a, 5b is a block diagram showing the configuration of the primary detection unit and the main body in the present invention

 <Description of the symbols for the main parts of the drawings>

10: primary detection unit 11: insulated rod 12, 21: hook meter

13,34: Wireless transceiver 15,23: Hook 16: Power switch

20: secondary detection unit 22: wired cable 30: main body

31: Digital switch 32: LCD display 33: Command button

35: power switch 36: first LED indicator 36 ': second LED indicator

37: output terminal 38: emergency power connection 39: connection terminal

100: transformer

The present invention relates to a current non-error test method and apparatus for a live state transformer, and more particularly, by measuring the primary side current of the extra-high pressure and the secondary side current of low pressure to the transformer being supplied with electricity, while passing through the transformer The present invention relates to a method and apparatus for identifying a failure of a transformer by identifying an error of a secondary current that may occur.

In general, the metering out fit (MOF) is used to precisely measure low voltage and low current, which is directly proportional to the usage of the electricity meter installed to calculate the electricity charge according to the amount of usage between the user receiving the special voltage and the Korean power supply. It is a combination of a potential transformer (PT) and a current transformer (CT).

Such transformers may have abnormalities in coils or iron cores due to external shocks or passage of overcurrent, thereby causing electric current errors so that the power supplier may collect electricity charges lower than normal rates.

As described above, in order to find a transformer in which a low current ratio error is uttered, the error of the transformer is measured in an oblique state in which power failure is performed or in a live state in which electricity is being supplied. This requires a power outage and other disadvantages such as loss of downtime for electricity users and loss of not selling to suppliers.

As a method of measuring in the live state, there is a method of connecting the ammeter to the primary side and the secondary side, and the inspector directly notes the current value and compares the current value. The problem is that the inspection time becomes longer by measuring several times.

An object of the present invention is to solve such a conventional problem, by measuring the primary side high voltage current and secondary side low voltage current in the same time in the live state, it is possible to minimize the error range of the primary side and secondary side In addition, the object of the present invention is to make it possible to easily determine whether the measurement data transmitted by wire or wireless is out of tolerance.

As a means for achieving the above object, the current non-error test method through the communication status checking step, information input step, current measurement step, transmission step, data storage and output step;

A primary detector formed of a hook meter, a wireless transceiver, and an insulation rod; A secondary detector formed of a hook meter, a wireless transceiver, a wired cable; LCD display, wireless transceiver, power switch, multiple digital switches, multiple command buttons, first and second LED indicators, output terminals, emergency power connection, secondary detector connection terminals It is intended to provide a; current non-error testing apparatus formed by a combination of the main body for calculating the current value.

In general, in the method of measuring the non-error current of the instrument transformer, the primary side current of the extra high voltage and the secondary side current of low pressure in a live state in which electricity is being supplied are measured in a unit of a predetermined frequency period to calculate and synchronize the tolerance. It is characterized in that it can be easily measured whether or not deviation.

In general, the method for measuring the non-error current of the transformer for the instrument, the method comprising: a communication state checking step of confirming the communication connection state between the primary detection unit and the main body after applying power to each unit; An information input step of inputting a numerical value such as a C.T ratio required for measurement and non-error testing through a plurality of digital switches of the main body; Setting a hook meter measurement range of the primary detector and the secondary detector in the live state, and measuring a current connected to one phase of the primary high pressure and the three phases (R, S, T) of the secondary low pressure; A transmission step of transmitting data measured by the primary detection unit wirelessly and data measured by the secondary detection unit to the main body by wire; The main body is characterized by measuring the non-error current through the data storage and output step of storing the three-phase primary side current, secondary side current, the comparison error by the operation synchronization of the transmitted data.

In the above, the current measuring step, the transmitting step, and the data storing step are all performed three times in order to measure all three phases of the primary side high voltage current.

In the normal transformer tester, a wireless transceiver is formed at the tip of an insulated rod, and a hook meter is formed at the tip of the wireless transceiver to automatically open and close only by pushing and pulling an electric wire to easily measure the extra high voltage current and send it from the main body. Primary detection unit that can transmit and receive the control signal; and three (R, S, T phase) to receive the current by a hook meter directly connected to the main body and wired to change the form of voltage that can be used in the main body Secondary detector; and LCD display, wireless transceiver, power switch, multiple digital switches, multiple command buttons, first and second LED indicators, output terminals, emergency power connection, secondary detection connection terminals It is formed of a combination of; main body that acts as the backbone of the transformer error tester to determine whether there is an abnormality by arithmetic processing the data input through the detection unit To a gong.

In the above, a microprocessor is built into the primary detection unit, the secondary detection unit, and the main body.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the technical idea of the present invention.

1 is a flow chart showing the overall flow of the present invention, Figure 2 is a state diagram showing a primary detection unit in the present invention, Figures 3a, 3b is a perspective view showing a secondary detection unit and the body in the present invention, Figure 4 5A and 5B are block diagrams showing the configuration of the primary detection unit and the main body in the present invention.

As shown in FIG. 2, the primary detection unit 10 includes a hook meter 12, a wireless transceiver 13, and the like, in which a power switch 16 is formed on an insulating rod 11 formed of an epoxy glass pipe. On the upper side of the insulated bar 11, a radio transceiver 13 for transmitting data to the main body 30 is mounted. And a hook meter 12 for measuring the current is formed above the radio transceiver 13, and a hook 15 for holding the cable introduced into the transformer 100 is formed at the tip of the hook meter 12. , By forming a hook 15 that is automatically opened and closed only by pushing and pulling force to facilitate high-voltage current measurement.

The secondary detection unit 20 is formed by connecting a wired cable 22 to the hook meter 21 as shown in FIG. 3A, where the secondary detection unit 20 can open and close the hook 23 manually. And, the wired cable 22 is connected to the secondary detection unit connecting terminal 39 of the main body 30 so that the measured data is transmitted by wire.

As shown in FIG. 3B, the main body 30 forms an insertion part 30 ′ for storing the primary and secondary detection parts 10 and 20 to one side, and then the LCD display window 32 and the primary detection part 10. ), A wireless transceiver 34 for wireless communication, a power switch 35 for on / off of power, a first digital switch 31a for setting a current ratio through 3 DIGIT, and a primary detector through 1 DIGIT. A digital switch formed of a second digital switch 31b for setting the measurement range 4A / 40A / 200A of 10), and a third digital switch 31c for setting the determination criteria within the range of 0.0 to 9.9 through 2 DIGIT ( 31), the first command button (33a) for instructing the start of the current measurement of the primary detection unit 10 and the secondary detection unit 20, the second command button (33b) for memo or storing the data is completed, the inspection 3rd command button 33c which completes the procedure and recalls the stored data in order of the latest data. Command button 33 formed by the fourth command button 33d for outputting the data on the screen to the RS-232 port, and the first and second detection units 10 and 20 at the time of lighting indicate that the current is being measured. If an error occurs, the alarm will be alarmed and blinking at the same time, the first LED indicator 36 blinking, indicating that the battery needs to be charged, and the second LED indicator 36 'blinking, and an external mini-printer is connected to output a report or a PC serial. It consists of an output terminal 37 for transmitting a report through the port, an emergency power connector 38 for connecting an emergency power source, and a connection terminal 39 for connecting a secondary detection unit 20.

And the microprocessor is built into each said primary detection part 10 and the main body 30. FIG.

Looking at how to measure the current through the system formed as described above in detail,

First, in the communication state checking step, the primary detection unit 10 and the main body 30 connected to the insulating rod 11 are initialized.

In the information input step, the current ratio is set by the first digital switch 31a, the input range of the primary detection unit 10 is set by the second digital switch 31b, and the judgment criteria are set by the third digital switch 31c. In this case, the current ratio is set to be set, and the input range of the primary detection unit 10 is alternatively set to 4A / 40A / 200A, and the criterion is set within the range of 0.0 to 9.9.

In the current measurement step, the hook 15 of the primary detector 10 hook meter 12 is pushed in the center of the transformer primary lane to connect to the phase of the primary high pressure, and the secondary detector 20 is manually After opening / closing and connecting each of the secondary low voltage three phases (R, S, T phases), press the first command button 33a to command the current measurement to continuously measure the current for a predetermined period of time. The average value of the value is calculated while calculating, and at the same time as the current measurement, the first LED indicator 36 is turned on to indicate the state being measured, and when an error occurs, an alarm sounds and flashes.

At this time, the test can be repeated a plurality of times in a fixed position, or by changing the position (R, S, T) of the primary detection unit 10.

In the transmission step, the data measured after the current measurement step in the primary detection unit 10 and the secondary detection unit 20 of the main body 30 is transmitted to the main body 30, wherein the data measured in the primary detection unit 10 Wirelessly via the wireless transceiver 13, the data measured by the secondary detection unit 20 is transmitted to the wire through the wired cable (22).

In the data storage and output step, the data transmitted from the primary detection unit 10 and the secondary detection unit 20 are arithmetic, and the secondary phase corresponding to the primary side phase is determined based on the measured values. When the phase primary current, secondary current, and comparative error are calculated and displayed on the LCD display window, the second command button 33b is pressed to store the inspection data.

Then, the fourth command button 33d is pressed to connect the stored data, such as the three-phase primary side current, secondary side current, and comparison error, to the output terminal 37 of the main body 30 by connecting the serial port of an external printer or a PC. Output

As described above, the present invention can eliminate the disadvantages between the electric user and the supplier due to the inspection in the oblique state for the accurate inspection as in the prior art, and the problem such as deterioration of precision due to the passive method in the live state Automatic measurement and comparison can minimize the range of error and inspection time and increase precision.

As described above, the present invention measures the primary side high voltage current and the secondary side at the same time in the live state, and transmits the measured data by wire or wireless, and calculates the error between the transmitted primary and secondary current data to determine phase and error. By displaying, eliminating the inconvenience of the electrical user caused by the power outage and the loss of sales due to the power failure of the supplier, it is easy to measure the current error and the measurement cost is low.

Claims (6)

In general, in the method of measuring the non-error current of the instrument transformer, the primary side current of the extra high voltage and the secondary side current of low pressure in a live state in which electricity is being supplied are measured in a unit of a predetermined frequency period to calculate and synchronize the tolerance. A current error test method for a live state transformer, characterized in that it can be easily measured whether or not deviation. In general, the method for measuring the non-error current of the transformer for the instrument, the method comprising: a communication state checking step of confirming the communication connection state between the primary detection unit and the main body after applying power to each unit; An information input step of inputting a numerical value such as a C.T ratio required for measurement and non-error testing through a plurality of digital switches of the main body; Setting a hook meter measurement range of the primary detector and the secondary detector in the live state, and measuring a current connected to one phase of the primary high pressure and the three phases (R, S, T) of the secondary low pressure; A transmission step of transmitting data measured by the primary detection unit wirelessly and data measured by the secondary detection unit to the main body by wire; In the main body, the current error test for live state transformers is characterized by measuring the non-error current through a data output and storage step of storing the three-phase primary current, secondary current, and comparison error by operationally synchronizing the transmitted data. Way. 3. The method of claim 2, wherein the current measuring step, the transmitting step, and the data storing step are performed three times in order to measure all three phases of the primary side high-voltage current. In the normal transformer tester, a wireless transceiver is formed at the tip of an insulated rod, and a hook meter is formed at the tip of the wireless transceiver to automatically open and close only by pushing and pulling an electric wire to easily measure the extra high voltage current and send it from the main body. Primary detection unit that can transmit and receive the control signal; and three (R, S, T phase) to receive the current by a hook meter directly connected to the main body and wired to change the form of voltage that can be used in the main body Secondary detector; and LCD display, wireless transceiver, power switch, multiple digital switches, multiple command buttons, first and second LED indicators, output terminals, emergency power connection, secondary detection connection terminals It is formed of a combination of; main body that acts as the backbone of the transformer error tester to determine whether there is an abnormality by arithmetic processing the data input through the detection unit Current non-error testing machine for hot-line condition transformer for ranging. 5. The current error tester according to claim 4, wherein the primary detection unit and the main body have a microprocessor embedded therein. 5. The current error tester according to claim 4, wherein the primary detector, the secondary detector, and the main body have a microprocessor embedded therein.

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