KR20170009361A - Protecting apparatus of test object during short-time withstand current test - Google Patents

Protecting apparatus of test object during short-time withstand current test Download PDF

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Publication number
KR20170009361A
KR20170009361A KR1020150101240A KR20150101240A KR20170009361A KR 20170009361 A KR20170009361 A KR 20170009361A KR 1020150101240 A KR1020150101240 A KR 1020150101240A KR 20150101240 A KR20150101240 A KR 20150101240A KR 20170009361 A KR20170009361 A KR 20170009361A
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South Korea
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value
current
test
sample
voltage
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KR1020150101240A
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Korean (ko)
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이희철
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엘에스산전 주식회사
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Publication of KR20170009361A publication Critical patent/KR20170009361A/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/083—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for three-phase systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/333—Testing of the switching capacity of high-voltage circuit-breakers ; Testing of breaking capacity or related variables, e.g. post arc current or transient recovery voltage
    • G01R31/3333—Apparatus, systems or circuits therefor

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  • General Physics & Mathematics (AREA)
  • Testing Relating To Insulation (AREA)

Abstract

The present invention minimizes the damage to the sample by shortening the application of the test current in the event of a failure of the test in real time by detecting the internal electric power of the sample in real time during the short-time withstand current test, thereby reducing the economic loss, The present invention provides a short-time on-period current test sample protection device capable of minimizing generation of gas, comprising: a power supply for supplying a short-circuit current to a test subject; Electric quantity detecting means for providing an electric quantity detecting signal according to the magnitude of the electric quantity applied to the test subject; And an electric quantity characteristic value to be applied to the test subject in accordance with the electric quantity detection signal from the electric quantity detection means is measured and calculated, and when the electric quantity characteristic value is not smaller than the predetermined reference characteristic value, A sample protection circuit for outputting a cutoff control signal for performing cutoff control; And a circuit breaker installed to be able to disconnect the power supply circuit between the power supply and the test object, and to cut off power supplied from the power supply to the test object in response to the cutoff control signal.

Description

{PROTECTING APPARATUS OF TEST OBJECT DURING SHORT-TIME WITH STAND CURRENT TEST}

The present invention relates to a short-time internal current test sample protection device capable of protecting a sample during a short-time internal current test for testing the thermal and mechanical strength of a power device product as a test object (sample).

The short-time withstand current test can be applied to several hundred thousand amperes (A) for low voltage (abbreviated as low pressure) or high voltage (abbreviated as high voltage) sample electric power equipment products (for example low pressure air circuit breaker, high voltage / ultra high voltage circuit breaker, disconnector, Of the test object (sample) is conducted for a short period of time, usually within 4 seconds, to verify the thermal and mechanical performance of the test object (sample).

The prior art construction and operation of this short-time withstand current testing apparatus will be described with reference to Fig.

The conventional short-time withstand current testing apparatus includes a power source 1, a circuit breaker 2, an electromagnetic switch 3, a reactor 4, a low-voltage transformer 5, a current detecting means 6, Means 7, a first amplifying circuit 9, a recorder 10, a patch panel 11, a timer 12, a LMS server (Laboratory Management System server) 13 , And a measuring computer 14.

In FIG. 1, reference numeral 8 designates a sample (subject to be tested), that is, a power device to be tested as described above.

The power supply (1) is a power supply that supplies short-circuit fault currents of several hundred thousand amperes (A) to the test circuit, and can be composed of a short circuit generator.

The three-phase alternating current from the power source 1 is supplied to the circuit breaker 2, the electromagnetic switch 3, the reactor 4, and the low-voltage Can be supplied to the sample (8) through the transformer (5).

The circuit breaker 2 is a three-phase circuit breaker capable of opening or closing a three-phase circuit, and can be controlled to an open position (shut down position, a trip position) by a shutoff control signal from the patch panel 11.

The closing switch 3 may be constituted by a switch which can be opened (power-off position) or closed (power-supply position) by a control signal from the LMS server 13. [

The reactor 4 can be limited by changing the short-circuit fault current level, which is composed of a tap-switching type current-like reactor and is limited according to the selection of the tap. The selection of the tap may be selected by the test operator in accordance with the current characteristics (rated short-circuit current, etc.) of the power device product as the test object.

The low-voltage transformer (5) supplies a test voltage to the sample (8) as a transformer capable of selecting a secondary-side voltage.

The current detecting means 6 is current detecting means connected to the three-phase line connected to the sample 8 from the secondary side output terminal of the low-voltage transformer 5 to measure and provide the current flowing through the three-phase line, And a Rogowski coil.

The current detection signal output by the current detection means 6 can be provided to the recorder 10. [

The voltage detecting means 7 is connected to a three-phase line constituted by a voltage-dividing resistor and leading from the secondary-side output terminal of the low-voltage transformer 5 to the sample 8, and detects the three-phase phase voltage.

The amplification circuit unit 9 is provided to be connected between the voltage detection unit 7 and the recorder 10 and amplifies the three phase voltage detection signal detected by the voltage detection unit 7 and provides the amplified voltage detection signal to the recorder 10 do.

The first amplifying circuit 9 can also be connected to the current detecting means 6 so that the first amplifying circuit 9 amplifies the current detecting signal outputted by the current detecting means 6 and supplies the amplified current detecting signal to the recorder 10. [ have.

The recorder 10 records an oscillogram waveform for the voltage detection signal of the voltage detection means 7 and the current detection signal from the current detection means 6 provided through the first amplification circuit portion 9. [

The recorder 10 is also connected to the patch panel 11 and the measuring computer 14.

The recorder 10 records the oscillation waveform for the current detection signal and the voltage detection signal provided through the first amplification circuit section 9 in response to a measurement trigger signal from the patch panel 11 can do.

The recorder 10 also provides the recorded computer 14 with the recorded current sense signal and the oscilloscope waveform for the voltage sense signal and provides the oscilloscope waveform to the measurement computer 14 via the measurement computer 14, The waveform can be displayed.

The patch panel 11 includes a timer 12, a recorder 10 and a signal generating circuit portion connected to the circuit breaker 2. The patch panel 11 outputs a time end signal (for example, a time end signal And generates a cutoff control signal in response to the timeout signal and outputs the cutoff control signal to the circuit breaker 2.

The patch panel 11 also generates the measurement end signal in response to the time end signal from the timer 12 and outputs it to the recorder 10.

The timer 12 is connected to the LMS server 13 and starts counting the set time (for example, 3 seconds) according to a control signal (test start signal) from the LMS server 13, And outputs it to the patch panel 11 and the LMS server 13.

The LMS server 13 is constituted by a server computer for controlling and monitoring the components included in the short-time withstand-current testing apparatus according to the related art, for example, the timer 12 and the closing switch 3, The timer 12, and the closing switch 3, respectively.

The LMS server 13 can output the control signal (test start signal) to the timer 12 for starting the test and output the control signal for closing the closing switch 3 to the closing switch 3 .

The LMS server 13 includes an input means such as a keyboard, an arithmetic and processing means for storing, computing, and processing data and programs, a signal output means for outputting signals, and a display means capable of displaying waveforms. A computer, a computer (desk top computer), a notebook computer (note book computer) or the like.

The measuring computer 14 is provided with an input means such as a keyboard, an arithmetic and processing means for storing, calculating and processing data and programs, a signal output means for outputting signals, and a display means And may be connected to the recorder 10 to display the current detection signal from the recorder 10 and the oscilloscope waveform for the voltage detection signal.

The operation of the short-time withstand-current tester according to the related art constructed as described above will be briefly described as follows.

The test operator 8 installs the sample (test subject) 8 in the short-time withstand current test apparatus according to the prior art as shown in Fig.

The test operator selects the secondary voltage of the low-voltage transformer 5 according to the rated voltage characteristic of the specimen 8 and selects the appropriate tap of the reactor 4 in accordance with the rated current characteristic of the specimen 8.

The test operator operates the operation position of the circuit breaker 2 and the sample 8 to the on state.

The test operator selects the time setting of the timer 12.

The test operator operates the recorder 10 and the measurement computer 14 in an ON state to put them into a test (measurement) standby state.

The test operator sets the output voltage of the short-circuit generator as the power source (1) and applies the set output voltage to the short-time internal current test apparatus circuit.

The test operator manipulates the LMS server 13 to output the control signal (test start signal) to the timer 12.

The LMS server 13 outputs a control signal for closing the closing switch 3 to the closing switch 3 so that the three-phase alternating current is supplied from the power supply 1 in accordance with the closing position operation of the closing switch 3, 4 and the low-pressure transformer 5 to the sample 8.

At this time, the current detection signal output by the current detection means 6 and the voltage detection signal for the three-phase phase voltage outputted by the voltage detection means 7 are provided to the recorder 10 via the first amplification circuit portion 9 .

The recorder 10 records an oscillogram waveform for the voltage detection signal of the voltage detection means 7 and the current detection signal from the current detection means 6 provided through the first amplification circuit portion 9 .

Simultaneously, the measuring computer 14 can display the current detection signal from the recorder 10 and the oscilloscope waveform for the voltage detection signal.

The timer 12 starts counting the set time (for example, 3 seconds) according to the control signal (test start signal) from the LMS server 13, And the LMS server 13.

The patch panel 11 receives a time-out signal (e.g., a time-out signal indicating the elapsed time of 3 seconds) from the timer 12, generates a cut-off control signal in response to the time- do.

The circuit connected to the closing switch 3, the reactor 4, the low voltage transformer 5 and the sample 8 at the rear end is shut off as the circuit breaker 2 operates at the cutoff position (trip position) 8 are interrupted.

The patch panel 11 also generates the measurement end signal in response to the time end signal from the timer 12 and outputs it to the recorder 10.

Therefore, the recorder 10 can stop the oscilloscope waveform recording for the current detection signal and the voltage detection signal in response to the measurement end signal.

Thereby, the short-time withstand current test operation for the sample 8 can be completed.

The test work can be terminated by the test operator operating the power supply of the short-circuit generator as the power supply 1 to the off position.

However, the above-described conventional short-time withstand current testing apparatus has the following problems.

That is, first, as for a normal power device product, there is no problem even if a short-circuit test current is supplied for a predetermined time. However, a sample whose thermal and mechanical performance is not normal due to poor assembly of a power device, ) Can break or explode.

Secondly, since there is no device to prevent accidents in the test circuit, the accident can spread to cause damage to the test circuit. Toxic gases generated in the event of an accident such as burnout or explosion will adversely affect the atmospheric environment around the test laboratory. It is possible.

Third, high-pressure and ultra-high-voltage power equipment among the samples is an expensive product, which causes economic loss when the test fails.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a method and apparatus for detecting the internal electric power of a sample during a short- The present invention provides a short-time internal current test sample protection device capable of minimizing damage, reducing economic loss, protecting the test circuit, and minimizing generation of harmful gas.

It is an object of the present invention to provide a short-time internal current test sample protection device,

A power supply for supplying a short circuit current to the test object;

An electric quantity detecting means connected to a line to which the electric power is supplied from the electric power source to the test subject to provide an electric quantity detection signal according to the magnitude of the electric power applied to the test subject;

And a control unit connected to the electricity quantity detecting unit for measuring and calculating an electric quantity characteristic value applied to the test subject in accordance with an electric quantity detection signal from the electricity quantity detecting unit, and when the electric quantity characteristic value is not smaller than a predetermined reference characteristic value, A sample protection circuit for outputting a cutoff control signal for shutting off the power supplied to the test object from the test object; And

And a circuit breaker provided in such a manner as to cut off the power supply circuit between the power supply and the test object and to shut off the power supply from the power supply to the test object in response to the cutoff control signal. Current test sample protection device.

According to a preferred aspect of the present invention, the electricity quantity characteristic value is a magnitude of a voltage or a current, and the reference characteristic value is a reference voltage value or a reference current value.

According to another preferred embodiment of the present invention, the electric quantity characteristic value is a magnitude of a voltage or current obtained by sampling an electric quantity detection signal from the electric quantity detection means for a predetermined time,

The reference characteristic value is a value determined by multiplying a maximum value among voltage or current magnitudes obtained by sampling for a predetermined time by a predetermined multiple.

According to another preferred embodiment of the present invention, the electric charge characteristic value is a rate of change of voltage or a rate of change of current, and the reference characteristic value is a reference voltage change rate or a reference current change rate.

According to another preferred aspect of the present invention,

Calculates a difference value from a previous sampling value with respect to a sampling value of a voltage or current obtained by SAMPLING the electric quantity detection signal from the electricity quantity detection means for a predetermined time and determines a maximum value among the calculated difference values, Is a value determined by dividing the difference value between the sampling value and the previous sampling value by the maximum value among the calculated difference values.

According to another preferred aspect of the present invention, if the difference between the current sampling value and the previous sampling value is greater than the determined maximum value, the sample protection circuit unit is configured to update and store the maximum value of the difference value.

According to another preferred embodiment of the present invention, the short-time endurance current test sample protection device according to the present invention is connected to the sample protection circuit part, and provides a control program to the sample protection circuit part and sets the reference characteristic value And a control program operating computer for providing an input means for operating the control program.

According to another preferred embodiment of the present invention, the short-time withstand-current test sample protection device according to the present invention is characterized by comprising a sample protection circuit section connected to the sample protection circuit section and configured to detect a waveform of the detected electricity quantity in accordance with an electricity quantity detection signal from the sample protection circuit section And further comprising a measuring computer for displaying in an oscillogram.

Since the short time duration current test sample protection apparatus according to the present invention includes the sample protection circuit section that outputs the cutoff control signal when the electrical quantity characteristic value is not smaller than the predetermined reference characteristic value, It is possible to prevent the damage of the test object (sample) to minimize the economic loss, to prevent the spread of accidents, to protect the test circuit, and to minimize the generation of harmful gas .

FIG. 1 is a block diagram showing the configuration of a short-time withstand-current testing apparatus according to the prior art,
FIG. 2 is a block diagram showing the entire configuration of a short-time withstand current test apparatus including a short-time in-line current test sample protecting apparatus according to a preferred embodiment of the present invention,
FIG. 3 is a flowchart showing a method and an operation of a short-period endurance current test sample protection apparatus according to a preferred embodiment of the present invention.

The above and other objects, features and advantages of the present invention will be more clearly understood from the following description of a preferred embodiment of the present invention with reference to the accompanying drawings .

As shown in FIG. 2, the short-time endurance current test sample protection device according to the preferred embodiment of the present invention includes a power source 1, current detection means 6 and voltage detection means 7 as electricity amount detection means, A sample protection circuit unit 15 and a circuit breaker 2.

FIG. 2 shows the overall configuration of a short-time withstand current testing apparatus including a short-time proof test apparatus according to a preferred embodiment of the present invention. As shown in FIG. 2, The apparatus includes an input switch 3, a reactor 4 and a low-voltage transformer 5, a first amplifying circuit 9, a recorder 10, a patch panel 11, a timer 12, a laboratory management system (LMS) server 13, and a second amplification circuit 17.

In FIG. 2, reference numeral 8 designates a sample, that is, a power device product to be tested. The sample 8 is provided so as to be connected to the output end of the low-voltage transformer 5 (i.e., the secondary coil portion).

The power supply 1 is a means for supplying, for example, a three-phase AC power supply corresponding to a short-circuit current to the test object, that is, the sample 8, and may be constituted by a short circuit generator as in the above-described conventional technique.

The three-phase alternating current from the power source 1 can be supplied to the sample 8 through the three-phase line via the circuit breaker 2, the electromagnetic switch 3, the reactor 4 and the low-voltage transformer 5 have.

The current detecting means 6 is current detecting means connected to the three-phase line connected to the sample 8 from the secondary side output terminal of the low-voltage transformer 5 to measure and provide the current flowing through the three-phase line, And a Rogowski coil.

The current detection signal output by the current detection means 6 may be provided to the sample protection circuit unit 15. [

The voltage detecting means 7 is connected to the test object, that is, the line to which power is supplied to the sample 8 from the power source 1, and supplies a voltage detection signal according to the magnitude of the voltage applied to the sample 8 . The voltage detecting means 7 is constituted by a voltage dividing resistor according to the preferred embodiment and is connected to a three-phase line from the secondary side output of the low-voltage transformer 5 to the sample 8, phase voltage.

The voltage detection signal output by the voltage detection means 7 may be provided to the sample protection circuit unit 15. [

The sample protection circuit portion 15 is connected to the current detection means 6 and the voltage detection means 7 and detects a current detection signal from the current detection means 6 and the voltage detection means 7 and a test The electric quantity characteristic value applied to the object (sample 8) is measured and calculated in real time.

When the electric quantity characteristic value is equal to or greater than a predetermined reference characteristic value, the sample protection circuit unit 15 outputs a cutoff control signal for shutting off the power supplied from the power supply 1 to the test subject (sample 8) .

According to a preferred aspect of the present invention, the electric quantity characteristic value is a magnitude of a voltage or a current, and the reference characteristic value is a reference voltage value or a reference current value. That is, when the electric quantity characteristic value is a voltage magnitude, the reference characteristic value becomes a reference voltage value, and when the electric quantity characteristic value is a current magnitude, the reference characteristic value becomes a reference current value.

According to another preferred aspect of the present invention, the electric quantity characteristic value is a rate of change of voltage or current, and the reference characteristic value is a reference voltage change rate or a reference current change rate. That is, when the electric charge characteristic value is a rate of change of the voltage, the reference characteristic value is the reference voltage change rate, and when the electric charge characteristic value is the rate of change of the current, the reference characteristic value is the reference current change rate.

The sample protection circuit unit 15 includes a microcomputer / microprocessor having a central processing unit and a memory for calculation and processing including a comparison between the magnitude of the detected electricity quantity and the reference electricity quantity or a comparison between the change rate of the detected electricity quantity and the change rate of the reference electricity quantity Lt; / RTI >

The sample protection circuit portion 15 may provide the current detection signal and the voltage detection signal to the recorder 10 so as to record an oscillogram waveform for the current detection signal and the voltage detection signal.

The sample protection circuit 15 can also provide the recorder 10 with the measurement trigger signal as an end signal so that the recorder 10 can finish recording the oscilloscope waveform.

The circuit breaker 2 is provided so as to be able to block the power supply circuit between the power supply 1 and the test object (sample 8). The circuit breaker 2 cuts off the power supplied from the power source 1 to the test object (sample 8) in response to the cutoff control signal from the sample protection circuit 15.

In FIG. 2, the short-time endurance test sample protection apparatus according to the preferred embodiment of the present invention may further include a control program operating computer 16 and a measurement computer 14.

The control program operating computer 16 is means for providing a control program to the sample protection circuit unit 15, which is connected to the sample protection circuit unit 15, and provides input means for setting the reference characteristic value.

The control program operating computer 16 has input means such as a keyboard, operation and processing means for storing, computing, and processing data and programs, and signal output means for signal output means and display means capable of displaying a waveform Such as a desktop computer, a notebook computer (note book computer), a portable terminal, and the like.

According to another embodiment, the sample protection circuitry 15 and the control program operating computer 16 may have a physical configuration that is integrally configured. In addition, the sample protection circuit unit 15 and the control program operating computer 16 may be constituted by one printed circuit board. When the sample protection circuit unit 15 and the control program operating computer 16 are integrally formed, the integral configuration stores and operates the control program, performs the above-described comparison operation and processing of the sample protection circuit unit 15 The cutoff control signal can be outputted and the current detection signal and the voltage detection signal can be transmitted to the recorder 10.

The measuring computer 14 is connected to the recorder 10 and can display the waveform of the detection voltage and the detection current according to the voltage detection signal and the current detection signal from the recorder 10 in an oscillogram.

The measuring computer 14 is provided with an input means such as a keyboard, an arithmetic and processing means for storing, calculating and processing data and programs, a signal output means for outputting signals, and a display means A computer, a notebook computer, or the like.

In the meantime, in the short-time withstand current testing apparatus including the short-time in-line current test sample protecting apparatus according to the preferred embodiment of the present invention, the remaining configuration except for the short-time in-current test sample protector will be described.

The remaining components are the input switch 3, the reactor 4 and the low-voltage transformer 5, the first amplifying circuit 9, the second amplifying circuit 17, the recorder 10, the patch panel 11, , The timer 12 and the LMS server 13 will be described.

The closing switch 3 may be constituted by a switch which can be opened (power-off position) or closed (power-supply position) by a control signal from the LMS server 13. [

The reactor 4 can be limited by changing the short-circuit fault current level, which is composed of a tap-switching type current-like reactor and is limited according to the selection of the tap. The selection of the tap may be selected by the test operator in accordance with the current characteristics (rated short-circuit current, etc.) of the power device product as the test object.

The low-voltage transformer 5 is a transformer that includes a primary side which is an input side and a secondary side coil which is a transformer output side, and which can select a secondary side voltage, and supplies a test voltage to the sample 8.

The first amplifying circuit 9 is connected between the voltage detecting means 7 and the recorder 10 and amplifies the voltage detecting signal of the three phases detected by the voltage detecting means 7, .

The first amplifying circuit 9 can also be connected to the current detecting means 6 so that the first amplifying circuit 9 amplifies the current detecting signal outputted by the current detecting means 6 and supplies the amplified current detecting signal to the recorder 10. [ have.

The second amplifying circuit unit 17 is connected between the recorder 10 and the sample protection circuit unit 15 and detects the current detection signal, the voltage detection signal, and the measurement The trigger signal can be amplified and output to the recorder 10.

The recorder 10 records the current detection signal from the current detection means 6 provided through the second amplification circuit portion 17 and the oscilloscope waveform for the voltage detection signal of the voltage detection means 7. [

The recorder 10 is also connected to the second amplifying circuit 17 and the measuring computer 14.

In response to the measurement trigger signal from the second amplifying circuit portion 17, the recorder 10 terminates the oscillation waveform recording for the current detection signal and the voltage detection signal provided through the second amplifying circuit portion 17 can do.

The recorder 10 also provides the recorded computer 14 with the recorded current sense signal and the oscilloscope waveform for the voltage sense signal and provides the oscilloscope waveform to the measurement computer 14 via the measurement computer 14, The waveform can be displayed.

The patch panel 11 is composed of a timer 12, a sample protection circuit 15 and a signal generating circuit connected to the circuit breaker 2. The patch panel 11 outputs a time end signal (for example, And outputs a shutoff control signal to the circuit breaker 2 in response to the timeout signal.

The patch panel 11 can generate the measurement trigger signal from the timer 12 in response to the time end signal and output it to the sample protection circuit unit 15. [

The patch panel 11 also receives a cutoff control signal from the sample protection circuit 15 and can transmit the cutoff control signal to the circuit breaker 2.

The timer 12 is connected to the LMS server 13 and starts counting the set time (for example, 3 seconds) according to a control signal (test start signal) from the LMS server 13, And outputs it to the patch panel 11 and the LMS server 13.

The LMS server 13 is constituted by a server computer for controlling and monitoring the components included in the short-time on-resistance testing device, for example, the timer 12 and the closing switch 3. For this purpose, , And is connected to the closing switch (3).

The LMS server 13 can output the control signal (test start signal) to the timer 12 for starting the test and output the control signal for closing the closing switch 3 to the closing switch 3 .

The LMS server 13 includes an input means such as a keyboard, an arithmetic and processing means for storing, computing, and processing data and programs, a signal output means for outputting signals, and a display means capable of displaying waveforms. A computer, a computer (desk top computer), a notebook computer (note book computer) or the like.

3 and FIG. 2, a description will be given of the operation of the short-time withstand-current test sample protection device and the test operation of the short-time in-line current test device according to a preferred embodiment of the present invention.

First, the operation of the short-time endurance test sample protection device according to one preferred embodiment of the present invention will be described with reference to FIG.

The sample protection circuit 15 executes a control program provided by the control program operating computer 16 or a built-in control program to operate as follows.

In step S1, the sample protection circuit unit 15 samples the voltage detection value applied to the sample 8 based on the voltage detection signal input from the voltage detection unit 7 through the first amplification circuit unit 9 (V max ) among these sampling values, and reads the difference between the previous sampling value and the present sampling value (V t , V t +1 , V t +2 ... V t + values (M t = 0, V t +1 - V t = M t +1, +2 V t - V t +1 = M t ... +2 +9 V t - V t = M t +8 +9 ) and calculates the maximum value (M MAX ) of the difference values .

Here, although the sampling value is not shown, it can be obtained by sampling the analog signal of the voltage detection signal by the analog-digital conversion circuit unit included in the sample protection circuit unit 15. [

The maximum value (M MAX) of the maximum value of (V max) and the difference value between the sampling values can be determined by the comparison of the comparing and the difference values between the sampled values.

In the next step S2, sample protection circuit unit 15 is this sampled value to the previous difference value between the sampled values and calculates the (+10 V t V t = M t +9 +9).

Proceeds to the next step S3, the sample protective circuit unit 15 is this sampling value and previous sampling value difference between - the rate of change {wherein the rate of change (V t V t +10 +9 +9 = M t) is M t + 9 is divided by the maximum value (M MAX ) determined in step S1. That is,

Figure pat00001
To compare exponential has} a preset reference is greater than or equal to the rate of change (Mref) obtainable by, or this in the size of the sampling values determined in step S1 sampled values, the maximum value (V max) compared to 1.2 times greater than or equal or of Or greater than or equal to a preset voltage value.

If "Yes" in step S3, that is, this sample value and the difference value between the previous sampling value (+10 V t - V t = M t +9 +9) is equal to or greater than a reference rate of change, or (Mref) the rate of change of the preset , this time of the sampling size of the sampling values of the value of the maximum value (V max) 1.2 times greater than or equal to or of the control operation of this surface, the size of sample values greater than or equal to a preset voltage value, the sample protective circuit section 15 The process proceeds to step S4.

If "NO" in step S3, that is, this sample value and the difference value between the previous sampling value (+10 V t - V t = M t +9 +9) less than the reference rate of change (Mref) the rate of change of a preset, or this If the magnitude of the sampled value is smaller than 1.2 times the maximum value of the sampling values (V max), or the size of this sampled value is less than a preset voltage value, the control operation of the sample protective circuit section 15 is a step S3-1 Go ahead.

First, the operation of step S3-1 will be described.

Difference between the sample protective circuit section 15 at step S3-1 is this sampling value and previous sampling values (V t +10 - V t = M t +9 +9) than the maximum value (M MAX) of the difference value Compare them.

If "YES" in step S3-1 that is, this sample value and the difference between the previously sampled values is greater than (V t V t +10 +9 +9 t = M) the maximum value (M MAX) of the difference value , The sample protection circuit 15 determines that the maximum value (M MAX ) among the difference values should be updated and proceeds to step S3-2.

"No" at step S3-1, if that is, this sample value and the difference value between the previous sampling value (+10 V t - V t = M t +9 +9) is less than the maximum value (M MAX) of the difference value, or If so, the sample protection circuit unit 15 determines that updating of the maximum value (M MAX ) among the difference values is not necessary, returns to step S2 and repeats the control operation in step S2.

In step S3-2, the sample protection circuit 15 updates the maximum value (M MAX ) among the difference values to M t +9 and stores it in the internal memory. Then, the control operation of the sample protection circuit unit 15 The flow advances to step S2 to repeat the step control operation.

On the other hand, in step S3 this sampling value and a previous difference between the sampling value (+10 V t - V t = M t + 9 + 9) is equal to or greater than a reference rate of change, or (Mref) the rate of change of a preset, and this sampled value the size of the sampling values, the maximum value (V max) 1.2 times greater than or equal to or a, this surface the size of the sampled values is greater than or equal to a preset voltage value, which of a critical enough to cause a current damage to the sample voltage or current The control operation of the sample protection circuit unit 15 proceeds to step S4.

The sample protection circuit 15 outputs the cutoff control signal to the patch panel 11 and the patch panel 11 transmits the cutoff control signal to the circuit breaker 2 so as to switch the circuit breaker 2 (Trip position).

The supply of the current to the sample 8 is stopped and the sample 8 can be protected from the dangerous voltage or current so that the damage of the test object (sample) is prevented, It is possible to minimize the loss, prevent the spread of accidents, protect the test circuit, and minimize the generation of harmful gas.

The test operation of the short-time withstand current testing apparatus including the short-time proof test apparatus according to the preferred embodiment of the present invention will be described with reference to FIG.

The test operator installs the sample (test object) 8 in the short-time internal current testing apparatus as shown in Fig.

The test operator selects the secondary voltage of the low-voltage transformer 5 according to the rated voltage characteristic of the specimen 8 and selects the appropriate tap of the reactor 4 in accordance with the rated current characteristic of the specimen 8.

The test operator operates the operation position of the circuit breaker 2 and the sample 8 to the on state.

The test operator selects the time setting of the timer 12 (for example, 3 seconds).

The test operator operates the recorder 10 and the measurement computer 14 in an ON state to put them into a test (measurement) standby state.

The test operator sets the output voltage of the short-circuit generator as the power source (1) and applies the set output voltage to the short-time internal current test apparatus circuit.

The test operator manipulates the LMS server 13 to output the control signal (test start signal) to the timer 12.

The LMS server 13 outputs a control signal for closing the closing switch 3 to the closing switch 3 so that the three-phase alternating current is supplied from the power supply 1 in accordance with the closing position operation of the closing switch 3, 4 and the low-pressure transformer 5 to the sample 8.

At this time, the current detection signal output by the current detection means 6 and the voltage detection signal with respect to the three-phase phase voltage output from the voltage detection means 7 are supplied to the first amplification circuit portion 9, the sample protection circuit portion 15, And can be provided to the recorder 10 via the second amplifying circuit portion 17. [

The recorder 10 records an oscillogram waveform for the voltage detection signal of the voltage detection means 7 and the current detection signal from the current detection means 6 provided through the second amplification circuit portion 17 .

Simultaneously, the measuring computer 14 can display the current detection signal from the recorder 10 and the oscilloscope waveform for the voltage detection signal.

At this time, if the electric quantity characteristic value is not smaller than the predetermined reference characteristic value, the sample protection circuit unit 15 outputs a cutoff control signal for shutting off the power supplied from the power supply 1 to the test subject (sample 8) Output. The detailed sample protection operation of the sample protection circuit unit 15 has been described above with reference to FIG. 3, and a duplicate description thereof will be omitted.

The timer 12 starts counting the set time (for example, 3 seconds) according to the control signal (test start signal) from the LMS server 13, And the LMS server 13.

The patch panel 11 receives a time-out signal (e.g., a time-out signal indicating the elapsed time of 3 seconds) from the timer 12, generates a cut-off control signal in response to the time- do. The generation and output of the shutoff control signal of the patch panel 11 in response to the time end signal from the timer 12 are performed in accordance with the monitoring operation of the sample protection circuit unit 15 applied to the sample 8, (15).

The circuit connected to the closing switch 3, the reactor 4, the low voltage transformer 5 and the sample 8 at the rear end is shut off as the circuit breaker 2 operates at the cutoff position (trip position) 8 are interrupted.

The patch panel 11 also generates the measurement end signal in response to the time end signal from the timer 12 and outputs it to the recorder 10.

Therefore, the recorder 10 can stop the oscilloscope waveform recording for the current detection signal and the voltage detection signal in response to the measurement end signal.

Thereby, the short-time withstand current test operation for the sample 8 can be completed.

The test work can be completely terminated by the test operator operating the power supply of the short-circuit generator as the power supply 1 to the off position.

As described above, the short time duration current test sample protection device according to the present invention can shut off the power supplied to the test subject when the electric quantity characteristic value is at a dangerous level, thereby preventing the damage of the test subject (sample) Can be minimized and the spread of accidents can be prevented to protect the test circuit and the occurrence of harmful gas can be minimized.

1: Power supply 2: Circuit breaker
3: closing switch 4: reactor
5: Low-voltage transformer 6: Current detection means
7: voltage detecting means 8: sample (subject to be tested)
9: first amplifying circuit part 10: recorder
11: Patch panel 12: Timer
13: Laboratory Management System server (LMS)
14: Measuring computer
15: sample protection circuit part 16: control program operation computer
17: Second amplifier circuit section

Claims (8)

In a short-time proof test sample protection device,
A power supply for supplying electric power corresponding to a short circuit current to the test object;
An electric quantity detecting means connected to a line to which the electric power is supplied from the electric power source to the test subject and providing an electric quantity detection signal according to the magnitude of the electric power applied to the test subject;
And a control unit connected to the electricity quantity detecting unit for measuring and calculating an electricity quantity characteristic value in accordance with the electricity quantity detection signal and for interrupting power supplied from the power supply to the test subject when the electricity quantity characteristic value is equal to or greater than a predetermined reference value A sample protection circuit for outputting a blocking control signal; And
And a circuit breaker installed between the power source and the test object to cut off the power in response to the cutoff control signal. The method according to claim 1,
Wherein the electrical quantity characteristic value is a magnitude of a voltage or a current and the reference characteristic value is a reference voltage value or a reference current value. 3. The method of claim 2,
The electric quantity characteristic value is a magnitude of voltage or current obtained by sampling the electric quantity detection signal for a predetermined time,
Wherein the reference characteristic value is a value determined by multiplying a maximum value among voltages or current magnitudes obtained by sampling for a predetermined time by a predetermined multiple. The method according to claim 1,
Wherein the electrical quantity characteristic value is a rate of change of voltage or current, and the reference characteristic value is a reference voltage change rate or a reference current change rate. 5. The method of claim 4,
The reference voltage change rate or the reference current change rate may be,
Calculating difference values from a previous sampling value with respect to a sampling value of a voltage or current obtained by SAMPLING the electric quantity detection signal for a predetermined time, determining a maximum value among the calculated difference values, And the difference value is a value determined by dividing the difference value by the maximum value among the calculated difference values. 6. The apparatus according to claim 5,
Wherein the maximum value of the difference value is updated and stored if the difference value between the present sampling value and the previous sampling value is larger than the determined maximum value. The method according to claim 1,
Further comprising a control program operating computer connected to the sample protection circuit section and providing a control program to the sample protection circuit section and providing input means for setting the reference characteristic value. The method according to claim 1,
Further comprising: a measurement computer connected to the sample protection circuit section for displaying an oscillogram of a waveform of the detected electricity quantity in accordance with an electrical quantity detection signal from the sample protection circuit section.
KR1020150101240A 2015-07-16 2015-07-16 Protecting apparatus of test object during short-time withstand current test KR20170009361A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107702847A (en) * 2017-07-21 2018-02-16 浙江绍兴苏泊尔生活电器有限公司 Vacuum detection method and system and cooking appliance
CN115327359A (en) * 2022-08-08 2022-11-11 中国舰船研究设计中心 Test method and test system for protection matching of alternating-current low-voltage circuit breaker

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107702847A (en) * 2017-07-21 2018-02-16 浙江绍兴苏泊尔生活电器有限公司 Vacuum detection method and system and cooking appliance
CN115327359A (en) * 2022-08-08 2022-11-11 中国舰船研究设计中心 Test method and test system for protection matching of alternating-current low-voltage circuit breaker
CN115327359B (en) * 2022-08-08 2024-04-12 中国舰船研究设计中心 Test method and test system for protection matching performance of alternating-current low-voltage circuit breaker

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