KR100389117B1 - Apparatus for testing of short and over road - Google Patents

Abstract

The present invention is a device for testing the short circuit and overload of a specific test object, it is possible to perform a short circuit and overload experiment as a single device, using a commercial power source without the need for a separate device for generating the experimental power The present invention relates to a short circuit and an overload combination apparatus that can be performed.

To this end, the present invention further includes an experiment selection unit for selecting one of a short circuit and an overload experiment, and a short circuit affecting short circuit capacity, short circuit current, output waveform, and short circuit shape of a wire by adjusting a change in the position of a specific short terminal. It provides an effect that can be more easily adjusted according to the needs of the experimenter.

Description

Short circuit and overload tester {APPARATUS FOR TESTING OF SHORT AND OVER ROAD}

The present invention relates to a device for testing the short circuit and overload of a particular test object, and more particularly, to a combined short circuit and overload test device that can perform the two experiments in one device.

In general, the short circuit test apparatus used in the existing large power experiments, if the breaker can cut off the fault current of a certain amount within a predetermined time when the power system accident occurs, or until the protection system operates Short-term withstand current tests to determine whether they can withstand, and arc tests to verify the operation of the equipment against large current arcs.

1 and 2 show a block diagram and a flow chart of a conventional short-circuit experiment apparatus. Referring to this, since the existing short circuit test apparatus was used for a large power test, a power source for the short circuit test should be generated. Therefore, the power supplied from the power input unit 31 is converted into the experimental power in the power generator 32 and supplied (S300, S310). When performing the experiment with the supplied power, the protection unit 33 composed of breakers and switchgear, etc. installed to protect the experimenter and the device from the failure of the experimental device generated during the experiment determines whether the experimental device is broken (S320). ). If it is determined that there is no abnormality of the experimental apparatus, the control unit 34 converts the power to the experimental voltage and current value set by the experimenter, and short-circuits the test object in the short circuit unit 35 (S330 to S350). At this time, the experimental data such as the voltage, current value, and / or operating time applied to the test object is stored in the recording device 36 (S360).

If an abnormality occurs in the experimental apparatus during the short-circuit test, the protection device is immediately operated and the power is cut off (S370 and S380).

In addition, in the overload experiment, as shown in Equation 1 below, when the power consumption is constant, the voltage and current are inversely established, and when the voltage decreases, the current increases. Use a method of increasing the current.

3 and 4 show a block diagram and an operation flowchart of a conventional overload experiment apparatus. Referring to this, when the power is input from the power input unit 21, when the failure occurs during the experiment, the protection unit 22 consisting of a circuit breaker and a switch installed to protect the experimenter and the device, and the current value set by the experimenter Control unit 23 for converting the voltage to adjust the experimental power, and the output unit 24 is connected to the external connection terminal the voltage converted from the control device.

When the power is input from the power input unit 21 (S200), it is determined whether any abnormality has occurred in the overload test apparatus and a failure state (S210). If normal, it is determined whether the input power is the experimental current value (S220). . If it is not the experimental current value, change the voltage value to match the experimental current value (S230, S240), and if the experimental current value, output the current through the output device 24 (S250). In the step of determining whether there is an abnormality of the test apparatus, if the overload test apparatus is determined to be in a fault state, the protection device is operated and the power is cut off (S260 and S270).

Therefore, in order to test the short circuit and the overload, the experiment must be performed with different devices, and a separate device for generating an experimental power is required. There is no problem. In addition, since there is no separate device for adjusting the short circuit angle during the wire short circuit test, it is not possible to perform a repeated test maintaining the same short circuit angle during the test, and the overload test apparatus has a problem that the voltage applied to the test object is lowered.

The present invention has been made to solve the above problems, the object of the present invention can perform a short circuit and overload experiment as a single device, using a commercial power source without the need for a separate device for generating experimental power It is to provide a short circuit and overload combined test apparatus that can perform the experiment.

One embodiment of the present invention for achieving the above object is a power input unit for supplying power; A protection unit connected to the power input unit and configured as a circuit breaker or a switch to determine whether or not a test object is broken when power is supplied from the power input unit, and cut off the power supplied to the test object when the test object is determined to be a failure. ; A control unit connected to the protection unit and converting power supplied from the power input unit into experimental power set by an experimenter; An experiment selection unit connected to the control unit and configured to include a plurality of switch elements to select and input one of a no-load short circuit test, a load short test, or an overload test; A load control unit connected to the experiment selection unit and converting the experiment power into an experiment current set by an experimenter according to the selected experiment type and applying the experiment power to the experiment object; A short circuit unit connected to the load control unit and shorting the test object when a short circuit angle is adjusted and an experimental current is applied from the load control unit; And a recording unit connected to the load control unit and the short circuit unit and configured to measure and record an experimental data value including a voltage, a current, and an operating time applied to the test object. In addition, in order to achieve the above object, an embodiment of the present invention includes two fixed short-circuit terminals in which the short-circuit is fixedly positioned in a straight line; Two movable short terminals each positioned in the same column as the two fixed short terminals and moving up and down; A connecting line made of a conductor connecting each fixed short terminal and a movable short terminal at a diagonal point to be spaced apart from each other; And a position change means for interconnecting the movable short terminals so that the movable short terminals can change positions at the same time.

1 is a block diagram of a conventional short circuit test apparatus

2 is an operation flowchart of a conventional short-circuit experiment apparatus

3 is a block diagram of a conventional overload experiment apparatus

4 is an operation flowchart of a conventional overload test apparatus

5 is a circuit diagram of a short circuit and overload combined use experiment of the present invention

6 is a circuit diagram illustrating an embodiment of FIG. 5.

7 is a circuit diagram illustrating another embodiment of FIG. 5.

8 is a circuit diagram illustrating another embodiment of FIG. 5.

9 is a block diagram of a combined short circuit and overload experimental apparatus of the present invention

10 is a view showing a short circuit angle control unit of the short circuit and overload experimental apparatus of the present invention

FIG. 11 is a side view of a short circuit terminal that is a part of FIG. 10. FIG.

12 is a flow chart of the operation of the short circuit and overload combination apparatus of the present invention

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

41: power input unit 42: protection unit

43: control unit 44: experiment selection unit

45: load control unit 46: short circuit

47: recording section A, B, C, D: short terminal

52: position changing means 54: elastic member

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

Fig. 5 is a circuit diagram of a short circuit and overload test apparatus of the present invention, and Figs. 6, 7, and 8 are circuit diagrams during no load short circuit test, load short test and overload test, respectively. Referring to this, the short circuit and overload experimental apparatus circuit of the present invention is a circuit breaker 52 that serves to cut off the circuit when the current exceeds the allowable for the circuit protection, and a transformer for converting the input power to the experimental voltage ( 56), a load control unit 55 in which a plurality of different resistors and switches are connected in parallel in pairs to adjust the load, and an experiment selection unit 53 for selecting a type of experiment according to on / off of the switch. And a short circuit angle adjusting unit 57.

In particular, the experiment selection unit 53 is composed of three switches and the type of experiment performed according to the on / off state of each switch is shown in Table 1 below.

Experiment type S1 S2 S3 No-load short circuit ON OFF OFF Load short circuit ON ON OFF Overload experiment OFF OFF ON

In addition, the load control unit 55 has a resistor and a switch having different values are connected in series with one load, and the plurality of loads are connected in parallel, so that the load can be adjusted by turning on one or more switches.

In particular, the short-circuit angle adjusting unit 57 for changing the short-circuit capacitance, short-circuit current, output waveform, short-circuit shape of the wire, and the like will be more easily understood by referring to FIGS. 10 and 11.

10 is a view showing the structure of the short circuit angle control unit 57, (a) is the front surface of the short circuit angle control unit 57, (b) shows the rear surface. Four shorting terminals A, B, C, and D are respectively provided at the corners of the square shape, and the shorting terminals of the corresponding diagonal positions are connected to each other by conductor connecting lines. At this time, the two connecting lines are spaced apart from each other.

Short terminals A and B are fixed fixed short terminals, and short terminals C and D are movable short terminals formed to be movable up and down. The movable short terminals C and D are connected by position changing means 62 made of an insulator so as to move up and down simultaneously with each other, and as the positions of the movable short terminals C and D are changed, The short angle formed by the intersection changes.

In particular, the grooves 66 and 67 are formed in a moving direction of the movable short terminals C and D in order to support the position change of the movable short terminals C and D. FIG.

Comparing Fig. (B) with Fig. (C), it can be seen that the shorting angle is changed from θ 'to θ' 'as the movable short terminals C and D move.

Here, the two connecting lines are spaced apart from each other, but as shown in FIG. 11, the spring 64 included between the position changing means 62 and the shorting protrusion 63 of the shorting terminal is adjusted according to the needs of the experimenter. By the vertical movement of the rope 65, the crossing portions of the connecting lines spaced apart are short-circuited with each other.

In particular, the spring 64 is included in at least one of the four short-circuit terminals A, B, C, and D, and may be included in each of the four.

9 and 12 show a configuration diagram and an operation flowchart of a combined short circuit and overload experimental apparatus according to the present invention. Referring to this, the apparatus is an experiment to select one of the power input unit 41, the breaker and / or switch unit 42, the control unit 43, the short circuit or overload test is supplied with commercial power The selection section 44, the load control section 45, the short circuit section 46 and the recording section 47 for recording and storing the experimental data.

The operation of the apparatus having the above configuration is as follows. First, when a commercial power source such as 110V or 220V is input, the controller checks whether there is an abnormality, and when it is confirmed that there is nothing wrong with the experiment, the experimenter selects either a short circuit or an overload test (first experiment selection). Will be (S400 ~ S420).

If the selected experiment is a short-circuit experiment, the experimenter adjusts the short-circuit angle using the position changing means of the short-circuit terminal, and the voltage value of the input commercial power is changed according to the short-circuit angle to be adjusted at this time (S430 to S450). In addition, the experimenter selects one of the load shorting test in which the switch S2 and S3 of the test selector are open and no current flows to the load control unit, and the load short test in which the switch S3 of the test selector is opened during the short test (second Experiment selection), if the load short-circuit experiment, the experimenter sets the experimental current value and outputs the current, and if the no-load short-circuit experiment, the circuit is short-circuited and ends by recording and storing the experimental data in the recording device (S460 to S510).

When the experimenter selects the overload experiment in the first experiment selection, the experiment is terminated by setting an experimental current value and outputting a current to apply an overload (S520), and then recording and storing the experiment data in the recording device.

Meanwhile, before performing the first experiment selection, it is determined whether there is an abnormality of the apparatus of the present invention, and if there is a failure, the protection device operates immediately so that the power is cut off so that the experimenter or the experiment apparatus is not damaged.

The present invention is not limited to the embodiments described above, and various modifications and changes can be made by those skilled in the art, which are included in the spirit and scope of the present invention as defined in the appended claims.

As described above, the present invention can be experimented by selecting a short circuit test and an overload test with a single device, the experiment is possible using a commercial power supply, and also affects the short circuit capacity, the short circuit shape of the wire, the current capacity There is an advantage that can change the short circuit angle that affects the needs of the experimenter.

Claims (6)

delete delete delete A power input unit for supplying power; A protection unit connected to the power input unit and configured as a circuit breaker or a switch to determine whether or not a test object is broken when power is supplied from the power input unit, and cut off the power supplied to the test object when the test object is determined to be a failure. ; A control unit connected to the protection unit and converting power supplied from the power input unit into experimental power set by an experimenter; An experiment selection unit connected to the control unit and configured to include a plurality of switch elements to select and input one of a no-load short circuit test, a load short test, or an overload test; A load control unit connected to the experiment selection unit and converting the experiment power into an experiment current set by an experimenter according to the selected experiment type and applying the experiment power to the experiment object; A short circuit unit connected to the load control unit and shorting the test object when a short circuit angle is adjusted and an experimental current is applied from the load control unit; And It is connected to the load control unit and the short circuit, and comprises a recording unit for measuring and recording the experimental data value including the voltage, current, operating time applied to the test object, Two short circuit terminals fixedly disposed in a straight line; Two movable short terminals each positioned in the same column as the two fixed short terminals and moving up and down; A connecting line made of a conductor connecting each fixed short terminal and a movable short terminal at a diagonal point to be spaced apart from each other; And And a position change means for interconnecting the movable short terminals so that the movable short terminals can be simultaneously changed. The method of claim 4, wherein Short circuit and overload combined use apparatus, characterized in that the position changing means further comprises a groove formed in the moving distance of the movable short terminal to facilitate the vertical movement. The method of claim 4, wherein At least one of the fixed short-circuit terminal or the movable short-circuit terminal further comprises a resilient member between the position change means and the shorting point short circuit and overload experimental apparatus.