KR101797022B1 - Power-factor controller and test device including the same - Google Patents

Power-factor controller and test device including the same Download PDF

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KR101797022B1
KR101797022B1 KR1020150106817A KR20150106817A KR101797022B1 KR 101797022 B1 KR101797022 B1 KR 101797022B1 KR 1020150106817 A KR1020150106817 A KR 1020150106817A KR 20150106817 A KR20150106817 A KR 20150106817A KR 101797022 B1 KR101797022 B1 KR 101797022B1
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South Korea
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power factor
power
switches
switch
input power
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KR1020150106817A
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Korean (ko)
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KR20170013740A (en
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정상현
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엘에스산전 주식회사
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/006—Measuring power factor
    • 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

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

A power factor adjustment device is provided which can automatically adjust the power factor of the test power applied to the test device in the test device. The power factor adjusting device includes: a switch module having a plurality of switches connected in parallel to a first input power supplied from the outside; a switch driver for turning on at least one switch among the plurality of switches according to a control signal; Wherein a plurality of elements connected to each of the switches are provided and the power factor is adjusted by varying the total impedance by the plurality of elements along with the element connected to the at least one switch turned on by the switch driving unit, And a load module for adjusting the size of the first input power source and outputting the adjusted second input power to the second input power source.

Description

TECHNICAL FIELD [0001] The present invention relates to a power factor adjustment device and a test device including the power factor adjustment device.

The present invention relates to a power factor adjusting device and more particularly to a power factor adjusting device capable of automatically adjusting a power factor of a test power applied to an electric power device when testing an operation performance of a power device such as a breaker or a switchgear, .

The switchboard is an electrical equipment used to monitor, control and protect the power system. It is installed in a water distribution system that converts the high-voltage power to low pressure and supplies it to the customer facility to supply the power required by a wide range of power consumers. do.

The switchboards are divided into high voltage switchboards, low voltage switchboards, motor maneuvering boards, and distribution boards according to their functions and specifications. They are manufactured in individual states and installed in the field and used in conjunction with each other through connection works between switchboards.

In addition, the switchgear is divided into a high-voltage switchboard and a low-voltage switchboard based on the voltage to be used. Inside each switchboard, a circuit breaker (CB) is installed to shut off the fault current by the signal of the relay, ). The circuit breaker protects the circuit and the device by quickly isolating the circuit by extinguishing the arc generated in the break in the vacuum container.

On the other hand, since a high voltage and current are energized in the circuit breaker, operators and users are required to pay particular attention to safety. In the case of the circuit breaker, the connection state between the contact points is poor. It is necessary to verify and inspect the performance of the circuit breaker before and after shipment of the switchboard.

A conventional test apparatus constructs a transformer, generates a large power from the transformer, and supplies the generated power to the circuit breaker, thereby performing a test on the short circuit performance of the circuit breaker. In the conventional test apparatus, a power factor adjusting device is additionally provided between the transformer and the breaker, and the power factor of the power generated by the transformer is adjusted through the power factor adjusting device to provide the power factor as a circuit breaker.

In the power factor adjusting device, a device such as a resistor or an inductor is connected by a bus to form a predetermined impedance, and the power factor of the power generated in the transformer is adjusted by the impedance of the power factor adjusting device.

On the other hand, in the conventional testing apparatus, the operator adjusts the power factor by manually manipulating the bus bar of the power factor adjusting device to vary the magnitude of the impedance.

However, there is a risk that the time for performance test of the circuit breaker is increased according to the manual operation of the bus bar, and in particular, there is a risk that an accident may be caused by a large electric power flowing to the circuit breaker.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a power factor adjusting device capable of automatically changing an impedance value for power factor adjustment of a power supply and a test apparatus including the power factor adjusting device.

According to an aspect of the present invention, there is provided a power factor adjusting device comprising: a switch module having a plurality of switches connected in parallel to a first input power source, A switch driver for selectively turning on at least one of the plurality of switches according to a control signal; And a plurality of elements connected to the other side of each of the plurality of switches, wherein the total impedance of the plurality of elements along with the element connected to the at least one switch, which is turned on by the switch driver, And a load module for adjusting the power factor and adjusting the size of the first input power according to the adjusted power factor and outputting the second input power to the test equipment.

The switch driving unit includes a plurality of pneumatic cylinders disposed at positions corresponding to the plurality of switches, respectively, and at least one operation is controlled according to the control signal. And a plurality of rods respectively connected to the plurality of pneumatic cylinders and operated in a linear direction by at least one pneumatic cylinder to turn on / off the corresponding switches.

Wherein the plurality of elements of the load module are constituted by resistors or inductors.

Wherein the control signal is generated by a power factor value according to an operator input or a power factor value according to a predetermined program.

According to an aspect of the present invention, there is provided a testing apparatus comprising: a power supply for generating a first input power having a large power; A power factor adjusting unit adjusting a magnitude of the first input power supplied from the power unit according to a power factor and outputting the adjusted power to the second input power; A control unit for outputting a control signal for controlling the operation of the power factor adjusting unit; A test device operated according to the second input power source whose magnitude is adjusted and output from the power factor adjusting unit; And a monitoring unit monitoring and measuring an operating performance of the testing device, wherein the power factor adjusting unit comprises: a switch module having a plurality of switches each having one side connected in parallel to the first input power source; A switch driver for selectively turning on at least one of the plurality of switches according to the control signal; And a plurality of elements connected to the other side of each of the plurality of switches, wherein the total impedance of the plurality of elements along with the element connected to the at least one switch, which is turned on by the switch driver, And adjusts the power factor to adjust the magnitude of the first input power according to the adjusted power factor and output the adjusted power factor to the second input power source.

The test apparatus is a circuit breaker, and the monitoring unit monitors and measures the short circuit performance of the circuit breaker.

Wherein the plurality of elements are resistors or inductors and the load module adjusts the power factor in proportion to the magnitude of the resistors and inversely proportional to the size of the inductors by the plurality of switches of the switch module.

The power factor adjusting device of the present invention can adjust the power factor by varying the impedance of the load module by selectively driving at least one of the plurality of switches of the switch module according to a control signal.

Accordingly, the power factor adjusting device of the present invention can automatically adjust the power factor with respect to the input power as compared with the prior art, thereby preventing an increase in the performance test time of the test device and preventing the risk of a safety accident .

FIG. 1 is a block diagram illustrating a device operation performance testing apparatus provided with a power factor adjusting apparatus according to an embodiment of the present invention. Referring to FIG.
FIG. 2 is a diagram showing a configuration of the power factor adjusting unit shown in FIG. 1. FIG.
3 is a diagram showing the configuration of the switch driver shown in FIG.

Hereinafter, a power factor adjusting device according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram illustrating a device operation performance testing apparatus provided with a power factor adjusting apparatus according to an embodiment of the present invention. Referring to FIG.

Referring to FIG. 1, the testing apparatus 100 of the present embodiment may include a power supply unit 110, a power factor adjusting unit 120, a controller 140, a testing device 130, and a monitoring unit 150.

The power supply unit 110 can generate and output test power to be applied to the test equipment 130, which will be described later, for example, the first input power sources R, S, and T. The power supply unit 110 may be a transformer capable of generating three-phase power, and may output the first input power R, S, T of large power in accordance with the set reference.

The power factor adjustment unit 120 may output the second input power R ', S', T 'by adjusting the size of the first input power R, S, T output from the power unit 110. The power factor adjusting unit 120 may adjust the size of the first input power sources R, S and T according to the adjusted power factor by adjusting the power factor.

The power factor adjusting unit 120 may adjust the power factor according to a control signal CNT applied from the controller 140, which will be described later. The power factor adjusting unit 120 adjusts the magnitudes of the first input power sources R, S and T according to the power factor by increasing or decreasing the magnitude of the power factor so as to output them to the second input power sources R ', S' and T ' can do.

The power factor adjustment unit 120 may output the second input power sources R ', S', T 'by adjusting the power factor within the range of 0 to 1. At this time, as the power factor becomes 1, the second input power sources R ', S', and T 'may have the same magnitude as the first input power sources R, S, and T. As the power factor becomes 0, (R ', S', T ') may have a smaller magnitude than the first input power supply (R, S, T). The configuration and operation of the power factor adjusting unit 120 will be described later in detail.

The controller 140 may generate and output a control signal CNT for controlling the operation of the power factor adjusting unit 120. The control unit 140 may generate a control signal CNT according to an operator's input or may generate a control signal CNT according to a predetermined program. The control unit 140 may output the control signal CNT to the power factor adjusting unit 120 through the RS communication using the PLC.

The test equipment 130 may be operated by the second input power sources R ', S', T 'output from the power factor adjusting unit 120. The test apparatus 130 may be a breaker or the like.

The monitoring unit 150 may monitor the operation performance of the test equipment 130. When the test apparatus 130 is a circuit breaker, the monitoring unit 150 can monitor and measure the short circuit performance of the circuit breaker.

FIG. 2 is a diagram showing a configuration of the power factor adjusting unit shown in FIG. 1. FIG.

Referring to FIGS. 1 and 2, the power factor adjustment unit 120 may include a switch module 210, a switch driver 230, and a load module 220.

The switch module 210 may include a plurality of switches SW. The plurality of switches SW may be configured in the same number as the plurality of elements Z of the load module 220 to be described later.

Each of the plurality of switches SW may be connected in parallel between an output terminal of the power supply unit 110 and an input terminal of the load module 220. Each of the plurality of switches SW may include a pair of fixed contacts 215 electrically connected to an output terminal of the power source unit 110 and an input terminal of the load module 220, respectively. The plurality of switches SW are electrically connected to one of the fixed contacts 215 of the pair of fixed contacts 215 and are operated by the switch driver 230 to be in contact with the other fixed contacts 215 And a start contact point 211 that is connected to the contact point.

The switch driving unit 230 may turn on or turn off at least one of the plurality of switches SW of the switch module 210 according to the control signal CNT applied from the controller 140. [

The switch driving unit 230 can drive the starting contacts 211 of each of the plurality of switches SW according to the control signal CNT and can open or close the starting contact 211 and the fixed contact 215. [ .

The switch driving unit 230 may be a mechanical device corresponding to each of the plurality of switches SW.

3 is a diagram showing the configuration of the switch driver shown in FIG.

2 and 3, the switch driving unit 230 includes a plurality of pneumatic cylinders 231 and a plurality of pneumatic cylinders 231 disposed at positions corresponding to the plurality of switches SW of the switch module 210, And may include a plurality of rods 235 mounted at each end.

At least one operation of the plurality of pneumatic cylinders 231 can be controlled by the switch driver 230. The plurality of rods 235 may be linearly driven according to the at least one pneumatic cylinder 231 operated by the switch driver 230.

Here, the ends of the plurality of rods 235 may be positioned so as to correspond to the starting contacts 211 of the plurality of switches SW. The starting contacts 211 of the plurality of switches SW can be brought into contact with the fixed contacts 215 by a plurality of rods 235 operating in a linear direction. The fixed contacts 215 of the plurality of switches SW may be connected to the input terminal of the load module 220, that is, one side of the plurality of elements Z of the load module 220.

Referring again to FIG. 2, the load module 220 includes a plurality of elements Z, and each of the plurality of elements Z may be connected to a plurality of switches SW of the switch module 210 in a corresponding manner. The plurality of elements Z may be composed of resistors or inductors having different values.

The connection structure of the plurality of elements Z may vary depending on the operation of at least one switch SW among the plurality of switches SW of the switch module 210. [ Accordingly, the magnitude of the total impedance of the load module 220 is changed, and the power factor can be adjusted by the variable impedance.

The load module 220 adjusts the magnitudes of the first input power sources R, S and T applied from the power source unit 110 according to the adjusted power factor so that the second input power sources R ', S', T ' Can be output. The second input power (R ', S', T ') may be applied to the test equipment 130.

More specifically, the total impedance of the load module 220 may be zero while all of the plurality of switches SW of the switch module 210 are turned off.

Then, the switch driver 230 controls the operation of the switch module 210 according to the control signal CNT, so that one of the plurality of switches SW can be turned on. The switch driving unit 230 operates at least one of the plurality of pneumatic cylinders 231 in accordance with the control signal CNT and the rod 235 is moved in the linear direction by the pneumatic cylinder 231 to be operated, At least one starting contact 211 of the plurality of switches SW may be in contact with the fixed contact 215.

As described above, at least one of the plurality of switches SW is turned on by the switch driving unit 230, so that the load Z of the load module 220 connected to the turn- The total impedance of the antenna 220 may vary from 0 to a predetermined value.

The magnitude of the power factor of the power factor adjusting unit 120 is adjusted according to the variable impedance and the size of the first input power sources R, S, T applied to the power factor adjusting unit 120 is adjusted by the magnitude- Can be output to the second input power source (R ', S', T ').

As described above, the power factor adjustment unit 120 of the present embodiment selectively turns on or off the plurality of switches SW of the switch module 210 to adjust the magnitude of the total impedance of the load module 220 to a variable S 'and T' by adjusting the magnitudes of the first input power sources R, S and T applied from the power source unit 110 by adjusting the power factor by the variable impedance, Can be output.

Here, the first input power sources R, S, and T and the second input power sources R ', S', and T 'according to the power factor may have a relationship expressed by Equation 1 below.

[Equation 1]

Figure 112015073483050-pat00001

Here, P1 denotes a first input power source, P2 denotes a second input power source, and cos? Denotes a power factor.

The power factor due to the total impedance of the load module 220 is proportional to the magnitude of the resistance of the load module 220 when each of the plurality of elements Z of the load module 220 is constituted by a series connection of a resistor and an inductor. And can be sized to be inversely proportional to the size of the inductor.

As described above, in the test apparatus 100 according to the present invention, the switch driver 230 drives the switch module 230 according to a control signal CNT generated by a power factor value according to an operator's input or a preset power factor value according to a predetermined program The power factor can be adjusted by varying the impedance of the load module 220 by selectively driving at least one of the plurality of switches SW of the load module 220.

Accordingly, the test apparatus 100 of the present invention can automatically adjust the power factor of the input power according to the set power factor in comparison with the conventional test apparatus, so that the performance test time of the test apparatus 130 increases Can be prevented. In addition, in the testing apparatus 100 of the present invention, since the operator does not have to manually adjust the power factor adjusting unit 120, the risk of occurrence of an accident due to a large electric power flowing in the testing apparatus 100 can be blocked.

While a number of embodiments have been described in detail above, it should be construed as being illustrative of preferred embodiments rather than limiting the scope of the invention. Therefore, the invention should not be construed as limited to the embodiments described, but should be determined by equivalents to the appended claims and the claims.

100: Test apparatus 110: Power supply unit
120: Power factor adjustment unit 210: Switch module
220: load module 230: switch driver
130: Tester 140:
150:

Claims (7)

A switch module having a plurality of switches connected in parallel to a first input power source,
A switch driver for selectively turning on at least one of the plurality of switches according to a control signal; And
Wherein a plurality of elements are connected to the other side of each of the plurality of switches and the total impedance is varied by an element connected to the at least one switch among the plurality of elements turned on by the switch driving unit, And a load module for adjusting the power factor by varying the total impedance by the plurality of devices and controlling the size of the first input power source according to the adjusted power factor and outputting the adjusted second power to the testing device A power factor adjustment device. The method according to claim 1,
The switch driver includes:
A plurality of pneumatic cylinders disposed at positions corresponding to the plurality of switches, respectively, wherein at least one operation is controlled according to the control signal; And
And a plurality of rods respectively connected to the plurality of pneumatic cylinders and operated in a linear direction by at least one pneumatic cylinder to turn on / off the corresponding switches. The method according to claim 1,
Wherein the plurality of elements of the load module comprise resistors or inductors. The method according to claim 1,
Wherein the control signal is generated by a power factor value according to an operator input or a power factor value according to a predetermined program. A power supply for generating a first input power of large power;
A power factor adjusting unit adjusting a magnitude of the first input power supplied from the power unit according to a power factor and outputting the adjusted power to the second input power;
A control unit for outputting a control signal for controlling the operation of the power factor adjusting unit;
A test device operated according to the second input power source whose magnitude is adjusted and output from the power factor adjusting unit; And
And a monitoring unit for monitoring and measuring the operational performance of the testing equipment,
Wherein the power-
A switch module having a plurality of switches each having one side connected in parallel to the first input power source;
A switch driver for selectively turning on at least one of the plurality of switches according to the control signal; And
A plurality of elements connected to the other side of each of the plurality of switches is provided and the total impedance is varied by an element connected to the at least one switch turned on by the switch driving unit among the plurality of elements to adjust the power factor And adjusting the power factor by varying the total impedance by the plurality of devices to adjust the size of the first input power according to the adjusted power factor and outputting the adjusted power factor to the second input power source And a test apparatus for testing the test apparatus. 6. The method of claim 5,
Wherein the test apparatus is a circuit breaker,
Wherein the monitoring unit monitors and measures short circuit performance of the circuit breaker. 6. The method of claim 5,
Wherein the plurality of elements are resistors or inductors,
Wherein the load module adjusts the power factor in proportion to the magnitude of the resistor and inversely proportional to the size of the inductor by the plurality of switches of the switch module.
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101173507B1 (en) * 2012-04-20 2012-08-14 안희석 Automatic power factor correction system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101173507B1 (en) * 2012-04-20 2012-08-14 안희석 Automatic power factor correction system

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