KR200321219Y1 - Apparatus for measuring an on/off time of the contact pole in a vacuum breaker - Google Patents

Abstract

The present invention relates to a contactor open time measuring device of a high pressure vacuum circuit breaker, and to prevent the failure of the circuit breaker in advance by enabling a simple and accurate measurement of the vacuum contactor test.

To this end, the present invention, the power supply unit for supplying the power supply for the operation of the vacuum circuit breaker and the operation unit respectively; A three-phase selection switch and a reset switch are provided, and a frequency generator for generating an alternating frequency, a plurality of integrated semiconductors for driving the plurality of digital counters, a contact for detecting an operation signal of a measuring device, a liquid crystal display reset contact, and a liquid crystal display A counter generator for receiving the clock signal CLK, the reset signal R, and the latch signal L from the breaker contact contact for holding and generating a count value result according to the contactor opening / closing time of the vacuum circuit breaker, and zero blank integration An arithmetic unit comprising a circuit unit; A display unit having a liquid crystal display capable of digitally displaying a counter value for contact opening and closing time; A connector for supplying power to the vacuum breaker from the power supply unit; Provided is a contactor open / close time measurement device for a vacuum circuit breaker including a plurality of terminal connections for electrical connection to a three-phase vacuum contactor.

Description

Apparatus for measuring an on / off time of the contact pole in a vacuum breaker}

The present invention relates to a contactor open time measuring device of a high-pressure vacuum circuit breaker, and more particularly, to simplify the test of the vacuum contactor and to prevent the failure of the vacuum circuit breaker by accurate measurement in advance, and to easily understand the life of the contactor. It is a device for measuring contactor switching time of a high-pressure vacuum circuit breaker to ensure that stable power is supplied when power is supplied to the equipment by sufficient test and adjustment in advance.

Generally known high pressure vacuum circuit breaker 20, as shown in Figure 1, is installed in a state stored in the inner lower portion of the high-pressure panel 10, the control panel 11 for controlling the circuit breaker is installed at the top It is configured to open / close the breaker using the manual switch 11a.

FIG. 2 is a perspective view illustrating the vacuum breaker, showing a body drawn out from the high pressure panel, including a cylinder 21 for mechanically opening and closing the vacuum contactor 30, and three vacuum contactors ( 30) and a plurality of main circuit terminals 22a to 22f.

3A and 3B illustrate an open / closed state of a vacuum contactor occurring inside the vacuum breaker of FIG. 2, wherein the open contact state of the vacuum contactor is shown in FIG. 3A. The lowered state, that is, the movable electrode 30a and the fixed electrode 30b are separated, and the closed electrode state of the vacuum contactor is a state in which the contact pole adjusting screw 34 is raised upward, that is, the movable electrode as shown in FIG. 3B. 30a and the fixed electrode 30b are in contact with each other.

4 is a reference diagram for explaining a contact test state of a conventional vacuum circuit breaker, after drawing the vacuum circuit breaker 20 stored in the high pressure panel 10 to the outside while maintaining the connector 50 connected to the upper control panel as it is. When the internal circuit is operated by twisting the manual handle switch 11a for operating the breaker of the control panel to the left, the operation relay AX is finally closed and the power is supplied through the connector 50 to draw the outside of the vacuum breaker 20. The excitation coil is energized to operate the mechanical cylinder to close the contactor 30 instantaneously (3/60 seconds) while the two terminals of the main circuit part are contacted to form a closed circuit. At this time, the indication value 40a of the prepared directive indicating circuit tester 40 is moved in a direction indicating zero ohms.

5 is a reference diagram showing a test state of a three-phase vacuum contactor of a conventional vacuum circuit breaker. When power is supplied to the vacuum circuit breakers 31, 32, and 33, the movable electrodes 31a and 32a of the three-phase vacuum contactor are turned on by an input device. And 33a are closed in contact with each of the fixed electrodes 31b, 32b, and 33b at the same time, wherein the instructions 41a, 42a, 43a of the circuit testers 41, 42, and 43 simultaneously operate to the left at the same time. It can be confirmed by the examiner's naked eye. However, for example, when the fixed electrode 33b and the movable electrode 33a of the one-phase contactor are later or faster than the other two-phase contactors 31 and 32 due to abnormal wear, misalignment and mechanical defects, the naked eye Since the indicator needle 43a of the visible circuit tester 43 is different from the indicator needles 42a and 41a of the other two circuit testers 42 and 41, at this point, the examiner visually observes the degree of movement of the indicator needle around. By judging, it is possible to distinguish whether or not the three-phase vacuum contactor is closed at the same time.

However, according to the prior art as described above, since the vacuum breaker is connected to the high pressure panel being used and the test is performed using its own power supply and the switch, there is a safety risk of working close to the high pressure.

In addition, since the contact operating time is tested using an analog circuit tester, the indicator hands of a plurality of circuit testers operating at the same time should be visually identified to distinguish the difference in the operating time. The three-phase contactor of the vacuum circuit breaker that lost the test opportunity for this reason can be set differently in operating time such as wear, poor initial adjustment, and the switching time between the three-phase contactors When they are different from each other, the fixed and movable poles inside the three-phase contactor are worn out by arcing and mechanical shock, which causes damage to components of the vacuum circuit breaker due to severe electrical shock and burnout due to overcurrent. I had a lot of problems.

The present invention was devised to solve the above problems, and it is possible to simplify the test of the vacuum contactor and to prevent the failure of the vacuum breaker by accurate measurement, and to easily detect the life of the vacuum contactor, and to replace the vacuum contactor. It is an object of the present invention to provide a contact open / close time measuring device for a high-pressure vacuum circuit breaker that can be supplied with stable power when the power is supplied to the equipment by sufficient test and adjustment in advance.

1 is a perspective view of a high-pressure panel with a built-in vacuum circuit breaker

Figure 2 is a perspective view of the vacuum circuit breaker of Figure 1

3A and 3B are diagrams illustrating a state of opening and closing the vacuum contactor in the vacuum circuit breaker of FIG.

4 is a reference diagram for explaining a contact test state of a conventional vacuum circuit breaker;

5 is a reference diagram showing a test state of the three-phase vacuum contactor of the conventional vacuum circuit breaker

6 is an external perspective view of a contactor open time measuring device of a high pressure vacuum circuit breaker according to the present invention;

FIG. 7 is a DC power circuit for operating a vacuum circuit breaker and a DC power circuit for operating an operation unit and a square wave pulse generator circuit included in the power supply unit of FIG. 6.

FIG. 8 is a detailed view of a main operation circuit built in the operation unit of FIG.

9 is an operation timing diagram for each part of FIG. 8.

10 is a test state diagram using a contactor open time measuring device of a high-pressure vacuum circuit breaker according to the present invention

11 is a test state diagram of a three-phase contactor using the contactor open time measuring device of the high-pressure vacuum circuit breaker according to the present invention

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

10: high pressure panel 11: control panel

11a, 20a: manual switch 20: vacuum breaker

21: cylinder 22a-22f: main circuit terminal

30, 31, 32, 33: contactor 30a, 31a, 32a, 33a: contactor movable pole

30b, 31b, 32b, 33b: Contact fixed electrode 31c, 32c, 33c, 34: Spacing nut

40, 41, 42, 43: analog tester 40a, 41a, 42a, 43a: indicator hand

100: DC power supply circuit for circuit breaker operation 100a, 200a: rectifier circuit

101: AC power cord 200: DC power supply circuit for operation unit

201: transformer 300: square wave pulse generating circuit

301: integrated semiconductor 300c: variable resistor

600: liquid crystal display 600a ~ 600d: digital counter

601: frequency generator 602a-602d: integrated semiconductor for counter operation

603a: contact for detecting motion signal 603b: reset contact for liquid crystal display

604a: breaker contact contact 605: counter generator

607: zero blank integrated circuit unit 710: power supply unit

711: main power switch 712: breaker on / off switch

720: Connector 720a-720c: Terminal Connection

730 operation unit 731 reset switch

732,733,734: phase selection switch 740: display

In order to achieve the above object, the present invention includes a power supply unit including a power circuit for operating a vacuum circuit breaker and a power supply circuit for operating an operation unit; A phase selection switch and a reset switch for selecting three phases (R phase, S phase, T phase), a frequency generator for generating an AC frequency, a plurality of integrated semiconductors for driving the plurality of digital counters, respectively; Opening and closing the contactor of the vacuum circuit breaker by receiving the clock signal CLK, the reset signal R and the latch signal L from the contact for detecting the operation signal of the measuring device and the reset contact for the liquid crystal display and the breaker contact for maintaining the liquid crystal display, respectively. An operation unit comprising a counter generator for generating a count value result according to time, and a zero blank integrated circuit unit; A display unit comprising a plurality of digital counters, the display unit having a liquid crystal display capable of displaying a counter value for contact opening and closing time in a digital form; A connector for supplying power to the vacuum breaker from the power supply unit; Provided is a contactor open / close time measurement device for a vacuum circuit breaker including a plurality of terminal connections for electrical connection to a three-phase vacuum contactor.

The objects, features and advantages of the present invention will be more readily understood by reference to the accompanying drawings and the following detailed description.

Hereinafter, the configuration and operation of the present invention with reference to the accompanying drawings in detail as follows.

6 is an external perspective view of a contactor open / close time measuring device of a high-pressure vacuum circuit breaker according to the present invention, and a power supply 710, a calculation unit 730, a display unit 740, and a connector 720 for inputting power to the breaker from the power supply unit. ) And a plurality of terminal connections 720a, 720b, and 720c for electrical connection to the three-phase vacuum contactor.

A power circuit 100 (refer to FIG. 7) for operating a vacuum circuit breaker is embedded in the power supply unit 710, and a power supply circuit 200 (refer to FIG. 7) and a square wave pulse generator circuit for operation are included in the operation unit 730. 7 and the main operation circuit of FIG. 7 are installed, and the main power switch 711 for operating the apparatus and the on / off switch 712 for inputting the circuit breaker for the input of the circuit breaker are respectively installed therein. It is configured to control the operation of the power supply circuit. Although not shown in the drawing, the main power switch and the circuit breaker input on / off switches should be connected to the circuit so as to electrically open and close the power circuit built in the power supply.

The operation unit 730 is provided with phase selection switches 732,733,734 and reset switch 731 for selecting three phases (R phase, S phase, T phase), and the display unit 740 includes a plurality of digital counters. Indicator 600 (see FIG. 8) may be configured.

FIG. 7 is a diagram illustrating a DC power supply circuit 100 for operating a vacuum circuit breaker included in the power supply unit of FIG. 6, a DC power supply circuit 200 for operating a calculation unit incorporated in a calculation unit, and a square wave pulse generator circuit 300. The DC power supply circuit 100 is composed of a rectifying circuit 100a connected directly to an external AC power cord 101 to convert AC power to DC power. The DC power supply circuit 200 for operation of the operation unit is the external power supply. A transformer 201 that is directly connected to the AC power cord 101 of the transformer and changes the external AC input voltage, and a rectifier circuit 200a that converts AC power into DC power at the rear end of the transformer. The pulse generating circuit 300 generates a square wave pulse using the integrated semiconductor 301 and is configured to adjust the frequency from several hundreds to tens of thousands of frequencies using the variable resistor 300c. And it is configured to be able to continue to generate the required square wave pulse.

FIG. 8 is a detailed view of a main operation circuit included in the operation unit of FIG. 6, and is a main circuit diagram configured to enable digital display by measuring a contactor open / close time of a vacuum circuit breaker.

As shown in FIG. 8, a liquid crystal display 600 including a plurality of digital counters 600a to 600d and capable of digitally displaying a counter value for contact opening and closing time, and a frequency generator 601 for generating an AC frequency. ), A plurality of integrated semiconductors 602a-602d for driving the plurality of digital counters respectively, a contact signal 603a for detecting the operation signal of the measuring device, a reset contact 603b for the liquid crystal display, and a circuit breaker for holding the liquid crystal display. A counter generator 605 which receives a clock signal CLK, a reset signal R, and a latch signal L from the contact point 604a, respectively, and generates a count value result according to the contactor opening / closing time of the vacuum circuit breaker; It consists of small components, such as the blank integrated circuit part 607.

FIG. 9 is an operation timing diagram for each part of FIG. 8, in which the pulse contents supplied to the operation signal detection contact 603a of the main operation circuit of FIG. 8 and the count contents of the counter generator and the zero blank circuit portion 607 are provided. The input pulse value and the like are shown.

10 is a test state diagram using a contactor open-time measurement device of the high-pressure vacuum circuit breaker according to the present invention, the terminal connection portion 720c of the contactor open-time digital measurement device according to the present invention in a state in which the vacuum circuit breaker 20 is completely drawn out to the outside. ) Is connected to the main circuit terminal of the vacuum contactor 30 to indicate the state of testing.

11 is a test state diagram of a three-phase contactor using the contactor open / close time measuring device of the high-pressure vacuum circuit breaker according to the present invention, and maintains the original open state after closing the closed state of the three-phase contactors 31, 32, and 33. The result value is displayed on the design device.

Referring to the operation of the present invention made of such a configuration as follows.

Referring to FIG. 7, when commercial frequency power is input to the power supply device 100 for operating the vacuum breaker, it is full-wave rectified in the rectifier circuit 100a including the semiconductor diodes D1-D4 and the capacitor C to supply the vacuum breaker input power. A smoothed DC power supply is output.

At the same time, when commercial AC power is supplied to the DC power supply 200 embedded in the calculation unit of the contactor open / close time measuring device, the transformer 201 generates the required voltage and smoothes the direct current in the rectifier circuit 200a. Power is output. The square wave pulse generating circuit 300 connected to the rear end of the DC power supply unit can supply a constant square wave pulse to the calculation unit of the contactor open / close time measuring device, and the amount of change of the pulse can be adjusted by the variable resistor 300c. The output pulse is connected to the input switch of the contactor open / close time measuring device. Therefore, the higher the frequency (tens of thousands of hertz), the more accurate the time displayed on the liquid crystal display can be displayed with 4 decimal places.

The main operation circuit of FIG. 8 illustrates a four-digit counter circuit having a zero blank function using a static liquid crystal display, for example. When a square wave pulse is input through an input switch contact 603a of a contactor open / close time measuring device, The counter generator 605 having a four-digit decimal count function sequentially outputs time division from the upper digit of the decimal output (non-CD code). At this time, when the input of the reset contact 603b is '1', the counter contents are reset.

Accordingly, each of the digital counters 600a, 600b, 600c, and 600d operates by an internal oscillator of the digital counter driving integrated semiconductors 602a to 602d to generate an output, and its initial value is set to '0' so that the latch function can be used. After the test, the display contents of the liquid crystal display can be erased using the manual switch 604a.

In the contactor opening and closing time measuring device of such a configuration, after applying the commercial power through the plug 101, the main power switch 711 used for operating the device is operated and the on / off switch 712 used for the breaker input power When the operation, the power supply for the vacuum breaker input through the connector 720 is delivered to the breaker 20. In this case, when the connectors 720a to 720c are connected to the primary and secondary sides of the three-phase vacuum contacts 31, 32, and 33, and the phase selection switches 732, 733, and 734 are operated for each contact of the operation unit 730, the liquid crystal display ( The time is counted and displayed on the display panel 600, and when the reset switch 731 is pressed, the display number of the liquid crystal display 600 is erased.

That is, the moment the main power switch 711 is pressed the power is turned on the vacuum breaker 20 and the opening and closing time of the vacuum contactor for each phase is displayed on the liquid crystal display 600, if the error for the operation time between each three phases When different times are generated on the liquid crystal display 600, the state of the vacuum contactor can be accurately known from the outside. Therefore, the movable poles 31a, 32a, 33a of the vacuum contactors 31, 32, and 33 are at this time. By adjusting the air gap as the adjusting screws (31c, 32c, 33c) installed in the) to be able to adjust the contact opening and closing time of the vacuum circuit breaker to match.

According to the contactor opening and closing time measuring device of the vacuum circuit breaker according to the present invention, it is possible to easily eliminate the breaker breaker by the easy and accurate measurement of the vacuum contactor test, which is the most important part of the vacuum circuit breaker, which occupies most of the high-voltage power supply of steelworks. In addition, it also contributes to stable facility management by preventing inrush current at the site of high voltage motors and facilities at the same time, and prevents mechanical shock, and eliminates the risk of working near high voltage by eliminating the use of the breaker panel itself. The benefits of preventing accidents at the same time can be obtained.

Claims (1)

A power supply unit comprising a power supply circuit for operating a vacuum circuit breaker and a power supply circuit for operating an operation unit; A phase selection switch and a reset switch for selecting three phases (R phase, S phase, T phase), a frequency generator for generating an AC frequency, a plurality of integrated semiconductors for driving the plurality of digital counters, respectively; Opening and closing the contactor of the vacuum circuit breaker by receiving the clock signal CLK, the reset signal R and the latch signal L from the contact for detecting the operation signal of the measuring device and the reset contact for the liquid crystal display and the breaker contact for maintaining the liquid crystal display, respectively. An operation unit comprising a counter generator for generating a count value result according to time, and a zero blank integrated circuit unit; A display unit comprising a plurality of digital counters, the display unit having a liquid crystal display capable of displaying a counter value for contact opening and closing time in a digital form; A connector for supplying power to the vacuum breaker from the power supply unit; Apparatus for measuring the contactor opening and closing time of the vacuum circuit breaker comprising a plurality of terminal connections for electrical connection to the three-phase vacuum contactor.