KR101568845B1 - Switchgear improved vibration sensing function - Google Patents

Abstract

The present invention relates to a switchgear with an improved vibration sensing function, capable of detecting a weak point of the switchgear according to the generation of the vibration through an experiment, sensing a vibration by installing a vibration sensor in the corresponding point and controlling the switchgear by an operation in a preset mode according to the strength of the vibration. According to the present invention, provided is the switchgear capable of easily detecting the weak vibration by installing the vibration sensor in the weak point of the switchgear according to the generation of the vibration and easily dealing with the vibration by improving the sensing of the vibration. Provided is the switchgear with the improved vibration sensing function capable of properly dealing with the vibration condition according to the preset mode.

Description

{SWITCHGEAR IMPROVED VIBRATION SENSING FUNCTION}

More particularly, the present invention relates to a switchgear with improved vibration sensing function, and more particularly to a switchgear which detects a weak point of a switchboard according to an occurrence of vibration, The present invention relates to a switchboard in which a vibration detection function capable of controlling a switchboard by an operation of a mode is improved.

The switchboard is a device that receives high-voltage or extra-high voltage electricity supplied from a power plant or substation, converts it to a voltage used by the customer, and distributes it to the load facility. Such a switchboard has a cubicle structure called a cubicle on the surface. Inside the switchgear, there are power devices such as high-voltage switchgear, instrumental current transformer, high-voltage switchgear, transformer and low-voltage distribution circuit breaker, protective relays and instruments for power system protection and monitoring Electrical parts and the like are mounted. Inside the cubicle, besides electric power equipment, wiring for measurement and monitoring of booth bar and power equipment is connected, which connects power equipment according to the power system.

When the external vibration or shock due to the crustal fluctuation occurs, the electrical components such as the electric power equipment inside the switchgear, the wiring connecting the electric power equipment and the protection relay are liable to be damaged or damaged. Failure to follow may result in interruption of power supply and fire. In addition, when an external vibration (for example, an earthquake or the like) occurs at a predetermined level or more, it is necessary to control the electric power to be cut off to prevent electric shock and fire due to electricity.

Accordingly, in order to detect earthquake and control the distribution power, a distribution board having an earthquake detection function is disclosed in Japanese Patent Application Laid-Open No. 10-1035647.

The technique includes an enclosure that accommodates a controller for a fault zone automatic switch, a controller for a load switch disconnector, and an alarm buzzer; A base for seating the enclosure and fixing it to the ground; An earthquake detection sensor mounted on a bottom surface of the base through a fixing hole formed on the bottom surface to detect a vibration state of the ground and generate a 'vibration state signal' according to the detected vibration state; And an earthquake control device for analyzing the 'vibration state signal' inputted through the earthquake detection sensor and generating an alarm signal or a power control signal according to the degree of magnitude.

In addition, Japanese Laid-Open Patent Publication No. 10-2015-0006206 discloses a switchboard having a composite sensor.

The present invention relates to a composite sensor including a vibration sensor for detecting vibration when an earthquake or an earthquake occurs and a water level sensor for sensing the flow of water into the inside of the case, And a control unit for controlling the alarm speaker.

However, the above-mentioned technologies are based on the assumption that the vibrations generated by the earthquake are transmitted through the entirety of the switchboard, and that the earthquake sensor (or vibration sensor) is installed. Results. That is, the shape of the earthquake transmitted to the switchboard can be different depending on the shape of the switchboard, the internal structure, and the structure of the subdivision.

In addition, there is a need to control the power according to the earthquake occurrence frequency as well as the earthquake occurrence frequency and the earthquake acceleration.

KR 10-1035647 B1 May 05, 2011. KR 10-2015-0006206 A 2015. 01. 16.

The present invention has been made to solve the above-mentioned problems of the prior art and to cope with the demand. A problem to be solved by the present invention is to detect weak points due to vibration according to a frame structure of a power plant, The present invention provides a switchboard having a vibration sensing function that can control power before a power transmission system is damaged by external vibration such as an earthquake by installing a sensor.

Another object of the present invention is to provide a switchboard in which a vibration detection function capable of controlling power according to not only the degree of vibration generated from the outside but also the frequency of vibration and the instantaneous acceleration of vibration is improved.

According to an aspect of the present invention, there is provided a switchboard having an improved vibration sensing function, the switchboard comprising: an outer frame having a hexahedron shape; A horizontal frame provided in the inner side of the outer frame to horizontally divide the upper space part and the lower space part; A vertical frame installed vertically to the lower space part and partitioning into a front space and a middle space part; A bottom frame installed on a bottom side of the lower space part and connected to a lower end of the vertical frame; A plate cover closing the outside of the outer frame; A door installed on the front and rear surfaces of the plate cover, respectively; A controller panel installed on the front door; And a vibration sensing device included in the controller panel for sensing a vibration generated from the outside of the enclosure and controlling power input in a setting mode, wherein the vibration sensing device is installed on the floor frame, A vibration detection sensor unit; A controller for controlling the output of the breaker control signal, the communication signal, and the alarm signal based on the setting mode by receiving the vibration value detected by the vibration detection sensor and displaying the state information including the received vibration value, ; A memory unit for storing and managing the setting mode; A display unit for displaying the status information under the control of the control unit; A communication unit for transmitting and receiving a communication signal with an external device under the control of the control unit; And a shutdown signal output unit for outputting a trip signal to the breaker installed in the enclosure under the control of the control unit.

A first mode for outputting a trip signal for opening the breaker when the setting mode exceeds the set vibration value and for outputting an alarm signal when the set vibration value is within a range of 80 to 100% A second mode for outputting an alarm signal when the number of times belonging to the range of 75 to 79% of the set vibration value is accumulated five times; A third mode for outputting an alarm signal when the number of times in the range of 30 to 74% of the set vibration value is accumulated 30 times for a predetermined time; A fourth mode for outputting an alarm signal when the cumulative integrated value for the set acceleration exceeds 10 times the set vibration value; And a fifth mode for outputting an alarm signal when the cumulative integrated value for the set acceleration exceeds the set vibration value within a set period of time.

In this case, the set vibration value is an earthquake scale of 6.3 to 7.0, and the set acceleration is 0.2 to 0.3 g.

The vibration sensing device may further include a current sensing sensor installed on a secondary side of the circuit breaker to detect a current, and when the current detected by the current sensing sensor is absent, Thereby stopping the operation.

According to the present invention, since a vibration detection sensor is installed at a weak point of a power transmission / reception panel according to vibration generation, a weak vibration can be easily detected, thereby improving vibration detection and facilitating coping with vibration. .

In addition, it is possible to provide a switchgear with improved vibration sensing capability that can respond to vibration modes according to a set mode.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic block diagram of a vibration sensing device applied to a switchboard with improved vibration sensing function according to the present invention; FIG.
FIG. 2 and FIG. 3 are views showing a frame structure and an enclosure of a switchboard to which a vibration sensing function according to the present invention is applied. FIG.
4 is a view illustrating a measurement point of a switchboard applied to a switchboard having improved vibration sensing function according to the present invention.
5 is a graph showing the time-dependent acceleration at points 1 to 6 and the time-dependent stress at the point where the maximum stress occurs for one selected seismic wave among the seismic waves.
6 is a graph of stress-time for determining a threshold value.
FIG. 7 is a view showing a Mises stress distribution as a result of an analysis performed by applying seismic loads to a power plant. FIG.
8 is a view showing the breaker mounting member separated into an attachment point A, a body point B and an end C;
9 is a table showing the acceleration detected at the connection point A and the detection results of the deflection and inclinations of the points A and B for 18 selected natural seismic waves.

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

The present invention provides a vibration detection function capable of detecting a weak point of a switchboard according to vibration occurrence and detecting a vibration by installing a vibration detection sensor at the corresponding point, and controlling the switchboard by an operation in a mode set according to the vibration intensity This relates to an improved switchboard.

FIG. 1 is a schematic block diagram of a vibration sensing device applied to a switchboard with improved vibration sensing function according to the present invention.

1, a vibration sensing apparatus 100 applied to a switchboard having a vibration sensing function according to the present invention includes a vibration sensing unit 110, a control unit 120, a memory unit 130, a display unit 140 A communication unit 150, a blocking signal generating unit 160, an input unit 170, an alarm generating unit 180, and a current sensing unit 190.

Here, the vibration sensing apparatus 100 is a device for controlling the power input in the setting mode by sensing the vibration generated from the outside of the cabinet enclosure, and the vibration sensing apparatus 100 may be configured to be included in the controller panel of the enclosure have.

The vibration detection sensor unit 110 detects vibration and outputs the detected vibration as a vibration value. The vibration detection sensor unit 110 detects a vibration occurring when an earthquake or an earthquake occurs due to an external impact or a natural phenomenon, and outputs the detected value as a detection value.

The control unit 120 receives the vibration value detected by the vibration detection sensor unit 110 and controls the display unit 120 to display status information including the received vibration value. Based on the setting mode, Signal and an alarm signal.

The memory unit 130 stores and manages the setting mode, and stores and manages information according to the role of the switchboard.

The display unit 140 displays the live information and the status information of the switchboard under the control of the controller 120. The live-line information includes the level of the power reception / distribution voltage and the breaker trip information, and the status information includes the setting mode, the vibration value, the vibration frequency, and the acceleration information.

Here, the voltage level can be configured to require the user to pay attention to safety accidents by displaying a special high voltage (22.9 kV), high voltage (6.6 kV, 3.3 kV), low voltage (440 V, 380 V, 220 V)

The communication unit 150 transmits / receives a communication signal to / from an external device under the control of the controller 120. That is, the communication unit 150 communicates with an external device through a communication protocol, and transmits data according to the control of the controller 120 or transmits the received data to the controller 120. [

The cut-off signal generator 160 outputs a trip signal to the breaker installed in the outer frame 10 under the control of the controller 120. The trip coil of the breaker is excited by the output trip signal, .

The input unit 170 is for receiving an operation signal, and may be constituted by a keypad or the like formed by a combination of numbers / letters.

According to design conditions, the display unit 140 and the input unit 170 may have a single structure. For example, when the display unit 140 is configured as a touch screen, the display unit 140 and the input unit 170 may be configured to be operated under the control of the controller 120.

The alarm generator 180 outputs an alarm signal generated under the control of the controller 120. At this time, the output alarm signal may be composed of a warning sound such as a sound or a warning light which can be visually confirmed, and may be configured to operate both an alarm sound and a warning light in accordance with design conditions.

The current sensing unit 190 performs a function of sensing a current. The current sensing unit 190 includes a current transformer for sensing a primary current by measuring a secondary current by winding a primary coil and a secondary coil using a donut- And a Hall element type in which the intensity of the magnetic field, that is, the intensity of the current, is sensed by measuring Hall voltage by providing a Hall element in the magnetic field generated by the current.

The circuit breaker (CB) performs the function to prevent the transmission of the accident by blocking the converter against the abnormal current. The circuit breaker used at the low pressure has a small breaking capacity and hardly generates vibration during operation. However, The breaker used has a large breaking capacity and is accompanied by vibration during operation. That is, the circuit breaker applied at a high voltage or higher may be accompanied by considerable vibration during excitation of the trip coil according to manual or automatic operation, and the vibration value may be output from the vibration detection sensor unit 110. Therefore, the vibration generated by the operation of the circuit breaker should be excluded.

When the current detected by the current detecting sensor unit 190 is absent, the controller 120 detects the current detected by the vibration detecting sensor unit 110 ) Or to ignore the vibration value detected by the vibration detection sensor unit 110. [0064] According to other design conditions, the vibration sensing apparatus 100 is operated only when the current value detected by the vibration sensing unit 110 is equal to or greater than a predetermined value, so that vibration due to the operation of the circuit breaker can not be detected .

In order to select the optimum position of the vibration sensing unit 110 in the vibration sensing apparatus 100, the enclosure of the power transmission and distribution panel is specified and the stress generation test is performed on the specified enclosure.

Experiment. Measuring the operating threshold of a vibration sensor applied to the switchboard

1. Enclosure of switchgear

The outer shape of the switchboard applied to the switchboard with improved vibration sensing function according to the present invention is 1450 mm, 2600 mm and 2300 mm in the left and right, the height and the length are 3.2 mm in the case of the main frame, 1.6 mm and 2.3 mm in the other frames, Respectively.

FIG. 2 and FIG. 3 are views showing a frame structure and an enclosure of a switchboard to which a vibration sensing function according to the present invention is applied.

3 (a) is an internal configuration diagram of a switchboard according to an embodiment of the present invention. FIG. 3 (b) is a front view of the switchboard.

2 and 3, the switchboard according to the present invention includes an outer frame 10 having a hexahedron shape, an outer frame 10 disposed horizontally inside the outer frame 10, A vertical frame 30 installed vertically inside the lower space part and dividing into a front and rear space and an intermediate space part; a lower frame 30 installed on the bottom side of the lower space part, A front cover 60 and a rear cover 70 installed on the front and rear surfaces of the plate cover 50 and the rear door 70 And a controller panel 80 installed on the front door 60. Reference numeral 85 denotes a status display window of the protection relay.

At this time, the controller panel 80 may be provided with a vibration sensing device 100 for sensing the vibration generated from the outside of the enclosure and performing different operations to control power input. Here, the execution of the different operation can be performed by the setting mode.

Considering the physical characteristics of the materials used as well as the elastic and inelastic regions as well as the materials constituting the outer shape of the above-configured switchgear, the protective relays, meters, breakers, transformers, deflectors, disconnectors and insulators Were modeled as organically coupled switchgear. In this case, among the devices installed in the switchboard, since the breaker and the current transformer are heavy in weight compared to other devices, they can be used by modeling the switchboard considering only the structure of the frame, the breaker and the current transformer.

2. Natural Frequency Calculation

In the event of damage to the switchboard due to external vibrations including earthquakes, it is necessary to stop the operation by shutting off the power before the damage of the switchboard, because secondary damage such as fire in the building may occur due to short- have.

As a result of eigenvalue analysis to confirm the natural frequency of the switchboard according to FIG. 2, the natural frequency of the switchboard was calculated to be 21.782 Hz.

Here, since the state of the switchboard for the actual external environment must be evaluated, the earthquake load can be experimented by using natural seismic waves instead of artificial earthquakes. In other words, the natural seismic waves collected data on representative earthquakes occurring on the earth, and applied the total time of the earthquake load and the duration of the maximum acceleration.

3. Selection of measuring point

An analysis was conducted to determine the appropriate data point to select the threshold for stopping the operation of the switchboard. When an actual earthquake occurs, it is not possible to directly measure the stress acting on the switchboard, so the type of sensor should be determined through analysis.

Since there is no direct correlation between displacement and slope value in the region other than the point of maximum stress generation, appropriate data derivation points are selected based on the acceleration value in the region other than the maximum stress generation point.

Since the acceleration data is calculated differently according to the position of the switchboard, the acceleration-time relation curve at various points is measured and compared with the stress-time curve at the point where the maximum stress occurs, .

FIG. 4 is a view showing a measuring point of a switchboard applied to a switchboard with improved vibration sensing function according to the present invention. FIG. 5 is a graph showing the time- And the time-dependent stress of the point.

4. Threshold setting

The steel yield strength of the frame was 164.6MPa and the permissible stress was set to 98.76MPa, which is 60% of the yield strength according to the shear fracture safety factor of steel construction engineering.

FIG. 6 is a graph of a stress-time for determining a threshold value. As a result of the stress-time analysis, the stress is continuously increasing or decreasing, but the magnitude of the stress is continuously increasing. Therefore, the sensor output value (acceleration, deflection, deflection angle) was set to a threshold value at a time point (time) immediately before reaching the first 98.76 MPa set as the allowable stress of the frame.

5. Earthquake Load Analysis

Fig. 7 is a diagram showing the Mises stress distribution as a result of an analysis performed by applying seismic load to a power plant.

Referring to FIG. 7, it can be seen that stress is generated in the front and side surfaces of the switchboard such as the top, left and right shield plates of the enclosure, and stress is concentrated at the ends of the circuit breaker mounting member where the circuit breaker is located. That is, the end of the circuit breaker mounting member is the point where the bottom frame 40 (see Fig. 2) and the bottom side outer frame 10 (see Fig. 2) are overlapped.

Here, the acceleration threshold at the end of the circuit breaker mounting member (bottom frame 40) was 0.3524 g, and the deflection threshold was 0.2535 mm.

Here, the breaker is divided into the connection point (A), the body point (B), and the end (C), and the experiment is repeated by applying natural seismic waves to each point.

8 is a view showing the breaker mounting member divided into connection points A, body points B and ends C and FIG. 9 is a view showing an example in which the acceleration detected at the connection point A with respect to 18 selected natural seismic waves acceleration, deflection and inclinations of points A and B, respectively.

Referring to FIG. 9, the highest peak critical acceleration at the connection point (A) is about 0.49 g and the minimum critical acceleration is 0.25 g. Therefore, the acceleration threshold value can be determined to be the minimum value of 0.25 g.

The determined acceleration threshold corresponds to an earthquake scale between 6.3 and 7.0 and corresponds to the  Ⅷ of the mercurial class.

When the acceleration threshold value determined as described above is applied to the vibration sensing apparatus 100, it may be configured to open and close the converter in consideration of cumulative fatigue due to external vibration.

That is, the frame coupled by the accumulated vibration may have a different seismic load, so that the converter may be blocked through various modes or output an alarm signal.

Accordingly, the present invention can be configured to output an alarm signal or a trip signal to shut off the electric power by applying various setting modes in the switchboard having improved vibration detection function according to the present invention.

In the present invention, the setting mode can be classified into five types, and the five modes are as follows.

The first mode

The first mode is a mode for outputting a trip signal for opening the breaker when the detected vibration value exceeds the set vibration value, and outputting an alarm signal when the detected vibration value falls within the range of 80 to 100% of the set vibration value.

At this time, the set vibration value may be set to an earthquake scale of 6.3 to 7.0 and may be configured to be adjustable.

If the set vibration value is exceeded, the trip signal of the breaker is outputted, and the trip coil of the breaker is excited according to the output trip signal to open the converter.

Also, in the course of operating the switchboard in the first mode, an alarm signal is output when it falls within the range of 80 to 100% of the set vibration value.

The second mode

And the second mode is a mode for outputting an alarm signal when the number of times that the detected vibration value belongs to the range of 75 to 79% of the set vibration value is accumulated five times.

Third mode

The third mode is a mode for outputting an alarm signal when the number of times that the detected vibration value belongs to the range of 30 to 74% of the set vibration value is accumulated 30 times for a predetermined time.

Fourth mode

The fourth mode is a mode for outputting an alarm signal when the cumulative integrated value for the set acceleration exceeds 10 times the set vibration value.

At this time, the set acceleration may be set to 0.2 g to 0.3 g, and it may be configured to be adjustable. Preferably, the set acceleration can be set to 0.25 g derived from the experiment.

Fifth mode

The fifth mode is a mode for outputting an alarm signal when the cumulative integrated value for the set acceleration exceeds the set vibration value within the set period.

At this time, the setting period can be designated in units of one year, and the cumulative integrated value can be adjusted to 10g to 100g.

Here, 1 g is 9.8 m / s ² .

The second to fifth modes, except for the first mode, output an alarm signal, which can be used as data for performing maintenance on the switchboard according to the alarm signal.

The switchboard can be operated according to the configured mode, but it can be operated in the integrated mode according to the design conditions.

The integrated mode operates integrally with the first to fifth modes. When the vibration mode belongs to one of the five modes according to vibration values and accelerations transmitted from the outside, the integrated mode displays the corresponding mode, . ≪ / RTI >

According to the present invention, since a vibration detection sensor is installed at a weak point of a power transmission / reception panel according to vibration generation, a weak vibration can be easily detected, thereby improving vibration detection and facilitating coping with vibration. .

In addition, it is possible to provide a switchgear with improved vibration sensing capability that can respond to vibration modes according to a set mode.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: outer frame 20: horizontal frame
30: vertical frame 40: bottom frame
50: Plate cover 60,: Front door
70: Rear door 80: Controller panel
100: Vibration sensor
110: Vibration detection sensor unit 120: Control unit
130: memory unit 140: display unit
150: communication unit 160:
170: input unit 180: alarm generating unit
190: Current sensing unit

Claims (5)

An outer frame 10 of a hexahedron forming an enclosure;
A horizontal frame 20 horizontally installed in the outer frame 10 and partitioning the upper and lower spaces into an upper space and a lower space;
A vertical frame (30) vertically installed in the lower space part and dividing into a front space and an intermediate space part;
A floor frame (40) installed at the bottom side of the lower space part and connected at the lower end of the vertical frame (30);
A plate cover 50 for finishing the outside of the outer frame 10;
A front door 60 and a rear door 70 installed on the front and rear surfaces of the plate cover 50, respectively;
A controller panel (80) installed on the front door (60); And
And a vibration sensing device (100) included in the controller panel (80) for sensing the vibration generated from the outside of the enclosure and controlling the input of power in a setting mode,
The vibration sensing device (100)
A vibration detection sensor unit 110 installed at an end of the circuit breaker member to which the bottom frame 40 and the outer frame 10 are coupled to sense a vibration value;
A control unit for receiving the vibration value detected by the vibration detection sensor unit 110 and controlling to display status information including the received vibration value and outputting a breaker control signal, a communication signal, and an alarm signal A control unit 120 for controlling the control unit 120;
A memory unit 130 for storing and managing the setting mode;
A display unit 140 displaying the status information under the control of the controller 120;
A communication unit 150 for transmitting / receiving a communication signal with an external device under the control of the control unit 120; And
A blocking signal generator 160 for outputting a trip signal to the breaker installed in the outer frame 10 under the control of the controller 120;
And,
In the setting mode,
And outputting a trip signal for opening the breaker when the detected vibration value exceeds the set vibration value, and outputting an alarm signal when the detected vibration value falls within a range of 80 to 100% 1 mode;
A second mode for outputting an alarm signal when the number of times that the detected vibration value falls within a range of 75 to 79% of the set vibration value is accumulated five times;
A third mode for outputting an alarm signal when the number of times that the detected vibration value falls within a range of 30 to 74% of the set vibration value is accumulated 30 times for a predetermined time;
A fourth mode for outputting an alarm signal when the cumulative integrated value for the set acceleration exceeds 10 times the set vibration value; And
A fifth mode for outputting an alarm signal when the cumulative integrated value for the set acceleration exceeds the set vibration value within a set period of time;
Lt; / RTI >
The vibration sensing device (100)
And a current sensing unit 190 installed on a secondary side of the circuit breaker and detecting a current,
Wherein the control unit (120) stops the operation of the vibration detection sensor unit (110) when there is no current detected by the current detection sensor unit (190).
delete delete The method according to claim 1,
Wherein the set vibration value is an earthquake scale of 6.3 to 7.0 and the set acceleration is 0.2 g to 0.3 g.
delete

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