KR20200014118A - Power Distribution Board with Fault Fiagnosis Function - Google Patents

Abstract

The present invention relates to a distribution board with an abnormality diagnosis function and, more specifically, to a distribution board which uses resistance by mechanical distortion caused by a temperature increase of a busbar installed in a distribution board and/or uses a reference value for an ambient temperature and a three-phase current temperature in the distribution board to monitor the safety of connection of each phase to protect power distribution equipment. According to embodiments of the present invention, the distribution board with an abnormality diagnosis function comprises: a distortion sensor to measure resistance by mechanical distortion caused by a temperature of a busbar of each phase (R-phase, S-phase, and T-phase) of three-phase alternating current power in a distribution board; a control unit to calculate a change of the resistance to compare the change of the resistance with a first reference value to determine whether an abnormality is present to output a control signal; an alarm means to notify an abnormality of the distribution board by a sound or light by the control signal of the control unit; and a manager terminal possessed by a manager of the distribution board to receive an abnormality message of the distribution board from the control unit.

Description

Power distribution board with fault diagnosis {Power Distribution Board with Fault Fiagnosis Function}

The present invention relates to a switchgear having an abnormal diagnosis function, and more particularly, reference values for the use of resistance due to mechanical distortion and / or the ambient temperature and the three-phase current temperature inside the switchgear. It relates to a switchgear that can protect the switchgear installation by monitoring the safety of the connection of each phase by using.

In general, the switchgear facility is a power supply device that supplies the power required for apartments, buildings, schools, factories, ports, etc. by converting extra high pressure to low pressure.

In the switchgear, the special high voltage power supplied from the substation is stepped down to the commercial voltage and supplied to the customer, where numerous wirings and electrical devices are installed and the current of the high voltage or voltage flows, resulting in an electric accident or fire.

In the switchgear, the temperature is especially important. In the loosened conductor connection area, when the contact resistance increases and the current flows through the increased resistance, the temperature rises at the conductor connection area due to heat generation, resulting in a fire.

The temperature rise due to the looseness of these contact areas is very dangerous because it leads to ultraviolet radiation, arc discharge, and fire inside the switchboard.

A general way of detecting such a risk is to measure the temperature inside the switchboard. For example, Korean Patent Publication No. 10-2010-0025937 (hereinafter referred to as 'prior art 1') uses a temperature sensing inside the switchboard. Since the technique which detects a danger is disclosed beforehand, it is comprised so that abnormal state of a switchboard may be judged by the temperature rise inside a switchboard.

However, the prior art 1 has a problem that it is difficult to determine the exact position of the occurrence of the abnormal condition because it determines the abnormal state by the overall temperature inside the switchboard, and also it is not possible to accurately determine the abnormal state because it determines the abnormality only by the entire temperature inside the switchboard.

For example, when the current value is low, the temperature fluctuation value compared to the ambient temperature is detected as the temperature value of the ambient temperature, and when a large amount of current flows using a large load, the temperature increases in proportion to the current value used in addition to the ambient temperature. Done.

However, when the abnormal state is judged only by the temperature, such a current value is not reflected, and thus a misdiagnosis may occur.

In addition, Republic of Korea Patent No. 10-1520758 (hereinafter referred to as 'prior art 2') has a change in time per hour of the amount of deduction of the temperature detected outside the switchboard from the temperature detected by one or more conductors inside the switchboard at a predetermined time. When the amount of change in the conduction current detected by the above conductor exceeds the predetermined threshold change amount or more, the abnormal state is analyzed to take action.

However, heat generated in a conductor is detected differently even if the same current flows according to the size and capacity of each conductor, material, and quality of power (high frequency, etc.) used.

In addition, when a small current flows, the temperature of the conductor is detected to be close to the ambient temperature inside the switchboard.

In general, the electricity we use is repeatedly operated and stopped, and when a large amount of current is being supplied, the ambient temperature inside the switchboard is detected to be higher than the outside temperature of the switchboard, and the current is supplied within the rated current value of the conductor. Even if a large amount of current is energized with a change in current instead of constant flow, the amount of change in the temperature of the conductor to be detected is proportional to the amount of change in the current value of the conductor to be detected.

In this case, the temperature fluctuation value of the conductor to be detected cannot exceed the amount of change in the current of the conductor to be detected, but the temperature inside the switchboard may rise to a temperature that may cause deterioration of internal equipment and wiring, but it may output a signal in an abnormal state. There is no limit.

Prior art 2 responds to the determination of an abnormal state of a switchboard when the change in temperature in a predetermined time period exceeds the change in current over a predetermined threshold change amount. There is.

In addition, the prior art 2 has a limitation in applying a change in the internal ambient temperature of the switchboard only to measure the temperature detected by the conductor inside the switchboard as the amount of change deducted by detecting the outside temperature of the switchboard.

Republic of Korea Patent Publication No. 10-2010-0025937 (published March 10, 2010) Republic of Korea Patent No. 10-1520758 (announced on May 18, 2015)

The present invention has been made to solve the above problems, it is possible to more accurately monitor the safety of the connection of each phase by diagnosing the abnormal state by using the changed resistance caused by the mechanical distortion caused by the rise of the temperature of the busbar installed inside the switchgear. In addition, it is possible to prevent the deterioration of the internal equipment of the switchboard by outputting an alarm signal by setting the upper limit of the resistance, and when the resistance reaches the resistance of the temperature at the time of fire, by spraying a fire extinguishing agent provided in the switchboard The purpose is to provide a switchgear with an abnormal diagnosis function that can suppress the early.

In addition, another object of the present invention is the current of the current transformer and the switch primary for the detection of the current in the conductor of each phase of the three phases to monitor the abnormal state in the temperature fluctuation value of the ambient temperature or more inside the switchboard detected by the temperature sensor inside the switchgear. A primary side temperature sensor for detecting the temperature of the conductors of the phases and a secondary side temperature sensor for detecting the temperature of the conductors of the secondary phases of the switchgear are provided. It is possible to monitor the safety of the connection of each phase more accurately by calculating the standard of temperature fluctuation value compared to current and diagnosing abnormal condition by comparing the normal operation condition suitable for the situation of the switchboard itself. It monitors all the conductor connections on the primary side with the switch and diagnoses the abnormality more precisely to detect alarms and alarm signals. It also outputs an alarm signal by setting an upper limit value for the temperature detected by the temperature sensor to prevent deterioration of internal equipment of the switchboard, thereby protecting the safety of the conductor connection more accurately and protecting the switchboard equipment from deterioration. The present invention provides a switchgear having an abnormal diagnosis function.

The switchgear having an abnormal diagnosis function according to an embodiment of the present invention for achieving the above object, the mechanical distortion according to the busbar temperature of each phase (R phase, S phase, T phase) of the three-phase AC power supply inside the switchboard. Distortion sensor for measuring the resistance through;

A control unit which calculates a change value of the resistance and compares it with a first reference value to determine whether it is abnormal and outputs a control signal;

Alarm means for notifying abnormality of switchboard by sound or light by a control signal of the controller; And

A manager terminal which is received by the manager of the switchboard and receives an abnormal message of the switchboard from the controller;

It includes.

In addition, the current detection unit consisting of a current transformer for measuring the current of each phase (R phase, S phase, T phase) flowing into the switchgear, the temperature sensor for measuring the temperature of each phase and the ambient temperature inside the switchgear Further provided with a temperature detection unit consisting of a temperature sensor to measure,

The controller compares the current and temperature of each phase output from the current detector and the temperature detector in a one-to-one manner, and calculates a temperature variation value (temperature-ambient temperature of each phase) compared to the current, and compares it with a second reference value to determine whether there is an abnormality. It is characterized by outputting a control signal by judging.

The controller may set three first reference values and two second reference values according to sizes, and determine the abnormality level as three levels of attention level, warning level, and high risk level.

The controller may determine whether the resistance change value of any one of the three phases and the temperature change value of the current of any one phase are greater than any one of the first reference value and the second reference value.

In addition, the control unit controls the switch to cut off the power supplied to the load when it is determined that the abnormality of the high risk degree, the temperature detected by the temperature detector reaches the temperature in the fire, or the resistance detected by the distortion sensor is the temperature in the fire When the resistance of the extinguishing agent is characterized in that the spray.

In addition, the temperature sensor for measuring the temperature of each phase, respectively, is a non-contact temperature sensor in consideration of safety, characterized in that the infrared temperature sensor.

And the distortion sensor is provided with a frame to transmit the mechanical distortion (twisting) of the busbar on both sides of the busbar in the longitudinal direction, between the frame of the both sides is connected to the elastic body that is deformed by moving like a frame, the elastic body inside A thin rod or film made of conductive material acts as a torsion gauge

The resistance is measured by drawing the resistance change of the torsion gauge as an electric signal using a bridge circuit.

According to the above-mentioned means for solving the problem, the safety of the connection of each phase can be more accurately monitored by diagnosing an abnormal state using the changed resistance caused by the mechanical distortion caused by the rise of the temperature of the busbar installed in the switchboard. By setting the upper limit for the alarm signal, it is possible to prevent the deterioration of equipment inside the switchboard in advance.If the resistance reaches the temperature resistance during the fire, the fire can be suppressed early by spraying the extinguishing agent provided in the switchboard. Can be.

In addition, in order to monitor the abnormal state at the temperature fluctuation value higher than the ambient temperature inside the switchboard, which is detected by the temperature sensor inside the switchboard, the current detection of the current in the conductors of each of the three phases and the temperature detection of the conductors of each phase of the primary switch A secondary temperature sensor for detecting the temperature of each phase of the secondary phase of the switch and a secondary side temperature sensor for the phase of the phase change of the current of each phase of the three phases Calculate the standard and compare the normal operation state suitable for the situation of the switchboard itself with the small current flow or large current flow, and diagnose the abnormal condition, so that the safety of connection of each phase can be monitored more accurately. All conductors connected to the vehicle side are monitored to diagnose more accurate abnormalities and output alarms and alarm signals. By setting an upper limit on the temperature detected by the sensor and outputting an alarm signal to prevent deterioration of equipment inside the switchboard, it is possible to protect the safety of the conductor connection more accurately and protect the switchboard equipment from deterioration.

1 is a block diagram showing a switchgear having an abnormal diagnosis function according to an embodiment of the present invention.
FIG. 2 is an internal configuration diagram of the control unit shown in FIG. 1.
FIG. 3 is a flowchart illustrating an example of a method for diagnosing abnormality of a switchgear shown in FIG. 1.
4 is a diagram illustrating an installation example of the distortion sensor illustrated in FIG. 1.

First, for the understanding of the present invention will be described for the current and temperature inside the switchgear.

It occurs when the connection part of the switchgear becomes loose due to defects in the manufacturing process of the switchgear, connection failure during construction, or vibration caused by vibration or earthquake during use. Safety accidents can be prevented in advance.

In each phase, a constant current flows when electricity is used, and the temperature of the bus is also changed in proportion to the amount of current used by the surrounding conditions or the capacity of the bus.

In this case, the temperature deviation of each phase is also proportionally detected based on the ambient temperature by the deviation of the current value of each phase.

In other words, if the current value is low, the temperature value of the ambient temperature is detected when the current value is low.However, when a large amount of current flows using a large load, the temperature increases in proportion to the current value used in addition to the ambient temperature. do.

Therefore, the temperature deviation of each phase is also detected in proportion to the deviation of the current value of each phase.

However, when the bus or branch connection of any phase is loosened, the temperature of the phase in question becomes higher than the deviation of the current value of each phase.

Using this principle of the present invention, the safety of the connection of each phase by the three-phase current and the temperature of the three-phase is sensed to protect the water distribution facility.

Hereinafter, the configuration and operation of the present invention will be described with reference to the accompanying drawings.

It should be noted that the same elements among the drawings are denoted by the same reference numerals and symbols as much as possible even though they are shown in different drawings.

In the following description of the present invention, detailed descriptions of related known functions or configurations will be omitted when it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention.

In addition, when a part is said to "include" a certain component, this means that it may further include other components, except to exclude other components unless otherwise stated.

1 is a block diagram showing a switchgear having an abnormal diagnosis function according to an embodiment of the present invention.

As shown in FIG. 1, the switchboard 100 having an abnormal diagnosis function according to an exemplary embodiment of the present invention includes a current detector 120, a temperature detector 130, a controller (controller) 110, a manager terminal 140, Alarm means 150, the switch 160, the display unit 170, the distortion sensor 180 and the extinguishing agent 190 is configured to include.

The current detector 120 is a current sensor for measuring a tracking current generated in the live line of the switchgear, and is composed of three-phase AC power supplies, that is, current transformers 121, 122, and 123, respectively. .

The current value of each phase measured by the current detector 120 is converted into a digital signal and output to the controller 110.

The temperature detector 130 includes a three-phase AC power source, that is, temperature sensors 131, 132, and 133 for detecting temperatures of R, S, and T phases, and an ambient temperature sensor 134 for detecting an ambient temperature inside the switchboard.

At this time, the upper limit value for the temperature detected by each temperature sensor (131, 132, 133, 134) is set in the controller 110, and the controller 110 outputs an abnormal signal through the alarm means 150 or the display unit 170 when the detected temperature is higher than the upper limit. can do.

In addition, each phase temperature sensor (131, 132, 133) is preferable to install a non-contact temperature sensor in each phase in consideration of safety, each phase temperature sensor (131, 132, 133) may be installed on the primary side and the secondary side of the switch.

As the non-contact temperature sensor, an infrared temperature sensor can be used, and in case of an electrical accident, especially a high pressure, a predetermined interval is installed.

 Here, the primary side of the switch is the inlet point of the main breaker of each switchgear such as VCB, ACB, MCCB, etc., and the secondary side is the secondary side of the main circuit breaker (main bus to which the load is connected).

This measures the primary and secondary temperature of the switchgear to determine if there is a problem with the primary circuit breaker's primary connection or with the primary line or with the secondary side.

On the other hand, the capacity of the conductor used in the switchgear 100 is from 100A to as much as 3000A or more bar, the current must flow at least 30% or more of the allowable current value of the conductor to increase the temperature of the conductor.

For example, when the bus capacity of the switchgear is about 150A and the current value of each bus is measured, the R phase is about 2 ~ 5A, the S phase is about 16 ~ 20A, and the T phase is about 2 ~ 5A similar to the R phase. If the ambient temperature is about 25.1 ° C, the temperature of the conductor of each phase is also detected similar to the ambient temperature inside the switchgear.

Therefore, in the end, when the current exceeds the ambient temperature inside the switchgear, the temperature difference of each phase occurs according to the amount of current used. Since the capacity of the conductor varies depending on the switchgear, it is difficult to set the reference value only by the deviation of the constant current value. In this case, the difference between the temperature fluctuations with respect to the current value of one-to-one in each phase should be taken as a reference value to determine whether an abnormality is present.

For example, if the capacity of the conductor is 2000A, the temperature of 2 ~ 300A does not have a big influence on the temperature of the conductor. However, the longer the time that 1000A flows and continuously energizes, the temperature is affected.

Here, depending on the type of load, for example, heating and cooling automatically repeats the ON / OFF by the temperature, each time the fluctuation of the current can be said to be as large as the size of the current, but the temperature of the conductor does not rise or fall as much as the fluctuation of the current.

If the capacity of the conductor is 200A, the current fluctuation range is within 200A, but if the capacity of the conductor is 2000A, the maximum fluctuation occurs up to 70% (1400 ~ 1500A) of the maximum usage. Fluctuates.

As a result, by measuring the current and temperature of each phase of the three phases, it is possible to set a reference value for the temperature change of the current compared to the normal operation according to the characteristics of the switchgear, it is determined that it is abnormal.

In this case, the reference value may be determined in several stages, and the degree of abnormality may be determined as caution, warning, or high risk when the reference value is exceeded.

The temperature of each phase measured by the temperature detector 130 is converted into a digital signal and output to the controller 110.

The controller 110 calculates a change value (temperature-ambient temperature of each phase) with respect to the current and the temperature of each phase output from the current detector 120 and the temperature detector 130.

Subsequently, the control unit 110 compares the change value (temperature-ambient temperature) of the temperature with respect to the current of each phase with a step-by-step reference value to diagnose whether each phase is abnormal.

In addition, the control unit 110 controls the alarm means 150 or the switch 160 in accordance with the determined degree of the switchgear and transmits a message to the manager terminal 140.

For example, when it is determined that the controller 110 has an abnormality of the attention level, the controller 110 controls the alarm unit 150 to output a warning sound, or lights or flashes a yellow warning lamp, for example, an abnormality of the switchboard and a warning message ( SMS is generated and transmitted to the manager terminal 140.

In addition, when the controller 110 determines that the warning degree is abnormal, the alarm means 150 controls the alarm sound or outputs a warning sound or lights or flashes a red warning lamp, for example, an abnormality of the switchboard and a warning message (SMS). It generates and transmits to the manager terminal 140.

In addition, when it is determined that the controller 110 has an abnormality of a high risk level, the controller 110 immediately operates the switch 160 to cut off the power supply and transmits the cutoff action message to the manager terminal 140.

If the controller 110 determines that any one of the three phases is abnormal, the controller 110 controls the alarm means 150 or the switch 160 or transmits a message to the manager terminal 140.

The manager terminal 140 is a wireless terminal owned by the manager of the switchgear and receives an abnormal state of the switchgear, such as a warning message or a warning message, from the controller 110 through wireless communication.

As the switchboard management application is installed in the manager terminal 140, the manager terminal 140 may be configured as a smart phone, a PDA, etc. in which the switchboard management application may be installed.

Here, the switchboard management application may be made of software that can be installed and operated in an operating system, such as Android (android) or iOS (iOS).

Accordingly, the manager may check the abnormal state of the switchboard through the manager terminal 140 and take action.

The alarm means 150 may include a speaker for outputting sound (sound) or a lamp for lighting or flashing light, and outputs or lights or flashes sound differently depending on the degree of abnormality.

Switch 160 is to supply or cut off the commercial AC power input to each customer in the switchgear, it is opened and closed by the control of the control unit 110 or manual operation.

The display unit 170 displays the state of the switchgear under the control of the controller, for example, the temperature (primary side temperature, secondary side temperature) of each phase, the current, the temperature fluctuation value compared to the current, the resistance, the presence of abnormality, and the like. And so on.

The distortion sensor 180 may be installed to be close to the busbar installed inside the switchgear, for example.

The busbar electrically connects the main breaker and the circuit breaker, and includes a plurality of busbar busbars connected to the main circuit breaker and branch busbars of the circuit breaker for electrically connecting the circuit breaker and the busbar busbars.

At this time, the main busbar is vertically installed at the output terminal of the main breaker to which the main busbar receiving power from the transformer is connected, and the plurality of branch busbars are installed in the orthogonal state in the horizontal direction.

 Distribution breakers are respectively provided at ends of the branch busbars, and loads are respectively connected to the output terminals of the circuit breakers.

In particular, in the present invention, the busbar is made of a material that causes mechanical distortion (torsion) according to the change of temperature, and the distortion sensor measures the resistance using the mechanical distortion (torsion) of the busbar.

For example, as shown in FIG. 4, the frame 182 is provided in close proximity to the busbar 181 so as to transmit mechanical distortion (torsion) of the busbar 181 on both sides in the longitudinal direction of the busbar 181. The elastic body 184 is moved between the frame 182 on both sides to deform and move together with the two frames 180. A torsion gauge 185 is provided with a thin rod or film of conductive material inside the elastic body 184. Play a role.

The resistance is measured by drawing the resistance change of the torsion gauge 185 as an electrical signal using the bridge circuit 186.

This resistance is indirectly measured by the temperature inside the switchgear in proportion to the temperature inside the switchgear.

Using this, resistance can be diagnosed step by step whether or not each phase is abnormal by comparing the step-by-step reference value similarly to the fluctuation value of the temperature versus the current of each phase.

Reference numeral 183 denotes a bracket for installing the elastic bodies 184 on both frames 182.

Subsequently, in FIG. 1, the extinguishing agent 190 is provided inside the switchgear to extinguish the fire by spraying the extinguishing agent under the control of the controller 110. For example, the nucleus may be a phase change material. Is composed of two or more halogen carbons, and the shell surrounding the nucleus has a microcapsule shape composed of a polymer material composed of a polymer linkage.

Particularly, in the present invention, when the temperature detected by the temperature detector 130 reaches a temperature in a fire or when the resistance detected by the distortion sensor 180 reaches a resistance of a temperature in a fire, the controller 110 determines that the fire is extinguished. Fire is initially suppressed by spraying the chemicals 190.

The switchgear 100 configured as described above may be provided with a seismic isolation function to ensure seismic safety by absorbing, reducing and extinguishing the seismic force transmitted to the switchgear when an earthquake occurs.

For example, a buffering ball bearing part may be installed at the lower part of the main switchgear body disclosed in Korean Patent No. 10-1749152, filed with the applicant, and at the same time, a vibration isolation support part may be installed between the buffer ball bearing part.

Thus, even if the main body of the switchgear is shaken up, down, left and right by the vibration of the earthquake, the separation of the switchgear main body is prevented by the variable position holding part of the base isolation bearing, and the buffer ball bearing unit returns the switchgear main body to its original position. The vibration caused by the vibration is eliminated and the main body of the switchgear can be safely protected by an earthquake.

In addition, when the connection part of the three phases provided inside the main body of the switchboard is loose due to the vibration caused by the earthquake, it is possible to know whether the abnormality is determined by the temperature variation value or the resistance change value of each phase, thereby protecting the switchboard equipment.

FIG. 2 is an internal configuration diagram of the controller (controller) shown in FIG. 1.

As shown in FIG. 2, the control unit (controller) 110 includes a power supply unit 111, a microcomputer 112, a storage unit 113, a manual operation unit 114, a communication unit 115, and a driving unit 116. do.

The communication unit 115 performs a function of transmitting a warning, warning, or blocking action message output from the microcomputer 112 to the manager terminal 140 in which a switchboard management application is installed through a communication network. The terminal 140 transmits a message.

The storage unit 113 has a step-by-step (by degree) reference value and identification code information (for example, phone number, name, job title, etc.) serving as a criterion for determining whether the switchboard is abnormal in the microcomputer 112. Storage management.

Here, when one administrator manages a plurality of switchboards, the storage unit 113 may store and manage IDs corresponding to the switchboards, and the ID may be included in the caution, warning, or blocking action message. Can be configured to be transmitted.

The manual operation unit 114 inputs a set value (reference value) according to the operation and operation of the control unit 110 by the administrator, and manually copes with the situation according to the switchboard abnormality determination.

The driver 116 receives various control signals output from the microcomputer 112 and drives the notification means 150, the switch 160, the display unit 170, and the extinguishing agent 190.

The power supply 111 supplies power for the operation of the above components.

The microcomputer 112 is demonstrated by the flowchart of FIG. 3 mentioned later.

FIG. 3 is a flowchart illustrating an example of a method for diagnosing abnormality of a switchgear shown in FIG. 1.

First, the current transformers 121, 122, and 123 of the current detector 120 measure a current of three-phase AC power flowing from the outside, that is, R phase, S phase, and T phase, respectively, and output the current to the microcomputer 112 (S30).

Next, the temperature sensors 131, 132, 133, and 134 of the temperature detector 130 measure the temperature of the three-phase AC power source introduced from the outside, that is, the R phase, the S phase, the T phase, and the ambient temperature inside the switchboard, respectively, and output the results to the microcomputer 112 ( S31).

Next, the distortion sensor 180 measures resistance through mechanical distortion according to the temperatures of the R phase, S phase, and T phase busbars.

This resistance can indirectly determine the temperatures of the R, S and T phase busbars.

The microcomputer 112 compares the current and the temperature of each phase one-to-one to calculate a temperature variation value (temperature-ambient temperature of each phase) or a resistance change value (S32).

The microcomputer 112 compares the temperature change value or the resistance change value with respect to the current for each phase with the first reference value (stored in the storage unit) having the smallest value among the stepwise reference values to determine whether the degree of attention is abnormal (S34). .

The microcomputer 112 determines that the temperature variation value or the resistance change value of each phase current is greater than the first reference value, and thus outputs a control signal to the driving unit 116 to alert the user through the alarm means 150. Is issued, a warning message is generated and transmitted to the manager terminal 140 through the communication unit 115 (S35).

Here, in any of the three phases, if the temperature change value or the resistance change value of the current is greater than the first reference value, it is determined that the degree of attention is abnormal, and the manager who checks the caution message through the manager terminal 140 goes to the switchboard. By moving, the manual control unit 114 is operated to take safety measures.

Next, the microcomputer 112 compares the temperature fluctuation value or the resistance change value with respect to the current of each phase again to a second reference value (stored in the storage unit) whose value is intermediate among the stepwise reference values to determine whether the warning level is abnormal ( S36).

The microcomputer 112 determines that the temperature variation value or the resistance change value of each phase current is greater than the second reference value, and thus outputs a control signal to the driving unit 116 to warn the user through the alarm means 150. Is issued, generates a warning message and transmits to the manager terminal 140 through the communication unit 115 (S37).

Here, if any one of the three phases temperature change value or resistance change value compared to the current is greater than the second reference value, it is determined that the abnormality of the warning degree, and the administrator who checks the warning message through the manager terminal 140 to the place where the switchboard is located. By moving, the manual control unit 114 is operated to take safety measures.

In addition, the microcomputer 112 compares the temperature variation value or the resistance change value with respect to the current of each phase with a third reference value (stored in the storage unit) having the largest value among the stepwise reference values to determine whether the high risk degree is abnormal (S38). ).

The microcomputer 112 determines that the temperature change value or the resistance change value of each phase is greater than a third reference value, and thus outputs a control signal to the driving unit 116 to operate the switch 160. The power is cut off, and a message for the blocking action is generated and transmitted to the manager terminal 140 through the communication unit 115 (S39).

Here, if any one of the three phases temperature change value or resistance change value compared to the current is greater than the third reference value, it is determined that the abnormality of the high-risk degree, and the administrator who checks the blocking action message through the manager terminal 140 is where the switchboard is located. After moving to take safety measures to operate the switchgear 160 again to supply power.

The microcomputer detects that the temperature detected by the temperature detector 130 reaches a temperature (stored in a storage unit) in a fire or the resistance detected by the distortion sensor 180 reaches a resistance (stored in a storage unit) of a temperature in a fire. In the case of extinguishing the fire extinguishing agent 190, the fire is initially suppressed.

Although the technical spirit of the present invention has been described above with reference to the accompanying drawings, the present invention has been described by way of example and is not intended to limit the present invention.

In addition, it is obvious that any person skilled in the art may make various modifications and imitations without departing from the scope of the technical idea of the present invention.

100: switchboard 110: control unit
120: current detector 130: temperature detector
140: manager terminal 150: alarm means
160: switch 170: display unit
180: distortion sensor 190: extinguishing agent

Claims (7)

Distortion sensor for measuring the resistance through mechanical distortion according to the busbar temperature of each phase (R phase, S phase, T phase) of the three-phase AC power supply inside the switchboard;
A control unit which calculates a change value of the resistance and compares it with a first reference value to determine whether it is abnormal and outputs a control signal;
Alarm means for notifying abnormality of switchboard by sound or light by a control signal of the controller; And
A manager terminal which is received by the manager of the switchboard and receives an abnormal message of the switchboard from the controller;
Switchgear having an abnormal diagnosis function comprising a. The method of claim 1,
A current detector comprising a current transformer for measuring the current of each phase (R phase, S phase, T phase) flowing into the switchgear, and a temperature sensor for measuring the temperature of each phase and the ambient temperature inside the switchgear Further provided with a temperature detection unit consisting of a temperature sensor,
The controller compares the current and temperature of each phase output from the current detector and the temperature detector in a one-to-one manner, and calculates a temperature variation value (temperature-ambient temperature of each phase) compared to the current, and compares it with a second reference value to determine whether there is an abnormality. A switchgear having an abnormal diagnosis function, characterized in that for outputting a control signal by judging. The method of claim 2,
And the control unit sets the first reference value and the second reference value according to the size of the three switchboards having an abnormality diagnosis function, characterized in that the degree of abnormality is determined by three levels of attention, warning, and high risk. The method of claim 3,
The control unit determines whether the change in the resistance of any one of the three phases and the temperature fluctuation value of the current of any one of the phases is greater than any one of the first reference value and the second reference value. . The method of claim 3,
The control unit controls the switch to cut off the power supplied to the load when it determines that the abnormality of the high risk degree, the temperature detected by the temperature detector reaches the temperature in the fire, or the resistance detected by the distortion sensor is the resistance of the temperature in the fire Switchgear having an abnormal diagnosis function, characterized in that the injection of a fire extinguishing agent when reached. The method of claim 1,
The temperature sensor for measuring the temperature of each phase, respectively, is a non-contact temperature sensor in consideration of safety, the switchgear having an abnormal diagnosis function, characterized in that the infrared temperature sensor. The method of claim 1,
The distortion sensor is provided with a frame to transmit the mechanical distortion (twisting) of the busbar on both sides of the busbar in the longitudinal direction, between the frame of the both sides is connected to the elastic body that is deformed by moving like a frame, inside the elastic body Conductive thin film or film acts as a torsion gauge
And a switchgear having an abnormal diagnosis function, wherein the resistance is measured by drawing a resistance change of the torsion gauge as an electric signal using a bridge circuit.

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