KR101422797B1 - Electric motor control board based on powerless temperature sensor - Google Patents

Abstract

The present invention relates to an electric motor control board and, more particularly, to an electric motor control board having bus bar temperature and fire expectation monitoring functions. The electric motor control board having bus bar temperature and fire expectation monitoring functions according to an embodiment of the present invention includes: an arc monitoring module to monitor arc generated from the electric motor control board; and a temperature monitoring module to determine whether a temperature of at least one of R, S, and T shape bus bars is equal to or greater than a preset upper limit and is continuously increased, to determine whether a current of the bus bar with the temperature equal to or greater than a preset upper limit and continuously increased is continuously increased when the temperature of at least one of R, S, and T shape bus bars is equal to or greater than the preset upper limit and is continuously increased, to determine that temperature increase in the bus bar with the temperature equal to or greater than a preset upper limit and continuously increased is achieved by an excessive current when the current of the bus bar is continuously increased, and to determine the temperature increase in the bus bar with the temperature equal to or greater than a preset upper limit and continuously increased is achieved by a physical defect when the current of the bus bar is continuously not increased.

Description

ELECTRIC MOTOR CONTROL BOARD BASED ON POWERLESS TEMPERATURE SENSOR <br> <br> <br> Patents - stay tuned to the technology ELECTRIC MOTOR CONTROL BOARD BASED ON POWERLESS TEMPERATURE SENSOR

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor control panel, and more particularly, to a motor control panel having a temperature monitoring function of a booth bar and a fire prevention monitoring function based on a non-power temperature sensor.

The motor control panel is equipped with various kinds of circuit breakers in the enclosure to draw electric power from the outside to distribute the electric power, and to selectively supply the electric power to the motor. The motor control board basically includes a busbar that is powered via the main breaker. Then, the electric power branched from the booth bar is supplied to the electric motor through the branch circuit breaker. The busbar is fixed by bolts, and when the bolt is loosened, the resistance between the bolt and the busbar increases, resulting in overheating. This can damage the bus bar or cause a fire in the motor control panel. Or, even if the busbar is stably fixed by the bolt, if the busbar is exposed to the overcurrent for a long time, a fire due to the overcurrent may occur. In the case of image harmonics, it is superimposed on N phase to have amplitude three times. Therefore, fire due to image harmonics may occur in the N-phase busbar. Also, the N-phase bus bar can be overheated by the three-phase unbalanced current. Such a variety of causes may cause accidents due to overheating of the busbar. Therefore, it is necessary for the manager of the motor control panel to monitor the overheating of the bus bar and to precisely understand the cause of the overheating and prepare for the overheating. Also, in case of the N-phase bus bar, the image harmonics on the N-phase bus bar must be monitored from time to time in order to prevent overheating due to image harmonics.

And, according to recent data, about 80% of all electric fire causes are caused by arc. The arc in the low-voltage distribution system causes heat to be generated on the wire sheath or the contact surface, which ultimately causes a fire.

Therefore, it is necessary to predict the fire by monitoring the arcing, which is a precursor of the fire in the motor control panel.

In this regard, Korean Patent No. 10-1197021 (high and low voltage switchgear with arc flash detection device, motor control panel, and distribution panel) is installed in each element of the motor control panel to detect occurrence of arc flash in the set range region It is possible to accurately detect the position and size of the arc flash and to completely prevent the noise from being mixed in a period during which the signal from the sensing device to the data collection board installed in the shielded area is transmitted. And a motor control panel.

Korean Patent Registration No. 10-1197021, however, has a problem in that it can not correctly distinguish between normal arc and faulty arc. Therefore, there is a problem that an unnecessary alarm may occur even for a normal arc.

1. Korean Registered Patent No. 10-1197021 (Published on October 29, 2012)

Accordingly, the present invention provides a motor control panel capable of monitoring the temperature of the bus bar and analyzing the cause of temperature increase based on the non-power temperature sensor.

The present invention is to provide an electric motor control panel capable of precisely predicting a fire by accurately discriminating an arc in a faulty state.

Other objects of the present invention will become readily apparent from the following description of the embodiments.

According to another aspect of the present invention, there is provided an electric motor control panel having a booth bar temperature and fire warning monitoring function, including an arc monitoring module for monitoring an arc generated in a motor control panel; And determining whether or not a temperature on at least one of the R, S, and T phase booth bars is higher than or equal to a preset upper temperature limit and if the booth bar is higher than the upper temperature limit and the temperature continuously increases, Determining whether or not the current on the bus bar continuously increasing in temperature above the upper temperature limit value is continuously increased; and if it is determined that the current continuously increases, the temperature rise of the bus bar in which the temperature is continuously increased, And if it is determined that it is not continuously increased, it includes a temperature monitoring module that determines that the temperature rise of the booth bar, which is above the upper temperature limit and continuously increases, is due to a physical defect.

Here, the temperature monitoring module may determine whether the temperature on the N-phase booth bar is equal to or higher than a preset upper temperature limit value. If it is determined that the temperature on the N-phase booth bar is equal to or higher than the predetermined upper temperature limit value, And determining that the image harmonics on the N-phase busbar are higher than the reference harmonic value if the N-phase busbar is judged to be less than the reference unbalance value, The booth bar is judged to have increased in temperature due to a physical defect, and when it is determined that the temperature is higher than the reference unbalance value, it can be determined that the temperature of the N-phase booster bar is increased due to the unbalance current.

The arc monitoring module recognizes that an arc has occurred when the light detected by the light detecting unit exceeds a preset critical light value, and detects an arc of a temperature on the R, S, T, N phase bus bars detected by the temperature detecting unit. It is recognized that a phase arc having the highest temperature at the time of occurrence is generated. Based on the current of the phase in which the arc occurs, the maximum value in one cycle of the current of the arc in which the arc occurred immediately before the arc is generated, It is judged that the arc is a normal arc when the difference between the maximum value and the maximum value in one cycle of the current exceeds the preset value and the maximum value in one cycle of the current of the arc in which the arc occurs immediately before the arc is generated, If the difference between the maximum values is less than or equal to the preset value, it can be determined that the arc is a failure arc.

The temperature monitoring module monitors the temperature of each of the R, S, T, and N phase booth bars using the temperature of each of the R, S, T, and N phase bus bars detected by the temperature detector, And the temperature of each of the R, S, and T phase bus bars is calculated by using the response signal of the non-power temperature sensor provided in each of the R, S, and T bus bars corresponding to the sensor call signal .

As described above, according to the present invention, it is possible to monitor the temperature of the booth bar and analyze the cause of temperature increase based on the non-power temperature sensor.

The present invention can accurately predict a fire by correctly discriminating an arc in a fault state.

1 shows a motor control panel according to a preferred embodiment of the present invention.
Figure 2 shows a functional block diagram of the monitoring device of Figure 1;
Figure 3 shows a functional block diagram of the temperature monitoring module of Figure 2;
4 is a flow chart illustrating an arc monitoring process of the arc monitoring module of FIG.
5 is a flowchart showing a temperature monitoring process of the first temperature monitoring unit of FIG.
6 is a flowchart showing a temperature monitoring process of the second temperature monitoring unit of FIG.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for like elements in describing each drawing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

And / or &lt; / RTI &gt; includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention.

The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, a motor control panel having a booth bar temperature and fire warning monitoring function according to a preferred embodiment of the present invention will be described with reference to FIGS. 1 to 6 attached hereto.

1 shows a motor control panel according to a preferred embodiment of the present invention. Figure 2 shows a functional block diagram of the monitoring device of Figure 1; Figure 3 shows a functional block diagram of the temperature monitoring module of Figure 2; 4 is a flow chart illustrating an arc monitoring process of the arc monitoring module of FIG. 5 is a flowchart showing a temperature monitoring process of the first temperature monitoring unit of FIG. 6 is a flowchart showing a temperature monitoring process of the second temperature monitoring unit of FIG. Hereinafter, in order to clarify the gist of the present invention, the description of the conventional matters will be omitted or simplified.

Referring to FIG. 1, an electric motor control panel may include a housing 1 and a monitoring device 100 fixed to an outer surface of the housing 1.

As is well known, an MCCB, a busbar, a surge protector, and the like may be installed inside the enclosure 1.

2, the monitoring apparatus 100 may include a light detecting unit 10, a temperature detecting unit 20, a current detecting unit 30, an arc monitoring module 110, and a temperature monitoring module 120.

The light detecting unit 10 can detect the light inside the enclosure 1. As is well known, light is emitted when an arc occurs. Therefore, the light detecting unit 10 can detect light corresponding to the arc through an optical sensor (not shown) provided inside the housing 1. [

The temperature detector 20 can detect and store the temperatures on the R, S, T, and N phase bus bars (not shown). The temperature detector 20 can detect and store the temperatures on the R, S, T, and N phase bus bars (not shown). To this end, the temperature detector 20 outputs a sensor calling signal of a radio frequency (for example, 3 * 10 ^ 8 m / s) to a temperature sensor provided on each of the R, S, T, and N phases, Can be collected from the temperature sensors installed in the respective RS, T and N phases, and the response signals can be analyzed to detect the temperature in each of the RS, T, and N phases. At this time, the temperature sensor provided on each of the R, S, T, and N phases may be a SAW non-power source sensor. The resonance frequency of the surface acoustic wave can be varied by the temperature of the SAW non-powered sensor. That is, when receiving the sensor calling signal of the radio frequency signal outputted by the temperature detecting unit 20, the temperature sensor outputs a response signal including the resonance frequency information that varies according to the temperature, and the temperature detecting unit 20 The temperature of each of the R, S, T, and N phase bus bars can be calculated by interpreting the included resonance frequency information. The operation principle of the SAW non-powered sensor for temperature detection is well-known, and a detailed description thereof will be omitted.

The current detection unit 30 can detect and store the current on the R, S, T, and N phase bus bars (not shown).

The arc monitoring module 110 recognizes occurrence of an arc with the light detected by the light detecting unit 10 and detects an arc generated in a steady state (for example, an arc generated by a switching operation, hereinafter referred to as & (Hereinafter referred to as " arc "), or an arc caused by a phenomenon of a frontal phenomenon of a fire (hereinafter referred to as a" fault arc ").

More specifically, referring to FIG. 4, the arc monitoring module 110 may recognize that an arc has occurred when the light detected through the light detecting unit 10 exceeds a preset critical light value (S41).

The arc monitoring module 110 can recognize that a phase arc having the highest temperature at the time of arc generation among the temperatures on the R, S, T, and N phase bus bars detected by the temperature detector 20 ( S42).

At this time, the arc monitoring module 110 can diagnose the arc based on the current of the arc-generated phase (S43). Specifically, the arc monitoring module 110 extracts the maximum value in one cycle of the current of the arc in which the arc occurs immediately before the arc is generated, and extracts the maximum value in one cycle of the current in the arc immediately after the arc disappearance. Here, immediately after the arc disappearance, it may mean a time point after the light is reduced to a critical light value or less after exceeding the critical light value. The arc monitoring module 110 calculates the difference between the maximum value in one cycle of the current in the phase of the arc immediately before the generation of the silver arc and the maximum value in one cycle of the current in the phase in which the arc occurs immediately after the arc disappearance , 1A), it can be judged that it is a normal arc. Alternatively, when the difference between the maximum value in one cycle of the current in the arc immediately before the arc is generated and the maximum value in one cycle of the current in the arc in which the arc occurs immediately after the arc disappearance is equal to or less than the preset value, . This is because when the difference between the maximum value in one cycle of the current in the arc immediately before the arc occurrence and the maximum value in one cycle of the current in the arc immediately after the arc disappearance is less than the preset value, As described above, the arc monitoring module 110 of the present invention accurately recognizes arc generation by light, accurately recognizes an arc-generated image using temperature, and can accurately distinguish a fault arc and a normal arc by using a phase current.

Referring to FIG. 3, the temperature monitoring module 120 monitors the temperatures on the R, S, T, and N busbars and analyzes the cause of the temperature rise. The temperature monitoring module 120 may include a first temperature monitoring unit 121 and a second temperature monitoring unit 122.

The first temperature monitoring unit 121 can diagnose the temperatures on the R, S, and T busbars using the temperature collected by the temperature detector 20 and the current values collected by the current detector 30. [ The specific operation of the first temperature monitoring unit 121 will be described with reference to FIG. For convenience of explanation, the diagnosis of the temperature of the R phase booth bar will be described as a reference. The process of Fig. 5 can also be applied to S phase and T phase bus bars in common.

Referring to FIG. 5, the first temperature monitoring unit 121 may determine whether the temperature on the R-phase booth bar is higher than a preset upper temperature limit and the temperature is continuously increased (S51). If it is determined in step S51 that the temperature on the R phase booth bar is lower than the upper temperature limit value or if the temperature is not continuously increasing, the first temperature monitoring unit 121 may terminate the temperature diagnosis on the R phase booth bar. Alternatively, if it is determined in step S51 that the temperature on the R-phase booth bar is equal to or higher than the upper temperature limit and the temperature is continuously increasing, the first temperature monitoring unit 121 may provide an alarm (S52). At this time, the identification information of the bus bar exceeding the upper temperature limit and continuously increasing in temperature and the temperature of the bus bar can be displayed. Alternatively, the booth bar identification information that has remotely exceeded the upper temperature limit value and the temperature of the booth bar may be provided. Here, whether or not the temperature continuously increases may mean that the temperature is increasing over a predetermined time in a state where the temperature is higher than the upper temperature limit value.

At this time, the first temperature monitoring unit 121 may determine whether the temperature rise of the bus bar is caused by an overcurrent (S53). To this end, the first temperature monitor 121 may determine whether the current on the R phase booster bar is continuously increasing. Here, whether or not the current is continuously increasing can be judged for a predetermined time period in which the temperature is recognized to be continuously increased. If it is determined in S53 that the current on the R phase booster bar has not increased for a predetermined period of time, the first temperature monitoring unit 121 determines that the overheating of the R phase booster bar is a physical defect, for example, (S55). On the other hand, if it is determined in S53 that the current on the R phase booth bar higher than the upper temperature limit has increased for a predetermined time, the first temperature monitor 121 can inform the outside that the overheating of the R phase booster bar is overheat due to the overcurrent (S54). As described above, according to the present invention, the temperature on the R, S, T phase booster bar is monitored and at the same time, whether the temperature increase on the R, S, T phase booster bar is caused by the overcurrent or by the loosening of the booster bar fixing bolt Can be determined.

3, the second temperature monitoring unit 121 uses the temperature collected by the temperature collecting unit 20 and the current collected by the current collecting unit 30 to diagnose the temperature on the N-phase booth bar can do. The specific operation of the second temperature monitoring unit 122 will be described with reference to FIG.

Referring to FIG. 6, the second temperature monitoring unit 122 may determine whether the temperature on the N-phase booth bar is equal to or higher than a predetermined upper temperature limit value (S61). If it is determined in S61 that the temperature is below the upper limit value, the temperature diagnosis procedure for the N-phase bus bar may be terminated. On the other hand, if it is determined in step S61 that the temperature on the N-phase booth bar is equal to or higher than the pre-set temperature upper limit value, the second temperature monitoring unit 122 may provide an alarm (S62). At this time, the temperature of the N-phase booth bar can be displayed. Alternatively, the temperature of the N phase booster bar may be provided remotely.

The second temperature monitoring unit 122 calculates the unbalanced current using the current values on the R-phase busbar, the S-phase busbar, and the T-phase busbar, and determines whether the calculated unbalanced current is equal to or greater than the reference unbalance value (S63). If it is determined in S63 that the current is less than the unbalanced current, the second temperature monitor 122 may determine whether the image harmonics on the N-phase busbar are greater than or equal to the reference harmonic value (S64). Here, the image harmonics on the N phase bus bar can be calculated using the current on the N phase bus bar. If it is determined in step S64 that the image harmonic is less than the reference harmonic value, the second temperature monitor 122 may inform the outside that the overheating of the N-phase bus bar is overheat due to a physical defect, for example, (S65). If it is determined in step S65 that the image harmonics are equal to or higher than the reference harmonic value, the second temperature monitor 122 may provide an alarm indicating that the image harmonics are overheated (S66). At this time, the second temperature monitoring unit 122 can record the image harmonic amount.

If it is determined in S63 that the current is equal to or higher than the unbalanced current, the second temperature monitoring unit 122 can inform the outside that it is overheated by the unbalanced current (S67). At this time, the second temperature monitoring unit 122 may record the R, S, and T current values used for calculating the unbalanced current.

As described above, the present invention can monitor the temperature of the N-phase bus bar and determine whether the N-phase bus bar temperature rise is due to the unbalanced current or the image harmonic.

It is needless to say that the processes of FIGS. 5 and 6 may be performed entirely or partially, or may be performed in different orders.

It will be apparent to those skilled in the relevant art that various modifications, additions and substitutions are possible, without departing from the spirit and scope of the invention as defined by the appended claims. The appended claims are to be considered as falling within the scope of the following claims.

1: Motor control board
10:
20:
30:
100: Monitoring device
110: arc monitoring module
120: Temperature monitoring module
121: first temperature monitoring section
122: second temperature monitoring unit

Claims (4)

1. A motor control panel having a booth bar temperature and fire prediction monitoring function,
An arc monitoring module for monitoring an arc occurring in the motor control panel; And
Determining whether or not the temperature on at least one of the R, S, and T phase busbars is greater than or equal to a preset upper temperature limit, and if the temperature is above the upper temperature limit and the temperature is continuously increasing, Determining whether or not the current on the bus bar continuously increasing in temperature above the upper limit value is continuously increased; and if it is determined that the current continuously increases, the temperature rise of the bus bar in which the temperature is continuously increased, And judging that the temperature rise of the booth bar, which is higher than the upper temperature limit and continuously increases, is judged to be due to a physical defect,
The arc monitoring module includes:
When the light detected through the light detecting unit exceeds a preset critical light value, it is recognized that an arc has occurred,
S, T, and N detected by the temperature detecting unit, it is recognized that a phase arc having the highest temperature at the time of arc generation is recognized,
Based on the current in the phase of the arc,
It is judged that the arc is a normal arc when the difference between the maximum value in one cycle of the current of the arc immediately before the arc is generated and the maximum value in one cycle of the current of the arc in which the arc occurs immediately after the arc disappearance exceeds the preset value, When the difference between the maximum value in one cycle of the current of the arc in which the arc occurs and the maximum value in one cycle of the current of the arc in which the arc occurs immediately after the arc disappearance is equal to or less than a predetermined value. The method according to claim 1,
The temperature monitoring module includes:
Determining whether the temperature of the N-phase booth bar is equal to or greater than a preset upper limit value; and determining whether the temperature of the N-phase booth bar is higher than a predetermined temperature upper limit value,
Wherein when the image harmonics on the N-phase booth bar is greater than or equal to the reference harmonic value, the N-phase booth bar determines that the temperature of the N-phase booth bar has risen due to the image harmonics and the image harmonics on the N- , The N-phase bus bar determines that the temperature has risen due to a physical defect,
And determines that the temperature of the N-phase busbar has risen due to the unbalanced current when it is determined to be equal to or greater than the reference unbalance value. delete The method according to claim 1,
The temperature monitoring module monitors the temperature of each of the R, S, T, and N phase bus bars using the temperature of each of the R, S, T, and N phase bus bars detected by the temperature detector,
The temperature detector outputs a sensor calling signal of a radio frequency,
Wherein the temperature of each of the R, S, and T phase bus bars is calculated using a response signal of a non-power source temperature sensor provided in each of the R, S, and T bus bars corresponding to the sensor calling signal.

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