KR101020038B1 - Motor control board with electrical fault detection - Google Patents

Abstract

Disclosed is a motor control panel having an electrical abnormal state detection function that enables early detection of an electrical fire due to a defective contact or an arc by detecting an electrical abnormality in a motor control panel.
Motor control panel having an electrical abnormal state detection function disclosed,
A detector for detecting a state value of power supplied to the motor in real time; A data converter for digitizing the state value of the power source detected by the detector and converting the power state data into power state data; Based on the power state data converted by the data converter, a detection algorithm for detecting an electrical contact failure and an arc is executed to detect an electrical contact failure and an arc of the motor control panel. And an electrical abnormal state detection device that generates and controls the interruption of power supplied to the motor.

Description

Motor control board for detecting electrical loose contact and arc

The present invention relates to a motor control having an electrical abnormal state detection function, and more particularly, it is possible to detect early signs of an electrical fire due to contact failure and arc through electrical abnormality detection in a motor control panel. The present invention relates to a motor control panel having an electrical abnormal state detection function.

Generally speaking, more than 30,000 fires occur every year, and about one third of them are known as electric fires, and electrical fires are frequent, especially in factories and large shopping malls. When an electrical fire occurs in a place where power is intensive, a fire prevention system has always been urgently needed because of the enormous damage to property and the loss of life. Here, about 65% or more of electric fires generated by electrical causes such as short circuits, poor contact, and arcs have been reported to the academic community.

Therefore, there is an urgent need for a fire prevention safety system that detects short circuits, contact failures, arcs, and the like early in power devices (particularly, switchboards) and blocks arcs.

On the other hand, an electric room provided in a building, a factory, or an apartment is provided with a closed switchgear for receiving high or special high voltage electricity supplied by a power company and distributing it to the load of each customer. Closed switchgear is divided into special high voltage plate, transformer panel, low voltage plate, motor control panel (MCC panel, motor control panel), and distribution panel according to the power supply sequence and voltage of power system. It consists of transformer transformer current transformer (MOF panel), transformer transformer panel (PT panel), and special high voltage cut-off foundation (VCB panel).

Here, the motor control panel (MCC panel) is a collection of medium and large starting devices and protection devices, and is an electrical facility that systematically constitutes a power supply in a building, and must act as a rational and systematic power distribution device, and loads In order to prevent the spread of equipment failures, thorough maintenance is usually required.

Such a conventional motor control panel is connected to an indoor fire hydrant main pump motor, an indoor fire hydrant auxiliary pump, an outdoor fire hydrant main pump, an outdoor fire hydrant auxiliary pump, a sprinkler main pump, a sprinkler auxiliary pump, a refrigeration-based heater, and an electric motor (motor) of a shower hot water heater. Thus, power supply and shutdown operation are performed.

However, such a conventional motor control panel does not have a big problem in motor control, power supply, or power cutoff operation, but has no function of detecting an electrical abnormal state (contact failure and arc), and thus it is possible to detect signs of an electric fire in advance. There were no drawbacks.

Therefore, the conventional motor control panel can not detect the signs of the electric fire in advance, there was a disadvantage that can not prevent the occurrence of a large fire due to the occurrence of an electrical abnormal condition.

Accordingly, the present invention is proposed to prevent the fire caused by the electricity in advance,

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a motor control panel having an electrical abnormal state detection function that enables early detection of an electrical fire caused by contact failure and arc through electrical abnormality detection in a motor control panel. .

Another problem to be solved by the present invention is to monitor in real time the arc (ARC), electrical contact failure, etc., which is the main cause of the electric fire in the motor control panel, if a sign of an electrical abnormality is found, take a quick diagnosis and recovery measures for the electrical abnormality The present invention provides a motor control panel equipped with an electrical abnormality detection function to prevent electrical fires in advance.

"Motor control panel with an electrical abnormal state detection function" according to the present invention for solving the above problems,

A detector for detecting a state value of power supplied to the motor in real time; A data converter for digitizing the state value of the power source detected by the detector and converting the power state data into power state data; Based on the power state data converted by the data converter, a detection algorithm for detecting an electrical contact failure and an arc of the motor control panel is executed to detect an electrical contact failure and an arc of the motor control panel, and an alarm for alarming when an abnormal state is determined. In the motor control panel having an electrical abnormal state detection function comprising an electrical abnormal state detection device for generating a control signal and controlling the interruption of the power supplied to the motor,

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The electrical abnormal state detection device,

A detection algorithm for detecting the electrical contact failure and arc detection based on the memory in which the power state data is stored and the data of the steady state waveforms for each motor type are stored, and the stored power state data and the steady state waveforms for each motor type. A digital signal processor (DSP) is executed to determine whether the motor is in an abnormal state.

According to the present invention, there is an advantage that early detection of an electrical fire due to a poor contact and an arc can be detected in advance by detecting an abnormal phenomenon of the motor control panel.

In addition, the motor control panel detects the arc signal generated on the electric line in real time to monitor the risk of fire on the electric line due to the arc generation, and in the event of an arc in the event of fire risk, immediate arc diagnosis and line recovery measures can be taken. By doing so, there is an advantage that can prevent the occurrence of electrical fire due to electrical contact failure or arc in advance.

1 is a configuration diagram of a motor control switchboard having an electrical abnormal state detection function according to the present invention.
2 is a configuration diagram of an embodiment of the electrical abnormal state detection device of FIG.
FIG. 3A is a waveform graph of a starting motor and a resistance load in a steady state, and FIG. 3B is a waveform graph of a starting motor and a resistance load at the time of contact failure and arc generation.
4a to 4f is a fuzzy rule table applied to the present invention.
5 is an explanatory diagram for explaining the determination of the electrical contact failure and arc detection of the motor control panel by the multi-faceted evaluation method in the present invention.

Hereinafter, described in detail with reference to the accompanying drawings a preferred embodiment of the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

1 is a block diagram showing the configuration of a motor control panel having an electrical abnormal state detection function according to the present invention, the detector 101, the motor 150 as a load, the data converter 110, the electrical abnormal state detection device 120 ), Alarm device 130, switchboard circuit breaker (MCCB) (161), magnetic switch (MG) (162), Electronic Overload Relays (EOCR: Electronic Overload Relays) (163), to automatically cut off the relay in case of overload LOP 164, remote control panel (CRT) 166 and motor control center (MCC) 165.

The detailed configuration and operation of the switchgear breaker 161, the magnetic switch 162, the electronic overload relay 163, the field operation panel 164, the remote control panel 166 and the motor control center 165, the configuration of the general motor control panel And since the operation is the same, detailed description of the corresponding part will be omitted below.

The detectors 101 to 103 are mounted at predetermined positions of power supply lines of three-phase AC power supplies R, S, and T supplied to the motor 150 serving as a load, and detect a current / voltage of each phase. It is preferable to use CT, ZCT and PT.

The data converter 110 performs a function of digitizing the state values of the power detected by the detectors 101 to 103 and converting them into power state data. Here, power state data is power quality information for each element, and means information such as power factor, harmonics, overcurrent, surge, and swell.

The electrical abnormal state detection device 120 detects an electrical contact failure and an arc by executing a detection algorithm for detecting electrical contact failure and arc of the motor control panel based on the power state data converted by the data converter 110. When it is determined that the state is generated an alarm control signal for alarming, and performs a function of controlling the interruption of the power supplied to the motor 150 as a load if necessary. Here, the power supply to the motor 150 may be cut off automatically or may be cut off by manual operation by an administrator.

As shown in FIG. 2, the electrical abnormal state detection device 120 stores the power state data, and stores the data about the waveform of the normal state for each motor type, and the stored power state data. Based on the waveform of the steady state, the detection algorithm for detecting the electrical contact failure and the arc is executed to determine whether there is an abnormal state, and to display the result of the determination or to generate an alarm signal when the power state data is displayed and when an abnormal state occurs. A digital signal processor (DSP) 122, a liquid crystal display (LCD) 123 for displaying power quality according to a display signal generated by the digital signal processor 122, and a real time clock (RTC) generator for providing a real time driving clock ( 124) and the like.

The alarm device 130 may generate an alarm in response to the alarm signal generated by the electrical abnormal state detection device 120 or notify a remote manager or control system of electric contact failure and arc detection.

Referring to Figures 1 to 5 attached to the operation of the motor control panel having an electrical abnormal state detection function configured as described above in detail as follows.

First, when the three-phase AC power (R, S, T) supplied from the switchboard is supplied to the motor 150 serving as a load, the current of each phase is detected by the detectors 101 to 103 mounted at predetermined positions on each power line in real time. Is detected and passed to data converter 110.

The data converter 110 converts the voltage / current detection value of each phase detected in real time into digital data information, and converts it into element-specific information for determining power quality based on the converted data, thereby converting it into power state data. It is provided to the state detection apparatus 120. Here, the basic element information for determining the power quality includes power factor, harmonic occurrence, overcurrent, surge, disconnection, swell, etc., and calculates the basic element quality based on the current and voltage detected for each phase. Since the method to be used applies the method used by a well-known power measuring method as it is, detailed description is abbreviate | omitted.

The electrical abnormal state detection device 120 stores the supplied power state data in the memory 121 and executes a detection algorithm for detecting electrical contact failure and arc previously stored in the memory 121 in the digital signal processor 122. Detects electrical contact failure and arc. Here, the detection algorithm for detecting electrical contact failure and arc is calculated by extracting power quality based on the power state data and the waveform in the steady state stored for each motor type, and analyzing the amount of change by the extracted power quality elements. In the case of a change, a fuzzy rule table for the amount of change is applied to detect an electrical contact failure and an arc.

Here, the amount of change in power quality for each element is determined to be a change in power quality even if a change in quality occurs for any one of a plurality of power quality.

3A is a graph illustrating waveforms of a starting motor and a resistance load when no contact failure and an arc occur, and FIG. 3B is a graph showing waveforms of a starting motor and resistance load when contact failure and an arc occur.

Therefore, the voltage / current waveform in the abnormal state and the voltage / current waveform at the time of contact failure or arc generation are different. Therefore, when the voltage / current waveform is used, it is easy to know whether the power quality is changed. One of the easiest ways to determine the change in power quality of each element is to compare the power quality of each element of the previous state and the power quality of each element of the current state to determine whether the power quality has changed.

Next, if there is no change in power quality or a change in power quality occurs, but the amount of change is very small, it is judged to be in a normal state.In contrast, a change in power quality has occurred, and the amount of change is determined to be normal. In case of exceeding the criteria, the judgment is made as an abnormal state, and the fuzzy rule table for the amount of change is applied.

) 및 전압 THDE(

)의 출현 여부, 검출전압과 아크 판단의 기준이 되는 전류 임계치(

) 및 전류 THDE(

)의 출현 여부, 전압 임계치와 전압 THDE와의 상관관계, 전류 임계치와 전류 THDE와의 상관관례를 고려하여 퍼지 룰 테이블을 구현하였다.4A to 4F illustrate an example of a fuzzy rule table implemented in the present invention. Here, ZO is set to 1, PS is set to 2, PM is set to 4, and PB is set to 6, and the voltage threshold value of the harmonics which is the reference for detecting voltage (V) and arc judgment (

) And voltage THDE (

), The current threshold that is the basis for the detection voltage and arc judgment (

) And current THDE (

Fuzzy rule table is implemented in consideration of the presence of), correlation between voltage threshold and voltage THDE, and correlation between current threshold and current THDE.

The result value is calculated by substituting the detected change amount for each element into the fuzzy rule table, and the obtained result value is determined by using the multi-faceted evaluation method as shown in FIG.

Here, the multi-faceted evaluation method does not determine that contact failure and arcing occur when six result values (I, II, III, IV, V, VI) are in the hexagon represented by 10, whereas six result values are shown in FIG. As described above, in the case of being out of the hexagon represented by 10, it is judged as contact failure and arc generation. Referring to FIG. 5, if the value of V is larger than the other values, or the values of IV, V, VI are normal, and the values of I, II, III exceed the reference values, contact failure and arc Judging by the occurrence.

As a result of the primary determination by the known method, if it is determined that the contact failure or the arc is generated, it is checked whether the contact lasts for a predetermined period of time calculated in advance to determine the electrical contact failure and the arc generation for reliability. This is because the tunnel lamp, which is the load, does not cause an error when the electrical contact failure or the arc occurs momentarily and then returns to the normal state, so that an alarm does not occur when the contact failure or the arc occurs momentarily. Here, in the present invention, it was judged whether or not the electrical contact failure and arc generation for a certain period (duration time), it is also possible to determine the final electrical contact failure and arc generation by using the repeated number of arcs generated in addition to this method.

Afterwards, if it is finally determined that the electrical contact failure and arc generation, to alert the electrical contact failure and arc generation, and at the same time to automatically cut off the power supplied to the motor 150 to prevent the electrical contact failure and arc to lead to an electrical fire. do. Here, the method for alarming the electrical contact failure and arc generation, consists of transmitting the alarm control signal for the alarm of the abnormal state to the alarm device (130). The alarm device 130 generates an alarm signal visually or audibly according to the alarm control signal transmitted, and transmits the status information of the motor control panel to a manager or control system located remotely through a communication device (RS-485 communication module). It is also possible to provide.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

101, 102, 103... Detector
110 ... Data converter
120 ... Electrical abnormal state detection device
130... Alarm device

Claims (5)

delete delete delete delete A detector for detecting a state value of power supplied to the motor in real time; A data converter for digitizing the state value of the power source detected by the detector and converting the power state data into power state data; Based on the power state data converted by the data converter, a detection algorithm for detecting an electrical contact failure and an arc is executed to detect an electrical contact failure and an arc of the motor control panel. In the motor control panel for generating an electrical abnormal state detection device that generates and controls the interruption of the power supplied to the motor, to detect an electrical abnormal state such as contact failure or arc,
The electrical abnormal state detection device,
A memory for storing the power state data and storing data on a waveform of a steady state for each motor type;
And a digital signal processor (DSP) for determining whether an abnormal state of the motor is performed by executing a detection algorithm for detecting electrical contact failure and arc based on the stored power state data and a waveform of a steady state for each motor type. Motor control panel with electrical abnormal state detection.

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