KR101307470B1 - Arc flash detection man-machine interface - Google Patents

Abstract

PURPOSE: An arc flash detection man-machine interface (MMI) is provided to accurately produce arc flash energy which can be changed according to various conditions, thereby effectively performing warning and disaster prevention according to the arc flash energy and a distance. CONSTITUTION: An MMI outputs setting information, which includes at least one of a setting value inputted in a setting input step, a sensing value detected by a sensor, and a calculation value calculated by using the setting value or the sensing value, to an information providing area (100). The MMI outputs a protection range calculated by using at least one of the setting value, the sensing value, or the calculation value and an area mark for dividing a boundary distance defined by the protection range in a distance range unit to an information providing area (200). Distance ranges consist of the multiple. Each of the distance ranges is classified by sectioning a relative distance from a measured object according to a risk class. [Reference numerals] (AA) Arc flash analysis diagnosis system; (BB) Arc trouble voltage; (CC) Arc energy; (DD) Arc energy summary; (EE) UV light arc sensor 1; (FF) UV light arc sensor 2; (GG) Arc duration time; (HH) 85% arc duration time; (II) Normalization arc incident energy; (JJ) Arc incident generating energy; (KK) Arc protection boundary area; (LL) UV light arc sensor 3; (MM) UV light arc sensor 4; (NN) Arc protection area; (OO) Access confinement area; (PP) Access limit area; (QQ) Approach prohibition area; (RR) Charging unit; (SS) Arc analysis

Description

Arc Flash Detection Man-Machine Interface

TECHNICAL FIELD The present invention relates to an arc flash sensing man machine interface. In particular, the present invention accurately calculates arc flash energy that can vary by various conditions such as a conductor, a power device, or a load current, and uses the calculated information to calculate arc flash energy and distance. The present invention relates to an arc flash detection man machine interface capable of providing intuitive arc flash information so that warning and disaster prevention can be effectively performed.

Arc flash accidents cause major accidents such as damage to power equipment, secondary damage such as power outages, and injury to workers at the time of a flash accident. Such arc flash accidents occur in a process in which insulation between conductors or power devices which are separated by an insulator, spaced apart from each other, is broken, or energy concentrated in a conductor is released.

Such an arc flash emits a lot of energy in a very short moment, so it emits high heat, very strong light, and a very large amount of energy that will cause components at the arc generating site. However, the arc flash is characterized by having a current value lower than the short-circuit current in general, as compared to emitting a large amount of energy for a short time, it is difficult to detect and cope with the occurrence of the arc flash through the detection of the current. That is, there is a problem that it is difficult to distinguish whether the arc flash is generated or the short-circuit current only by checking the current.

Therefore, as in Korean Patent Laid-Open Publication No. 10-2010-0013283, the arc flash is detected by using a light sensing element to increase the arc flash detection accuracy.

The detection of such an arc flash is the basis for ensuring the correct operation time of a protective device such as a circuit breaker, thereby effectively preventing the occurrence of an injury to a load, a power system, and an operator in case of an accident. However, by dealing with the occurrence of the arc flash there is plenty of room for injury to the operator or manager.

Therefore, the occurrence range and damage of the arc flash is predicted, the arc flash generating area is notified to the worker, the entry into the generating area is prevented, and safety measures corresponding to each area are provided at the time of entry so that the worker or the manager may be injured. There is a need to rule out room for occurrence.

In addition, in order to accurately predict and generate the boundary of the generation, the arc flash range and energy level must be accurately calculated.

Accordingly, an object of the present invention is to accurately calculate the arc flash energy that can vary by various conditions such as a conductor, a power device or a load current, and to effectively warn and prevent disasters according to the arc flash energy and distance by using the calculated information. It provides an arc flash detection man machine interface that provides intuitive arc flash information.

In order to achieve the above object, the arc flash detection man machine interface according to the present invention is provided with an output unit by the calculation unit to provide information on the detection of the arc flash generated in the conductor or power device to which power is supplied and the arc flash influence range. In the interface output through the setting information, the setting information including at least one of the setting value input in the setting input step, the detection value detected by the sensor, the setting value or the calculated value calculated using the detected value is outputted Information provision area; And an area display in which the calculation unit divides the protection range calculated using any one or more of the set value, the detection value, or the calculated value and the boundary distance designated by the protection range in distance range units. Alarm providing area; characterized in that comprises a.

The distance range is composed of a plurality, characterized in that each of the distance range is divided according to the risk level relative distance from the object to be observed.

The area display includes a distance range image in which the distance range or the hazard class is represented by concentric circles having different radii or colors, and a bar graph partitioned with cells, and an index in which the color or radius or division of the distance range is described. Characterized in that the configuration.

The index may be displayed by being superimposed on the distance range image.

The distance range image indicates that when there is an access body approaching the observation object, the section of the distance range corresponding to the position of the access body indicates the access by any one or more of lighting, blinking, brightness control, and color change. It features.

A setting input step of inputting a setting value including any one or more of a panel type, grounding status, three-phase short-circuit current, working distance, conductor spacing, grid voltage, and equipment type to a calculation unit; Calculating, by the operation unit, an arc fault current using the set value; An arc duration calculating step of calculating a time required for the protective relay or the circuit breaker connected to the conductor or power device to remove the arcing; Calculating, by the operation unit, arc accident energy using the set value and the fault current; And calculating the protection range by using the calculation unit using the set value, the fault current, and the arc accident energy.

The calculating of the protection range may include: calculating, by the calculation unit, arc accident energy for each distance by using the set value, the fault current, and the arc accident energy; And calculating a protection boundary distance based on the set value, the fault current, the arc accident energy, and the arc accident energy for each distance.

The protection range is calculated using a different formula depending on the low and high pressure.

The arc flash detection man machine interface according to the present invention accurately calculates the arc flash energy that may vary according to various conditions such as a conductor, a power device or a load current, and uses the calculated information to warn the arc flash energy and the distance. And it is possible to provide intuitive arc flash-related information to effectively perform disaster prevention.

1 illustrates an arc flash detection and blocking system in accordance with the present invention.
2 is a flow chart illustrating an arc flash energy calculation process according to the present invention.
3 is an exemplary diagram showing an example of a power system operation mode.
Figure 4 is an exemplary view showing the characteristic change of accident energy according to the arc fault current change.
Figure 5 is an illustration showing the configuration of the arc flash detection man machine interface according to the present invention.
6 and 7 are exemplary diagrams for explaining information selection.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. In the accompanying drawings, it should be noted that the same reference numerals are used in the drawings to designate the same configuration in other drawings as much as possible. In addition, in describing the present invention, when it is determined that a detailed description of a related known function or known configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. And certain features shown in the drawings are intended to be illustrative, not limiting, or reduced, or simplified, and the drawings and elements thereof are not necessarily drawn to scale. However, those skilled in the art will readily understand these details.

1 is an exemplary view showing an arc flash detection and blocking system according to the present invention.

Referring to FIG. 1, the arc flash detection and blocking system according to the present invention includes a sensor unit 10, an input unit 20, an output unit 30, a power supply unit 60, a communication unit 80, and an operation unit 70. It is configured by.

The arc flash detection and blocking system according to the present invention is installed in a portion that is composed of a conductor and a power device for supplying power, such as a switchboard, a breaker of a distribution panel, a transformer, and detects an arc flash generated in the power device and the conductor, and a short time By breaking the upper circuit breaker, the safety of conductors, power devices and connected loads, and managers are ensured. In particular, the arc flash detection and blocking system according to the present invention significantly reduces the occurrence of malfunctions and increases the detection efficiency and accuracy by detecting a load current and using it together with light sensing to prevent malfunctions caused by misrecognition of external light.

The sensor unit 10 includes a plurality of sensors and a plurality of sensors to detect various sensing targets and provide a detection result to the calculation unit 70. To this end, the sensor unit 10 includes an optical sensor 11, a current sensor 12, a door sensor 13, and a distance sensor 14.

The optical sensor 11 monitors the conductor and the power device, detects an arc flash generated from the conductor and the power device, and transmits the detection result to the calculation unit 70. To this end, the optical sensor 11 may be configured in plural, and may be configured independently of each other.

The current sensor 12 is installed in the conductor to measure the amount of current supplied to the load. To this end, the current sensor 12 measures the load current of each phase when the conductor is composed of a polyphase line. The current sensor 12 periodically measures the load current and provides the calculated current to the calculation unit 70, and the calculation unit 70 determines the occurrence of the arc flash using the detection result of the optical sensor 11 and the load current.

The distance sensor 14 detects the approach of an object such as a maintenance worker or an animal to a conductor or a power device that may cause an arc flash, and provides a detection result to the calculation unit 70.

When the door sensor 13 is provided with a door for isolating a conductor or a power device, the door sensor 13 detects the opening and closing of the door, and provides the same to the calculation unit 70.

The input unit 20 receives a command for control and adjustment by a user. In particular, the input unit 20 is directly connected to the operation unit 70 directly transfers the input command, the external input connected to the direct input 21 and the communication unit, or a separate long-distance communication line installed in the vicinity of the operation unit 70 It may be configured to include an input 22.

The output unit 30 outputs the processing result processed by the operation unit 70 to provide status information to the user and output and display for controlling the power device or the control device controlling the same. To this end, the output unit 30 includes an LED 31, an LCD 32, and a relay output 33. In addition, the output unit 30 may further include a speaker capable of outputting sound guidance, such as an alarm sound, and a separate warning light capable of providing an alarm, but the present invention is not limited thereto.

The LED (Light Emitting Diode) 31 displays the position where the arc is detected by the optical sensor 11, so that the maintenance personnel can find the position where the arc occurred in a short time.

The Liquid Crystal Display Device (LCD) 32 outputs various types of information provided from the calculating unit 70. The LCD 32 outputs and provides various pieces of information, such as setting information, output information, failure information, operation information, and in particular, whether an arc is generated, which is transmitted from the calculation unit 70.

The power supply unit 60 provides power for the operation of the arc flash detection and blocking system. To this end, the power supply unit 60 receives power from an external power source 62 such as commercial power, converts the power into power available in the system, and stores the converted power in the battery 61. In addition, when the supply of the external power source 62 is stopped, such as a power failure, the power supply unit 60 supplies power so that the system can be driven through the power charged in the battery 61.

The calculating unit 70 determines whether the arc flash is generated according to the detection result detected by the sensor unit 10, and transmits whether or not the arc flash is generated to the user through the output unit 30 or the communication unit 80. On the other hand, the relay output 33 to control the driving of the relay 40 for driving the circuit breaker 50. In addition, the calculation unit 70 controls the output unit 30 and the communication unit 80 to alert and notify the approach of an administrator or the like according to the detection result of the sensor unit 10, and to make an alarm and a notification according to the opening and closing of the door. do.

The communication unit 80 forms a communication channel with an external device or an upper system, provides a remote control command to the operation unit 70, or transmits output information of the operation unit 70 to an external device or an upper system.

2 is a flowchart illustrating an arc flash energy calculation process according to the present invention.

Referring to Figure 2, the arc flash energy calculation method according to the present invention is a data investigation step (S10), power system operation mode determination step (S20), setting input step (S30), arc fault current calculation step (S40), arc It comprises a duration calculation step (S50), the arc accident energy calculation step (S60) and the protection range calculation step (S70).

In the data investigation step (S10), whether the accident is caused by the state of the power system and the arc accident energy, and investigates such matters as the expected location of the accident. For this purpose, in the data investigation step (S10), the transformer capacity, motor capacity, grounding method, the configuration of the power circuit, such as the wiring diagram will be confirmed.

Power system operation mode determination step (S20) is a step for determining the system operating conditions for accurate calculation of the short-circuit current. Specifically, in the power system operation mode determination step (S20), the power system operation mode is determined by checking the number of power receiving methods, whether a bus tie breaker is inserted or opened, parallel operation of a generator or a reserve. .

The setting input step S30 is a step of inputting basic settings for calculating a protection range for the determined power system. In this setting input step S30, various items such as panel type (open type or box type), ground or ungrounded, three phase short-circuit current (Ibf) working distance, conductor spacing, grid voltage, and equipment type are inputted. Here, the calculation method of the three-phase short-circuit current will be described in more detail with reference to FIG. 3. Here, the conductor spacing (or booth spacing) is set to 152mm for 15kV switchgear, 104mm for 5kV switchgear, 32mm for low pressure switchgear, 25mm for low voltage MCC and panel board, and 13mm for cable. In addition, the working distance is the minimum safety distance and refers to the working distance of the operator's face and chest rather than the distance of the operator's hand or arm from the point of failure. Specifically, high voltage switchgear can be set as 910mm, low voltage switchgear as 610mm, low voltage MCC and panel board, and cable as 455mm, and these settings are specified by Institute of Electrical and Electronics Engineers (IEEE) Standard 1584-2002. Can be followed.

Arc fault current calculating step (S40) is a step of calculating the arc current (Ia) through the input from the setting input step (S30). Here, the arc fault current Ia is calculated by determining a calculation model. The arc fault current Ia is influenced by the magnitude of the short circuit current and is calculated to be lower than the short circuit current because of the arc impedance. Such arc fault current Ia is used to calculate normalized arc energy En. In addition, in the arc fault current calculating step S40, 85% of the arc current Ia is calculated together with the arc current Ia.

Arc duration calculating step (S50) is a step of calculating the arc duration of the protective relay and the breaker based on the input data. In the arc duration calculating step (S50), the time required to remove the arc generated by the operation of the protective relay and the circuit breaker is calculated. To this end, in the arc duration calculating step (S50), the arc duration is calculated by the operation time of the protective relay and the circuit breaker by the items input in the determination step (S20) and the setting input step (S30). For example, the fuse can be obtained by the manufacturer for the carpeting time and arcing time.However, if the fuse cannot be confirmed, the arcing time is calculated by adding the arcing time of 15% up to 0.03 seconds for the average time and 10% for the time over 0.03 seconds. do. In addition, the low voltage MCCB is defined as 1.5 cycles of rated break time, 0.025 seconds, 3.0 cycles (0.050 seconds), 5 cycles (0.080 seconds) for 1-35kV breakers, and 8.0 cycles (0.130) for 35 kV or more breakers. .

In the arc accident energy calculation step (S60), the arc accident energy is calculated using the set values input in the setting input step (S30) and the calculation value calculated in the previous steps, that is, the arc fault current and the arc duration time. At this time, the arc accident energy is calculated for each distance.

In the protection range calculation step S70, the protection boundary distance is calculated using the calculated arc accident energy. The protection boundary distance calculated in this protection range calculation step S70 means a minimum distance that a manager or an operator can minimize personal injury when an arc occurs. In addition, the step of calculating the protection range (S70) may determine the degree of danger by varying the boundary distance according to the level of the arc accident energy, but this does not limit the present invention.

3 is an exemplary diagram illustrating an example of a power system operation mode, and FIG. 4 is an exemplary diagram illustrating an accident energy change characteristic according to an arc fault current change.

2 to 4, the present invention calculates the protective boundary distance by the constant and various calculation values according to the power system operating mode, and provides a warning to the workers within the calculated distance by the power system and the arc flash accident It prevents the accident of managers or prevents the spread of accidents in the shortest time.

To this end, in the setting input step (S30), various setting values are defined according to the matter determined in the operation mode determination step (S20). Specifically, the first constant K1 according to whether the place where the conductor or power device is installed is open or box-type, the second constant K2 according to whether the power circuit is grounded or ungrounded, the grid voltage (V, phase voltage, line to line). Conductor spacing (booth bar or cable) function (G (x)), and three-phase short-circuit current (Ibf) and conductor spacing, depending on the type of equipment, such as voltage), open type, switchgear box, MCC, panel cable The defined working distance D is defined.

Here, the short-circuit current Ibf will be described with an example of the power system as shown in FIG. 3. The three-phase short-circuit current at a failure point is calculated separately because the difference between the maximum short-circuit current and the minimum short-circuit current depends on the power system operating mode. This is because the device rating should be applied with the maximum short-circuit current, but the inverse time operation characteristic of the overcurrent protection relay is the reason that the arc accident energy increases further because the operation time is delayed at the minimum short-circuit current.

First, the calculation of the minimum short-circuit current (tie breaker open state) is based on the short-circuit current supplied from the power supply side (UTIL-1) and the short-circuit current supplied from the load side (LOAD_A) under a 13.8KV switchgear bus fault condition. Calculate by adding up.

However, the calculation of the maximum short-circuit current (tie breaker closing state) is performed under the load side (LOAD_A) circuit failure condition, and the short-circuit current and the load side (LOAD) supplied from the first power supply side UTIL-1 and the second power supply side UTIL-2. -A, LOAD-B) is obtained by adding up the short-circuit current supplied from the rotating equipment.

When the short-circuit current Ibf is obtained, an arc is generated using the set values such as the first constant K1, the second constant K2, the system voltage V, and the function G (x) and the short-circuit current Ibf fmf. The fault current Ia is calculated.

4 is a diagram showing the degree of accident energy change according to the arc fault current change after obtaining a complete three-phase short-circuit current by setting the arc impedance of the fault point to 0 from the equivalent circuit of Thevenin. Theoretically, the magnitude of the incident energy does not change under the condition Ia / Ibf = 1.0pu where the magnitude of the three-phase short-circuit current and the arc fault current are the same. However, since the arc impedance cannot be ignored in the power system, it can be seen that the accident energy changes most significantly in the arc fault current that decreases by 70% of the three-phase short-circuit current. Therefore, the arc fault current Ia is calculated according to the high voltage and the voltage by using the above-described set value and the short-circuit current Ibf.

Equation 1 is an expression for calculating the arc fault current Ia in the case of low voltage (less than 1000V).

Where Ia is arc fault current (kA), K is open (-0.153 = K1) or closed (-0.097), Ibf is symmetrical three-phase short-circuit current (kA), V is grid voltage, and G is between It means a gap (mm). Table 1 shows G values.

Grid voltage (KV) Device form Distance between conductors (mm) Distance coefficient (x)

0.208 to 1 Open air 10-40 2.000 Switchgear 32 1.473 MCC or panel 25 1.641 cable 13 2.000
> 1 ~ 5
Open air 102 2.000 Switchgear 13-102 0.973 cable 13 2.000
> 5 ~ 15
Open air 13-153 2.000 Switchgear 153 0.973 cable 13 2.000

In addition, Equation 2 is an equation for calculating the arc fault current when the high voltage (1000V or more).

In the case of high pressure, it does not distinguish between open type and closed type, so the value does not apply.

On the other hand, if the arc fault rectification (Ia) is calculated as described above and the arc duration time is calculated as described above, the normalized arc energy En is calculated.

Equation 3 below is to calculate the accident energy on the basis of when the arc duration time (t) is 0.2 seconds working distance (D) is 610mm.

Where En is the incident energy (J / cm ² ), K1 is the open type (-0.792) or box type (-0.555), K2 is the direct ground system (-0.113) or ungrounded or high resistance ground system (0), and Ia is Arc fault current, G, means the gap between conductors.

When the normalized arc accident energy En is calculated as described above, the arc accident energy for each distance is calculated, as shown in Equation 4, which is calculated by the IEEE standard 1584.

Where E is the incident energy (J / cm ² ), Cf is 1.0 (greater than 1000V) or 1.5 (1000V or less), t is the arcing time (seconds), D is the working distance (mm), and X is the distance coefficient.

However, in the case where the grid voltage exceeds 15KV, the accident energy calculation is calculated by a formula by Ralph Lee, as shown in Equation 5.

If the arc accident energy for each distance is calculated in this way, the protection range is calculated.

As described above, the protection range refers to the protection distance that can be determined when the arcing current falling on the operator's skin from the failure point is calculated as the accident energy, and corresponds to the protection immediately before causing a curable second degree burn. In addition, in order to protect the electric shock from the exposed charging part, the limit distance can be set by dividing the level according to the distance.

In addition, the protection range may be calculated by Equations 6 and 7 in the case of 15 Kv or less and 15 KV or more, respectively.

In Equations 6 and 7, D _B is the boundary distance from the arcing point (mm), En is trhdpsj E _B is the incident energy at the protective boundary distance (J / cm ² 1.2cal / cm ² = 5.0 J / cm ² ), t is arcing time, x is distance coefficient, and Ibf is symmetrical three-phase short-circuit current.

As such, the boundary distance may be calculated, and the boundary distance may be defined and used as a multi-stage distance range by the user. Specifically, the risk level according to the distance range is divided into 0 to 5, and possible work, clothing, time, and action measures are set at each step to prevent the power system manager from being injured by the arc flash. More specifically, the distance range is divided into a plurality of classes such as a first class from a conductor or a power device, a first class of 0, a first class of a second to a second street, and a second class of a second to a third street. Providing the boundary information, or may perform a protective operation such as a circuit breaker operation, but this does not limit the present invention.

Meanwhile, the setting values and the calculated values of the above-described processes may be input to the processor of FIG. 1 to be processed, but may be calculated by a separate device and may be performed only by the processor, thereby limiting the present invention. It is not.

5 is an exemplary diagram showing the configuration of the arc flash detection man machine interface according to the present invention.

Referring to FIG. 5, the arc flash detection man machine interface according to the present invention is output by the calculator 70 through the LCD of the output unit 30. This interface is a detection result and setting input step (S30), operation mode determination step detected by the light sensor 11, the current sensor 12, the door sensor 13, the distance sensor 14 of the sensor unit 10 (S20) and the data survey step (S10) the information determined and determined by the output is provided.

To this end, the interface is divided into an information providing area 100 and an alarm providing area 200.

The information providing area 100 is detected by the sensor unit 10 and transmitted through the calculation unit 70, setting information including the above-described setting value and information on a sensing value, a conductor or power device or a power system to be detected. Is outputted and provided. Here, the detection value is provided with a detection result for each of the plurality of sensors, and specifically, the detection result of each of the plurality of light sensors 11, current sensors 12, door sensors 13, and distance sensors 14 is a constant period. Or it is provided and output in real time. To this end, the information providing area 100 is configured to include a detail information area 111 that outputs a detection result or setting information. The detailed information area 111 is configured in a different form for each type of sensor or another sensor of the same type, and the output information is configured appropriately for each sensor, but only the same type of sensor is outputted in an intuitive manner. Recognition of personal information can be enabled. Here, the selection of each area may be made by selecting a corresponding area by a separate input device or by directly touching the screen, but the present invention will be described on the assumption that the selection is made without distinction.

To this end, the information providing area 100 includes a device selection area 110 and an information selection 120 area so that a user or an administrator can select a desired device or desired information. The device selection area 110 is an area for allowing an administrator to select a target to output information through the detail information area 111. Specifically, in the device selection area 110, the devices that can be selected by the user are divided into sections, such as 'UV light arc sensors 1 to 4', as shown, and when any one of these sections is selected, the selected device is selected. The details area 111 for is outputted and displayed. In addition, although an example in which the optical arc sensor is composed of 1 to 4 is illustrated in FIG. 5, a section may be configured according to the number of sensors installed, and similarly, the distance sensor 14 and the door sensor 13 may be similarly configured. It can be configured as.

The detail information area 111 outputs values detected by each sensor or information selected by a user among the detected values or information related to the sensors. On the other hand, the information output to the detail area 111 may include basic information about the conductor or the power device at the location where the sensor is installed. For example, FIG. 5 shows an arc duration, 85% arc duration, and normalized arc. The incident energy, arc incident energy, arc protection boundary region is shown as being output. For example, in the case of the optical sensor 11 is installed spaced apart from each other, in particular, it is installed in different equipment to detect the occurrence of arc flash. Therefore, the calculated values such as arc duration time and normalized arc accident energy may be different according to the installation position of the optical sensor 11, and thus the calculated value corresponding to the installation position of each optical sensor 11 in the detail information area 111. It may be output together with the detection result of the optical sensor 11, but this does not limit the present invention.

The alarm providing area 200 is provided by outputting an area display that divides the boundary distance calculated in the above-described process, in particular, the boundary distance in distance range units. 2 to 4, the boundary distance calculated by the formula may be divided into a plurality of distance ranges, and the distance range may be set by dividing the relative distance from the conductor or power device to be observed according to the risk level. It was mentioned.

The area display in this alert providing area 200 is configured in a form corresponding to this distance range. More specifically, the alert providing area 200 may be divided into a distance range image 210 and an index 220 for bending the same, as shown in FIG. 5.

The distance range image may represent a distance range from a conductor or a power device in the form of a bar graph with concentric circles having different radii, concentric circles having different colors, and compartments corresponding to the distance range. The distance range image 210 displays the distance range in the form of a concentric circle with different colors, different radii, and a partitioned bar graph, so that the user or manager can intuitively indicate the risk according to the relative distance from the observation object. It becomes possible to make it aware. In particular, it is possible to minimize the possibility of misrecognition by providing information of each area through the index 220. In addition, the index 220 may be configured on the distance range image, thereby not limiting the present invention. In addition, the distance range image may increase attention by displaying a distance range of a far distance from the observation target as a blue or green color indicating safety and a distance range close to the observation target as a red or fluorescent color.

The distance range image may be displayed such as the occurrence of an arc flash and the position of an object approaching an object to be observed through blinking and lighting of high brightness. That is, when an arc flash occurs, a color that is not used in the distance range image may be brightly lit or flashed after color change to output that the arc flash has occurred. In addition, when the approach of a person or an object is detected on the observation target, it is possible to easily recognize the position and presence of the access body by displaying the distance range corresponding to the position of the access body by turning on or blinking the color change.

In addition, when the sensor is installed in a specific direction to detect a specific direction, the distance range image is partitioned to correspond to each sensor so that the corresponding part can be displayed according to the presence or absence, it is possible to display the approach direction and distance, This does not limit the present invention.

6 and 7 are exemplary diagrams for explaining information selection.

6 and 7, the interface of the present invention intuitively provides information in a form that can be recognized by an administrator or a user, and can also view detailed information so that an administrator or a user needs information. To easily obtain.

To this end, the interface may classify the information so that the administrator or user can easily obtain the information needed by the administrator or the user, and select the information through the information selection area 120.

In particular, the interface of the present invention provides information for preventing the occurrence of an arc flash and the resulting accident. In the information selection area 120, as shown in FIGS. 6 and 7, arc flash related information is separately provided. A selection area grouped and connected to the grouped information may be configured.

In particular, as shown in FIG. 7, the user can confirm the protection means to be worn in each area, the measures to be performed in advance for the work, and the like, thereby ensuring the safety of the user or the administrator.

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, . ≪ / RTI > Accordingly, such modifications are deemed to be within the scope of the present invention, and the scope of the present invention should be determined by the following claims.

10: sensor unit 11: light sensor
12 current sensor 13 door sensor
14: distance sensor 20: input unit
21: integrated input 22: external input
30: output 31: LED
32: LCD 33: relay output
40: relay 50: breaker
60: power supply 61: battery
70: calculation unit 80: communication unit

Claims (8)

In the interface that is output through the output unit by the calculation unit, in order to detect the arc flash generated from the conductor or power device to be supplied, the information on the arc flash influence range,
An information providing area for outputting setting information including any one or more of a setting value input in the setting input step, a detection value detected by a sensor, the setting value or a calculation value calculated using the detection value; And
An alarm in which the calculation unit outputs an area display in which the protection range calculated using any one or more of the set value, the detected value, or the calculated value and the boundary distance designated by the protection range are divided into distance range units; It comprises a; providing area;
The distance range is composed of a plurality, each of the distance range is divided according to the risk level relative distance from the observation target,
The area display includes a distance range image in which the distance range or the hazard class is represented by concentric circles having different radii or colors, and a bar graph partitioned with cells, and an index in which the color or radius or division of the distance range is described. Configured by
The setting value or the calculated value is a setting input step of inputting a setting value including any one or more of a panel type, grounding, three-phase short-circuit current, working distance, conductor interval, grid voltage, equipment type to the operation unit; Calculating, by the operation unit, an arc fault current using the set value; An arc duration calculating step of calculating a time required for the protective relay or the circuit breaker connected to the conductor or power device to remove the arcing; Calculating, by the calculator, arc accident energy using the set value and the fault current; And calculating, by the calculation unit, a protection range using the set value, the fault current, and the arc accident energy.
The calculating of the protection range may include: calculating, by the calculation unit, arc accident energy for each distance by using the set value, the fault current, and the arc accident energy; And calculating a guard boundary distance based on the set value, the fault current, the arc accident energy, and the arc accident energy for each distance.
The protection range
Grid voltage or less when exceeding 15KV and 15KV detected arc flash with each other, characterized by that which is calculated using another calculation formula man-machine interface. delete delete The method of claim 1,
And the index is displayed superimposed on the distance range image. The method of claim 1,
The distance range image is
When there is an access body approaching the observation target, the arc flash is characterized in that the partition of the distance range corresponding to the position of the access body indicates the approach by one or more of lighting, blinking, brightness control, color change Discovery Man Machine Interface. delete delete delete

Images