KR102453103B1 - Simulated test apparatus for DC grounding integrated system configuration method - Google Patents

Abstract

The present invention relates to a method for configuring a DC grounding integrated system and a simulation test apparatus that can implement and simulate the DC grounding method presented in the international standard (IEC 60364) standard through system circuit configuration through transfer using a DC switch. The DC grounding method integrated system configuration method according to an embodiment of the present invention includes the steps of selecting a DC power method according to the presence or absence of an intermediate line (S10), selecting a grounding method between grid components (S20), and the selected DC power method and In accordance with the grounding method, the control unit controls the DC switch to perform switch switching for configuring a system circuit between the DC power source and the DC load and the system protective ground or facility protective ground (S30). In addition, applying the selected DC power, extracting the fault voltage or fault current data through the simulation of the ground fault of the DC load (S40), and analyzing the extracted fault voltage or fault current data (S50) and the accident It includes a step (S60) of determining a ground fault occurring in the DC power distribution system based on the analysis result of the voltage or fault current data.

Description

DC grounding integrated system configuration method and simulation test apparatus {Simulated test apparatus for DC grounding integrated system configuration method}

The present invention relates to a method and a simulation test apparatus for an integrated DC grounding system, and more particularly, by using a DC switch to implement a DC grounding method presented in the international standard (IEC 60364) standard through a system circuit configuration through transfer, and It relates to a simulated DC grounding method integrated system configuration method and a simulation test device.

Recently, interest in DC systems in buildings and power distribution fields is increasing worldwide. In addition, as new and renewable energy power generation facilities are spreading due to global warming and the nuclear phase-out policy, DC power is rapidly being supplied.

In addition, since the efficiency of the DC power distribution system has been verified in terms of power conversion efficiency of energy even with the expansion of digital loads, users' demands for DC power distribution are increasing. Although this is a good solution to solve the problems of power quality and energy efficiency, the technical environment for electrical safety such as grounding technology and fault detection and blocking technology is insufficient so far, and its use is extremely limited.

On the other hand, the demonstration of the conventional DC power distribution-related technology has been focused on the linked operation of the developed equipment, and various tests such as load simulation and system simulation are impossible. Accordingly, from the point of view of the grounding system and protection, it is designed to implement a grounding method that conforms to the international standard for the DC 2-wire or 3-wire power supply method applied in the low voltage range, so it is possible to evaluate the safety of the load device as well as the safety test of the DC system. In order to do this, I would like to suggest how to implement each grounding method in the integrated circuit.

Republic of Korea Patent Registration No. 10-0626813 (announced on September 20, 2006)

Therefore, the technical problem to be achieved by the present invention is to solve the disadvantages of the prior art, and it is intended to simulate the DC grounding method suggested in the international standard (IEC60364) standard through the switch control of the simulation test device in one system. There is this.

In addition, it is intended to improve the reliability of the DC grounding system through the analysis of the DC grounding system by applying it to a simulation test of a distribution system using a DC power source. In addition, the purpose is to use it as a device for various tests on the grounding system of the KEC (Korea Electro-technical Code, Korea Electrical Equipment Regulations) standard and education of the grounding system configuration method.

In order to achieve this technical task, the DC grounding method integrated system configuration method according to an aspect of the present invention includes the steps of selecting a DC power supply method according to the presence or absence of an intermediate line (S10), and selecting a grounding method between system components (S20) And according to the selected DC power method and grounding method, the control unit controls the DC switch to perform switch switching to configure a grid circuit between the DC power and the DC load and the grid protective ground or facility protective ground (S30).

In addition, applying the selected DC power, extracting the fault voltage or fault current data through the simulation of the ground fault of the DC load (S40), and analyzing the extracted fault voltage or fault current data (S50) and the accident It includes a step (S60) of determining a ground fault occurring in the DC power distribution system based on the analysis result of the voltage or fault current data.

At this time, after performing the switch switching step (S30), extracting a simulation model of the DC grounding system integrated system configuration corresponding to the system circuit configured according to the DC power supply method and the DC system grounding method (S31); The method may further include calculating fault voltage or fault current data appearing through a ground fault fault simulation of a DC load using the simulation model (S32).

In addition, the step of analyzing the data (S50) compares the fault voltage or fault current calculated through the data calculation step (S32) with the fault voltage or fault current data extracted through the system circuit, and compares It further includes a step (S51) of analyzing the failure data at the time of the accident based on the result.

In addition, the DC grounding method integrated system configuration simulation test apparatus 10 according to another aspect of the present invention may include a measuring unit, a switching unit, a resistance unit, a control unit, a calculating unit, a voltage and current analysis unit, a determining unit, a storage unit and a display unit. can

In addition, the measuring unit is installed in each line of the simulation device to measure the current value or the voltage value. In addition, according to the presence or absence of a middle line of the DC power source and the grounding method of the DC system, the switching unit connects the positive terminal and the negative terminal or the intermediate line terminal of the DC power to at least one of the system protective ground, the facility protective ground, and the DC load. Perform switching of the switch.

In addition, the control unit configures a system circuit for a simulation test by controlling the switching unit according to a preset DC power supply method and a grounding method of the DC system. In addition, the calculation unit derives a simulation model corresponding to the system circuit configured by the control unit, and calculates the fault voltage or fault current data appearing through the simulation of the ground fault of the DC load by using the simulation model.

In addition, the voltage and current analysis unit compares the fault voltage or fault current calculated value calculated through the calculation unit and the measured value measured through the system circuit, and analyzes the failure data when an accident occurs based on the comparison result. In addition, the determination unit determines a ground fault occurring in the DC power distribution system based on the analysis result of the voltage and current analysis unit.

As described above, the DC grounding method integrated system configuration method and the simulation test device according to the present invention implement the DC grounding method presented in the international standard (IEC60364) standard through the switch control of the simulation test device in one system and perform a simulation test. There is an effect that can be done.

In addition, it is possible to improve the reliability of the DC grounding system through the analysis of the DC grounding system by applying it to a simulation test of a power distribution system using a DC power source. In addition, it has the effect that it can be used as a device for various tests on the grounding system of the KEC (Korea Electro-technical Code, Korea Electrical Equipment Regulations) standard and education of the grounding system configuration method.

In addition, it is possible to derive data for the analysis of various accidents occurring in the system, and there is an effect of deriving a simulation model according to each grounding type through a failure simulation test. In addition, it is possible to derive the fault current flowing through the human body and compare the calculated value of the fault current with the measured value of the DC grounding integrated system configuration simulation test device to analyze the fault data when an accident occurs.

In addition, it is effective to establish standards and establish a demonstration test facility infrastructure by deriving safety evaluation items for DC load devices and systems through experiments and research on various grounding system configurations.

1 is a block diagram showing a DC grounding method integrated system configuration simulation test apparatus according to an embodiment of the present invention.
2 is a block diagram illustrating an apparatus for simulating a DC grounding type integrated system configuration according to an embodiment of the present invention.
3 is a diagram illustrating a switching unit according to an embodiment of the present invention.
4 is a view showing a resistor according to an embodiment of the present invention.
5 is a circuit diagram illustrating an apparatus for simulating a DC grounding integrated system configuration according to an embodiment of the present invention.
6 is a flowchart illustrating a method for configuring a DC grounding integrated system according to an embodiment of the present invention.
7 is a flowchart illustrating a method for configuring a DC grounding integrated system according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated. In addition, terms such as “…unit”, “…group”, “…module”, etc. described in the specification mean a unit that processes at least one function or operation, which is implemented by hardware or software or a combination of hardware and software. can be

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

Like reference numerals in each figure indicate like elements.

1 is a block diagram showing a DC grounding method integrated system configuration simulation test apparatus 10 according to an embodiment of the present invention, and FIG. 2 is a DC grounding method integrated system configuration simulation test apparatus 10 according to an embodiment of the present invention. It is a block diagram showing

In addition, FIG. 3 is a diagram showing the switching unit 200 according to an embodiment of the present invention, FIG. 4 is a diagram showing the resistor unit 300 according to an embodiment of the present invention, and FIG. 5 is an embodiment of the present invention. It is a circuit diagram showing the DC grounding method integrated system configuration simulation device 10 according to the That is, FIG. 5 shows a simulation model of the DC grounding type integrated system configuration simulation test apparatus 10 .

DC grounding method integrated system configuration method and simulation test apparatus 10 according to an embodiment of the present invention, as shown in FIGS. 1 and 2, DC switches 201, 202, 203, 204, 205, 206, 207, 208 , 209, 210, 211) provides a method and a simulation test device 10 that can implement the individual DC grounding method presented in the international standard (IEC 60364) as an integrated system through system circuit configuration through transfer.

In general, according to the definition of the international standard (IEC 60364), the grounding method of the DC system can be classified into a TT system, an IT system, and a TN system.

At this time, the first character of the grounding method indicates the relationship between the DC power supply 20 and the earth. That is, T in the first letter indicates that the DC power supply 20 is directly grounded to the earth, and I indicates that the DC power supply 20 is insulated from the earth or grounded to the earth through an impedance.

In addition, the second character of the grounding method indicates the relationship between the conductive exposed portion of the DC load 30 device and the ground. That is, the T in the second letter indicates that the conductive exposed portion is directly grounded to the earth, and N indicates the grounding of the neutral line.

In addition, the third character of the grounding method indicates whether the intermediate line and the protective conductor are separated. That is, S in the third letter indicates that the intermediate line and the protective conductor are separated, and C indicates that a single conductor is laid in a state where the intermediate line and the protective conductor are combined.

The DC grounding method integrated system configuration simulation test apparatus 10 according to an embodiment of the present invention conducts a simulation test for the grounding method of the consumer system using a low voltage of 1500V DC or less to secure grounding safety technology for DC distribution. can

In addition, the DC grounding method integrated system configuration simulation test apparatus 10 according to an embodiment of the present invention includes a measurement unit 100 , a switching unit 200 , a resistance unit 300 , a control unit 400 , an operation unit 500 , It may include a voltage and current analysis unit 600 , a determination unit 700 , a storage unit 800 , and a display unit 900 .

The measuring unit 100 is installed on each line of the simulation device 10 to measure a current value or a voltage value. In addition, the measuring unit 100 includes at least one ammeter 110 and a voltmeter 120 .

The switching unit 200 connects the positive terminal and the negative terminal or the intermediate line terminal of the DC power source 20 according to the presence or absence of the intermediate line of the DC power source 20 and the grounding method of the DC system to the system protective ground 41 and the facility protective ground. Each of the DC switches 201 , 202 , 203 , 204 , 205 , 206 , 207 , 208 , 209 , 210 , 211 is connected or disconnected to be connected to at least one of 42 and the DC load 30 .

In addition, the switching unit 200 includes a first switch 201 , a second switch 202 , a third switch 203 , a fourth switch 204 , a fifth switch 205 , a sixth switch 206 , It includes a seventh switch 207 , an eighth switch 208 , a ninth switch 209 , a tenth switch 210 , and an eleventh switch 211 .

That is, the first switch 201 is disposed between the negative terminal of the DC 3-wire power supply 21 or the negative terminal of the DC 2-wire power supply 22 and the system protective ground 41 . In addition, the second switch 202 is disposed between the first switch 201 and the system protection ground (41).

At this time, a high impedance 310 is provided between the second switch 202 and the system protection ground 41 . In addition, the third switch 203 is disposed between the middle line of the DC 3-wire power supply 21 and the second switch 202 and the fifth switch 205 .

In addition, the fourth switch 204 is disposed between the positive terminal of the DC 3-wire power supply 21 or the positive terminal of the DC 2-wire power supply 22 , and the second switch 202 and the fifth switch 205 . . In addition, the fifth switch 205 is disposed between the fourth switch 204 and the system protection ground 41 and the facility protection ground 42 .

The sixth switch 206 is disposed between the system protection ground 41 and the facility protection ground 42 . The seventh switch 207 is disposed between the middle line of the DC 3-wire power supply 21 and the DC load 30 . In addition, the eighth switch 208 is disposed between the negative terminal of the DC 3-wire power supply 21 or the negative terminal of the DC 2-wire power supply 22 and the exposed conductive part 32 of the DC load 30 .

In addition, the ninth switch 209 is disposed between the negative terminal of the DC 3-wire power supply 21 or the negative terminal of the DC 2-wire power supply 22 , the DC load 30 and the facility protection ground 42 . In addition, the tenth switch 210 is disposed between the intermediate line of the DC 3-wire power supply 21 and the facility protection ground 42 . In addition, the eleventh switch 211 is disposed between the tenth switch 210 and the facility protection ground 42 .

In addition, the resistor 300 includes a power supply resistor 301 , a positive terminal conductor resistance 302 , a negative terminal conductor resistance 303 , a middle line conductor resistance 304 , a load side positive conductor resistance 305 , and a load side It may include a protective conductor resistor 306 , a load-side grounding resistor 307 , a power-side grounding resistor 309 , and a high impedance 310 .

The control unit 400 controls the operation unit 500 , the voltage and current analysis unit 600 , the determination unit 700 , the storage unit 800 , and the display unit 900 . In addition, the control unit 400 configures a system circuit for the simulation test by controlling the switching unit 200 according to the preset DC power supply 20 method and the grounding method of the DC system.

In addition, the control unit 400 controls the measuring unit 100 to simulate a positive earth fault, a negative earth fault, or a short circuit between lines after a DC power supply 20 is applied to the simulation device 10, and data of various accidents occurring in the system. can be measured.

According to the presence or absence of a middle wire of the DC power supply 20, the DC power supply 20 may be classified into a DC 3-wire power supply 21 with a middle wire and a DC 2-wire power supply 22 without a middle wire. In addition, it can be classified into a TT system (system), an IT system (system), and a TN system (system) according to the grounding method of the DC system.

That is, it can be classified into a TT system, an IT system, and a TN system depending on whether the positive terminal, the negative terminal, and the intermediate line of the DC power supply 20 are grounded. In addition, the TN system may be classified into a TN-S system and a TN-C system depending on whether the intermediate line and the protective conductor are separated.

[Table 1] Switch operation arrangement by DC 2-wire type grounding method

[Table 2] Switch operation arrangement by DC 3-wire grounding method

[Table 1] shows the switching operation of the DC 2-wire grounding method, and [Table 2] shows the switching operation of the DC 3-wire grounding method. That is, [Table 1] shows the switch operation method for each grounding method of the grounding system in the DC 2-wire power supply 22 without an intermediate line, and [Table 2] shows the intermediate line in the DC 3-wire type power supply 21 with the intermediate line. Shows the switch operation method for each grounding method of the grounding system through

In the case of the DC 3-wire power supply 21, in addition to the intermediate line grounding method shown in [Table 2], a system configuration through positive grounding and negative grounding is possible.

In this way, the control unit 400 controls the switching unit 200 as shown in [Table 1] and [Table 2] according to the preset DC power supply 20 method and the grounding method of the DC system.

For example, in the case of a DC power supply 20 method is a DC 2-wire type power source 22, and a ground method is a TT system, as shown in [Table 1], according to the control of the control unit 400, the first switch ( 201), the fifth switch 205, the eighth switch 208, and the eleventh switch 211 are connected (On).

Through this, the negative pole of the DC 2-wire power supply 22 is directly connected to the system protective ground 41 without passing through the high impedance 310 . In addition, the negative electrode of the DC 2-wire type power supply 22 is connected to the exposed conductive part 32 of the DC load 30 through the eighth switch 208 , and the exposed conductive part 32 connects the eleventh switch 211 . It is connected to the facility protection ground 42 through the ground.

In addition, when the DC power supply 20 method is a DC 3-wire type power source 21, and the ground method is an IT system, the second switch 202 is controlled by the control unit 400 as shown in [Table 2]. ), the third switch 203, the seventh switch 207, the eighth switch 208, and the eleventh switch 211 are connected (On).

Through this, the middle line of the DC 3-wire type power supply 21 is connected to the system protection ground 41 through the high impedance 310 . That is, the second switch 202 is connected to the high impedance 310 to simulate the grounding method of the IT system.

In addition, the negative electrode of the DC 3-wire power supply 21 is connected to the exposed conductive part 32 of the DC load 30 through the eighth switch 208 , and the exposed conductive part 32 connects the eleventh switch 211 . It is connected to the facility protection ground 42 through the ground.

The operation unit 500 derives a simulation model corresponding to the system circuit of the simulation device 10 configured by the control unit 400, and uses the simulation model to generate a fault voltage or fault current that appears through a ground fault simulation of a DC load. It can be derived by calculating the data.

That is, the operation unit 500 derives a simulation model according to each grounding method as shown in FIG. 5 when simulating a failure through the operation of the switching unit 200 in the DC grounding method integrated system configuration simulation test apparatus 10 . can do.

After the DC power source 20 method and the grounding method of the DC system are selected, the calculating unit 500 is configured according to the DC power supply 20 method and the grounding method of the DC system. A simulation model of the corresponding DC grounding type integrated system configuration is extracted. In addition, the calculator 500 may calculate the fault current 311 flowing through the human body according to the grounding method of the DC system by using the measurement data of the measuring unit 100 and each resistance value of the simulation model.

In this case, the fault current (hereinafter, human body current) 311 flowing through the human body according to the grounding method of the DC system may be expressed as in [Equation 1] to [Equation 4] below. That is, [Equation 1] shows the case where the grounding method is a TT system (system), [Equation 2] shows the case where the grounding method is a TN system (system), and [Equation 3] shows that the grounding method is IT Shows the case of a system.

[Equation 1]

- TT system (system):

[Equation 2]

- TN system:

[Equation 3]

- IT system:

[Equation 4]

Here, R ₀ is the power supply resistance 301 , R _L1 is the positive terminal conductor resistance 302 , and R _L2 is the negative terminal conductor resistance 303 . Further, R _L3 is the middle line conductor resistance 304 , R _C1 is the load side positive conductor resistance 305 , and R _C2 indicates the load side protective conductor resistance 306 . In addition, R _PE is the load-side grounding resistance 307 , R _b is the human body resistance 308 , and R _g is the power-side grounding resistance 309 . Also, R _H is a high impedance 310 , and I _b represents a human body current 311 .

The voltage and current analysis unit 600 compares the fault current calculated value extracted through the calculating unit 500 and the measured value measured through the DC grounding method integrated system configuration simulation test device 10, and based on the comparison result, when an accident occurs Analyze the failure data of

That is, the voltage and current analysis unit 600 may derive failure data of various accidents occurring in the system by analyzing the fault voltage or current data appearing through the ground fault fault simulation of the DC load 30 .

The determination unit 700 may determine a ground fault occurring in the DC power distribution system based on the analysis result of the voltage and current analysis unit 600 . In addition, the storage unit 800 stores the measurement data of the measurement unit 100 and the switch operation data of the switching unit 200 according to the DC power supply 20 method and the grounding method of the DC system.

Also, the display unit 900 may display measurement data measured by the measurement unit 100 . In addition, the display unit 900 may display a switch configuration circuit diagram of the DC grounding integrated system configuration simulation test apparatus 10 configured according to the DC power supply 20 method and the DC system grounding method.

As described above, the DC grounding method integrated system configuration simulation test apparatus 10 according to an embodiment of the present invention performs various grounding methods (TT system (TT system) system), IT system, and TN system) are implemented in an integrated grounding circuit to simulate various grounding system configurations according to the DC power supply 20 method and the DC system grounding method, and accident data analysis through this This is possible.

6 is a flowchart illustrating a method of configuring a DC grounding integrated system according to an embodiment of the present invention, and FIG. 7 is a flowchart illustrating a method of configuring a DC grounding integrated system according to an embodiment of the present invention.

The DC grounding method integrated system configuration method according to an embodiment of the present invention includes the steps of selecting a DC power method according to the presence or absence of an intermediate line (S10), selecting a grounding method between grid components (S20), and the selected DC power method and According to the grounding method, the control unit 400 controls the switching unit 200 to change the switch constituting a system circuit between the DC power supply 20 and the DC load 30 and the system protection earth 41 or the facility protection earth 42 . and performing (S30).

That is, the DC 3-wire power supply 21 or DC 2-wire power supply 22 is selected depending on the presence or absence of the intermediate line, and between the TT system, IT system, and TN system in any one of the system configurations. Select the grounding method.

In addition, as shown in [Table 1] and [Table 2], the control unit 400 controls the switching unit 200 of the simulation device 10 according to the selected DC power supply method and grounding method to control the DC switch 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211).

In addition, the DC grounding method integrated system configuration method according to an embodiment of the present invention comprises the DC grounding method integrated system configured according to the DC power supply 20 method and the DC system grounding method after the step (S30) of performing the switch changeover. Step (S31) of extracting a simulation model of the DC grounding method integrated system configuration corresponding to the simulation test device 10, and the fault voltage or fault current appearing through the simulation of the ground fault fault of the DC load 30 using the simulation model The method may further include calculating data (S32).

For example, the calculating unit 500 may calculate the fault current (human current) 311 flowing through the human body according to the grounding method of the DC system using Equation 1 to Equation 4 above.

In addition, applying the selected DC power supply 20, and extracting the fault voltage or fault current data through the ground fault simulation of the DC load 30 (S40). That is, by applying the DC power supply 20 to the simulation device 10 and simulating a positive earth fault, a negative earth fault, or a short circuit between lines through the operation of a DC switch, various accident data occurring in the system can be extracted.

In addition, the step of analyzing the extracted fault voltage or fault current data (S50), and the step of determining the ground fault occurring in the DC power distribution system based on the analysis result of the fault voltage or fault current data (S60), and the analysis It may include a step (S70) of analyzing the accident energy for each power level based on the result. In other words, it is possible to determine the ground fault that actually occurs in the DC distribution system through the collection and analysis of the voltage and current measurement data of the accident.

In addition, the step of analyzing the data (S50) compares the fault voltage or fault current calculated through the data calculation step (S32) with the fault voltage or fault current data extracted through the system circuit, and compares It includes a step (S51) of analyzing the failure data when an accident occurs based on the result.

As described above, the DC grounding method integrated system configuration method and the simulation test apparatus 10 according to the embodiment of the present invention have the effect of securing the safety and reliability of the DC distribution grounding system through the system simulation test for each grounding method of the DC distribution. have. In addition, it is possible to derive the optimal grounding method of the specialized DC system based on the analysis result of the accident data, and it is possible to secure the test method of the DC grounding system integrated system.

In addition, it can be used as an educational facility for the training of inspection and inspection site personnel when introducing the KEC system and distributing DC power distribution facilities. In addition, through simulation tests and studies of various grounding system configurations using the DC grounding method integrated system configuration method of the present invention and the simulation test device 10, the safety evaluation items of the DC load machine and the system were derived, and the standard establishment and demonstration test facility infrastructure can be saved.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and can be easily changed by those of ordinary skill in the art to which the present invention pertains from the embodiments of the present invention and equivalent. Including all changes to the extent recognized as such.

10: DC grounding method integrated system configuration simulator
20: DC power 21: DC 3-wire power supply
22: DC 2-wire power supply 30: DC load
31: failure simulation switch 32: exposed conductive part
40: earthing part 41: system protective earthing
42: equipment protective earth 100: measuring part
110: ammeter 120: voltmeter
200: switching unit 201: first switch
202: first switch 203: third switch
204: fourth switch 205: fifth switch
206: sixth switch 207: seventh switch
208: eighth switch 209: ninth switch
210: tenth switch 211: eleventh switch
300: resistance unit 301: power resistance
302: positive terminal lead resistance 303: negative terminal lead conductor resistance
304: middle line conductor resistance 305: load side positive conductor resistance
306: load side protective conductor resistance 307: load side earth resistance
308: human body resistance 309: power-side grounding resistance
310: high impedance 311: human body current
400: control unit 500: calculation unit
600: voltage and current analysis unit 700: discrimination unit
800: storage unit 900: display unit

Claims (8)

The negative electrode of the DC 2-wire power source or the DC 3-wire power In the DC grounding method integrated system configuration method using a DC grounding integrated system configuration simulator in which the middle line is connected to the system protective ground through high impedance,
selecting a DC power supply method according to the presence or absence of an intermediate line (S10);
selecting a grounding method between system components (S20);
The control unit controls the DC switch according to the selected DC power method and grounding method to perform switch switching to configure a grid circuit between the DC power source and the DC load and the grid protective ground or facility protective ground (S30);
applying the selected DC power and extracting fault voltage or fault current data through a ground fault simulation of a DC load (S40);
analyzing the extracted fault voltage or fault current data (S50); and
Based on the analysis result of the fault voltage or fault current data, the fault energy for each power level is analyzed and the voltage and current measurement data of the accident are collected and analyzed to determine the ground fault occurring in the DC power distribution system (S60). but,
After performing the switch switching step (S30), extracting a simulation model of the DC grounding system integrated system configuration corresponding to the system circuit configured according to the DC power supply method and the DC system grounding method (S31), and the simulation Further comprising the step (S32) of calculating the fault voltage or fault current data appearing through the ground fault fault simulation of the DC load using the model,
The step of analyzing the data (S50) compares the fault voltage or fault current calculated through the data calculation step (S32) with the fault voltage or fault current data extracted through the system circuit, and compares the result of the comparison. DC grounding method integrated system configuration method, characterized in that it analyzes the failure data in the event of an accident based on it.
delete delete delete Depending on the presence or absence of the intermediate line of the DC power source and the grounding method of the DC system, the DC switch is switched so that the positive and negative terminals or the intermediate line terminal of the DC power are connected to at least one of the system protective ground, facility protective ground, and DC load. a switching unit;
a control unit configured to configure a system circuit for a simulation test by controlling the switching unit according to a preset DC power supply method and a grounding method of the DC system;
After the switching of the DC switch is performed by the control unit, a simulation model of the DC grounding method integrated system configuration corresponding to the grid circuit configured according to the DC power supply method and the DC system grounding method is derived, and the DC load using the simulation model a calculation unit for calculating fault voltage or fault current data appearing through ground fault simulation of
a voltage current analysis unit for comparing the fault voltage or fault current calculated value calculated through the calculation unit with the fault voltage or fault current data extracted through the system circuit, and analyzing the fault data when an accident occurs based on the comparison result; and
Based on the analysis result of the voltage and current analysis unit, it analyzes the energy of each power level and includes a determination unit for determining the ground fault occurring in the DC power distribution system through the collection and analysis of voltage and current measurement data of the accident,
The switching unit includes a first switch disposed between the negative terminal of the DC 3-wire power supply or the negative terminal of the DC 2-wire power supply and the grid protective ground, and a second switch disposed between the first switch and the grid protective ground and a high impedance for simulating the grounding method of the IT system is provided between the second switch and the system protective grounding,
The control unit is a DC power supply insulated from the earth or grounded to the earth through an impedance, and the negative electrode or DC 3 A DC grounding type integrated system configuration simulator, characterized in that the middle line of the wire power is connected to the system protective ground through high impedance.
delete 6. The method of claim 5,
The calculation unit uses the measurement data of the ammeter and the voltmeter and the simulation model to calculate the fault current (human current) flowing through the human body according to the grounding method of the DC system.
8. The method of claim 7,
The human body current is calculated using the following [Equation 1], a DC grounding method integrated system configuration simulation test apparatus.
[Equation 1]
- TT system (system):

- TN system:

- IT system:

,

,

Here, R ₀ is the power supply resistance, R _L1 is the positive terminal lead resistance, and R _L2 is the negative terminal lead resistance. Further, R _L3 is the intermediate line conductor resistance, R _C1 is the load side positive conductor resistance, and R _C2 is the load side protective conductor resistance. In addition, R _PE is the load-side grounding resistance, R _b is the human body resistance, and R _g is the power-side grounding resistance. In addition, R _H is a high impedance, and I _b is a human body current.

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