Control method, controller, fault location diagnosis method, device and system

Abstract

The present invention provides a control method, a controller, a fault location diagnosis method, a device and a system. The control method includes: receiving a voltage from an energy-taking power supply device; judging whether the voltage is greater than a first preset value; when the voltage is greater than the first preset value, outputting the voltage from the energy-taking power supply device to a collection device to start the collection device. The present invention can reduce the starting voltage of the fault location diagnosis device, and improve the adaptability and reliability of the fault location diagnosis device.

Description

Technical Field

[0001] The present invention relates to the field of electric power, and in particular to a control method, a controller, a fault location and diagnosis method, a device and a system. Background Art

[0002] As the scale of the power system continues to expand, the number of high-voltage long-distance overhead transmission lines is increasing. As the link of energy transmission, the transmission line is the connection line between various large power systems, and it is also the basis for the safe and stable operation of the entire system. Once a fault occurs on the transmission line, the fault point must be found as soon as possible, the fault must be eliminated, and power supply must be restored. However, since high-voltage and ultra-high-voltage transmission lines are often exposed to different environments and distributed in a large geographical area, the operating environment is harsh (such as steep mountainous areas, poor geology, severe cold climate, difficult transportation, etc.), therefore, it is also the place where the most faults occur in the power system. Quickly and accurately finding the fault point after a line fault is not only important for timely repairing the line and quickly restoring power supply, but also for the safe, stable and economical operation of the entire power system.

[0003] The fault location diagnosis device is a device for online determination of the location of the fault point of the transmission line. It can not only quickly and accurately determine the fault point according to different fault characteristics, improve the fault location accuracy and thus improve the efficiency of fault line inspection, but also capture the transient fault traveling wave waveform, and intelligently identify whether the fault is a lightning fault or a non-lightning fault, and whether the lightning fault is a bypass strike or a counterattack. The fault location diagnosis device can not only help to repair the fault line in time, ensure the safe and stable operation of the entire power grid, and reduce the economic losses caused by the transmission line fault, but also save a lot of manpower and material resources for line inspection, and reduce the heavy physical labor of line inspection personnel. It technically ensures the safe, stable and economic operation of the power grid, and has huge social and economic benefits.

[0004] The starting voltage of the existing fault location diagnosis device is too high, which causes the fault location diagnosis device in some areas to be frequently disconnected and unable to work and be used normally. Summary of the invention

[0005] The main purpose of the embodiments of the present invention is to provide a control method, a controller, a fault location diagnosis method, a device and a system to reduce the starting voltage of the fault location diagnosis device and improve the adaptability and reliability of the fault location diagnosis device.

[0006] In order to achieve the above object, an embodiment of the present invention provides a control method, including:

[0007] Receiving voltage from an energy-taking power supply device;

[0008] Determining whether the voltage is greater than a first preset value;

[0009] When the voltage is greater than a first preset value, the voltage from the energy extraction power supply device is output to the collection device to start the collection device.

[0010] An embodiment of the present invention further provides a controller, including:

[0011] A receiving module, used for receiving a voltage from an energy-taking power supply device;

[0012] A judging module, used to judge whether the voltage is greater than a first preset value;

[0013] The voltage output module is used to output the voltage from the energy-taking power supply device to the collection device to start the collection device.

[0014] The embodiment of the present invention further provides a fault location diagnosis device connected to an energy-taking power supply device, comprising:

[0015] A controller connected to the energy-taking power supply device, a collection device connected to the controller, and a communication device connected to the controller;

[0016] The controller is used to: receive the voltage from the energy-taking power supply device, determine whether the voltage is greater than a first preset value, and when the voltage is greater than the first preset value, output the voltage to the collection device to start the collection device;

[0017] The acquisition device is used to: collect the fault traveling wave current and send the fault traveling wave current to the controller;

[0018] The controller is also used to: receive the fault traveling wave current, and output the fault position to the communication device according to the fault traveling wave current;

[0019] The communication device is used to receive the fault location and send the fault location to an external device.

[0020] The embodiment of the present invention further provides a fault location diagnosis system, including:

[0021] The fault location diagnosis device as described above, an energy extraction power supply device connected to the fault location diagnosis device, and an energy extraction transformer connected to the energy extraction power supply device;

[0022] The energy-taking transformer is used to obtain current from the transmission line, convert the current into voltage, and output the voltage to the energy-taking power supply device;

[0023] The energy-taking power supply device is used to convert voltage and output the converted voltage to the fault location diagnosis device.

[0024] In one embodiment, the energy-taking power supply device comprises:

[0025] A rectifier and filter device, used for rectifying and filtering the voltage;

[0026] A power-taking regulating protection circuit connected to the rectifying and filtering device is used to determine whether the voltage after rectification and filtering is greater than a second preset value; when the voltage after rectification and filtering is greater than the second preset value, the voltage value of the voltage is reduced to the second preset value;

[0027] The isolation voltage stabilization device connected to the power taking regulation protection circuit is used to isolate and stabilize the voltage passing through the power taking regulation protection circuit, and output the isolated and stabilized voltage to the fault location diagnosis device.

[0028] The embodiment of the present invention also provides a fault location diagnosis method, including:

[0029] The energy-taking transformer obtains current from the transmission line, converts the current into voltage, and outputs the voltage to the energy-taking power supply device;

[0030] The energy-taking power supply device converts the voltage and outputs the converted voltage to a controller in the fault location diagnosis device;

[0031] The controller receives a voltage from the energy-taking power supply device; determines whether the voltage is greater than a first preset value; when the voltage is greater than the first preset value, outputs the voltage from the energy-taking power supply device to the collection device, so that the collection device is started;

[0032] The acquisition device acquires the fault traveling wave current and sends the fault traveling wave current to the controller;

[0033] The controller receives the fault traveling wave current and outputs the fault position to the communication device according to the fault traveling wave current;

[0034] The communication device receives the fault location and sends the fault location to an external device.

[0035] In one embodiment, the energy-taking power supply device converts the voltage and outputs the converted voltage to a controller in the fault location diagnosis device, specifically including:

[0036] The rectifier and filter device performs rectification and filtering on the voltage;

[0037] The power-taking regulating protection circuit determines whether the voltage after rectification and filtering is greater than a second preset value; when the voltage after rectification and filtering is greater than the second preset value, the voltage value of the voltage is reduced to the second preset value;

[0038] The isolation voltage stabilization device isolates and stabilizes the voltage passing through the power-taking regulation protection circuit, and outputs the isolated and stabilized voltage to the fault location diagnosis device.

[0039] The embodiment of the present invention further provides a fault location diagnosis system, including:

[0040] The fault location diagnosis device as described above, an energy extraction power supply device connected to the fault location diagnosis device, and an energy extraction transformer connected to the energy extraction power supply device;

[0041] The energy-taking transformer is used to obtain current from the transmission line, convert the current into voltage, and output the voltage to the energy-taking power supply device;

[0042] The energy-taking power supply device is used to convert the voltage and output the converted voltage to the fault location diagnosis device;

[0043] The energy-taking transformer comprises: an iron core support, two iron cores arranged opposite to each other on the iron core support, and a coil wound around the two iron cores.

[0044] In one embodiment, the wire diameter of the coil is 0.2 mm, and the number of turns of the coil is 300.

[0045] The control method, controller, fault location diagnosis method, device and system of the embodiments of the present invention can reduce the starting voltage of the fault location diagnosis device, and improve the adaptability and reliability of the fault location diagnosis device. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 is a flow chart of a control method in an embodiment of the present invention;

[0048] Figure 2 is a structural block diagram of a controller in an embodiment of the present invention;

[0049] Figure 3 is a structural block diagram of a fault location and diagnosis device in an embodiment of the present invention;

[0050] Figure 4 is a structural block diagram of a fault location diagnosis system in an embodiment of the present invention;

[0051] Figure 5 It is a structural block diagram of an energy-taking power supply device in an embodiment of the present invention;

[0052] Figure 6 is a flow chart of a fault location and diagnosis method according to an embodiment of the present invention;

[0053] Figure 7 is a flow chart of S202 in an embodiment of the present invention;

[0054] Figure 8 It is a partial schematic diagram of the energy taking transformer in an embodiment of the present invention. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] In view of the fact that the startup voltage of the current fault location diagnosis device is too high, which causes the fault location diagnosis device in some areas to be frequently disconnected and unable to work and be used normally, an embodiment of the present invention provides a control method to reduce the startup voltage of the fault location diagnosis device and improve the adaptability and reliability of the fault location diagnosis device. The present invention is described in detail below with reference to the accompanying drawings.

[0057] Figure 1 is a flow chart of the control method in an embodiment of the present invention. Figure 1 As shown, the control method includes:

[0058] S101: receiving a voltage from an energy-taking power supply device.

[0059] S102: Determine whether the voltage is greater than a first preset value.

[0060] S103: When the voltage is greater than a first preset value, the voltage from the energy extraction power supply device is output to the collection device to start the collection device.

[0061] The execution subject of the present invention may be a controller. Figure 1 As can be seen from the process shown, the present invention first receives the voltage from the energy supply device, and then determines whether the voltage is greater than a first preset value; when the voltage is greater than the first preset value, the voltage from the energy supply device is output to the acquisition device, so that the acquisition device is started, and the fault location diagnosis device can be powered on step by step, thereby reducing the starting voltage of the fault location diagnosis device and improving the adaptability and reliability of the fault location diagnosis device.

[0062] Based on the same inventive concept, an embodiment of the present invention further provides a controller. Figure 2 is a block diagram of the controller in an embodiment of the present invention. Figure 2 As shown, the controller includes:

[0063] A receiving module, used for receiving a voltage from an energy-taking power supply device;

[0064] A judging module, used to judge whether the voltage is greater than a first preset value;

[0065] The voltage output module is used to output the voltage from the energy-taking power supply device to the collection device to start the collection device.

[0066] The controller of the embodiment of the present invention first receives the voltage from the energy-taking power supply device, and then determines whether the voltage is greater than a first preset value; when the voltage is greater than the first preset value, the voltage from the energy-taking power supply device is output to the acquisition device, so that the acquisition device is started, and the fault location diagnosis device can be powered on step by step, thereby reducing the starting voltage of the fault location diagnosis device and improving the adaptability and reliability of the fault location diagnosis device.

[0067] Based on the same inventive concept, an embodiment of the present invention further provides a fault location diagnosis device connected to an energy extraction power supply device. Figure 3 is a structural block diagram of a fault location and diagnosis device in an embodiment of the present invention. Figure 3 As shown, the fault location diagnosis device includes:

[0068] A controller connected to the energy-taking power supply device, a collection device connected to the controller, and a communication device connected to the controller;

[0069] The controller is used to: receive the voltage from the energy-taking power supply device, determine whether the voltage is greater than a first preset value, and when the voltage is greater than the first preset value, output the voltage to the collection device to start the collection device.

[0070] The acquisition device is used to: collect the fault traveling wave current and send the fault traveling wave current to the controller;

[0071] The controller is also used to: receive the fault traveling wave current, and output the fault position to the communication device according to the fault traveling wave current;

[0072] The communication device is used to receive the fault location and send the fault location to an external device.

[0073] During specific implementation, the process of the embodiment of the present invention is as follows:

[0074] 1. The controller receives the voltage from the energy-taking power supply device and outputs the voltage to the communication device to start the communication device.

[0075] 2. The controller determines whether the voltage is greater than a first preset value. When the voltage is greater than the first preset value, the controller outputs the voltage to the acquisition device to start the acquisition device. Otherwise, the voltage is prevented from being output to the acquisition device. Even if the acquisition device is not started, the started communication device will upload the online status of the fault location diagnosis device to the external device. When the received starting voltage is insufficient, the fault location diagnosis device can still be online, thereby ensuring the online rate of the fault location diagnosis device.

[0076] 3. After the acquisition device is started, the fault traveling wave current is collected and sent to the controller. The controller receives the fault traveling wave current and outputs the fault position to the communication device according to the fault traveling wave current. The communication device receives the fault position and sends the fault position to the external device. The controller can use the AT91SAM9G20B chip.

[0077] The controller in the fault location diagnostic device of the embodiment of the present invention receives the voltage from the energy supply device, and determines whether the voltage is greater than a first preset value; when the voltage is greater than the first preset value, the voltage from the energy supply device is output to the acquisition device, so that the acquisition device is started; the acquisition device collects and sends the fault traveling wave current to the controller, and the controller then outputs the fault position to the communication device according to the fault traveling wave current; the communication device receives and sends the fault position to the external equipment, which can enable the fault location diagnostic device to be powered on step by step, reduce the starting voltage of the fault location diagnostic device, and improve the adaptability and reliability of the fault location diagnostic device.

[0078] Based on the same inventive concept, an embodiment of the present invention further provides a fault location diagnosis system. Figure 4 FIG. 1 is a structural block diagram of a fault location diagnosis system in an embodiment of the present invention. Figure 4 As shown, the fault location diagnosis system includes:

[0079] The fault location diagnosis device as described above, an energy extraction power supply device connected to the fault location diagnosis device, and an energy extraction transformer connected to the energy extraction power supply device;

[0080] The energy-taking transformer is used to obtain current from the transmission line, convert the current into voltage, and output the voltage to the energy-taking power supply device;

[0081] The energy-taking power supply device is used to convert voltage and output the converted voltage to the fault location diagnosis device.

[0082] Figure 5 is a structural block diagram of the energy-taking power supply device in an embodiment of the present invention. Figure 5 As shown, the energy-taking power supply device includes:

[0083] The rectifier and filter device is used for rectifying and filtering the voltage.

[0084] The power-taking regulating protection circuit connected to the rectifier and filter device is used to determine whether the voltage after rectification and filtering is greater than the second preset value; when the voltage after rectification and filtering is greater than the second preset value, the voltage value of the voltage is reduced to the second preset value. For example, when the fault location diagnosis system is struck by lightning, a large voltage will be caused instantly. The power-taking regulating protection circuit can adjust and limit the voltage output by the energy-taking power supply device in real time to avoid burning the fault location diagnosis device.

[0085] The isolation voltage stabilization device connected to the power taking regulation protection circuit is used to isolate and stabilize the voltage passing through the power taking regulation protection circuit, and output the isolated and stabilized voltage to the fault location diagnosis device.

[0086] The energy-taking power supply device in the fault location diagnosis system of the embodiment of the present invention has the following working modes:

[0087] 1. Standby mode: When the current on the transmission line is very small, causing the voltage converted by the energy transformer to be very small, and even unable to provide the voltage required to start the fault location diagnosis device, the energy power supply device will be in standby mode and will not output power.

[0088] 2. Intermittent working mode: When the current on the transmission line increases to a certain value, so that the voltage converted by the energy-taking transformer can support the startup of the controller and communication device in the fault location diagnosis device, but is not enough to support the normal operation of the acquisition device, the energy-taking power supply device will be in an intermittent working state, and intermittently output power to the fault location diagnosis device. At this time, the output voltage value of the energy-taking power supply device is a square wave with a jump change of the rated output voltage and zero volts.

[0089] 3. Normal working mode: When the current on the transmission line is large enough so that the voltage converted by the energy transformer can support the operation of the fault location diagnosis device, the energy power supply device normally outputs the power required by the fault location diagnosis device and limits the maximum voltage input to the fault location diagnosis device. The energy power supply device will not output abnormal voltage values ​​other than the rated output voltage and zero volts in all working modes to ensure the safe operation of the fault location diagnosis device.

[0090] The energy-taking transformer in the fault location and diagnosis system of the embodiment of the present invention obtains current from the transmission line, converts the current into voltage, and outputs the voltage to the energy-taking power supply device; the energy-taking power supply device converts the voltage and outputs the converted voltage to the fault location and diagnosis device, which can enable the fault location and diagnosis device to be powered on step by step, reduce the starting voltage of the fault location and diagnosis device, and improve the adaptability and reliability of the fault location and diagnosis device.

[0091] Based on the same inventive concept, an embodiment of the present invention further provides a fault location and diagnosis method. Figure 6 FIG. 1 is a flow chart of a fault location and diagnosis method according to an embodiment of the present invention. Figure 6 As shown, the fault location diagnosis method includes:

[0092] S201: The energy-taking transformer obtains current from the transmission line, converts the current into voltage, and outputs the voltage to the energy-taking power supply device.

[0093] S202: The energy-taking power supply device converts the voltage and outputs the converted voltage to a controller in the fault location diagnosis device.

[0094] S203: The controller receives a voltage from the energy extraction power supply device; determines whether the voltage is greater than a first preset value; when the voltage is greater than the first preset value, outputs the voltage from the energy extraction power supply device to the collection device to start the collection device.

[0095] S204: The collection device collects the fault traveling wave current and sends the fault traveling wave current to the controller.

[0096] S205: The controller receives the fault traveling wave current, and outputs the fault position to the communication device according to the fault traveling wave current;

[0097] S206: The communication device receives the fault location and sends the fault location to an external device.

[0098] The energy-taking transformer in the fault location and diagnosis method of the embodiment of the present invention obtains current from the transmission line, converts the current into voltage, and outputs the voltage to the energy-taking power supply device; the energy-taking power supply device converts the voltage, and outputs the converted voltage to the controller in the fault location and diagnosis device; the controller determines whether the voltage is greater than a first preset value; when the voltage is greater than the first preset value, the voltage from the energy-taking power supply device is output to the collection device to start the collection device; the collection device collects and sends the fault traveling wave current to the controller; the fault position is output to the communication device according to the fault traveling wave current; the communication device receives and sends the fault position to the external device, which can enable the fault location and diagnosis device to be powered on step by step, reduce the starting voltage of the fault location and diagnosis device, and improve the adaptability and reliability of the fault location and diagnosis device.

[0099] Figure 7 is a flow chart of S202 in an embodiment of the present invention. Figure 7 As shown, S202 specifically includes:

[0100] S301: The rectifying and filtering device performs rectification and filtering on the voltage.

[0101] S302: The power regulation protection circuit determines whether the voltage after rectification and filtering is greater than a second preset value; when the voltage after rectification and filtering is greater than the second preset value, the voltage value of the voltage is reduced to the second preset value.

[0102] S303: The isolation and voltage stabilization device isolates and stabilizes the voltage that has passed through the power-taking regulation and protection circuit, and outputs the isolated and voltage-stabilized voltage to the fault location and diagnosis device.

[0103] Based on the same inventive concept, an embodiment of the present invention further provides a fault location diagnosis system. Figure 8 FIG. 1 is a partial schematic diagram of an energy transformer in an embodiment of the present invention. Figure 8 As shown, the fault location diagnosis system includes:

[0104] The fault location diagnosis device as described above, an energy extraction power supply device connected to the fault location diagnosis device, and an energy extraction transformer connected to the energy extraction power supply device;

[0105] The energy-taking transformer is used to obtain current from the transmission line, convert the current into voltage, and output the voltage to the energy-taking power supply device;

[0106] The energy-taking power supply device is used to convert the voltage and output the converted voltage to the fault location diagnosis device;

[0107] The energy-taking transformer includes: an iron core support 802, two iron cores 801 arranged opposite to each other on the iron core support, and a coil wound around the two iron cores.

[0108] In one embodiment, the wire diameter of the coil is 0.2 mm, and the number of turns of the coil is 300.

[0109] The energy taking transformer in the fault location diagnosis system of the embodiment of the present invention adopts two iron cores, which increases the contact area of ​​the cross-section of the iron core, balances the weight, and facilitates installation; it also adopts a smaller coil wire diameter and more coil turns, which can meet the low starting voltage requirement of the fault location diagnosis device, provide optimal power supply performance, enable the fault location diagnosis device to be powered on step by step, reduce the starting voltage of the fault location diagnosis device, and improve the adaptability and reliability of the fault location diagnosis device.

[0110] In summary, the control method, controller, fault location diagnosis method, device and system of the embodiments of the present invention can reduce the starting voltage of the fault location diagnosis device, and improve the adaptability and reliability of the fault location diagnosis device.

[0111] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fault location diagnosis device connected to an energy-taking power supply device, characterized in that: include: A controller connected to the energy extraction power supply device, a collection device connected to the controller, and a communication device connected to the controller; The controller is used to: receive a voltage from an energy-taking power supply device, determine whether the voltage is greater than a first preset value, and when the voltage is greater than the first preset value, output the voltage to a collection device to start the collection device; The acquisition device is used to: acquire fault traveling wave current and send the fault traveling wave current to the controller; The controller is also used to: receive the fault traveling wave current, and output the fault position to the communication device according to the fault traveling wave current; The communication device is used to: receive the fault location, and send the fault location to an external device; The communication device is also used for: in response to the acquisition device not being started, uploading the online status of the fault location diagnosis device to an external device, so that the fault location diagnosis device is still in an online state.

2. A fault location diagnosis system, characterized in that: include: The fault location diagnosis device according to claim 1, an energy extraction power supply device connected to the fault location diagnosis device, and an energy extraction transformer connected to the energy extraction power supply device; The energy-taking transformer is used to obtain current from the transmission line, convert the current into voltage, and output the voltage to the energy-taking power supply device; The energy-taking power supply device is used to convert the voltage and output the converted voltage to the fault location diagnosis device.

3. The fault location diagnosis system according to claim 2, characterized in that: The energy-taking power supply device comprises: A rectifying and filtering device, used for rectifying and filtering the voltage; A power-taking regulating protection circuit connected to the rectifying and filtering device is used to determine whether the voltage after rectification and filtering is greater than a second preset value; when the voltage after rectification and filtering is greater than the second preset value, the voltage value of the voltage is reduced to the second preset value; The isolation and voltage stabilization device connected to the power taking, regulating and protecting circuit is used to isolate and stabilize the voltage passing through the power taking, regulating and protecting circuit, and output the isolated and stabilized voltage to the fault location and diagnosis device.

4. A fault location diagnosis method, characterized in that: include: The energy-taking transformer obtains current from the transmission line, converts the current into voltage, and outputs the voltage to the energy-taking power supply device; The energy-taking power supply device converts the voltage and outputs the converted voltage to a controller in the fault location diagnosis device; The controller receives a voltage from the energy extraction power supply device; and determines whether the voltage is greater than a first preset value; When the voltage is greater than a first preset value, the voltage from the energy extraction power supply device is output to the collection device to start the collection device; The acquisition device acquires the fault traveling wave current and sends the fault traveling wave current to the controller; The controller receives the fault traveling wave current, and outputs the fault position to the communication device according to the fault traveling wave current; The communication device receives the fault location and sends the fault location to an external device; In response to the acquisition device not being started, the communication device uploads the online status of the fault location diagnosis device to the external device, so that the fault location diagnosis device is still in the online state.

5. The fault location diagnosis method according to claim 4, characterized in that: The energy-taking power supply device converts the voltage and outputs the converted voltage to a controller in the fault location diagnosis device, specifically including: The rectifying and filtering device performs rectification and filtering on the voltage; The power-taking regulation protection circuit determines whether the voltage after rectification and filtering is greater than a second preset value; when the voltage after rectification and filtering is greater than the second preset value, the voltage value of the voltage is reduced to the second preset value; The isolation and voltage stabilization device isolates and stabilizes the voltage passing through the power-taking regulation and protection circuit, and outputs the isolated and voltage-stabilized voltage to the fault location and diagnosis device.

6. A fault location diagnosis system, characterized in that: include: The fault location diagnosis device according to claim 1, an energy extraction power supply device connected to the fault location diagnosis device, and an energy extraction transformer connected to the energy extraction power supply device; The energy-taking transformer is used to obtain current from the transmission line, convert the current into voltage, and output the voltage to the energy-taking power supply device; The energy-taking power supply device is used to convert the voltage and output the converted voltage to the fault location diagnosis device; The energy-taking transformer comprises: an iron core support, two iron cores arranged opposite to each other on the iron core support, and coils wound on the two iron cores.

7. The fault location diagnosis system according to claim 6, characterized in that: The wire diameter of the coil is 0.2 mm, and the number of turns of the coil is 300.

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