Low-voltage large-current test method for direct-current deicing device and portable current amplifying device

Abstract

The embodiment of the invention provides a low-voltage large-current test method for a direct-current deicing device and a portable current amplification device. The method comprises the following steps of: detaching a straight-through current transformer to be measured from a primary side through-flow copper bar of the direct-current ice melting device, and keeping the mutual inductor to be connected into a current measurement loop of the direct-current ice melting device; providing a portable current amplifying device, and connecting a plurality of turns of coils of the portable current amplifying device in series to form a test current path; enabling the series-connected multi-turn coils to penetrate into a center penetrating hole of the detached center penetrating type current transformer; the controller is used for supplying power to the current measuring loop and controlling the portable current amplifying device to output preset direct-current basic current; and determining an expected current value based on the direct-current basic current and the number of series turns of the multi-turn coil, and comparing a measured current value displayed by the direct-current ice melting device with the expected current value to check the accuracy of the current measurement loop.

Description

Technical Field

[0001] This application relates to the field of electrical engineering technology, specifically to a low-voltage high-current test method for a DC ice-melting device and a portable current amplification device. Background Technology

[0002] In recent years, my country has experienced frequent and severe snow and ice disasters. Icing on power transmission lines can easily lead to line breaks and pole collapses, seriously threatening the safe operation of the power grid and the reliability of power supply. DC de-icing is currently the only de-icing method with large-scale engineering applications. DC de-icing devices are generally only used during the winter icing period, energized only when de-icing lines, and de-energized at other times. The energization time is only a few dozen hours per year, making it impossible to monitor the status of conventional electrical equipment in real time through energized display systems. In particular, some mobile DC de-icing devices often experience voltage and current system failures during winter de-icing due to component vibrations during transportation, severely affecting on-site de-icing implementation. To minimize equipment failures during ice melting, routine maintenance is typically performed annually on the DC ice melting system. During this maintenance, simulated ice melting conditions are applied, with high voltage and low current, and low voltage and high current applied to test the voltage and current measurement circuits. The low voltage and high current test generally uses a large voltage regulator and a twelve-pulse rectifier transformer to convert the system's 380V test power supply before inputting it to the ice melting rectifier, ensuring each power element of the rectifier is conducting, and simultaneously testing the rectifier's current measurement system. While the power elements of the ice melting system itself are highly reliable and generally experience few failures, current measurement system failures are the most frequent occurrence during maintenance. Especially after maintenance, with the relocation of the mobile ice melting system, current measurement system failures often reappear during ice melting. However, the large voltage regulator and twelve-pulse rectifier transformer, weighing several tons, cannot be immediately used for on-site troubleshooting. This often leads to prolonged troubleshooting time, causing ice buildup and subsequent line breaks and tripping, rendering the DC ice melting system ineffective in preventing line collapse due to ice accumulation.

[0003] Therefore, it is urgent to study a new low-voltage, high-current test method for DC ice melting devices. Summary of the Invention

[0004] The purpose of this application is to provide a low-voltage, high-current test method and a portable current amplification device for a DC ice-melting device, aiming to solve the problem of difficulty in troubleshooting the current measurement system before ice melting in a DC ice-melting device, and to ensure the efficient operation of DC ice melting.

[0005] To achieve the above objectives, the first aspect of this application provides a low-voltage, high-current test method for a DC de-icing device, comprising: The current transformer to be tested is disconnected from the primary side current-carrying copper busbar of the DC ice-melting device of this application, while keeping the transformer connected to the current measurement circuit of the DC ice-melting device of this application. A portable current amplification device is provided, wherein a multi-turn coil of the portable current amplification device of this application is connected in series to form a test current path; The multi-turn coil of this application, which is connected in series, is inserted into the through hole of the disassembled through-hole current transformer; Power is supplied to the current measurement circuit of this application, and the portable current amplifier of this application is controlled to output a preset DC base current; The expected current value is determined based on the DC base current of this application and the number of series turns of the multi-turn coil of this application, and the measured current value displayed by the DC de-icing device of this application is compared with the expected current value of this application to verify the accuracy of the current measurement circuit of this application.

[0006] In this embodiment, the multi-turn coils are connected in series by connecting the positive and negative terminals of the portable current amplifier device to make the multi-turn coils of this application sequentially connected in series.

[0007] In this embodiment, the negative socket has N+1 first terminals, the positive socket has N+1 second terminals, and the multi-turn coil has N turns, where N is a natural number. The first end of the multi-turn coil is connected to the positive DC output of the portable current amplifier and connected to the N+1 terminal of the positive socket. The last end of the multi-turn coil is connected to the negative DC output of the portable current amplifier and connected to the first terminal of the negative socket. For the i-th turn, where i = 1, 2, …, N, one end of the i-th turn is connected to the (N+2-i)-th terminal of the positive socket and the other end is connected to the (N+2-i)-th terminal of the negative socket. When the positive socket and the negative socket are connected, the j-th terminal of the positive socket and the j-th terminal of the negative socket are connected accordingly, where j = 1, 2, …, N+1, thereby forming a series circuit with the N-turn coil.

[0008] In this embodiment of the application, N=20.

[0009] In this embodiment, the portable current amplification device includes a lightweight DC current generator for providing the DC base current of this application, and its rated output current is not less than 100A.

[0010] In this embodiment, the through-hole current transformer has a split structure, which can be detached from the primary current busbar by loosening the fasteners on both sides.

[0011] In this embodiment of the application, the method further includes: when the deviation between the measured current value and the expected current value exceeds the allowable range, checking and adjusting the components in the current measurement circuit of the application.

[0012] A second aspect of this application provides a portable current amplification device for calibrating the current measurement circuit of a DC ice-melting device, comprising: Lightweight DC current generator for providing adjustable DC base current; The negative socket has multiple first wiring terminals on it; The positive socket is provided with a number of second terminals that are the same as the number of first terminals of this application and can be connected one-to-one. The positive socket of this application can be detachably connected and engaged with the negative socket of this application. A multi-turn coil is connected between the negative socket and the positive socket of this application. The first and last ends of the multi-turn coil are respectively connected to the positive and negative DC output terminals of the lightweight DC current generator of this application. When the positive socket and the negative socket of this application are mated and engaged, the multi-turn coil forms a series circuit through the corresponding connection of the first terminal and the second terminal of this application.

[0013] In this embodiment, the negative socket has N+1 first terminals, the positive socket has N+1 second terminals, and the multi-turn coil has N turns, where N is a natural number. The first end of the multi-turn coil is connected to the positive terminal of the lightweight DC current generator and to the last second terminal of the positive socket. The last end of the multi-turn coil is connected to the negative terminal of the lightweight DC current generator and to the first first terminal of the negative socket. For the i-th turn of the coil, where i = 1, 2, …, N, one end of the turn is connected to the (N+2-i)-th second terminal of the positive socket and the other end is connected to the (N+2-i)-th first terminal of the negative socket.

[0014] In this embodiment, the multi-turn coil is wound with insulated copper wire with a cross-sectional area of ​​not less than 10 mm².

[0015] This solution uses a portable current amplifier to inject a known and precisely calculable analog high current signal into the key measuring component (through-hole current transformer) of the DC de-icing device in an offline state, thereby enabling rapid, closed-loop verification of the accuracy of the entire current measurement system and ensuring the rapid commencement of line de-icing.

[0016] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. In the drawings: Figure 1 A schematic diagram illustrating the low-voltage, high-current test method of a DC ice-melting device according to an embodiment of this application is shown. Figure 2A This illustration schematically shows an application scenario of the low-voltage, high-current test method for a DC ice-melting device according to an embodiment of this application. Figure 2B A schematic diagram of a negative socket and a positive socket according to an embodiment of this application is shown. Figure 3 A schematic diagram of a through-type current transformer structure according to an embodiment of this application is shown. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for illustration and explanation of the embodiments of this application and are not intended to limit the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0019] Figure 1 A schematic flowchart illustrating a low-voltage, high-current test method for a DC de-icing device according to an embodiment of this application is shown. Figure 1 As shown in one embodiment of this application, a low-voltage, high-current test method for a DC de-icing device is provided, comprising the following steps: Step 102: Disconnect the current transformer to be tested from the primary side current-carrying copper busbar of the DC de-icing device, while keeping the transformer connected to the current measurement circuit of the DC de-icing device. Step 104: Provide a portable current amplifier and connect the multi-turn coil of the portable current amplifier in series to form a test current path. Step 106: Insert the series-connected multi-turn coil into the through hole of the disassembled through-hole current transformer; Step 108: Power supply is supplied to the current measurement circuit, and the portable current amplifier is controlled to output a preset DC base current. Step 110: Determine the expected current value based on the DC base current and the number of series turns of the multi-turn coil, and compare the measured current value displayed by the DC de-icing device with the expected current value to verify the accuracy of the current measurement circuit.

[0020] A DC de-icing device refers to a specialized power equipment used to apply a large DC current to iced transmission lines, causing the lines to heat up and thus melting the ice. Its core components typically include a rectifier transformer, a rectifier (power element), and a measurement and control system. A through-hole current transformer is a sensor for measuring large currents. Its primary side (the side being measured) consists of a conductor (such as a copper busbar) passing through its central circular hole (through-hole), while the secondary side (output side) induces a proportionally reduced current signal for use by measuring instruments. In this embodiment, it can refer to a transformer used to measure the de-icing current. The primary side current-carrying copper busbar refers to the rectangular copper conductive busbar in the main power circuit of the DC de-icing device that carries the large de-icing current. The through-hole current transformer is mounted on this copper busbar to measure the current flowing through it. The current measurement circuit refers to the complete electrical path for current signal acquisition, transmission, and display, centered around the through-hole current transformer. It includes the secondary winding of the transformer, the power supply, signal lines, and the display meters on the DC de-icing device. The portable current amplification device is the dedicated testing equipment described in this application. Its core function is to input a small current and, through the series connection of multiple-turn coils, obtain a large current at the output terminal that is multiplied proportionally by the number of turns. It replaces the bulky voltage regulator and rectifier transformer used in traditional testing. The series connection of multiple-turn coils refers to the core structure of the portable current amplification device, where an insulated wire is repeatedly wound and connected between the positive and negative terminals to form a multi-turn (e.g., 20-turn) coil. When the positive and negative terminals are connected, these coils are automatically connected in series through the terminals. The DC base current refers to the original, unamplified current value directly output from the lightweight DC current generator (e.g., an adjustable DC power supply) inside the portable current amplification device. The expected current value is the theoretical current value calculated using a formula based on the DC base current and the number of turns (N) in the series connection of the multiple-turn coils during the verification test. This value should be consistent with the reading (measured current value) of the display meter of the DC de-icing device.

[0021] First, the current transformer under test (DUT) can be removed from its normal operating position (mounted on the current-carrying busbar). This disconnects the DUT from the main de-icing circuit, allowing it to be tested independently without activating the entire power section of the large de-icing device. Although physically removed from the main busbar, the secondary leads, power supply, and signal lines of the transformer remain fully connected to the DC de-icing device's control and measurement system. This means that the transformer, as a measurement sensor, is ready for testing with its power supply, signal channels, and display terminal in a "workable but no primary current input" state. Next, a portable test current source can be constructed. The core of this device is a DC base current output. This portable current amplifier innovatively uses an external multi-turn coil and specially designed positive and negative terminals. By connecting these two terminals, the multiple independent coils are automatically connected in series. The total resistance of the entire series circuit is approximately 20 times that of a single-turn coil, but because it is connected in series, the current flowing through each coil is the same, equal to the DC base current output by the power supply. Then, a simulated high current can be injected by inserting the series-connected multi-turn coil into the through-hole of the detached current transformer. This is a crucial step in connecting the test source and the object under test. The multi-turn coil, which has been connected in series to form a current bus, is passed entirely through the through-hole in the center of the transformer. From the perspective of electromagnetic induction, this is equivalent to inserting a current-carrying conductor into the transformer. Since the coils are connected in series, the current passing through the center of the transformer is equal to the total current flowing through the coils. This total current = DC base current × N (number of turns). For example, when the DC base current = 100A and N = 20, the current passing through the transformer is 2000A. Thus, a small device (outputting only 100A) simulates a virtual copper busbar carrying a 2000A current. Next, test excitation can be performed, i.e., powering the current measurement circuit and controlling the portable current amplifier to output the preset DC base current. First, power is supplied to the current measurement circuit of the DC de-icing device (including the secondary side of the transformer, display meters, etc.) to bring it into normal working condition. Then adjust the portable current amplifier to output a precise and stable DC base current I0 (e.g., 50A). This current flows through a series of multi-turn coils, generating an N×I0, for example, 20×50A=1000A, simulated large current magnetic field at the current transformer.

[0022] In one embodiment, the method further includes: if the deviation between the measured current value and the expected current value exceeds the allowable range, checking and adjusting the components in the current measurement circuit. Specifically, the measurement circuit of the ice-melting device can be checked according to the requirement that the displayed value of the current sensor should be 20 times the output value of the lightweight DC current generator. If the corresponding relationship is not met, the components of the measurement circuit are checked until the above standard is met, and the measurement circuit is checked to be normal.

[0023] Furthermore, data comparison and loop verification can be performed. Specifically, the expected current value is determined based on the DC base current and the number of turns in the multi-turn coil, and the measured current value displayed by the DC de-icing device is compared with the expected current value to verify the accuracy of the current measurement loop. The DC base current I0 can be read from the portable device, and then the theoretical current value to be measured, i.e., the expected current value, is calculated based on the known DC base current I0 and the fixed number of turns N in the coil series. The reading on the display meter of the DC de-icing device itself is then observed, which is the measured current value. This value is generated by the current transformer under test, transmitted through the entire current measurement loop, and displayed. The measured current value is compared with the expected current value. If they are consistent within the allowable error range, it proves that the entire current measurement loop from the current transformer to the display meter is functionally accurate and intact. Specifically, it proves that the current transformer itself, secondary wiring, signal processing unit, and meter in the current measurement loop are all functionally accurate and intact. If they are inconsistent, it clearly indicates that there is a fault or deviation in the loop, which needs to be investigated.

[0024] This solution utilizes a portable current amplifier to inject a known, precisely calculable analog high-current signal into the critical measuring component (through-hole current transformer) of the DC de-icing device in an offline state, thereby achieving rapid, closed-loop verification of the accuracy of the entire current measurement system. It can be seen that this solution eliminates the need for traditional voltage regulating and rectifying equipment weighing several tons; the entire testing device is lightweight and portable, allowing for rapid verification anytime, anywhere, ensuring the swift commencement of line de-icing. Furthermore, this solution directly and independently tests the most fault-prone current measurement system, enabling rapid and accurate problem localization and avoiding the complexity of traditional whole-system testing. Moreover, this solution operates under low voltage (e.g., <15V) and low current (e.g., 100A), amplifying the current effect through physical principles, ensuring testing effectiveness while significantly improving operational safety and avoiding potential risks to the main system of the de-icing device. In summary, this solution creatively combines the principle of "current series amplification" with the scenario of "offline transformer testing," forming a complete, self-consistent, and highly practical dedicated testing method.

[0025] In one embodiment, the multi-turn coils are connected in series by connecting the positive and negative terminals of the portable current amplifier, thereby making the multi-turn coils conduct sequentially.

[0026] In one embodiment, the negative socket has N+1 first terminals, the positive socket has N+1 second terminals, and the multi-turn coil has N turns, where N is a natural number. The first end of the multi-turn coil is connected to the positive DC output of the portable current amplifier and connected to the N+1th terminal of the positive socket. The last end of the multi-turn coil is connected to the negative DC output of the portable current amplifier and connected to the first terminal of the negative socket. For the i-th turn of the coil, where i = 1, 2, …, N, one end of the turn is connected to the (N+2-i)th terminal of the positive socket, and the other end is connected to the (N+2-i)th terminal of the negative socket. When the positive socket and the negative socket are connected, the j-th terminal of the positive socket is connected to the j-th terminal of the negative socket, where j = 1, 2, …, N+1, thereby forming a series circuit with the N-turn coil.

[0027] The negative and positive sockets are a pair of electrical connectors on the portable current amplifier that can be quickly connected and disconnected. The negative socket is usually associated with the negative output potential of the device, and the positive socket is associated with the positive output potential. They achieve circuit connection through mechanical snap-fit, and their core function is to automatically connect multiple independent coils into the required series circuit at the moment of connection. The first and second terminals refer to the metal conductive contacts installed on the "negative socket" and "positive socket," respectively. Each terminal is independently numbered and used to fix the lead wire of the connecting coil. When the sockets are connected, the two terminals with the same number will be physically connected. N+1 terminals refer to the minimum number of terminals required on each socket to achieve the series connection of N-turn coils. An N-turn coil has 2N wire ends and requires 2N connection points. Through clever wiring design, one wire end is directly connected to the positive power supply, one to the negative power supply, and the remaining 2N-2 wire ends are evenly distributed to the two sockets, with each socket requiring exactly N+1 terminals to receive them. For ease of description, the N-turn coils are numbered sequentially. The value 'i' can range from 1 to N, representing the nth coil segment in the current path from the negative to the positive terminal of the power supply. Understandably, the current starts from the positive terminal, must flow through each coil turn sequentially, and finally return to the negative terminal. The sockets and terminals are used to plan this "one-way street" for the current. First, the direct power connection terminals must be determined, including the beginning and end. The starting point (beginning) of the total coil path is directly connected to the positive terminal and anchored to the last terminal (N+1th terminal) of the positive socket. This is the total current inlet. The ending point (end) of the total coil path is directly connected to the negative terminal and anchored to the first terminal of the negative socket. This is the total current outlet. Next, the coil "shuttle" connection rules must be determined. Taking N=3 as an example, this means the portable current amplifier has 3 coil turns. For each intermediate coil turn (the i-th turn, i=1,2,3), it is connected to both the positive and negative sockets. The connection rule is as follows: one end of the i-th turn of the coil is connected to the (N+2-i)-th terminal of the positive socket; the other end is connected to the (N+2-i)-th terminal of the negative socket. When i=1 (the first turn with current flowing upwards), the coil is connected to the 4th (=3+2-1)-th terminal of the positive socket and the 4th terminal of the negative socket. When i=2, the coil is connected to the 3rd (=3+2-2)-th terminal of the positive socket and the 3rd terminal of the negative socket. When i=3, the coil is connected to the 2nd (=3+2-3)-th terminal of the positive socket and the 2nd terminal of the negative socket. This (N+2-i) rule ensures that the connection points of the coil on the two sockets are paired and arranged from high to low.

[0028] Then, the sockets can be mated to form a circuit. When the positive and negative sockets are mated, the terminals with the same number (terminal j) are shorted. At this time, the current path is automatically formed: positive power supply → positive socket terminal 4 → (mating) → negative socket terminal 4 → first turn of coil → positive socket terminal 3 → (mating) → negative socket terminal 3 → second turn of coil → positive socket terminal 2 → (mating) → negative socket terminal 2 → third turn of coil → positive socket terminal 1. This is the ideal situation; in reality, there may be deviations, so it needs to be checked.

[0029] According to the rules, the other end of the third coil should be connected to terminal 2 of the positive socket, not terminal 1. So how does the current flow back to the negative terminal? This is where the brilliance of the "N+1" terminal design in this solution lies: terminal 1 of the negative socket is left unused specifically for connecting to the power supply end (negative terminal). The actual path of the current is: ... → third coil → positive socket terminal 1 → (connection) → negative socket terminal 1 → negative power supply.

[0030] Specifically, taking N=20 as an example, the terminal numbers are 1-21. The specific details are as follows: The first end is connected to the positive power supply and terminal 21 of the positive socket, and the last end is connected to the negative power supply and terminal 1 of the negative socket.

[0031] The first coil turn: connects to the (20+2-1)=21st terminal of the positive and negative sockets (i.e., 221 to 321).

[0032] The second coil: connects to the (20+2-2)=20th terminal of the positive and negative sockets (i.e., 220 to 320).

[0033] …and so on… 20th turn of the coil: Connects to the (20+2-20)=2nd terminal of the positive and negative sockets (i.e., 202 to 302).

[0034] After docking, the current path is: positive terminal → positive 21 → negative 21 → coil 1 → positive 20 → negative 20 → coil 2 → ... → positive 2 → negative 2 → coil 20 → positive 1 → negative 1 → negative terminal.

[0035] In this application, the user only needs to perform one action—connecting the socket—to automatically complete the complex series connection of N-turn coils. The operation is simple and reliable, avoiding the error-prone problem of manually connecting multiple high-current wires in traditional methods. Furthermore, the connection logic is embedded in the wiring of the socket and coil. As long as manufacturing follows this rule, any connection will guarantee the formation of a correct series circuit, ensuring consistency and reliability in testing. Simultaneously, the N+1 terminal model has universality. Theoretically, by changing the number of coil turns N and the number of matching socket terminals, devices with different amplification factors (such as 1000A, 2000A, 3000A) can be flexibly designed, while the core principle remains unchanged.

[0036] After verifying the accuracy of the current measurement circuit, the coil can be removed, and the through-type current transformer can be returned to the current-carrying circuit and kept in a closed state to complete the low-voltage high-current test of the DC ice-melting device.

[0037] In one embodiment, N=20, meaning the portable current amplifier in this embodiment has 20 turns of coil, which are connected in series to form a test current path.

[0038] In one embodiment, the portable current amplification device includes a lightweight DC current generator for providing the DC base current, the rated output current of which is not less than 100A.

[0039] In one embodiment, the through-type current transformer has a split structure, which can be detached from the primary side current busbar by loosening the fasteners on both sides.

[0040] In this application, the DC ice-melting device can use a through-type current transformer. Before the test, the through-type current transformer is removed from the primary copper busbar to maintain the closed through-type structure and ensure normal power supply to the secondary circuit.

[0041] This application simplifies the low-voltage, high-current testing of DC de-icing devices. The testing equipment is small in size and lightweight, making it easy to carry. The test results are achieved through current amplification, significantly reducing the workload of verifying the current measurement circuit of the de-icing device, effectively saving preparation time for de-icing, and preventing tower collapse and wire breakage due to untimely de-icing. Due to the improved testing efficiency, each mobile de-icing device can be equipped with one convenient measuring device. After long-distance transportation, the de-icing current measurement circuit can be verified before each de-icing operation, avoiding inaccurate current measurements caused by transportation vibrations that could lead to wire burnout during de-icing, thus significantly improving the de-icing success rate. This application can also be used for routine maintenance and annual maintenance of DC de-icing devices, greatly improving maintenance efficiency.

[0042] In one embodiment, a portable current amplifier is provided for calibrating the current measurement circuit of a DC ice-melting device, comprising: Lightweight DC current generator for providing adjustable DC base current; The negative socket has multiple first wiring terminals on it; A positive terminal socket is provided with a number of second terminals that are the same as the number of the first terminals and can be connected one-to-one. The positive terminal socket can be detachably connected and engaged with the negative terminal socket. A multi-turn coil is connected between the negative socket and the positive socket, wherein the first end and the last end of the multi-turn coil are respectively connected to the positive and negative DC output terminals of the lightweight DC current generator; when the positive socket and the negative socket are mated and engaged, the multi-turn coil forms a series circuit through the corresponding connection of the first terminal and the second terminal.

[0043] In one embodiment, the negative socket has N+1 first terminals, the positive socket has N+1 second terminals, and the multi-turn coil has N turns, where N is a natural number. The first end of the multi-turn coil is connected to the positive terminal of the lightweight DC current generator and connected to the last second terminal of the positive socket. The end of the multi-turn coil is connected to the negative terminal of the lightweight DC current generator and connected to the first first terminal of the negative socket. For the i-th turn of the coil, where i = 1, 2, …, N, one end of the turn is connected to the (N+2-i)-th second terminal of the positive socket, and the other end is connected to the (N+2-i)-th first terminal of the negative socket.

[0044] In one embodiment, the multi-turn coil is wound with insulated copper wire with a cross-sectional area of ​​not less than 10 mm².

[0045] In one specific embodiment, see Figure 2AThis diagram illustrates an application scenario of a low-voltage, high-current testing method for a DC de-icing device provided in this application. Specifically, 1 is a lightweight DC current generator, 11 is an adjustment knob, 12 is a positive terminal, 13 is a negative terminal, 2 is a negative socket, 3 is a positive socket, and 4 is a coil. The lightweight DC current generator 1 can be a commercially available MS-1510D adjustable DC power supply with a rated output of 15V / 100A, an output voltage range of 0-15V, a current range of 0-100A, dimensions of 280×200×160mm, and a weight of 5kg. The output voltage or current can be adjusted via the knob on the panel, and its voltage and current regulation modes can be automatically switched. The negative socket 2 and positive socket 3 can use commercially available HDC-HE-024-M type aviation plugs with 24-pin terminals. Coil 4 is made of 10mm² insulated copper wire wound sequentially along the negative socket 2 and the positive socket 3 to form 20 turns of coil, with pre-reserved terminals for connection to the positive and negative terminals of an adjustable DC regulated power supply. The measurement circuit is now complete, and the device has the capability to output 20*I0=2000A of DC current.

[0046] refer to Figure 2B The diagram shows a schematic of the negative and positive terminals of this application. In this diagram, 2 is the negative terminal and 3 is the positive terminal. Terminals 201-211 correspond to the 21 negative terminals, and terminals 301-311 correspond to the 21 positive terminals. Figure 3 This is a schematic diagram of the through-type current transformer in this embodiment. The transformer adopts a split-type structure. 5 represents the upper coil of the through-type current transformer, 6 represents the lower coil, and 7 represents the current-carrying copper busbar. The through-type current transformer can be disassembled by unscrewing the screws on both sides of 5 and 6, thus removing it from the primary copper busbar. Coil 4 can then be inserted, and testing can begin.

[0047] In one embodiment, this application provides a low-voltage, high-current testing method for a DC ice-melting device, aiming to solve the problem of difficult troubleshooting of the current measurement system before ice melting in a DC ice-melting device, and to ensure the efficient operation of DC ice melting. The portable high-current generator used in the low-voltage, high-current testing method for the DC ice-melting device of this application includes the following components: a lightweight DC current generator 1, a negative socket 2, a positive socket 3, and a coil 4. The negative socket 2 includes 21 terminals, such as... Figure 2BAs shown, the terminals are 201, 202, 203...220, 221. The positive socket 3 includes 20 terminals, 301, 302, 303...320, 321. The positive and negative sockets are detachable and can be connected together. When connected, 201 connects to 301, 202 connects to 302, and so on, with 221 connecting to 321. The coil 4 includes 20 turns, each turn connected to one of the 21 terminals of the negative socket 2 and the other to the 21 terminals of the positive coil. The principle of the portable high-current generator is as follows: The first end of coil 4 is connected to the positive terminal 12 of lightweight DC current generator 1, and is connected to terminal 321 of positive socket 3 through the coil. After positive socket 3 and negative socket 2 are engaged, terminal 321 is connected to terminal 221. The coil is led out from terminal 221 and connected to terminal 320. At this time, the coil current flowing through the middle section between terminal 221 and terminal 320 is I0. After terminal 320 is engaged, it is connected to terminal 220. The coil is led out from terminal 220 and connected to terminal 319. The coil current flowing through the middle section between terminal 220 and terminal 319 is also I0. And so on, the coil current flowing through the middle section between terminal 219 and terminal 318 is I0, ..., the coil current flowing through the middle section between terminal 202 and terminal 301 is I0. After terminal 301 is engaged, it is connected to terminal 201. Terminal 201 is connected to the negative terminal 13 of lightweight DC current generator 1 through the end of coil 4, forming a complete current loop. The output current I0 of the lightweight DC current generator can be obtained by combining 20 turns of the coil. If the output current of the lightweight DC current generator 1 is 100A, the device can generate 2000A DC current. It can be used to verify the current measurement system of the DC ice melting device and to troubleshoot faults in a timely manner.

[0048] The low-voltage, high-current test method for the DC de-icing device of this application includes the following steps: DC de-icing devices generally use through-type current transformers. Before the test, the through-type current transformer is removed from the primary copper busbar, maintaining the closed through-type structure and ensuring normal power supply to the secondary circuit.

[0049] The lead portion of the coil 4 used to connect the positive terminal socket 3 and the negative terminal socket 2 is inserted between the current transformers, replacing the original position of the copper busbar.

[0050] Start the secondary power supply of the ice-melting device to provide driving voltage to the through-type current transformer.

[0051] Adjust knob 11 of the lightweight DC current generator 1 to gradually increase the output current, and observe the current value of the corresponding current sensor on the display meter of the ice melting device.

[0052] The current sensor reading should be 20 times the output value of the lightweight DC current generator 1. The measurement circuit of the ice melting device should be checked. If the corresponding relationship is not met, check each component of the measurement circuit until the above standard is met and the measurement circuit is checked to be normal.

[0053] Remove the coil 4, restore the through-type current transformer to the vicinity of the primary copper busbar, keep it in a closed state, and complete the low-voltage high-current test of the DC ice melting device.

[0054] The beneficial effects achieved by this application include: (1) It realizes the convenience of low-voltage high-current test of DC de-icing device. The test equipment is small in size and light in weight, easy to carry. The test effect is achieved by current amplification, which greatly reduces the workload of current measurement circuit verification of de-icing device, effectively saves de-icing preparation time, and avoids tower collapse and line breakage due to untimely de-icing.

[0055] (2) Due to the improved test efficiency, each mobile ice melting device can be equipped with a convenient measuring device. After long-distance transportation, the ice melting current measurement circuit is checked before each ice melting to avoid faults such as burnt wires during ice melting caused by inaccurate current measurement due to transportation vibration, thus significantly improving the success rate of ice melting.

[0056] (3) The device can also be used for routine maintenance and annual maintenance of DC ice melting devices, greatly improving the maintenance efficiency of ice melting devices.

[0057] Figure 1 This is a flowchart illustrating a low-voltage, high-current test method for a DC de-icing device in one embodiment. It should be understood that, although... Figure 1 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise explicitly stated herein, there is no strict order in which these steps are executed, and they can be performed in other orders. Figure 1 At least some steps in the process may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but may be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but may be executed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps. Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0058] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0059] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. The above are merely embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A low-voltage high-current test method for a direct-current de-icing device, characterized in that, The method comprises the following steps: disconnecting a to-be-tested toroidal current transformer from a primary side through-flow copper bar of the DC de-icing device, and keeping the to-be-tested toroidal current transformer connected to a current measurement circuit of the DC de-icing device; providing a portable current amplification device, and connecting multiple turns of coils of the portable current amplification device in series to form a test current path; inserting the multiple turns of coils into a through hole of the disconnected toroidal current transformer; supplying power to the current measurement circuit, and controlling the portable current amplification device to output a preset DC base current; determining an expected current value based on the DC base current and the number of turns of the multiple turns of coils, and comparing a measured current value displayed by the DC de-icing device with the expected current value to check the accuracy of the current measurement circuit.

2. The method of claim 1, wherein, The multiple turns of coils are connected in series by connecting a positive pole socket and a negative pole socket of the portable current amplification device to make the multiple turns of coils connected in series in turn.

3. The method of claim 2, wherein, The negative pole socket is provided with N+1 first connecting terminals, the positive pole socket is provided with N+1 second connecting terminals, and the multiple turns of coils are N turns, where N is a natural number. A first end of the multiple turns of coils is connected to a DC output positive pole of the portable current amplification device and connected to an N+1 terminal of the positive pole socket, and a last end of the multiple turns of coils is connected to a DC output negative pole of the portable current amplification device and connected to a 1 terminal of the negative pole socket. For the i-th turn of coil, where i=1, 2, …, N, one end of the i-th turn of coil is connected to a (N+2-i) terminal of the positive pole socket, and the other end of the i-th turn of coil is connected to a (N+2-i) terminal of the negative pole socket. When the positive pole socket is connected to the negative pole socket, a j terminal of the positive pole socket is connected to a j terminal of the negative pole socket, where j=1, 2, …, N+1, so that the N turns of coils form a series circuit.

4. The method of claim 3, wherein, N=20.

5. The method of claim 1, wherein, The portable current amplification device comprises a light DC current generator configured to provide the DC base current, and the rated output current of the light DC current generator is not less than 100 A.

6. The method of claim 1, wherein, The toroidal current transformer has a split structure, and is disconnected from the primary side through-flow copper bar by loosening fixing members on both sides of the toroidal current transformer.

7. The method of claim 1, wherein, The method further comprises the following steps: In a case where a deviation between the measured current value and the expected current value exceeds an allowable range, checking and adjusting components in the current measurement circuit.

8. A portable current amplifying device for checking the current measurement loop of a direct current de-icing device, characterized in that The method comprises the following steps: providing a light DC current generator configured to provide an adjustable DC base current; a negative pole socket provided with a plurality of first connecting terminals; a positive pole socket provided with a plurality of second connecting terminals which are the same in number as the first connecting terminals and can be connected one by one, and the positive pole socket can be detachably connected to the negative pole socket; a plurality of turns of coils connected between the negative pole socket and the positive pole socket, where a first end and a last end of the turns of coils are connected to a DC output positive pole and a DC output negative pole of the light DC current generator, respectively; and when the positive pole socket is connected to the negative pole socket, the turns of coils form a series circuit through corresponding connection of the first connecting terminals and the second connecting terminals.

9. The portable current amplification device of claim 8, wherein, The negative pole socket is provided with N+1 first connecting terminals, the positive pole socket is provided with N+1 second connecting terminals, and the multi-turn coil has N turns, where N is a natural number; a first end of the multi-turn coil is connected to a positive pole of the light DC current generator and connected to a last second connecting terminal of the positive pole socket; and a second end of the multi-turn coil is connected to a negative pole of the light DC current generator and connected to a first first connecting terminal of the negative pole socket. For the i-th turn coil, where i = 1, 2, …, N, one end of the i-th turn coil is connected to a (N+2-i)th second connecting terminal of the positive pole socket, and the other end of the i-th turn coil is connected to a (N+2-i)th first connecting terminal of the negative pole socket.

10. The portable current amplification device of claim 9, wherein, The multi-turn coil is wound by an insulated copper wire with a cross-sectional area not less than 10 mm2.

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