Built-in acetylene detection and protection device and working method of high voltage cable oil-filled terminal

Abstract

The present invention proposes a built-in acetylene detection and protection device and a working method for a high-voltage cable oil-filled terminal, which is characterized by being encapsulated inside the high-voltage cable oil-filled terminal, comprising: a micro-circulation pump, a circulating insulating oil channel, a jacket circulation pipe, an acetylene selective permeation membrane, an acetylene detector and a micro-electromagnetic valve; the jacket circulation pipe sleeve is arranged outside the circulating insulating oil channel to form a jacket interlayer space; the micro-circulation pump and the micro-electromagnetic valve are respectively arranged at both ends of the circulating insulating oil channel; small holes are arranged on the wall of the circulating insulating oil channel located in the jacket circulation pipe sleeve, and the acetylene selective permeation membrane is arranged outside the wall of the circulating insulating oil channel and covers each small hole; the acetylene detector has a plurality of detection probes, which are respectively distributed on the periphery of the acetylene selective permeation membrane. The device can detect the acetylene gas generated by the cracking of the insulating oil when a serious fault occurs in the high-voltage cable oil-filled terminal, and perform corresponding protection actions.

Description

Technical Field

[0001] The present invention relates to the technical field of detection and protection devices for power high-voltage cables, and in particular to a built-in acetylene detection and protection device for an oil-filled terminal of a high-voltage cable and a working method. Background Art

[0002] High-voltage cable oil-filled terminals are usually fully sealed and run with high voltage and high current. If a serious fault occurs inside, the characteristic is that the insulating oil is subjected to high energy and cracks to produce acetylene gas. However, the existing technical solutions and detection instruments can neither detect the acetylene content inside the high-voltage cable oil-filled terminal under power-off state, nor can they take corresponding protective measures. This is completely different from other electric high-voltage oil-filled equipment such as oil-filled main transformers, oil-filled mutual inductors, reactors, combined capacitors, etc., which can take out oil for detection through sampling valves. When a serious overheating or discharge fault occurs in the high-voltage cable oil-filled terminal, the temperature will rise abnormally quickly at the fault point, or the discharge energy will be released rapidly, causing a vicious cycle. As the degree of fault development increases, the above situation will increase exponentially, resulting in high-energy cracking of the insulating oil around the fault point to produce a large amount of triple-bond acetylene gas. If not handled in time, it may cause the high-voltage cable oil-filled terminal to burn or even explode, seriously endangering the personal safety of the staff around the high-voltage cable oil-filled terminal and the safe operation of the power grid. Summary of the invention

[0003] In view of the defects and shortcomings of the prior art, the present invention proposes a built-in acetylene detection and protection device and a working method for a high-voltage cable oil-filled terminal. The device provided is an acetylene detector that is built-in and packaged inside the high-voltage cable oil-filled terminal and other matching internal and external devices. The device can detect acetylene gas generated by the decomposition of insulating oil when a serious fault occurs in the high-voltage cable oil-filled terminal, and perform corresponding protection actions according to the content of acetylene gas generated by the fault.

[0004] Considering that the temperature of the high-voltage cable oil-filled terminal is not high during normal operation, the insulating oil inside it is only low-energy aging decomposition during long-term use and normal aging process, and the decomposition products are mainly hydrogen, carbon monoxide, carbon dioxide and low-energy decomposition of single- and double-bond low-molecular hydrocarbon gases. However, when the high-voltage cable oil-filled terminal is seriously overheated or discharges, it will be abnormally fast at the fault point. The temperature rises rapidly, or the discharge energy is released sharply, and a vicious cycle occurs. As the degree of fault development increases, the above situation increases exponentially, resulting in high-energy decomposition of the insulating oil around the fault point to produce triple-bond acetylene gas. The characteristic of a serious fault inside the electric high-voltage oil-filled equipment is that the insulating oil is subjected to high-energy decomposition to produce acetylene gas. However, since the high-voltage cable oil-filled terminal is usually fully enclosed and sealed to operate with high voltage and high current, the existing detection instrument cannot detect the acetylene content inside the high-voltage cable oil-filled terminal with power on-line, and there is no way to take corresponding protective measures. This is fundamentally different from other electric high-voltage oil-filled equipment such as: oil-filled main transformer, oil-filled mutual inductor, reactor, and combined capacitor, which can take out oil for detection through a sampling valve. Therefore, the present invention is of great significance.

[0005] The present invention specifically adopts the following technical solutions:

[0006] A built-in acetylene detection and protection device for a high-voltage cable oil-filled terminal, characterized in that: it is encapsulated inside the high-voltage cable oil-filled terminal, and comprises: a micro-circulation pump, a circulating insulating oil channel, a jacket circulation pipe, an acetylene selective permeation membrane, an acetylene detector and a micro-electromagnetic valve;

[0007] The jacket circulation pipe sleeve is arranged outside the circulating insulating oil channel and forms a jacket interlayer space;

[0008] The micro circulation pump and the micro solenoid valve are respectively arranged at two ends of the circulating insulating oil channel;

[0009] Small holes are arranged at intervals on the wall of the circulating insulating oil channel in the jacket circulating pipe sleeve, and the acetylene selective permeation membrane is arranged outside the wall of the circulating insulating oil channel and covers the small holes;

[0010] The acetylene detector is provided with a plurality of detection probes, which are respectively distributed on the periphery of the acetylene selective permeation membrane;

[0011] The micro-circulation pump, micro-electromagnetic valve and acetylene detector are wirelessly connected to a controller located outside the high-voltage cable oil-filling terminal.

[0012] Furthermore, the acetylene selective permeable membrane is an acetylene selective polypropylene permeable membrane; the acetylene detector is a semiconductor acetylene detector; the micro circulation pump, micro solenoid valve and acetylene detector are respectively equipped with a bidirectional radio frequency device and a wireless charging battery, and are connected to a controller via an external bidirectional radio frequency device via wires.

[0013] Furthermore, a wireless charger is installed outside the high-voltage cable oil-filling terminal for charging the wireless charging battery.

[0014] Furthermore, the device is installed at the bottom of the cable oil-filled terminal.

[0015] Furthermore, the controller is a single chip microcomputer or a PLC.

[0016] Furthermore, the controller is connected to an alarm and is connected to a circuit breaker on the incoming power side of the high-voltage cable via a trip protection secondary circuit.

[0017] And, according to the above preferred working method of the built-in acetylene detection and protection device of the high-voltage cable oil-filled terminal, it is characterized by comprising the following steps:

[0018] Step S1: Preset the working parameters of each module through the controller;

[0019] Step S2: Turn on the acetylene detector, the micro solenoid valve and the micro circulation pump in sequence;

[0020] Step S3: Under the multiple effects of the power pressure of the micro-circulation pump, the pressure generated by the intermittent closing of the micro-solenoid valve, and the concentration difference on both sides of the acetylene selective permeation membrane, the acetylene gas contained in the insulating oil tends to permeate in the direction of low concentration and is sensed by the detection probe;

[0021] Step S4: When the acetylene detector detects that acetylene gas appears inside the oil-filled terminal of the high-voltage cable and reaches the alarm setting value, the alarm sounds;

[0022] Step S5: When the acetylene detector detects a large amount of acetylene gas inside the high-voltage cable oil-filled terminal and reaches a preset threshold, the controller controls the trip protection secondary circuit to operate and disconnect the circuit breaker on the incoming power side of the high-voltage cable.

[0023] Furthermore, in step S1, the preset working parameters include: acetylene alarm value, severe fault circuit breaker trip protection value, and micro solenoid valve intermittent opening and closing cycle setting value.

[0024] Furthermore, the micro-circulation pump, micro-solenoid valve and acetylene detector are respectively equipped with built-in wireless charging batteries. When the battery power of the micro-circulation pump, micro-solenoid valve and acetylene detector drops to a set value, they are wirelessly charged by an external wireless power supply.

[0025] Furthermore, the wireless charging working parameters of the micro circulation pump, the micro solenoid valve and the acetylene detector are set in step S1.

[0026] The present invention and its preferred embodiment are aimed at the structure, operation mode and fault type of the oil-filled terminal of the power high-voltage cable, and the characteristic that the insulating oil is cracked by high energy to produce acetylene gas if a malignant and serious fault occurs inside. The acetylene detector and other matching internal and external equipment packaged inside the high-voltage cable oil-filled terminal can detect the acetylene gas produced by the cracking of the insulating oil in the high-voltage cable oil-filled terminal when a malignant and serious fault occurs online, and perform corresponding protection actions according to the content of the acetylene gas produced by the fault.

[0027] At the same time, the intermittent solenoid valve periodic closing function designed to increase the circulating oil pressure can facilitate the penetration of acetylene gas in the insulating oil into the selective permeation membrane;

[0028] It changes the shortcomings of the existing technology that it is impossible to detect the acetylene gas produced by the cracking of insulating oil in the oil-filled terminal of the high-voltage cable when a serious fault occurs, and it is even more impossible to take corresponding protective measures. It can effectively ensure the safe operation of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0030] Figure 1 This is a schematic diagram of an acetylene detection module device according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the operation of the acetylene detection module installed in a sealed high-voltage cable oil-filled terminal according to an embodiment of the present invention;

[0032] Figure 3 This is a partial enlarged schematic diagram of the operation of the acetylene detection module installed in a sealed high-voltage cable oil-filled terminal according to an embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the principle of acetylene permeation through a permeable membrane in an insulating oil according to an embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of a tripping circuit of a high-voltage circuit breaker according to an embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the connection of high-voltage circuit breakers, high-voltage conductors, high-voltage cables, and high-voltage cable oil-filled terminal lines on both sides according to an embodiment of the present invention;

[0036] Figure 7 This is a schematic diagram of a closing state in which the moving contact 27 and the static contact 26 of the high-voltage circuit breaker are in close contact when the high-voltage cable oil-filled terminal according to an embodiment of the present invention is operating normally;

[0037] Figure 8This is a schematic diagram of a state in which a serious malignant fault occurs in the oil-filled terminal of a high-voltage cable according to an embodiment of the present invention, a large amount of acetylene appears, the high-voltage circuit breaker trips for protection, and the moving contact 27 and the static contact 26 are in an open state;

[0038] Fig. 9 It is a block diagram of the working principle of the control module of the built-in acetylene detection and protection device of the high-voltage cable oil-filled terminal according to an embodiment of the present invention.

[0039] In the figure, 1-micro circulation pump; 2-jacket circulation pipe; 3-jacket interlayer space; 4-acetylene selective polymaple permeable membrane; 5-semiconductor acetylene detector; 6-semiconductor acetylene detector probe; 7-jacket circulation inner tube; 8-small hole; 9-micro solenoid valve; 10-power side high-voltage cable oil filling terminal; 11-high-voltage cable oil filling terminal supporting insulator; 12-lower sealing gland group; 13-insulating tape; 14-stress control cone; 15-high-strength porcelain sleeve; 16-insulating oil; 17-conductive rod; 18-outlet connector; 19-acetylene detection module; 20-external bidirectional radio frequency device; 21-wireless power supply module; 22-acetylene gas; 23-high-voltage cable incoming side circuit breaker; 24-load side high-voltage cable oil filling terminal; 25-high-voltage cable; 26-circuit breaker static contact; 27-circuit breaker moving contact. DETAILED DESCRIPTION

[0040] In order to make the features and advantages of this patent more obvious and easy to understand, the following embodiments are specifically described in detail with the accompanying drawings as follows:

[0041] like Figure 1-Figure 9 As shown, the overall solution provided in this embodiment includes: a high-voltage cable oil filling terminal, an acetylene detection module 19, a wireless transmission module, a wireless power supply module 21, related protection systems, and a control module, etc.

[0042] Among them, the high-voltage cable oil-filled terminal is a structure commonly used in existing power grids, including: high-voltage cable 25, insulating tape 13, stress control cone 14, insulating oil 16, lead-out rod (conductive rod 17), lead-out connector 18, insulating jacket (high-strength porcelain sleeve 15), high-voltage cable oil-filled terminal supporting insulator 11, lower sealing gland group 12, etc. As an important component of high-voltage cable, the high-voltage cable oil-filled terminal mainly plays the role of protecting and supporting the connection, transition and conversion of high-voltage cables.

[0043] As the main part of the design of this embodiment, the acetylene detection module includes: a micro-circulation pump 1, a jacket circulation pipe 2, a jacket interlayer space 3, an acetylene selective polymaple permeable membrane 4 (or other permeable membranes suitable for acetylene selectivity), a semiconductor acetylene detector 5 (or other acetylene detectors suitable for closed operation with built-in cable oil filling terminals), a semiconductor acetylene detector probe 6, a micro-solenoid valve 9 at the outlet of the jacket circulation pipe, etc.

[0044] The acetylene detection module 19 is installed at the bottom of the cable oil filling terminal. The inner part of the jacket circulation pipe in the acetylene detection module is a circulating insulating oil channel as the jacket circulation inner pipe 7. Small holes 8 are evenly spaced between the circulation pipe wall and the jacket. The acetylene selective polymaple permeable membrane is installed between the circulation pipe wall and the jacket layer and covers the small holes to facilitate the acetylene in the oil flowing through the circulation pipe to penetrate into the jacket layer space. The acetylene selective polymaple permeable membrane can only selectively penetrate acetylene gas 22, while other substances, including insulating oil, are kept isolated. The semiconductor acetylene detector is installed in the upper part of the jacket layer, and its several micro probes extend to the jacket space near the acetylene selective polymaple permeable membrane, so as to effectively detect the acetylene that penetrates into the interlayer space. Acetylene is driven by the acetylene selective polymaple permeable membrane, mainly providing the circulating insulating oil pressure for the circulation pump, and the permeation of the acetylene concentration difference on both sides of the acetylene selective polymaple permeable membrane. The semiconductor acetylene detector, micro-circulation pump, and micro-solenoid valve are each equipped with a built-in bidirectional radio frequency device and a wireless charging battery. The semiconductor acetylene detector, micro-circulation pump, and micro-solenoid valve can receive control instructions issued by an external control module through an external bidirectional radio frequency device through their own built-in bidirectional radio frequency devices, and can also send detection data and operating status parameters to the external bidirectional radio frequency device 20 through their own built-in bidirectional radio frequency devices.

[0045] The outlet of the micro-circulation pump is installed at the inlet of the jacket circulation pipe. A micro-solenoid valve is installed at the outlet of the jacket circulation pipe. The micro-solenoid valve is wirelessly controlled by the control module during operation to close and open at intervals, which plays the role of briefly increasing the pressure of the insulating oil in the circulation pipe at periodic intervals, so as to facilitate the penetration of acetylene in the insulating oil into the permeable membrane. The micro-circulation pump is specially designed to adapt to the higher viscosity insulating oil (such as silicone oil, etc.) in the oil-filled terminal of the high-voltage cable.

[0046] In this embodiment, all metal parts built into the oil-filled terminal of the high-voltage cable are shielded to prevent the generation of floating potential.

[0047] Taking into account the characteristic that the acetylene detection module needs to be installed in a closed manner, in order to realize data communication, the present embodiment is specially designed with a wireless transmission module, which includes a two-way micro radio frequency device installed in a built-in semiconductor acetylene detector, a built-in two-way micro radio frequency device installed in a micro circulation pump, and a built-in two-way micro radio frequency device installed on a micro solenoid valve, as well as an external two-way radio frequency device installed outside the high-voltage cable oil filling terminal. The built-in corresponding micro two-way radio frequency devices can not only wirelessly transmit the detection data of the semiconductor acetylene detector, the micro circulation pump, and the real-time operating status of the micro solenoid valve to the external radio frequency device, but also receive the control command signal sent from the control module through the external two-way radio frequency device to work. Similarly, the external two-way radio frequency device can not only wirelessly transmit the control command signal sent by the control module to each built-in two-way radio frequency device, but also wirelessly receive data and signals sent by each built-in two-way radio frequency device, and transmit them to the control module through optical fiber. The working frequency of transmitting data and signals between each radio frequency device should strictly comply with the frequency band requirements of the wireless communication protocol.

[0048] Similarly, this embodiment uses a wireless power supply module to power the main module. The wireless power supply module can wirelessly charge the micro high-energy lithium batteries (or other micro high-efficiency batteries) built into the semiconductor acetylene detector, micro circulation pump, and micro solenoid valve. The charging work is controlled by the control module according to the pre-set and programmed power range.

[0049] In order to better achieve the purpose of the present invention, it is also equipped with a related protection system, which includes: an alarm, a tripping protection secondary circuit, a circuit breaker on the incoming side of the high-voltage cable, etc. When the semiconductor acetylene detector detects that acetylene appears inside the oil-filled terminal of the high-voltage cable and reaches the alarm setting value, the alarm sounds to remind the staff to take measures as soon as possible. When the semiconductor acetylene detector detects that a large amount of acetylene appears inside the oil-filled terminal of the high-voltage cable and reaches the setting value of the programming software program pre-set by the control module, the tripping protection secondary circuit is automatically controlled to operate, disconnect the circuit breaker on the incoming side of the high-voltage cable (separate the static contact 26 and the moving contact 27 of the circuit breaker), and isolate the high-voltage cable with a serious (malignant) fault from the power grid to prevent the accident from further expanding, effectively ensuring the safe operation of the power grid.

[0050] in Figure 5 It is a schematic diagram of the tripping circuit of the high-voltage circuit breaker, +KM and -KM are the DC positive and negative power supplies; TJ is the tripping output contact of the protection device; HJ is the closing output contact of the reclosing device; LP1 is the tripping output pressure plate of the protection device; LP2 is the reclosing output pressure plate; DL is the auxiliary contact of the circuit breaker, the one connected to the tripping circuit is the normally open contact, and the one connected to the closing circuit is the normally closed contact; TQ is the tripping coil; HQ is the closing coil.

[0051] The control module of this embodiment can adopt a single-chip microcomputer or an industrial PLC. The control module can pre-set the following programs: the built-in acetylene alarm value of the high-voltage cable oil filling terminal, the tripping protection value of the circuit breaker for severe malicious faults, the intermittent opening and closing cycle of the micro solenoid valve, the control operation program of the semiconductor acetylene detector, the micro circulation pump, and the micro solenoid valve, and the automatic wireless charging power control, etc.

[0052] The semiconductor acetylene detector is electrically connected to its own built-in micro bidirectional radio frequency device, the micro circulation pump is electrically connected to its own built-in micro bidirectional radio frequency device, and the micro solenoid valve is electrically connected to its own built-in micro bidirectional radio frequency device. The above built-in bidirectional radio frequency devices are wirelessly connected to an external bidirectional radio frequency device, and the external bidirectional radio frequency device is bidirectionally electrically connected to the control module via optical fiber. The output end of the control module is also electrically connected to the alarm, circuit breaker tripping protection secondary circuit, etc.

[0053] Based on the above designed built-in acetylene detection and protection device solution for the high-voltage cable oil-filled terminal, this embodiment also provides specific detection and protection methods as follows:

[0054] 1) The control module is pre-programmed with: built-in acetylene alarm value of high-voltage cable oil filling terminals 10 and 24, trip protection value of circuit breaker for serious malignant fault, setting value of intermittent opening and closing cycle of micro solenoid valve 9, control operation program of semiconductor acetylene detector 5, micro circulation pump 1, micro solenoid valve 9, and charging power control strategy of automatic wireless charger 21, etc.;

[0055] 2) Open the high-voltage cable oil filling terminal including (the power supply side high-voltage cable oil filling terminal 10 and the load side high-voltage cable oil filling terminal 24) and the built-in acetylene detection and protection device;

[0056] 3) Turn on the semiconductor acetylene detector 6, the micro solenoid valve 9, and the micro circulation pump 1 in sequence;

[0057] 4) The insulating oil 16 flowing through the jacket circulation pipe 2 in the cable oil filling terminal 10, 24, under the multiple effects of the power pressure of the micro circulation pump 1 and the pressure generated by the intermittent closing of the micro electromagnetic valve 9, as well as the concentration difference on both sides of the acetylene selective polymathion permeable membrane 4, the acetylene gas 22 contained therein will tend to permeate in the direction of lower concentration, and be sensed by the semiconductor detector probe 6;

[0058] 5) When the semiconductor acetylene detector 5 detects that acetylene gas 22 appears inside the high-voltage cable oil-filled terminal 10, 24 and reaches the alarm setting value, the alarm will sound to remind the staff to take measures as soon as possible;

[0059] 6) When the semiconductor acetylene detector 5 detects a large amount of acetylene gas 22 inside the high-voltage cable oil filling terminal 10, 24 and reaches the setting value of the programming software program pre-set by the control module, the secondary circuit of the automatic control trip protection is actuated to disconnect the circuit breaker 23 on the incoming side of the high-voltage cable, and isolate the high-voltage cable with a serious (malignant) fault from the power grid to prevent the accident from further expanding;

[0060] 7) When the battery power of the semiconductor acetylene detector 5, the micro solenoid valve 9, and the micro circulation pump 1 drops to the set value, the external wireless power supply 21 automatically performs wireless charging.

[0061] This patent is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of built-in acetylene detection and protection devices and working methods for high-voltage cable oil-filled terminals under the inspiration of this patent. All equal changes and modifications made according to the scope of the patent application of the present invention should be covered by this patent.

Claims

1. A built-in acetylene detection and protection device for a high-voltage cable oil-filled terminal, characterized in that: Encapsulated inside the high voltage cable oil-filled terminal, it includes: a micro circulation pump, a circulating insulating oil channel, a jacket circulation pipe, an acetylene selective permeation membrane, an acetylene detector and a micro solenoid valve; The jacket circulation pipe sleeve is arranged outside the circulating insulating oil channel and forms a jacket interlayer space; The micro circulation pump and the micro solenoid valve are respectively arranged at two ends of the circulating insulating oil channel; Small holes are arranged at intervals on the wall of the circulating insulating oil channel in the jacket circulating pipe sleeve, and the acetylene selective permeation membrane is arranged outside the wall of the circulating insulating oil channel and covers the small holes; The acetylene detector is provided with a plurality of detection probes, which are respectively distributed on the periphery of the acetylene selective permeation membrane; The micro-circulation pump, micro-electromagnetic valve and acetylene detector are wirelessly connected to a controller located outside the high-voltage cable oil filling terminal; The acetylene selective permeable membrane is an acetylene selective polypropylene permeable membrane; the acetylene detector is a semiconductor acetylene detector; the micro circulation pump, micro solenoid valve and acetylene detector are respectively equipped with a bidirectional radio frequency device and a wireless charging battery, and are connected to the controller via an external bidirectional radio frequency device via wires; The controller is connected to an alarm and is connected to a circuit breaker on the incoming power side of the high-voltage cable via a trip protection secondary circuit.

2. The built-in acetylene detection and protection device for the high-voltage cable oil-filled terminal according to claim 1 is characterized in that: A wireless charger is installed outside the high-voltage cable oil-filling terminal for charging the wireless charging battery.

3. The built-in acetylene detection and protection device for the high-voltage cable oil-filled terminal according to claim 1 is characterized in that: Installed at the bottom of the cable oil-filled terminal.

4. The built-in acetylene detection and protection device for the high-voltage cable oil-filled terminal according to claim 1 is characterized in that: The controller is a single chip microcomputer or a PLC.

5. The working method of the built-in acetylene detection and protection device of the high-voltage cable oil-filled terminal according to claim 1 is characterized in that: The following steps are involved: Step S1: Preset the working parameters of each module through the controller; Step S2: Turn on the acetylene detector, the micro solenoid valve and the micro circulation pump in sequence; Step S3: Under the multiple effects of the power pressure of the micro-circulation pump, the pressure generated by the intermittent closing of the micro-solenoid valve, and the concentration difference on both sides of the acetylene selective permeation membrane, the acetylene gas contained in the insulating oil tends to permeate in the direction of low concentration and is sensed by the detection probe; Step S4: When the acetylene detector detects that acetylene gas appears inside the oil-filled terminal of the high-voltage cable and reaches the alarm setting value, the alarm sounds; Step S5: When the acetylene detector detects a large amount of acetylene gas inside the high-voltage cable oil-filled terminal and reaches a preset threshold, the controller controls the trip protection secondary circuit to operate and disconnect the circuit breaker on the incoming power side of the high-voltage cable.

6. The working method of the built-in acetylene detection and protection device of the high-voltage cable oil-filled terminal according to claim 5 is characterized in that: In step S1, the preset working parameters include: acetylene alarm value, severe fault circuit breaker trip protection value, and micro solenoid valve intermittent opening and closing cycle setting value.

7. The working method of the built-in acetylene detection and protection device of the high-voltage cable oil-filled terminal according to claim 5 is characterized in that: The micro-circulation pump, micro-solenoid valve and acetylene detector are respectively equipped with built-in wireless charging batteries. When the battery power of the micro-circulation pump, micro-solenoid valve and acetylene detector drops to a set value, they are wirelessly charged by an external wireless power supply.

8. The working method of the built-in acetylene detection and protection device of the high-voltage cable oil-filled terminal according to claim 7 is characterized in that: The wireless charging working parameters of the micro circulation pump, micro solenoid valve and acetylene detector are set in step S1.

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