A three-electrode ceramic gas discharge tube module for DC 5kA continuous current interruption

Abstract

The present invention relates to a three-pole ceramic gas discharge tube module, comprising a three-pole ceramic gas discharge tube connected in series with a magnetic micro-breaking mechanism. An electromagnetic tripper is also connected in parallel between the three-pole ceramic gas discharge tube and the magnetic micro-breaking mechanism. The magnetic micro-breaking mechanism is connected to an arc extinguishing chamber. After the arc is extinguished by the arc extinguishing plate caused by H2 explosion, the subsequent DC current is interrupted, increasing by hundreds or thousands of times. The high-voltage and high-current path of the lightning pulse passes through the three-pole ceramic gas discharge tube, micro-breaking two contacts; the subsequent DC current passes through the diode of the three-pole discharge tube and the micro-terminal magnetic inductor coil; when the DC current is higher than 3A or 5A, the subsequent DC current is immediately interrupted. The subsequent DC voltage is interrupted up to 1500V and the current is up to 5kA, which greatly improves the defects of traditional three-pole ceramic gas discharge tubes, maximizes the lightning protection characteristics of the ceramic gas discharge tube, and makes the greatest contribution to lightning protection and disaster reduction and improving economic benefits.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit equipment, and in particular to a three-pole ceramic gas discharge tube module for DC 5kA freewheeling interruption. Background Art

[0002] Lightning, overvoltage and overcurrent in power systems, and electromagnetic pulse disturbances—all unique natural weather phenomena or complex electromagnetic pulses generated under unique conditions—are major causes of damage to power electronics. These hazards constantly threaten the safe and stable operation of power and electronic information systems in various fields, including construction, railways, aviation, communications, industrial control, and the military. Installing lightning protection components in these systems—discharge tube modules with high follow-on current interruption capabilities—to provide overvoltage and overcurrent protection has long been a focus of scientific research and exploration.

[0003] Existing technical solutions have insufficient follow-on current interruption capability. The pentode (five diode ceramic gas tubes connected in series) can only be used in situations below 48VDC, and the follow-on current interruption capability is only about 3kA. Lightning strikes cause the ceramic gas discharge tube to short-circuit, effectively diverting the lightning current into the ground. At the same time, the current of the line's DC power supply is also short-circuited. At this time, the subsequent current cannot be interrupted in time, which will cause the lightning protection component itself to explode, and the line distribution box and surrounding areas to burn, resulting in huge personal and property losses. Summary of the Invention

[0004] (1) Technical issues to be resolved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a three-pole ceramic gas discharge tube module, which solves the technical problem that existing protectors containing traditional ceramic gas discharge tubes can only be used in applications below 48VDC and have a continuous current interruption capacity of only about 3kA. Lightning strikes cause the ceramic gas discharge tube to short-circuit, effectively diverting the lightning current underground. At the same time, the current of the line DC power supply is also short-circuited. At this time, the subsequent current cannot be blocked in time, which can cause the lightning protection component itself to explode, the line distribution box and the surrounding area to burn, and cause huge personal and property losses.

[0006] (2) Technical solution

[0007] In order to achieve the above objectives, the main technical solutions adopted by the present invention include:

[0008] The present invention also provides a three-pole ceramic gas discharge tube module, comprising a base body with a mounting clip at the lower end and a cover body adapted to the base body, a handle installed in the base body, and a mechanical locking device connected to the handle at the upper end, wherein the lower end of the mechanical locking device is provided with a moving contact rod, and the moving contact rod is provided with a moving contact, and the lower end of the mechanical locking device is provided with an electromagnetic release, and a first terminal and a second terminal are provided on both sides of the electromagnetic release, and a three-pole ceramic gas discharge tube is provided between the electromagnetic release and the first terminal, and the three-pole ceramic gas discharge tube is provided with an electrode lead and is connected to the electromagnetic release in series through the electrode lead, one end face of the three-pole ceramic gas discharge tube is connected to the first contact piece on the first terminal, and the other end face of the three-pole ceramic gas discharge tube is connected to the yoke of the electromagnetic release, and the lower end of the electromagnetic release is provided with an arc extinguishing chamber, and the arc extinguishing chamber is connected to the static contact piece installed on the second terminal through an arc extinguishing electrode piece provided at its lower end, and the static contact piece is provided with a static contact.

[0009] Preferably, the triode ceramic gas discharge tube has an asymmetric structure.

[0010] Preferably, the three-electrode ceramic gas discharge tube includes a first porcelain tube, a second porcelain tube, a first electrode, a second electrode and a third electrode, the second electrode is arranged between the first porcelain tube and the second porcelain tube, the first electrode and the third electrode are respectively arranged on the outside of the first porcelain tube and the second porcelain tube, a first gap is formed between the first electrode and the second electrode, and a second gap is formed between the second electrode and the third electrode.

[0011] Preferably, the side surfaces of the first electrode and the second electrode sheet and the two side surfaces of the second electrode are all convexly formed to form discharge emission surfaces, and the discharge emission surfaces are electron emission material coatings.

[0012] Preferably, a protrusion is provided on the outer side of the second electrode, and the protrusion is connected to the electrode lead.

[0013] Preferably, the movable contact and the static contact are spaced apart from each other and opposite to each other, and contact shields are provided on both sides of the movable contact and the static contact.

[0014] Preferably, terminal installation chambers are provided on both sides of the seat body, a locking mechanism chamber, a trip chamber and an arc extinguishing space are provided between the two terminal installation chambers from top to bottom, and a contact space is further provided adjacent to the trip chamber.

[0015] Preferably, the arc extinguishing chamber includes two mounting plates and two or more H2 deflagration arc extinguishing sheets provided with V-shaped grooves, and the H2 deflagration arc extinguishing sheets are arranged at equal intervals between the mounting plates.

[0016] (3) Beneficial effects

[0017] The beneficial effects of the present invention are as follows: the present invention has a three-pole ceramic gas discharge tube module with a DC 5kA continuous current interruption capability. This technical solution uses a three-pole ceramic gas discharge tube in series with a magnetic micro-interrupting mechanism. After the arc is extinguished by the deflagration arc extinguishing plate, the subsequent DC current is interrupted, increasing by hundreds or thousands of times. The high-voltage and high-current path of the lightning pulse passes through the three-pole ceramic gas discharge tube, micro-breaking the two contacts; the subsequent DC current passes through the diode of the three-pole discharge tube and the micro-terminal magnetic inductor coil; when the DC current is higher than 3A or 5A, the inductor coil is customized according to customer requirements to immediately interrupt the subsequent DC current. The subsequent DC voltage is interrupted up to 1500V and the current is up to 5kA, which greatly improves the defects of traditional three-pole ceramic gas discharge tubes, maximizes the lightning protection characteristics of the ceramic gas discharge tube, and makes the greatest contribution to lightning protection and disaster reduction, and improves economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a circuit schematic diagram in an embodiment of the present invention;

[0019] Figure 2 A three-dimensional diagram of the overall structure of an embodiment of the present invention;

[0020] Figure 3 is an internal structure diagram in an embodiment of the present invention;

[0021] Figure 4 An exploded view of the overall structure of an embodiment of the present invention;

[0022] Figure 5 A half-section diagram of a triode ceramic gas discharge tube in an embodiment of the present invention;

[0023] Figure 6 2 is a structural diagram of the arc extinguishing chamber in an embodiment of the present invention.

[0024] [Description of Reference Numerals]

[0025] 1. Moving contact; 2. Arc extinguishing chamber; 21. Mounting plate; 23. V-shaped groove; 3. Magnetic rod; 4. Magnetic coil; 5. Three-pole ceramic gas discharge tube; 6. Base; 7. Cover; 8. Mechanical locking device; 81. Handle; 9. Moving contact rod; 91. Moving contact; 10. Electromagnetic release; 11. First terminal; 12. Second terminal; 13. H2 deflagration arc extinguishing plate; 130. First porcelain tube; 131. Second porcelain tube; 132. First electrode; 1 33. Second electrode; 134. Third electrode; 135. First gap; 136. Second gap; 137. Discharge emission surface; 138. Protrusion; 14. Electrode lead; 15. First contact piece; 16. Yoke; 18. Static contact piece; 19. Static contact; 20. Arc-extinguishing electrode piece; 21. Contact guard; 22. Terminal installation chamber; 23. Locking mechanism chamber; 24. Trip unit chamber; 25. Arc-extinguishing space; 26. Contact space; 27. Mounting clip. DETAILED DESCRIPTION

[0026] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Instead, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0027] See also Figures 1 to 6 The present invention provides a three-pole ceramic gas discharge tube module for DC 5kA freewheeling interruption, comprising a base body 6 with a mounting clip 27 at the lower end and a cover body 7 adapted to the base body 6, a handle 81 installed in the base body 6, and a mechanical locking device 8 connected to the handle 81 at the upper end. The mechanical locking device 8 is a prior art structure commonly used in circuit breakers. A moving contact rod 9 is provided at the lower end of the mechanical locking device 8, and the moving contact rod 9 is provided with a moving contact 91. An electromagnetic release 10 is provided at the lower end of the mechanical locking device 8. The magnetic moving rod 3 on the electromagnetic release 9 separates the moving contact 91 on the moving contact rod 9 from the static contact 19 under the action of the magnetic coil 4 to cut off the current. First contact 10 is provided on both sides of the electromagnetic release 10. A wiring terminal 11 and a second wiring terminal 12, a three-pole ceramic gas discharge tube 5 is arranged between the electromagnetic release 10 and the first wiring terminal 11, the three-pole ceramic gas discharge tube 5 is provided with an electrode lead 14 and is connected to the electromagnetic release 10 in series through the electrode lead 14, one end face of the three-pole ceramic gas discharge tube 5 is connected to the first contact piece 15 on the first wiring terminal 11, and the other end face of the three-pole ceramic gas discharge tube 5 is connected to the yoke 16 of the electromagnetic release 10, and an arc extinguishing chamber 2 is provided at the lower end of the electromagnetic release 10, and the arc extinguishing chamber 2 is connected to the static contact piece 18 installed on the second wiring terminal 12 through the arc extinguishing electrode piece 20 arranged at its lower end, and the static contact piece 18 is provided with a static contact 19.

[0028] In the embodiment of the present disclosure, the triode ceramic gas discharge tube 5 has an asymmetric structure.

[0029] In the embodiment of the present disclosure, the three-electrode ceramic gas discharge tube 5 includes a first porcelain tube 130, a second porcelain tube 131, a first electrode 132, a second electrode 133 and a third electrode 134. The second electrode 133 is arranged between the first porcelain tube 130 and the second porcelain tube 131. The first electrode 132 and the third electrode 134 are respectively arranged on the outside of the first porcelain tube 130 and the second porcelain tube 131. A first gap 135 is formed between the first electrode 132 and the second electrode 133, and a second gap 136 is formed between the second electrode 133 and the third electrode 134.

[0030] In the embodiment of the present disclosure, the side surfaces of the first electrode 132 and the second electrode 133 and the two side surfaces of the second electrode 133 are all convexly provided to form a discharge emission surface 137. The discharge emission surface 137 is a coating of electron emission material. The material of the discharge emission surface 137 used in this solution is a composite material of 80% powder metallurgy tungsten and 20% copper.

[0031] In the embodiment of the present disclosure, a protrusion 138 is provided on the outer side of the second electrode 133 , and the protrusion 138 is connected to the electrode lead 14 .

[0032] In the embodiment of the present disclosure, the moving contact 91 and the static contact 19 are spaced apart from each other and opposite to each other, and contact shields 21 are provided on both sides of the moving contact 91 and the static contact 19 .

[0033] In the embodiment of the present disclosure, terminal installation chambers 22 are provided on both sides of the base body 6, and a locking mechanism chamber 23, a trip chamber 24 and an arc extinguishing space 25 are provided between the two terminal installation chambers 22 from top to bottom, and a contact space 26 is also provided adjacent to the trip chamber 24.

[0034] In the embodiment of the present disclosure, the arc extinguishing chamber 2 includes two mounting plates 21 and two or more H2 deflagration arc extinguishing pieces 13 provided with V-shaped grooves 23 , and the H2 deflagration arc extinguishing pieces 13 are arranged equidistantly between the mounting plates 21 .

[0035] In the embodiment of the present disclosure, the electromagnetic trip unit 10 includes an NTC, a magnetic rod 3 and a magnetic coil 4 .

[0036] According to the working principle of "pass direct current and block alternating current": lightning is a high-frequency pulse current wave, and its path goes through the three-pole ceramic gas discharge tube to the normally closed moving and static contacts, and does not go through the magnetic coil; the direct current (AC 50Hz is similar to direct current) path goes through the three-pole ceramic gas discharge tube to the magnetic coil and then to the normally closed moving and static contacts. The arcs generated by the above paths are all eliminated in the arc extinguishing chamber.

[0037] In summary, this technical solution utilizes a triode ceramic gas discharge tube in series with a magnetic micro-interrupter mechanism. After the arc is extinguished by an H2 deflagration arc extinguishing plate, the subsequent DC current is interrupted, increasing it by hundreds or even thousands of times. The high-voltage, high-current path of the lightning pulse passes through the triode ceramic gas discharge tube, micro-breaking its two contacts. The subsequent DC current flows through the triode discharge tube's diode and micro-terminal magnetic inductor. When the DC current exceeds 3A or 5A, a customized inductor is used according to customer requirements to instantly interrupt the subsequent DC current. This interruption capability can reach voltages up to 1500V and currents up to 5kA, significantly improving the shortcomings of traditional triode ceramic gas discharge tubes and maximizing their lightning protection properties, making the greatest contribution to lightning protection, disaster reduction, and improved economic efficiency.

[0038] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0039] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person of ordinary skill in the art cannot change, modify, replace or modify the above embodiments within the scope of the present invention.

Claims

1. A three-pole ceramic gas discharge tube module for DC 5kA continuous current interruption, comprising a base (6) with a mounting clip (27) at the lower end, a cover (7) adapted to the base (6), a handle (81) installed in the base (6), and a mechanical locking device (8) connected to the handle (81) at the upper end, wherein the lower end of the mechanical locking device (8) is provided with a movable contact rod (9), and the movable contact rod (9) is provided with a movable contact point (91), characterized in that: An electromagnetic release (10) is provided at the lower end of the mechanical locking device (8), and the electromagnetic release (10) includes a magnetic rod (3) and a magnetic coil (4). A first terminal (11) and a second terminal (12) are provided on both sides of the electromagnetic release (10). A three-pole ceramic gas discharge tube (5) is provided between the electromagnetic release (10) and the first terminal (11). The three-pole ceramic gas discharge tube (5) includes a first electrode (132), a second electrode (133) and a third electrode (134). The second electrode (133) is provided between the first electrode (132) and the third electrode (134). A first gap (135) is formed between the first electrode (132) and the second electrode (133), and a second gap (136) is formed between the second electrode (133) and the third electrode (134). A protrusion (138) is provided on the outer side of the second electrode (133). The protrusion (138) is connected to an electrode lead (14), and the three-pole ceramic gas discharge tube (5) is connected to the magnetic coil (4) in the electromagnetic release (10) in a series manner through the electrode lead (14). One end face of the three-pole ceramic gas discharge tube (5) is connected to the first contact piece (15) on the first terminal (11), and the other end face of the three-pole ceramic gas discharge tube (5) is connected to the yoke (16) of the electromagnetic release (10). An arc extinguishing chamber (2) is provided at the lower end of the tripper (10), and the arc extinguishing chamber (2) is connected to a static contact piece (18) mounted on the second terminal (12) via an arc extinguishing electrode piece (20) provided at the lower end thereof. The static contact piece (18) is provided with a static contact (19). Under the action of the magnetic coil (4), the magnetic rod (3) on the electromagnetic tripper (10) separates the moving contact (91) on the moving contact rod (9) from the static contact (19) to cut off the current.

2. The three-electrode ceramic gas discharge tube module for interrupting a 5kA DC freewheeling current as claimed in claim 1, characterized in that: The triode ceramic gas discharge tube (5) has an asymmetric structure.

3. The three-electrode ceramic gas discharge tube module for interrupting a 5kA DC freewheeling current as claimed in claim 1, characterized in that: The triode ceramic gas discharge tube (5) further comprises a first porcelain tube (130) and a second porcelain tube (131); a second electrode (133) is provided between the first porcelain tube (130) and the second porcelain tube (131); and the first electrode (132) and the third electrode (134) are respectively provided on the outside of the first porcelain tube (130) and the second porcelain tube (131).

4. The three-electrode ceramic gas discharge tube module for interrupting a 5kA DC freewheeling current as claimed in claim 1, characterized in that: The side surfaces of the first electrode (132) and the second electrode (133) sheets, as well as the two side surfaces of the second electrode (133), are all convexly provided to form a discharge emission surface (137), and the discharge emission surface (137) is an electron emission material coating.

5. The three-electrode ceramic gas discharge tube module for interrupting a 5kA DC freewheeling current as claimed in claim 1, characterized in that: The movable contact (91) and the static contact (19) are spaced apart from each other and face each other, and contact shields (21) are provided on both sides of the movable contact (91) and the static contact (19).

6. The three-electrode ceramic gas discharge tube module for interrupting a 5kA DC freewheeling current as claimed in claim 1, characterized in that: Terminal installation chambers (22) are provided on both sides of the base body (6), a locking mechanism chamber (23), a trip chamber (24) and an arc extinguishing space (25) are provided between the two terminal installation chambers (22) from top to bottom, and a contact space (26) is also provided adjacent to the trip chamber (24).

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