CN109461554B - Overvoltage protection device for parallel resistor gap - Google Patents
Overvoltage protection device for parallel resistor gap Download PDFInfo
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- CN109461554B CN109461554B CN201811189581.2A CN201811189581A CN109461554B CN 109461554 B CN109461554 B CN 109461554B CN 201811189581 A CN201811189581 A CN 201811189581A CN 109461554 B CN109461554 B CN 109461554B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
- H01C7/12—Overvoltage protection resistors
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Abstract
The invention discloses a parallel resistor gap overvoltage protection device, which comprises a direct current arrester and a bracket, wherein the direct current arrester is fixedly arranged on the bracket; the parallel resistance gap element is connected with the direct current lightning arrester in parallel and is arranged around the direct current lightning arrester; the magnetic reed relay is connected with the direct current lightning arrester in series; and a grounding wire is led out from the lower end of the magnetic reed relay, an aviation socket is connected onto a normally open normally closed contact of the magnetic reed relay and provided with a signal outgoing line, a flange is arranged at the lower end of the direct current arrester, an insulating pad is arranged at the bottom of the flange, and the flange is connected with the grounding wire. The invention has the advantages that when the motor car enters the alternating current system in the direct current system and the change-over switch is not timely changed and erupted to the alternating current system, the gap discharge current of the overvoltage protection device drives the magnetic reed relay to rapidly cut off the main loop, thereby avoiding the occurrence or expansion of accidents.
Description
Technical Field
The invention relates to the field of overvoltage protection, in particular to a parallel resistor gap overvoltage protection device mainly applied to an alternating current-direct current double-system electric tractor.
Background
In recent years, the rail transit industry of China is rapidly developed, China high-speed rails are attracted by international attention and people in the world like, and China manufacture moves to the world to influence the world. The power supply system of the domestic electrified railway is generally an alternating current type, and the dual-system alternating current and direct current traction mode is popularized and applied at home and abroad due to the fact that direct current traction lines are small in loss, long in power supply transmission distance and low in energy consumption, and is a trend of a power supply traction mode in remote areas. In order to adapt to a domestic and foreign alternating-current and direct-current double-system electric traction network, electric equipment of an electric traction vehicle needs to be effectively protected, and the direct-current electric equipment is prevented from being disturbed when alternating-current induced potential occurs in a direct-current and alternating-current transition region (a non-electricity region), and the direct-current equipment is caused to enter an alternating-current system due to the fact that alternating-current and direct-current voltages are not converted in time, so that great loss is caused.
In a motor car running under the double-current system voltage, the domestic direct-current voltage is 1.5kV, the alternating-current voltage is 25kV, and the voltage difference of the alternating-current voltage and the direct-current voltage can reach dozens of times. At present, a gapless oxide arrester is adopted for limiting operation overvoltage and external atmospheric overvoltage, when the system has overhigh temporary overvoltage and resonant overvoltage, the arrester cannot protect the system, if a motor car enters an alternating current system immediately in the process of high-speed running, signals are interfered or an alternating current-direct current conversion disconnecting link cannot be switched to the alternating current system in time, and direct current equipment on a locomotive is impacted and suffers loss.
Disclosure of Invention
The invention aims to provide a parallel resistor gap overvoltage protection device which can protect equipment from being invaded by overvoltage when operation overvoltage or atmospheric overvoltage occurs in the process of driving a motor car.
In order to solve the technical problems, the invention is realized by the following technical scheme: a parallel resistance gap overvoltage protection device comprises a direct current arrester and a bracket, wherein the direct current arrester is fixedly arranged on the bracket, and the bracket is also provided with a parallel resistance gap element and a magnetic reed relay which are integrated by a linear resistor; the parallel resistance gap element is connected with the direct current lightning arrester in parallel and is arranged around the direct current lightning arrester; the parallel resistance gap element is integrated in the composite insulating sleeve; the magnetic reed relay is connected with the direct current lightning arrester in series; and a grounding wire is led out from the lower end of the magnetic reed relay, a normally open and normally closed contact of the magnetic reed relay is connected with an aviation socket, the aviation socket is provided with a signal leading-out wire, a flange is arranged at the lower end of the direct current arrester, an insulating pad is arranged at the bottom of the flange, and the flange is connected with the grounding wire.
By adopting the technical scheme, the parallel resistance gap overvoltage protection device formed by combining the direct-current lightning protection element, the parallel resistance gap element and the magnetic reed relay is simple and compact in structure, small in size and reliable in action, integrates the parallel resistance gap element, can reduce errors caused in the installation process, and meanwhile, enables the installation to be more convenient. When the motor car is not timely converted at the change-over switch and the motor car is blown into an alternating current system from a direct current system, the gap discharge current of the parallel resistance gap element drives the magnetic reed relay to rapidly cut off the main loop, so that accidents are avoided or enlarged.
Further setting the following steps: the bracket comprises an upper mounting plate and a lower mounting plate, and the direct current arrester is mounted between the upper mounting plate and the lower mounting plate; the parallel resistance gap elements are arranged in three, and the parallel resistance gap elements are arranged between the upper mounting plate and the lower mounting plate and distributed around the direct current lightning arrester at equal intervals.
By adopting the technical scheme, the power frequency discharge has dispersity, and the power frequency discharge voltage can be controlled within a set range by arranging 3 parallel resistance gap elements.
Further setting the following steps: the upper mounting plate and the lower mounting plate are Y-shaped mounting plates with three equal included angles, and each edge is provided with a parallel resistor gap element.
Through adopting above-mentioned technical scheme, adopt Y shape structure to alleviate the weight of last mounting panel and lower mounting panel, simultaneously because trilateral contained angle equals, also be convenient for equidistant distribution setting between the three resistance clearance component that connects in parallel.
Further setting the following steps: the parallel resistance gap element comprises a mounting frame and two discharge electrodes arranged on the mounting frame at intervals, and a gap is formed between the two discharge electrodes; the discharge electrode is movably arranged along the mounting frame, and an adjusting gasket for controlling the position of the discharge electrode is arranged on the mounting frame.
By adopting the technical scheme, the size of the discharge gap can be adjusted according to the requirement of the discharge voltage, and the stability of the gap discharge breakdown voltage is ensured.
Further setting the following steps: the reed relay comprises a reed housing, a power frequency opening magnetic ring without a winding coil and a reed switch, wherein the reed switch is arranged at the opening of the power frequency opening magnetic ring and is packaged in the magnetic ring housing together with the power frequency opening magnetic ring.
By adopting the technical scheme, the reed switch is arranged in the magnetic ring shell, so that the structure of the parallel resistor gap overvoltage protection device is more compact.
Further setting the following steps: the power frequency opening magnetic ring is made of silicon steel sheet materials.
By adopting the technical scheme, the silicon steel sheet has better magnetoelectric property, is easy to produce, low in price, small in mechanical stress influence, and rapidly increased in loss at high frequency, generally only responds to the frequency below 400 Hz, and does not respond to action at the high frequency of operation and atmospheric overvoltage, so that the normal operation of a locomotive cannot be caused.
Drawings
FIG. 1 is a front view of the structure of the present embodiment;
FIG. 2 is a side view of the structure of the present embodiment;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
FIG. 4 is a top view of the present embodiment;
FIG. 5 is a schematic diagram of a parallel resistive gap element;
in the figure: 1. a parallel resistive gap element; 2. a direct current arrester; 3. an insulating pad; 4. an aviation socket; 5. a support; 6. a ground lead; 7. a signal outlet; 8. a reed relay; 801. a normally open and normally closed contact; 802. a power frequency opening magnetic ring; 803. a magnetic ring housing; 9. an upper mounting plate; 10. a lower mounting plate; 11. a flange; 12. a discharge electrode; 13. a mounting frame; 14. and adjusting the gasket.
Detailed Description
In order to make the technical solution of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 5, the invention provides a parallel resistor gap overvoltage protection device, which includes a bracket 5, a lower mounting plate 10 is fixedly arranged on the bracket 5, an upper mounting plate 9 is arranged right above the lower mounting plate 10 and is arranged at an interval therebetween, the upper mounting plate 9 and the lower mounting plate 10 are both Y-shaped mounting plates with equal three-side included angle, an umbrella skirt-shaped direct current arrester 2 and a parallel resistor gap element 1 are fixedly connected between the upper mounting plate 9 and the lower mounting plate 10, the direct current arrester 2 is arranged at the center of the upper mounting plate 9 and the lower mounting plate 10, the parallel resistor gap element 1 is arranged at the outer side of the direct current arrester 2 and is positioned at each side of the upper mounting plate 9 and the lower mounting plate 10, and the distances between the 3 parallel resistor gap elements 1 and the direct current arrester 2 are equal. The flange 11 is further arranged above the lower mounting plate 10, the flange 11, the lower mounting plate 10 and the support 5 are fixedly connected through a stud, an insulating pad 3 is wrapped outside the stud to insulate the direct current arrester 2 and the parallel resistance gap element 1 from the ground, a magnetic reed relay 8 and an aviation socket 4 are fixedly mounted on the flange 11, and the flange 11 is provided with a grounding wire 6 and is grounded. The parallel resistance gap element 1 is connected with the direct current lightning arrester 2 in parallel; the magnetic reed relay 8 is connected with the direct current lightning arrester 2 in series. The reed relay 8 comprises a reed housing, a power frequency opening magnetic ring 802 without a wound coil and a reed pipe, the reed pipe 703 is fixed at the opening of the power frequency opening magnetic ring 802 by glue, the reed pipe 703 and the power frequency opening magnetic ring are packaged into the magnetic ring housing 803, the reed relay 8 is connected with the aviation socket 4, and the power frequency opening magnetic ring 802 is made of silicon steel sheet materials. The aviation socket 4 is provided with a signal outgoing line 7, and the lower end of the magnetic reed relay 8 is led out of a grounding wire 6.
Preferably, the resistive ring is mounted in an insulating sleeve and vulcanized to form the parallel resistive gap element 1.
In addition, the parallel resistance gap element 1 comprises a mounting frame 13 and two discharge electrodes 12 arranged on the mounting frame 13 at intervals, and a gap is formed between the two discharge electrodes 12; the discharge electrode 12 is movably arranged along the mounting frame 13, and an adjusting gasket 14 for controlling the position of the discharge electrode 12 is arranged on the mounting frame 13. The gap can be adjusted by adjusting the spacer 14 according to the discharge voltage or power requirement.
The working principle of the parallel resistor gap overvoltage protection device in a direct current system is as follows: (1) when the locomotive is in direct current voltage traction movement, the induced operation overvoltage and atmospheric overvoltage are absorbed by the voltage dependent resistor in the direct current arrester 2 for voltage limiting, and the magnetic reed relay 8 does not act at the moment; (2) when a locomotive enters an alternating current system, because a conversion disconnecting link is not converted in time and is intruded into the alternating current system, when the voltage at two ends of a gap in the parallel resistance gap element 1 is equal to the working voltage of an arrester, the parallel resistance gap element 1 discharges to form short-circuit current, the magnetic reed relay 8 generates magnetic field attraction under the influence of the current, sends a signal to cut off the circuit breaker within 0.07s, avoids severe explosion of the direct current arrester 2 under the breakdown and damage state to endanger peripheral high-voltage equipment, and prevents a traction network from tripping; (3) when alternating current induced potential is superposed on a direct current traction network voltage in a direct current system, the induced potential is eliminated by the follow current of the parallel resistor gap resistor, if the voltage of the current flowing through the two ends of the resistor is greater than the gap working voltage, the parallel resistor gap element 1 discharges, and the resistor extinguishes arc when the voltage is lower than the gap working voltage, so that the direct current lightning arrester 2 is protected from being damaged; (4) the magnetic ring of the reed relay 8 is made of silicon steel sheets, and does not respond to the wave head below 400 Hz and above the frequency of the DC signal response more than 40 Hz.
The invention has the advantages that: (1) simple and compact structure, small volume and reliable action. When the motor car is not timely converted at the change-over switch and the motor car enters the alternating current system from the direct current system, the gap discharge current of the parallel resistance gap element 1 drives the magnetic reed relay 8 to rapidly cut off the main loop, so that accidents caused by the influence on equipment are avoided; (2) 3 parallel resistance gap elements 1 are arranged to control the power frequency discharge voltage within a set range; (3) the Y-shaped structure is adopted to reduce the weight of the upper mounting plate 9 and the lower mounting plate 10, and meanwhile, due to the fact that included angles of three sides are equal, the three parallel resistance gap elements 1 are convenient to be distributed at equal intervals; (4) the parallel resistance gap element 1 is integrated, so that errors caused in the installation process can be reduced, and the installation is more convenient; (5) the size of the discharge gap of the parallel resistance gap element 1 can be adjusted, and the stability of the gap discharge breakdown voltage is ensured; (6) the reed switch is arranged in the magnetic ring shell 803, so that the structure of the overvoltage protection device with the parallel resistor gap is more compact; (7) the silicon steel sheet has better magnetoelectric property, is easy to produce, low in price, small in mechanical stress influence, and the loss is sharply increased at high frequency, generally only responds to the frequency below 400 Hz, does not respond to action at the high frequency of operation and atmospheric overvoltage, and cannot cause the normal operation of a locomotive.
The above embodiments are merely illustrative, and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention, and the scope of the invention is defined by the appended claims.
Claims (3)
1. The utility model provides a parallelly connected resistance clearance overvoltage crowbar, includes direct current arrester and support, direct current arrester fixed mounting in the support, its characterized in that: the bracket is also provided with a linear resistor integrated parallel resistor gap element and a magnetic reed relay; the parallel resistance gap element is connected with the direct current lightning arrester in parallel and is arranged around the direct current lightning arrester; the magnetic reed relay is connected with the direct current lightning arrester in series; a grounding lead is led out of the lower end of the magnetic reed relay, a normally open and normally closed contact of the magnetic reed relay is connected with an aviation socket, the aviation socket is provided with a signal lead-out wire, a flange is arranged at the lower end of the direct current arrester, an insulating pad is arranged at the bottom of the flange, and the flange is connected with the grounding lead; the parallel resistor gap element is integrated in the composite insulating sleeve, the bracket comprises an upper mounting plate and a lower mounting plate, and the direct current arrester is mounted between the upper mounting plate and the lower mounting plate; the three parallel resistance gap elements are arranged between an upper mounting plate and a lower mounting plate and are uniformly distributed around the direct current arrester at equal intervals, the upper mounting plate and the lower mounting plate are Y-shaped mounting plates with three equal included angles, one parallel resistance gap element is arranged on each edge, each parallel resistance gap element comprises a mounting frame and two discharge electrodes arranged on the mounting frame at intervals, and a gap is formed between the two discharge electrodes; the discharge electrode is movably arranged along the mounting frame, and an adjusting gasket for controlling the position of the discharge electrode is arranged on the mounting frame.
2. The parallel resistor gap overvoltage protection device of claim 1, wherein: the reed relay comprises a reed housing, a power frequency opening magnetic ring without a winding coil and a reed switch, wherein the reed switch is arranged at the opening of the power frequency opening magnetic ring and is packaged in the magnetic ring housing together with the power frequency opening magnetic ring.
3. The parallel resistor gap overvoltage protection device of claim 2, wherein: the power frequency opening magnetic ring is made of silicon steel sheet materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811189581.2A CN109461554B (en) | 2018-10-12 | 2018-10-12 | Overvoltage protection device for parallel resistor gap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811189581.2A CN109461554B (en) | 2018-10-12 | 2018-10-12 | Overvoltage protection device for parallel resistor gap |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109461554A CN109461554A (en) | 2019-03-12 |
| CN109461554B true CN109461554B (en) | 2020-10-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811189581.2A Active CN109461554B (en) | 2018-10-12 | 2018-10-12 | Overvoltage protection device for parallel resistor gap |
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Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1110824C (en) * | 1999-09-08 | 2003-06-04 | 南京跃华电子电气公司 | Metal oxide arrester with non-linear internal gap |
| CN201774230U (en) * | 2010-08-13 | 2011-03-23 | 上海上友电气科技有限公司 | Transformer neutral point over-voltage protection device |
| CN107316724B (en) * | 2017-06-14 | 2018-10-12 | 温州益坤电气有限公司 | Alternating current-direct current voltage limiter |
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