CN201378733Y - Overvoltage limiting device of electric line - Google Patents
Overvoltage limiting device of electric line Download PDFInfo
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- CN201378733Y CN201378733Y CN200820228924U CN200820228924U CN201378733Y CN 201378733 Y CN201378733 Y CN 201378733Y CN 200820228924 U CN200820228924 U CN 200820228924U CN 200820228924 U CN200820228924 U CN 200820228924U CN 201378733 Y CN201378733 Y CN 201378733Y
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- resistance
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- electric
- capacitance
- limiting device
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Abstract
The utility model relates to a device limiting switching overvoltage on an electric line of an electric and electrified railway contact net. The device consists of a resistance, a resistance, a capacitance, a capacitance, a connecting terminal and a connecting terminal. The two ends of the capacitance are connected with the resistance in parallel, the two ends of the resistance are connected with the capacitance in parallel, the connecting terminal is connected with the resistance and the capacitance, and the connecting terminal is connected with the capacitance and the resistance. The nonlinear resistance is connected with the capacitance in series; under the normal working voltage, the current passing the nonlinear resistance is very small and the voltage on the capacitance is close to zero. When the overvoltage impulse of certain multiplying power surpassing the line voltage appears, the nonlinear resistance is reduced and the capacitance is charged. Under the joint action of the nonlinear resistance and the capacitance, the overvoltage amplitude is limited under a designed value and the security of electric equipment is ensured.
Description
Technical field:
The utility model relates generally to a kind of device that limits switching overvoltage on electric power, contact nets in electrified railways power transmission sequence, belongs to circuit voltage amplitude limitation electrical equipment.
Background technology:
Electric power transmission line, contact nets in electrified railways are visual plants to the user of power delivery.Because the access of load and withdrawing from, the state of circuit is changed and produce switching overvoltage on the circuit, the amplitude of switching overvoltage is very high, may cause that insulator surface punctures or different potentials between the air gap puncture, have influence on sending of circuit; When the insulation of electricity consumption line facility is weak, may cause device damage.Patent dry type overvoltage haustorium ZL92216405.3, resistance-capacitance type overvoltage absorber ZL93227235.5, capacitance-resistance overvoltage three-phase absorber ZL200520117130X all adopt connecting of linear resistance and electric capacity, when switch drops into, because the resistance of series resistance is less, cause immediate current very big, the state that has influence on circuit is with stable.Because series resistance is very little, when the line over-voltage energy was very big, the voltage difference at capacitor two ends was very big, caused the puncture of electric capacity easily and caused fault.
Summary of the invention:
The utility model purpose is to overcome the prior art deficiency, provides a kind of when normal the input, and is very little by the electric current of this device, do not change the parameter of circuit substantially; When the voltage at capacitor two ends is higher, bigger by the electric current of nonlinear resistance, thus limited the amplitude of voltage on the electric capacity.
The purpose of this utility model is finished like this: the overvoltage Limiting device of electric line is made up of first resistance (3), second resistance (5), first electric capacity (4), second electric capacity (6), binding post (1), binding post (2), second electric capacity (6) two ends are parallel with second resistance (5), first resistance (3) two ends are parallel with first electric capacity (4), binding post (1) connects with first resistance (3) and first electric capacity (4), and binding post (2) connects with second electric capacity (6) and second resistance (5).
The resistance that is connected in first resistance (3) between the electric line is non-linear.First resistance (3) and first electric capacity (4) can be the structure capacitives of non-linear first resistance (3), also shunt capacitor.
After first resistance (3), second resistance (5), first electric capacity (4) and second electric capacity (6) individual packages, be connected in by the conducting wire again and use on the circuit; After first resistance (3), second resistance (5), first electric capacity (4) and second electric capacity (6) assembling, be encapsulated in the same insulating case, draw lead and link with using circuit.
The resistance that is connected in first resistance (3) between the electric line is non-linear.When applying voltage above certain value, resistance sharply reduces, and charges to first electric capacity (4) by bigger electric current.Second electric capacity (6) two ends are parallel with second resistance (5), and its resistance can be the structural resistance of capacitor, also can add linear resistance or nonlinear resistance, are used to discharge the electric charge of electric capacity (3) or the voltage at limiting capacitance (3) two ends.
First resistance (3) two ends are parallel with first electric capacity (4), and its electric capacity can be the structure capacitive of non-linear first resistance (3), also shunt capacitor.
Operation principle: binding post (1,2) is connected on the circuit that needs the deboost amplitude, and under the voltage of operate as normal, nonlinear first resistance (3) resistance is very big, and the electric current that flows through is very little, and the voltage on second electric capacity (6) is also less; When the voltage magnitude of circuit surpasses the normal value certain multiple, nonlinear first resistance (3) resistance reduces rapidly, to second electric capacity (6) charging, the capacity of second electric capacity (6) just can guarantee that through suitable choosing the voltage magnitude on the circuit is no more than design load by bigger electric current.If second electric capacity (6) is gone up and when non-linear second resistance (5) is arranged, the amplitude of second electric capacity (6) voltage has also obtained restriction, institute's link is owing to nonlinear first resistance (3), nonlinear second resistance (5) acting in conjunction, and the ceiling voltage amplitude has also obtained restriction.
Description of drawings:
Below in conjunction with the accompanying drawing illustrated embodiment, the utility model structure and connecting relation done describing in further detail, but protection range is not limited to the accompanying drawing illustrated embodiment:
Circuit principle structure embodiment illustrated in fig. 1 is to a kind of action principle of overvoltage Limiting device of electric line.
Each unit absolute construction embodiment illustrated in fig. 2 connects the overvoltage Limiting device of a kind of electric line that constitutes by lead.
Each unit absolute construction embodiment illustrated in fig. 3 connects the overvoltage Limiting device of a kind of electric line that constitutes by lead.
Nonlinear resistance embodiment illustrated in fig. 4 is structure as a whole, and connects the overvoltage Limiting device of a kind of electric line that constitutes by lead.
The overvoltage Limiting device that nonlinear resistance embodiment illustrated in fig. 5, electric capacity are structure as a whole.
Structure embodiment illustrated in fig. 6 is parallel with the overvoltage Limiting device that discharging gap connects a kind of electric line that constitutes at the capacitor two ends.
Structure embodiment illustrated in fig. 7 is parallel with the overvoltage Limiting device that discharging gap connects a kind of electric line that constitutes between inlet wire.
Embodiment:
Circuit principle structure action principle embodiment illustrated in fig. 1 is described.
Binding post 1,2 is connected on the circuit that needs the deboost amplitude, and under the voltage of operate as normal, the resistance of non-linear first resistance 3 is very big, and the electric current that flows through is less, and the voltage on second electric capacity 6 is also less; When the voltage magnitude of circuit surpasses the normal value certain multiple, the resistance of non-linear first resistance 3 reduces rapidly, to 6 chargings of second electric capacity, the capacity of second electric capacity 6 just can guarantee that through suitable choosing the voltage magnitude on the circuit is no more than design load by bigger electric current.If on second electric capacity 6 and when non-linear second resistance 5 is arranged, the amplitude of second electric capacity, 6 voltages has also obtained restriction, institute's link is because the acting in conjunction of non-linear first resistance 3, non-linear second resistance 5, and the ceiling voltage amplitude has also obtained restriction.
Wherein: 1 is binding post; 2 is binding post; 3 is first resistance; 4 is first electric capacity; 5 is second resistance; 6 is second electric capacity.
Each unit absolute construction embodiment illustrated in fig. 2 is described by the overvoltage Limiting device that lead connects a kind of electric line that constitutes.
Binding post 1,2 among Fig. 2 derives from protected circuit.First resistance 3, second resistance 5, first electric capacity 4 and second electric capacity 6 are the individual packages structure, and outside is insulating surface smooth or that have pleat to roll over.Link up by screw rod 10, and be fixed on the base.Electric the going up by metal electrical connecting wire 7 in first resistance 3 and first electric capacity, 4 tops constitutes electric connection; The upper end of the lower end of first resistance 3 and second resistance 5 joins together with bolt 10, the upper end of the lower end of first electric capacity 4 and second electric capacity 6 join together with bolt 10; The lower end of first resistance 3 constitutes electric the connection with the lower end of first electric capacity 4 by metal electrical connecting wire 8; The lower end of second resistance 5, second electric capacity 6 joins together by bolt and base 11, and base 11 is fixed on the position that needs, as in the electric box, the appropriate location of railway electric locomotive roof; The lower end of second resistance 5 constitutes electric the connection with the lower end of second electric capacity 6 by metal electrical connecting wire 9.
Each unit absolute construction embodiment illustrated in fig. 3 is described by the overvoltage Limiting device that lead connects a kind of electric line that constitutes.
Binding post 1,2 among Fig. 3 derives from protected circuit.First resistance 3, second resistance 5, second electric capacity 6 are the individual packages structure, and first electric capacity 4 is the structure capacitive of first resistance 3.The upper end of the lower end of first resistance 3 and second resistance 5 joins together with bolt 10; The lower end of first resistance 3 constitutes electric the connection with the upper end of second electric capacity 6 by metal electrical connecting wire 8; The lower end of second resistance 5, second electric capacity 6 joins together by bolt and base 11, and base 11 is fixed on the position that needs, as in the electric box, the appropriate location of railway electric locomotive roof; The lower end of second resistance 5 constitutes electric the connection with the lower end of second electric capacity 6 by metal electrical connecting wire 9.
Nonlinear resistance embodiment illustrated in fig. 4 is structure as a whole, and the overvoltage Limiting device that connects a kind of electric line that constitutes by lead describes.
Binding post 1,2 among Fig. 4 derives from protected circuit.First resistance 3 and second resistance 5 are the one encapsulating structure, and electric coupling head is drawn in the centre, and second electric capacity 6 is the individual packages structure, and first electric capacity 4 is the structure capacitive of first resistance 3.The upper end of the lower end of first resistance 3 and second resistance 5 is fixed into one, and draws electric coupling head; The lower end of first resistance 3 constitutes electric the connection with the upper end of second electric capacity 6 by metal electrical connecting wire 8; The lower end of second resistance 5, second electric capacity 6 joins together by bolt and base 11, and base 11 is fixed on the position that needs, as in the electric box, the appropriate location of railway electric locomotive roof; The lower end of second resistance 5 constitutes electric the connection with the lower end of second electric capacity 6 by metal electrical connecting wire 9.
The overvoltage Limiting device that nonlinear resistance embodiment illustrated in fig. 5, electric capacity are structure as a whole describes.
Binding post 1,2 among Fig. 5 derives from protected circuit; after first resistance 3, second resistance 5, second electric capacity 6 are made, press the connecting mode in the schematic diagram after, be encapsulated in the insulating case; each interelement is full of dielectric, and dielectric can be solid or gas.When adopting solid, also can adopt the insulating material of fire retardation.The lower end of first resistance 3 is linked together on the upper end of second resistance 5 and second electric capacity 6 is electric; The lower end of the lower end of second resistance 5 and second electric capacity 6 is linked together by the firm banking of metal, is fixed on during installation on the base 11.Base 11 is fixed on the position that needs, as in the electric box, the appropriate location of railway electric locomotive roof.
To structure embodiment illustrated in fig. 6, the overvoltage Limiting device that is parallel with a kind of electric line of discharging gap connection formation at the capacitor two ends describes.
Other structure is identical with Fig. 2～5, behind second resistance, 5 second electric capacity 6 in parallel, and a discharging gap is arranged, be a gas gap (or liquid gap) between the top electrode 12 of discharging gap and the bottom electrode 13.Gap width is chosen as required.Electrode can be dull and stereotyped to dull and stereotyped, at plate, at pin, diagonal angle, angle, at the angle, at plate structure.Two electrodes 12,13 can be encapsulated in the insulator, with isolated from atmosphere; Also can directly make gap gas with air.
To structure embodiment illustrated in fig. 7, the overvoltage Limiting device that is parallel with a kind of electric line of discharging gap connection formation between inlet wire describes.
Other structure is identical with Fig. 2～6, behind first resistance 3 series connection, second resistance 5, at first resistance, 3 series connection second resistance, 5 two ends and a discharging gap is arranged, is a gas gap (or liquid gap) between the top electrode 14 of discharging gap and the bottom electrode 15.Gap width is chosen as required.Electrode can be dull and stereotyped to dull and stereotyped, at plate, at pin, diagonal angle, angle, at the angle, at plate structure.Two electrodes 14,15 can be encapsulated in the insulator, with isolated from atmosphere; Also can directly make gap gas with air.
Claims (7)
1, a kind of overvoltage Limiting device of electric line, it is characterized in that device is made up of first resistance (3), second resistance (5), first electric capacity (4), second electric capacity (6), binding post (1), binding post (2), second electric capacity (6) two ends are parallel with second resistance (5), first resistance (3) two ends are parallel with first electric capacity (4), binding post (1) connects with first resistance (3) and first electric capacity (4), and binding post (2) connects with second electric capacity (6) and second resistance (5).
2, the overvoltage Limiting device of a kind of electric line according to claim 1, the resistance that it is characterized in that being connected in first resistance (3) between the electric line is non-linear.
3,, it is characterized in that first resistance (3) and first electric capacity (4) can be the structure capacitives of non-linear first resistance (3), also shunt capacitor according to the overvoltage Limiting device of claim 1,2 described a kind of electric line.
4, the overvoltage Limiting device of a kind of electric line according to claim 1 and 2, it is characterized in that first resistance (3), second resistance (5), first electric capacity (4) and second electric capacity (6) individual packages after, be connected in by the conducting wire again and use on the circuit.
5, the overvoltage Limiting device of a kind of electric line according to claim 1 and 2, after it is characterized in that first resistance (3), second resistance (5), first electric capacity (4) and second electric capacity (6) assembling, be encapsulated in the same insulating case, draw lead and link with using circuit.
6, the overvoltage Limiting device of a kind of electric line according to claim 3, it is characterized in that first resistance (3), second resistance (5), first electric capacity (4) and second electric capacity (6) individual packages after, be connected in by the conducting wire again and use on the circuit.
7, the overvoltage Limiting device of a kind of electric line according to claim 3, after it is characterized in that first resistance (3), second resistance (5), first electric capacity (4) and second electric capacity (6) assembling, be encapsulated in the same insulating case, draw lead and link with using circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200820228924U CN201378733Y (en) | 2008-12-18 | 2008-12-18 | Overvoltage limiting device of electric line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200820228924U CN201378733Y (en) | 2008-12-18 | 2008-12-18 | Overvoltage limiting device of electric line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201378733Y true CN201378733Y (en) | 2010-01-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200820228924U Expired - Fee Related CN201378733Y (en) | 2008-12-18 | 2008-12-18 | Overvoltage limiting device of electric line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201378733Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101767540A (en) * | 2010-03-12 | 2010-07-07 | 李子晗 | Switch-free switching auto-passing neutral section device for the electric railway |
| CN113067313A (en) * | 2021-04-08 | 2021-07-02 | 厦门Abb 避雷器有限公司 | Combined overvoltage limiter for AC metal closed switch cabinet |
-
2008
- 2008-12-18 CN CN200820228924U patent/CN201378733Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101767540A (en) * | 2010-03-12 | 2010-07-07 | 李子晗 | Switch-free switching auto-passing neutral section device for the electric railway |
| CN101767540B (en) * | 2010-03-12 | 2012-05-30 | 李子晗 | Switch-free switching auto-passing neutral section device for the electric railway |
| CN113067313A (en) * | 2021-04-08 | 2021-07-02 | 厦门Abb 避雷器有限公司 | Combined overvoltage limiter for AC metal closed switch cabinet |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100106 Termination date: 20101218 |