CN2386518Y - High power nonlinear resistor - Google Patents
High power nonlinear resistor Download PDFInfo
- Publication number
- CN2386518Y CN2386518Y CN 99229354 CN99229354U CN2386518Y CN 2386518 Y CN2386518 Y CN 2386518Y CN 99229354 CN99229354 CN 99229354 CN 99229354 U CN99229354 U CN 99229354U CN 2386518 Y CN2386518 Y CN 2386518Y
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- China
- Prior art keywords
- resistor
- metallic plate
- plate
- end plate
- screw rod
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- Expired - Fee Related
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Abstract
The utility model relates to a high power nonlinear resistor. Many nonlinear resistance sheets are connected in parallel under the good heat dissipation condition, and the structure is mainly composed of a plurality of nonlinear resistance sheets, a metal plate, fuse wires, a porcelain ring, a porcelain tube, a screw rod, the end plate and a support frame, wherein, every nonlinear resistance sheet uses two bigger metal plates to clamp two sides, and two metal plates are respectively connected with two buses with a conducting wire. The utility model has the advantages of novel and reasonable design, simple structure, practicality, safe and convenient use, etc., is most suitable for series connection of a damping resistance and an arc suppressing coil on a power supplying electric net, and is also suitable for scientific research and production departments.
Description
The utility model relates to a kind of resistor, and particularly a kind of and arc suppression coil is connected in series in the neutral point of power supply grid and the high-power damped resistor between the earth.
In the not directly grounded power supply grid of neutral point system, when single-phase earthing takes place when, will pass through system-wide capacitive earth current at earth point, this capacitance current is very big, can light electric arc in ground points, and can cause repeatedly scratch start again, and generation indirect arc overvoltage, the phase voltage of non-fault is further raise, just may make fault progression become phase fault or multipoint earthing short circuit in case damage insulation, accident can further enlarge.In order to reduce the capacitance current of earth point, usually adopt between the neutral point of transformer and ground and insert an arc suppression coil, when single-phase earthing takes place when, arc suppression coil can produce the inductive current that offsets with capacitance current, the electric current of earth point is reduced, after the blow-out in fault point, unlikely scratch start once more.But the degree of compensation of the inductive current of arc suppression coil must keep the overcompensation of the ratio of stipulating, do not allow to operate in full compensation and make it to be in resonance condition, do not allow to operate in the undercompensation state, in order to avoid in the electric grid operating process, resonance takes place because of the cut-out circuit yet.In order to make electrical network often be in best inductance compensation state, just need adjust inductive current according to the actual capacity of power-to-ground capacitance.Mainly take at present artificial and automatic two kinds of modes of regulating inductive current in the hope of keeping The optimal compensation, wherein, the workload of manual adjustment is too big, operation is frequent, and need know the electric network capacitance and current under the different running method in advance, and need often regulate the reactance value of arc suppression coil according to the variation of capacity current; In self-regulating device, the method that adopts damping resistance and arc suppression coil to be connected in series between neutral point and the earth avoids taking place resonance, at present mainly be to make damping resistance with the fixed resistance that is parallel with switch, utilize being switched on or switched off of automatic control switch, make fixed resistance when ground arc takes place by short circuit, when electrical network earth fault disappears, get back in the series circuit again, inductance and the issuable resonance of electrical network electric capacity over the ground to arc suppression coil play damping action, but because the corresponding hysteresis of action of switch, when making electric arc initial, can be can not get the compensation of due inductance current by short circuit immediately because of the resistance end; And when electrical network ground connection disappears, can return immediately in the series circuit because of the damping resistance end, make arc suppression coil may be in the state that produces resonance with electrical network electric capacity again, cause neutral point displacement voltage to raise easily.
The purpose of this utility model is in order to overcome the weak point of above-mentioned damping resistance because of using fixed resistance to produce, to design the most suitable a kind of high-power nonlinear resistor that can reduce resistance with the electric current increase automatically of making the electrical network damping resistance.
High-power nonlinear resistor of the present utility model, mainly be with many non-linear resistors in parallel use under good radiating condition, its structure is mainly by several non-linear resistors, metallic plate, fuse, the porcelain ring, porcelain tube, screw rod, end plate and support are formed, wherein, each non-linear resistor all is clamped on the both ends of the surface with two bigger metallic plates of diameter, metal-sheet edges has installing hole, porcelain tube is enclosed within on the screw rod, an end plate is respectively adorned at the screw rod two ends, end plate is contained on the support, the metallic plate that clamping has a non-linear resistor is on installing hole is installed in porcelain tube between the end plate, clamped the porcelain ring between the adjacent metal sheets, a metallic plate of each non-linear resistor is connected with a bus of resistor with lead, and another piece metallic plate is connected with another root bus earlier with after the fuse series connection with lead again.
Accompanying drawing 1 is the structural representation that the utility model middle part sub-resistance sheet is mounted to the resistance post;
Accompanying drawing 2 is circuit connecting relation figure of the present utility model.
Referring to accompanying drawing 1,1 among the figure is the nonlinear resistance sheet, the 2nd, and the metallic plate of resistor disc end face, this metallic plate can be selected the metallic plate of aluminium sheet or good heat conductivity such as aluminium alloy plate or copper coin for use, and the 3rd, porcelain tube, the 4th, screw rod, the 5th, porcelain ring, the 6th, end plate, the 7th, support.The edge of metallic plate 2 has installing hole, porcelain tube 3 is enclosed within on the screw rod 4, an end plate 6 is respectively adorned at screw rod 4 two ends, end plate 6 is contained on the support 7, the metallic plate 2 that clamping has a non-linear resistor 1 is on installing hole is installed in porcelain tube 3 between the end plate 6, clamped porcelain ring 5 between the adjacent metal sheets 2, to make it to form the air channel mainly be in order to increase area of dissipation metallic plate 2 being housed on the end face of resistor disc 1 and clamping porcelain ring 5 between adjacent two metallic plates, improve radiating condition, make non-linear resistor operate as normal under the situation of big electric current for a long time, if the operating current of design is more than tens amperes the time, just need a hundreds of above non-linear resistor parallel connection, at this moment, resistor disc can be divided into some groups, every group is mounted to above-mentioned resistance post, again that resistance post hierarchal arrangement is rack-mount, on the heat effects of arranging the resistance generation down, arrange resistance, can between two neighbouring row's resistance, install tilting thermal baffle additional, for withstand voltage lower resistor disc can be used in the very high circuit of voltage, several resistor discs can be connected in parallel again use the behind the withstand voltage high resistor disc earlier, in order to prevent to drench with rain and can keep the well-ventilated, the casing of venetian blind type can be installed in the support outside.Its circuit connecting relation as shown in Figure 2, with lead several non-linear resistor 1 parallel connections are used again by metallic plate 2, to increase running current, make it to reach powerful purpose, but in order to prevent to influence whole resistor because of the respective resistances sheet burns out short circuit, also, in the circuit of each resistor disc, all be in series with a fuse FU for the ease of maintenance.Owing to all have certain interelectrode capacitance between the two poles of the earth of each non-linear resistor, though this electric capacity is very little, but the interelectrode capacitance after a lot of resistor disc parallel connections will be become very big, in order to make this resistance become a pure resistance, can between two buses of resistor, be parallel with an inductance coil L, when the induction reactance of adjusting this inductance coil equates with the capacitive reactance of this resistor, can make this resistor become a pure resistance.Owing to be parallel with inductance coil L at the two ends of resistor, can make the better reliability of resistor, because if resistor disc complete bad time occurs, this inductance coil can not influence power grid security by offset current yet.
High power nonlinear resistor of the present utility model makes damping resistance and arc suppression coil is connected in series in the electrical network The property point and ground between because the variation of nonlinear damping resistor resistance is no time delay, electrical network is in the generation intermittence During the ground connection of ground connection or other type, can not take place affects arc extinguishing or causes high amplitude position because of the resistance retardation change Move voltage, so can make arc suppression coil can be adjusted at full compensating coefficient, provide for ensureing the electrical network normal operation New protection device has been opened up new purposes for nonlinear resistance again, and it is novel in design reasonable, simple in structure to have Practicality, the advantage such as safe and convenient to use, the most suitable power department uses, and also is fit to research and production department and uses.
Claims (3)
1. a high-power nonlinear resistor includes several non-linear resistors, it is characterized in that also including metallic plate, fuse, the porcelain ring, porcelain tube, screw rod, end plate and support, wherein, each non-linear resistor all is clamped on the both ends of the surface with two bigger metallic plates of diameter, metal-sheet edges has installing hole, porcelain tube is enclosed within on the screw rod, an end plate is respectively adorned at the screw rod two ends, end plate is contained on the support, the metallic plate that clamping has a non-linear resistor is on installing hole is installed in porcelain tube between the end plate, clamped the porcelain ring between the adjacent metal sheets, a metallic plate of each non-linear resistor is connected with a bus of resistor with lead, and another piece metallic plate is connected with another root bus earlier with after the fuse series connection with lead again.
2. high-power nonlinear resistor as claimed in claim 1 is characterized in that metallic plate is the metallic plate of the good heat conductivity of aluminium alloy plate, aluminium sheet or copper coin and so on.
3. high-power nonlinear resistor as claimed in claim 1 or 2 is characterized in that being parallel with an inductance coil between two buses of resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99229354 CN2386518Y (en) | 1999-09-03 | 1999-09-03 | High power nonlinear resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99229354 CN2386518Y (en) | 1999-09-03 | 1999-09-03 | High power nonlinear resistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2386518Y true CN2386518Y (en) | 2000-07-05 |
Family
ID=34018605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99229354 Expired - Fee Related CN2386518Y (en) | 1999-09-03 | 1999-09-03 | High power nonlinear resistor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2386518Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102903466A (en) * | 2012-11-06 | 2013-01-30 | 上海市电力公司 | Ventilation and heat dissipation device of high-capacity resistor |
-
1999
- 1999-09-03 CN CN 99229354 patent/CN2386518Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102903466A (en) * | 2012-11-06 | 2013-01-30 | 上海市电力公司 | Ventilation and heat dissipation device of high-capacity resistor |
| CN102903466B (en) * | 2012-11-06 | 2016-02-17 | 上海市电力公司 | A kind of high-capacity resistor ventilation heat abstractor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |