CN2362221Y - Arrester for distribution network - Google Patents
Arrester for distribution network Download PDFInfo
- Publication number
- CN2362221Y CN2362221Y CN 99219542 CN99219542U CN2362221Y CN 2362221 Y CN2362221 Y CN 2362221Y CN 99219542 CN99219542 CN 99219542 CN 99219542 U CN99219542 U CN 99219542U CN 2362221 Y CN2362221 Y CN 2362221Y
- Authority
- CN
- China
- Prior art keywords
- voltage transformer
- resistance
- distribution network
- lightning protection
- energy absorption
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to a harmony elimination lightning protection device of a substation for a distribution network in an electric power system, which comprises a voltage transformer. A damping resistor is arranged between a neutral point of a primary side of the voltage transformer and ground, an energy absorption loop is arranged between two terminals of an open-delta winding of a secondary side of the voltage transformer, the energy absorption loop comprises a resistor and a bridge rectifier which are connected in parallel, and another resistor and a capacitor which are connected in series are connected with the output end of the bridge rectifier. The harmony elimination lightning protection device for the distribution network has functions of harmony elimination and lightning protection and has the advantages of favorable effect and simple structure.
Description
The utility model relates to the harmonic elimination lightning protection device of transformer station in the system for distribution network of power.
In system for distribution network of power, normally on the bus of transformer station, voltage transformer device is housed, for power supply metering, system protection provide secondary power supply.When electrical network was subjected to being struck by lightning, system Lightning Over-voltage can occur and act on the voltage transformer device, because powerful overcurrent flows through voltage transformer device, thereby caused burning out or bursting of voltage transformer device, directly threatened the safe operation of electrical network.Sometimes in the electrical network also can because of moment parameter variation cause voltage resonance, make voltage transformer device bear strong resonance overvoltage, this strong resonance overvoltage produces strong overcurrent in voltage transformer device, this overcurrent also can cause burning out or bursting of voltage transformer device.In order to eliminate the superpotential harm of thunder and lightning and resonance, also proposed the product of relevant harmonic elimination or lightning protection on the market, but their common deficiency is: 1, harmonic elimination and lightning protection not only can not be had both simultaneously, and weak effect; 2, complex structure, the cost height; 3, useful life is short.
The purpose of this utility model provides a kind of harmonic elimination and lightning protection is had both simultaneously, power distribution network harmonic elimination lightning protection device effective, simple in structure.
This power distribution network harmonic elimination lightning protection device comprises voltage transformer, between voltage transformer primary side neutral point and ground, be connected to damping resistance, between two terminals of voltage transformer secondary side open-delta coil, be connected to the energy absorption loop, this energy absorption loop comprises resistance and the bridge rectifier in parallel with this resistance, the electric capacity that is connected to another resistance and connects with this resistance on the bridge rectifier output.
As to above-mentioned power distribution network harmonic elimination lightning protection device improvement, be parallel with discharge resistance at the two ends of electric capacity.
Power distribution network harmonic elimination lightning protection device described in the utility model, under normal operation, because three-phase voltage balance, potential difference between voltage transformer primary side neutral point and the ground is zero, potential difference between two terminals of voltage transformer secondary side open-delta coil also is zero, no current flows through damping resistance and energy absorption loop, and damping resistance that promptly increases newly and energy absorption loop are inoperative.When lightning voltage occurring, the three-phase voltage disequilibrium, bigger potential difference appears between voltage transformer primary side neutral point and the ground, because damping resistance and voltage transformer primary side constitute series loop, impedance in the loop is increased, electric current reduces, thereby has avoided burning out or bursting of voltage transformer.When resonance overvoltage occurring, three-phase voltage is disequilibrium also, bigger potential difference also appears between two terminals of voltage transformer secondary side open-delta coil, owing to have additional the energy absorption loop, make resonance become damped harmonic oscillation on the one hand, reduced the numerical value of this potential difference greatly, the potential difference that reduces greatly on the other hand produces shunting by the energy absorption loop, absorb the energy of resonant tank, thereby eliminate the harm that resonance produces.In the energy absorption loop, the effect of electric capacity is the energy that utilizes charging process fast Absorption moment resonance to be produced.
From the above mentioned, this power distribution network harmonic elimination lightning protection device not only possesses the function of harmonic elimination and lightning protection simultaneously, and effective.Since only increased by four resistance, a bridge rectifier and an electric capacity, thereby structure is simple especially, cost is low.
Accompanying drawing shows the circuit structure schematic diagram of power distribution network harmonic elimination lightning protection device embodiment.
In the present embodiment, power distribution network harmonic elimination lightning protection device comprises voltage transformer L, is connected to damping resistance R between voltage transformer L primary side neutral point O and ground
1, between two terminals M, N of voltage transformer L secondary side open-delta coil, being connected to the energy absorption loop, this energy absorption loop comprises a resistance R
2With with this resistance R
2Bridge rectifier D in parallel
1-D
4, in bridge rectifier D
1-D
4Output on be connected to the another resistance R
3With with this resistance R
3The capacitor C of series connection
1, in capacitor C
1Two ends be parallel with discharge resistance R
4
Claims (2)
1, a kind of power distribution network harmonic elimination lightning protection device comprises voltage transformer (L), is connected to damping resistance (R between voltage transformer (L) primary side neutral point (O) and ground
1), between two terminals (M, N) of voltage transformer (L) secondary side open-delta coil, being connected to the energy absorption loop, this energy absorption loop comprises a resistance (R
2) and with this resistance (R
2) bridge rectifier (D in parallel
1-D
4), at bridge rectifier (D
1-D
4) output on be connected to another resistance (R
3) and with this resistance (R
3) series connection circuit (C
1).
2, power distribution network harmonic elimination lightning protection device according to claim 1 is characterized in that at electric capacity (C
1) two ends be parallel with discharge resistance (R
4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99219542 CN2362221Y (en) | 1999-01-07 | 1999-01-07 | Arrester for distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99219542 CN2362221Y (en) | 1999-01-07 | 1999-01-07 | Arrester for distribution network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2362221Y true CN2362221Y (en) | 2000-02-02 |
Family
ID=34010440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99219542 Expired - Fee Related CN2362221Y (en) | 1999-01-07 | 1999-01-07 | Arrester for distribution network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2362221Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377680A (en) * | 2014-11-21 | 2015-02-25 | 国家电网公司 | Secondary alternating-current resonance elimination device used for electromagnetic type voltage transformer |
| CN104377679A (en) * | 2014-11-21 | 2015-02-25 | 国家电网公司 | Secondary direct-current resonance elimination device used for electromagnetic type voltage transformer |
-
1999
- 1999-01-07 CN CN 99219542 patent/CN2362221Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377680A (en) * | 2014-11-21 | 2015-02-25 | 国家电网公司 | Secondary alternating-current resonance elimination device used for electromagnetic type voltage transformer |
| CN104377679A (en) * | 2014-11-21 | 2015-02-25 | 国家电网公司 | Secondary direct-current resonance elimination device used for electromagnetic type voltage transformer |
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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 |