CN204230878U - A kind of ice-melt resonance overvoltage restraining device - Google Patents
A kind of ice-melt resonance overvoltage restraining device Download PDFInfo
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- CN204230878U CN204230878U CN201420648925.2U CN201420648925U CN204230878U CN 204230878 U CN204230878 U CN 204230878U CN 201420648925 U CN201420648925 U CN 201420648925U CN 204230878 U CN204230878 U CN 204230878U
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Abstract
The utility model discloses a kind of ice-melt resonance overvoltage restraining device, in order to access the unsettled phase conductor end of direct current ice melting system, include switching disconnecting link, capacitor, resistor, post insulator and ground lead, one end of described switching disconnecting link and the unsettled phase conductor end of direct current ice melting system, the other end and above-mentioned capacitor, resistor and the ground lead of switching disconnecting link are in series successively, the other end ground connection of ground lead.In the unsettled phase conductor of a kind of ice-melt resonance overvoltage restraining device access ice-melt of the present utility model; change unsettled phase conductor parameter; can suppress the unsettled phase resonance overvoltage of direct current ice melting system in deicing processes, protection DC de-icing device damages from resonance overvoltage.
Description
Technical field
The utility model relates to the protective device of grid power transmission circuit deicing device, is specifically related to a kind of ice-melt resonance overvoltage restraining device.
Background technology
Within 2008, ice damage causes comparatively havoc to electrical network, for improving the ability of grid power transmission circuit reply freezing disaster weather, has installed DC de-icing device after 08 year in the many transformer stations of electrical network.The ice-melt power supply of DC de-icing device is generally taken from and is treated to take goddess of lightning's line in DC ice-melting transformer station, is generally 35kV or 220kV electric pressure.AC energy accesses icing circuit and carries out ice-melt after the rectifier transformer of direct current ice melting system and silicon controlled rectifier are transformed into direct current energy.When DC de-icing device carries out ice-melt, treat that the mode of connection of DC ice-melting and DC de-icing device can adopt 1-1 ice-melt mode, i.e. two-phase cascade, above-mentioned DC de-icing device with treat that DC ice-melting forms direct current ice melting system, in this circuit far-end or offside transformer station by three-phase short circuit, as shown in Figure 1,1-1 pattern also exists A phase or the unsettled 2 kinds of connections of C phase.When adopting 1-1 pattern ice-melt, unsettled phase will be there will be, as unsettled in the B phase conductor one end in Fig. 1.
Pulse deicing devices under 1-1 pattern during ice-melt for 12, and DC de-icing device will produce 6K subharmonic.When unsettled phase conductor natural frequency is near 6 secondary frequencies, 6 subharmonic that DC de-icing device produces will form higher resonance overvoltage on wire.Existing DC de-icing device is many to be directly connected with circuit phase selection disconnecting link mutually by unsettled, when line parameter circuit value exists 6 resonance frequencys, when ice-melt, 6 subharmonic that DC de-icing device produces will cause the punch through damage such as DC side lightning arrester, DC voltage transformer, circuit phase selection disconnecting link, busbar support insulator.
Utility model content
The purpose of this utility model is to overcome above-mentioned deficiency, provides a kind of can realization to suppress the superpotential device of the unsettled phase resonance of deicing device.
For reaching the object of above-mentioned utility model, the utility model is achieved through the following technical solutions:
A kind of ice-melt resonance overvoltage restraining device of the present utility model, in order to access the unsettled phase conductor end of direct current ice melting system, include switching disconnecting link, capacitor, resistor, post insulator and ground lead, one end of described switching disconnecting link and the unsettled phase conductor end of direct current ice melting system, the other end and above-mentioned capacitor, resistor and the ground lead of switching disconnecting link are in series successively, the other end ground connection of ground lead.
Above-mentioned capacitor is for changing wire resonance frequency, and capacitance is chosen and resonance frequency should be avoided near 12 times, 18 inferior harmonic frequencies.
Theoretically, only need change unsettled phase conductor parameter, changing wire resonance point frequency can produce effectively suppression to the unsettled phase overvoltage of deicing device.Below set forth the 6 × LGJ300/40 wire for 145km, but the unsettled phase conductor that ice-melt resonance overvoltage restraining device of the present utility model is applied to is not limited to this wire type.The distributed constant equivalent resistance of above-mentioned wire is 2.3 Ω, and equivalent reactance is 0.1071H, and equivalent capacity is 2.422uF, according to resonance equation:
Calculate f=312, close with 6 subfrequencies, consider distributed constant and the error of calculation, 6 subharmonic will produce resonance overvoltage.
According to capacitance calculation formula:
Known resonance frequency is the closer to order harmonic frequencies, and capacitor electrode capacitance is less.So only need consider that the capacitance of resonance frequency not when 2 subfrequency can meet the inhibitory action to all subharmonic.With above-mentioned equivalent reactance for 0.1071H is described, now capacitance C=23.6uF, considers certain nargin and integrated economics, recommends capacitance within the interval of [25,30] uF.
Above-mentioned resistor is used for providing unsettled phase current potential to support.The DC voltage level of resistance value according to DC de-icing device and the neutral ground overcurrent protection by DC de-icing device are determined, and consider economy.
The switch operation of above-mentioned switching disconnecting link, by ice-melt resonance overvoltage restraining device access direct current ice melting system.
Above-mentioned post insulator, insulate in order to capacitor, resistor and switching disconnecting link and ground to be formed, and considers direct current line voltage grade determination insulation level.
Above-mentioned ground lead, for by ice-melt resonance overvoltage restraining device ground connection.
Compared with prior art, the utility model tool has the following advantages:
In the unsettled phase conductor of a kind of ice-melt resonance overvoltage restraining device access ice-melt of the present utility model; change unsettled phase conductor parameter; can suppress the unsettled phase resonance overvoltage of direct current ice melting system in deicing processes, protection DC de-icing device damages from resonance overvoltage.
Accompanying drawing explanation
Fig. 1 is the 1-1 pattern diagram of direct current ice melting system.
Fig. 2 is the schematic diagram of ice-melt resonance overvoltage restraining device of the present utility model access direct current ice melting system.
Fig. 3 is the schematic diagram of ice-melt resonance overvoltage restraining device of the present utility model.
Fig. 4 is the RTDS simulation result of ice-melt resonance overvoltage restraining device of the present utility model access direct current ice melting system.
Embodiment
Be clearly and completely described the technical scheme in the utility model embodiment below in conjunction with drawings and Examples, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiment.
Refer to Fig. 2 and Fig. 3, Fig. 2 is the schematic diagram for ice-melt resonance overvoltage restraining device access direct current ice melting system of the present utility model, Fig. 3 is the schematic diagram of ice-melt resonance overvoltage restraining device of the present utility model, Fig. 3 is as an embodiment of ice-melt resonance overvoltage restraining device of the present utility model, and the ice-melt resonance overvoltage restraining device 200 of this embodiment includes capacitor 202, resistor 203, switching disconnecting link 201, post insulator and ground lead 204; One end of above-mentioned switching disconnecting link 201 connects with unsettled phase one end of direct current ice melting system, in this embodiment, three-phase line shown in Fig. 2: A phase conductor 101, B phase conductor 102 and C phase conductor 103, in the middle of, the silicon controlled rectifier 301 of one end access DC de-icing device 300 of A phase conductor 101 and C phase conductor 103, this A phase conductor 101 and C phase conductor 103 are at the shorted on one end of the other end and B phase conductor 102, and now the other end of B phase conductor 102 is unsettled.Therefore in Fig. 3, the free end electrical connection of one end access B phase conductor 102 of the switching disconnecting link 201 of ice-melt resonance overvoltage restraining device 200.The other end of this switching disconnecting link 201 is connected with one end of capacitor 202, and the other end of capacitor 202 is connected with one end of resistor 203, and one end of the other end ground lead 204 of resistor 203 connects, the other end ground connection of ground lead 204.
Fig. 4 is the RTDS simulation result for ice-melt resonance overvoltage restraining device access direct current ice melting system of the present utility model.From simulation result; ice-melt resonance overvoltage restraining device of the present utility model is after the moment of T shown in dotted line accesses direct current ice melting system; in the C phase conductor of access DC de-icing device 300, resonance potential frequency is taken into account magnitude of voltage and is significantly reduced, thus makes DC de-icing device protected.
Ice-melt resonance overvoltage restraining device of the present utility model; unsettled phase conductor parameter is changed by the parameter value of varying capacitors and resistor; can suppress the unsettled phase resonance overvoltage of deicing device in deicing processes, protection deicing device damages from resonance overvoltage.
Above-described embodiment only in order to the utility model is described and and technical scheme described by unrestricted the utility model; Therefore, although this specification has been described in detail the utility model with reference to each above-mentioned embodiment, those of ordinary skill in the art should be appreciated that and still can modify to the utility model or equivalent replacement; And all do not depart from technical scheme and the improvement thereof of spirit and scope of the present utility model, it all should be encompassed in the middle of right of the present utility model.
Claims (1)
1. an ice-melt resonance overvoltage restraining device, in order to access the unsettled phase conductor end of direct current ice melting system, it is characterized in that: include switching disconnecting link, capacitor, resistor, post insulator and ground lead, one end of described switching disconnecting link and the unsettled phase conductor end of direct current ice melting system, the other end and above-mentioned capacitor, resistor and the ground lead of switching disconnecting link are in series successively, the other end ground connection of ground lead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420648925.2U CN204230878U (en) | 2014-10-31 | 2014-10-31 | A kind of ice-melt resonance overvoltage restraining device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420648925.2U CN204230878U (en) | 2014-10-31 | 2014-10-31 | A kind of ice-melt resonance overvoltage restraining device |
Publications (1)
| Publication Number | Publication Date |
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| CN204230878U true CN204230878U (en) | 2015-03-25 |
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| CN201420648925.2U Active CN204230878U (en) | 2014-10-31 | 2014-10-31 | A kind of ice-melt resonance overvoltage restraining device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115498582A (en) * | 2022-10-21 | 2022-12-20 | 国网湖南省电力有限公司 | Uninterrupted ground wire direct-current ice melting system and method for ultra-high voltage transmission line |
-
2014
- 2014-10-31 CN CN201420648925.2U patent/CN204230878U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115498582A (en) * | 2022-10-21 | 2022-12-20 | 国网湖南省电力有限公司 | Uninterrupted ground wire direct-current ice melting system and method for ultra-high voltage transmission line |
| CN115498582B (en) * | 2022-10-21 | 2024-06-11 | 国网湖南省电力有限公司 | Uninterrupted ground wire direct-current deicing system and uninterrupted ground wire direct-current deicing method for ultra-high voltage transmission line |
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