CN201774230U - Transformer neutral point over-voltage protection device - Google Patents
Transformer neutral point over-voltage protection device Download PDFInfo
- Publication number
- CN201774230U CN201774230U CN2010202920903U CN201020292090U CN201774230U CN 201774230 U CN201774230 U CN 201774230U CN 2010202920903 U CN2010202920903 U CN 2010202920903U CN 201020292090 U CN201020292090 U CN 201020292090U CN 201774230 U CN201774230 U CN 201774230U
- Authority
- CN
- China
- Prior art keywords
- neutral point
- gap
- transformer
- moa
- clearance
- 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
Links
Abstract
The utility model discloses a transformer neutral point over-voltage protection device, which comprises a main clearance, a control clearance, an MOA, a grounded isolating switch, a lightning arrester monitor, a current transformer and the like. The main clearance is a discharging clearance consisting of a pair of stainless steel (or copper) spherical electrodes connected in series with a voltage equalizing resistor, the main clearance is mounted on a supporting post insulator in a connected manner by angular flat steel, one end of the main clearance is connected to a neutral point N of a transformer Tp via a conductive pole while the other end is connected in series with the control clearance prior to being connected in parallel with the MOA in series connection with the monitor, and the grounded isolating switch is connected in parallel with the MOA in series connection with the monitor. The transformer neutral point over-voltage protection device accurately controls discharging voltage of the control clearance by the aid of respective volt-ampere characteristics of a linear resistor and a nonlinear resistor, is stable in discharging voltage and small in dispersiveness, overcomes the shortcomings of large clearance discharging dispersiveness, unstable discharging and easy malfunction in the prior art, and makes full use of the respective protection functions of the MOA and the clearances.
Description
Technical field
The utility model relates to a kind of overvoltage protection, is specially a kind of the complete sets of equipment of transformer neutral point overvoltage protection, belongs to the overvoltage protection field of electric power system.
Background technology
In the earth neutral system of China 110kV and above electrical network,, prevent from the earth-free operational mode of part transformer neutral point is often taked in the requirements such as configuration of adjusting of the interference of communication and protective relaying device in order to limit single-phase short circuit current.In addition, in a certain annular or radiation type electric supply network, scheduling needs the control direction of tide in order to move, and then has a mind to arrange the neutral point of a certain centre or terminal transformer to move in earth-free mode.These transformer neutral point insulation levels are more much lower than the insulation level of holding mutually, protect so neutral point must add.Traditional protected mode is with silicon carbide valve type arrester and rod
The rod gap Combined Protection device that constitutes in parallel.When lightning overvoltage appears in the neutrality point, take defencive function by lightning arrester, when temporary overvoltage appears in neutral point, take defencive function by rod-rod gap.And in implementation process, be difficult to accomplish cooperate rationally between this three of flash-over characteristic of transformer neutral point insulation level and protection of arrester level and rod-rod gap action, often attend to one thing and lose sight of another.For example, select the impulse sparkover voltage of lightning arrester and the requirement that residual voltage has satisfied the transformer neutral point insulation, then its extinguishing voltage is on the low side again, and the blocking power frequency continued flow is difficulty just, accident-proneness; If select higher leveled extinguishing voltage, then its impulse sparkover voltage and residual voltage can not satisfy the requirement of insulation coordination again.And very difficult kind to the greatest extent cooperation of volt-second characteristic with carborundum lightning arrester action (interior string gap discharge) of the volt-second characteristic of rod-rod gap discharge, because rod
The dispersiveness of rod gap discharge is big, and often misoperation causes full station power outage.
Along with progress of science and technology, the gapless metal-oxide lighting arrester (hereinafter to be referred as MOA) that has been extensive use of the nonlinear characteristic excellence nineties has replaced silicon carbide valve type arrester, just there has not been extinguishing voltage and power frequency continued flow blocking problem, the protection level of MOA and transformer neutral point insulation level be combined with very big flexibility, as long as the rated voltage of MOA is selected appropriate, insulation coordination can not get into trouble basically; Because MOA is an arrester without gaps, does not also just have impulse sparkover voltage and power-frequency sparkover voltage problem, then do not exist and rod
The volt-second characteristic matching problem of rod gap discharge.Though MOA has the ability that suppresses temporary overvoltage, but when system loses partial earthing (lost territory), cause the high-frequency resonant temporary overvoltage, no matter be ferro-resonance over-voltage or frequency multiplication resonance overvoltage and the situations such as non-operation mutually of following appearance, thermal runaway does not just take place because of tolerance lives this type of overvoltage (longer duration) in MOA.So, allow the gap take the function of the above-mentioned temporary overvoltage of protection at present still with the protected mode of excellent gap or sphere gap combination in parallel with MOA.But this gap is single gap, and its fatal shortcoming is: discharge instability, discharge voltage is dispersed big, has often because of its misoperation power outage that causes standing entirely to take place.
Summary of the invention
The purpose of this utility model is to provide a kind of the complete sets of equipment of transformer neutral point overvoltage protection, to overcome the above-mentioned defective of prior art.
Purpose of the present invention can be achieved through the following technical solutions.
A kind of transformer neutral point overvoltage protection comprises main gap, control gap, gapless metal-oxide lighting arrester (MOA), earthing isolator, lightning arrester monitor, current transformer etc.; Described main gap is that the discharging gap of a pair of stainless steel (or copper) spheric electrode formation is in parallel with a grading resistor A, and is connected and installed on the post insulator by the dihedral band steel; Wherein, an end of main gap is connected in the neutral point N of transformer Tp by conducting rod, and the other end and control gap are connected in series and are connected in parallel with the MOA that is in series with monitor; Control gap is that ignition gap and the grading resistor B that a pair of stainless steel (or copper) spheric electrode constitutes is connected in parallel, and being connected in series with current transformer is installed on the ground connection base again; One earthing isolator is connected in parallel with the MOA that is in series with monitor, is used to change the neutral point operational mode; Described ground connection base good earth.
Described grading resistor is nonlinear resistance and is sealed in the insulating cylinder.
Described grading resistor is linear resistance and is sealed in the insulating cylinder.
The electrode of described discharging gap and ignition gap can be solid sphere, hollow ball shape, hemisphere or erietiform electrode etc.
Described current transformer is a zero sequence current mutual inductor.
Described ignition gap can be vacuum switch.
Described lightning arrester detector can be substituted by the discharge register.
Advantage of the present utility model
1) utilized the characteristics of linear resistance and nonlinear resistance voltage-current characteristic separately dexterously, made the discharge voltage controllable adjustment in gap, the discharge voltage dispersiveness is little, stable performance, accuracy height;
2) given full play to discharging gap and MOA protection advantage separately, under lightning overvoltage and switching overvoltage, MOA takes defencive function, and components of system as directed lost territory, open-phase operation appear in a load, when causing the high-frequency resonant overvoltage of longer duration, the gap precision maneuver is born the defencive function of ferro resonance or high frequency, frequency multiplication resonance overvoltage;
3) an excellent rod gap discharge point and arcing point have been overcome in same point, easily by the defective of arc erosion;
4) complete sets of equipment, compact conformation, convenient for installation and maintenance.
Description of drawings
Fig. 1 is the typical scheme of installation of an embodiment of the utility model.
Among the figure: 1, main gap 2, discharging gap 3, grading resistor 4, control gap 5, ignition gap 6, current transformer 7, grading resistor 8, post insulator 9, ground connection base 10, insulator foot 11, monitor 12, MOA 13, earthing isolator 14, dihedral band steel.
Embodiment
Below in conjunction with the drawings and specific embodiments design feature of the present utility model is further described.
A kind of transformer neutral point overvoltage protection as shown in Figure 1 comprises main gap 1, control gap 4, MOA12, earthing isolator 13, monitor 11, current transformer 6 etc.; Comprise in main gap 1 frame of broken lines that the discharging gap 2 that a pair of stainless steel (or copper) spheric electrode constitutes is connected in parallel with grading resistor A3, be installed on the post insulator 8 that post insulator is installed on the ground connection base 9 by dihedral band steel 14; The neutral point N that the upper end of left side spheric electrode connecting rod and MOA12 and earthing isolator 13 links together and is connected to transformer Tp; The right spheric electrode connecting rod and control gap 4 are connected in series.Comprise in control gap 4 frame of broken lines that again with electric current mutual inductance 6 be connected in series in parallel with grading resistor B7 of ignition gap 5 that a pair of stainless steel (or copper) spheric electrode constitutes is installed on the ground connection base 9.MOA12 is installed on the insulator foot 10, and lightning arrester monitor 11 is connected with MOA and is installed in parallel on ground connection base 9 with insulator foot 10.Earthing isolator 13 lower ends are fixed on the ground connection base 9, ground connection base 9 good earths.Under the usual situation, earthing isolator 13 is in open position.When lightning overvoltage and the invasion of general operation overvoltage, the MOA12 action absorbs and discharges the overvoltage energy, and its evil, gap akinesia are in such cases avoided in the insulation of protection transformer neutral point.
And when when system temporary overvoltages such as ferro resonance, high-frequency resonant having taken place; control gap 4 precision maneuvers (ignition gap 5 disruptive discharges); overvoltage is all fallen on main gap 1; discharging gap 2 is in company with disruptive discharge; the overvoltage energy is released in the ground, and the operation of transformer neutral point transient earthing prevents the accident sustainable development; in time cut off the electricity supply, and protection MOA12 exempts producing of thermal runaway accident.
Claims (6)
1. a transformer neutral point overvoltage protection comprises main gap, control gap, MOA, earthing isolator, lightning arrester monitor summation current transformer; Described main gap is that the discharging gap of a pair of stainless steel or copper ball shape electrode formation is in parallel with a grading resistor A, and is connected and installed on the post insulator by the dihedral band steel; Wherein, an end of main gap is connected in the neutral point N of transformer Tp by conducting rod, and the other end and control gap are connected in series and are connected in parallel with the MOA that is in series with monitor 11; Control gap is that ignition gap and the grading resistor B that a pair of stainless steel or copper ball shape electrode constitute is connected in parallel, and being connected in series with current transformer is installed on the ground connection base again; One earthing isolator is connected in parallel with the MOA that is in series with monitor; Ground connection base ground connection.
2. according to the described a kind of transformer neutral point overvoltage protection of claim 1, it is characterized in that: described grading resistor A is nonlinear resistance and is sealed in the insulating cylinder.
3. according to the described a kind of transformer neutral point overvoltage protection of claim 1, it is characterized in that: described grading resistor B is linear resistance and is sealed in the insulating cylinder.
4. according to the described a kind of transformer neutral point overvoltage protection of claim 1, it is characterized in that: the electrode of described discharging gap and ignition gap is solid sphere, hollow ball shape, hemisphere or erietiform electrode.
5. according to the described a kind of transformer neutral point overvoltage protection of claim 1, it is characterized in that: described current transformer is a zero sequence current mutual inductor.
6. according to the described a kind of transformer neutral point overvoltage protection of claim 1, it is characterized in that: described ignition gap can be vacuum switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202920903U CN201774230U (en) | 2010-08-13 | 2010-08-13 | Transformer neutral point over-voltage protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202920903U CN201774230U (en) | 2010-08-13 | 2010-08-13 | Transformer neutral point over-voltage protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201774230U true CN201774230U (en) | 2011-03-23 |
Family
ID=43754067
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202920903U Expired - Fee Related CN201774230U (en) | 2010-08-13 | 2010-08-13 | Transformer neutral point over-voltage protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201774230U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102315596A (en) * | 2011-09-02 | 2012-01-11 | 四川省电力公司绵阳电业局 | Transformer neutral point coupling mechanism |
| CN102629759A (en) * | 2012-05-09 | 2012-08-08 | 辽宁省电力有限公司沈阳供电公司 | Lightning protection clearance type grounding device |
| CN103269058A (en) * | 2013-06-13 | 2013-08-28 | 哈尔滨理工大学 | Controllable gap, and device and method for protecting neutral point of 110KV transformer based on controllable gap |
| CN103414157A (en) * | 2013-08-22 | 2013-11-27 | 深圳供电局有限公司 | Device for operation of protective gap of transformer neutral point |
| WO2014166262A1 (en) * | 2013-04-09 | 2014-10-16 | 国家电网公司 | Overvoltage protection device and protection method for alternating-current side of flexible direct-current power transmission system |
| CN105048411A (en) * | 2015-09-06 | 2015-11-11 | 国家电网公司 | 220 kV transformer neutral point gap action control device and method |
| CN109461554A (en) * | 2018-10-12 | 2019-03-12 | 温州益坤电气股份有限公司 | A kind of parallel resistance gap over-pressure safety device |
-
2010
- 2010-08-13 CN CN2010202920903U patent/CN201774230U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102315596A (en) * | 2011-09-02 | 2012-01-11 | 四川省电力公司绵阳电业局 | Transformer neutral point coupling mechanism |
| CN102629759A (en) * | 2012-05-09 | 2012-08-08 | 辽宁省电力有限公司沈阳供电公司 | Lightning protection clearance type grounding device |
| WO2014166262A1 (en) * | 2013-04-09 | 2014-10-16 | 国家电网公司 | Overvoltage protection device and protection method for alternating-current side of flexible direct-current power transmission system |
| CN103269058A (en) * | 2013-06-13 | 2013-08-28 | 哈尔滨理工大学 | Controllable gap, and device and method for protecting neutral point of 110KV transformer based on controllable gap |
| CN103414157A (en) * | 2013-08-22 | 2013-11-27 | 深圳供电局有限公司 | Device for operation of protective gap of transformer neutral point |
| CN103414157B (en) * | 2013-08-22 | 2016-06-08 | 深圳供电局有限公司 | A kind of device of operation of protective gap of transformer neutral point |
| CN105048411A (en) * | 2015-09-06 | 2015-11-11 | 国家电网公司 | 220 kV transformer neutral point gap action control device and method |
| CN109461554A (en) * | 2018-10-12 | 2019-03-12 | 温州益坤电气股份有限公司 | A kind of parallel resistance gap over-pressure safety device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201774230U (en) | Transformer neutral point over-voltage protection device | |
| Podporkin et al. | Overhead lines lightning protection by multi-chamber arresters and insulator-arresters | |
| CN103474940A (en) | Comprehensive lightning protection system of electric transmission lines of high tower of power grid | |
| RU2657009C1 (en) | Tank switch with a surge arrester connected through the insulating sleeves of each end | |
| CN104600567A (en) | Alternating current electric transmission line lightning flashover restriction method and device | |
| CN201608508U (en) | Transformer neutral point rod gap protection device | |
| CN202197100U (en) | Transformer neutral point grounding protection device | |
| CN203180510U (en) | Combined overvoltage protector of resistance capacitance lightening arrester | |
| CN2852338Y (en) | Composite casing zinc oxide lightning arrester | |
| CN203086121U (en) | Falling type lightning arrester structure | |
| CN201845648U (en) | Primary resonance eliminator | |
| CN202513569U (en) | Transformer neutral point overvoltage protector | |
| CN214479607U (en) | Combined overvoltage limiter for AC metal closed switch cabinet | |
| Gao et al. | Protection of series compensation station against lightning intruded wave in 1000kV AC transmission system | |
| CN203673900U (en) | 10 kV distribution circuit lightning protection apparatus | |
| CN205429713U (en) | Over -voltage protector | |
| CN201514819U (en) | Lightning protection insulator for insulated conductor for overhead line | |
| CN201388042Y (en) | Central high-voltage switch equal-height cabinet | |
| CN205248019U (en) | Arrester for electric power | |
| CN202145399U (en) | Lightning arrester for protecting transformer neutral point for ungrounded neutral system | |
| CN202473454U (en) | Composite insulated zinc oxide arrester | |
| CN204694796U (en) | Surge arrester failure indicating device | |
| CN214626357U (en) | Self-adaptive neutral point grounding device of 3kV-66kV power distribution system | |
| CN102543335A (en) | Composite insulated zinc oxide lightning arrester | |
| CN204517399U (en) | Low residual voltage interstitial structure zinc oxide arrester arranged side by side |
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: 20110323 Termination date: 20120813 |