CN105655998A - Low-voltage side neutral point FACTS (flexible alternating current transmission systems) grounding device of 110kV transformer - Google Patents
Low-voltage side neutral point FACTS (flexible alternating current transmission systems) grounding device of 110kV transformer Download PDFInfo
- Publication number
- CN105655998A CN105655998A CN201610203414.3A CN201610203414A CN105655998A CN 105655998 A CN105655998 A CN 105655998A CN 201610203414 A CN201610203414 A CN 201610203414A CN 105655998 A CN105655998 A CN 105655998A
- Authority
- CN
- China
- Prior art keywords
- controllable silicon
- grounding
- neutral point
- facts
- grounding device
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
Abstract
A low-voltage side neutral point FACTS grounding device of an 110kV transformer comprises a lightning arrester B, a rectifying bridge ZL, a first silicon controlled rectifier G1, a second silicon controlled rectifier G2, an inductance coil L, a resistor R and a controller K. The low-voltage side neutral point FACTS grounding device of the 110kV transformer has the advantages that after a main transformer is connected with the grounding device, the main transformer may quickly and effectively adapt to changes in operation of a power grid, various grounding modes are equivalently obtained, it is therefore possible to greatly save installation cost of the grounding device and reduce engineering investment, most suitable adjustments are made to the grounding modes, and great supportive action is provided for the operational safety of the power grid.
Description
Technical field
The invention belongs to 110kV low-tension side of power transformer neutral ground technical field, particularly relate to a kind of 110kV step down side neutral point FACTS grounding device.
Background technology
The neutral grounding mode of power system and power equipment has: earth-free (insulation), resistance grounded (resistor box), through reactance grounded, through grounding through arc (resonance ground connection), be directly grounded etc. several. For main operation characteristic, various earthing modes can be summarized as two big classes:
One class is so-called ground current system or effective grounding system, including neutral-point solid ground and through little impedance earth;
Another kind of is so-called small grounding current system, and including isolated neutral with through grounding through arc, and those neutral points are limited to the system of relatively decimal through big impedance earth thus earth current.
The low-pressure side of 110kV transformator is generally 10kV or 35kV, and the neutral grounding mode of the two electric pressure mainly has three kinds: earth-free, resonance grounding and resistance eutral grounding. The earth-fault current of isolated neutral mode is little, it is allowed to operate with failure for a long time, but is likely to result in the problem of intermittent arc grounding overvoltage, thus causing fault spread; Neutral point resonance neutral grounding can make fault residual current reduce, and reaches the purpose of quick blow-out, but is difficult to failure line selection for permanent fault and quickly positions; Neutral Grounding through Resistance in Electrical can effectively prevent resonance overvoltage and intermittent arc grounding overvoltage, but potential to ground may be caused to raise, and causes Communication Jamming, jeopardizes person equipment safety.
Three of the above earthing mode all suffers from same problem: cannot promptly adjust flexibly when needs earthing mode changes.
Summary of the invention
In order to solve the problems referred to above, it is an object of the invention to provide a kind of 110kV step down side neutral point FACTS grounding device.
In order to achieve the above object, 110kV step down side neutral point FACTS grounding device provided by the invention includes: spark gap B, rectifier bridge ZL, the first controllable silicon G1, the second controllable silicon G2, inductance coil L, resistor R and controller K; Wherein: one end of spark gap B is connected with step down side neutral point Y0, the other end is connected with grounding body G, rectifier bridge ZL is the full-controlled rectifier bridge being made up of four thyristors, terminal 1 thereon is connected with neutral point Y0, terminal 2 is connected with grounding body G, terminal 3 is connected with the anode of the first controllable silicon G1, terminal 4 is connected with the negative electrode of the second controllable silicon G2, the anode of the first controllable silicon G1 negative electrode and the second controllable silicon G2 connects, inductance coil L and the first controllable silicon G1 is in parallel, and resistor R and the second controllable silicon G2 is in parallel;Six outfans of controller K are connected with the control pole of four thyristors of the first controllable silicon G1, the second controllable silicon G2 and composition rectifier bridge ZL respectively, the input of controller K is connected with Substation Station control layer network, transformer station secondary system be made directly control.
The effect of 110kV step down side neutral point FACTS grounding device provided by the invention: after main transformer connects this grounding device, can fast and effeciently adapt to the change of grid operating conditions, equivalence becomes diversified earthing mode, such that it is able to significantly save the mounting cost of grounding device, reduce construction investment, and earthing mode is made optimal adjustment, the safe operation of electrical network is also had great supporting role.
Accompanying drawing explanation
Fig. 1 is low-tension side of power transformer neutral grounding by small resistance mode electric hookup.
Fig. 2 is the electric hookup of low-tension side of power transformer neutral point FACTS earthing mode.
Fig. 3 is 110kV step down side neutral point FACTS grounding device constructions schematic diagram provided by the invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, 110kV step down side neutral point FACTS grounding device provided by the invention is described in detail.
The earthing mode of 110kV step down side neutral point FACTS grounding device provided by the invention is consistent with the conventional low resistance grounding mode shown in Fig. 1, the position of the earth resistance R1 namely connected with grounding transformer T-phase in Fig. 1 is the installation site of this grounding device, and the electrical wiring form after installation is as shown in Figure 2.
As it is shown on figure 3,110kV step down side neutral point FACTS grounding device provided by the invention includes: spark gap B, rectifier bridge ZL, the first controllable silicon G1, the second controllable silicon G2, inductance coil L, resistor R and controller K; Wherein: one end of spark gap B is connected with step down side neutral point Y0, the other end is connected with grounding body G, rectifier bridge ZL is the full-controlled rectifier bridge being made up of four thyristors, terminal 1 thereon is connected with neutral point Y0, terminal 2 is connected with grounding body G, terminal 3 is connected with the anode of the first controllable silicon G1, terminal 4 is connected with the negative electrode of the second controllable silicon G2, the anode of the first controllable silicon G1 negative electrode and the second controllable silicon G2 connects, inductance coil L and the first controllable silicon G1 is in parallel, and resistor R and the second controllable silicon G2 is in parallel; Six outfans of controller K are connected with the control pole of four thyristors of the first controllable silicon G1, the second controllable silicon G2 and composition rectifier bridge ZL respectively, the input of controller K is connected with Substation Station control layer network, transformer station secondary system be made directly control.
Described controller K possesses human-computer interaction interface, current earthing mode can be manually set and control logic, for the Trigger Angle of rectifier bridge ZL being controlled and conducting and shutoff to the first controllable silicon G1 and the second controllable silicon G2 is controlled; It addition, the everything of this device is all complete under the control of controller K.
The effect of described spark gap B is to prevent the overvoltage such as thunderbolt from being punctured by thyristor, shields.
The effect of described rectifier bridge ZL can be by controlling Trigger Angle to adjust the size of input current, plays parameter adjustment effect, and when Trigger Angle is 90 ��, the earthing mode of this device is earth-free.
The first described controllable silicon G1 and the second controllable silicon G2 is composed in series short circuit brachium pontis, and its effect is respectively inductance coil L and resistor R can be carried out short circuit, plays the effect that earthing mode adjusts.When utilizing controller K to control the first controllable silicon G1 conducting, when the second controllable silicon G2 disconnects, the first controllable silicon G1 is by inductance coil L both sides short circuit, and the FACTS earthing mode of this device is resistance eutral grounding; When controlling the second controllable silicon G2 conducting, when the first controllable silicon G1 disconnects, the second controllable silicon G2 is by resistor R both sides short circuit, and the FACTS earthing mode of this device is grounding through arc or is called resonance grounding; When controlling the first controllable silicon G1, the second controllable silicon G2 is when being both turned on, and the FACTS earthing mode of this device is for being directly grounded.
The earthing mode of 110kV step down side neutral point FACTS grounding device provided by the invention can switch neatly under various earthing modes; and the Trigger Angle change that can pass through rectifier bridge ZL carries out quick parameter adjustment; therefore this grounding device has great motility; this grounding device combines can also reach good protected effect with protection device, line selection apparatus simultaneously, and then ensures optimum operation of power networks benefit.
The present invention constitutes rectifier bridge ZL based on FACTS element, reaches to change the purpose of ground connection parameter by changing the Trigger Angle of rectifier bridge ZL. Simultaneously; the present invention considers the factors such as thunderbolt and overvoltage; for preventing voltage from raising, thyristor is punctured; one group of spark gap B in parallel on the AC brachium pontis of rectifier bridge ZL; before voltage is increased to controllable silicon breakdown voltage; spark gap B is utilized overvoltage to be eliminated such that it is able to effectively to protect this grounding device.
110kV step down side neutral point FACTS grounding device provided by the invention has a characteristic that
(1) when earthing mode is adjusted by needs, only make a change in control algolithm, equivalent parameters in apparatus of the present invention can be made quickly to make corresponding change.
(2) owing to the earthing mode of apparatus of the present invention not only can be directly grounded, resistance eutral grounding, resonance grounding, switch flexibly between earth-free, the parameter adjustment of earthing mode can also be controlled flexibly by controlling the Trigger Angle of rectifier bridge, when an error occurs, resonance grounding can be adopted to reduce residual flow, quick blow-out, as fault does not eliminate, can determine whether as there is metallicity fault, low resistance grounding can be transferred to carry out failure line selection in one or two cycle, transfer earth-free mode afterwards to and maintain long charged operation, it is thus possible to ensure the maximum on-road efficiency of power system.
Claims (1)
1. a 110kV step down side neutral point FACTS grounding device, it is characterised in that: described 110kV step down side neutral point FACTS grounding device includes: spark gap B, rectifier bridge ZL, the first controllable silicon G1, the second controllable silicon G2, inductance coil L, resistor R and controller K; Wherein: one end of spark gap B is connected with step down side neutral point Y0, the other end is connected with grounding body G, rectifier bridge ZL is the full-controlled rectifier bridge being made up of four thyristors, terminal 1 thereon is connected with neutral point Y0, terminal 2 is connected with grounding body G, terminal 3 is connected with the anode of the first controllable silicon G1, terminal 4 is connected with the negative electrode of the second controllable silicon G2, the anode of the first controllable silicon G1 negative electrode and the second controllable silicon G2 connects, inductance coil L and the first controllable silicon G1 is in parallel, and resistor R and the second controllable silicon G2 is in parallel; Six outfans of controller K are connected with the control pole of four thyristors of the first controllable silicon G1, the second controllable silicon G2 and composition rectifier bridge ZL respectively, the input of controller K is connected with Substation Station control layer network, transformer station secondary system be made directly control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610203414.3A CN105655998A (en) | 2016-03-31 | 2016-03-31 | Low-voltage side neutral point FACTS (flexible alternating current transmission systems) grounding device of 110kV transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610203414.3A CN105655998A (en) | 2016-03-31 | 2016-03-31 | Low-voltage side neutral point FACTS (flexible alternating current transmission systems) grounding device of 110kV transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105655998A true CN105655998A (en) | 2016-06-08 |
Family
ID=56496037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610203414.3A Pending CN105655998A (en) | 2016-03-31 | 2016-03-31 | Low-voltage side neutral point FACTS (flexible alternating current transmission systems) grounding device of 110kV transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105655998A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202678952U (en) * | 2011-12-30 | 2013-01-16 | 洛阳恒光特种变压器有限公司 | Transformer neutral point DC current suppression device adopting series capacitor method |
| JP2014135858A (en) * | 2013-01-11 | 2014-07-24 | Toshiba Corp | Controller |
| CN204012678U (en) * | 2014-07-01 | 2014-12-10 | 广东电网公司佛山供电局 | A kind of power distribution network multimode ground protection system |
| CN204597457U (en) * | 2015-04-23 | 2015-08-26 | 许继集团有限公司 | Transformer neutral point direct current is every straight device |
| CN105391028A (en) * | 2015-11-05 | 2016-03-09 | 国网四川省电力公司电力科学研究院 | Neutral-point direct-current elimination resistance-capacitance device of transformer and method |
-
2016
- 2016-03-31 CN CN201610203414.3A patent/CN105655998A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202678952U (en) * | 2011-12-30 | 2013-01-16 | 洛阳恒光特种变压器有限公司 | Transformer neutral point DC current suppression device adopting series capacitor method |
| JP2014135858A (en) * | 2013-01-11 | 2014-07-24 | Toshiba Corp | Controller |
| CN204012678U (en) * | 2014-07-01 | 2014-12-10 | 广东电网公司佛山供电局 | A kind of power distribution network multimode ground protection system |
| CN204597457U (en) * | 2015-04-23 | 2015-08-26 | 许继集团有限公司 | Transformer neutral point direct current is every straight device |
| CN105391028A (en) * | 2015-11-05 | 2016-03-09 | 国网四川省电力公司电力科学研究院 | Neutral-point direct-current elimination resistance-capacitance device of transformer and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103066557B (en) | Modular multi-level flexible direct current system direct current fault overvoltage restraining method | |
| CN202651781U (en) | Neutral point integrated grounding complete device | |
| CN104377683A (en) | Device and method for single-phase intermittent arc grounding overvoltage protection | |
| Grebovic et al. | Influence of shunt reactor switching on overvoltages in 400 kV substation | |
| CN203180518U (en) | Intelligent switch arc-extinguishing and overvoltage-protecting device | |
| CN110492462A (en) | A kind of surge arrester with parallel gaps for the protection of 110kV transformer neutral point | |
| CN104868461A (en) | Intelligent switch arc-extinguishing and overvoltage-protecting device | |
| CN108551162A (en) | A kind of neutral grounding mode conversion equipment | |
| CN202513569U (en) | Transformer neutral point overvoltage protector | |
| CN105655998A (en) | Low-voltage side neutral point FACTS (flexible alternating current transmission systems) grounding device of 110kV transformer | |
| CN204407881U (en) | A kind of safe extinguishing arc pressure limiting device | |
| CN203826939U (en) | Electricity utilization system applied to high-voltage plant of large and medium-sized thermal power plant | |
| CN204131115U (en) | Multifunctional comprehensive circuit protection device | |
| CN208433749U (en) | A kind of transformer neutral point direct current decoupling device | |
| CN206697931U (en) | A kind of arc-extinguishing harmonic-eliminating and overvoltage protection | |
| CN207184045U (en) | For under strong thunder and lightning multiple-pulse environment and preventing the distribution box of lightning protection device catching fire | |
| CN214227829U (en) | Contact net switch ground potential counterattack suppression circuit and device | |
| CN205429872U (en) | ESD system | |
| CN205231732U (en) | Net energy -saving control system is joined in marriage to intelligence | |
| CN102332714A (en) | Grounding-free direct lightning protector for three-phase power-supply system | |
| CN112531669B (en) | Method for constructing receiving end voltage source converter station of hybrid direct current transmission system and converter station | |
| CN201234117Y (en) | Control apparatus for low-voltage isolation technique | |
| CN216086157U (en) | Transformer substation blocking type harmonic suppressor | |
| CN210327018U (en) | 10kV directly gets 12V equipment protection device | |
| CN208174259U (en) | A kind of FU self-shield D.C. magnetic biasing earthing or grounding means |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160608 |
|
| WD01 | Invention patent application deemed withdrawn after publication |