CN204290298U - A kind of power transformer neutral point direct current current limliting and every stream device - Google Patents
A kind of power transformer neutral point direct current current limliting and every stream device Download PDFInfo
- Publication number
- CN204290298U CN204290298U CN201520003609.4U CN201520003609U CN204290298U CN 204290298 U CN204290298 U CN 204290298U CN 201520003609 U CN201520003609 U CN 201520003609U CN 204290298 U CN204290298 U CN 204290298U
- Authority
- CN
- China
- Prior art keywords
- current
- stream device
- direct current
- neutral point
- limiting
- 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.)
- Active
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model provide a kind of power transformer neutral point direct current current limliting and every stream device.Include transformer body, the neutral point of transformer body is directly connected with a ground side current monitoring system, and the neutral point of transformer body is also parallel with three by-pass switches simultaneously; One of them by-pass switch is parallel with resistance-type current-limiting apparatus and reactance every stream device, and another two by-pass switches are connected into a condenser type jointly every stream device; Described resistance-type current-limiting apparatus, reactance connect an alternating current-direct current CT group every stream device, condenser type jointly every stream device, and alternating current-direct current CT group is connected with D.C. magnetic biasing on-line monitoring system.The utility model apparatus structure is simple, easy for installation, can be used for direct current current-limiting on transformer neutral point, dual-purpose every stream, and can realize direct current current-limiting with every the freely safety turn flow.
Description
Technical field
The utility model belongs to electric equipment transmission line technical field, refer more particularly to a kind of power transformer neutral point direct current current limliting and every stream device.
Background technology
Now, China's superhigh pressure, extra-high voltage direct-current transmission technology obtain broad development and reach the leading level in the world.Along with putting into operation of China's DC power transmission line, the situation that electrical network alternating current-direct current coexists is formed, thus has also derived new problem.
In the actual moving process of electrical network, direct current system inevitably produces a powerful current field at periphery, due to ground resistivity change, and transformer generally adopts neutral-point solid ground, cause the current potential of the neutral point of the transformer of diverse location different, thus make to go in the lower Transformer Winding of the earth current of grounded part inflow current potential, clicking and entering ground through alternating current circuit by neutrality, form a DC loop.Thus cause transformer core saturated, there is transformer DC magnetic bias, produce high order harmonic component, harm power system security.
The harm brought for preventing D.C. magnetic biasing, common technique is increase direct current current-limiting device at transformer neutral point ground connection place to make it limit the generation of high order harmonic component now.But the method is more inflexible, the intelligence of electric power system now, controlled requirement can not be adapted to.
Summary of the invention
Technical problem to be solved in the utility model is the deficiency for above-mentioned existence, there is provided a kind of structure simple, easy for installation, can be used for direct current current-limiting on transformer neutral point, dual-purpose every stream, and can realize direct current current-limiting with every the safe power transformer neutral point direct current current limliting changed of the freedom that flow and every flowing device.
The utility model solves the technical scheme that its technical problem adopts:
A kind of power transformer neutral point direct current current limliting and every stream device, include transformer body, it is characterized in that: the neutral point of described transformer body is directly connected with a ground side current monitoring system, the neutral point of transformer body is also parallel with three by-pass switches simultaneously; One of them by-pass switch is parallel with resistance-type current-limiting apparatus and reactance every stream device, and another two by-pass switches are connected into a condenser type jointly every stream device; Described resistance-type current-limiting apparatus, reactance connect an alternating current-direct current CT group every stream device, condenser type jointly every stream device, and alternating current-direct current CT group is connected with D.C. magnetic biasing on-line monitoring system.
In such scheme, described resistance-type current-limiting apparatus, reactance are all provided with a switch every stream device, condenser type every stream device on respective circuit, and it is respectively current-limiting resistance line switching, every flowing reactor line switching, electric capacity every Flow Line switch.
In such scheme, described alternating current-direct current CT group includes one and exchanges CT group and two direct current CT groups.
Principle of the present utility model is, original device basic adds every stream and current-limiting apparatus, transformer group neutral ground side joint is entered the utility model access side, and in parallel with earthing device, by to the control of each switch and adjustment, realize direct current current-limiting and change every freedom flow is safe.
The beneficial effects of the utility model are:
The utility model apparatus structure is simple, easy for installation, can be used for direct current current-limiting on transformer neutral point, dual-purpose every stream, and can realize direct current current-limiting and change every freedom flow is safe.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment;
In figure: 1 is transformer body; 2 is ground side current monitoring system; 3 is that condenser type is every stream device; 4 is resistance-type current-limiting apparatus; 5 is that reactance is every stream device; 6 is D.C. magnetic biasing on-line monitoring system; 7 is alternating current-direct current CT group; 8 is by-pass switch; 9 is that electric capacity is every Flow Line switch; 10 is current-limiting resistance line switching; 11 is every stream reactor line switching.
Embodiment
Below in conjunction with embodiment, the utility model is further described:
As shown in Figure 1 power transformer neutral point direct current current limliting and every stream device, include transformer body 1, the neutral point of described transformer body 1 is directly connected with a ground side current monitoring system 2, and the neutral point of transformer body 1 is also parallel with three by-pass switches 8 simultaneously; One of them by-pass switch is parallel with resistance-type current-limiting apparatus 4 and reactance every stream device 5, and another two by-pass switches are connected into a condenser type jointly every stream device 3; Described resistance-type current-limiting apparatus 4, reactance jointly connect alternating current-direct current CT group 7, an alternating current-direct current CT group 7 every stream device 3 be connected with D.C. magnetic biasing on-line monitoring system 6 every stream device 5, condenser types.
In the present embodiment, described resistance-type current-limiting apparatus 4, reactance are all provided with a switch every stream device 5, condenser type every stream device 3 on respective circuit, and it is respectively current-limiting resistance line switching 10, every flowing reactor line switching 11, electric capacity every Flow Line switch 9.
In the present embodiment, described alternating current-direct current CT group 7 includes one and exchanges CT group and two direct current CT groups.
When the direct ground connection of needs transformer body 1, cut-off by-pass switch 8, closed transformer grounding line switching.
By controlling current-limiting resistance line switching 10, controlling the operational mode of the utility model current limliting or stopping direct current every stream reactor line switching 11, electric capacity every the contactor of Flow Line switch 9.
When ground wire on-line monitoring system monitor high-frequency current by time, cut-off electric capacity every Flow Line switch 9, closed every stream reactor line switching 11.
When ground wire on-line monitoring system monitor low-frequency current by time, cut-off every stream reactor line switching 11, closed electric capacity is every Flow Line switch 9.When system single-phase short circuit, if capacitor voltage at both ends is more than a threshold value, the action of current bypass protective device, reduces the temporary overvoltage at electric capacity two ends, and provides path for zero-sequence current, reduces the capacity of electric capacity as far as possible.
When needs carry out ground wire direct current current-limiting, closed current-limiting resistance line switching 10, cut-offs every stream reactor line switching 11, electric capacity every Flow Line switch 9.Now, other transformer neutral point direct currents of annex may be caused to exceed standard, therefore, all will be no more than with the DC quantity of the transformer of whole target grid and bear limit for limiting value.When therefore using this programme, needing to consider every possible angle the whole network, having reached when not affecting the D.C. magnetic biasing of other transformers, reduce self direct current excess transformer DC magnetic bias problem.
When this device works, by-pass switch cut-offs, and makes capacitor access transformer neutral point, plays the state suppressing direct current inflow transformer neutral point.When neutral point of main transformer direct current has exceeded setting limit value, device should have been transferred to every straight operating state by direct ground state.
When device is operated in every straight operating state, once there is any one situation following, device will transfer direct ground state to immediately:
1) neutral point of main transformer alternating current exceedes setting limit value;
2) capacitor two ends direct voltage is lower than setting limit value;
3) measured value being installed in two direct current CT of neutral point of main transformer exceedes setting limit value.
The utility model service condition is as follows:
---height above sea level :≤1000 m.
---the highest ambient air temperature :+40 DEG C.
---minimum ambient air temperature: – 25 DEG C.
---maximum temperature difference per day: 25 K.
---average temperature of the whole year: 20 DEG C.
---maximum relative humidity: be 90% at 25 DEG C.
---maximum wind velocity: 35 m/s(are 10m high 10 minutes mean wind speeds overhead).
---ice covering thickness: 10 mm.
---intensity of sunshine :≤0.1W/cm
2(wind speed 0.5 m/s).
---gradation for surface pollution: III grade.
---shatter-proof ability (seismic wave is sinusoidal wave, duration three cycles, coefficient of safety 1.67):
A) ground horizontal acceleration: 2.5 m/ s
2.
B) ground normal acceleration: 1.25 m/ s
2.
More than illustrate and be only Application Example of the present utility model, certainly can not limit the interest field of the utility model with this, therefore according to the equivalence change that the utility model claim is done, still belong to protection range of the present utility model.
Claims (3)
1. a power transformer neutral point direct current current limliting and every stream device, include transformer body, it is characterized in that: the neutral point of described transformer body is directly connected with a ground side current monitoring system, the neutral point of transformer body is also parallel with three by-pass switches simultaneously; One of them by-pass switch is parallel with resistance-type current-limiting apparatus and reactance every stream device, and another two by-pass switches are connected into a condenser type jointly every stream device; Described resistance-type current-limiting apparatus, reactance connect an alternating current-direct current CT group every stream device, condenser type jointly every stream device, and alternating current-direct current CT group is connected with D.C. magnetic biasing on-line monitoring system.
2. power transformer neutral point direct current current limliting as claimed in claim 1 and every stream device, it is characterized in that: described resistance-type current-limiting apparatus, reactance are all provided with a switch every stream device, condenser type every stream device on respective circuit, it is respectively current-limiting resistance line switching, every flowing reactor line switching, electric capacity every Flow Line switch.
3. power transformer neutral point direct current current limliting as claimed in claim 1 and every stream device, is characterized in that: described alternating current-direct current CT group includes one and exchanges CT group and two direct current CT groups.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520003609.4U CN204290298U (en) | 2015-01-06 | 2015-01-06 | A kind of power transformer neutral point direct current current limliting and every stream device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520003609.4U CN204290298U (en) | 2015-01-06 | 2015-01-06 | A kind of power transformer neutral point direct current current limliting and every stream device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204290298U true CN204290298U (en) | 2015-04-22 |
Family
ID=52873428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520003609.4U Active CN204290298U (en) | 2015-01-06 | 2015-01-06 | A kind of power transformer neutral point direct current current limliting and every stream device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204290298U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105186473A (en) * | 2015-05-29 | 2015-12-23 | 广西电网有限责任公司电力科学研究院 | DC magnetic bias current suppression device for transformer high-voltage winding |
| CN107068365A (en) * | 2016-09-29 | 2017-08-18 | 国家电网公司 | A kind of method of built-in transformer current-limiting apparatus and limiting transformer short circuit |
-
2015
- 2015-01-06 CN CN201520003609.4U patent/CN204290298U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105186473A (en) * | 2015-05-29 | 2015-12-23 | 广西电网有限责任公司电力科学研究院 | DC magnetic bias current suppression device for transformer high-voltage winding |
| CN105186473B (en) * | 2015-05-29 | 2018-03-16 | 广西电网有限责任公司电力科学研究院 | A kind of restraining device of DC magnetic bias current for transformer high-voltage winding |
| CN107068365A (en) * | 2016-09-29 | 2017-08-18 | 国家电网公司 | A kind of method of built-in transformer current-limiting apparatus and limiting transformer short circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20200083702A1 (en) | Safe processing method for active voltage reduction of ground fault phase of non-effective ground system | |
| Jia et al. | Transient high-frequency impedance comparison-based protection for flexible DC distribution systems | |
| CN103514320B (en) | A kind of emulation mode of multi-feed HVDC area transformer DC magnetic bias | |
| CN103474974B (en) | A kind of distribution network single-phase ground protection method based on zero-sequence current Sudden Changing Rate fitting a straight line direction | |
| CN103364692A (en) | Single-phase earth fault line selection method of power distribution network earthing system | |
| CN107332211B (en) | A kind of capacitance-resistance type transformer DC magnetic bias inhibition device | |
| CN103368168B (en) | The transformer DC magnetic bias restraining device of automatic switching and control method thereof | |
| CN101710697A (en) | Device and method for inhibiting direct current of neutral point of transformer | |
| CN108303614A (en) | A kind of 10kV cable systems low current neutral grounding system fault positioning system and method | |
| CN104638635B (en) | Power network neutral point active pull-up earthing method | |
| CN204290298U (en) | A kind of power transformer neutral point direct current current limliting and every stream device | |
| CN103592569B (en) | A kind of extra-high-voltage direct-current transmission line fault location based on high frequency content attenuation characteristic | |
| CN106443334B (en) | A kind of distribution network fault line selection method based on zero-sequence current difference Polarity comparision | |
| CN105048435B (en) | A kind of transformer DC magnetic bias current restraining device and control method | |
| CN110261723A (en) | A kind of small current earthing wire-selecting method based on the coefficient of variation and Higher Order Cumulants | |
| Dhakulkar et al. | Inspection of voltage sags and voltage swells incident in power quality problems-a review | |
| CN105738751A (en) | Setting calculation method for bus differential protection current loop line disconnection alarm fixed value | |
| CN104953565B (en) | Line interphase fault relay protection method is surveyed based on transition resistance | |
| CN103337821A (en) | Overvoltage protection and insulation coordination design method of direct current ice melting system | |
| CN104749453A (en) | Method for reducing influences imposed on user voltage sag by external grid single-phase grounding fault | |
| CN203883464U (en) | Controllable small-resistor arc-extinguishing device | |
| CN104849616B (en) | Based on virtual power comparison principle distribution fault line selection method for single-phase-to-ground fault | |
| CN103490384B (en) | Multi-generator ship intermediate voltage electric power system protection method and device | |
| CN207490507U (en) | A kind of transformer DC magnetic bias restraining device and voltage transformer system | |
| Rong et al. | A novel topology for grounding fault voltage compensation based on voltage clamping |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100000 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee after: MAINTENANCE COMPANY, STATE GRID XINJIANG ELECTRIC POWER Co. Patentee after: State Grid Corporation of China Co-patentee after: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Address before: 100000 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee before: Maintenance Company Of State Grid Xinjiang Electric Power Co.,Ltd. Patentee before: State Grid Corporation of China Co-patentee before: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute |
|
| CP01 | Change in the name or title of a patent holder | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190918 Address after: 830001 No. 123, Jianshe Road, Tianshan District, the Xinjiang Uygur Autonomous Region, Urumqi Co-patentee after: State Grid Corporation of China Patentee after: MAINTENANCE COMPANY, STATE GRID XINJIANG ELECTRIC POWER Co. Address before: 100000 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee before: MAINTENANCE COMPANY, STATE GRID XINJIANG ELECTRIC POWER Co. Patentee before: State Grid Corporation of China Co-patentee before: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute |
|
| TR01 | Transfer of patent right |