CN206807004U - A kind of grounding transformer of wind power plant - Google Patents
A kind of grounding transformer of wind power plant Download PDFInfo
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- CN206807004U CN206807004U CN201720680276.8U CN201720680276U CN206807004U CN 206807004 U CN206807004 U CN 206807004U CN 201720680276 U CN201720680276 U CN 201720680276U CN 206807004 U CN206807004 U CN 206807004U
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- 238000004804 winding Methods 0.000 claims abstract description 48
- 230000001264 neutralization Effects 0.000 claims abstract description 32
- 230000000994 depressed Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000000116 mitigating Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000002194 synthesizing Effects 0.000 description 1
Abstract
The utility model proposes a kind of grounding transformer of wind power plant, including combining the unit integral cabinet, combination unit integral cabinet is provided with high pressure incoming end, low-voltage output, two-winding transformer is provided with combination unit integral cabinet, disconnecting switch, grounding resistance, high-pressure side neutral point zero sequence current mutual inductor, low-pressure side zero sequence current mutual inductor, two-winding transformer includes two-winding transformer high pressure winding, two-winding transformer low pressure winding, one kind is provided grounding transformer is doubled as using station local coordinate frame, pass through the grounding transformer, a station change can be saved connecting resistance is drawn by the neutral point of grounding transformer, the requirement being grounded.
Description
Technical field
It the utility model is related to grounding transformer technical field, and in particular to the grounding transformer of a kind of wind power plant and its attached
Belong to equipment.
Background technology
In power system, especially according to the transmission line of electricity transmission ＆ distribution net based on cable power supply, when single-phase earthing occurs, therefore
When barrier electric current increases to certain numerical value, arc grounding over-voltage will be produced, causes transformer or generator iron-core to burn or damage,
Harm system safety, the ground connection of usual wind power plant use single grounding transformer, draw from the main bus-bar of high voltage distribution installation and connect
One grounding transformer, its Neutral Grounding through Resistance in Electrical, installs corresponding protection element.General wind power station neutral point passes through arc blowout wire
Circle or resistance eutral grounding, grounding transformer can provide neutral point for arc suppression coil or resistance, and grounding transformer can band two
Secondary (0.4KV), so, separately installed station become, increase investment, it is not necessary that.
Utility model content
In order to solve above-mentioned technical problem, the utility model provides a kind of grounding transformer of wind power plant, and its purpose exists
In, there is provided one kind doubles as grounding transformer using station local coordinate frame, by the grounding transformer, can save a station and become,
Connecting resistance is drawn by the neutral point of grounding transformer, the requirement being grounded.
The utility model provides a kind of grounding transformer of wind power plant, including combination unit integral cabinet, the combination unit
Integral cabinet is provided with high pressure incoming end, low-voltage output；
Two-winding transformer, disconnecting switch, grounding resistance, high-pressure side neutral point zero are provided with the combination unit integral cabinet
Sequence current transformer and low-pressure side zero sequence current mutual inductor, the two-winding transformer include two-winding transformer high pressure winding and
Two-winding transformer low pressure winding；
The high voltage input terminal of the combination unit integral cabinet is connected with the high-pressure side of the two-winding transformer, the combination
The low-voltage output of device integral cabinet connects for the low-pressure side of the two-winding transformer；
The one end of the neutral point of the two-winding transformer high pressure winding through the disconnecting switch and the grounding resistance connects
Connect, the other end of the grounding resistance is connected with one end of the neutral point zero sequence current mutual inductor, the neutral point zero sequence electricity
The other end of current transformer is directly grounded；
The neutral point of the two-winding transformer low pressure winding is connected with one end of the low-pressure side zero sequence current mutual inductor,
The other end of the low-pressure side zero sequence current mutual inductor is directly grounded.
Further improved as the utility model, the high pressure incoming end is by high-tension cable successively through Current Mutual Inductance
Device, vacuum circuit breaker and high voltage bus connect.
Further improved as the utility model, the voltage of the high voltage bus is 35kV.
Further improved as the utility model, the low-voltage cable neutral earthing of the low-voltage output.
Further improved as the utility model, the output voltage of the low-voltage output is 0.4kV.
The utility model has the advantages that：Grounding transformer is doubled as using station local coordinate frame, become by the ground connection
Depressor, can save a station local coordinate frame, draw connecting resistance by the neutral point of grounding transformer, the requirement being grounded, will
The devices such as grounding transformer, grounding resistance, current transformer be arranged on one combination unit integral cabinet in, be more prone to display and
Gather service data, maintain easily, more securely and reliably, avoid split equipment install the shortcomings that.
Brief description of the drawings
Fig. 1 is the wiring schematic diagram of the grounding transformer of the wind power plant in the utility model first embodiment.
In figure, 1, high voltage bus；2nd, vacuum circuit breaker；3rd, current transformer；4th, high-tension cable；5th, combination unit synthesis
Cabinet；6th, two-winding transformer includes two-winding transformer high pressure winding；7th, disconnecting switch；8th, grounding resistance；9th, high-pressure side is neutral
Point zero sequence current mutual inductor；10th, two-winding transformer low pressure winding；11st, low-pressure side zero sequence current mutual inductor；12nd, low pressure exports
End.
Embodiment
Below in conjunction with the accompanying drawings, and specific embodiment is described in further detail to the present invention.
Embodiment 1, as shown in figure 1, a kind of grounding transformer of wind power plant, including combination unit integral cabinet 5, combination unit
Integral cabinet 5 is provided with high pressure incoming end, low-voltage output 12；
Combine the unit and two-winding transformer, disconnecting switch 7, grounding resistance 8, neutral point zero-sequence current are provided with integral cabinet 5
Transformer 9 and low-pressure side zero sequence current mutual inductor 11, two-winding transformer include two-winding transformer high pressure winding 6 and double winding
Transformer low voltage winding 10；
Disconnecting switch 7 is used for when inspection earthing equipment, opens switch, realizes that physics disconnects, equipment wiring has significantly
Cut-off point；
Combine the unit the high voltage input terminal of integral cabinet 5 and the high-pressure side of two-winding transformer connects, combine the unit integral cabinet 5
Low-voltage output 12 for two-winding transformer low-pressure side connect；
The neutral point of two-winding transformer high pressure winding 6 is connected through disconnecting switch 7 with one end of grounding resistance 8, ground connection electricity
The other end of resistance 8 is connected with one end of neutral point zero sequence current mutual inductor 9, and the other end of neutral point zero sequence current mutual inductor 9 is straight
Ground connection；
The neutral point of two-winding transformer low pressure winding 10 is connected with one end of low-pressure side zero sequence current mutual inductor 11, low pressure
The other end of side zero sequence current mutual inductor 11 is directly grounded, and the neutral ground of step down side winding is working earthing, and it is made
With the danger of the stability for being to maintain system current potential, i.e. mitigation low-pressure system overvoltage as produced by high pressure scurries into low-pressure system
Property.If any working earthing, because earth-fault current is suppressed through working earthing into loop, " drift " of voltage-to-ground.
Connecting resistance is drawn by the neutral point of transformer, the requirement being grounded, the grounded resistance 8 of neutral point of transformer connects
Ground, the generation of intermittent arc grounding overvoltage can be limited, reduce system operatio overvoltage, it is excessively electric to eliminate most of system resonance
Pressure；
High-pressure side neutral point zero sequence current mutual inductor 9 is used for the electric current that measurement stream crosses high-pressure side neutral point；
Low-pressure side zero sequence current mutual inductor 11 is used for the electric current that measurement stream crosses low-pressure side neutral point；
High pressure incoming end is connected through current transformer 3, vacuum circuit breaker 2 with high voltage bus 1 successively by high-tension cable 4.
The voltage of high voltage bus 1 is 35kV.
The low-voltage cable neutral earthing of low-voltage output 12 so that low-voltage cable neutral conductor good earth.
The output voltage of low-voltage output 12 is 0.4kV.
The utility model has the advantages that：Grounding transformer is doubled as using station local coordinate frame, become by the ground connection
Depressor, can save a station local coordinate frame, draw connecting resistance by the neutral point of grounding transformer, and the requirement being grounded can
The generation of intermittent arc grounding overvoltage is limited, system operatio overvoltage is reduced, eliminates most of system resonance overvoltage, will
The devices such as grounding transformer, grounding resistance, current transformer be arranged on one combination unit integral cabinet in, be more prone to display and
Gather service data, maintain easily, more securely and reliably, avoid split equipment install the shortcomings that.
Condition of the those skilled in the art in the spirit and scope of the present utility model for not departing from claims determination
Under, various modifications can also be carried out to above content.Therefore the scope of the utility model is not limited in saying for the above
It is bright, but determined by the scope of claims.
Claims (5)
1. a kind of grounding transformer of wind power plant, it is characterised in that including combination unit integral cabinet (5), the combination unit is comprehensive
Close cabinet (5) and be provided with high pressure incoming end, low-voltage output (12)；
It is provided with the combination unit integral cabinet (5) in two-winding transformer, disconnecting switch (7), grounding resistance (8), high-pressure side
Property point zero sequence current mutual inductor (9) and low-pressure side zero sequence current mutual inductor (11), the two-winding transformer includes double winding and becomes
Depressor high pressure winding (6) and two-winding transformer low pressure winding (10)；
The high voltage input terminal of the combination unit integral cabinet (5) is connected with the high-pressure side of the two-winding transformer, the combination
The low-voltage output (12) of device integral cabinet (5) connects for the low-pressure side of the two-winding transformer；
The neutral point of the two-winding transformer high pressure winding (6) through the disconnecting switch (7) and the grounding resistance (8) one
End connection, the other end of the grounding resistance (8) are connected with one end of the high-pressure side neutral point zero sequence current mutual inductor (9),
The other end ground connection of the neutral point zero sequence current mutual inductor (9)；
The neutral point of the two-winding transformer low pressure winding (10) and one end of the low-pressure side zero sequence current mutual inductor (11)
Connection, the other end ground connection of the low-pressure side zero sequence current mutual inductor (11).
2. grounding transformer according to claim 1, it is characterised in that the high pressure incoming end passes through high-tension cable (4)
It is connected successively through current transformer (3), vacuum circuit breaker (2) with high voltage bus (1).
3. grounding transformer according to claim 2, it is characterised in that the voltage of the high voltage bus (1) is 35kV.
4. grounding transformer according to claim 1, it is characterised in that in the low-voltage cable of the low-voltage output (12)
Property line ground connection.
5. grounding transformer according to claim 1, it is characterised in that the output voltage of the low-voltage output (12) is
0.4kV。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720680276.8U CN206807004U (en) | 2017-06-12 | 2017-06-12 | A kind of grounding transformer of wind power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720680276.8U CN206807004U (en) | 2017-06-12 | 2017-06-12 | A kind of grounding transformer of wind power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206807004U true CN206807004U (en) | 2017-12-26 |
Family
ID=60745969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720680276.8U Active CN206807004U (en) | 2017-06-12 | 2017-06-12 | A kind of grounding transformer of wind power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206807004U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110148945A (en) * | 2019-05-15 | 2019-08-20 | 全球能源互联网研究院有限公司 | A kind of ground connection isolating device based on low frequency power transmission system |
| WO2021004479A1 (en) * | 2019-07-10 | 2021-01-14 | 国网浙江省电力有限公司台州供电公司 | Variable-frequency power transmission system |
-
2017
- 2017-06-12 CN CN201720680276.8U patent/CN206807004U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110148945A (en) * | 2019-05-15 | 2019-08-20 | 全球能源互联网研究院有限公司 | A kind of ground connection isolating device based on low frequency power transmission system |
| CN110148945B (en) * | 2019-05-15 | 2020-09-29 | 全球能源互联网研究院有限公司 | Grounding isolation device based on low-frequency power transmission system |
| WO2021004479A1 (en) * | 2019-07-10 | 2021-01-14 | 国网浙江省电力有限公司台州供电公司 | Variable-frequency power transmission system |
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