CN202978223U - Mechanism for controlling action of transformer neutral point gap - Google Patents
Mechanism for controlling action of transformer neutral point gap Download PDFInfo
- Publication number
- CN202978223U CN202978223U CN 201220648696 CN201220648696U CN202978223U CN 202978223 U CN202978223 U CN 202978223U CN 201220648696 CN201220648696 CN 201220648696 CN 201220648696 U CN201220648696 U CN 201220648696U CN 202978223 U CN202978223 U CN 202978223U
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- China
- Prior art keywords
- gap
- action
- neutral point
- barrier
- transformer neutral
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Abstract
The utility model discloses a mechanism for controlling the action of the transformer neutral point gap. The mechanism comprises a transformer neutral point protective gap, and a removable barrier which is arranged in the protective gap. The action of the barrier is determined by the current flowing through a lightning arrester which is connected with the transformer neutral point. The control unit is used to determine the action of the barrier according to the current flowing through the lightning arrester which is connected with the transformer neutral point, and make the barrier move out from the gap when the current reaches the threshold value. In the lightning overvoltage condition, the lightning waves are discharged at first due to mechanical delay so as to ensure that the barrier will not undergo movement action. The mechanism for controlling the action of the transformer neutral point gap disclosed in the utility model can be used to ensure that the lightning arrester is in action in the transformer lightning overvoltage condition and the gap is in action in the internal overvoltage condition, so that the lightning arrester will not be exploded due to excessive current flowing-through time.
Description
Technical field
The utility model relates to transformer and controls the protection field, relates in particular to the mechanism of a kind of control transformer neutral point gap action.
Background technology
At present; 110kV～500kV system adopts the effective grounding mode usually; in order to limit the single-line to ground fault electric current; prevent the requirements such as the configuration of adjusting of communication interference and relaying protection; direct ground connection of transformer neutral point of general employing in the above electrical network of the 110kV of actual motion; the neutral point of all the other transformers is through lightning arrester or protect gap ground connection, or through lightning arrester and the mode of protecting the gap earth.The protection action division of labor of lightning arrester and parallel connection gaps is: power-frequency overvoltage, switching overvoltage are born by the gap; lightning overvoltage, temporary overvoltage are born by lightning arrester, simultaneously limit the power-frequency overvoltage of the too high amplitude that may occur on lightning arrester and too high residual voltage with the protection gap again.Yet many times the transformer neutral point lightning arrester can not move as anticipation with gap in parallel, and this will affect the reliability of operation of power networks.
Summary of the invention
Technical problem to be solved in the utility model is, in view of neutral point when the lightning arrester parallel connection gaps ground connection, both cooperations are very difficult, the utility model proposes the mechanism of a kind of control transformer neutral point gap action, guarantee that lightning arrester can be owing to blasting by current time is long.
For solving the problems of the technologies described above, the utility model adopts following technical scheme:
The mechanism of a kind of control transformer neutral point gap action; comprise transformer neutral point protection gap; and the movably barrier that arranges in protecting the gap, the size of current that flows through on the lightning arrester of the action of described barrier by described transformer neutral point connection determines.
Further, also comprise:
Control unit, an end is connected to the base of described lightning arrester, and the other end is connected to described barrier, is used for receiving the control signal of sending from described base, to control the action of described barrier;
Reset unit, first end and the second end are connected respectively to described protection gap and barrier, and the 3rd end ground connection is used for controlling described barrier and resetting after described barrier is moved action.
Further; when the voltage on described lightning arrester or electric current surpass threshold value; described control unit is controlled described barrier and is shifted out from described protection gap; the conducting of described protection gap breakdown; described control unit automatically resets and closes; described protection gap continues arcing to internal overvoltage and disappears, and described reset unit is controlled described barrier and resetted.
Further, occuring there is mechanical delay between overvoltage and described control unit reception control signal on described lightning arrester, lightning overvoltage occurs on described lightning arrester, described mechanical delay is when making described control signal arrive described control unit, lightning wave is first released by lightning arrester, guarantees the action that is not moved of described barrier.
Further, described barrier is made of insulation class material.
Further, described insulation class material is polytetrafluoroethylene.
The mechanism of the control transformer neutral point gap action that the utility model embodiment provides, guarantee transformer lightning arrestor movement when lightning overvoltage, and gap action during internal overvoltage, thereby guarantee that lightning arrester can be owing to blasting by current time is long.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structure principle chart of the mechanism of a kind of control transformer neutral point gap action that provides of the utility model.
Embodiment
Below with reference to accompanying drawing, preferred embodiment of the present utility model is described.
Fig. 1 is the structure principle chart of the mechanism of a kind of control transformer neutral point gap action that provides of the utility model.As shown in Figure 1, the mechanism of a kind of control transformer neutral point gap action that the utility model provides, comprising: transformer neutral point is protected gap 5, protects at this movably barrier 4, control unit 6 and reset unit 7 that arranges in gap 5.Control unit 6 one ends are connected to lightning arrester base 2, and the other end is connected to barrier 4, draw control signal from base 2, to control the action of institute's barrier 4.The first end of reset unit 7 and the second end are connected respectively to protection gap 5 and barrier 4, the three end ground connection, are used for after barrier 4 is moved action, control barrier 4 and reset.The size of current that flows through on the lightning arrester of the action of barrier 4 by the transformer neutral point connection determines.Lightning arrester comprises main body 1, base 2 and basis 3.
During specific works, control signal is drawn from the base 2 of lightning arrester, and when the electric current that flows through lightning arrester main body 1 reached threshold value (for example several amperes), control unit 6 was controlled barrier 4 actions.By choosing the protection length in gap 5 and the material of barrier 4, can make when internal overvoltage occurs the protection breakdown conducting in gap 5 when barrier 4 is removed, protection lightning arrester and main equipment.After protecting gap 5 to puncture, control unit 6 automatically resets and closes, and protects gap 5 will continue arcing to internal overvoltage and disappears, and this moment, electric current diminished, and reset unit 7 is controlled barriers 4 and resetted.Because control signal is to draw from the base 2 of lightning arrester main body 1, no matter internal overvoltage or lightning overvoltage occur, at first lightning arrester all starts.
In the present embodiment, occuring there is mechanical delay between overvoltage and control unit 6 reception control signals on lightning arrester main body 1, it is adjustable in the scope of 0.02 second to 1 second.When lightning overvoltage occured, due to aforementioned mechanical delay, when control signal arrived control unit 6, lightning wave was first released by lightning arrester main body 1, therefore barrier 4 can guarantee the action that is not moved.By above steps flow chart, make the protection gap 5 can action message when internal overvoltage, and keep motionless during lightning overvoltage.
The mechanism of the control transformer neutral point gap action that the utility model embodiment provides, guarantee transformer lightning arrestor movement when lightning overvoltage, and gap action during internal overvoltage, thereby guarantee that lightning arrester can be owing to blasting by current time is long.
Above disclosed is only preferred embodiment of the present invention, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Claims (7)
1. the mechanism of a control transformer neutral point gap action; it is characterized in that; comprise transformer neutral point protection gap, and the movably barrier that arranges in the protection gap, the size of current that flows through on the lightning arrester that the action of described barrier is connected by described transformer neutral point determines.
2. the mechanism of control transformer neutral point gap action according to claim 1, is characterized in that, also comprises:
Control unit, an end is connected to the base of described lightning arrester, and the other end is connected to described barrier, is used for receiving the control signal of sending from described base, to control the action of described barrier;
Reset unit, first end and the second end are connected respectively to described protection gap and barrier, and the 3rd end ground connection is used for controlling described barrier and resetting after described barrier is moved action.
3. the mechanism of control transformer neutral point according to claim 2 gap action; it is characterized in that; when the voltage on described lightning arrester or electric current surpass threshold value; described control unit is controlled described barrier and is shifted out from described protection gap; the conducting of described protection gap breakdown; described control unit automatically resets and closes, and lasting arcing to the internal overvoltage in described protection gap disappears, and described reset unit is controlled described barrier and resetted.
4. the mechanism of control transformer neutral point according to claim 3 gap action, it is characterized in that, occuring there is mechanical delay between overvoltage and described control unit reception control signal on described lightning arrester, lightning overvoltage occurs on described lightning arrester, described mechanical delay is when making described control signal arrive described control unit, lightning wave is first released by lightning arrester, guarantees the action that is not moved of described barrier.
5. the mechanism of control transformer neutral point gap action according to claim 4, is characterized in that, described mechanical delay is adjustable in the scope of 0.02 second to 1 second.
6. the mechanism of control transformer neutral point gap action according to claim 1, is characterized in that, described barrier is made of insulation class material.
7. the mechanism of control transformer neutral point gap action according to claim 6, is characterized in that, described insulation class material is polytetrafluoroethylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220648696 CN202978223U (en) | 2012-11-30 | 2012-11-30 | Mechanism for controlling action of transformer neutral point gap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220648696 CN202978223U (en) | 2012-11-30 | 2012-11-30 | Mechanism for controlling action of transformer neutral point gap |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202978223U true CN202978223U (en) | 2013-06-05 |
Family
ID=48519250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220648696 Expired - Lifetime CN202978223U (en) | 2012-11-30 | 2012-11-30 | Mechanism for controlling action of transformer neutral point gap |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202978223U (en) |
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2012
- 2012-11-30 CN CN 201220648696 patent/CN202978223U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130605 |