CN103138237B - Method and device used for transformer neutral point protective gap actions - Google Patents

Method and device used for transformer neutral point protective gap actions Download PDF

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Publication number
CN103138237B
CN103138237B CN201310059960.0A CN201310059960A CN103138237B CN 103138237 B CN103138237 B CN 103138237B CN 201310059960 A CN201310059960 A CN 201310059960A CN 103138237 B CN103138237 B CN 103138237B
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China
Prior art keywords
neutral point
lightning arrester
transformer neutral
protective gap
armature
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CN201310059960.0A
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CN103138237A (en
Inventor
严玉婷
王亚舟
黄炜昭
姚森敬
朱正国
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Shenzhen Power Supply Bureau Co Ltd
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Shenzhen Power Supply Bureau Co Ltd
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Abstract

The invention discloses a device used for transformer neutral point protective gap actions. The device comprises a lightening protector, a transformer neutral point protective gap connected with a lightening protector main body, a pop-up armature and a control device. The lightening protector comprises at least a lightening protector base and the lightening protector main body arranged on the lightening protector base, the pop-up armature is arranged in the transformer neutral point protective gap, and the control device is assembled on the armature and used for controlling pop-up of the armature to penetrate through and pass through the transformer neutral point protective gap according to the magnitude of current flowing through the lightening protector. The invention further discloses a method used for the transformer neutral point protective gap actions. The method and the device used for the transformer neutral point protective gap actions can reduce the probability of explosion due to the fact that the lightening protector is charged with current for too long, and ensure that a power grid is reliable to operate.

Description

A kind of method for operation of protective gap of transformer neutral point and device
Technical field
The present invention relates to field transformer, particularly relate to a kind of method for operation of protective gap of transformer neutral point and device.
Background technology
At present; 110kV ~ 500kV system adopts effective grounding mode usually; in order to limit short circuit current in single phase grounding; prevent the requirements such as configuration of adjusting of communication interference and relaying protection; the general employing direct ground connection of transformer neutral point in more than the 110kV electrical network of actual motion; the neutral point of all the other transformers through lightning arrester or portable protective gaps ground connection, or through the mode of lightning arrester and portable protective gaps earth.The protection act division of labor of lightning arrester and parallel connection gaps is: power-frequency overvoltage, switching overvoltage are born by gap; lightning overvoltage, temporary overvoltage are born by lightning arrester, limit the power-frequency overvoltage of the mistake amplitude that lightning arrester may occur and too high residual voltage again with portable protective gaps simultaneously.But many times transformer neutral point lightning arrester and gap in parallel can not actions as envisioning, and this will affect the reliability of operation of power networks.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of method for operation of protective gap of transformer neutral point and device, can reduce the probability that lightning arrester is blasted due to electrical current overlong time, ensures that electrical network is reliably runed.
In order to solve the problems of the technologies described above, embodiments provide a kind of device for operation of protective gap of transformer neutral point, comprising: lightning arrester, it at least comprises lightning arrester base and is arranged on the lightning arrester main body on lightning arrester base; The transformer neutral point protective gap be connected with lightning arrester main body; Be arranged on the armature ejected in transformer neutral point protective gap; Be installed in the control device on armature, control device, in order to the size according to lightning arrester upper reaches overcurrent, controls eject armature and puncture conducting transformer neutral point protective gap.
Preferably, control device comprises the coil be wrapped on armature, and coil is arranged in transformer neutral point protective gap.
Preferably, one end of coil is connected on lightning arrester base, other end ground connection, and the control signal of coil in order to send according to the lightning arrester base received, controls to eject armature.
Preferably, the device for operation of protective gap of transformer neutral point also comprises: in order to the resetting means resetted to it after ejecting when armature, one end of resetting means is connected on armature, and the other end is fastened and fixed.
For solving the problems of the technologies described above, the invention also discloses a kind of method for the above-mentioned operation of protective gap of transformer neutral point for operation of protective gap of transformer neutral point device, comprise the following steps: according to the size of lightning arrester upper reaches overcurrent, control to eject the armature be arranged in transformer neutral point protective gap; Puncture conducting transformer neutral point protective gap, wherein, the lightning arrester main body that transformer neutral point protective gap and a lightning arrester have is connected.
Preferably; according to the size of lightning arrester upper reaches overcurrent; the step controlling to eject the armature be arranged in transformer neutral point protective gap comprises the following steps: when the electric current on lightning arrester reaches threshold value; the lightning arrester base that lightning arrester has transmits control signal to the coil be arranged in transformer neutral point protective gap; be installed in coil on armature according to the control signal received, control to eject armature.
Preferably, the step puncturing conducting transformer neutral point protective gap comprises the following steps: transformer neutral point protective gap continues arcing to the overvoltage of lightning arrester inside and disappears, and armature resets.
Preferably, because thunder and lightning generation overvoltage and lightning arrester base, between coil transmits control signal, occur mechanical delay on lightning arrester, the overvoltage of lightning arrester inside is released by lightning arrester main body, and armature maintains static.
Preferably, mechanical delay is adjustable in the scope of 0.01 second to 1 second.
Implement method and device that the embodiment of the present invention is used for operation of protective gap of transformer neutral point, there is following beneficial effect: the size of the electric current that the lightning arrester connected by transformer neutral point flows through determines the action of armature, make protective gap of neutral point at transformer power-frequency overvoltage, the internal overvoltages such as switching overvoltage, and the power-frequency overvoltage of the mistake amplitude that lightning arrester may occur and too high residual voltage when action message, and lightning arrester action message when there is lightning overvoltage, thus ensure that lightning arrester can not be blasted due to electrical current overlong time, and then the reliability of power grid operation can be ensured.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the embodiment of the present invention for the device of operation of protective gap of transformer neutral point.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.
See Fig. 1, be used for the embodiment one of the device of operation of protective gap of transformer neutral point for the present invention.
The device for operation of protective gap of transformer neutral point in the present embodiment comprises:
Lightning arrester 1, it lightning arrester main body 12 comprising lightning arrester base 11 and be arranged on lightning arrester base 11, lightning arrester base 11 is connected on pedestal 13;
The transformer neutral point protective gap 2 be connected with lightning arrester main body 12;
Be arranged on the armature 3 ejected in transformer neutral point protective gap 2;
Be installed in the control device 4 on armature 3, control device 4, in order to the size according to lightning arrester 1 upper reaches overcurrent, controls eject armature 3 and puncture conducting transformer neutral point protective gap 2.Wherein: control device 4 at least comprises and is arranged on coil 41 in transformer neutral point protective gap 2 and resetting means 42.
Coil 41 to be wrapped on armature 3 and to be placed in transformer neutral point protective gap 2, and the effect of coil 41 produces magnetic field under the state of energising, and then applies active force and make it eject on armature 3, can action in transformer neutral point protective gap 2.
Particularly; one end 41a of coil 41 is connected on lightning arrester base 2; other end 41b ground connection; coil 41 can receive the control signal (espespecially the control signal of transformer power-frequency overvoltage, switching overvoltage) that lightning arrester base 11 sends; control to eject armature 3, and then initiation protective gap of neutral point punctures conducting.
Further, the device for operation of protective gap of transformer neutral point also comprises: in order to the resetting means 4 resetted to it after ejecting when armature 3.In the present embodiment, resetting means 4 is set to spring, and its one end is connected on armature 3, and the other end is fastened on a fixing point A.
The effect of resetting means 4 is: causing the action of above-mentioned armature 3 because of transformer power-frequency overvoltage, switching overvoltage, after transformer neutral point protective gap 2 punctures, resetting means 4 can make armature 3 reset.
During concrete enforcement, the size of current on the lightning arrester 1 that the action of armature 3 can be connected by transformer neutral point controls.Such as: when the electric current in the lightning arrester main body 12 of lightning arrester 1 reaches a certain threshold value (such as several amperes), wherein: this situation causing the electric current on lightning arrester 1 to reach a certain threshold value comprises the internal overvoltages such as transformer power-frequency overvoltage, switching overvoltage, the situation such as power-frequency overvoltage and too high residual voltage of the mistake amplitude that lightning arrester 1 may occur also is comprised.
That is, when the size of current that lightning arrester flows through reaches predetermined value, lightning arrester 1 starts, and control signal will be drawn by lightning arrester base 2, and passes to coupled coil 41; Coil 41 produces magnetic field under the state of energising, and then applying active force makes it eject on armature 3, and then initiation protective gap of neutral point punctures conducting, protection lightning arrester and other equipment.When after neutral point protection gap breakdown, lasting arcing disappears to builtin voltage by protective gap of neutral point 2, and now electric current diminishes, and resetting means 4 makes armature 3 reset.
Be understandable that, by choose different portable protective gaps 2 length or to change while the size of coil 41 and the number of turns can make armature 3 action protective gap of neutral point 2 can breakdown conducting; In addition, no matter internal overvoltage or lightning overvoltage occur, because control signal is drawn by lightning arrester base 2, first lightning arrester all can start.
Further, when transformer neutral point generation lightning overvoltage, control device can not control to eject armature 3, this is because lightning arrester main body 1 occurs there is mechanical delay between overvoltage and the indirect suspension control signal of control device 4, and when there is lightning overvoltage, due to aforementioned mechanical time delay, when control signal reaches armature 3, lightning wave is released by lightning arrester main body 12, therefore armature 3 can not be moved.
The size of the electric current that the lightning arrester 1 connected by above-mentioned transformer neutral point flows through determines the action of armature 3; make protective gap of neutral point 2 at internal overvoltages such as transformer power-frequency overvoltage, switching overvoltages; action message when power-frequency overvoltage and too high residual voltage with the mistake amplitude that lightning arrester 1 may occur; and keep motionless when there is lightning overvoltage, thus ensure that lightning arrester can not be blasted due to electrical current overlong time.
The invention also discloses a kind of method for operation of protective gap of transformer neutral point, comprise the following steps: according to the size of lightning arrester upper reaches overcurrent, control to eject the armature be arranged in transformer neutral point protective gap; Puncture conducting transformer neutral point protective gap, wherein, the lightning arrester main body that transformer neutral point protective gap and a lightning arrester have is connected.
Further; according to the size of lightning arrester upper reaches overcurrent; the step controlling to eject the armature be arranged in transformer neutral point protective gap comprises the following steps: when the electric current on lightning arrester reaches threshold value; the lightning arrester base that lightning arrester has transmits control signal to the coil be arranged in transformer neutral point protective gap; be installed in coil on armature according to the control signal received, control to eject armature.
Further, the step puncturing conducting transformer neutral point protective gap comprises the following steps: transformer neutral point protective gap continues arcing to the overvoltage of lightning arrester inside and disappears, and armature resets.
In the specific implementation, the size of current on the lightning arrester that the action of armature can be connected by transformer neutral point controls method for operation of protective gap of transformer neutral point of the present invention.Such as: when the electric current in the lightning arrester main body of lightning arrester reaches a certain threshold value (such as several amperes), wherein: this situation causing the electric current on lightning arrester to reach a certain threshold value comprises the internal overvoltages such as transformer power-frequency overvoltage, switching overvoltage, the situation such as power-frequency overvoltage and too high residual voltage of the mistake amplitude that lightning arrester may occur also is comprised.
That is, when the size of current that lightning arrester flows through reaches predetermined value, lightning arrester starts, and control signal will be drawn by lightning arrester base, and passes to coupled coil; Coil produces magnetic field under the state of energising, and then applying active force makes it eject on armature, and then initiation protective gap of neutral point punctures conducting, protection lightning arrester and other equipment.When after neutral point protection gap breakdown, lasting arcing disappears to builtin voltage by protective gap of neutral point, and now electric current diminishes, and resetting means makes armature reset.
Be understandable that, by choosing the length of different portable protective gaps or changing the breakdown conducting of protective gap of neutral point while the size of coil and the number of turns can enable armature movement; In addition, no matter internal overvoltage or lightning overvoltage occur, because control signal is drawn by lightning arrester base, first lightning arrester all can start.
Preferably, because thunder and lightning generation overvoltage and lightning arrester base, between coil transmits control signal, occur mechanical delay on lightning arrester, the overvoltage of lightning arrester inside is released by lightning arrester main body, and armature maintains static.This is because lightning arrester main body occurs there is mechanical delay between overvoltage and the indirect suspension control signal of control device, and when there is lightning overvoltage, due to aforementioned mechanical time delay, when control signal reaches armature, lightning wave is released by lightning arrester main body, therefore armature can not be moved.
Preferably, mechanical delay is adjustable in the scope of 0.01 second to 1 second.
Implement the method for operation of protective gap of transformer neutral point of the present invention and device, there is following beneficial effect, the size of the electric current that the lightning arrester connected by transformer neutral point flows through determines the action of armature, make protective gap of neutral point at transformer power-frequency overvoltage, the internal overvoltages such as switching overvoltage, and the power-frequency overvoltage of the mistake amplitude that lightning arrester may occur and too high residual voltage when action message, and lightning arrester action message when there is lightning overvoltage, thus ensure that lightning arrester can not be blasted due to electrical current overlong time, and then the reliability of power grid operation can be ensured.
Above disclosedly be only a kind of preferred embodiment of the present invention, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.

Claims (9)

1. for a device for operation of protective gap of transformer neutral point, it is characterized in that, comprising:
Lightning arrester, it at least comprises lightning arrester base and is arranged on the lightning arrester main body on described lightning arrester base;
The transformer neutral point protective gap be connected with described lightning arrester main body;
Be arranged on the armature ejected in described transformer neutral point protective gap;
Be installed in the control device on described armature, described control device, in order to the size according to described lightning arrester upper reaches overcurrent, controls eject described armature and puncture transformer neutral point protective gap described in conducting.
2., as claimed in claim 1 for the device of operation of protective gap of transformer neutral point, it is characterized in that, described control device comprises the coil be wrapped on described armature, and described coil is arranged in described transformer neutral point protective gap.
3. as claimed in claim 2 for the device of operation of protective gap of transformer neutral point; it is characterized in that; one end of described coil is connected on described lightning arrester base; other end ground connection; the control signal of described coil in order to send according to the described lightning arrester base received, controls to eject described armature.
4. the device for operation of protective gap of transformer neutral point as described in any one of claim 1-3, is characterized in that, the described device for operation of protective gap of transformer neutral point also comprises:
In order to the resetting means resetted to it after ejecting when described armature, one end of described resetting means is connected on described armature, and the other end is fastened and fixed.
5., for a method for the operation of protective gap of transformer neutral point for operation of protective gap of transformer neutral point device as described in claim 1, it is characterized in that, comprise the following steps:
According to the size of described lightning arrester upper reaches overcurrent, control to eject the armature be arranged in transformer neutral point protective gap;
Puncture transformer neutral point protective gap described in conducting, wherein, the lightning arrester main body that described transformer neutral point protective gap and a lightning arrester have is connected.
6. as claimed in claim 5 for the method for operation of protective gap of transformer neutral point; it is characterized in that; the described size according to described lightning arrester upper reaches overcurrent, the step controlling to eject the armature be arranged in transformer neutral point protective gap comprises the following steps:
When the electric current on lightning arrester reaches threshold value; the lightning arrester base that lightning arrester has transmits control signal to the coil be arranged in transformer neutral point protective gap; be installed in coil on described armature according to the described control signal received, control to eject armature.
7., as claimed in claim 5 for the method for operation of protective gap of transformer neutral point, it is characterized in that, described in puncture the step of transformer neutral point protective gap described in conducting and comprise the following steps:
Described transformer neutral point protective gap continues arcing to the overvoltage of described lightning arrester inside and disappears, and described armature resets.
8. as claimed in claim 6 for the method for operation of protective gap of transformer neutral point; it is characterized in that; because thunder and lightning generation overvoltage and described lightning arrester base, between described coil transmits control signal, occur mechanical delay on described lightning arrester; the overvoltage of described lightning arrester inside is released by described lightning arrester main body, and described armature maintains static.
9., as claimed in claim 8 for the method for operation of protective gap of transformer neutral point, it is characterized in that, described mechanical delay is adjustable in the scope of 0.01 second to 1 second.
CN201310059960.0A 2013-02-26 2013-02-26 Method and device used for transformer neutral point protective gap actions Active CN103138237B (en)

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CN201310059960.0A CN103138237B (en) 2013-02-26 2013-02-26 Method and device used for transformer neutral point protective gap actions

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CN103138237B true CN103138237B (en) 2015-05-20

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Publication number Priority date Publication date Assignee Title
CN111030049A (en) * 2019-11-19 2020-04-17 深圳供电局有限公司 Transformer neutral point protection method and device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202231431U (en) * 2011-09-14 2012-05-23 广东电网公司深圳供电局 Novel grounding structure
CN202513569U (en) * 2012-04-20 2012-10-31 安徽飞奇电气科技有限公司 Transformer neutral point overvoltage protector
CN102916421A (en) * 2012-10-22 2013-02-06 深圳供电局有限公司 Transformer protection mechanism

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5004055B2 (en) * 2008-03-12 2012-08-22 正次郎 大村 Lightning protection gap element and lightning surge protection method for lightning strike of low voltage electric circuit equipped with the element

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202231431U (en) * 2011-09-14 2012-05-23 广东电网公司深圳供电局 Novel grounding structure
CN202513569U (en) * 2012-04-20 2012-10-31 安徽飞奇电气科技有限公司 Transformer neutral point overvoltage protector
CN102916421A (en) * 2012-10-22 2013-02-06 深圳供电局有限公司 Transformer protection mechanism

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