CN108683165A - Controllable portable protective gaps and its application process under a kind of high current - Google Patents
Controllable portable protective gaps and its application process under a kind of high current Download PDFInfo
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- CN108683165A CN108683165A CN201810514818.3A CN201810514818A CN108683165A CN 108683165 A CN108683165 A CN 108683165A CN 201810514818 A CN201810514818 A CN 201810514818A CN 108683165 A CN108683165 A CN 108683165A
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- current
- hemisphere face
- control unit
- gap
- measurement
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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Generation Of Surge Voltage And Current (AREA)
Abstract
The invention discloses controllable portable protective gaps and its application processes under a kind of high current, controllable portable protective gaps include gap component under high current, pulse generating unit, current transformer and measurement and control unit, gap component is made of two hemisphere face electrodes, two hemisphere face electrodes form protection main gap, and the spherical surface of wherein at least one hemisphere face electrode is equipped with the spark point towards another hemisphere face electrode arrangement and connection conducting, the output end of pulse generating unit connect conducting with spark point, two hemisphere face electrodes are connected in parallel on the both ends of protected high-voltage electrical equipment, current transformer is arranged on the current loop of protected high-voltage electrical equipment, and the output end of current transformer is connected with measurement and control unit, the output end of measurement and control unit is connected with the control terminal of pulse generating unit.The configuration of the present invention is simple is reliable, can realize and provide Low ESR electrical equipment high reliability, the controlled discharge gap protection function without controlling dead error when bearing high current.
Description
Technical field
The present invention relates to electrical engineering technologies, and in particular to controllable portable protective gaps and its application process under a kind of high current,
Controllable bypass protection when failure high current is born for Low ESR electrical equipment.
Background technology
Some Low ESR electrical equipments in power grid, such as transformer neutral point capacitance or resistor, in distribution line
Series compensation capacitance etc., the operating current voltage that equipment is subjected to when normal operation is all relatively low, when the grid collapses,
Such as line-to-ground fault or short trouble, electrical equipment is subjected to prodigious system failure electric current, may be up to tens thousand of amperes.For
Guarantee electrical equipment safety, it will usually in its both ends bypass protection ball discharge gap in parallel, this fixed ball gap spacing root
According to be calculated by the Insulation Coordination of protection equipment, the overvoltage protection level in gap is determined after determination.This
Kind fixes the major defect that sphere gap is protected：Ball-gap discharge large dispersion, breakdown voltage is with environment temperature, air pressure, humidity
Variation and change, protection feature is unstable.Another aspect design impedance is small, and impedance value is between several to several ohms of zero, greatly
Power-frequency overvoltage amplitude is not high under electric current, and sphere gap adjustment can not be often adjusted in many cases apart from limited and cannot be too small
To suitable sphere gap.It is influenced by above two reason, when simple fixed ball gap makees Low ESR electrical equipment and bears failure high current
Bypass protection measure, realize protection cooperation parameter determine it is more difficult, practical application effect is bad.
Invention content
The technical problem to be solved in the present invention：For existing high voltage electric equipment（Especially to Low ESR electrical equipment）It protects
In shield common fixed interval (FI) protected mode there are ball-gap discharge large dispersion, protection feature is unstable, sphere gap adjustment is difficult
The deficiencies of, propose controllable portable protective gaps and its application process under a kind of high current, the configuration of the present invention is simple is reliable, can realize pair
Low ESR electrical equipment provides high reliability, the controlled discharge gap protection function without controlling dead error when bearing high current.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
The present invention provides controllable portable protective gaps under a kind of high current, including gap component, pulse generating unit, current transformer and
Measurement and control unit, the gap component is made of two hemisphere face electrodes that gap is arranged, and the spherical surface phase of two hemisphere face electrodes
Protection main gap is formed to arrangement, and the spherical surface of wherein at least one hemisphere face electrode is equipped with towards another hemisphere face electrode
The spark point that arrangement and connection are connected, the output end of the pulse generating unit connect conducting, two hemisphere with spark point
Face electrode is connected in parallel on the both ends of protected high-voltage electrical equipment, and the current transformer is arranged in protected High-Voltage Electrical Appliances and sets
On standby current loop, and the output end of the current transformer is connected with measurement and control unit, the output end of the measurement and control unit with
The control terminal of pulse generating unit is connected.
Preferably, a hemisphere face electrode in described two hemisphere face electrodes is fixed between adjusting protection master
Coordinate on the screw rod of gap width and with screw flight, the screw rod is arranged along the width direction of protection main gap.
Preferably, the pulse generating unit includes rectifier bridge, charging capacitor, IGBT module and high-frequency pulse transformer,
The input terminal of the rectifier bridge is connected with external power supply, and the charging capacitor is arranged in parallel at the output end of rectifier bridge, described whole
The output end of bridge, IGBT module, the primary side of high-frequency pulse transformer is flowed to join end to end successively forming circuit, the measurement and control unit
Output end is connected with the control terminal of IGBT module, secondary side one end ground connection, the other end and the spark electricity of the high-frequency pulse transformer
Pole connection conducting.
The present invention provides a kind of application process of controllable portable protective gaps under high current above-mentioned, and implementation steps include：
1）The measurement and control unit detects the electric current of protected high-voltage electrical equipment by current transformer；
2）The measurement and control unit judges whether electric current is more than preset protection definite value, if it exceeds protection definite value then redirects and executes step
Rapid 3）；Otherwise, it redirects and executes step 1）；
3）The measurement and control unit generates continuous multiple current impulses by pulse generating unit so that spark point and hemisphere face electricity
Spark discharge is generated between pole, causes to protect main gap electric field distortion after spark discharge generation, causes to protect main gap insulation
It is resistant to strength reduction, protection main gap is enabled to generate penetrability electric discharge under operating voltage effect, to exempt from electrical equipment bypass
By heavy current impact.
Compared to the prior art, present invention produces following advantageous effects：
1, compared with fixed ball gap protection, the present invention has very high the degree of automation, expands ball gap protection equipment range, energy
Enough excess current protective functions realized to Low ESR electrical equipment；
2, the present invention has automatic decision overcurrent function, and the current protection definite value of measurement and control unit can join according to electrical equipment
Number, and live possible breakdown current amplitude are adjusted setting, improve controllable portable protective gaps application flexibility；
3, the present invention uses continuous multiple-pulse triggering mode, it is ensured that can trigger and put in the higher instantaneous value of main gap operating voltage
Electricity, escaping can control ball " controlling dead error " existing for gap, be capable of providing ball gap protection act reliability.
4, the configuration of the present invention is simple, design method is highly practical, is verified in engineering, and facts have proved this
The control gap of principle has very high triggering discharge reliability.
Description of the drawings
Fig. 1 is the structural schematic diagram of equipment of the embodiment of the present invention.
Fig. 2 is the electrical principle structural schematic diagram of equipment of the embodiment of the present invention.
Marginal data：1, gap component；11, hemisphere face electrode；12, spark point；13, screw rod；2, pulse generating unit；
21, rectifier bridge；22, charging capacitor；23, IGBT module；24, high-frequency pulse transformer；3, current transformer；4, measurement and control unit.
Specific implementation mode
Hereafter using for protect high-power transformer neutral point block capacitor as protected high-voltage electrical equipment
Example, controllable portable protective gaps and its application process under high current of the present invention are described in further detail, the blocking electricity
The impedance of container is about 0.1 Ω.
As shown in Figure 1, under the high current of the present embodiment controllable portable protective gaps include gap component 1, pulse generating unit 2,
Current transformer 3 and measurement and control unit 4, gap component 1 is made of two hemisphere face electrodes 11 that gap is arranged, and two hemisphere faces
Main gap is protected in the spherical surface formation positioned opposite of electrode 11, and the spherical surface of wherein at least one hemisphere face electrode 11 is equipped with direction
Another hemisphere face electrode 11 is arranged and the spark point 12 of connection conducting, the output end and spark point of pulse generating unit 2
12 connection conductings, two hemisphere face electrodes 11 are connected in parallel on protected high-voltage electrical equipment（Block capacitor）Both ends, electric current
Mutual inductor 3 is arranged in protected high-voltage electrical equipment（Block capacitor）Current loop on, and the output of current transformer 3
End is connected with measurement and control unit 4, and the output end of measurement and control unit 4 is connected with the control terminal of pulse generating unit 2.The prior art it is controllable
The principle of ball gap action is to realize main gap more than tolerance intensity of the main gap under spark discharge effect by operating voltage
Electric discharge, therefore electric discharge can only occur near power-frequency voltage peak value, and phase sends out trigger pulse near power frequency zero passage, between main
Gap operating voltage instantaneous value is very low, is not enough to lead to the electric discharge of main gap；It can control ball " controlling dead error " existing for gap to escape, this
The measurement and control unit 4 of embodiment is by generating continuous multiple triggering firing pulses, until protection main gap occurs through electric discharge, in quilt
Measurement and control unit is automatically stopped triggering after protection device current reduces.
In the present embodiment, two hemisphere face electrodes 11 are using the graphite of arc ablation resistance as electrode material.
In the present embodiment, 11 center of hemisphere face electrode that gap component 1 is grounded one end processes circular hole, interior placement spark electricity
Pole 12, there are close gaps as spark-discharge gap between spark point 12 and hemisphere face electrode 11.
As shown in Figure 1, a hemisphere face electrode 11 in two hemisphere face electrodes 11 is fixed on for adjusting protection
On the screw rod 13 of main gap width and with 13 screw-thread fit of screw rod, screw rod 13 along protection main gap width direction arrange.This
In embodiment, the clearance distance of main gap is protected to be adjusted to 3mm, can tolerate 5kV（Peak value）Voltage.
Become as shown in Fig. 2, pulse generating unit 2 includes rectifier bridge 21, charging capacitor 22, IGBT module 23 and high-frequency impulse
The input terminal of depressor 24, rectifier bridge 21 is connected with external power supply, and charging capacitor 22 is arranged in parallel at the output end of rectifier bridge 21, whole
It flows the output end of bridge 21, IGBT module 23, the primary side of high-frequency pulse transformer 24 to join end to end successively forming circuit, measurement and control unit
4 output end is connected with the control terminal of IGBT module 23, secondary side one end ground connection, the other end and the spark of high-frequency pulse transformer 24
The connection conducting of electrode 12, rectifier bridge 21 regard AC power rectification as working power to the charging of charging capacitor 22, pass through control
IGBT module 23 sends out trigger pulse, and high-voltage pulse can be produced through high-frequency pulse transformer 24 so that spark point 12 generates
Spark discharge.
The present embodiment provides a kind of application process of controllable portable protective gaps under high current above-mentioned, implementation steps include：
1）Measurement and control unit 4 detects the electric current of protected high-voltage electrical equipment by current transformer 3；
2）Measurement and control unit 4 judges whether electric current is more than preset protection definite value, if it exceeds protection definite value then redirects execution step
3）；Otherwise, it redirects and executes step 1）；
3）Measurement and control unit 4 generates continuous multiple current impulses by pulse generating unit 2 so that spark point 12 and hemisphere face electricity
Spark discharge is generated between pole 11, causes to protect main gap electric field distortion after spark discharge generation, causes to protect main gap exhausted
Edge is resistant to strength reduction, enables protection main gap generate penetrability electric discharge under operating voltage effect, to bypass electrical equipment
From heavy current impact.The block capacitor is directed in the present embodiment, the preset protection definite value of setting is 10kA, when flow through every
When the fault current of straight capacitor is more than 10kA, measurement and control unit 4 detects fault current by current sensor 5, that is, controls arteries and veins
It rushes generating means 2 and generates continuous multiple current impulses so that controllable portable protective gaps only have 1kV reliably to move in power-frequency voltage
Make, to protect block capacitor.
Controllable portable protective gaps and its application process under the high current of the present invention of above structure, are proved to imitate through manufacturing experimently to try out
Fruit is good, esy to use, safe and reliable, and design requirement is fully achieved.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (4)
1. controllable portable protective gaps under a kind of high current, it is characterised in that：Including gap component（1）, pulse generating unit（2）, electricity
Current transformer（3）And measurement and control unit（4）, the gap component（1）The two hemisphere face electrodes arranged by gap（11）Composition, and
Two hemisphere face electrodes（11）Spherical surface formation positioned opposite protect main gap, and wherein at least one hemisphere face electrode（11）'s
Spherical surface is equipped with towards another hemisphere face electrode（11）Arrangement and the spark point of connection conducting（12）, the pulse generation dress
It sets（2）Output end and spark point（12）Connection conducting, two hemisphere face electrodes（11）It is connected in parallel on protected High-Voltage Electrical Appliances
The both ends of equipment, the current transformer（3）It is arranged on the current loop of protected high-voltage electrical equipment, and the electric current
Mutual inductor（3）Output end and measurement and control unit（4）It is connected, the measurement and control unit（4）Output end and pulse generating unit（2）'s
Control terminal is connected.
2. controllable portable protective gaps under high current according to claim 1, it is characterised in that：Described two hemisphere face electrodes
（11）In a hemisphere face electrode（11）It is fixed on the screw rod for adjusting protection main gap width（13）Upper and and spiral shell
Bar（13）Screw-thread fit, the screw rod（13）Along the width direction arrangement of protection main gap.
3. controllable portable protective gaps under high current according to claim 1, it is characterised in that：The pulse generating unit（2）
Including rectifier bridge（21）, charging capacitor（22）, IGBT module（23）And high-frequency pulse transformer（24）, the rectifier bridge（21）'s
Input terminal is connected with external power supply, the charging capacitor（22）It is arranged in parallel at rectifier bridge（21）Output end, the rectifier bridge
（21）Output end, IGBT module（23）, high-frequency pulse transformer（24）Primary side join end to end successively forming circuit, the survey
Control unit（4）Output end and IGBT module（23）Control terminal be connected, the high-frequency pulse transformer（24）Secondary side one end
Ground connection, the other end and spark point（12）Connection conducting.
4. the application process of controllable portable protective gaps, feature exist under the high current described in a kind of any one of claims 1 to 3
Include in implementation steps：
1）The measurement and control unit（4）Pass through current transformer（3）Detect the electric current of protected high-voltage electrical equipment；
2）The measurement and control unit（4）Judge whether electric current is more than preset protection definite value, if it exceeds protection definite value is then redirected and held
Row step 3）；Otherwise, it redirects and executes step 1）；
3）The measurement and control unit（4）Pass through pulse generating unit（2）Generate continuous multiple current impulses so that spark point（12）
With hemisphere face electrode（11）Between generate spark discharge, spark discharge generation after cause protect main gap electric field distortion, cause
Main gap insulation tolerance strength reduction is protected, order protection main gap generates penetrability electric discharge under operating voltage effect, thus will
Electrical equipment is bypassed from heavy current impact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810514818.3A CN108683165A (en) | 2018-05-25 | 2018-05-25 | Controllable portable protective gaps and its application process under a kind of high current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810514818.3A CN108683165A (en) | 2018-05-25 | 2018-05-25 | Controllable portable protective gaps and its application process under a kind of high current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108683165A true CN108683165A (en) | 2018-10-19 |
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ID=63808185
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810514818.3A Pending CN108683165A (en) | 2018-05-25 | 2018-05-25 | Controllable portable protective gaps and its application process under a kind of high current |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU777771A1 (en) * | 1979-01-15 | 1980-11-07 | Кузбасский Политехнический Институт | Overvoltage limiting device |
| CN201134670Y (en) * | 2007-12-14 | 2008-10-15 | 西安盟创电器有限公司 | Grounding protecting equipment for controllable current limiting neutral point |
| CN102185279A (en) * | 2011-05-19 | 2011-09-14 | 重庆电力科学试验研究院 | Overvoltage protection device for neutral point of transformer |
| CN202997557U (en) * | 2012-12-26 | 2013-06-12 | 宁夏电力公司吴忠供电局 | Controllable trigger device for protecting 110kV transformer neutral point |
| CN205811275U (en) * | 2016-04-14 | 2016-12-14 | 云南电网有限责任公司曲靖供电局 | A kind of can the controlled sphere gap switch of semi-enclosed electric discharge of remote reviewing |
| CN206193140U (en) * | 2016-11-10 | 2017-05-24 | 云南电网有限责任公司大理供电局 | Air -core type reactor turn to turn short -circuit test circuit |
-
2018
- 2018-05-25 CN CN201810514818.3A patent/CN108683165A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU777771A1 (en) * | 1979-01-15 | 1980-11-07 | Кузбасский Политехнический Институт | Overvoltage limiting device |
| CN201134670Y (en) * | 2007-12-14 | 2008-10-15 | 西安盟创电器有限公司 | Grounding protecting equipment for controllable current limiting neutral point |
| CN102185279A (en) * | 2011-05-19 | 2011-09-14 | 重庆电力科学试验研究院 | Overvoltage protection device for neutral point of transformer |
| CN202997557U (en) * | 2012-12-26 | 2013-06-12 | 宁夏电力公司吴忠供电局 | Controllable trigger device for protecting 110kV transformer neutral point |
| CN205811275U (en) * | 2016-04-14 | 2016-12-14 | 云南电网有限责任公司曲靖供电局 | A kind of can the controlled sphere gap switch of semi-enclosed electric discharge of remote reviewing |
| CN206193140U (en) * | 2016-11-10 | 2017-05-24 | 云南电网有限责任公司大理供电局 | Air -core type reactor turn to turn short -circuit test circuit |
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Application publication date: 20181019 |
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