CN103683187B - Nuclear power station two-part leak current fault guard method - Google Patents
Nuclear power station two-part leak current fault guard method Download PDFInfo
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- CN103683187B CN103683187B CN201310644140.8A CN201310644140A CN103683187B CN 103683187 B CN103683187 B CN 103683187B CN 201310644140 A CN201310644140 A CN 201310644140A CN 103683187 B CN103683187 B CN 103683187B
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Abstract
The invention belongs to nuclear power plant design technology, be specifically related to a kind of nuclear power station two-part leak current fault guard method.The method configures one group of two-part leak current fault protector on the nuclear power station low-voltage distribution system mesolow distribution transformer neutral point connecting line with earthed system; complete first stage leakage-current alarm; second stage singlephase earth fault two functions of tripping operation, the protection signal of two-part leak current fault protector derives from and is arranged on transformer neutral point and the current transformer on the connecting line of earthed system.The present invention has highly sensitive, and equipment is succinct, fully functional feature, can be widely popularized in nuclear power station low-voltage distribution system earth-fault protection designs.
Description
Technical field
The invention belongs to nuclear power plant design technology, be specifically related to a kind of nuclear power station two-part leak current fault protection side
Method.
Background technology
For the earth fault in a power supply institute supply district is taken precautions against, need to install total at this power supply
RCD, to realize the earth-fault protection in full supply district.
At present, during industry designs with Domestic distribution, it is most commonly that in transformator outlet the big specified electricity of dress
Stream frame-type circuit breaker, its subsidiary earth-fault protection function, as in figure 2 it is shown, i.e. take from A, B, C, N
On current transformer 003TI to the subsidiary 003XI earth-fault protection of chopper, it is achieved to power supply
Earth fault in institute's supply district is taken precautions against.The earth-fault protection setting current that this scheme is implemented is big, right
Anti-electric shock and antiground electric arc fire work hardly, and its effect is to improve PE when there is earth fault
The sensitivity of the over-current protection of line insulation.
Another way is to arrange 002TI, takes zero-sequence current to special relay-set 002XI, it is achieved ground connection
Error protection, as in figure 2 it is shown, the program does not fills with big rated current frame-type open circuit in transformator outlet
Device.But this kind of way can be only done the single phase earthing protection function of low-voltage distribution system, owing to it is adjusted
Should escape properly functioning maximum three phase unbalance current, harmonic current and normal Leakage Current sum, therefore nothing
Method realizes the creepage protection function to whole distribution system, i.e. cannot realize the electricity of the antiground to full supply district
Arc fire function.
Summary of the invention
It is an object of the invention to provide a kind of low-voltage distribution system whole to nuclear power station and implement two-part electric leakage
The method of error protection, it is highly sensitive, and equipment is succinct, fully functional.
Technical scheme is as follows: a kind of nuclear power station two-part leak current fault guard method, at nuclear power
Low-voltage distribution system of standing mesolow distribution transformer neutral point configures one group two on the connecting line of earthed system
Segmentation leak current fault protector, two-part leak current fault protector respectively with master control room control rack and
6.6kV Medium voltage switch or circuit breaker is connected, and completes first stage leakage-current alarm, and second stage singlephase earth fault is jumped
Two functions of lock, the protection signal of two-part leak current fault protector derives from and is arranged on transformer neutral point
With the current transformer on the connecting line of earthed system.
Further, nuclear power station two-part leak current fault guard method as above, wherein, described two
Segmentation leak current fault protector realizes two threshold value outputs, and the signal output of first threshold controls to master control room
Rack, it is achieved warning function of electric leakage, plays antiground electric arc fire effect in full supply district, configures whole
Total residual current protecting of individual low-voltage distribution system；The signal output of Second Threshold presses off to 6.6kV
Close, it is achieved singlephase earth fault trip avoidance function, whole low-voltage distribution system implemented earth-fault protection,
Configuration zero-sequence current protection.Described two-part leak current fault protector is two-part leakage relay.
Further, nuclear power station two-part leak current fault guard method as above, wherein, described change
Depressor is D, yn11 mesolow distribution transformer.
Beneficial effects of the present invention is as follows:
The present invention is utilized in arranging on transformer neutral point and the connecting line of earthed system highly sensitive
Earth-fault relay, low-voltage distribution system earth-fault protection signal derives from and is installed in neutral point and connects
Current transformer on the connecting line of ground system, what its residual current protecting was detected is during three-phase current adds
Property line current phasor and, its embodiment is simple, feasible.Earth-fault current return power supply one be through
PE line, another is through the earth.The earth-fault current that in transformator institute supply district, arbitrary place occurs all may be used
To be detected, more just can act on tripping operation by the most supporting relay or report to the police.This mutual inductance
Device size is little, simple installation, and its no-load voltage ratio is the least, and action sensitivity is the highest, can be at full supply district
The interior effect playing antiground electric arc fire.And during industry designs with Domestic distribution, be in transformator outlet
The dress big rated current frame-type circuit breaker of failure protection function with ground, its setting current is the most disconnected
The 20% of road device rated current, this action current value is very big, several to anti-electric shock and antiground electric arc fire
Inoperative, its effect is the over-current protection improving PE line insulation when there is earth fault
Sensitivity.It need to install current transformer in phase line and the neutral conductor, takes its secondary circuit parallel connection and realizes
The detection of residual current, owing to this current transformer has the biggest no-load voltage ratio, the ground connection event being placed in chopper
Barrier protection is difficult to improve its protection sensitivity.
Secondly, the present invention is two-part leakage to the earth-fault relay that nuclear power station low-voltage distribution system is arranged
Electric fault protector, first stage electric leakage realizes warning function, plays antiground electric arc in full supply district
Fire effect, its essential meaning is the total residual current protecting configuring whole low-voltage distribution system.The
Two-stage earth fault acts on tripping operation, it is achieved the earth-fault protection to whole low-voltage distribution system, its
Essential meaning is configuration zero-sequence current protection.Two ways makes the earth fault of whole low-voltage distribution system protect
It is complete, reasonable to protect, and implements effectively.
3rd, the second stage earth-fault signal source of the two-part leak current fault protector owing to arranging
In the current transformer being installed on the transformer neutral point connecting line with earthed system, it is not necessary to consider to avoid
The three phase unbalance current of transformer low voltage distribution system, it is only necessary to consider and the earth fault on low-pressure line-outgoing
Protection device matches, simplification of adjusting.
Accompanying drawing explanation
Fig. 1 is the relaying configuration figure of the present invention；
Fig. 2 is the relaying configuration detailed annotation schematic diagram of the present invention.
Detailed description of the invention
With embodiment, the present invention is described in detail below in conjunction with the accompanying drawings.
Embodiment
In embodiments of the present invention, as it is shown in figure 1, the low-voltage distribution system two-part leak current fault of the present invention
Design protection method includes:
D to low-pressure side neutral-point solid ground, yn11 mesolow distribution transformer, transformer neutral point with
Arranging current transformer 001TI on the connecting line of earthed system, this kind of current transformer size is little, installs letter
Just.
Match a set of two-part leak current fault protector 001XI, from the connection of transformer neutral point Yu earthed system
The current transformer 001TI secondary side number of winning the confidence arranged on line, two different threshold values outputs, act on respectively
In first stage leakage-current alarm, second stage singlephase earth fault trips.
In Fig. 1, two-part leak current fault protector 001XI and 6.6kV Medium voltage switch or circuit breaker 001JA dotted line phase
Even, refer to have control cable to deliver to 001JA from 001XI, it is achieved trip avoidance function 001JA.001TI selects routine
Current transformer, there is no special technology requirement, such as: LMZJ1-0.66500/5A;001XI is two
Segmentation leak current fault protector, is a kind of high accuracy, high-sensitive relay protector, such as: LEG-173LS;
001XI detects the earth fault alarming value of second stage, then signal and pass to 001JA by control cable,
Tripping operation.
As in figure 2 it is shown, during industry designs with Domestic distribution at present, be most commonly that in transformator outlet dress
By big rated current frame-type circuit breaker, its subsidiary earth-fault protection function, i.e. take from A, on B, C, N
Current transformer 003TI to the subsidiary 003XI earth-fault protection of chopper, it is achieved to power supply institute
Earth fault in supply district is taken precautions against.It is analyzed the most in the introduction for the shortcoming of earth-fault protection,
Do not repeat at this to discuss.
Another way is to arrange 002TI, takes zero-sequence current to special relay-set 002XI, it is achieved ground connection
Error protection, as in figure 2 it is shown, be also not fill with big rated current frame-type circuit breaker in transformator outlet.
But this kind of way can be only done the single phase earthing protection function of low-voltage distribution system, adjusts should hide due to it
Cross properly functioning maximum three phase unbalance current, harmonic current and normal Leakage Current sum, therefore cannot be real
The now creepage protection function to whole distribution system, i.e. cannot realize the fire of the antiground electric arc to full supply district
Calamity function.
As it is shown in figure 1, the low-voltage distribution system two-part leak current fault of the present invention is protected not in transformator outlet
Upper dress is with big rated current frame-type circuit breaker, and the earth fault strick precaution in supply district is used and sets by it
Put single current transformer action in corresponding earth fault protection relay, make a concrete analysis of as follows:
Only current transformer 001TI, signal function are set on the transformer neutral point connecting line with earthed system
In highly sensitive two-part leak current fault protector 001XI.What its residual current protecting was detected is three-phase electricity
Stream add neutral current phasor and, i.e. IPE=IU+IV+IW+IN(the I when neutral conductor is not allottedPE=IU+IV+
IW), this embodiment is simple, feasible.It is through PE line that earth-fault current returns power supply one, and another is through greatly
Ground.Current transformer 001TI is installed on position shown in Fig. 2, and in transformator institute supply district, arbitrary place is sent out
Raw earth-fault current can be detected, more just can be made by the most supporting relay 001XI
For tripping or reporting to the police.This transformer size is little, simple installation, and its no-load voltage ratio is the least, is active in one's movements
Spend the highest, the effect of antiground electric arc fire can be played in full supply district.
The earth-fault relay 001XI of configuration, for two-part leak current fault protector, first threshold exports,
Realizing warning function of electric leakage, object output is master control room DCS rack, plays antiground electricity in full supply district
Arc fire effect, its essential meaning is the total residual current protecting configuring whole low-voltage distribution system.The
Two threshold value outputs, it is achieved ground fault trip function, object output is 6.6kV Medium voltage switch or circuit breaker, to whole low
Pressure distribution system implements earth-fault protection, and its essential meaning is configuration zero-sequence current protection.Two ways makes
The earth-fault protection of whole low-voltage distribution system is complete, reasonable, implements effectively.Concrete mode is: two
Segmentation leak current fault relay 001XI gathers current signal, and current value, when first threshold (less), is sent out
Signal is reported to the police to master control room DCS, and current value, when Second Threshold (bigger), signals in tripping operation 6.6kV
Compress switch, it is achieved defencive function.Described threshold value is the electric current gathered, and is a current value.
Just as described in specification, earth-fault protection is anti-mediate contact electric shock and the protection of antiground electric arc fire,
The nuclear power station two-part leak current fault design protection of the present invention is to low-voltage distribution system earth-fault protection
Planting effective implementing method, this method for designing is implemented in nuclear power engineering, and by designing, debugging and transport
Row feedback, have accumulated abundant experience of adjusting, can be widely popularized in nuclear power station low-voltage distribution system earth fault
In design protection.
Obviously, those skilled in the art can carry out various change and modification without deviating from this to the present invention
The spirit and scope of invention.So, if these amendments and modification to the present invention belong to right of the present invention
Require and within the scope of equivalent technology, then the present invention is also intended to comprise these change and modification.
Claims (3)
1. a nuclear power station two-part leak current fault guard method, it is characterised in that: in nuclear power station low pressure
One group of two-part leakage is configured on distribution system mesolow distribution transformer neutral point and the connecting line of earthed system
Electric fault protector, two-part leak current fault protector controls with master control room to press in rack and 6.6kV respectively
Switch is connected, and completes first stage leakage-current alarm, second stage singlephase earth fault two functions of tripping operation,
The protection signal of two-part leak current fault protector derives from and is arranged on transformer neutral point and earthed system
Current transformer on connecting line；Described two-part leak current fault protector realizes two threshold value outputs,
The signal output of first threshold controls rack to master control room, it is achieved warning function of electric leakage, at full supply district
Interior antiground electric arc fire effect, configures total residual current protecting of whole low-voltage distribution system；The
The signal of two threshold values exports to 6.6kV Medium voltage switch or circuit breaker, it is achieved singlephase earth fault trip avoidance function, to whole
Low-voltage distribution system implements earth-fault protection, configures zero-sequence current protection.
2. nuclear power station two-part leak current fault guard method as claimed in claim 1, it is characterised in that:
Described two-part leak current fault protector is two-part leakage relay.
3. nuclear power station two-part leak current fault guard method as claimed in claim 1 or 2, it is characterised in that:
Described transformator is D, yn11 mesolow distribution transformer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310644140.8A CN103683187B (en) | 2013-12-03 | 2013-12-03 | Nuclear power station two-part leak current fault guard method |
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| CN201310644140.8A CN103683187B (en) | 2013-12-03 | 2013-12-03 | Nuclear power station two-part leak current fault guard method |
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| CN103683187A CN103683187A (en) | 2014-03-26 |
| CN103683187B true CN103683187B (en) | 2016-11-16 |
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| CN112909892A (en) * | 2021-03-02 | 2021-06-04 | 四川长虹空调有限公司 | Air conditioner electrical safety control method and system |
| CN113433421A (en) * | 2021-06-16 | 2021-09-24 | 江苏昂内斯电力科技股份有限公司 | Method for centrally monitoring residual current of power distribution system |
| CN114465195A (en) * | 2022-01-07 | 2022-05-10 | 国网河北省电力有限公司磁县供电分公司 | Leakage protection method, ammeter box and power grid system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102227089A (en) * | 2011-06-21 | 2011-10-26 | 珠海银通新动力科技有限公司 | Charging cabinet |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3796428B2 (en) * | 2001-10-17 | 2006-07-12 | 関西電力株式会社 | Distribution line ground fault current amplifier |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102227089A (en) * | 2011-06-21 | 2011-10-26 | 珠海银通新动力科技有限公司 | Charging cabinet |
Non-Patent Citations (1)
| Title |
|---|
| 剩余电流动作保护装置安装注意事项;王世果等;《农村电工》;20090606(第6期);第27-28页 * |
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