CN107171245A - Live working of distribution network zero potential control method - Google Patents
Live working of distribution network zero potential control method Download PDFInfo
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- CN107171245A CN107171245A CN201710544307.1A CN201710544307A CN107171245A CN 107171245 A CN107171245 A CN 107171245A CN 201710544307 A CN201710544307 A CN 201710544307A CN 107171245 A CN107171245 A CN 107171245A
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- voltage
- distribution network
- ground
- zero potential
- setting
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B3/00—Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of live working of distribution network zero potential control method, during livewire work, the mutually additional earthing or grounding means of operation near livewire work point, or current source or voltage-to-ground source over the ground are installed in transformer station, or the shunting tap shorted to earth of the operation grid side winding in transformer, so that by setting voltage control to safe operation range.Present invention can apply to the split-phase operation of the overhead transmission line of non-effective earthing power distribution network or cable run, can be by setting voltage control to manual security's job area, the safe livewire work and not power-off fault that power distribution network setting zero potential can even be realized are removed, advantageously reduce the personal safety risk of high-voltage hot-line work, class of safety protection during reduction livewire work over the ground, simplifies operation procedure, reduces operating cost, shorten the activity duration, realize safe and efficient livewire work.
Description
Technical field
The present invention relates to live working of distribution network technical field；More particularly to a kind of live working of distribution network zero potential control
Method.
Background technology
Power distribution network is the important component of China's power network, and it is when reducing power distribution network to have a power failure to carry out live working of distribution network
Between, one of the important means that improves distribution network reliability and good service level.At present, live working of distribution network is at home
Carry out extensively outside, be broadly divided into insulating bar working system (also referred to as indirect operating method) and insulating glove working system is (also referred to as straight
Connect working system).The former be by major insulation of insulating tool, insulating protection apparatus for supplementary insulation indirect operating method；The latter is
Insulation arm or insulated platform using aerial lift device with insulated arm is major insulation, and operating personnel has on insulating glove and directly contacts the straight of electrical body
Connect working system.
But live working of distribution network is different from being difficult to meet peace in power transmission network, its livewire work narrow space, operation process
Full distance requirement.When implementing livewire work using aerial lift device with insulated arm, its operation height must not be less than 3.5 meters；And real work ring
In border, the height of part power distribution network maintenance operation only have 3 meters it is even lower, and because working space is narrow, cause insulation to struggle against
Arm car can not implement operation.Therefore, patent " a kind of 10kV distribution lines and equipment live operational method ", Application No.：
201611005664.2, it is proposed that a kind of distribution line and equipment live operational method suitable in small space, pass through system
Determine construction operation scheme, high-efficient homework is realized with the use of insulating tool；Patent " livewire work method ", Application No.：
201410359956.0, it is proposed that a kind of livewire work method, by working region set insulated target with cover band electrician
Make the electrical body in addition to part to be operated in region, the probability that reduction live line work personnel get an electric shock in the course of the work.
Above prior art is substantially to handle livewire work human safety issues from the angle of insulating protection, not from reduction
Livewire work human safety issues, have the following disadvantages from the point of view of setting voltage：(1) setting voltage can not be controlled
Into manual security's job area, it is impossible to realize the safe livewire work of zero potential, there is personal safety wind in high-voltage hot-line work
Danger；(2) class of safety protection is high over the ground during existing equipment livewire work, and operating cost is high, and complex operation, the activity duration is long, nothing
Method realizes safe and efficient livewire work.
The content of the invention
In order to overcome the defect of above-mentioned prior art, the invention provides a kind of live working of distribution network zero potential controlling party
Method, by by setting voltage control to safe operation range, realizing safe and efficient livewire work.
The purpose of the present invention is achieved through the following technical solutions：
During livewire work, the mutually additional earthing or grounding means of operation near livewire work point, or install electric over the ground in transformer station
Stream source or voltage-to-ground source, or the operation grid side winding in transformer shunting tap shorted to earth so that by setting electricity
It is voltage-controlled to make into safe operation range.
In order to which goal of the invention is better achieved, the present invention can further use following technological means：
Between the current source or voltage source access operation power network bus and ground, or between circuit and ground, or neutral point with
Between ground, or transformer operation grid side winding shunting tap and ground between.
Further, the voltage of the voltage source output is：Make the reduction of setting voltage；WhereinIt is
Access point normal voltage under the non-access conditions in normal grid voltage source, residual voltage variable quantityBy formulaMeter
Calculate,For the residual voltage under normal running (operation) conditions,For the residual voltage behind applied voltage source,
For the supply voltage of operation phase,For the voltage drop between operation phase bus and setting,For setting voltage, value model
Enclose forThe maximum voltage allowed for setting safety work.
Further, the electric current of the current source output is：Wherein Σ Y0For power distribution network zero sequence over the ground
Admittance.
Further, the choosing method of the shunting tap of the shorted to earth is：Transformer is defined to compile per phase shunting tap
Number from neutral point to export it is incremented by successively, during livewire work, selection neutral point be more than or equal to the coil turn of the tapShunting tap shorted to earth, selection shunting tap numbering it is bigger, setting voltage is lower；WhereinFor the voltage of operation phase bus, N is the total number of turns of operation phase winding.
Further, before and after the livewire work point inside and outside 300 meters plus earthing or grounding means.
Further, the current source is the power supply that controllable current is produced using power electronic devices or control device, electricity
Potential source is the power supply that controllable voltage is produced using power electronic devices or control device.
The beneficial effects of the invention are as follows：
(1) person of livewire work can be reduced by power distribution network setting voltage control to manual security's job area
Security risk, while taking into account power supply reliability and operating personnel's Personal Safety, or even can realize the electricity of power distribution network setting zero
The safe livewire work of position；(2) class of safety protection when can reduce livewire work over the ground, simplifies operation procedure, and reduction is made
Industry cost, shortens the activity duration, realizes safe and efficient livewire work.
Brief description of the drawings
Fig. 1 is the live working of distribution network zero potential control principle drawing of the additional earthing or grounding means near livewire work point.
Fig. 2 is the live working of distribution network zero potential control principle drawing that current source is installed in transformer station.
Fig. 3 is the live working of distribution network zero potential control principle drawing that voltage source is installed in transformer station.
Fig. 4 is to set multiple shunting taps in transformer non-effective earthing distribution source side winding, and selects operation phase winding
Shunting tap shorted to earth live working of distribution network zero potential control principle drawing.
Embodiment
The basic functional principle of the present invention is as follows：During livewire work, the mutually additional ground connection of operation near livewire work point
Device, or it is short over the ground in transformer station's installation current source or voltage source, or the shunting tap of the operation grid side winding in transformer
Road, so that by setting voltage control to safe operation range, its safety work voltage range is：No more than 500V.
The content of the invention to the present invention is further described and explained below in conjunction with the accompanying drawings.
As shown in figure 1, in non-effective earthing power distribution network,Respectively system three-phase mains voltage, C0
For system direct-to-ground capacitance, r0For system bleeder resistance, A over the groundS、BS、CSFor Y/ delta connections transformer non-effectively earthed system side around
Group, SA, SB, SCFor switch, M is earthing or grounding means, and one end lead-out wire of transformer non-effectively earthed system side winding directly has with non-
Effect earthed system A, B, C tri- is connected, and transformer non-effectively earthed system side winding is extraction neutral point N after star-star connection and passed through again
Impedance Z is grounded；as、bs、csFor step down side winding, low-pressure side winding uses delta connection, such as need to be in power distribution network C phases
D points carry out livewire work, before D points 50 meters additional earthing or grounding means M is set, and S will be switchedCClosure, then with switch SCEven
The ground connect is zero, so that by the voltage control of setting D points to safety work voltage range.
As shown in Fig. 2 in non-effective earthing power distribution network,Respectively system three-phase mains voltage, C0
For system direct-to-ground capacitance, r0For system bleeder resistance, A over the groundS、BS、CSFor Y/ delta connections transformer non-effectively earthed system side around
Group, S is switch, one end lead-out wire of transformer non-effectively earthed system side winding directly with non-effectively earthed system A, B, C tri-
It is connected, transformer non-effectively earthed system side winding is extraction neutral point N after star-star connection and is grounded again through impedance Z；as、bs、cs
For step down side winding, low-pressure side winding uses delta connection,For the electricity between operation phase bus and setting D
Pressure drop；Such as need to power distribution network C phases D points carry out livewire work, non-effectively earthed system side bus with ground, or circuit with
Ground, or neutral point and ground, or transformer T1Applied voltage source between the shunting tap and ground of winding(can be single-phase voltage-to-ground
Source or residual voltage source), the voltage-to-ground of whole distribution system will be caused while being raised and lowered, variable quantity is：ThenThen whereinIt is the access point normal voltage under the non-access conditions in normal grid voltage source, residual voltage change
AmountBy formula
Calculate,For the residual voltage under normal running (operation) conditions,For the zero sequence electricity behind applied voltage source
Pressure,WhereinFor setting voltage, span isPacify for setting
The maximum voltage that full operation is allowed, as known from the above：
Therefore it was found from formula (1), regulate and control applied voltage sourceIt can realize to setting voltageControl, Injection Current is strong
Compel setting voltage to decline, the maximum voltage that setting safety work is allowed is no more than when dropping toWhen, realize power distribution network
The powered safety work of setting.
As shown in figure 3, in non-effective earthing power distribution network,Respectively system three-phase mains voltage,
C0For system direct-to-ground capacitance, r0For system bleeder resistance, A over the ground1、B1、C1、A2、B2、C2For Z-type grounding transformer non-effective earthing
System side winding, S is switch, and one end lead-out wire of transformer non-effectively earthed system side winding is directly and non-effectively earthed system
A, B, C tri- is connected, and transformer non-effectively earthed system side winding does the other end after Z-type connection and draws neutral point N again through resistance
Anti- Z ground connection；a1、b1、c1For grounding transformer low-pressure side winding, low-pressure side winding uses star-star connection, exit a, b, c, n
Represent,For residual voltage,For the voltage drop between operation phase bus and setting D,For setting voltage, value
Scope isThe maximum voltage allowed for setting safety work；It need to such as be carried out in the D points of power distribution network C phases
Livewire work, between transformer non-useful earthing electric network neutral point and ground impressed current source (can for single-phase current source over the ground or
Zero-sequence current source), regulate and control current source toward system Injection CurrentFrom Kirchhoff's law：
ω is system angular frequency in formula (2).CauseIf three phase mains is symmetrical,
Obtained for above formula：
Consider the three residual voltage shadows that relatively parameter unbalance is produced under non-effectively earthed system normal running (operation) conditions
Ring, the residual voltage U in formula (3)0Use residual voltage variable quantityInstead of then formula (3) can be changed to：
Wherein Σ Y0For power distribution network zero sequence admittance over the ground,For the residual voltage under normal running (operation) conditions.
Therefore it was found from formula (4), regulate and control Injection CurrentIt can realize to setting voltageControl, Injection Current forces
Setting voltage declines, and the maximum voltage that setting safety work is allowed is no more than when dropping toWhen, realize that power distribution network is made
The powered safety work of industry point.
It is another it should be noted that, such as need to carry out livewire work in the D points of power distribution network C phases, take impressed current source Injection Current
Realize that setting zero potential is controlled, Injection CurrentUniquely determined, and connect from transformer is non-effective by the desired value of setting voltage
Ground grid side winding C1Shunting tap, the purpose can be achieved in or bus, or neutral point, or circuit injection.
As shown in figure 4, in non-effective earthing power distribution network,Respectively system three-phase mains voltage, C0
For system direct-to-ground capacitance, r0For system bleeder resistance over the ground, As, Bs, Cs are Y/ delta connection transformer non-effectively earthed systems side
Winding, S is switch, one end lead-out wire of transformer non-effectively earthed system side winding directly with non-effectively earthed system A, B, C
Three are connected, and transformer non-effectively earthed system side winding is extraction neutral point N after star-star connection and is grounded again through impedance Z；as、bs、
csFor step down side winding, low-pressure side winding uses delta connection,For operation phase busbar voltage,For zero sequence electricity
Pressure,For the voltage drop between operation phase bus and setting D,For setting voltage, span is
The maximum voltage allowed for setting safety work；In transformer non-effective earthing distribution source side winding, multiple shunting taps are set
(so-called multiple shunting taps refer to that the shunting tap summation of A, B, C three-phase windings is three or more than three), and per phase winding
Shunting tap quantity set scope to be 1-30, definition is incremented by successively from neutral point to exporting per phase shunting tap numbering, such as
Livewire work need to be carried out in the D points of power distribution network C phases, selection neutral point is more than or equal to the coil turn of the tapShunting tap X shorted to earths, selection shunting tap numbering it is bigger, setting voltage is lower, whereinFor the voltage of operation phase bus, N is the total number of turns of operation phase winding, now corresponding operation phase bus electricity
Pressure is also referred to as：NXFor shunting tap X in operation phase winding to neutral point coil turn
Number, then have：
Therefore it was found from formula (5), selection shunting tap shorted to earth can be realized to setting voltageControl, force work
Industry point voltage declines, and the maximum voltage that setting safety work is allowed is no more than when dropping toWhen, realize power distribution network operation
The powered safety work of point.
Claims (7)
1. a kind of live working of distribution network zero potential control method, it is characterised in that：During livewire work, near livewire work point
The mutually additional earthing or grounding means of operation, or current source or voltage-to-ground source over the ground are installed in transformer station, or in the operation electricity of transformer
The shunting tap shorted to earth of source side winding, so that by setting voltage control to safe operation range.
2. a kind of live working of distribution network zero potential control method according to claim 1, it is characterised in that：The electric current
Between source or voltage source access operation power network bus and ground, or between circuit and ground, or between neutral point and ground, or transformer
Between the shunting tap and ground of operation grid side winding.
3. a kind of live working of distribution network zero potential control method according to claim 1, it is characterised in that：The voltage
Source output voltage be：, make the reduction of setting voltage；WhereinIt is the non-access conditions in normal grid voltage source
Under access point normal voltage, residual voltage variable quantityBy formulaCalculate,For under normal running (operation) conditions
Residual voltage,For the residual voltage behind applied voltage source,,For the supply voltage of operation phase,For the voltage drop between operation phase bus and setting,For setting voltage, span is,
The maximum voltage allowed for setting safety work.
4. a kind of live working of distribution network zero potential control method according to claim 1, it is characterised in that：The electric current
Source output electric current be：, whereinFor power distribution network zero sequence admittance over the ground.
5. a kind of live working of distribution network zero potential control method according to claim 1, it is characterised in that：It is described over the ground
The choosing method of shunting tap of short circuit is：Define transformer incremented by successively from neutral point to exporting per phase shunting tap numbering,
During livewire work, selection neutral point is more than or equal to the coil turn of the tapShunting tap shorted to earth,
The shunting tap numbering of selection is bigger, and setting voltage is lower；WhereinFor the voltage of operation phase bus,NFor
The total number of turns of operation phase winding.
6. a kind of live working of distribution network zero potential control method according to claim 1, it is characterised in that：Make powered
Add earthing or grounding means before and after industry point inside and outside 300 meters.
7. a kind of live working of distribution network zero potential control method according to claim 1, it is characterised in that：The electric current
Source is the power supply that controllable current is produced using power electronic devices or control device, and voltage source is to use power electronic devices or control
Device processed produces the power supply of controllable voltage.
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| CN201710544307.1A CN107171245B (en) | 2017-07-05 | 2017-07-05 | Live working of distribution network zero potential control method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109358262A (en) * | 2018-12-20 | 2019-02-19 | 国网江苏省电力有限公司经济技术研究院 | A kind of singlephase earth fault method for removing for taking into account personal safety and power supply reliability |
| CN111525441A (en) * | 2020-04-30 | 2020-08-11 | 国网湖南省电力有限公司 | Uninterrupted operation method for operation point |
| CN112269049A (en) * | 2020-10-14 | 2021-01-26 | 广西电网有限责任公司电力科学研究院 | Method and system for measuring capacitance-to-ground current of power distribution network |
| CN112269145A (en) * | 2020-10-14 | 2021-01-26 | 广西电网有限责任公司电力科学研究院 | Zero potential fault clearing method and system for power distribution network |
| CN112909685A (en) * | 2021-01-26 | 2021-06-04 | 广东电网有限责任公司梅州供电局 | Closed type safe grounding wire method |
-
2017
- 2017-07-05 CN CN201710544307.1A patent/CN107171245B/en active Active
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109358262A (en) * | 2018-12-20 | 2019-02-19 | 国网江苏省电力有限公司经济技术研究院 | A kind of singlephase earth fault method for removing for taking into account personal safety and power supply reliability |
| CN111525441A (en) * | 2020-04-30 | 2020-08-11 | 国网湖南省电力有限公司 | Uninterrupted operation method for operation point |
| CN112269049A (en) * | 2020-10-14 | 2021-01-26 | 广西电网有限责任公司电力科学研究院 | Method and system for measuring capacitance-to-ground current of power distribution network |
| CN112269145A (en) * | 2020-10-14 | 2021-01-26 | 广西电网有限责任公司电力科学研究院 | Zero potential fault clearing method and system for power distribution network |
| CN112269145B (en) * | 2020-10-14 | 2023-04-07 | 广西电网有限责任公司电力科学研究院 | Zero potential fault clearing method and system for power distribution network |
| CN112269049B (en) * | 2020-10-14 | 2023-08-22 | 广西电网有限责任公司电力科学研究院 | Power distribution network capacitance-to-ground current measurement method and system |
| CN112909685A (en) * | 2021-01-26 | 2021-06-04 | 广东电网有限责任公司梅州供电局 | Closed type safe grounding wire method |
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