CN207518269U - A kind of closed loop network falls load circuit - Google Patents
A kind of closed loop network falls load circuit Download PDFInfo
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- CN207518269U CN207518269U CN201721755580.0U CN201721755580U CN207518269U CN 207518269 U CN207518269 U CN 207518269U CN 201721755580 U CN201721755580 U CN 201721755580U CN 207518269 U CN207518269 U CN 207518269U
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Abstract
Load circuit is fallen the utility model proposes a kind of closed loop network, and including first line and the second circuit, first line is connected with the second circuit；First line includes the first main transformer equivalent impedance XT1, first segment feed line impedance, second segment feed line impedance and third section feed line impedance, the first main transformer equivalent impedance XT1It is connected with first segment feed line impedance, the second circuit includes the second main transformer equivalent impedance XT2, the 4th section of feed line impedance, the 5th section of feed line impedance and the 6th section of feed line impedance, the second main transformer equivalent impedance XT2Respectively with the first main transformer equivalent impedance XT1It is connected with the 4th section of feed line impedance, is connected between the 6th section of feed line impedance and third section feed line impedance by cyclization switch.The utility model facilitates the Line Flow during analysis distribution network closed loop Loop Closing Operation of falling load, it can strengthen the power supply reliability of distribution network, it ensure that the power supply flexibility of distribution network, improve the economy of distribution network operation, there is significant Social benefit and economic benefit.
Description
Technical field
Load circuit is fallen the utility model is related to the technical field of power distribution network more particularly to a kind of closed loop network.
Background technology
As society and expanding economy, requirement of the user to power supply reliability and power quality are also improving, dual power supply
Power supply and multiple feed have become the effective powering mode for improving distribution network reliability.In such a mode, power distribution network one
As use " closed loop design, open loop operation " power supply mode, in line maintenance or load switching, pass through Loop Closing Operation, selection
Appropriate supply path, reduces customer outage hours to the maximum extent, to ensure the reliability of distribution network power supply and flexibility,
The economy of distribution network operation is improved, reduces the influence to user.
But in Loop Closing Operation, because cyclization switch both sides voltage difference, phase difference, distribution line complexity operating parameter,
The reasons such as major network method of operation adjustment unpredictability, may make to generate excessive circulation in the cyclization intermediate ring road of falling load operation, draw
Distribution line over-current protection malfunction is played, and then leads to accident of power supply.The technology analysis means that dispatcher grasps are also extremely limited,
When not stalled electrically operated, previous experience can only be relied on to determine whether cyclization is carried out, in this way, being not only susceptible to judgement
Deviation moreover, lacking the analysis of quantization to the Alloy White Iron being likely to occur, does not have systematic theoretical calculation scheme and assessment to mark
Standard, the result of practical operation have very big randomness, and there is certain operational risks.
Closed loop network falls load and refers between Liang Ge substations or the 10kV interconnections of switchyard by being segmented and joining
Network switch carries out the process of load transfer.If cyclization fall load operation not according to mode list arrange it is planned carry out there may be
Larger operational risk, these exceeded situations of apparatus overload, protective relaying maloperation, short circuit current all may be excessive because of closed loop power flow
And there is false protection etc. during cyclization, the cyclization failure of falling load can not only influence power grid and the safe and stable operation of equipment,
And more client's power supplies can be involved and be affected.
Utility model content
The technical issues of power distribution network safe operation and client power, the utility model can unsuccessfully be influenced by falling load for cyclization
It is proposed that a kind of closed loop network falls load circuit, Line Flow when facilitating the analysis distribution network closed loop Loop Closing Operation of falling load.
In order to achieve the above object, the technical solution of the utility model is realized in：A kind of closed loop network falls negative
Charged road, including first line and the second circuit, first line is connected with the second circuit；The first line includes the first master
Become equivalent impedance XT1, first segment feed line impedance, second segment feed line impedance and third section feed line impedance, the first main transformer equivalent impedance
XT1It is connected with first segment feed line impedance, first segment feed line impedance is connected with second segment feed line impedance, second segment feed line impedance
It is connected with third section feed line impedance；Second circuit includes the second main transformer equivalent impedance XT2, the 4th section of feed line impedance, five
Section feed line impedance and the 6th section of feed line impedance, the second main transformer equivalent impedance XT2Respectively with the first main transformer equivalent impedance XT1With the 4th
Section feed line impedance is connected, and the 4th section of feed line impedance is connected with the 5th section of feed line impedance, the 5th section of feed line impedance and the 6th section
Feed line impedance is connected；It is connected between the 6th section of feed line impedance and third section feed line impedance by cyclization switch.
The first segment feed line impedance, second segment feed line impedance, third section feed line impedance, the 4th section of feed line impedance, the 5th
Section feed line impedance and the 6th section of feed line impedance are 10kV feed line impedances；The first segment feed line impedance includes reactance XL11And electricity
Hinder RL11, second segment feed line impedance is including thinking anchorage XL12With resistance RL12, third section feed line impedance include reactance XL13And resistance
RL13, the first main transformer equivalent impedance XT1, resistance RL11, reactance XL11, resistance RL12, reactance XL12, resistance RL13With reactance XL13Lead to successively
Cross conducting wire connection, reactance XL13It is connected with cyclization switch；4th section of feed line impedance includes impedance XL21With resistance RL21, the 5th section
Feed line impedance includes impedance XL122With resistance RL22, the 6th section of feed line impedance include impedance XL23With resistance RL23, the second main transformer equivalence
Impedance XT2, resistance RL21, reactance XL21, resistance RL22, reactance XL122, resistance RL23With reactance XL23It is sequentially connected by wire, reactance
XL23It is connected with cyclization switch.
The first main transformer equivalent impedance XT1Output end voltage be first line busbar voltage U1, presented into first segment
The initial current of line impedence is I10, initial current I10Power factor be cos φ1；The second main transformer equivalent impedance XT2It is defeated
Go out the busbar voltage U that terminal voltage is the second circuit2, the initial current into the 4th section of feed line impedance is I20, initial current I20's
Power factor is cos φ2。
The beneficial effects of the utility model：Distribution network closed loop fallen load to be summarized as equivalent circuit and analyze, facilitates analysis
Line Flow during the distribution network closed loop Loop Closing Operation of falling load can not only strengthen the power supply reliability of distribution network, but also ensure
The power supply flexibility of distribution network improves the economy of distribution network operation, has significant Social benefit and economic benefit.
Description of the drawings
It in order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the structure diagram of the utility model.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
It clearly and completely describes, it is clear that the described embodiments are only a part of the embodiments of the utility model rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of making the creative labor
All other embodiments obtained shall fall within the protection scope of the present invention.
As shown in Figure 1, a kind of closed loop network falls load circuit, including first line and the second circuit, first line and
Second circuit is connected；The first line includes the first main transformer equivalent impedance XT1, first segment feed line impedance, second segment feeder line resistance
Anti- and third section feed line impedance, the first main transformer equivalent impedance XT1Be connected with first segment feed line impedance, first segment feed line impedance with
Second segment feed line impedance is connected, and second segment feed line impedance is connected with third section feed line impedance；Second circuit includes the
Two main transformer equivalent impedance XT2, the 4th section of feed line impedance, the 5th section of feed line impedance and the 6th section of feed line impedance, the resistance of the second main transformer equivalence
Anti- XT2Respectively with the first main transformer equivalent impedance XT1It is connected with the 4th section of feed line impedance, the 4th section of feed line impedance and the 5th section of feedback
Line impedence is connected, and the 5th section of feed line impedance is connected with the 6th section of feed line impedance；The 6th section of feed line impedance and third section
It is connected between feed line impedance by cyclization switch.
The first segment feed line impedance, second segment feed line impedance, third section feed line impedance, the 4th section of feed line impedance, the 5th
Section feed line impedance and the 6th section of feed line impedance are 10kV feed line impedances；The first segment feed line impedance includes reactance XL11And electricity
Hinder RL11, second segment feed line impedance include reactance XL12With resistance RL12, third section feed line impedance include reactance XL13With resistance RL13,
First main transformer equivalent impedance XT1, resistance RL11, reactance XL11, resistance RL12, reactance XL12, resistance RL13With reactance XL13It passes sequentially through and leads
Line connects, reactance XL13It is connected with cyclization switch；4th section of feed line impedance includes reactance XL21With resistance RL21, the 5th section of feeder line
Impedance includes reactance XL122With resistance RL22, the 6th section of feed line impedance include reactance XL23With resistance RL23, the second main transformer equivalent impedance
XT2, resistance RL21, reactance XL21, resistance RL22, reactance XL122, resistance RL23With reactance XL23It is sequentially connected by wire, reactance XL23
It is connected with cyclization switch.
The first main transformer equivalent impedance XT1Output end voltage be first line busbar voltage U1, presented into first segment
The initial current of line impedence is I10, initial current I10Power factor be cos φ1；The second main transformer equivalent impedance XT2It is defeated
Go out the busbar voltage U that terminal voltage is the second circuit2, the initial current into the 4th section of feed line impedance is I20, initial current I20's
Power factor is cos φ2。
A kind of closed loop network falls the tidal current analysis method of load circuit and is：
The initial current of first line is：,
The initial current of second circuit is：；
Wherein,For initial current I10Concussion frequency,For for initial current I20's
According to circuit theory：
Circulation caused by the voltage differences of cyclization both sides：
, wherein,ZFor the equiva lent impedance of cyclization both sides, value is first segment feed line impedance, second segment section
It is hindered after feed line impedance and the series connection of third section feed line impedance with the 4th section of feed line impedance, the 5th section of section feed line impedance and the 6th section of feeder line
Impedance in parallel after anti-series connection；
The electric current of first line outlet switch is flowed through after cyclization：,
The electric current of the second circuit outlet switch is flowed through after cyclization：。
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model
Protection domain within.
Claims (3)
1. a kind of closed loop network falls load circuit, which is characterized in that including first line and the second circuit, first line and
Two circuits are connected；The first line includes the first main transformer equivalent impedance XT1, first segment feed line impedance, second segment feed line impedance
With third section feed line impedance, the first main transformer equivalent impedance XT1It is connected with first segment feed line impedance, first segment feed line impedance and the
Two sections of feed line impedances are connected, and second segment feed line impedance is connected with third section feed line impedance；Second circuit includes second
Main transformer equivalent impedance XT2, the 4th section of feed line impedance, the 5th section of feed line impedance and the 6th section of feed line impedance, the second main transformer equivalent impedance
XT2Respectively with the first main transformer equivalent impedance XT1It is connected with the 4th section of feed line impedance, the 4th section of feed line impedance and the 5th section of feeder line
Impedance is connected, and the 5th section of feed line impedance is connected with the 6th section of feed line impedance；The 6th section of feed line impedance is presented with third section
It is connected between line impedence by cyclization switch.
2. closed loop network according to claim 1 falls load circuit, which is characterized in that the first segment feed line impedance,
Second segment feed line impedance, third section feed line impedance, the 4th section of feed line impedance, the 5th section of feed line impedance and the 6th section of feed line impedance are equal
For 10kV feed line impedances；The first segment feed line impedance includes reactance XL11With resistance RL11, second segment feed line impedance include reactance
XL12With resistance RL12, third section feed line impedance include reactance XL13With resistance RL13, the first main transformer equivalent impedance XT1, resistance RL11, electricity
Anti- XL11, resistance RL12, reactance XL12, resistance RL13With reactance XL13It is sequentially connected by wire, reactance XL13It is connected with cyclization switch
It connects；4th section of feed line impedance includes reactance XL21With resistance RL21, the 5th section of feed line impedance include reactance XL122With resistance RL22, the
Six sections of feed line impedances include reactance XL23With resistance RL23, the second main transformer equivalent reactance XT2, resistance RL21, reactance XL21, resistance RL22、
Reactance XL122, resistance RL23With reactance XL23It is sequentially connected by wire, reactance XL23It is connected with cyclization switch.
3. closed loop network according to claim 2 falls load circuit, which is characterized in that the first main transformer equivalent impedance
XT1Output end voltage be first line busbar voltage U1, the initial current into first segment feed line impedance is I10, initial electricity
Flow I10Power factor be cos φ1；The second main transformer equivalent impedance XT2Output end voltage be the second circuit busbar voltage
U2, the initial current into the 4th section of feed line impedance is I20, initial current I20Power factor be cos φ2。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721755580.0U CN207518269U (en) | 2017-12-15 | 2017-12-15 | A kind of closed loop network falls load circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721755580.0U CN207518269U (en) | 2017-12-15 | 2017-12-15 | A kind of closed loop network falls load circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107887913A (en) * | 2017-12-15 | 2018-04-06 | 国网河南省电力公司濮阳供电公司 | A kind of closed loop network falls load circuit and tidal current analysis method |
-
2017
- 2017-12-15 CN CN201721755580.0U patent/CN207518269U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107887913A (en) * | 2017-12-15 | 2018-04-06 | 国网河南省电力公司濮阳供电公司 | A kind of closed loop network falls load circuit and tidal current analysis method |
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