CN107204609B - A kind of the power distribution network busbar protective device and method of earthing mode self-identifying - Google Patents
A kind of the power distribution network busbar protective device and method of earthing mode self-identifying Download PDFInfo
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- CN107204609B CN107204609B CN201710473344.8A CN201710473344A CN107204609B CN 107204609 B CN107204609 B CN 107204609B CN 201710473344 A CN201710473344 A CN 201710473344A CN 107204609 B CN107204609 B CN 107204609B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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Abstract
The invention discloses a kind of power distribution network busbar protective devices of earthing mode self-identifying; wherein, comprising: Acquisition Circuit, for acquiring the electrical measure feature of current two buss lines respectively; wherein, electrical measure feature includes current bus zero sequence difference current and current bus residual voltage；Decision circuitry, for judging whether the earthing mode of current two buss lines is Neutral Point Through Low Resistance mode according to the electrical measure feature in current two buss lines；Zero sequence differential protection circuit, for when the earthing mode of the current two buss lines is, in Neutral Point Through Low Resistance mode, starting zero sequence differential protection exports control signal simultaneously to control the switch-off of current two buss lines.The invention also discloses a kind of power distribution network bus bar protecting methods of earthing mode self-identifying.The power distribution network busbar protective device of earthing mode self-identifying provided by the invention solves the problems, such as to protect power distribution network bus when earthing mode changes.
Description
Technical field
The present invention relates to field of relay protection in power more particularly to a kind of power distribution network buses of earthing mode self-identifying
Protective device and a kind of power distribution network bus bar protecting method of earthing mode self-identifying.
Background technique
Medium voltage distribution network earthing mode uses isolated neutral generally according to the difference of earthing capacitance current size at present
System, neutral by arc extinction coil grounding system or Neutral Point Through Low Resistance system.When single-phase earthing occurs for distribution line
When failure, isolated neutral system or through arc suppression coil system without cutting off failure, can continue to run 1.5 to 2 hours, and
Neutral Point Through Low Resistance system need to cut off failure immediately, otherwise small resistance device will be caused to burn.
Bus protection generallys use phase segregated differential protection principle, any phase after grid collapses in the institute of current power distribution website
Not poor stream is more than that definite value then cuts off failure, and can bring following problems in this way:
(1) Neutral Point Through Low Resistance system usually limits earth current due to the presence of grounding resistor
In a reduced levels, therefore for phase segregated differential protection, to realize under small current neutral grounding system to the protection of single-phase fault,
Need to reduce phase segregated differential protection definite value, this will bring risk, a certain heavy load route to bus differential protecting reliability service
Situations such as current transformer (CT) breaks may cause false protection.
(2) bus protection can not automatic identification Grounding Mode of Distribution Network, if earthing mode by isolated neutral system or
Compensated distribution network is changed to through small resistance grounding system, then can not reduce phase segregated differential protection definite value automatically, cause mother
Bus relay fail after single-phase earthing occurs for line；It is not connect if earthing mode is changed to neutral point by Neutral Point Through Low Resistance system
Ground system or compensated distribution network can not then improve phase segregated differential protection definite value automatically, reduce operation risk.
(3) some power distribution station two sections of buses may be powered by the different substation of two earthing modes, bus protection is logical
It often is only capable of that a set of split-phase differential action definite value is arranged, be unfavorable for realizing under different earthing modes for differentiation under single-phase earthing
The means of relay protection.
Bus protection generallys use difference in current isolated neutral system or compensated distribution network station institute
Dynamic protection philosophy, as shown in Figure 1, the station normal operating mode A and the station B independent operating, the station A is neutral by arc extinction coil grounding system
System, bus phase segregated differential protection definite value is higher, and bus single-phase fault does not trip；The station B is Neutral Point Through Low Resistance system, female
Line phase segregated differential protection definite value is lower, the movement tripping of bus single-phase fault phase segregated differential protection.It is when the method for operation is adjusted to the station B
Power supply point band A station statements based on collusion operation, if singlephase earth fault occurs for the station A bus, the station A busbar protective device can not act immediately to be cut
Except failure, it will be delayed and excision failure is protected by B1 switching circuit.Can be stood switch quickly excision failure by A originally in this way, knot
Fruit needs B1 switch that can cut off failure through a period of time delay, and scope of power outage also expands therewith, and bus-bar fault is usually in the station A
Master-failure, mute time are obvious elongated very unfavorable for equipment safety.
Therefore, how to carry out protection to power distribution network bus when earthing mode changes becomes skill urgently to be resolved
Art problem.
Summary of the invention
The present invention is directed at least solve one of the technical problems existing in the prior art, a kind of earthing mode self-identifying is provided
Power distribution network busbar protective device and a kind of power distribution network bus bar protecting method of earthing mode self-identifying, with solve in the prior art
The problem of.
As the first aspect of the invention, a kind of power distribution network busbar protective device of earthing mode self-identifying is provided,
In, the power distribution network busbar protective device of the earthing mode self-identifying includes:
Acquisition Circuit, the Acquisition Circuit are used to acquire the electrical measure feature of current two buss lines respectively, wherein the electricity
Tolerance feature includes current bus zero sequence difference current and current bus residual voltage；
Decision circuitry, the decision circuitry are connect with the Acquisition Circuit, for according in current two buss lines
Electrical measure feature judges whether the earthing mode of the current two buss lines is Neutral Point Through Low Resistance mode；
Zero sequence differential protection circuit, the zero sequence differential protection circuit are connect with the decision circuitry, for working as when described
The earthing mode of preceding two buss lines is described in Neutral Point Through Low Resistance mode, starts zero sequence differential protection and exports control
Signal processed is to control the switch-offs of the current two buss lines.
Preferably, the decision circuitry includes: zero sequence differential current value decision circuitry,
The zero sequence differential current value decision circuitry is for judging whether the current bus zero sequence difference current is greater than the
One threshold value determines that the earthing mode of current two buss lines is when the current bus zero sequence difference current is greater than first threshold
The Neutral Point Through Low Resistance mode.
Preferably, the first threshold is 10A.
Preferably, the decision circuitry includes: zero sequence difference current phase decision circuitry,
The zero sequence difference current phase decision circuitry is for judging that the current bus zero sequence difference current is worked as with described
The phase relation of preceding bus residual voltage, when the current bus zero sequence difference current and the current same phase of bus residual voltage
When position, determine that the mode of connection of current two buss lines is the Neutral Point Through Low Resistance mode.
Preferably, the zero sequence differential protection circuit includes zero sequence differential protection start-up circuit and output control circuit,
The zero sequence differential protection start-up circuit is used for when the current bus zero sequence difference current is poor greater than starting zero sequence
When dynamic protection value, starts the zero sequence differential protection and issue output signal；
The output control circuit is connect with the zero sequence differential protection start-up circuit, for defeated according to the output signal
Control signal out to control the switch-off of the current two buss lines.
As the second aspect of the invention, a kind of power distribution network bus bar protecting method of earthing mode self-identifying is provided,
In, the power distribution network bus bar protecting method of the earthing mode self-identifying includes:
The electrical measure feature of current two buss lines is acquired respectively, wherein the electrical measure feature includes current bus zero sequence
Difference current and current bus residual voltage；
According to the electrical measure feature in current two buss lines judge the current two buss lines earthing mode whether
For Neutral Point Through Low Resistance mode；
When the earthing mode of the current two buss lines be it is described in Neutral Point Through Low Resistance mode, start zero sequence
Differential protection simultaneously exports control signal to control the switch-off of the current two buss lines.
Preferably, the electrical measure feature in the current two buss lines of the basis judges connecing for the current two buss lines
The step of whether ground mode is Neutral Point Through Low Resistance mode include:
Judge whether the current bus zero sequence difference current is greater than first threshold, when the current differential electricity of bus zero sequence
When stream is greater than first threshold, determine that the earthing mode of current two buss lines is the Neutral Point Through Low Resistance mode.
Preferably, the electrical measure feature in the current two buss lines of the basis judges connecing for the current two buss lines
The step of whether ground mode is Neutral Point Through Low Resistance mode include:
The phase relation for judging the current bus zero sequence difference current and the current bus residual voltage, works as when described
When preceding bus zero sequence difference current and the current bus residual voltage same-phase, determine that the mode of connection of current two buss lines is
The Neutral Point Through Low Resistance mode.
Preferably, described when the earthing mode of the current two buss lines is described in Neutral Point Through Low Resistance mode
When, the step of starting zero sequence differential protection and exporting control switch-off of the signal to control the current two buss lines packet
It includes:
When the current bus zero sequence difference current is greater than starting zero sequence differential protection value, start the differential guarantor of the zero sequence
It protects and issues output signal；
Control signal is exported according to the output signal to control the switch-off of the current two buss lines.
The power distribution network busbar protective device of earthing mode self-identifying provided by the invention, is collected currently by Acquisition Circuit
Bus zero sequence difference current and current bus residual voltage, decision circuitry is according to current bus zero sequence difference current and current bus
Residual voltage judges whether the earthing mode of current line is Neutral Point Through Low Resistance mode, when being neutral point through small electricity
When hindering earthing mode, zero sequence differential protection circuit start zero sequence differential protection function, this protection dress provided through the invention
Then setting can carry out corresponding according to the earthing mode of the current two buss lines of electrical quantity Automatic feature recognition according to earthing mode
Zero sequence differential protection solves the problems, such as to protect two buss lines when earthing mode changes.
Detailed description of the invention
The drawings are intended to provide a further understanding of the invention, and constitutes part of specification, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the line-to-ground schematic diagram of the prior art.
Fig. 2 is the structural schematic diagram of the power distribution network busbar protective device of earthing mode self-identifying provided by the invention.
Fig. 3 is that zero-sequenceprotection provided by the invention enables area's schematic diagram.
Fig. 4 is distribution website institute provided by the invention main wiring diagram.
Fig. 5 is the working principle diagram of the power distribution network busbar protective device of earthing mode self-identifying provided by the invention.
Fig. 6 is the power distribution network bus bar protecting method flow chart of earthing mode self-identifying provided by the invention.
Specific embodiment
Below in conjunction with attached drawing, detailed description of the preferred embodiments.It should be understood that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
As the first aspect of the invention, a kind of power distribution network busbar protective device of earthing mode self-identifying is provided, such as
Shown in Fig. 2, wherein the power distribution network busbar protective device 10 of the earthing mode self-identifying includes:
Acquisition Circuit 100, the Acquisition Circuit 100 are used to acquire the electrical measure feature of current two buss lines respectively, wherein
The electrical measure feature includes current bus zero sequence difference current and current bus residual voltage；
Decision circuitry 110, the decision circuitry 110 are connect with the Acquisition Circuit 100, for according to current two buss lines
In the electrical measure feature judge whether the earthing mode of the current two buss lines is Neutral Point Through Low Resistance mode；
Zero sequence differential protection circuit 120, the zero sequence differential protection circuit 120 connect with the decision circuitry 110, are used for
When the earthing mode of the current two buss lines be it is described in Neutral Point Through Low Resistance mode, start zero sequence differential protection
And control signal is exported to control the switch-off of the current two buss lines.
The power distribution network busbar protective device of earthing mode self-identifying provided by the invention, is collected currently by Acquisition Circuit
Bus zero sequence difference current and current bus residual voltage, decision circuitry is according to current bus zero sequence difference current and current bus
Residual voltage judges whether the earthing mode of current line is Neutral Point Through Low Resistance mode, when being neutral point through small electricity
When hindering earthing mode, zero sequence differential protection circuit start zero sequence differential protection function, this protection dress provided through the invention
Then setting can carry out corresponding according to the earthing mode of the current two buss lines of electrical quantity Automatic feature recognition according to earthing mode
Zero sequence differential protection solves the problems, such as to protect two buss lines when earthing mode changes.
As a kind of specific embodiment of the decision circuitry 110, the decision circuitry 110 includes: the differential electricity of zero sequence
Flow valuve decision circuitry, the zero sequence differential current value decision circuitry is for judging whether the current bus zero sequence difference current is big
The ground connection side of current two buss lines is determined when the current bus zero sequence difference current is greater than first threshold in first threshold
Formula is the Neutral Point Through Low Resistance mode.
Specifically, neutral grounding mode fault bus zero sequence difference current is usually larger, but typically not greater than described
One threshold value, otherwise regulation regulation need to be changed to neutral by arc extinction coil grounding system, neutral by arc extinction coil grounding mode list
Fault bus zero sequence difference current very little (neutral point is operated in through arc suppression coil and skipped under compensating coefficient), neutral point under phase fault
There is no zero sequence difference current, Neutral Point Through Low Resistance mode through non-faulting bus under grounding through arc mode single-phase fault
Lower fault bus zero sequence difference current is larger.
Preferably, the first threshold is 10A.
As the decision circuitry 110 another, specifically embodiment, the decision circuitry 110 include: that zero sequence is poor
Streaming current phase decision circuitry, the zero sequence difference current phase decision circuitry is for judging the current differential electricity of bus zero sequence
The phase relation of stream and the current bus residual voltage, when the current bus zero sequence difference current and the current bus zero
When sequence voltage same-phase, determine that the mode of connection of current two buss lines is the Neutral Point Through Low Resistance mode.
Specifically, fault bus zero sequence difference current lags bus residual voltage under isolated neutral mode single-phase fault
About 90 °, non-faulting bus does not have zero sequence difference current；Neutral by arc extinction coil grounding mode fault bus zero sequence difference current
Advanced about 90 ° of bus residual voltage, non-faulting bus does not have zero sequence difference current；The Neutral Point Through Low Resistance system failure is female
Line zero sequence difference current and residual voltage same-phase.
As the specific embodiment of the zero sequence differential protection circuit 120, the zero sequence differential protection circuit 120 includes
Zero sequence differential protection start-up circuit and output control circuit, the zero sequence differential protection start-up circuit are used to work as the current bus
When zero sequence difference current is greater than starting zero sequence differential protection value, starts the zero sequence differential protection and issue output signal；It is described
Output control circuit is connect with the zero sequence differential protection start-up circuit, for according to the output signal export control signal with
Control the switch-off of the current two buss lines.
It should be noted that for the reliability of enhancement line, usually in the zero sequence differential protection circuit 120 and switch
Outlet loop is directly set, and the outlet loop can enhance feedback for the anti-interference ability of route, to improve feedback for route
Reliability.
It should also be noted that, the zero sequence differential protection circuit 120 also typically includes relay, the output control electricity
The control signal of road output can control the conducting of the relay, can pass the control signal after the relay conducting
It transports at the switch of the current two buss lines, to control the switch-off.
As the specific embodiment of the zero sequence differential protection start-up circuit, when opening the zero sequence differential protection
The zero sequence difference current need to meet following conditions:
(1)I10cd> Iqdh,
Wherein, I10cdFor the zero sequence difference current, IqdhFor the starting zero sequence differential protection value, IqdhValue selection
15A is generally taken for the isolated neutral mode, 1.05 are generally taken for the neutral by arc extinction coil grounding mode
Times arc suppression coil rated current.If there are a variety of possible methods of operation in power grid, according to 1.05 times of maximum capacity arc blowout wires
Rated current is enclosed to choose.
(2)I10cd> I0ezdAnd
Wherein, I10cdFor the zero sequence difference current, I0ezdFor the Neutral Point Through Low Resistance mode Down Highway route
Protect least significant end zero-sequenceprotection value, U0For the residual voltage.It is as shown in Figure 3 that corresponding zero sequence differential protection enables area.
In addition, being illustrated in figure 4 distribution website institute main wiring diagram, the busbar protective device of the earthing mode self-identifying is again
Connection relationship in distribution website institute main wiring diagram is as seen from Figure 4, wherein mother's I zero sequence differential protection operation equation are as follows:
Mother's II zero sequence differential protection operation equation are as follows:
I in above-mentioned formulai10For mother's I inlet wire zero-sequence current, Ii20For mother's II inlet wire zero-sequence current, If0For block switch zero sequence
Electric current, Ij0Mother's I j-th strip outlet zero-sequence current where device, m are mother's I outlet sum, Ik0Mother's II kth item where device goes out
Line zero-sequence current, n are mother's II outlet sum, IopoFor zero sequence differential protection initiation value, by escaping, maximum zero sequence out-of-balance current is whole
Fixed, S is restraint coefficient, and by the adjusting of external area error maximum zero sequence out-of-balance current is escaped, all electric currents are to flow into bus as pros
To.
After meeting above-mentioned formula, bus zero sequence differential protection function is acted, immediately no-delay tripping inlet wire and block switch
Or all switches (being selected according to site requirement) on fault bus.Such as mother's I failure, bus zero sequence differential protection function
All outlet switchs of company, institute on tripping No. 1 incoming switch, block switch and mother I after movement.
As shown in figure 5, the working principle diagram of the power distribution network busbar protective device for the earthing mode self-identifying, (with I mother
For, mother II is similar), earthing mode self-recognition function is set, it, can be with when the earthing mode of the current line changes
Earthing mode is judged by predetermined condition so that it is determined that the investment of zero-sequenceprotection with exit.
Specifically, as shown in figure 5, to improve power distribution network bus protection operational reliability and adaptability, in bus protection
Zero sequence differential protection is increased newly based on original phase segregated differential protection.Phase segregated differential protection definite value takes unified big under various earthing modes
Value, is only used for protecting all kinds of phase faults, singlephase earth fault is cut off by zero sequence differential protection.Zero sequence differential protection
It is arranged by bus section, busbar section, if block switch can be enabled respectively or be deactivated according to system earth mode in quartile.If block switch
In coincidence, two sections of zero sequence differential protection functions are all enabled if any enabling of two sections of bus zero sequence differential protections.
Further specifically, after system jam, which is protected, to be started, if meeting the differential operation equation of split-phase, protection is pressed
Predetermined set tripping I parent phase inductive switch；
After system jam, which is protected, to be started, if the differential fixed investment of mother's I zero sequence or the differential fixed investment of mother's II zero sequence
And block switch is in coincidence, while meeting mother's I zero sequence differential protection operation equation, then protection is answered by predetermined set tripping I parent phase
Switch；
It is through small through logic judgment if mother's I earthing mode adaptation function is put into after system jam, which is protected, to be started
Resistance earthing, while meeting mother's I zero sequence differential protection operation equation, then predetermined set tripping I parent phase inductive switch is pressed in protection.
As the second aspect of the invention, as shown in fig. 6, the power distribution network bus for providing a kind of earthing mode self-identifying is protected
Maintaining method, wherein the power distribution network bus bar protecting method of the earthing mode self-identifying includes:
S110, the electrical measure feature for acquiring current two buss lines respectively, wherein the electrical measure feature includes current bus
Zero sequence difference current and current bus residual voltage；
S120, the earthing mode that the current two buss lines are judged according to the electrical measure feature in current two buss lines
It whether is Neutral Point Through Low Resistance mode；
S130, when the earthing mode of the current two buss lines be it is described in Neutral Point Through Low Resistance mode, open
Dynamic zero sequence differential protection simultaneously exports control signal to control the switch-off of the current two buss lines.
The power distribution network bus bar protecting method of earthing mode self-identifying provided by the invention, by collecting working as current circuit
Preceding bus zero sequence difference current and current bus residual voltage, according to current bus zero sequence difference current and current bus zero sequence electricity
Pressure judges whether the earthing mode of current bus is Neutral Point Through Low Resistance mode, when for Neutral Point Through Low Resistance
When mode, start zero sequence differential protection function, this guard method provided through the invention can be according to electrical measure feature certainly
The earthing mode of dynamic identification power distribution network bus, then carries out corresponding zero sequence differential protection according to earthing mode, solving ought connect
The problem of ground mode cannot protect power distribution network bus when changing.
It is described according to the electrical measure feature judgement in current two buss lines as a kind of specifically embodiment
The step of whether earthing mode of current two buss lines is Neutral Point Through Low Resistance mode include:
Judge whether the current bus zero sequence difference current is greater than first threshold, when the current differential electricity of bus zero sequence
When stream is greater than first threshold, determine that the earthing mode of current two buss lines is the Neutral Point Through Low Resistance mode.
As another specifically embodiment, the electrical measure feature in the current two buss lines of basis judges institute
The step of whether earthing mode for stating current two buss lines is Neutral Point Through Low Resistance mode include:
The phase relation for judging the current bus zero sequence difference current and the current bus residual voltage, works as when described
When preceding bus zero sequence difference current and the current bus residual voltage same-phase, determine that the mode of connection of current two buss lines is
The Neutral Point Through Low Resistance mode.
It is understood that above two specifically embodiment, is the mode of connection for judging current two buss lines
Criterion can judge whether the mode of connection of current two buss lines is neutral point through small electricity by any one of the above criterion
Hinder earthing mode.
Specifically, described when the earthing mode of the current two buss lines is described in Neutral Point Through Low Resistance mode
When, the step of starting zero sequence differential protection and exporting control switch-off of the signal to control the current two buss lines packet
It includes:
When the current bus zero sequence difference current is greater than starting zero sequence differential protection value, start the differential guarantor of the zero sequence
It protects and issues output signal；
Control signal is exported according to the output signal to control the switch-off of the current two buss lines.
The specific embodiment of power distribution network bus bar protecting method about earthing mode self-identifying is referred to hereinbefore close
In the description of the power distribution network bus protection protective device of earthing mode self-identifying, details are not described herein again.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, however the present invention is not limited thereto.For those skilled in the art, essence of the invention is not being departed from
In the case where mind and essence, various changes and modifications can be made therein, these variations and modifications are also considered as protection scope of the present invention.
Claims (9)
1. a kind of power distribution network busbar protective device of earthing mode self-identifying, which is characterized in that the earthing mode self-identifying
Power distribution network busbar protective device includes:
Acquisition Circuit, the Acquisition Circuit are used to acquire the electrical measure feature of current two buss lines respectively, wherein the electrical quantity
Feature includes current bus zero sequence difference current and current bus residual voltage；
Decision circuitry, the decision circuitry are connect with the Acquisition Circuit, for according to described electrical in current two buss lines
Measure feature judges whether the earthing mode of the current two buss lines is Neutral Point Through Low Resistance mode；
Zero sequence differential protection circuit, the zero sequence differential protection circuit are connect with the decision circuitry, for working as the current mother
When the earthing mode of line route is the Neutral Point Through Low Resistance mode, starts zero sequence differential protection and export control signal
To control the switch-off of the current two buss lines.
2. the power distribution network busbar protective device of earthing mode self-identifying according to claim 1, which is characterized in that described to sentence
Deenergizing includes: zero sequence differential current value decision circuitry,
The zero sequence differential current value decision circuitry is for judging whether the current bus zero sequence difference current is greater than the first threshold
Value determines that the earthing mode of current two buss lines is described when the current bus zero sequence difference current is greater than first threshold
Neutral Point Through Low Resistance mode.
3. the power distribution network busbar protective device of earthing mode self-identifying according to claim 2, which is characterized in that described
One threshold value is 10A.
4. the power distribution network busbar protective device of earthing mode self-identifying according to claim 1, which is characterized in that described to sentence
Deenergizing includes: zero sequence difference current phase decision circuitry,
The zero sequence difference current phase decision circuitry is for judging the current bus zero sequence difference current and the current mother
The phase relation of line residual voltage, when the current bus zero sequence difference current and the current bus residual voltage same-phase
When, determine that the mode of connection of current two buss lines is the Neutral Point Through Low Resistance mode.
5. the power distribution network busbar protective device of earthing mode self-identifying according to claim 1, which is characterized in that described zero
Sequence differential protection circuit includes zero sequence differential protection start-up circuit and output control circuit,
The zero sequence differential protection start-up circuit is used to be greater than the starting differential guarantor of zero sequence when the current bus zero sequence difference current
When shield value, starts the zero sequence differential protection and issue output signal；
The output control circuit is connect with the zero sequence differential protection start-up circuit, is controlled for being exported according to the output signal
Signal processed is to control the switch-offs of the current two buss lines.
6. a kind of power distribution network bus bar protecting method of earthing mode self-identifying, which is characterized in that the earthing mode self-identifying
Power distribution network bus bar protecting method includes:
The electrical measure feature of current two buss lines is acquired respectively, wherein the electrical measure feature includes that current bus zero sequence is differential
Electric current and current bus residual voltage；
According to the electrical measure feature in current two buss lines judge the current two buss lines earthing mode whether be
Property point is through low resistance grounding mode；
When the earthing mode of the current two buss lines is the Neutral Point Through Low Resistance mode, start the differential guarantor of zero sequence
It protects and exports control signal to control the switch-off of the current two buss lines.
7. the power distribution network bus bar protecting method of earthing mode self-identifying according to claim 6, which is characterized in that described
Whether the earthing mode that the current two buss lines are judged according to the electrical measure feature in current two buss lines is neutral point warp
The step of low resistance grounding mode includes:
Judge whether the current bus zero sequence difference current is greater than first threshold, when the current bus zero sequence difference current is big
When first threshold, determine that the earthing mode of current two buss lines is the Neutral Point Through Low Resistance mode.
8. the power distribution network bus bar protecting method of earthing mode self-identifying according to claim 6, which is characterized in that described
Whether the earthing mode that the current two buss lines are judged according to the electrical measure feature in current two buss lines is neutral point warp
The step of low resistance grounding mode includes:
The phase relation for judging the current bus zero sequence difference current and the current bus residual voltage, as the current mother
When line zero sequence difference current and the current bus residual voltage same-phase, determine that the mode of connection of current two buss lines is described
Neutral Point Through Low Resistance mode.
9. the power distribution network bus bar protecting method of earthing mode self-identifying according to claim 6, which is characterized in that described to work as
The earthing mode of the current two buss lines is described in Neutral Point Through Low Resistance mode, and starting zero sequence differential protection is simultaneously
The step of output control switch-off of the signal to control the current two buss lines includes:
When the current bus zero sequence difference current is greater than starting zero sequence differential protection value, start the zero sequence differential protection simultaneously
Issue output signal；
Control signal is exported according to the output signal to control the switch-off of the current two buss lines.
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| CN201710473344.8A CN107204609B (en) | 2017-06-20 | 2017-06-20 | A kind of the power distribution network busbar protective device and method of earthing mode self-identifying |
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| CN201710473344.8A CN107204609B (en) | 2017-06-20 | 2017-06-20 | A kind of the power distribution network busbar protective device and method of earthing mode self-identifying |
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| CN110912093B (en) * | 2019-12-09 | 2021-03-02 | 国网江苏省电力有限公司镇江供电分公司 | Disconnection relay protection method for measuring matching of load side bus line voltage and spare power automatic switching |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102361321A (en) * | 2011-09-05 | 2012-02-22 | 四川省电力公司资阳公司 | 110/220 kV transformers' neutral point grounding via small reactance |
| CN103208788A (en) * | 2013-03-08 | 2013-07-17 | 李景禄 | Intelligent dynamic power distribution network neutral-point grounding method and complete device |
| CN105207184A (en) * | 2015-10-12 | 2015-12-30 | 国家电网公司 | Zero-sequence directional element for neutral point via-resistance grounding system |
| CN106655120A (en) * | 2016-11-30 | 2017-05-10 | 孙嘉宁 | Intelligent ground protection method and system for neutral point of power distribution network |
| CN206806991U (en) * | 2017-06-20 | 2017-12-26 | 国网江苏省电力公司无锡供电公司 | A kind of power distribution network busbar protective device of earthing mode self-identifying |
-
2017
- 2017-06-20 CN CN201710473344.8A patent/CN107204609B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102361321A (en) * | 2011-09-05 | 2012-02-22 | 四川省电力公司资阳公司 | 110/220 kV transformers' neutral point grounding via small reactance |
| CN103208788A (en) * | 2013-03-08 | 2013-07-17 | 李景禄 | Intelligent dynamic power distribution network neutral-point grounding method and complete device |
| CN105207184A (en) * | 2015-10-12 | 2015-12-30 | 国家电网公司 | Zero-sequence directional element for neutral point via-resistance grounding system |
| CN106655120A (en) * | 2016-11-30 | 2017-05-10 | 孙嘉宁 | Intelligent ground protection method and system for neutral point of power distribution network |
| CN206806991U (en) * | 2017-06-20 | 2017-12-26 | 国网江苏省电力公司无锡供电公司 | A kind of power distribution network busbar protective device of earthing mode self-identifying |
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