CN206850414U - A kind of power distribution network feedback of earthing mode self-identifying supplies line protective devices - Google Patents
A kind of power distribution network feedback of earthing mode self-identifying supplies line protective devices Download PDFInfo
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- CN206850414U CN206850414U CN201720728363.6U CN201720728363U CN206850414U CN 206850414 U CN206850414 U CN 206850414U CN 201720728363 U CN201720728363 U CN 201720728363U CN 206850414 U CN206850414 U CN 206850414U
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Abstract
The utility model discloses a kind of feedback of the power distribution network of earthing mode self-identifying to supply line protective devices, wherein, including：Acquisition Circuit, the Acquisition Circuit are used for the electric measure feature for gathering current line respectively, wherein, the electrically measure feature includes current zero-sequence current and current residual voltage；Decision circuitry, judge whether the earthing mode of the current line is Neutral Point Through Low Resistance mode for the electrically measure feature in current line；Zero-sequencedirectional protection circuit, for when the current line earthing mode for it is described in Neutral Point Through Low Resistance mode when, start zero-sequencedirectional protection and output control signal be to control the switch-off of the current line.The power distribution network feedback of earthing mode self-identifying provided by the utility model is solved the problems, such as to present power distribution network when earthing mode changes and protected for circuit for line protective devices.
Description
Technical field
It the utility model is related to field of relay protection in power, more particularly to a kind of power distribution network of earthing mode self-identifying
Feedback supplies line protective devices.
Background technology
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
During failure, isolated neutral system or failure need not be cut off through arc suppression coil system, can continued to run with 1.5 to 2 hours, and
Neutral Point Through Low Resistance system need to cut off failure immediately, otherwise small resistor device will be caused to burn.
Current isolated neutral system or compensated distribution network feedback supplies route protection generally use three-stage
Overcurrent protection, Neutral Point Through Low Resistance system generally use three-step charging and two-part zero-sequenceprotection, circuit
Single-phase fault protection is realized by zero-sequenceprotection.Preset due to presenting for route protection function, if power system operating mode change is made
Changed into system earth mode, then feedback for route protection can not adjust automatically, following consequence may be caused：First, distribution
Net earthing mode is changed to through small resistance grounding system, then occur single by isolated neutral system or compensated distribution network
Phase earth fault rear feed can not be acted for route protection, and failure will be cut off by back-up protection, and failure removal scope expands, during excision
Between it is elongated, be unfavorable for power supply reliability and equipment safety；Secondly, Grounding Mode of Distribution Network is by Neutral Point Through Low Resistance system
Isolated neutral system or compensated distribution network are changed to, then zero-sequence current protection can after singlephase earth fault occurring
Energy malfunction, the situation for causing to continue to run with originally trip, and are unfavorable for distribution network reliability.
As shown in figure 1, normal operating mode A stations and B stations independent operating, A stations are neutral by arc extinction coil grounding system,
Feedback is not tripped for route protection single-phase fault；B stations are Neutral Point Through Low Resistance system, and feedback supplies route protection single-phase fault zero
Sequence overcurrent protection action tripping operation.It is power supply point band A station statements based on collusion operations when the method for operation is adjusted to B stations, if A station tracks road (such as A1
Line) singlephase earth fault occurs, then A1 lines feedback can not act excision failure for line protective devices, and delay is switched into feedback by B1 supplies
Route protection cuts off failure.Quick excision failure can be so switched by A1 originally, as a result needs B1 switches through prolonging for a period of time
Shi Fangke cuts off failure, and power failure range also expands therewith, and all circuits in A stations can be caused to lose power outage, have a strong impact on that A stands
Power supply reliability.
Therefore, how to carry out protection for circuit to power distribution network feedback when earthing mode changes turns into urgently to be resolved hurrily
Technical problem.
The content of the invention
The utility model is intended at least solve one of technical problem present in prior art, there is provided a kind of earthing mode is certainly
The power distribution network feedback of identification supplies line protective devices, to solve the problems of the prior art.
As one side of the present utility model, there is provided a kind of power distribution network feedback of earthing mode self-identifying fills for route protection
Put, wherein, the power distribution network feedback of the earthing mode self-identifying includes for line protective devices：
Acquisition Circuit, the Acquisition Circuit are used for the electric measure feature for gathering current line respectively, wherein, the electrical quantity
Feature includes current zero-sequence current and current residual voltage；
Decision circuitry, the decision circuitry are connected with the Acquisition Circuit, for described electric in current line
Measure feature judges whether the earthing mode of the current line is Neutral Point Through Low Resistance mode；
Zero-sequencedirectional protection circuit, the zero-sequencedirectional protection circuit are connected with the decision circuitry, for working as when described
The earthing mode of preceding circuit, in Neutral Point Through Low Resistance mode, starts zero-sequencedirectional protection and output control letter to be described
Number to control the switch-off of the current line.
Preferably, the decision circuitry includes：Zero-sequence current value decision circuitry,
The zero-sequence current value decision circuitry is used to judge whether the current zero-sequence current is more than first threshold, when described
When current zero-sequence current is more than first threshold, the earthing mode for determining current line is the Neutral Point Through Low Resistance side
Formula.
Preferably, the first threshold is 10A.
Preferably, the decision circuitry includes：Zero-sequence current phase decision circuitry,
The zero-sequence current phase decision circuitry is used to judge the current zero-sequence current and the current residual voltage
Phase relation, when the current zero-sequence current is with the current residual voltage same-phase, determine the mode of connection of current line
For the Neutral Point Through Low Resistance mode.
Preferably, the zero-sequencedirectional protection circuit includes overcurrent protection start-up circuit and output control circuit,
The overcurrent protection start-up circuit is used to, when the current zero-sequence current is more than and starts zero-sequenceprotection value, start institute
State zero-sequencedirectional protection and send output signal；
The output control circuit is connected with the overcurrent protection start-up circuit, is controlled for being exported according to the output signal
Signal processed is to control the switch-off of the current line.
The power distribution network feedback of earthing mode self-identifying provided by the utility model supplies line protective devices, is adopted by Acquisition Circuit
Collect the current zero-sequence current of current circuit and current residual voltage, decision circuitry is according to current zero-sequence current and current zero sequence electricity
Pressure judges whether the earthing mode of current circuit is Neutral Point Through Low Resistance mode, when for Neutral Point Through Low Resistance
During mode, zero-sequencedirectional protection circuit start zero-sequencedirectional protection function, pass through this protection device provided by the utility model
Then corresponding zero sequence electricity can be carried out according to earthing mode according to the earthing mode of electrical quantity Automatic feature recognition power network line
Stream protection, solve the problems, such as to present power distribution network when earthing mode changes and protected for circuit.
Brief description of the drawings
Accompanying drawing is to be further understood for providing to of the present utility model, and a part for constitution instruction, and following
Embodiment be used to explain the utility model together, but do not form to limitation of the present utility model.In the accompanying drawings：
Fig. 1 is the line-to-ground schematic diagram of prior art.
Fig. 2 is structural representation of the power distribution network feedback for line protective devices of earthing mode self-identifying provided by the utility model
Figure.
Fig. 3 is that zero-sequenceprotection provided by the utility model enables area's schematic diagram.
Fig. 4 is operation principle of the power distribution network feedback for line protective devices of earthing mode self-identifying provided by the utility model
Figure.
Fig. 5 is that the power distribution network feedback of earthing mode self-identifying provided by the utility model supplies line protection method flow chart.
Embodiment
Specific embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.It should be appreciated that herein
Described embodiment is merely to illustrate and explained the utility model, is not limited to the utility model.
As one side of the present utility model, there is provided a kind of power distribution network feedback of earthing mode self-identifying supplies route protection
Device, as shown in Fig. 2 wherein, the power distribution network feedback of the earthing mode self-identifying includes for line protective devices 10：
Acquisition Circuit 100, the Acquisition Circuit 100 are used for the electric measure feature for gathering current line respectively, wherein, it is described
Electric measure feature includes current zero-sequence current and current residual voltage；
Decision circuitry 110, the decision circuitry 110 is connected with the Acquisition Circuit 100, for according in current line
The electrically measure feature judges whether the earthing mode of the current line is Neutral Point Through Low Resistance mode；
Zero-sequencedirectional protection circuit 120, the zero-sequencedirectional protection circuit 120 are connected with the decision circuitry 110, are used for
When the current line earthing mode for it is described in Neutral Point Through Low Resistance mode when, it is simultaneously defeated to start zero-sequencedirectional protection
Go out control signal to control the switch-off of the current line.
The power distribution network feedback of earthing mode self-identifying provided by the utility model supplies line protective devices, is adopted by Acquisition Circuit
Collect the current zero-sequence current of current circuit and current residual voltage, decision circuitry is according to current zero-sequence current and current zero sequence electricity
Pressure judges whether the earthing mode of current circuit is Neutral Point Through Low Resistance mode, when for Neutral Point Through Low Resistance
During mode, zero-sequencedirectional protection circuit start zero-sequencedirectional protection function, pass through this protection device provided by the utility model
Then corresponding zero sequence electricity can be carried out according to earthing mode according to the earthing mode of electrical quantity Automatic feature recognition power network line
Stream protection, solve the problems, such as to present power distribution network when earthing mode changes and protected for circuit.
As a kind of embodiment of the decision circuitry 110, the decision circuitry 110 includes：Zero-sequence current value
Decision circuitry, the zero-sequence current value decision circuitry are used to judge whether the current zero-sequence current is more than first threshold, work as institute
When stating current zero-sequence current and being more than first threshold, the earthing mode for determining current line is the Neutral Point Through Low Resistance side
Formula.
Specifically, neutral grounding mode non-fault line zero-sequence current is generally smaller, and faulty line zero-sequence current is usual
Larger, but typically not greater than described first threshold, otherwise code regulation need to be changed to neutral by arc extinction coil grounding system, neutral
Through faulty line zero-sequence current very little under grounding through arc mode single-phase fault, (neutral point is operated in and skipped over point through arc suppression coil
Under compensating coefficient), non-fault line zero-sequence current value is not known under neutral by arc extinction coil grounding mode single-phase fault, is led to
It is often smaller, usually more than neutral point through arc suppression coil rated current, under Neutral Point Through Low Resistance mode zero-sequence current compared with
Greatly.
Preferably, the first threshold is 10A.
As the decision circuitry 110 another, specifically embodiment, the decision circuitry 110 include：Zero sequence electricity
Phase decision circuitry is flowed, the zero-sequence current phase decision circuitry is used to judge the current zero-sequence current and the current zero sequence
The phase relation of voltage, when the current zero-sequence current is with the current residual voltage same-phase, determine connecing for current line
Line mode is the Neutral Point Through Low Resistance mode.
Specifically, faulty line zero-sequence current lags about 90 ° of residual voltage under isolated neutral mode single-phase fault, non-
About 90 ° of the advanced residual voltage of faulty line zero-sequence current；Neutral by arc extinction coil grounding mode faulty line, non-fault line
It is about 90 ° of the advanced residual voltage of zero-sequence current；Neutral Point Through Low Resistance system zero-sequence current and residual voltage same-phase.
As the embodiment of the zero-sequencedirectional protection circuit, the zero-sequencedirectional protection circuit 120 included
Stream protection start-up circuit and output control circuit, the overcurrent protection start-up circuit are used to open when the current zero-sequence current is more than
During dynamic zero-sequenceprotection value, start the zero-sequencedirectional protection and send output signal；The output control circuit and the excessively stream
Start-up circuit connection is protected, for controlling the pass of the switch of the current line according to the output signal output control signal
It is disconnected.
It should be noted that for the reliability of enhancement line, generally in the zero-sequencedirectional protection circuit 120 and switch
Outlet loop is directly set, and the outlet loop can strengthen antijamming capability of the feedback for circuit, so as to improve feedback for circuit
Reliability.
It should also be noted that, the zero-sequencedirectional protection circuit 120 generally also 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
Transport at the switch of the current line, so as to control the switch-off.
As the embodiment of the overcurrent protection start-up circuit, described in when opening the zero-sequencedirectional protection
Zero-sequence current need to meet following conditions：
(1) I0＞ Iqdh,
Wherein, I0For the zero-sequence current, IqdhFor the startup zero-sequenceprotection value, IqdhValue selection in described
The property earth-free mode of point typically takes 15A, and 1.05 times of arc suppression coils are typically taken for the neutral by arc extinction coil grounding mode
Rated current.If a variety of possible methods of operation in power network be present, according to 1.05 times of maximum capacity arc suppression coil rated current
Choose.
(2) I0＞ I0ezdAnd
Wherein, I0For the zero-sequence current, I0ezdRoute protection is supplied for feedback under the Neutral Point Through Low Resistance mode most
End zero-sequenceprotection value, U0For the residual voltage.It is as shown in Figure 3 that corresponding zero-sequenceprotection enables area.
In addition, it is illustrated in figure 4 operation principle of the power distribution network feedback for line protective devices of the earthing mode self-identifying
Figure, when the earthing mode of the current line changes, can judge earthing mode so that it is determined that zero sequence by predetermined condition
The input of protection is with exiting.
Specifically, as shown in figure 4, three-stage overcurrent protection is put into by field demand, if phase fault event occurs
Barrier, then protect excision failure with three-stage overcurrent；Zero-sequenceprotection can select fixed input or adaptive input：
(1) fixed input, be Neutral Point Through Low Resistance mode for the earthing mode, after generation single-phase fault zero-sequenceprotection move
Make excision failure；(2) adaptive input, then after single-phase fault occurring, the power distribution network feedback of the earthing mode self-identifying supplies circuit
Protection device carries out earthing mode identification automatically, and zero-sequenceprotection is automatically engaged if Neutral Point Through Low Resistance mode is identified as
Cut off failure, if isolated neutral mode or neutral by arc extinction coil grounding mode is identified as zero-sequenceprotection do not throw
Enter.
As second of the present utility model aspect, as shown in Figure 5, there is provided a kind of feedback of the power distribution network of earthing mode self-identifying
For line protection method, wherein, the power distribution network feedback of the earthing mode self-identifying includes for line protection method：
S110, the electric measure feature for gathering current line respectively, wherein, the electrically measure feature includes current zero-sequence current
With current residual voltage；
S120, the electrically measure feature in current line judge the current line earthing mode whether be
Property point is through low resistance grounding mode；
S130, when the current line earthing mode for it is described in Neutral Point Through Low Resistance mode when, start zero
Sequence overcurrent protection and output control signal are to control the switch-off of the current line.
The power distribution network feedback of earthing mode self-identifying provided by the utility model supplies line protection method, current by collecting
The current zero-sequence current and current residual voltage of circuit, judge current circuit according to current zero-sequence current and current residual voltage
Earthing mode whether be Neutral Point Through Low Resistance mode, when for Neutral Point Through Low Resistance mode when, start zero sequence
Overcurrent protection function, can be according to electrical quantity Automatic feature recognition grid line by this guard method provided by the utility model
The earthing mode on road, corresponding zero-sequence current protection is then carried out according to earthing mode, solved when earthing mode changes
The problem of Shi Buneng protects to power distribution network feedback for circuit.
As a kind of specifically embodiment, the electrically measure feature in current line judges described current
The step of whether earthing mode of circuit is Neutral Point Through Low Resistance mode includes：
Judge whether the current zero-sequence current is more than first threshold, when the current zero-sequence current is more than first threshold
When, the earthing mode for determining current line is the Neutral Point Through Low Resistance mode.
As another specifically embodiment, the electrically measure feature in current line judges described work as
The step of whether earthing mode of preceding circuit is Neutral Point Through Low Resistance mode includes：
Judge the phase relation of the current zero-sequence current and the current residual voltage, when the current zero-sequence current with
During the current residual voltage same-phase, the mode of connection for determining current line is the Neutral Point Through Low Resistance mode.
Specifically, the earthing mode when the current line for it is described in Neutral Point Through Low Resistance mode when,
Start zero-sequencedirectional protection and output control signal is included with controlling the step of the switch-off of the current line：
When the current zero-sequence current, which is more than, starts zero-sequenceprotection value, starts the zero-sequencedirectional protection and send output
Signal；
According to the output signal output control signal to control the switch-off of the current line.
Power distribution network feedback on earthing mode self-identifying is referred to above for the embodiment of line protection method
In on earthing mode self-identifying power distribution network feedback for line protective devices description, here is omitted.
It is understood that embodiment of above is merely to illustrate that principle of the present utility model and used exemplary
Embodiment, but the utility model is not limited thereto.For those skilled in the art, this is not being departed from
In the case of the spirit and essence of utility model, various changes and modifications can be made therein, and these variations and modifications are also considered as this reality
With new protection domain.
Claims (5)
1. a kind of power distribution network feedback of earthing mode self-identifying supplies line protective devices, it is characterised in that the earthing mode is known certainly
Other power distribution network feedback includes for line protective devices：
Acquisition Circuit, the Acquisition Circuit are used for the electric measure feature for gathering current line respectively, wherein, the electric measure feature
Including current zero-sequence current and current residual voltage；
Decision circuitry, the decision circuitry are connected with the Acquisition Circuit, special for the electrical quantity in current line
Sign judges whether the earthing mode of the current line is Neutral Point Through Low Resistance mode；
Zero-sequencedirectional protection circuit, the zero-sequencedirectional protection circuit are connected with the decision circuitry, for working as front when described
The earthing mode on road to be described in Neutral Point Through Low Resistance mode, start zero-sequencedirectional protection and output control signal with
Control the switch-off of the current line.
2. the power distribution network feedback of earthing mode self-identifying according to claim 1 supplies line protective devices, it is characterised in that institute
Stating decision circuitry includes：Zero-sequence current value decision circuitry
The zero-sequence current value decision circuitry is used to judge whether the current zero-sequence current is more than first threshold, when described current
When zero-sequence current is more than first threshold, the earthing mode for determining current line is the Neutral Point Through Low Resistance mode.
3. the power distribution network feedback of earthing mode self-identifying according to claim 2 supplies line protective devices, it is characterised in that institute
It is 10A to state first threshold.
4. the power distribution network feedback of earthing mode self-identifying according to claim 1 supplies line protective devices, it is characterised in that institute
Stating decision circuitry includes：Zero-sequence current phase decision circuitry,
The zero-sequence current phase decision circuitry is used for the phase for judging the current zero-sequence current and the current residual voltage
Relation, when the current zero-sequence current is with the current residual voltage same-phase, the mode of connection for determining current line is institute
State Neutral Point Through Low Resistance mode.
5. the power distribution network feedback of earthing mode self-identifying according to claim 1 supplies line protective devices, it is characterised in that institute
Stating zero-sequencedirectional protection circuit includes overcurrent protection start-up circuit and output control circuit,
The overcurrent protection start-up circuit is used to, when the current zero-sequence current is more than and starts zero-sequenceprotection value, start described zero
Sequence overcurrent protection simultaneously sends output signal；
The output control circuit is connected with the overcurrent protection start-up circuit, for being believed according to the output signal output control
Number to control the switch-off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720728363.6U CN206850414U (en) | 2017-06-20 | 2017-06-20 | A kind of power distribution network feedback of earthing mode self-identifying supplies line protective devices |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720728363.6U CN206850414U (en) | 2017-06-20 | 2017-06-20 | A kind of power distribution network feedback of earthing mode self-identifying supplies line protective devices |
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| Publication Number | Publication Date |
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| CN206850414U true CN206850414U (en) | 2018-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720728363.6U Withdrawn - After Issue CN206850414U (en) | 2017-06-20 | 2017-06-20 | A kind of power distribution network feedback of earthing mode self-identifying supplies line protective devices |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107192919A (en) * | 2017-06-20 | 2017-09-22 | 国网江苏省电力公司无锡供电公司 | A kind of power distribution network feedback of earthing mode self-identifying supplies line protective devices and method |
-
2017
- 2017-06-20 CN CN201720728363.6U patent/CN206850414U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107192919A (en) * | 2017-06-20 | 2017-09-22 | 国网江苏省电力公司无锡供电公司 | A kind of power distribution network feedback of earthing mode self-identifying supplies line protective devices and method |
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