CN109245081A - A kind of residual voltage suppressing method based on neutral ground impedance optimal control - Google Patents
A kind of residual voltage suppressing method based on neutral ground impedance optimal control Download PDFInfo
- Publication number
- CN109245081A CN109245081A CN201811176189.4A CN201811176189A CN109245081A CN 109245081 A CN109245081 A CN 109245081A CN 201811176189 A CN201811176189 A CN 201811176189A CN 109245081 A CN109245081 A CN 109245081A
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- China
- Prior art keywords
- arc suppression
- ground
- suppression coil
- optimal control
- residual voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention relates to a kind of residual voltage suppressing methods based on neutral ground impedance optimal control, and detailed process is as follows: S11, to power distribution network, parameter carries out real-time measurement over the ground；S12, the parameter that arc suppression coil parallel resistance or series resistance are adjusted according to the parameter over the ground；Further, the parameter over the ground includes direct-to-ground capacitance and ratio of damping；Further, the specific practice of the step S11 is, when power grid operates normally, by arc suppression coil be tuned to the state far from resonance point, the size of real-time monitoring electric network capacitance and current, after single-phase earthing occurs for power grid, moment adjusts arc suppression coil and implements compensation；Host computer determines the corresponding transient state travelling wave signal detection sensor of fault feeder according to alarm type；The present invention has effective protection faulty circuit.Fault point is avoided the advantages of arc reignition occur.
Description
Technical field
The invention belongs to line fault detection technique fields, and in particular to a kind of power distribution network primary fault positioning and the pre- police
Method.
Background technique
Power distribution network be risen in power network it is important distribution electric energy effect network, generally by overhead transmission line, cable, shaft tower,
The compositions such as distribution transformer, disconnecting switch, reactive-load compensator and some affiliated facilities.Power distribution network, which usually has three, relatively joins
Number is asymmetric, the unbalanced situation of threephase load, causes the unbalanced problem of power distribution network three-phase output voltage, to electric system and
User brings a series of harm, for example, reducing the power output of distribution transformer, jeopardizes the safety of transformer；Capacity motor utilizes
Rate reduces；Grid loss increases；Power supply unit can not work normally, and influence the power supply reliability of distribution system.
In the related technology, the unbalanced method of three-phase output voltage is inhibited to have: 1, using manual switching capacitor or voltage
The method of device restores route three-phase voltage by putting into capacitor or reactor group in route capacitive unbalance to earth phase
Balance；2, the method for the change system earth mode being grounded using grounding through arc or cancellation coil series resistance, balance three
Phase voltage.However, using the method for manual switching capacitor or voltage device, it is previous that switching time and switching capacity rely on system
Operating experience, the accuracy and speed of inhibition is difficult to reach requirement；Using the method for changing system earth, in system operation mode
The generation that may cause resonance when varying widely brings bigger Voltage unbalance.Therefore, existing suppressing method is still deposited
In problem, it is unreliable to inhibit, and effect is unobvious.
Summary of the invention
There is provided the purpose of the present invention is overcome the deficiencies in the prior art it is a kind of effectively avoid high frequency noise effect based on
The residual voltage suppressing method of neutral ground impedance optimal control.
Technical scheme is as follows:
A kind of residual voltage suppressing method based on neutral ground impedance optimal control, detailed process is as follows:
S11, to power distribution network, parameter carries out real-time measurement over the ground；
S12, the parameter that arc suppression coil parallel resistance or series resistance are adjusted according to the parameter over the ground；
Further, the parameter over the ground includes direct-to-ground capacitance and ratio of damping.
Further, the specific practice of the step S11 is, when power grid operates normally, by arc suppression coil be tuned to it is separate
The state of resonance point, the size of real-time monitoring electric network capacitance and current, after single-phase earthing occurs for power grid, moment adjusts arc suppression coil
Implement compensation.
Further, the arc suppression coil that adjusts implements the time of compensation no more than 20ms.
Further, the arc suppression coil is parallel with damping resistance.
Further, the arc suppression coil is any in capacitor tuning type intelligent arc suppression or turn-adjusting intelligent arc suppression
Kind；The capacitor tuning type intelligent arc suppression is fixed capacity arc suppression coil, and band secondary winding ground connection holds cabinet, by adjusting access electricity
Hold the size that capacity changes compensation electric current；The turn-adjusting intelligent arc suppression uses multi gear position tap, electronic loaded switch tune
Section realizes automatic tuning for earthing compensation device.
Further, the damping resistance is neutral grounding by small resistance device.
Compared with prior art, the beneficial effects of the present invention are:
To power distribution network, parameter (direct-to-ground capacitance and ratio of damping) carries out real-time monitoring to the present invention over the ground in real time, and by joining over the ground
Several monitoring situations adjusts the size of arc suppression coil parallel connection damping resistance in real time；Wherein damping resistance is used and is connected in neutral point
Neutral grounding by small resistance device, to effectively on the one hand relay protector be made to have fault current limitation to modest size
Enough sensitivity and selectivity, while so that fault point is only generated local slight damage again, and then effectively prevent arc reignition, it keeps away
Exempt from arcing ground excessive pressure damages main equipment.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the invention is clearly and completely described,
Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the scope of protection of the invention.
A kind of residual voltage suppressing method based on neutral ground impedance optimal control, detailed process is as follows:
S11, to power distribution network, parameter carries out real-time measurement over the ground；
S12, the parameter that arc suppression coil parallel resistance or series resistance are adjusted according to the parameter over the ground；
Further, the parameter over the ground includes direct-to-ground capacitance and ratio of damping.
Further, the specific practice of the step S11 is, when power grid operates normally, by arc suppression coil be tuned to it is separate
The state of resonance point, the size of real-time monitoring electric network capacitance and current, after single-phase earthing occurs for power grid, moment adjusts arc suppression coil
Implement compensation.
Further, the arc suppression coil that adjusts implements the time of compensation no more than 20ms.
Further, the arc suppression coil is parallel with damping resistance.
Further, the arc suppression coil is any in capacitor tuning type intelligent arc suppression or turn-adjusting intelligent arc suppression
Kind；The capacitor tuning type intelligent arc suppression is fixed capacity arc suppression coil, and band secondary winding ground connection holds cabinet, by adjusting access electricity
Hold the size that capacity changes compensation electric current；The turn-adjusting intelligent arc suppression uses multi gear position tap, electronic loaded switch tune
Section realizes automatic tuning for earthing compensation device.
Further, the damping resistance is neutral grounding by small resistance device.
To power distribution network, parameter (direct-to-ground capacitance and ratio of damping) carries out real-time monitoring to the present invention over the ground in real time, and by joining over the ground
Several monitoring situations adjusts the size of arc suppression coil parallel connection damping resistance in real time；Wherein damping resistance is used and is connected in neutral point
Neutral grounding by small resistance device, to effectively on the one hand relay protector be made to have fault current limitation to modest size
Enough sensitivity and selectivity, while so that fault point is only generated local slight damage again, and then effectively prevent arc reignition, it keeps away
Exempt from arcing ground excessive pressure damages main equipment.
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art,
It is still possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is carried out etc.
With replacement, all within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in this
Within the protection scope of invention.
Claims (6)
1. a kind of residual voltage suppressing method based on neutral ground impedance optimal control, which is characterized in that detailed process is such as
Under:
S11, to power distribution network, parameter carries out real-time measurement over the ground；
S12, the parameter that arc suppression coil parallel resistance or series resistance are adjusted according to the parameter over the ground；
Further, the parameter over the ground includes direct-to-ground capacitance and ratio of damping.
2. the residual voltage suppressing method as described in claim 1 based on neutral ground impedance optimal control, feature exist
Be in: the specific practice of the step S11, when power grid operates normally, by arc suppression coil be tuned to the state far from resonance point,
The size of real-time monitoring electric network capacitance and current, after single-phase earthing occurs for power grid, moment adjusts arc suppression coil and implements compensation.
3. the residual voltage suppressing method as claimed in claim 2 based on neutral ground impedance optimal control, feature exist
In: the arc suppression coil that adjusts implements the time of compensation no more than 20ms.
4. the residual voltage suppressing method as claimed in claim 2 based on neutral ground impedance optimal control, feature exist
In: the arc suppression coil is parallel with damping resistance.
5. the residual voltage suppressing method according to any one of claims 1-4 based on neutral ground impedance optimal control,
It is characterized by: the arc suppression coil is any one of capacitor tuning type intelligent arc suppression or turn-adjusting intelligent arc suppression；Institute
Stating capacitor tuning type intelligent arc suppression is fixed capacity arc suppression coil, and band secondary winding ground connection holds cabinet, is held by adjusting access capacitor
Amount changes the size of compensation electric current；The turn-adjusting intelligent arc suppression uses multi gear position tap, and electronic loaded switch is adjusted, and is
Earthing compensation device realizes automatic tuning.
6. the residual voltage suppressing method as claimed in claim 4 based on neutral ground impedance optimal control, feature exist
In: the damping resistance is neutral grounding by small resistance device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811176189.4A CN109245081A (en) | 2018-10-09 | 2018-10-09 | A kind of residual voltage suppressing method based on neutral ground impedance optimal control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811176189.4A CN109245081A (en) | 2018-10-09 | 2018-10-09 | A kind of residual voltage suppressing method based on neutral ground impedance optimal control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109245081A true CN109245081A (en) | 2019-01-18 |
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ID=65055532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811176189.4A Pending CN109245081A (en) | 2018-10-09 | 2018-10-09 | A kind of residual voltage suppressing method based on neutral ground impedance optimal control |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101021556A (en) * | 2007-03-16 | 2007-08-22 | 长沙理工大学 | Distribution network earth insulation parameter measuring and controlling method |
| CN201038754Y (en) * | 2007-03-16 | 2008-03-19 | 长沙理工大学 | Distribution network neutral point earthing resistance measuring and control device |
| CN201282335Y (en) * | 2008-09-16 | 2009-07-29 | 东北电力科学研究院有限公司 | Arc-suppression coil buffer resistance box |
| CN107611958A (en) * | 2017-08-11 | 2018-01-19 | 国网新源水电有限公司新安江水力发电厂 | Automatic tracking and compensating arc distinction system for generator neutral point |
-
2018
- 2018-10-09 CN CN201811176189.4A patent/CN109245081A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101021556A (en) * | 2007-03-16 | 2007-08-22 | 长沙理工大学 | Distribution network earth insulation parameter measuring and controlling method |
| CN201038754Y (en) * | 2007-03-16 | 2008-03-19 | 长沙理工大学 | Distribution network neutral point earthing resistance measuring and control device |
| CN201282335Y (en) * | 2008-09-16 | 2009-07-29 | 东北电力科学研究院有限公司 | Arc-suppression coil buffer resistance box |
| CN107611958A (en) * | 2017-08-11 | 2018-01-19 | 国网新源水电有限公司新安江水力发电厂 | Automatic tracking and compensating arc distinction system for generator neutral point |
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Application publication date: 20190118 |
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