CN111987697B - Protection method and device for preventing three-phase fault distance protection refusal of swinging middle doorway - Google Patents
Protection method and device for preventing three-phase fault distance protection refusal of swinging middle doorway Download PDFInfo
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- CN111987697B CN111987697B CN202010750044.1A CN202010750044A CN111987697B CN 111987697 B CN111987697 B CN 111987697B CN 202010750044 A CN202010750044 A CN 202010750044A CN 111987697 B CN111987697 B CN 111987697B
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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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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Abstract
The invention discloses a protection method and a device for preventing three-phase fault distance protection refusal of an anti-oscillation middle doorway, wherein the protection method comprises the following steps: the action logic of the distance protection method in oscillation comprises the following steps: the method comprises the following steps of interphase I-section phase comparison circular action, interphase I-section fixed logic, symmetrical open logic and interphase I-section input, wherein in the interphase I-section fixed logic, a full impedance circle and a UCOS (unified control system) low threshold phase are added, and an interphase distance protection action is carried out after the symmetrical open logic and the interphase I-section fixed logic are simultaneously met. The phase comparison circle with the memory voltage is changed into a direction phase comparison circle without an original point after the memory voltage disappears by keeping the phase comparison logic of the phase-to-phase I section, a full impedance circle and a UCOS low threshold phase are added, the phase comparison I section is kept in a fixed state, and when the symmetry is opened and the phase-to-phase I section is met at the same time, the phase-to-phase distance protection acts.
Description
Technical Field
The invention relates to the field of power equipment control, in particular to a protection method and a protection device for preventing three-phase fault distance protection refusal of an anti-oscillation middle doorway.
Background
Because the potential phase angle between the generators changes with time when the power system is interfered (short circuit, fault removal, power supply input or removal and the like), the voltage and the electric current of each point in the system also change with time, the phenomenon is called oscillation, and the frequency of fault occurrence in the state during the actual operation of the power grid is higher, so that the fault removal fault during the oscillation needs to be solved, and the distance protection is prevented from refusing to operate.
The method for preventing the door three-phase fault distance protection from refusing action in oscillation is applied to a standardized line protection device and is realized by modifying the logic of a distance protection module. The inter-oscillation distance protection operation logic is shown in fig. 1, and in the inter-phase distance protection operation logic, a high threshold needs to be delayed for 500ms in a symmetric open condition, and a low threshold needs to be delayed for 150ms in a symmetric open condition, as shown in fig. 2. The interphase distance I section fixing logic in the interphase distance protection action logic adopts an interphase phase comparison circle with memory voltage, the memory voltage generally takes 3 cycles, 20ms of delay is needed, the interphase phase comparison circle returns along with disappearance of the memory voltage, so the interphase I section fixing logic only meets 40ms, the interphase I section is fixed and returned, the symmetrical open condition is not met, and the doorway three-phase fault interphase distance protection does not act during oscillation.
As shown in fig. 3, when the system oscillation gate three-phase fault occurs, the sampling voltage is zero, the measurement impedance is zero, the phase comparison phase circle with the memory voltage acts as a phase comparison circle that includes the origin, the memory voltage generally takes three cycles of previous voltage, the downward deviation phase comparison phase circle with the memory voltage becomes a direction comparison phase circle that does not include the origin along with disappearance of the memory voltage, the distance I section fixed logic returns, and therefore the phase distance I section does not act. The phase ratio circle with the memory voltage is shown in fig. 4 as a phase ratio circle including the origin. The direction phase ratio circle is shown in fig. 5 as a phase ratio circle that does not include the origin.
Disclosure of Invention
The invention aims to provide a protection method and a device for preventing three-phase fault distance protection refusal movement of an anti-oscillation middle doorway, which solve the problem that a phase comparison circle with memory voltage is changed into a direction phase comparison circle without an original point after the memory voltage disappears by maintaining fixed logic of an interphase I section, increase a full impedance circle, a UCOS low threshold phase and maintain a fixed state of the interphase I section, and perform interphase distance protection movement when the symmetry is opened and the interphase I ends are simultaneously satisfied.
In order to solve the above technical problem, a first aspect of an embodiment of the present invention provides a protection method for preventing a three-phase fault distance protection from moving during oscillation, where an operation logic of the protection method for preventing a three-phase fault distance protection during oscillation includes: the method comprises the following steps of interphase I-section phase comparison circular action, interphase I-section fixed logic, symmetrical open logic and interphase I-section input, wherein in the interphase I-section fixed logic, a full impedance circle and a UCOS (unified control operating System) low threshold phase are added, and the interphase I-section fixed state is kept, and when the symmetrical open logic and the interphase I-section fixed logic are simultaneously met, interphase distance protection action is carried out.
Further, the full impedance circle is an impedance circle that includes an origin.
Further, the phase-to-phase I-section phase comparison circle is a memory phase comparison circle, a phase comparison circle with compensation voltage or a phase comparison circle with a non-fault phase.
Correspondingly, a second aspect of the embodiments of the present invention provides a protection device for preventing three-phase fault distance protection from refusing to move in an oscillating middle doorway, where the action logic of the oscillating middle distance protection device includes an interphase I-section phase comparison circular action, an interphase I-section fixed logic, a symmetric open logic, and an interphase I-section input; and in the interphase I-section fixed logic, a full-impedance circle and a UCOS low threshold phase are added, and the interphase I-section fixed state is maintained, and after the symmetrical open logic and the interphase I-section fixed logic are simultaneously met, the interphase distance protection action is carried out.
Further, in the protection device for preventing the three-phase fault distance protection from moving in the anti-oscillation doorway, the full impedance circle is an impedance circle including an origin.
Further, in the protection device for preventing the three-phase fault distance protection of the anti-oscillation doorway from moving, the phase-to-phase I-section phase-comparison circle is a memory phase-comparison circle, a phase-comparison circle with compensation voltage or a phase-comparison circle with a non-fault phase.
The technical scheme of the embodiment of the invention has the following beneficial technical effects:
the phase comparison circle with the memory voltage is changed into a direction phase comparison circle without an original point after the memory voltage disappears by keeping the phase comparison logic of the phase-to-phase I section, a full impedance circle and a UCOS low threshold phase are added, the phase comparison I section is kept in a fixed state, and when the symmetry is opened and the phase-to-phase I end is met at the same time, the phase-to-phase distance protection acts.
Drawings
FIG. 1 is a logic diagram of a distance protection action in oscillation in the prior art;
FIG. 2 is a schematic diagram of a prior art symmetrical open logic;
FIG. 3 is a schematic diagram of a prior art inter-phase I-phase fixed logic;
FIG. 4 is a diagram of a prior art memory voltage ratio circle;
FIG. 5 is a schematic view of a prior art directional phase ratio circle;
FIG. 6 is a schematic diagram of inter-phase I-segment fixing logic provided by an embodiment of the present invention;
fig. 7 is a schematic diagram of a full impedance circle provided by an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Fig. 6 is a schematic diagram of inter-phase I-segment fixing logic provided in the embodiment of the present invention.
Fig. 7 is a schematic diagram of a full impedance circle provided by an embodiment of the invention.
Referring to fig. 6 and 7, a first aspect of the embodiment of the present invention provides a protection method for preventing the distance protection from the three-phase fault at the middle doorway during oscillation from refusing, where the operation logic of the protection method for the middle-oscillation distance includes: the method is characterized in that a full-impedance circle, a UCOS (oscillation center voltage) low threshold phase and an interphase I section fixed state are added to the interphase I section fixed logic, and when the symmetric open logic and the interphase I section fixed logic are met simultaneously, an interphase distance protection action is performed.
The technical scheme is that phase comparison circles with memory voltage are changed into direction phase comparison circles without an original point after the memory voltage disappears by keeping phase-to-phase I section fixed logic, a full impedance circle and a UCOS low threshold phase are added, the phase-to-phase I section fixed state is kept, and when symmetry is opened and phase-to-phase I ends meet the requirement, phase-to-phase distance protection acts.
Specifically, the full impedance circle is an impedance circle including the origin.
Further, the phase-to-phase I section phase comparison circle is a memory phase comparison circle, a phase comparison circle with compensation voltage or a phase comparison circle with a non-fault phase.
In the specific implementation manner of the embodiment of the invention, when the system oscillation fails, the interphase I-section phase comparison circle is satisfied at the initial moment of the failure, and returns along with the disappearance of the memory voltage, and the interphase I-section phase comparison circle is maintained all the time as the logic increases the full-impedance circle and the UCOS conditional phase, so that the interphase I-section logic does not return after the door opening failure in the oscillation, and the distance protection can act to remove the failure after the symmetrical open condition is satisfied.
During the system oscillation, satisfy system oscillation mark state and satisfy, the gate three-phase trouble takes place this moment, full-phase oscillation DI2 open condition satisfies, at the trouble initial stage, alternate I section is than phase circle AB, BC, CA and all satisfies, alternate I section fixed state satisfies, along with memory voltage disappears, alternate I section is than phase circle AB, BC, CA and returns, because logic has increased alternate AB, BC, CA full impedance circle and keeps, alternate I section fixed state satisfies always, after the open condition of symmetry satisfies, the distance protection moves.
Correspondingly, a second aspect of the embodiments of the present invention provides a protection device for preventing the three-phase fault distance protection of the swing-proof middle doorway from failing, wherein the action logic of the swing-proof middle doorway distance protection device includes an interphase I-section phase comparison circular action, an interphase I-section fixed logic, a symmetrical open logic, and an interphase I-section input; the method is characterized in that in the interphase I-section fixed logic, a full-impedance circle and a UCOS (unified control system) low threshold phase are added, and the interphase distance protection action is carried out after the symmetrical open logic and the interphase I-section fixed logic are simultaneously met.
Specifically, the full impedance circle is an impedance circle including the origin.
Further, the phase-to-phase I section phase comparison circle is a memory phase comparison circle, a phase comparison circle with compensation voltage or a phase comparison circle with a non-fault phase.
The embodiment of the invention aims to protect a protection method and a device for preventing three-phase fault distance protection refusal of an anti-oscillation middle doorway, wherein the protection method comprises the following steps: the action logic of the distance protection method in oscillation comprises the following steps: the method comprises the following steps of interphase I-section phase comparison circular action, interphase I-section fixed logic, symmetrical open logic and interphase I-section input, wherein in the interphase I-section fixed logic, a full impedance circle and a UCOS (unified control system) low threshold phase are added, and an interphase distance protection action is carried out after the symmetrical open logic and the interphase I-section fixed logic are simultaneously met. The technical scheme has the following effects:
the phase comparison circle with the memory voltage is changed into a direction phase comparison circle without an original point after the memory voltage disappears by keeping the phase comparison logic of the phase-to-phase I section, a full impedance circle and a UCOS low threshold phase are added, the phase comparison I section is kept in a fixed state, and when the symmetry is opened and the phase-to-phase I end is met at the same time, the phase-to-phase distance protection acts.
It should be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (6)
1. A protection method for preventing the distance protection from the three-phase fault of the swinging middle door from refusing the action comprises the following action logics: the method comprises the following steps that an interphase I-section phase comparison circle action, an interphase I-section fixed logic, a symmetrical open logic and an interphase I-section input are carried out, and the method is characterized in that a full-impedance circle and a UCOS (unified control system) low threshold phase are added in the interphase I-section fixed logic to keep the interphase I-section fixed state, and when the symmetrical open logic and the interphase I-section fixed logic are simultaneously met, an interphase distance protection action is carried out;
wherein the UCOS low threshold is a preset voltage value of the UCOS.
2. The protection method against the three-phase fault distance protection refusal at the anti-oscillation doorway of claim 1, wherein the full impedance circle is an impedance circle including an origin.
3. The protection method for preventing three-phase fault distance protection rejection of the swing-proof doorway according to claim 1, wherein the interphase I-segment phase comparison circle is a memory phase comparison circle, a phase comparison circle with compensation voltage or a phase comparison circle of a non-fault phase.
4. A protection device for preventing three-phase fault distance protection of an anti-oscillation middle doorway from refusing to move comprises action logics of an interphase I section phase comparison circle action, an interphase I section fixed logic, a symmetrical open logic and an interphase I section input; the method is characterized in that in the interphase I-section fixed logic, a full-impedance circle and a UCOS (unified control operating system) low threshold phase are added to maintain the fixed state of the interphase I-section, and when the symmetrical open logic and the interphase I-section fixed logic are simultaneously met, the interphase distance protection acts;
the UCOS low threshold is a preset voltage value of the UCOS.
5. The protection device for preventing the three-phase fault distance protection from swinging in the doorway of claim 4, wherein the full impedance circle is an impedance circle including an origin.
6. The protection device for preventing the three-phase fault distance protection rejection of the swing-proof middle doorway according to claim 4, wherein the interphase I-section phase comparison circle is a memory phase comparison circle, a phase comparison circle with compensating voltage or a phase comparison circle of a non-fault phase.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010750044.1A CN111987697B (en) | 2020-07-30 | 2020-07-30 | Protection method and device for preventing three-phase fault distance protection refusal of swinging middle doorway |
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| CN202010750044.1A CN111987697B (en) | 2020-07-30 | 2020-07-30 | Protection method and device for preventing three-phase fault distance protection refusal of swinging middle doorway |
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| CN111987697A CN111987697A (en) | 2020-11-24 |
| CN111987697B true CN111987697B (en) | 2022-11-25 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101267109A (en) * | 2008-01-02 | 2008-09-17 | 朱声石 | New method for distance protection surge lock of high voltage output line |
| CN101662140A (en) * | 2009-08-31 | 2010-03-03 | 国电南京自动化股份有限公司 | Distance switching-in accelerating method self-adapting to oscillation |
| CN102749517A (en) * | 2012-07-11 | 2012-10-24 | 北京四方继保自动化股份有限公司 | Method for monitoring and analyzing oscillation impedance measurement track of electric power system |
| CN103580009A (en) * | 2013-11-11 | 2014-02-12 | 华北电力大学 | Self-adaptive overload recognition system based on composite phasor plane and method thereof |
| CN104269831A (en) * | 2014-10-15 | 2015-01-07 | 国家电网公司 | Method for achieving distance protection through overload and fault recognition in power transmission line |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9444245B2 (en) * | 2013-03-13 | 2016-09-13 | San Diego Gas & Electric Company | Methods and systems for adaptive distance protection |
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- 2020-07-30 CN CN202010750044.1A patent/CN111987697B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101267109A (en) * | 2008-01-02 | 2008-09-17 | 朱声石 | New method for distance protection surge lock of high voltage output line |
| CN101662140A (en) * | 2009-08-31 | 2010-03-03 | 国电南京自动化股份有限公司 | Distance switching-in accelerating method self-adapting to oscillation |
| CN102749517A (en) * | 2012-07-11 | 2012-10-24 | 北京四方继保自动化股份有限公司 | Method for monitoring and analyzing oscillation impedance measurement track of electric power system |
| CN103580009A (en) * | 2013-11-11 | 2014-02-12 | 华北电力大学 | Self-adaptive overload recognition system based on composite phasor plane and method thereof |
| CN104269831A (en) * | 2014-10-15 | 2015-01-07 | 国家电网公司 | Method for achieving distance protection through overload and fault recognition in power transmission line |
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| CN111987697A (en) | 2020-11-24 |
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