CN109149531B - Distance protection method and device for phase-to-phase ground fault - Google Patents
Distance protection method and device for phase-to-phase ground fault Download PDFInfo
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- CN109149531B CN109149531B CN201710501849.0A CN201710501849A CN109149531B CN 109149531 B CN109149531 B CN 109149531B CN 201710501849 A CN201710501849 A CN 201710501849A CN 109149531 B CN109149531 B CN 109149531B
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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 relates to a distance protection method and a distance protection device for phase-to-phase earth faults. When the interphase grounding fault occurs in the weak feed system, the action condition of the impedance element of the fault phase is met, the action condition of the impedance element of the non-fault phase is not met, and the two-phase fault is selected by the voltage with the sudden change, the interphase grounding fault is removed through open grounding distance protection at the moment. According to the invention, the door-to-door ground fault is removed through the ground distance action by modifying the action logic of the ground distance protection in the program of the line protection device. And no matter the phase selection result is two fault phases or three phases, the effective removal of the indirect fault in the area in the oscillation or weak feed system can be ensured.
Description
Technical Field
The invention belongs to the field of relay protection automation, and particularly relates to a distance protection method and device for indirect phase-to-ground faults.
Background
In the process of the actual power grid running state, a fault condition that the phase in the oscillation or the weak feed indirectly fails exists, and if the fault of the weak feed system occurs at a door or when the voltage wave trough in the oscillation fails, the inter-phase distance is rejected because the memory voltage is smaller than the inter-phase distance relay action threshold. Meanwhile, in oscillation, the condition of mistakenly selecting three phases exists in two-phase grounding faults, and the grounding distance protection is locked by a fault phase selection and selection single phase, so that the grounding distance protection is refused to operate.
Disclosure of Invention
The invention aims to provide a distance protection method and a distance protection device for phase-to-phase ground faults, which are used for solving the problem of distance protection refusal when the phase-to-phase ground faults occur in the oscillation process of the existing system.
In order to solve the technical problem, the invention provides a distance protection method for indirectly fault in phase, which comprises the following steps:
1) when an interphase grounding short circuit fault occurs in the power system, firstly, oscillation and weak feed judgment are carried out according to a fault voltage current waveform and a phase selection result;
2) when the power system oscillates, the action condition of the impedance element of the fault phase is met, the action condition of the impedance element of the non-fault phase is not met, the fault phase is selected to be two phases or three phases, and the ground distance protection is opened;
3) when the power system is a weak feed system, the action conditions of the impedance elements of the fault phase are met, the action conditions of the impedance elements of the non-fault phase are not met, the phase selection of the voltage with the sudden change is two phases, and the ground distance protection is opened.
The impedance element of the failed phase and the impedance element of the non-failed phase are both elements having a quadrangular impedance characteristic.
And when the interphase grounding short circuit fault is an out-of-area fault, locking the motion of the advanced phase quadrilateral by adopting the non-motion of the lagging phase quadrilateral.
In order to solve the above technical problem, the present invention further provides a distance protection device for indirectly failing in phase, including a processor, where the processor is configured to execute instructions for implementing the following method:
1) when an interphase grounding short circuit fault occurs in the power system, firstly, oscillation and weak feed judgment are carried out according to a fault voltage current waveform and a phase selection result;
2) when the power system oscillates, the action condition of the impedance element of the fault phase is met, the action condition of the impedance element of the non-fault phase is not met, the fault phase is selected to be two phases or three phases, and the ground distance protection is opened;
3) when the power system is a weak feed system, the action conditions of the impedance elements of the fault phase are met, the action conditions of the impedance elements of the non-fault phase are not met, the phase selection of the voltage with the sudden change is two phases, and the ground distance protection is opened.
The impedance element of the failed phase and the impedance element of the non-failed phase are both elements having a quadrangular impedance characteristic.
And the processor is also used for locking the motion of the advanced phase quadrangle by adopting the non-motion of the lagging phase quadrangle when the interphase grounding short circuit fault is an out-of-range fault.
The invention has the beneficial effects that: in the oscillation process of the power system, if an interphase grounding fault occurs, the operating condition of the impedance element of the fault phase is met, the operating condition of the impedance element of the non-fault phase is not met, and the grounding distance protection is opened when the fault phase selection is two-phase or three-phase. According to the invention, the door-to-door ground fault is removed through the ground distance action by modifying the action logic of the ground distance protection in the program of the line protection device. And no matter the phase selection result is two fault phases or three phases, the effective removal of the indirect fault in the area in the oscillation system can be ensured.
When the interphase grounding fault occurs in the weak feed system, the action condition of the impedance element of the fault phase is met, the action condition of the impedance element of the non-fault phase is not met, and the two-phase fault is selected by the voltage with the sudden change, the interphase grounding fault is removed through open grounding distance protection at the moment.
In addition, if the system oscillation or weak feed has the out-of-range phase indirect fault, the method of locking the leading phase by the lagging phase can reliably prevent the leading phase distance protection from misoperation.
Drawings
FIG. 1 is a diagram of a 110kv line dynamic simulation system;
FIG. 2 is a logic diagram of a distance protection method for a phase-to-phase indirect fault;
FIG. 3 is a phase-to-phase ground fault waveform diagram in oscillation;
fig. 4 is a waveform diagram of a phase indirectly fault in a weak feed.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The invention provides a method for removing interphase ground faults by using ground distance protection action on the premise of analyzing the fault characteristics and the phase selection result of the indirect ground faults in the oscillation or weak feed phase, which comprises the following steps:
(1) when an interphase grounding short circuit fault occurs in the power system, firstly, oscillation and weak feed judgment are carried out according to the acquired voltage and current waveforms and the phase selection result; if the system does not oscillate and is not a weak feed system, the fault is removed by the phase distance action because the grounding distance is locked by the single phase.
(2) If the inter-zone phase in the system oscillation indirectly fails, the failure phase quadrangle is satisfied, the non-failure phase quadrangle is not satisfied, and the inter-phase voltage is simultaneously applied
The phase selection result is two-phase fault or three-phase fault, the grounding distance protection is opened, and the fault is removed.
(3) If the phase in the occurrence area in the weak feed system indirectly fails, the fault phase quadrangle is satisfied, the non-fault phase quadrangle is not satisfied, and meanwhile, the abrupt change variable voltage phase selection result is two fault phases, so that the grounding distance protection is opened, and the fault is removed.
(4) If the out-of-zone phase indirectly fails in the system oscillation or the out-of-zone phase indirectly fails in the weak feed system, the leading phase quadrangle is possibly satisfied and the leading phase malfunction is caused, so that the lagging phase quadrangle is adopted to not satisfy the locking leading phase grounding distance, and the grounding distance malfunction is prevented.
The invention indirectly fails within the zone of occurrence in the system oscillation, whether it be
The phase selection result is two fault phases or three phases, and the grounding distance protection can be used for removing faults; if the internal phase of the weak feed system generation area indirectly fails, the grounding distance protection can also act to remove the fault at the moment because the voltage of the abrupt change quantity selects two fault phases; if the system oscillation or weak feed occurs the out-of-range phase indirect fault, the method of locking the leading phase by the lagging phase can reliably prevent the leading phase distance protection from malfunction. The invention can effectively remove the inter-area indirect faults in the oscillation system, the weak feed system and the normal operation system, and can prevent the inter-area indirect fault distance protection maloperation.
The invention is applied to a line protection device, and by modifying the action logic of ground distance protection in a program of the line protection device, the logic realizes that the gate inter-phase ground fault is cut off through the ground distance action, as shown in figure 2, the inter-phase ground fault in a region can be correctly cut off, and the inter-phase ground fault outside the region can be ensured not to be mistakenly operated. Taking a 110kv circuit dynamic simulation system diagram as an example, a circuit three-phase current is obtained through a circuit three-phase current transformer TA1, and a circuit three-phase voltage is obtained through a voltage transformer TV 1. The 110kv line simulation system is shown in fig. 1.
Through RTDS simulation of a 110kv moving die system, interphase ground faults of points K1, K2, K3, K4 and K5 are simulated respectively, the effectiveness of the method for solving the problem of phase-to-phase indirect ground distance refusal in oscillation is verified, and the waveform of the interphase ground fault at an M side door AB in oscillation is shown in fig. 3. Meanwhile, weak feed system simulation is carried out, the M side is a weak power supply, phase-to-phase grounding fault simulation is carried out on K1-K5 points respectively, the effectiveness of the method for solving phase-to-phase indirect grounding distance refusal in the weak feed is verified, and the waveform of the phase-to-phase grounding fault AB at the M side door in the weak feed is shown in fig. 4.
When the system has a fault, three-phase current and three-phase voltage collected by TA1 and TV1 are subjected to oscillation or weak feedback judgment, if the system does not oscillate, the system is not a weak feedback system, indirect faults in K2 point areas and K3 point areas in the simulation system are simulated respectively, the faults can be removed through interphase distance protection, meanwhile, the indirect faults outside the K1 point areas, the K4 point areas and the K5 point areas are not subjected to faults, and the interphase distance is not misoperated.
If the system oscillation is judged, when the inter-phase grounding faults of the simulation system K2 point and the simulation system K3 point exist, if the voltage is just the wave trough, the inter-phase distance relay does not work, the fault can be removed through the action of the grounding distance, and if the fault is removed through the action of the grounding distance
And selecting the selected phase as two fault phases, wherein the two fault phase quadrangles meet the action condition, the non-fault phase quadrangles do not meet the action condition, and the fault can be reliably removed by acting according to the logic grounding distance I section. If it is
And the phase selection is mistakenly selected into three phases, the two fault phase quadrangles meet the action condition, the non-fault phase quadrangles do not meet the action condition, and the two fault phase quadrangles can also act according to the logic grounding distance I section, so that the fault can be reliably removed.
If the system is judged to oscillate, when a phase-to-phase indirect ground fault occurs at the simulation system K4 point, the fault is an out-of-area fault at the moment, the measured impedance of the phase-to-phase ground fault leading-phase becomes small, so that the grounding distance I section is mistakenly operated, and the leading-phase action is locked through the lagging phase quadrangle non-action, so that the leading-phase misoperation is prevented.
If the fault is judged to be a weak feed system, when the K2 point and the K3 point of the simulation system have interphase grounding faults, the situation that an interphase distance relay does not work can exist due to the fact that the gate voltage is low at the moment, the fault can be removed through grounding distance action, the sudden change voltage is selected to be two fault phases reliably, two fault phase quadrangles meet action conditions, a non-fault phase quadrangle does not meet the action conditions, and the fault can be removed reliably and can be achieved actively according to the logic grounding distance I section.
If the fault is judged to be a weak feed system, when a phase-to-ground fault occurs at the simulation system K4 point, the fault is an out-of-area fault at the moment, the measured impedance of the phase-to-phase ground fault leading phase is reduced, so that the grounding distance I section is mistakenly operated, and the leading phase is locked through the lagging phase quadrangle inaction to prevent the leading phase misoperation.
In addition, the invention also provides a distance protection device for indirectly fault in phase, which comprises a processor and is used for operating instructions for implementing the following method:
when an interphase grounding short circuit fault occurs in the power system, firstly, oscillation and weak feed judgment are carried out according to a fault voltage current waveform and a phase selection result; when the power system oscillates, the action condition of the impedance element of the fault phase is met, the action condition of the impedance element of the non-fault phase is not met, the fault phase is selected to be two phases or three phases, and the ground distance protection is opened; when the power system is a weak feed system, the action conditions of the impedance elements of the fault phase are met, the action conditions of the impedance elements of the non-fault phase are not met, the phase selection of the voltage with the sudden change is two phases, and the ground distance protection is opened.
The distance protection device is a computer solution based on the method flow, namely a software framework, and can be applied to a relay protection device, namely a processing process corresponding to the method flow. Since the description of the above method is sufficiently clear and complete, the distance protection device will not be described in detail.
Claims (6)
1. A method of distance protection against phase-to-phase ground faults, comprising the steps of:
1) when an interphase grounding short circuit fault occurs in the power system, firstly, oscillation and weak feed judgment are carried out according to a fault voltage current waveform and a phase selection result;
2) when the power system oscillates, the action condition of the impedance element of the fault phase is met, the action condition of the impedance element of the non-fault phase is not met, the fault phase is selected to be two phases or three phases, and the ground distance protection is opened;
3) when the power system is a weak feed system, the action conditions of the impedance elements of the fault phase are met, the action conditions of the impedance elements of the non-fault phase are not met, the phase selection of the voltage with the sudden change is two phases, and the ground distance protection is opened.
2. A distance protection method for a phase-to-phase ground fault according to claim 1, characterized in that the impedance elements of the faulty phase and the impedance elements of the non-faulty phase are both elements having quadrilateral impedance characteristics.
3. The method for distance protection of an inter-phase ground fault according to claim 1, wherein when the inter-phase ground short-circuit fault is an out-of-area fault, the lagging phase quadrilateral does not act to lock the leading phase quadrilateral.
4. A phase-indirect fault distance protection device comprising a processor, wherein the processor is configured to execute instructions that implement a method comprising:
1) when an interphase grounding short circuit fault occurs in the power system, firstly, oscillation and weak feed judgment are carried out according to a fault voltage current waveform and a phase selection result;
2) when the power system oscillates, the action condition of the impedance element of the fault phase is met, the action condition of the impedance element of the non-fault phase is not met, the fault phase is selected to be two phases or three phases, and the ground distance protection is opened;
3) when the power system is a weak feed system, the action conditions of the impedance elements of the fault phase are met, the action conditions of the impedance elements of the non-fault phase are not met, the phase selection of the voltage with the sudden change is two phases, and the ground distance protection is opened.
5. The phase-to-phase ground fault distance protection device according to claim 4, wherein the impedance elements of the faulted phase and the impedance elements of the non-faulted phase are each elements having quadrilateral impedance characteristics.
6. The interphase ground fault distance protection device according to claim 4, wherein the processor is further configured to lock the leading phase quadrilateral action with the lagging phase quadrilateral inaction when the interphase ground short fault is an out-of-range fault.
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| CN201710501849.0A CN109149531B (en) | 2017-06-27 | 2017-06-27 | Distance protection method and device for phase-to-phase ground fault |
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| CN201710501849.0A CN109149531B (en) | 2017-06-27 | 2017-06-27 | Distance protection method and device for phase-to-phase ground fault |
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