CN117810927A - Bus fault isolation method and system for self-healing of distribution network - Google Patents
Bus fault isolation method and system for self-healing of distribution network Download PDFInfo
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Abstract
The invention discloses a bus fault isolation method and a system for self-healing of a distribution network, which belong to the field of self-healing of distribution networks. When the internal bus fault positioning element detects a bus fault, positioning tripping is carried out after the original equipment completes fault isolation action, so that the relevant isolating switch for fault isolation of the bus is ensured to be reliably tripped; namely, the reliability of bus fault isolation is ensured. An internal bus fault positioning element, an external signal detection element and a secondary tripping element of the intelligent distributed terminal are adopted; the problem of unreliable tripping operation during bus faults is solved.
Description
Technical Field
The invention belongs to the field of self-healing of distribution networks, and particularly relates to a bus fault isolation method and system for self-healing of distribution networks.
Background
The existing switch station is externally connected with an external bus fault protection device, and the bus in the switch station is protected by the external bus fault protection device, so that when a bus fault is detected, an on-off signal is sent out, and the related protection switch on the bus is tripped to isolate the fault. The bus fault protection device can possibly generate an abnormality in the process from sending a signal to converting the signal into a signal which can be identified by the related protection switch after the fault is detected, and the abnormality can cause the bus fault isolation failure.
In order to solve the problem, the bus fault at the upper stage of the bus or the switching station at the upper stage of the bus is detected to perform integral power-off isolation, so that the fault isolation of the bus is realized. Although the effect of isolating bus faults is achieved temporarily, the isolating protection automatically restores power supply within a certain period of time, and a protection switch of the bus is closed at the moment, if the faults are not eliminated, the section of bus is attacked by the faults, so that equipment connected with the bus is damaged.
In conclusion, the existing bus fault protection device has unreliable fault tripping and is easy to damage equipment connected with a bus.
Disclosure of Invention
The invention aims to provide a bus fault isolation method and system for self-healing of a distribution network, which are used for solving the technical problems that in the prior art, a bus fault protection device has unreliable fault tripping and is easy to cause damage to equipment connected with a bus.
In order to achieve the above purpose, the technical scheme of the bus fault isolation method and system for self-healing of the distribution network provided by the invention is as follows:
a bus fault isolation method for self-healing of distribution network comprises the following steps: when a bus differential protection action starting signal is detected and is in a locking state, detecting a bus state, starting a follow-up jump when no-voltage and no-current of the bus of the section are detected, sending a follow-up jump signal, and tripping a relevant isolating switch of the bus of the section to isolate faults after the follow-up jump is performed after self-healing tripping time; when no bus differential protection action start signal is detected, the bus fault is positioned to the section and the bus fault signal is in a locking state, the bus state is detected, when no-voltage and no-current of the section of bus are detected, positioning tripping is started, a positioning tripping signal is sent out, the tripping action is positioned after self-healing tripping time, and the section of bus related isolating switch is tripped to isolate the fault.
As a further improvement, the busbar no-voltage no-current refers to the busbar no-voltage, the incoming line interval no-current, the outgoing line interval no-current and the sectionalized interval no-current of the section.
The beneficial effects are that: the electrical conditions of all key positions of the bus are detected, so that the accuracy of the non-voltage and non-current judgment of the bus is ensured.
As a further improvement, tripping the bus bar related disconnector of the section refers to tripping the line-in interval, the line-out interval, the segment interval and the small power line interval off and tripping the opposite side switch.
The beneficial effects are that: by tripping the switches at the relevant positions, the reliability of fault isolation is ensured.
As a further improvement, when no pressureless no flow of the bus of the section is detected in the whole group of resetting time, a follow-up jump signal is detected after the follow-up jump is started or the follow-up jump is detected, the differential protection action on signal of the bus is unlocked.
The beneficial effects are that: in order to save the loss of equipment detection, the equipment is ensured to detect only when necessary through the action of locking equipment detection.
As a further improvement, the positioned bus fault signal is unlocked when no voltage or current is detected for the whole set of resetting time, the positioned trip signal is detected after the positioned trip is started, or the positioned trip action is detected.
The beneficial effects are that: in order to avoid the detection of the equipment when the equipment is unnecessary, the equipment is ensured to be detected only when the equipment is necessary by locking the detection action of the equipment and unlocking the detection of the equipment when the equipment is necessary, the irrelevant expenditure of the equipment is reduced, and the service life of the equipment is prolonged.
The invention also discloses a bus fault isolation system for self-healing of the distribution network, which comprises an intelligent distributed terminal, wherein the intelligent distributed terminal is arranged on each switch station in a communication connection manner with an external bus protection device; the intelligent distributed terminal comprises an internal bus fault positioning element, an external signal detection element, a follow-up element and a positioning tripping element;
the internal bus fault positioning element is used for positioning the corresponding bus fault; the external signal detection element is used for detecting a bus differential protection action start signal of the external bus protection device; the follow-up jump element is used for detecting the state of the bus when the differential protection action start signal of the bus is detected and is in a locking state, starting the follow-up jump when the non-pressure and non-flow of the bus of the section are detected, sending the follow-up jump signal, and tripping the related isolating switch of the bus of the section to isolate faults after the follow-up jump is performed after the self-healing trip time;
the positioning tripping element is used for detecting the bus state when the bus differential protection action on signal is not detected, the bus fault is positioned to the section and the bus fault signal is in the locking state, starting positioning tripping when the section of bus is detected to be pressureless and no-current, sending a positioning tripping signal, positioning tripping after self-healing tripping time, and tripping the section of bus related isolating switch to isolate the fault.
As a further improvement, the busbar no-voltage no-current refers to the busbar no-voltage, the incoming line interval no-current, the outgoing line interval no-current and the sectionalized interval no-current of the section.
As a further improvement, tripping the bus bar related disconnector of the section refers to tripping the line-in interval, the line-out interval, the segment interval and the small power line interval off and tripping the opposite side switch.
As a further improvement, when no pressureless no flow of the bus of the section is detected in the whole group of resetting time, a follow-up jump signal is detected after the follow-up jump is started or the follow-up jump is detected, the differential protection action on signal of the bus is unlocked.
As a further improvement, the positioned bus fault signal is unlocked when no voltage or current is detected for the whole set of resetting time, the positioned trip signal is detected after the positioned trip is started, or the positioned trip action is detected.
The bus fault isolation method for the self-healing of the distribution network has the beneficial effects that: when the on-off signal is detected, the external bus protection device is indicated to detect bus faults and send out action signals to related isolating switches of the bus. The internal bus fault positioning element is used for positioning bus faults, namely detecting the state of the bus and checking whether the bus has faults or not. After the external bus protection equipment sends out an on-off signal, the state of the bus is detected, and the bus fault is successfully isolated when the bus is pressureless and free, so that the fault of the bus is indirectly isolated in order to avoid the tripping of other switches, and the fault isolation is not completed by tripping of the relevant isolating switch of the bus, therefore, the follow-up is carried out, and the reliable tripping of the relevant isolating switch of the bus is ensured, namely the reliability of fault isolation is ensured. When the on signal is not detected, but the fault of the bus of the section is positioned, other equipment is waited for isolating the fault of the bus and positioning tripping is carried out, and the same is also used for ensuring that the related isolating switch of the fault bus is reliably tripped. The problem that tripping is unreliable when a bus fails is solved through tripping and positioning tripping.
The bus fault isolation system for the self-healing of the distribution network has the beneficial effects that: an intelligent distributed terminal is newly added to the bus fault protection system, and after the terminal detects a bus fault in external bus protection equipment, follow-up is carried out to ensure that the related isolating switch of the bus can be reliably tripped. When the internal bus fault positioning element detects a bus fault, positioning tripping is carried out after the original equipment completes fault isolation action, so that the relevant isolating switch for fault isolation of the bus is ensured to reliably trip. The reliability of bus fault isolation is guaranteed. An internal bus fault positioning element, an external signal detection element, a follow-up element and a positioning tripping element of the intelligent distributed terminal are adopted; the problem of unreliable tripping operation during bus faults is solved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a self-healing bus fault isolation system for a distribution network according to the present invention;
FIG. 2 is a schematic diagram illustrating the function of a follow-up element in an embodiment of a self-healing bus fault isolation system of the present invention;
fig. 3 is a schematic diagram of the function of the locating trip element in an embodiment of the distribution network self-healing bus fault isolation system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Bus fault isolation system embodiment of distribution network self-healing:
as shown in fig. 1, a self-healing bus fault isolation system of a distribution network comprises an external bus protection device and an intelligent distributed terminal; the intelligent distributed terminal is in communication connection with the external bus protection device and is arranged on each switch station. The external bus protection device is used for sending an on-off signal when a bus fault is detected, so that a bus related isolating switch trips to isolate the fault.
The intelligent distributed terminal comprises an internal bus fault positioning element, an external signal detection element, a follow-up tripping element and a positioning tripping element.
In particular, the internal bus fault locating element of the terminal is used to locate a corresponding bus fault.
The external signal detection element of the terminal is used for detecting the output signal of the external bus protection device.
As shown in fig. 2, when the bus differential protection action start signal is detected and is in a locking state, the bus state is detected, when the bus non-voltage non-current of the section is detected, the follow-up jump is started and a follow-up jump signal is sent when the bus non-voltage non-current of the section is detected, the follow-up jump is performed after the self-healing trip time, and the relevant isolating switch of the bus of the section is tripped to isolate faults. When the on signal is detected, the external bus protection device is indicated to detect a bus fault. Indicating that the bus fault has been successfully isolated when the bus is in no voltage and no current. However, the action of isolating faults may be completed by the bus at the previous stage, and the relevant isolating switch of the bus at the present stage may not be tripped, so that in order to avoid the above phenomenon, the follow-up element of the terminal starts the follow-up and trips the switch of the relevant isolating faults of the bus. The self-healing trip time is typically 10 seconds; the whole set of resetting time is generally 30 seconds, and the two times can be adaptively adjusted according to the actual application conditions of engineering.
As shown in fig. 3, the positioning tripping element of the terminal is used for detecting the bus state when the bus differential protection action on signal is not detected, the bus fault is positioned at the section and the bus fault signal is in the locking state, starting positioning tripping when the section of bus is detected to be pressureless and no-current, sending a positioning tripping signal, positioning tripping action after self-healing tripping time, and tripping off the section of bus related isolating switch to isolate the fault.
The bus non-voltage and non-current refers to the bus non-voltage, the incoming line interval non-current, the outgoing line interval non-current and the sectionalized interval non-current of the section. The electrical conditions of all key positions of the bus are detected, so that the accuracy of the non-voltage and non-current judgment of the bus is ensured.
The above-mentioned tripping-off of the relevant isolating switch of the bus bar of the section refers to tripping-off of the switch on the opposite side of the switch at the interval of the incoming line, the interval of the outgoing line, the interval of the segmentation and the interval of the small power line. By tripping the switches at the relevant positions, the reliability of fault isolation is ensured.
As shown in fig. 2, because the effective duration of the signal is limited, in order to avoid that the locked signal affects the subsequent judgment, when no voltage or no current of the bus of the section is detected in the whole set of resetting time, the heel-jump signal is detected after the heel-jump is started, or the heel-jump action is detected, the differential protection action starting signal of the bus is unlocked. When no pressureless stream of the bus of the section is detected in the whole set of resetting time, the follow-up signal is detected after the follow-up is started or the follow-up action is detected, the three conditions indicate that the action of the start-up signal is used up, new judgment is needed to be made according to the newly detected start-up signal condition, and therefore the signal needs to be unlocked. Meanwhile, the corresponding signal detection equipment can be locked and unlocked while the signals are locked and unlocked, so that the loss of equipment detection is saved, and the equipment is ensured to be detected only when necessary.
As shown in fig. 3, the effective duration of the same positioning bus fault signal is also limited, so as to avoid that the locked signal affects the subsequent judgment, and when no voltage and no current of the bus of the section are detected in the whole set of resetting time, the positioning tripping signal is detected after the positioning tripping is started, or the positioning tripping action is detected, the positioned bus fault signal is unlocked. Meanwhile, the corresponding signal detection equipment can be locked and unlocked while the signals are locked and unlocked, so that the loss of equipment detection is saved, the equipment is ensured to be detected only when necessary, the irrelevant expenditure of the equipment is reduced, and the service life of the equipment is prolonged.
In addition, the unlocking conditions in fig. 2 and 3 refer to the corresponding data of the last determination, for example, the positioning trip action in fig. 3 refers to whether the positioning trip in the last positioning trip determination is performed.
The invention ensures the reliability of bus fault isolation by adding the terminal equipment to carry out follow-up and positioning tripping during bus faults.
Bus fault isolation method embodiment for self-healing of distribution network:
the bus fault isolation method for the self-healing of the distribution network comprises the following steps: when a bus differential protection action starting signal is detected and is in a locking state, detecting a bus state, starting a follow-up jump when no-voltage and no-current of the bus of the section are detected, sending a follow-up jump signal, and tripping a relevant isolating switch of the bus of the section to isolate faults after the follow-up jump is performed after self-healing tripping time;
when no bus differential protection action start signal is detected, the bus fault is positioned to the section and the bus fault signal is in a locking state, the bus state is detected, when no-voltage and no-current of the section of bus are detected, positioning tripping is started, a positioning tripping signal is sent out, the tripping action is positioned after self-healing tripping time, and the section of bus related isolating switch is tripped to isolate the fault.
The method solves the problem that tripping is unreliable when a bus fails through the intelligent distributed terminal. The embodiment refers to the above embodiment of the self-healing bus fault isolation system of the distribution network, and will not be described herein again.
It should be noted that the above-mentioned embodiments are merely preferred embodiments of the present invention, and the present invention is not limited to the above-mentioned embodiments, but may be modified without inventive effort or equivalent substitution of some of the technical features thereof by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The bus fault isolation method for the self-healing of the distribution network is characterized by comprising the following steps of:
when a bus differential protection action starting signal is detected and is in a locking state, detecting a bus state, starting a follow-up jump when no-voltage and no-current of the bus of the section are detected, sending a follow-up jump signal, and tripping a relevant isolating switch of the bus of the section to isolate faults after the follow-up jump is performed after self-healing tripping time;
when no bus differential protection action start signal is detected, the bus fault is positioned to the section and the bus fault signal is in a locking state, the bus state is detected, when no-voltage and no-current of the section of bus are detected, positioning tripping is started, a positioning tripping signal is sent out, the tripping action is positioned after self-healing tripping time, and the section of bus related isolating switch is tripped to isolate the fault.
2. The bus fault isolation method for self-healing of a distribution network according to claim 1, wherein the bus non-voltage and non-current refers to the bus non-voltage, the incoming line interval non-current, the outgoing line interval non-current and the sectionalized interval non-current of the section.
3. The method for isolating bus faults of self-healing of a distribution network according to claim 1, wherein the step-out of the bus-related isolating switch of the section refers to step-out of an incoming line interval, an outgoing line interval, a sectionalized interval and a small power line interval switch and step-out of a side switch.
4. A method for isolating bus faults with self-healing distribution network according to any one of claims 1 to 3, wherein the bus differential protection action on signal is unlocked when no voltage or current is detected on the bus of the section within the whole set of reset time, a follow-up signal is detected after the follow-up is started or the follow-up action is detected.
5. A self-healing bus fault isolation method according to any one of claims 1 to 3, wherein the located bus fault signal is unlocked when no voltage or current is detected for the bus segment within the entire set of reset times, a locating trip signal is detected after a locating trip is initiated, or a locating trip action is detected.
6. The bus fault isolation system for the self-healing of the distribution network is characterized by comprising an intelligent distributed terminal, wherein the intelligent distributed terminal is in communication connection with an external bus protection device and is arranged on each switch station; the intelligent distributed terminal comprises an internal bus fault positioning element, an external signal detection element, a follow-up element and a positioning tripping element;
the internal bus fault positioning element is used for positioning the bus fault of the section;
the external signal detection element is used for detecting a bus differential protection action start-in signal of the external bus protection device;
the follow-up jump element is used for detecting a bus differential protection action start-in signal and detecting a bus state when the bus differential protection action start-in signal is in a locking state, starting the follow-up jump when no-voltage and no-current of the bus of the section are detected, sending a follow-up jump signal, and tripping the related isolating switch of the bus of the section to isolate faults after the follow-up jump is performed after self-healing tripping time;
the positioning tripping element is used for detecting the bus state when the bus differential protection action on signal is not detected, the bus fault is positioned at the section and the bus fault signal is in a locking state, starting positioning tripping when the section of bus is detected to be pressureless and no-current, sending a positioning tripping signal, positioning tripping after self-healing tripping time, and tripping the section of bus related isolating switch to isolate the fault.
7. The distribution network self-healing bus fault isolation system according to claim 6, wherein the bus non-voltage and non-current refers to the bus non-voltage, the incoming line interval non-current, the outgoing line interval non-current and the sectionalized interval non-current.
8. The self-healing bus fault isolation system according to claim 6, wherein the tripping of the bus-related disconnector of the present section refers to tripping of an incoming line interval, an outgoing line interval, a sectionalizing interval and a small power line interval switch and tripping of a side switch.
9. The self-healing bus fault isolation system according to any one of claims 6 to 8, wherein the bus differential protection action on signal is unlocked when no voltage no current, no follow-up signal or no follow-up action is detected after the follow-up is started for the entire set of reset times.
10. The distribution network self-healing bus fault isolation system according to any one of claims 6 to 8, wherein the located bus fault signal is unlocked when no voltage no current is detected for the bus segment for the entire set of return times, a location trip signal is detected after a location trip is initiated, or a location trip action is detected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311621489.XA CN117810927A (en) | 2023-11-29 | 2023-11-29 | Bus fault isolation method and system for self-healing of distribution network |
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| CN202311621489.XA CN117810927A (en) | 2023-11-29 | 2023-11-29 | Bus fault isolation method and system for self-healing of distribution network |
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