CN112564036B - Reclosing method and device - Google Patents
Reclosing method and device Download PDFInfo
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- CN112564036B CN112564036B CN202011510962.3A CN202011510962A CN112564036B CN 112564036 B CN112564036 B CN 112564036B CN 202011510962 A CN202011510962 A CN 202011510962A CN 112564036 B CN112564036 B CN 112564036B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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Abstract
The invention discloses a reclosing method and device. The reclosing method comprises the following steps: after the line fails and the switch in the station trips for the first time, the switch in the station is controlled to reclose for the first time after a first preset time, and the reclosing is not closed; entering the first time of whole group reset time countdown; in the first time of the whole group resetting time, if the fault is not relieved, the switches in the station trip for the second time, and after the voltage of all the switches outside the station is lost, the first time of switching-off is carried out after a first set time delay; after the in-station switch trips for the second time, the in-station switch is controlled to reclose for the second time after a second preset time; the off-station switch sequentially obtains electric switching-on along the direction of the line away from the transformer substation after the second set delay; entering a second time of integral group reset time countdown; and in the second whole group resetting time, if the resetting condition is met, the in-station switch is successfully overlapped. The invention can reduce the power failure time after failure, reduce the power failure range and improve the power supply reliability.
Description
Technical Field
The embodiment of the invention relates to the technical field of reclosing, in particular to a reclosing method and device.
Background
Along with the continuous improvement of the living standard of people, the electric equipment is continuously increased, higher requirements are put forward on the power supply reliability, the faults are required to be correctly and rapidly removed when the faults occur, and meanwhile, the power supply is rapidly recovered under the condition of transient faults.
Most faults of the overhead line are transient, most faults can be coincident or tested successfully without any treatment, and permanent faults are generally less than 10%. Therefore, after the short-circuit fault is removed by the relay protection action, the arc is automatically extinguished, and the insulation at the short-circuit can be automatically recovered in most cases. Therefore, the existing protection is usually provided with a reclosing after the off-site switch trips, so that the power supply reliability is improved, and the power failure loss is reduced. However, the existing reclosing strategy has simple logic, insufficient cooperation of switches inside and outside the station, larger power failure range after failure, limited reclosing mechanism and longer power failure time of users after failure. Therefore, under the existing reclosing strategy, the problems of long power failure time and large range after the fault exist.
Disclosure of Invention
The embodiment of the invention provides a reclosing method and a reclosing device, which are used for reducing the power failure time after failure, reducing the power failure range and improving the power supply reliability.
In a first aspect, an embodiment of the present invention provides a reclosing method, where the reclosing method includes:
after a line fails and a switch in a station trips for the first time, controlling the switch in the station to reclose for the first time after a first preset time, wherein reclosing of the switch in the station is not blocked; the first preset time is smaller than the voltage-losing switching-off time of the off-station switch;
entering the first time of whole group reset time countdown; judging whether the fault is relieved or not in the first whole group resetting time, if the fault is not relieved, tripping the switches in the station for the second time, and carrying out first switching-off after the voltage of all the switches outside the station is lost and a first set delay;
after the second tripping operation of the in-station switch, controlling the in-station switch to perform a second reclosing operation after a second preset time; the off-station switch sequentially obtains electric switching-on along the direction of the line away from the transformer substation after second set delay; wherein the second preset time is greater than the first set delay; the switch in the station performs the second reclosing and then enters the second whole group reset time countdown; and judging whether the reset condition is met or not in the second whole set of reset time, and if the reset condition is met, the in-station switch is successfully overlapped.
Optionally, the double electrical condition includes:
the fault is a transient fault and has recovered;
or the fault is a permanent fault, but the off-site switch at the fault position is switched off for the second time after the on-site switch is switched on, so that the fault is cut off.
Optionally, after the determining whether the duplicate condition is satisfied, the method further includes:
if the re-electricity condition is not met, setting the locking time of the switch in the station;
if the third trip occurs to the switch in the station after the locking time, the switch in the station is controlled to be reclosed for the third time after a third preset time; wherein the third preset time is greater than the second preset time;
entering a third time of integral group reset time countdown; and after the third time of the whole group resetting time is counted down, performing the whole group resetting.
Optionally, after the setting of the blocking time of the in-station switch, the method further comprises:
if the third trip occurs to the switch in the station within the locking time, controlling the reclosing locking of the switch in the station, and entering the third whole set of reset time countdown; and after the third time of the whole group resetting time is counted down, performing the whole group resetting.
Optionally, the locking time is set to be the time when the first off-site switch gets electrically closed in a direction away from the substation.
Optionally, the off-voltage switching-off time of the off-station switch is longer than the reclosing time of the upper power supply.
Optionally, the failure non-resolution includes:
the in-station switch is overlapped with the fault when reclosing for the first time;
or after the first reclosing of the switch in the station is successful, the fault occurs again in the first whole group of reset time.
Optionally, after the determining whether the fault is released, the method further includes:
and if the fault is relieved, the in-station switch is successfully overlapped, and after the first group resetting time countdown is finished, the group resetting is carried out.
In a second aspect, an embodiment of the present invention provides a reclosing device, where the reclosing device includes:
the first reclosing module is used for controlling the switch in the station to perform first reclosing after the circuit fails and the switch in the station trips for the first time through a first preset time, and the reclosing of the switch in the station is not locked; the first preset time is smaller than the voltage-losing switching-off time of the off-station switch;
the first time countdown module is used for entering the first time whole group of reset time countdown; judging whether the fault is relieved or not in the first whole group resetting time, if the fault is not relieved, tripping the switches in the station for the second time, and carrying out first switching-off after the voltage of all the switches outside the station is lost and a first set delay;
the second reclosing module is used for controlling the switch in the station to perform second reclosing after the switch in the station trips for the second time through a second preset time; the off-station switch sequentially obtains electric switching-on along the direction of the line away from the transformer substation after second set delay; wherein the second preset time is greater than the first set delay; the switch in the station performs the second reclosing and then enters the second whole group reset time countdown; and judging whether the reset condition is met or not in the second whole set of reset time, and if the reset condition is met, the in-station switch is successfully overlapped.
Optionally, the reclosing device further includes:
the locking time setting module is used for setting the locking time of the switch in the station if the re-electricity condition is not met after the re-electricity condition is judged to be met;
the third reclosing module is used for controlling the in-station switch to perform third reclosing after a third preset time is passed if the in-station switch trips after the locking time is passed; wherein the third preset time is greater than the second preset time;
the whole group reset module is used for entering the third whole group reset time countdown; and after the third time of the whole group resetting time is counted down, performing the whole group resetting.
According to the reclosing method provided by the embodiment of the invention, after a circuit fails and the in-station switch trips for the first time, before the off-station switch loses pressure and opens, the in-station switch is controlled to conduct the first reclosing, the on-station switch is quickly overlapped once, the processes of losing pressure and opening the off-station switch and gradually getting a point to close the off-station switch are not needed, and the action speed of the in-station switch is accelerated. If the fault is released at this time, the off-site switch can be prevented from operating for a plurality of times, and the power failure range is limited in the transformer substation. After the first reclosing, the reclosing of the switch in the station is not locked, if the fault is not released in the first whole group resetting time, the switch in the station trips for the second time, the switch outside the station breaks off for the first time, and after the switch outside the station breaks off successfully, the switch in the station is controlled to conduct the second reclosing, so that the last step of action is completed when each step of action is started. And the protection system can react again to the failure of the first reclosing or the false action of the first reclosing by setting the second reclosing, so that the protection accuracy is ensured. After the secondary reclosing is completed, the off-station switches are sequentially powered on along the direction of the line away from the transformer substation, so that the line gradually recovers power supply. Therefore, compared with the prior art, the embodiment of the invention can correctly and rapidly cut off faults by orderly matching the reclosing of the switch in the station and the switch outside the station and utilizing the secondary reclosing of the switch in the station, reduce the power failure time after the faults, reduce the power failure range and improve the power supply reliability.
Drawings
Fig. 1 is a schematic flow chart of a reclosing method according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of another reclosing method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a reclosing device according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
The embodiment of the invention provides a reclosing method which can be executed by a reclosing device and is suitable for protecting the action of a system when a power grid line breaks down. Fig. 1 is a schematic flow chart of a reclosing method according to an embodiment of the present invention. Referring to fig. 1, the reclosing method includes the steps of:
s110, after the in-station switch fails on the line and trips for the first time, the in-station switch is controlled to reclose for the first time after a first preset time, and reclosing of the in-station switch is not locked.
The reclosing method can be used for various faults on transmission lines (such as 10kV distribution lines) in various links of power systems, such as transient faults caused by insulator surface flashover caused by lightning, short-time line collision caused by branch discharge of the lines, high wind and bird damage and the like, and permanent faults caused by metallic connection of the lines and iron towers and the like. The in-station switch may be a switching device such as a circuit breaker capable of cutting off fault current, and may be tripped automatically when a fault occurs, set by the controller for a set time, and be switched on or off after the set time, or be switched on or off by the controller. For example, in this embodiment, when a fault occurs on a line, the in-station switch automatically trips for the first time to disconnect the substation from the faulty line.
The first preset time is the setting time of the first reclosing of the in-station switch, the timing is started after the first tripping of the in-station switch is finished, and the in-station switch is controlled to reclose for the first time after the first preset time. Optionally, the first preset time is smaller than the voltage-losing switching-off time of the off-station switch, so that the first reclosing is realized before the off-station switch is switched off, if the fault is released at the moment, the circuit can quickly resume operation without undergoing the processes of the off-station switch for voltage losing switching-off and step-by-step power-on, the whole reclosing process is reduced to a few seconds from nearly 2 minutes, meanwhile, the off-station switch is prevented from operating for many times, and if the off-station switch is not reliably power-on, the back-end power failure can be caused. The first preset time may be, for example, 1.5-3.0 seconds.
Like the in-station switch, the off-station switch may also be a switching device with an on-off capability, such as a circuit breaker or a load switch, and the off-station switch is illustratively an automatic switch on the off-station main line, which is advantageous for isolating faults in a smaller range. All off-station switches are sequentially distributed on a line outside the transformer substation, when the off-station switches are tripped, the off-station switches start to lose electricity, the voltage loaded on the off-station switches start to decrease, and when the voltage decreases to a certain proportion (for example, the voltage decreases by 30%), the off-station switches are opened. The voltage-losing and switching-off time of the off-site switch needs to be matched with the reclosing time of the upper power supply. Generally, the higher the voltage level, the shorter the power reclosing time. The voltage-losing and opening time of the off-station switch is longer than the reclosing time of the upper power supply. For example, on a 10kV line, the voltage-losing switching-off time needs to be considered to be matched with the 35kV-220kV reclosing time, and the switching-off time can be set to be 3.0-8.0 seconds. Preferably, the first preset time is 1.0-2.0 seconds shorter than the voltage-losing and switching-off time, so that the arrangement can ensure that all off-site switches reliably complete the first switching-off when the on-site switches perform the first reclosing, and the reliability of the actions of each step is ensured.
The reclosing of the in-station switch is not locked, so that the in-station switch can effectively perform secondary reclosing when the fault is not released after the first reclosing, and the problem that the in-station switch cannot correctly respond to the fault due to the locking reclosing after the first reclosing caused by in-station protection misoperation can be avoided.
S120, entering the first whole group of reset time countdown; and judging whether the fault is relieved or not in the first whole group resetting time, if the fault is not relieved, tripping the switches in the station for the second time, and carrying out first switching-off after the voltage of all the switches outside the station is lost and the first set time delay.
When the switch in the station completes the first reclosing, the first whole group reset time countdown is started. The full set of return times is typically greater than 15 seconds depending on the number of off-site switches, and the first full set of return times may preferably be set to 60-120 seconds. In the first time of the whole group of resetting, if the fault still exists or the fault occurs again, the switch in the station automatically trips for the second time, and the switch outside the station automatically opens after the first set delay (Tf). The first setting delay (denoted as Tf) may be set according to the actual situation. Under the condition, the operation of the next step can be carried out after all off-site switches are also separated, otherwise, the second reclosing is possibly directly switched on to the fault, the off-site automatic switch cannot be utilized to selectively isolate the fault in the minimum range, and the power failure range is enlarged.
S130, after the in-station switch trips for the second time, controlling the in-station switch to reclose for the second time after a second preset time; the off-station switch sequentially obtains electric switching-on along the direction of the line away from the transformer substation after the second set delay; the second preset time is longer than the first preset time delay; after the switch in the station performs the second reclosing, the second whole group reset time countdown is started; and in the second whole group resetting time, judging whether the resetting condition is met, and if the resetting condition is met, successfully resetting the switch in the station.
The second set delay (recorded as Th) of the off-site switch to be powered on and off can be set according to actual requirements. The second preset time is larger than the first set delay and larger than the voltage-losing and switching-off time of the off-site switch. Preferably, the second preset time is simultaneously longer than the reclosing charging time, the switch spring energy storage time and the off-voltage switching-off time of the off-station switch, so as to ensure that the second reclosing can be successfully performed, for example, 7.0-10.0 seconds. After the station switch finishes the second reclosing, the off-station switch gradually gets the electric closing after the second set time delay and enters the second whole group reset countdown. The off-site switch is powered on in a direction from a position close to the transformer substation to a position far away from the transformer substation, and can be quickly tripped out to cut off the fault when one off-site switch is on the fault. Optionally, the second full set of return times is equal to the first full set of return times.
According to the reclosing method provided by the embodiment of the invention, after a circuit fails and a switch in the station trips for the first time, before the switch outside the station loses voltage and breaks the gate, the switch in the station is controlled to conduct the first reclosing, the reclosing is rapidly conducted once, the processes of losing voltage and breaking the gate and getting the power to be closed step by the switch outside the station are not needed, and the reclosing speed of the whole circuit is accelerated. If the fault is relieved at this time, the off-station switch can be prevented from operating for a plurality of times, the re-power time is reduced, and the power failure of the rear-section line caused by the fact that the off-station switch cannot be reliably switched on is avoided. After the first reclosing, the reclosing of the switch in the station is not locked, if the fault is not released in the first whole group resetting time, the switch in the station trips for the second time, the switch outside the station breaks off for the first time, and after the switch outside the station breaks off successfully, the switch in the station is controlled to conduct the second reclosing, so that the last step of action is completed when each step of action is started. After the secondary reclosing is completed, the off-station switches are sequentially powered on along the direction of the line away from the transformer substation, so that the line gradually recovers power supply. Therefore, the embodiment of the invention can correctly and rapidly cut off faults by orderly matching the reclosing of the switch in the station and the reclosing of the switch outside the station and utilizing the secondary reclosing of the switch in the station, reduce the power failure time after the faults, reduce the power failure range and improve the power supply reliability.
In addition to the above embodiments, the case where the failure is not resolved may be various, and several cases will be described below, but the present application is not limited thereto.
In one embodiment, optionally, the fault does not release the intra-bay switch to coincide with the fault when the first reclosing is performed; at this time, the in-station switch is accelerated to trip (trip without selective action) to ensure rapid fault isolation, and then is corrected by reclosing for the second time.
In yet another embodiment, optionally, failure is not released, which means that the failure occurs again within the first entire set of reset times after the first reclosing of the switch in the station is successful. After the fault occurs again, the switch in the station trips again automatically.
On the basis of the above embodiments, optionally, the duplicate condition includes: the fault is a transient fault and has recovered; or the fault is a permanent fault, but the off-site switch at the fault is switched off for the second time after the power-on switch is switched on, so that the fault is cut off. When the instantaneous fault is recovered, after all off-site switches are powered on and switched off, full-line power restoration is realized. When the fault is a permanent fault, the off-site switch is utilized to isolate the fault section and recover the power supply of the non-fault section. And the process of the off-site switch for the second time is acceleration.
Fig. 2 is a schematic flow chart of another reclosing method according to an embodiment of the present invention. Referring to fig. 2, in the above embodiments, if the reclosing condition is not satisfied after the second reclosing is completed, it is also possible to analyze whether the third reclosing of the in-station switch is performed. Optionally, the reclosing method includes the following steps:
s210, after the in-station switch fails on the line and trips for the first time, the in-station switch is controlled to reclose for the first time after a first preset time, and reclosing of the in-station switch is not locked.
S220, entering the first time of whole group reset time countdown.
S230, judging whether the fault is relieved in the first whole group resetting time; if yes, S2C0 is executed, and if not, S240 is executed.
If the fault is relieved, the switch in the station is successfully overlapped, and after the countdown of the first group resetting time is finished, the group resetting is carried out, and all the protection devices are reset to the state before the fault so as to ensure that the protection system can reliably act when the next fault occurs.
S240, tripping the switches in the station for the second time, and switching off the switches for the first time after the first set delay after all the switches outside the station lose voltage.
S250, after a second preset time, controlling the switch in the station to reclose for the second time.
S260, entering a second whole group of reset time countdown; and after the second set delay, the off-station switches are sequentially electrically switched on along the direction of the line away from the transformer substation.
S270, judging whether the reset condition is met in the second whole set of reset time; if yes, S2D0 is executed, otherwise S280 is executed.
Optionally, not satisfying the duplicate electrical condition includes: the off-station switch is closed on the fault line section, and can not be accelerated after closing, so that the on-station switch is tripped for the third time.
S280, setting the locking time of the switch in the station.
Optionally, the blocking time is set to be the time when the first off-site switch gets electrically closed in a direction away from the substation. The reason for this is that in the process of gradually getting the electricity to close the off-site switch, the off-site switch close to the transformer substation gets the electricity first, so if the on-site switch trips for the third time before the first off-site switch gets the electricity to close, the fault is indicated to be located in the site or in the area very close to the transformer substation, and the third reclosing, namely the reclosing locking, is not needed at this time, and the fault processing is performed. Therefore, the reclosing closing time is matched with the time when the first off-site switch gets electrically closed.
S290, judging whether the time of the third trip of the switch in the station is within the locking time; if yes, executing S2B0, and if not, executing S2A0.
If the switch in the station trips for the third time within the locking time, the fault is located in the near station area, and the impact of the fault on the system is too large, in this case, especially when the fault is a near-end short-circuit fault, if multiple overlapping occurs, the impact on the system and equipment is larger. Therefore, the reclosing is not needed again, and the third reclosing should be blocked. Therefore, after the third trip, the reclosing lock of the switch in the station needs to be controlled so that the switch cannot reclose again, the reclosing discharges, the whole action process is finished, and the third whole group reset time countdown is entered; and after the third time of the group resetting time is counted down, performing the group resetting.
S2A0, after a third preset time, controlling the switch in the station to reclose for the third time.
At this time, before the second whole set of reset countdown is finished, the in-station switch trips for the third time to prove that the fault is not in the near station area, and then the off-station switch of the fault line section is closed by locking and isolates the fault, and the non-fault line section transmits power normally. Therefore, the switch in the station can be controlled to reclose for the third time under the condition so as to ensure that the non-fault line section is normally powered.
The third preset time is the setting time of the third reclosing. The third preset time is longer than the second preset time, so that all the preamble actions are finished before the third reclosing, such as the second switching-off of the off-station switch. In addition, the setting of the third preset time also needs to consider the reclosing charging time and the switch spring energy storage time so as to ensure that the third reclosing can be effectively performed. The third preset time may be set to 10.0 seconds and more, for example.
S2B0, entering a third whole group of reset time countdown; and after the third time of the group resetting time is counted down, performing the group resetting.
After the third reclosing of the switch in the station is completed, the action of the round of protection is ended no matter successful or failed, and the third whole group of reset time countdown is entered; and after the counting down of the third group resetting time is finished, performing the group resetting, and entering the next round of action preparation. Alternatively, the third full set of return times may be set to be greater than the first full set of return times.
S2C0, the in-station switch is successfully overlapped, and the whole group reset is carried out after the first whole group reset time countdown is finished.
S2D0, the in-station switch is successfully overlapped, and after the counting down of the second group resetting time is finished, the group resetting is carried out.
In summary, in the embodiment of the invention, after the first reclosing, the second reclosing and the third reclosing of the switch in the station are locked, the switch in the station enters the whole group of reset countdown, and the first reclosing and the second reclosing of the switch in the station are tripped before the countdown is finished, the time counting is stopped, and the reaction to the faults is carried out; and after the countdown is finished, the whole group of resetting is carried out, and the protection action of the round is finished no matter what the fault state is.
According to the reclosing method provided by the embodiment of the invention, through the cooperation of the reclosing of the switch in the station and the switch outside the station, the reclosing is designed for three times, so that the fault can be further ensured to be correctly removed, the position of the fault can be judged, and corresponding processing is performed.
It should be noted that, no matter in any stage of the reclosing strategy, for example, when the first, second or third line faults lead to tripping, if the fault current is greater than a set value (generally, the short-circuit current value of the near-zone three-phase of the transformer substation), the reclosing is locked, and the action process is ended; otherwise, the operation is performed according to the set logic. The current and time of the switch protection tripping in the first, second and third secondary stations can be respectively set. The first, second or third reclosing can be respectively set whether to be put into operation or not. The first reclosing can be selected to be put into or skipped according to the fault type, and if the first reclosing is selected to be 'not put into' or 'skipped', the second reclosing action flow is directly entered.
The embodiment of the invention also provides a reclosing device which can be used for realizing the reclosing method provided by the embodiments, and has the corresponding beneficial effects.
Fig. 3 is a schematic structural diagram of a reclosing device according to an embodiment of the present invention. Referring to fig. 3, the reclosing device includes: a first reclosing module 110, a first countdown module 120, and a second reclosing module 130.
The first reclosing module 110 is configured to control the switch in the station to perform a first reclosing after a first trip occurs in the switch in the station after a line fails, where the reclosing of the switch in the station is not blocked; the first preset time is smaller than the voltage-losing switching-off time of the off-site switch.
The first countdown module 120 is configured to enter a first entire set of return time countdown; and judging whether the fault is relieved or not in the first whole group resetting time, if the fault is not relieved, tripping the switches in the station for the second time, and carrying out first switching-off after the voltage of all the switches outside the station is lost and the first set time delay.
The second reclosing module 130 is configured to control the switch in the station to perform a second reclosing after the switch in the station trips for a second time, and after a second preset time elapses; the off-station switch sequentially obtains electric switching-on along the direction of the line away from the transformer substation after the second set delay; the second preset time is longer than the first preset time delay; after the switch in the station performs the second reclosing, the second whole group reset time countdown is started; and in the second whole group resetting time, judging whether the resetting condition is met, and if the resetting condition is met, successfully resetting the switch in the station.
On the basis of the above embodiments, optionally, the reclosing device further includes: the device comprises a locking time setting module, a third reclosing module and a whole group resetting module.
And the locking time setting module is used for setting the locking time of the switch in the station after judging whether the re-electrifying condition is met or not and if the re-electrifying condition is not met.
The third reclosing module is used for controlling the in-station switch to perform third reclosing after a third preset time passes if the in-station switch trips after the locking time passes; wherein the third preset time is greater than the second preset time.
The whole group reset module is used for entering the third whole group reset time countdown; and after the third time of the whole group resetting time is counted down, performing the whole group resetting.
On the basis of the above embodiments, optionally, the whole set of reset modules is further configured to control reclosing and locking of the in-station switch and enter a third whole set of reset time countdown if the in-station switch trips for the third time within the set of reset time after the set of the in-station switch has been closed; and after the third time of the group resetting time is counted down, performing the group resetting.
On the basis of the above embodiments, optionally, the whole group resetting module is further configured to, after judging whether the fault is released, perform the whole group resetting after the first whole group resetting time countdown is completed if the fault is released and the in-station switch is successfully overlapped.
On the basis of the above embodiments, optionally, the whole group resetting module is further configured to perform whole group resetting after the second whole group resetting time countdown is finished after judging that the reset condition is met and the in-station switch is successfully overlapped.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (8)
1. A reclosing method, comprising:
after a line fails and a switch in a station trips for the first time, controlling the switch in the station to reclose for the first time after a first preset time, wherein reclosing of the switch in the station is not blocked; the first preset time is smaller than the voltage-losing switching-off time of the off-station switch;
entering the first time of whole group reset time countdown; judging whether the fault is relieved or not in the first whole group resetting time, if the fault is not relieved, tripping the switches in the station for the second time, and carrying out first switching-off after the voltage of all the switches outside the station is lost and a first set delay;
after the second tripping operation of the in-station switch, controlling the in-station switch to perform a second reclosing operation after a second preset time; the off-station switch sequentially obtains electric switching-on along the direction of the line away from the transformer substation after second set delay; wherein the second preset time is greater than the first set delay; the switch in the station performs the second reclosing and then enters the second whole group reset time countdown; judging whether the reset condition is met or not in the second whole set of reset time, and if the reset condition is met, the in-station switch is successfully overlapped;
further comprises:
if the re-electricity condition is not met, setting the locking time of the switch in the station;
if the third trip occurs to the switch in the station after the locking time, the switch in the station is controlled to be reclosed for the third time after a third preset time; wherein the third preset time is greater than the second preset time;
entering a third time of integral group reset time countdown; and after the third time of the whole group resetting time is counted down, performing the whole group resetting.
2. The reclosing method according to claim 1, wherein the reclosing condition includes:
the fault is an instantaneous fault, and the line has resumed transmitting power;
or the fault is a permanent fault, but the off-site switch at the fault position is switched off for the second time after the on-site switch is switched on, so that the fault is cut off.
3. The reclosing method according to claim 1, further comprising, after the setting of the lock time of the in-station switch:
if the third trip occurs to the switch in the station within the locking time, controlling the reclosing locking of the switch in the station, and entering the third whole set of reset time countdown; and after the third time of the whole group resetting time is counted down, performing the whole group resetting.
4. The reclosing method according to claim 1, wherein the lockout time is set to a time when a first off-site switch is electrically closed in a direction away from the substation.
5. The reclosing method according to claim 1, wherein the off-voltage switching-off time of the off-station switch is longer than the time of the upper power reclosing.
6. The reclosing method according to claim 1, wherein the failure not being released includes:
the in-station switch is overlapped with the fault when reclosing for the first time;
or after the first reclosing of the switch in the station is successful, the fault occurs again in the first whole group of reset time.
7. The reclosing method according to claim 1, further comprising, after the determining whether the fault is released:
and if the fault is relieved, the in-station switch is successfully overlapped, and after the first group resetting time countdown is finished, the group resetting is carried out.
8. A reclosing device, comprising:
the first reclosing module is used for controlling the switch in the station to perform first reclosing after the circuit fails and the switch in the station trips for the first time through a first preset time, and the reclosing of the switch in the station is not locked; the first preset time is smaller than the voltage-losing switching-off time of the off-station switch;
the first time countdown module is used for entering the first time whole group of reset time countdown; judging whether the fault is relieved or not in the first whole group resetting time, if the fault is not relieved, tripping the switches in the station for the second time, and carrying out first switching-off after the voltage of all the switches outside the station is lost and a first set delay;
the second reclosing module is used for controlling the switch in the station to perform second reclosing after the switch in the station trips for the second time through a second preset time; the off-station switch sequentially obtains electric switching-on along the direction of the line away from the transformer substation after second set delay; wherein the second preset time is greater than the first set delay; the switch in the station performs the second reclosing and then enters the second whole group reset time countdown; judging whether the reset condition is met or not in the second whole set of reset time, and if the reset condition is met, the in-station switch is successfully overlapped;
further comprises:
the locking time setting module is used for setting the locking time of the switch in the station if the re-electricity condition is not met after the re-electricity condition is judged to be met;
the third reclosing module is used for controlling the in-station switch to perform third reclosing after a third preset time is passed if the in-station switch trips after the locking time is passed; wherein the third preset time is greater than the second preset time;
the whole group reset module is used for entering the third whole group reset time countdown; and after the third time of the whole group resetting time is counted down, performing the whole group resetting.
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| CN108802569A (en) * | 2018-06-14 | 2018-11-13 | 贵州电网有限责任公司 | Distribution circuit single-phase earth fault positioning based on voltage and current type and partition method |
| CN109038475A (en) * | 2018-08-31 | 2018-12-18 | 广东电网有限责任公司 | A kind of distribution network overhead line self-recovery method based on voltage time logic |
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