CN114050546A - Reclosing method for cooperatively starting network access line of small hydropower station - Google Patents
Reclosing method for cooperatively starting network access line of small hydropower station Download PDFInfo
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- CN114050546A CN114050546A CN202111362837.7A CN202111362837A CN114050546A CN 114050546 A CN114050546 A CN 114050546A CN 202111362837 A CN202111362837 A CN 202111362837A CN 114050546 A CN114050546 A CN 114050546A
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- 239000000203 mixture Substances 0.000 claims 1
- 239000002994 raw material Substances 0.000 claims 1
- 238000012986 modification Methods 0.000 description 5
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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
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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
- H02H7/28—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 for meshed systems
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Abstract
The invention discloses a reclosing method for starting a small hydropower station by matching with an internet access line, which comprises the following steps that in a distribution network line of the small hydropower station, the small hydropower station is connected into the distribution network line to operate by a T-shaped connection line, and a substation side circuit breaker S1 and a small hydropower side circuit breaker S2 are arranged on the line; the two sides of the distribution network equipment side and the user side supply power simultaneously, when a short circuit occurs to a distribution network line at any K point, a fault current I is simultaneously fed back to a line automatic switch, a transformer station side breaker S1 and a small hydropower station side breaker S2, the switches on the two sides are respectively tripped off after certain time delay according to different set protection setting values, and the small hydropower station is operated in an unleaved mode; when the switch is disconnected, the switch on the transformer substation side starts a reclosing switch, the instantaneous fault of the line is eliminated, and the reclosing switch is started successfully; and a small hydropower station circuit breaker S2 detects that a rear-end line is electrified at the same time, and the small hydropower station is on-line again after reclosing is started successfully.
Description
Technical Field
The invention relates to the technical field of power grid related equipment, in particular to a reclosing method for starting a small hydropower station through cooperation of an internet access line.
Background
Water resources in Guizhou network areas are rich, and small hydropower stations are connected into distribution network lines to operate frequently in a T-shaped connection mode. When the distribution network line has an instantaneous fault, the small hydropower station is on the internet, and the small hydropower station on-line can not be switched into reclosing operation according to the power grid dispatching operation regulation, so that a transformer substation side switch or a line automatic switch can not meet the requirement of reclosing, and even if the distribution network line has an instantaneous short-circuit fault, large-area power failure can be caused.
At present, user asset equipment in a Guizhou power grid area lacks specialized management, a circuit breaker with a protection function is not installed at a client, distribution network lines are frequently tripped due to faults of the client equipment, and the fault is difficult to find at the client; in the operation of a 10kV distribution network, the tripping frequency of an automatic switch of a 10kV distribution network line and a main switch at the side of a transformer substation caused by a client fault is more. The client assets are not maintained by professional personnel, so that faults are frequent. And because the client is not additionally provided with a breaker with a protection function, the fault override trip is caused, large-area power failure is caused, the power supply reliability is reduced, and the customer service satisfaction is reduced.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
In view of the existing problems, when a distribution network line has an instantaneous fault, a transformer substation side switch or a line automatic switch cannot meet the requirement of reclosing starting due to the fact that small hydropower stations are connected to the internet, and the invention is provided.
Therefore, the invention aims to provide a reclosing method for starting the small hydropower station by matching with an internet access line.
In order to solve the technical problems, the invention provides the following technical scheme: a method for starting reclosing by matching of a small hydropower station internet access line comprises the steps that in a distribution network line of the small hydropower station, the small hydropower station is connected into the distribution network line in a T-shaped connection mode to operate, a substation side circuit breaker S1 and a small hydropower station side circuit breaker S2 are arranged on the line, the distribution network equipment side and a user side are provided with power supplies at the same time, when the distribution network line is short-circuited at any K point, a fault current I is fed back to a line automatic switch, a substation side circuit breaker S1 and a small hydropower station side circuit breaker S2 at the same time, switches at the two sides are respectively tripped off after certain time delay, and the small hydropower station is disconnected to operate; when the switch is disconnected, the switch on the transformer substation side starts a reclosing switch, the line fault is eliminated, and the reclosing switch is started successfully; and a small hydropower station circuit breaker S2 detects that a rear-end line is electrified at the same time, and the small hydropower station is on-line again after reclosing is started successfully.
As an optimal scheme of the method for starting reclosing by matching the small hydropower station network access line, the method comprises the following steps: and a breaker with protection is installed at the T contact of the user side, and when instantaneous failure occurs in equipment of the user side, reclosing is started after a certain time delay.
As an optimal scheme of the method for starting reclosing by matching the small hydropower station network access line, the method comprises the following steps: the transformer substation side circuit breaker S1 and the small hydropower side circuit breaker S2 are power output ends, and the circuit breakers on the two sides are protected and can be started to trip at the same time.
As an optimal scheme of the method for starting reclosing by matching the small hydropower station network access line, the method comprises the following steps: when transient short-circuit fault occurs, the substation side circuit breaker S1 can judge that the line at the outlet end is not pressed through PT1, reclosing is started, the line is electrified, PT2 also has pressure, the small hydropower side circuit breaker S2 can judge that the line at the outlet end has pressure through PT2, reclosing is started, and the line is automatically powered normally.
As an optimal scheme of the method for starting reclosing by matching the small hydropower station network access line, the method comprises the following steps: when a permanent short-circuit fault occurs, the substation side circuit breaker S1 judges that a line end circuit is not pressurized through PT1, reclosing is started, after the substation side circuit breaker S1 fails to start reclosing, the PT2 does not have pressure, and the small hydropower side circuit breaker S2 does not start reclosing.
As an optimal scheme of the method for starting reclosing by matching the small hydropower station network access line, the method comprises the following steps: when a transient fault occurs at the user side, the breaker at the user side starts one reclosing after a certain time delay, and the equipment recovers normal power supply.
As an optimal scheme of the method for starting reclosing by matching the small hydropower station network access line, the method comprises the following steps: when a permanent fault occurs at the user side, the user side breaker will be tripped again after starting a reclosing switch once, and the safe operation of the distribution network cannot be influenced after tripping.
As an optimal scheme of the method for starting reclosing by matching the small hydropower station network access line, the method comprises the following steps: the breaker installed at the T contact of the user side is a breaker with a current and voltage type protection function.
As an optimal scheme of the method for starting reclosing by matching the small hydropower station network access line, the method comprises the following steps: the voltage original of the substation side circuit breaker S1 device disappears through PT voltage, and the reclosing logic of the protection device starts when the voltage of the reclosing device disappears; the voltage original part of the protection device at the side of the small hydropower station is charged with voltage through PT, and then reclosing logic can be started.
The invention has the beneficial effects that: according to the invention, by utilizing the time delay protection functions of fault tripping, power on switching-on and reclosing of the small hydropower station breaker, when the distribution network line has a fault and the power is off, the small hydropower station automatically disconnects the network to operate; when the fault of the distribution network line disappears instantly and the normal operation is recovered, the circuit breaker of the small hydropower station detects that the line side has pressure, automatically closes the switch, and operates on the internet again. The problem that a transformer substation side switch does not have the function of switching on and switching off in an internet line with small hydropower stations is solved.
Meanwhile, a circuit breaker with a voltage and current type protection function is installed at a client property T contact, a protection step-by-step control mode is utilized, when a fault occurs in the operation of client equipment, a fault line or equipment is cut off on the spot, and the normal operation of other lines is not influenced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
fig. 1 is a flow chart of the action condition of a breaker in a short circuit when the network access line of a small hydropower station is matched with a reclosing method for starting reclosing.
FIG. 2 is a flow chart of the reclosing process started by the cooperation of the network access line of the small hydropower station in the method for starting reclosing by the cooperation of the network access line of the small hydropower station
FIG. 3 is a logic flow chart of a distribution network line switch and a small hydropower station reclosing switch according to the method for starting reclosing by matching the small hydropower station network line
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Furthermore, the present invention is described in detail with reference to the drawings, and in the detailed description of the embodiments of the present invention, the cross-sectional view illustrating the structure of the device is not enlarged partially according to the general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Example 1
Referring to fig. 1-3, a method for starting reclosing by matching a small hydropower station network access line comprises the steps that in a distribution network line of the small hydropower station, the small hydropower station is connected with the distribution network line to operate by a T-shaped connection line, a substation side circuit breaker S1 and a small hydropower station side circuit breaker S2 are arranged on the line, power is supplied to both sides of a distribution network device side and a user side, when the distribution network line is short-circuited at any K point, a fault current I is fed back to a line automatic switch, a substation side circuit breaker S1 and a small hydropower station side circuit breaker S2 at the same time, the switches on both sides are respectively tripped off by a certain time delay according to different set protection setting values, and the small hydropower station is tripped to operate; when the switch is disconnected, the switch on the transformer substation side starts a reclosing switch, the instantaneous fault of the line is eliminated, and the reclosing switch is started successfully; and a small hydropower station circuit breaker S2 detects that a rear-end line is electrified at the same time, and the small hydropower station is on-line again after reclosing is started successfully.
Specifically, by utilizing the voltage-loss tripping, power-on switching-on and reclosing time-delay protection functions of a small hydropower station circuit breaker, when the power failure occurs in the distribution network line, the small hydropower station automatically disconnects the network to operate; when the distribution network line is cleared and recovered to normally operate, the circuit breaker of the small hydropower station detects that the line side has pressure, automatically closes the switch, and operates on the Internet again. In a distribution network line of a small hydropower station, the small hydropower station is connected with the distribution network line to operate in a T-shaped connection mode, a substation side circuit breaker S1 and a small hydropower station side circuit breaker S2 are arranged on the line, and power is supplied to a distribution network device side and a user side at the same time.
When the distribution network line is short-circuited at any point K, the fault current I is simultaneously fed back to the line automatic switch, the substation side breaker S1 and the small hydropower station side breaker S2, the switches on the two sides are respectively tripped off after certain time delay according to different set protection setting values, and the small hydropower station is operated in an unleaved mode; when the switch is disconnected, the switch on the transformer substation side starts a reclosing switch, the instantaneous fault of the line is eliminated, and the reclosing switch is started successfully; and a small hydropower station circuit breaker S2 detects that a rear-end line is electrified at the same time, and the small hydropower station is on-line again after reclosing is started successfully. The problem that a transformer substation side switch does not have the function of switching on and switching off in an internet line with small hydropower stations is solved.
Further, the small hydropower station circuit breaker S2 is detected synchronously. The term "to detect synchronization simply means that the switch is closed after detecting whether or not both ends of the switch satisfy synchronization conditions before closing the switch. When the circuit breaker is reclosed, the circuit has two conditions of electrification and non-electrification. If the line is electrified (has voltage), in order to reduce the voltage difference at two sides of the circuit breaker during closing, synchronous coincidence is adopted; if the line is not electrified (no voltage), non-synchronous coincidence is adopted.
Furthermore, a circuit breaker with a voltage and current type protection function is installed at a client property T contact, a protection step-by-step control mode is utilized, when a fault occurs in the operation of client equipment, a fault line or equipment is cut off on the spot, and the normal operation of other lines is not influenced.
Example 2
Referring to fig. 1-3, this embodiment differs from the first embodiment in that: the transformer substation side circuit breaker S1 and the small hydropower side circuit breaker S2 are arranged as power output ends, and the circuit breakers on the two sides are provided with protection and can be started to trip at the same time. When transient short-circuit fault occurs, the substation side circuit breaker S1 can judge that the line at the outlet end is not pressed through PT1, reclosing is started, the line is electrified, PT2 also has pressure, the small hydropower side circuit breaker S2 can judge that the line at the outlet end has pressure through PT2, reclosing is started, and the line is automatically powered normally. When a permanent short-circuit fault occurs, the substation side circuit breaker S1 judges that a line end circuit is not pressurized through PT1, reclosing is started, after the substation side circuit breaker S1 fails to start reclosing, the PT2 does not have pressure, and the small hydropower side circuit breaker S2 does not start reclosing. The voltage original of the substation side breaker S1 device disappears through PT voltage, and the reclosing logic of the protection device starts when the voltage of the reclosing device disappears; the voltage original part of the protection device at the side of the small hydropower station is charged with voltage through PT, and then reclosing logic can be started.
A breaker with protection is installed at a T contact of a user side, and when instantaneous failure occurs to equipment of the user side, reclosing is started with a certain delay. When a transient fault occurs at the user side, the breaker at the user side starts one reclosing after a certain time delay, and the equipment recovers normal power supply. When a permanent fault occurs at the user side, the breaker at the user side trips again after starting a reclosing switch once, and the safe operation of a distribution network cannot be influenced after tripping. The circuit breaker installed at the T-contact on the customer side is a circuit breaker having a protection function of a current-voltage type.
Specifically, in this embodiment, the substation side circuit breaker S1, the small hydropower side circuit breaker S2 are set as the power output end, and both side circuit breakers are provided with protection and can be tripped by starting at the same time.
When transient short-circuit fault occurs, the substation side breaker S1 judges that the line at the outlet end is not voltage through PT1, reclosing is started, and the line is electrified;
the PT2 is pressed, the small hydropower side circuit breaker S2 judges that the line at the outlet end is pressed through the PT2, reclosing is started, and the line is automatically powered normally.
Meanwhile, a reclosing device or a spare power automatic switching device with the synchronous grid connection detection function is installed in the small hydropower station, when instantaneous faults occur in a distribution network line, a transformer substation side switch or a line automatic switch trips, the small hydropower station is supposed to operate continuously, the protection constant value of a small hydropower station side circuit breaker is reached within a certain time along with the linear rising of load current, the small hydropower station circuit breaker is started in a protection mode, and the small hydropower station is operated in an off-line mode. At the moment, the main network rear end line is not pressurized, the switch is in the disconnection position, and the substation side switch or the line automatic switch starts a reclosing switch. After a certain time delay, the circuit breaker at the side of the small hydropower station starts reclosing and the small hydropower station is switched on the internet again to operate.
When a permanent short-circuit fault occurs, the substation side breaker S1 judges that a line at a line end is not voltage through PT1, and then reclosing is started;
after the substation side circuit breaker S1 fails to start reclosing, PT2 does not have pressure, and the small hydropower side circuit breaker S2 does not start reclosing.
Further, PT refers to a voltage transformer, which is a converting device for converting a high voltage on a primary side into a rated voltage of 100V suitable for a meter or a relay. The working principle of the electromagnetic voltage transformer is the same as that of the transformer. When measuring the large voltage of alternating current, in order to be able to measure safely and connect a transformer (connected at the input end of the transformer) in parallel between the live wire and the ground wire, the output end of the transformer is connected to a voltmeter, because the number of turns of the input coil is greater than that of the output coil, the output voltage is less than the input voltage, and the voltage transformer is the step-down transformer. The secondary voltage converted by the voltage transformer is 57.77V and is supplied to a protection device of the circuit breaker, a voltage element of an S1 device of the circuit breaker on the transformer substation side disappears through PT voltage, reclosing of the protection device disappears through voltage, and then reclosing logic can be started, otherwise, the voltage element of the protection device on the small hydropower station side has voltage through PT, and then reclosing logic can be started. In the embodiment, the PT1 and PT2 voltage transformers adopt JSZW-10WFR series three-phase voltage transformers. The S1 and S2 circuit breakers adopt outdoor high-voltage alternating current vacuum circuit breakers of CLW20-12 series.
Furthermore, a breaker with protection is installed at a T contact of the user side, and when instantaneous faults occur to equipment of the user side, reclosing is started after a certain time delay. When a transient fault occurs at the user side, the breaker at the user side starts one reclosing after a certain time delay, and the equipment recovers normal power supply. When a permanent fault occurs at the user side, the breaker at the user side trips again after starting a reclosing switch once, and the safe operation of a distribution network cannot be influenced after tripping. The circuit breaker installed at the T-contact on the customer side is a circuit breaker having a protection function of a current-voltage type.
Simultaneously, have the protect function circuit breaker of current voltage type at customer property right T contact installation, can satisfy all circuits like this and possess the reclosing lock function, utilize the reclosing lock protect function simultaneously, solve the online circuit that has little water and electricity, transformer substation side switch does not possess the problem that drops into the reclosing lock function, and its effect has following performance: large-area power failure caused by transient faults is reduced; by utilizing the synchronous detection and delay functions of reclosing, the problem that the reclosing can not be started by an internet line of a small hydropower station is solved; the power supply reliability is improved, and the customer satisfaction is improved.
It is important to note that the construction and arrangement of the present application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperatures, pressures, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the present invention is not limited to a particular embodiment, but extends to various modifications that nevertheless fall within the scope of the appended claims.
Moreover, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those unrelated to the presently contemplated best mode of carrying out the invention, or those unrelated to enabling the invention).
It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, without undue experimentation.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (9)
1. A reclosing method for starting in cooperation with a small hydropower station internet access line is characterized by comprising the following steps: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
in a distribution network line of a small hydropower station, the small hydropower station is connected with the distribution network line in a T-shaped connection for operation, a substation side breaker S1 and a small hydropower station side breaker S2 are arranged on the line, power is supplied to both sides of a distribution network device side and a user side,
when the distribution network line is short-circuited at any point K, the fault current I is simultaneously fed back to the line automatic switch, the substation side breaker S1 and the small hydropower station side breaker S2, the switches on the two sides are respectively tripped, and the small hydropower stations are operated in an splitting mode;
when the switch is disconnected, the switch on the transformer substation side starts reclosing, the line fault is eliminated, and the reclosing is started successfully; and a small hydropower station circuit breaker S2 detects that a rear-end line is electrified at the same time, and the small hydropower station is on-line again after reclosing is started successfully.
2. The method for starting reclosing in cooperation with the network access line of the small hydropower station as claimed in claim 1, characterized in that: and a breaker with protection is installed at the T contact of the user side, and when instantaneous fault occurs to equipment at the user side, reclosing is started.
3. The method for starting reclosing in cooperation with the network access line of the small hydropower station as claimed in claim 2, characterized in that: the transformer substation side circuit breaker S1, little water and electricity side circuit breaker S2 originally belong to and are the power output end, both sides circuit breaker all has the protection, can start the tripping operation simultaneously.
4. The method for starting reclosing in cooperation with the network access line of the small hydropower station as claimed in claim 3, characterized in that: when transient short-circuit fault occurs, the substation side breaker S1 judges that the line at the outlet end is not voltage through PT1, reclosing is started, and the line is electrified; the PT2 is pressed, the small hydropower side circuit breaker S2 judges that the line at the outlet end is pressed through the PT2, reclosing is started, and the line is automatically powered normally.
5. The method for starting reclosing in cooperation with the network access line of the small hydropower station as claimed in claim 4, characterized in that: when a permanent short-circuit fault occurs, the substation side circuit breaker S1 judges that a line end circuit is not pressurized through PT1, reclosing is started, after the substation side circuit breaker S1 fails to start reclosing, the PT2 does not have pressure, and the small hydropower side circuit breaker S2 does not start reclosing.
6. The method for starting reclosing in cooperation with the network access line of the small hydropower station as claimed in claim 2 or 5, characterized in that: when a transient fault occurs at the user side, the breaker at the user side starts one reclosing, and the equipment recovers normal power supply.
7. The method for starting reclosing in cooperation with the network access line of the small hydropower station as claimed in claim 6, characterized in that: when a permanent fault occurs at the user side, the user side breaker will be tripped again after starting a reclosing switch once, and the safe operation of the distribution network cannot be influenced after tripping.
8. The method for starting reclosing in cooperation with the network access line of the small hydropower station as claimed in claim 7, characterized in that: the breaker installed at the T contact of the user side is a breaker with a current and voltage type protection function.
9. The method for starting reclosing in cooperation with the network access line of the small hydropower station as claimed in claim 5, characterized in that: the voltage original of the substation side circuit breaker S1 device disappears through PT voltage, and the reclosing logic of the protection device starts when the voltage of the reclosing device disappears; the voltage original part of the protection device at the side of the small hydropower station is charged with voltage through PT, and then reclosing logic can be started.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111362837.7A CN114050546A (en) | 2021-11-17 | 2021-11-17 | Reclosing method for cooperatively starting network access line of small hydropower station |
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| CN202111362837.7A CN114050546A (en) | 2021-11-17 | 2021-11-17 | Reclosing method for cooperatively starting network access line of small hydropower station |
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