CN111884177B - In-situ feeder automation method based on voltage and current protection - Google Patents
In-situ feeder automation method based on voltage and current protection Download PDFInfo
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- CN111884177B CN111884177B CN202010635132.7A CN202010635132A CN111884177B CN 111884177 B CN111884177 B CN 111884177B CN 202010635132 A CN202010635132 A CN 202010635132A CN 111884177 B CN111884177 B CN 111884177B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention discloses a local feeder automation method based on voltage and current protection. The invention installs the breaker at the head end of the branch line, configures the instantaneous overcurrent protection and reclosing function, and forms the time step difference with the outgoing line overcurrent II section protection of the transformer substation; the main line section switch and the interconnection switch are both provided with circuit breakers. The invention has short fault processing time, and can complete permanent fault isolation of the trunk line and recovery power supply of a non-fault area within ten seconds; when transient faults occur on the circuit, the sectional switch does not need to be tripped, and the processing mode is consistent with that of the case of no feeder automation function, so that the power failure time of a user is reduced; the outgoing line protection configuration and the reclosing logic of the transformer substation are not required to be modified, and the implementation is convenient; the normal operation of the main line is not influenced when the branch line fails, and the power failure times of the main line are effectively reduced.
Description
Technical Field
The invention belongs to the field of power systems and automation thereof, and relates to a local feeder automation method based on voltage and current protection.
Background
With the continuous promotion of distribution network automation construction, in-situ feeder automation is widely applied to overhead line fault treatment.
The local feeder automation of the distribution network mainly has the main forms of voltage time type, voltage and current time type, self-adaptive synthesis type and the like at present, but the feeder automation of the above forms generally has certain technical problems: the fault processing time is long and can reach dozens of seconds; multiple reclosing of a substation outgoing line switch is needed, the existing standardized substation protection is difficult to realize multiple reclosing, and the multiple reclosing has large impact on a line; the branch lines are brought into the in-situ feeder automation processing range, the overhead line has more branch lines and multiple faults, and the faults of the branch lines in the mode can cause the power failure of the main trunk line and influence the normal operation of the main trunk line and other branch lines; when a transient fault occurs in a line, the fault processing is finished by one-time reclosing of the line without using the in-situ feeder automation, and section switches on the line using the existing in-situ feeder automation also need to be tripped and then reclosed, so that the fault processing is complicated, and the fault processing time is prolonged.
The technical problems existing above affect the application effect of in-situ feeder automation in overhead line fault treatment.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects in the prior art and provide a local feeder automation method based on voltage and current protection, which provides a more optimized processing means for the fault processing of the overhead line of the distribution network, and does not influence the normal operation of the main line when the branch line has a fault so as to effectively reduce the power failure times of the main line.
In order to solve the technical problem, the invention adopts the following technical scheme: a local feeder automation method based on voltage and current protection is characterized in that a breaker is installed at the head end of a branch line, instantaneous overcurrent protection and reclosing functions are configured, and time step difference coordination is formed with the outgoing line overcurrent II-stage protection of a transformer substation; the main line section switch and the interconnection switch are both provided with circuit breakers.
The invention adopts the branch line to configure overcurrent protection, reclosing and the breaker, does not influence the normal operation of the main line when the branch line has a fault, and effectively reduces the power failure times of the main line.
Furthermore, the outgoing line switch of the transformer substation is configured with three-section type overcurrent protection and one-time reclosing functions, the overcurrent I-section protection range is shortened, the current constant value is set according to the sensitivity of short-circuit faults occurring at the line outlet, the first section switch avoids the overcurrent I-section protection range, and the overcurrent II-section protection delay is set to be more than 0.2 s;
the section switch is provided with a voltage-loss overcurrent protection function, a secondary voltage-loss protection function, a voltage switching-on function and a switching-on quick-break protection function;
the voltage-loss overcurrent protection: detecting three-phase voltage loss of the section switch in a charging state, recording the voltage loss state when the time is more than 200ms, and tripping the section switch when the voltage loss state detects any two-phase overcurrent of the section switch, and performing instantaneous action of voltage loss overcurrent protection;
the two-time voltage loss protection: detecting three-phase voltage loss of the section switch in a charging state, recording as primary voltage loss if the time is more than 200ms, and tripping the section switch by two-time voltage loss protection instantaneous actions after detecting two-time voltage loss;
the pressure switching-on function: under-voltage overcurrent protection action or two under-voltage protection actions start a voltage-switching-on function, and delay switching-on is carried out after one side of the section switch is detected to have voltage;
the rapid closing protection comprises the following steps: and (3) opening the instantaneous overcurrent protection function for 200ms in a short time at the closing moment of the section switch, and closing the section switch by the closing quick-break protection action.
Furthermore, the section switch is also provided with a charge-discharge function and a residual voltage locking function;
the charge and discharge functions are as follows: the section switch is in a closed position, the voltage is normally delayed for 10s, and the charging is finished, and the section switch is manually switched off, and discharges after the voltage-loss overcurrent protection action or the two voltage-loss protection actions;
the residual pressure locking function is as follows: and after the section switch is tripped by voltage loss protection for two times, the residual voltage locking function is started, and the voltage switching-on function is locked when the sudden change of any phase voltage is greater than 10% of the rated voltage.
Furthermore, the interconnection switch is provided with a charging and discharging function, a unilateral non-voltage switching-on function and a residual voltage locking function;
the charge and discharge functions are as follows: the interconnection switch is positioned at a separation position, the voltages at two sides are normally delayed for 10s, then charging is completed, and discharging is carried out after unilateral non-voltage switching-on or residual voltage locking action;
the unilateral non-pressure switching-on function is as follows: the single side of the interconnection switch is free of voltage and the interconnection switch is switched on after a period of time delay;
the residual voltage locking function is as follows: and after the voltage of one side of the interconnection switch is lost, the residual voltage locking function is started, and the voltage break variable of any phase is greater than 10% of the rated voltage, so that the non-voltage switching-on function of the one side is locked.
The invention has the following beneficial effects: the overcurrent I section protection range of the transformer substation is shortened, the overcurrent II section protection delay is set to be more than 0.2s, the section switch is provided with the pressure switch-on and switch-on quick-break protection, fault processing can be completed only by one trip and one reclosing of the transformer substation, the fault processing time is effectively shortened, and permanent fault isolation and non-fault area restoration power supply of a main line can be completed within ten seconds; when transient faults occur on a line, the step-down over-current protection and the two-time step-down protection enable the sectional switch to be free of tripping and the processing mode is consistent with that of the case without a feeder automation function, so that the power failure time of a user is reduced; the outgoing line protection and reclosing logic of the transformer substation are not required to be modified, and the implementation is convenient; the branch line is provided with overcurrent protection, reclosing and a breaker, so that the normal operation of the main line is not influenced when the branch line breaks down, and the power failure times of the main line are effectively reduced.
The invention is further described with reference to the drawings and the detailed description.
Drawings
Fig. 1 is a schematic diagram of a transient fault of a branch line in an embodiment of the present invention ((a) represents a transient fault, (b) represents a branch line protection operation trip F, and (c) represents a reclosing switch);
fig. 2 is a schematic diagram of a permanent fault of a branch line in an embodiment of the present invention ((a) indicates a permanent fault, (b) indicates a branch line protection operation trip F, and (c) indicates a superimposed fault);
FIG. 3 is a schematic diagram of a transient fault of a trunk line in an embodiment of the present invention (a) indicates a transient fault, (b) indicates that a protection operation of a power substation outlet is tripped S1, and none of the protection operations A, B, C is tripped, (c) indicates that the S1 is reclosed and a line is normally operated);
FIG. 4 is a schematic diagram of a permanent fault of a main line in an embodiment of the invention, (a) represents a permanent fault, (B) represents a tripping S1 of a protection action of a power substation outlet, (C) represents an S1 switch reclosing, (d) represents a tripping A, B of a no-voltage and over-current protection action, (e) represents a tripping C of two no-voltage protection actions, (f) represents a A, B switch which is sequentially pressed and closed, and a B switch closing quick-break protection action tripping switch); and (g) representing the closing of the unilateral non-voltage function action of the communication switch D.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
The transformer substation outlet switch is provided with three-section type overcurrent protection and one-time reclosing functions. The overcurrent I section protection range is shortened, the current constant value is set sensitively according to the occurrence of short circuit faults at the line outlet, the first section switch is enabled to avoid the overcurrent I section protection range (namely the overcurrent I section protection range does not protect the first section switch), and the overcurrent II section protection delay is set to be more than 0.2 s.
A breaker is installed at the head end of a branch line, instantaneous overcurrent protection and reclosing functions are configured, and time step difference coordination is formed between the breaker and the outgoing line overcurrent II-stage protection of a transformer substation. The main line section switch and the interconnection switch are both provided with circuit breakers.
The sectionalizer configures the following functions:
1) And in the charging and discharging function, the section switch is in the closed position, the voltage is normally delayed for 10s, the charging is completed, and the switch is manually switched off, and the discharging is performed after the voltage-losing overcurrent protection action or two voltage-losing protection actions.
2) Protection against loss of voltage and overcurrent, detecting three-phase loss of voltage (U) of sectionalizing switch in charging state A &U B &U C ≤U Is low in ) And if the time is more than 200ms, recording the voltage-loss state, and under the voltage-loss state, if any two-phase overcurrent of the section switch is detected, instantly performing voltage-loss overcurrent protection to trip the section switch.
3) Twice voltage loss protection, detection of three-phase voltage loss (U) of section switch in charging state A &U B &U C ≤U Is low with ) And if the time is more than 200ms, recording as one-time voltage loss, and after two-time voltage loss is detected, carrying out two-time voltage loss protection instantaneous actions to trip the sectional switch.
4) And a pressure switch-on function is started by a voltage-loss overcurrent protection action or two voltage-loss protection actions, and delayed switch-on is carried out after one side of the section switch is detected to have voltage.
5) And (4) switching-on quick-break protection, wherein an instantaneous overcurrent protection function is opened for 200ms in a short time at the instant of switching-on of the section switch, and the switching-on quick-break protection action is to trip off the section switch and lock the section switch to switch on.
6) The residual voltage locking function is started after the sectional switch is subjected to voltage loss tripping twice, and the sudden change of any phase voltage is greater than 10 percent (delta U) of the rated voltage A ≥10％U e Or U B ≤10％U e Or U C ≤10％U e ) The lock has the press switch-on function.
The tie switch is configured with the following functions:
1) And in the charging and discharging function, the contact switch is in a separated position, the voltages on two sides are normally delayed for 10s, then charging is completed, and discharging is carried out after unilateral non-voltage switching-on or residual voltage locking action.
2) The non-pressure switching-on function of the single side, the contact switch is switched on after the non-pressure of the single side of the contact switch and a period of time delay;
3) Residual voltage locking function is started after the voltage of one side of the interconnection switch is lost, and the sudden change of any phase voltage is greater than 10 percent (delta U) of rated voltage A ≥10％U e Or U B ≤10％U e Or U C ≤10％U e ) The locking unilateral non-pressure switch-on function is realized.
To further illustrate the above process, the following examples are given.
In fig. 1-4, S1 and S2 are substation outgoing line switches, A, B, C, E is a section switch, D is a tie switch, and F is a branch line switch.
1) Transient fault of branch line
When a transient fault occurs in a branch line, as shown in fig. 1, the branch line current protection and the substation outgoing line switch protection have a level difference fit, the branch line current protection action trips to remove the fault, and then the reclosing action is performed, so that the branch line recovers to normal operation.
2) Permanent fault of branch line
When a permanent fault occurs in the branch line, as shown in fig. 2, the branch line current protection and the substation outgoing line switch protection have a level difference fit, the branch line current protection action trips to remove the fault, and then recloses, the branch line switch trips again after reclosing, and the trunk line continues to operate.
3) Transient main line fault
When the circuit works normally, the section switch and the interconnection switch are charged. When transient faults occur between the main line section switches B and C, as shown in fig. 3, the outgoing line protection action of the transformer substation trips the outgoing line switch S1, the section switches A, B, C are all in voltage loss once, the A, B, C switch is in voltage loss over-current protection and cannot act in voltage loss protection twice, and the switches are kept in a closed position. And after the reclosing delay, the transformer substation switch S1 is successfully reclosed, and the line returns to normal operation.
4) Permanent failure of main line
When the circuit works normally, the section switch and the interconnection switch are charged. When a permanent fault occurs between the main line section switches B and C, as shown in fig. 4, the substation outgoing line protection action trips the outgoing line switch S1, the section switches A, B, C are all subjected to voltage loss once, the substation switch S1 is superposed on the fault after reclosing delay, the section switch A, B flows through fault current, and the voltage loss overcurrent protection instantaneous action trips A, B. The voltage-losing and overcurrent protection actions of the section switch A, B start the switch to have a switch-on function, one side of the section switch A has voltage and is switched on after delay, one side of the section switch B has voltage after the switch-on of the section switch A and is also switched on, and the section switch B opens the switch-on quick-break protection in a short time at the moment of switch-on. And as the section switch B is switched on due to a fault, the switching-on quick-break protection action trips the section switch B and locks the switching-on. After the sectional switch A, B is subjected to voltage loss and overcurrent protection actions and is tripped off, the sectional switch C is subjected to voltage loss for the second time, and the voltage loss protection actions are tripped off for two times. When the section switch B is superposed on the fault, the section switch C detects the residual voltage, and the residual voltage locking function is started to lock the section switch C to be switched on. After the subsection switch A, B is tripped after the voltage loss and overcurrent protection action, the interconnection switch D starts the single-side voltage loss and voltage-free switching-on function, and the switch D is switched on after a certain time delay to recover the power supply of a non-fault area.
Claims (3)
1. An in-situ feeder automation method based on voltage and current protection is characterized in that a breaker is installed at the head end of a branch line, instantaneous overcurrent protection and reclosing functions are configured, and time step difference coordination is formed with the outgoing line overcurrent II-stage protection of a transformer substation; the main line section switch and the interconnection switch are both provided with circuit breakers;
the outgoing line switch of the transformer substation is provided with three-section type overcurrent protection and one-time reclosing function, the overcurrent I-section protection range is shortened, the current fixed value is set according to the sensitivity of short-circuit fault at a line outlet, the first section switch avoids the overcurrent I-section protection range, and the overcurrent II-section protection delay is set to be more than 0.2 s;
the section switch is provided with a voltage-loss overcurrent protection function, a secondary voltage-loss protection function, a voltage switching-on function and a switching-on quick-break protection function;
the voltage-loss overcurrent protection: detecting three-phase voltage loss of the section switch in a charging state, recording the voltage loss state when the time is more than 200ms, and tripping the section switch when the voltage loss state detects any two-phase overcurrent of the section switch, and performing instantaneous action of voltage loss overcurrent protection;
the two-time voltage loss protection: detecting three-phase voltage loss of the section switch in a charging state, recording as primary voltage loss if the time is more than 200ms, and tripping the section switch by two-time voltage loss protection instantaneous actions after detecting two-time voltage loss;
the pressure switching-on function: under-voltage overcurrent protection action or two under-voltage protection actions start a voltage-switching-on function, and delay switching-on is carried out after one side of the section switch is detected to have voltage;
the rapid closing protection comprises the following steps: and (3) opening the instantaneous overcurrent protection function for 200ms in a short time at the closing moment of the section switch, and closing the section switch by the closing quick-break protection action.
2. The in-place feeder automation method based on voltage and current protection as claimed in claim 1, wherein the section switch is further configured with a charge-discharge function and a residual voltage blocking function;
the charge and discharge functions are as follows: the section switch is in a closed position, the voltage is normally delayed for 10s, and the charging is finished, and the section switch is manually switched off, and discharges after the voltage-loss overcurrent protection action or the two voltage-loss protection actions;
the residual voltage locking function is as follows: and after the section switch performs voltage loss protection actions twice, the residual voltage locking function is started, and any phase voltage abrupt change quantity is larger than 10% of the rated voltage, so that the voltage switching-on function is locked.
3. The in-situ feeder automation method based on voltage and current protection as claimed in claim 1, wherein the tie switch is configured with a charge-discharge function, a unilateral no-voltage switching-on function and a residual voltage locking function;
the charge and discharge functions are as follows: the contact switch is positioned at a separation position, the voltages on two sides are normally delayed for 10s, then charging is completed, and discharging is carried out after unilateral non-voltage switching-on or residual voltage locking action;
the unilateral non-pressure switching-on function is as follows: the single side of the interconnection switch is free of voltage and the interconnection switch is switched on after a period of time delay;
the residual voltage locking function is as follows: and after the voltage of the single side of the interconnection switch is lost, the residual voltage locking function is started, and the non-voltage switching-on function of the single side is locked when the sudden change of any phase voltage is greater than 10% of the rated voltage.
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| CN112234588B (en) * | 2020-11-10 | 2023-03-31 | 国网河南省电力公司经济技术研究院 | Circuit breaker-based power distribution network line protection system and method |
| CN113032978A (en) * | 2021-03-08 | 2021-06-25 | 贵州电网有限责任公司 | Self-adaptive comprehensive FA function logic control simulation method |
| CN114243655A (en) * | 2021-12-16 | 2022-03-25 | 广东电网有限责任公司 | Locking control method and related device |
| CN116316487B (en) * | 2023-05-12 | 2023-10-27 | 珠海许继电气有限公司 | Fault self-healing method and system for distribution line |
| CN117010206A (en) * | 2023-08-14 | 2023-11-07 | 广东工业大学 | Simulation method and terminal for power distribution network local feeder automation |
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| US9413156B2 (en) * | 2012-07-27 | 2016-08-09 | San Diego Gas & Electric Company | System for detecting a falling electric power conductor and related methods |
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