CN112769107A - Virtual circuit breaker-based distribution line three-section type current protection configuration method - Google Patents
Virtual circuit breaker-based distribution line three-section type current protection configuration method Download PDFInfo
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- CN112769107A CN112769107A CN202011564395.XA CN202011564395A CN112769107A CN 112769107 A CN112769107 A CN 112769107A CN 202011564395 A CN202011564395 A CN 202011564395A CN 112769107 A CN112769107 A CN 112769107A
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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
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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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
- H02H3/006—Calibration or setting of parameters
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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
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
- H02H3/042—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned combined with means for locating the fault
-
- 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
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
- H02H3/044—Checking correct functioning of protective arrangements, e.g. by simulating a fault
Abstract
The invention discloses a virtual circuit breaker-based distribution line three-section type current protection configuration method, which comprises the following steps of: a: judging whether a circuit breaker with protection mismatch exists or not; b: judging whether a branch without a breaker exists in the protection range of the breaker with protection mismatch; c: setting a virtual circuit breaker; d: setting the protection mismatched circuit breaker to be in an unmatched protection state; e: setting the protection fixed value of each circuit breaker on the line to be detected again; f: continuously judging whether a circuit breaker with protection mismatch exists or not; if yes, setting the circuit breaker with the protection mismatch as a non-protection state, and then returning to the step E; if not, entering step G; g: judging whether a fault indicator is installed at the head end of the branch; h: the fault indicator installed at the head end of the branch circuit is linked with the circuit breaker with the protection mismatch of the previous stage. The invention can avoid the mismatch phenomenon caused by that the local branch circuit is not provided with the breaker.
Description
Technical Field
The invention relates to the technical field of power system automation, in particular to a virtual circuit breaker-based distribution line three-section type current protection configuration method.
Background
At present, when three-section current protection is configured on a power distribution line of an electric power system, most of the three-section current protection is only subjected to fixed value setting according to field actual conditions, and the fixed value can meet the premise of relay protection selectivity, sensitivity and quick action, so that the position of each breaker on the line is reasonably set. In practical situations, due to the limitations of the long-term performance, the unbalance performance and the investment amount of power grid construction, line construction and transformation in many areas are gradually performed year by year, the situation that the position of a breaker is unreasonable in a certain stage is likely to occur, a branch line short breaker is common, or only a fault indicator is installed, as shown in fig. 1, if setting calculation is still performed according to the actual situation on site at the moment, namely, the breaker and the protection installation position are matched step by step, the situation that the setting values of the current I section (quick-break protection) and the current II section (time-limited current quick-break protection) of the upper-level breaker of the branch line cannot meet the requirements of selectivity and sensitivity at the same time may occur, so that setting of each protection of the lower level is affected. In this respect, the conventional method is to sacrifice the selectivity of protection, and only configure a fixed value from the perspective of sensitivity, and although all faults can be guaranteed to be removed, a step-by-step trip condition may occur, which causes the expansion of the power failure range, and further affects the power supply reliability.
Therefore, aiming at the defects of the conventional mode, a three-stage type current protection configuration method of the distribution line based on the virtual circuit breaker is researched and proposed.
Disclosure of Invention
The invention aims to provide a virtual circuit breaker-based distribution line three-section type current protection configuration method, which can avoid the mismatch phenomenon caused by no circuit breaker installed in a local branch, furthest ensure the compatibility of the relay protection selectivity and sensitivity of a whole line, and ensure that a line can still reasonably configure a three-section type current protection fixed value when the line is in a certain imperfect stage of construction and transformation. Meanwhile, the fault point can be more accurately positioned, so that the repair efficiency is improved for the working personnel, and the power restoration time is shortened.
The invention adopts the following technical scheme:
a virtual circuit breaker-based distribution line three-section type current protection configuration method comprises the following steps:
a: according to a three-section type current protection setting principle of a distribution line, setting a protection constant value of each circuit breaker on a to-be-detected line, judging whether a circuit breaker with protection mismatch exists or not, and if the circuit breaker with protection mismatch exists, determining the circuit breaker with protection mismatch; then entering the step B; if the circuit breaker protection setting value does not exist, the circuit breaker protection setting value on the to-be-detected line is shown to be reasonably set without re-setting;
b: judging whether a branch circuit without the breaker is arranged in the protection range of the breaker with the determined protection mismatch, and entering the step C if the branch circuit without the breaker is arranged in the protection range of the breaker with the determined protection mismatch; if not, entering step D;
c: setting a virtual circuit breaker at the determined branch inlet wire without the circuit breaker, and then entering the step E;
d: setting the protection mismatched circuit breaker to be in an unmatched protection state; then entering step E;
e: according to the three-section type current protection setting principle of the distribution line, setting the protection constant value of each circuit breaker on the to-be-detected line again, and then entering the step F;
f: continuously judging whether a circuit breaker with protection mismatch exists or not;
if the circuit breaker with the protection mismatch still exists on the line to be detected, setting the circuit breaker with the protection mismatch as an un-matched protection state, then returning to the step E according to a three-section type current protection setting principle of the distribution line, and setting the protection fixed value of each circuit breaker on the line to be detected again;
if the circuit breaker with protection mismatch does not exist on the line to be detected, entering the step G;
g: judging whether a fault indicator is installed at the head end of the branch circuit provided with the virtual circuit breaker, and entering a step H if the fault indicator is installed; if not, then step H is carried out after a fault indicator is installed at the head end of the branch;
h: and on the branch provided with the virtual circuit breaker, a fault indicator installed at the head end of the branch is linked with a circuit breaker with the protection mismatch of the previous stage, the signal sent by the fault indicator is utilized to identify the fault of the branch provided with the virtual circuit breaker, and tripping is executed through the circuit breaker.
In the step A:
when any one of the following conditions is met, the circuit breaker is regarded as a circuit breaker for protecting mismatch:
condition 1: the current I section (quick-break protection) has no protection range, i.e.
In the formula (I), the compound is shown in the specification,
the sensitivity of the current I section is shown;
the starting constant value of the current I section is represented; i isk.maxThe fault current value of the breaker when the protection outlet is in a three-phase short circuit in a large mode is shown;
condition 2: the current II section (time-limited current quick-break protection) can not be taken, i.e.
In the formula (I), the compound is shown in the specification,
the sensitivity of the current II section is shown; i isk.minThe fault current value is used for representing the fault current value when the tail end of a line protected by the circuit breaker is subjected to two-phase interphase short circuit in a small mode;
representing the reliability coefficient of the current II section;
and the starting constant value of the current I section of the lower-stage circuit breaker is shown.
In the step E, when the protection constant value of each circuit breaker on the line to be detected is set again, the setting is performed according to the following setting principle:
(1) when the virtual circuit breaker is set, a current II section and a current III section are configured, and a constant value is set according to a conventional principle;
(2) configuring a current I section, a current II section and a current III section when a circuit breaker with mismatching protection at the upper stage of the virtual circuit breaker is adjusted; setting the current I section and the current III section according to a conventional principle; when the current II section is set, the t is increased besides the conventional principleIIThe constraint of (2): t is tII≥tgz+Δt；
In the formula, tIIIndicating a delay in action, tgzRepresenting the time taken from the occurrence of a fault to the issuance of a trip signal by the fault indicator, at representing the communication delay;
(3) and when the rest circuit breakers on the line to be detected are set, setting according to the conventional principle of configuring the current I section, the current II section and the current III section.
In the step H:
when the fault indicator identifies the fault of the branch provided with the virtual circuit breaker, the fault indicator collects electrical quantity information, and when the numerical value of the electrical quantity information reaches the protection fixed value of the virtual circuit breaker, the fault in the area is judged to occur;
when the circuit breaker with the protection mismatch of the previous stage is used for tripping, the fault indicator sends fault information to a power distribution switch monitoring terminal or a power distribution automatic terminal of the circuit breaker with the protection mismatch of the previous stage, and the power distribution switch monitoring terminal or the power distribution automatic terminal sends a tripping instruction to control the circuit breaker with the protection mismatch of the previous stage to trip.
In the process of setting calculation of the distribution line, mismatching caused by the fact that a breaker is not installed in a local branch can be avoided, compatibility of relay protection selectivity and sensitivity of the whole line is guaranteed to the maximum extent, and the three-section type current protection fixed value can still be reasonably configured when the line is in a certain imperfect stage of construction and transformation; the fault indicator which is much cheaper than the circuit breaker is fully utilized, the investment of line equipment is saved while the sensitivity of branch protection action is ensured, fault points can be positioned more accurately, the convenience is brought to workers to improve the first-aid repair efficiency, and the time for recovering power supply is shortened.
Drawings
FIG. 1 is a single line schematic diagram of a prior art distribution line with only fault indicators installed but no circuit breakers installed;
FIG. 2 is a schematic view of the installation position of the virtual circuit breaker according to the present invention;
FIG. 3 is a schematic flow chart of the present invention.
Detailed Description
The invention is described in detail below with reference to the following figures and examples:
as shown in fig. 2 to fig. 3, the three-stage current protection configuration method for a distribution line based on a virtual circuit breaker according to the present invention includes the following steps:
a: according to a three-section type current protection setting principle of a distribution line, setting a protection constant value of each circuit breaker on a to-be-detected line, judging whether a circuit breaker with protection mismatch exists or not, and if the circuit breaker with protection mismatch exists, determining the circuit breaker with protection mismatch; then entering the step B; if the circuit breaker protection setting value does not exist, the circuit breaker protection setting value on the to-be-detected line is shown to be reasonably set without re-setting;
when any one of the following conditions is met, the circuit breaker is regarded as a circuit breaker for protecting mismatch:
condition 1: the current I section (quick-break protection) has no protection range, i.e.
In the formula:
the sensitivity of the current I section is shown;
the starting constant value of the current I section is represented; i isk.maxThe fault current value of the breaker when the protection outlet is in a three-phase short circuit in a large mode is shown.
Condition 2: the current II section (time-limited current quick-break protection) can not be taken, i.e.
In the formula:
the sensitivity of the current II section is shown; i isk.minThe fault current value is used for representing the fault current value when the tail end of a line protected by the circuit breaker is subjected to two-phase interphase short circuit in a small mode;
representing the reliability coefficient of the current II section;
the starting constant value of the current I section of the lower-level breaker is represented;
the reasons for protection mismatch are mainly:
reason 1: the current I section (quick break protection) has no protection range, for example, in FIG. 2, the 2# breaker is too close to the 4# breaker, and the short-circuit current values at the head and the tail ends of the circuit section are very close, which results in that
The timing value will be very close to or even greater than I according to conventional principlesk.maxI.e. the "sensitivity" of the protection is not satisfactory;
reason 2: the current II section (time-limited current quick-break protection) can not take value, for example, in fig. 2, the 2# breaker is regular according to the conventional principle, the protection range needs to cover the high-voltage side of the 2# transformer, and because the branch two lines are very long, the protection range of the 3# breaker current I section can be exceeded when the branch two lines correspond to the main line according to the same length, namely, the 'selectivity' of protection can not be met.
B: judging whether a branch circuit without the breaker is arranged in the protection range of the breaker with the determined protection mismatch, and entering the step C if the branch circuit without the breaker is arranged in the protection range of the breaker with the determined protection mismatch; if not, entering step D;
c: setting a virtual circuit breaker at the determined branch inlet wire without the circuit breaker, and then entering the step E;
d: setting the protection mismatched circuit breaker to be in an unmatched protection state; then entering step E;
e: according to the three-section type current protection setting principle of the distribution line, setting the protection constant value of each circuit breaker on the to-be-detected line again, and then entering the step F;
f: continuously judging whether a circuit breaker with protection mismatch exists or not;
if the circuit breaker with the protection mismatch still exists on the line to be detected, setting the circuit breaker with the protection mismatch as an un-matched protection state, then returning to the step E according to a three-section type current protection setting principle of the distribution line, and setting the protection fixed value of each circuit breaker on the line to be detected again;
if the circuit breaker with protection mismatch does not exist on the line to be detected, entering the step G;
g: judging whether a fault indicator is installed at the head end of the branch circuit provided with the virtual circuit breaker, and entering a step H if the fault indicator is installed; if not, then step H is carried out after a fault indicator is installed at the head end of the branch;
h: and on the branch provided with the virtual circuit breaker, a fault indicator installed at the head end of the branch is linked with a circuit breaker with the protection mismatch of the previous stage, the signal sent by the fault indicator is utilized to identify the fault of the branch provided with the virtual circuit breaker, and tripping is executed through the circuit breaker.
In step E of the present invention:
when the setting of the protection fixed value of each circuit breaker on the line to be detected is carried out again, the setting is carried out according to the following setting principle:
1. when the virtual circuit breaker is set, a current II section (time-limited current quick-break protection) and a current III section (overcurrent protection) are configured, and a fixed value is set according to a conventional principle;
2. when a circuit breaker with the mismatch protection of the upper stage of the virtual circuit breaker is set, a current I section (quick break protection), a current II section (time-limited current quick break protection) and a current III section (overcurrent protection) are configured, wherein the current I section and the current III section are set according to a conventional principle; when the current II section is set, the current II section is also added with the relation t in addition to the setting according to the conventional principleIIConstraint of (action delay): t is tII≥tgz+Δt；
In the formula: t is tgzIndicating the time taken from the occurrence of the fault to the issuance of the trip signal by the fault indicator, and at represents the communication delay.
Increase with respect to tIIThe constraint conditions (action delay) can beEffectively satisfy this circuit breaker protection configuration's "selectivity" for the definite value setting is more reasonable, thereby has improved the exactness of circuit breaker action.
3. And setting the rest circuit breakers on the line to be detected according to the conventional principle of configuring a current I section (quick break protection), a current II section (time-limited current quick break protection) and a current III section (overcurrent protection).
In step F of the invention: if the protection mismatch condition still exists on the line to be detected, the mismatch reason is considered to correspond to 'reason 1', and the mismatch breaker needing to quit protection refers to a subordinate breaker (such as a 4# breaker in fig. 2) which causes the sensitivity verification failure of a superior breaker (such as a 2# breaker in fig. 2).
In step H of the present invention:
when the fault indicator identifies the fault of the branch provided with the virtual circuit breaker, the fault indicator collects electrical quantity information, and when the numerical value of the electrical quantity information reaches the protection fixed value of the virtual circuit breaker, the fault in the area is judged to occur;
when the circuit breaker with the protection mismatch of the previous stage is used for tripping, the fault indicator sends fault information to a power distribution switch monitoring terminal or a power distribution automatic terminal of the circuit breaker with the protection mismatch of the previous stage, and the power distribution switch monitoring terminal or the power distribution automatic terminal sends a tripping instruction to control the circuit breaker with the protection mismatch of the previous stage to trip.
Claims (4)
1. A virtual circuit breaker-based distribution line three-section type current protection configuration method is characterized by comprising the following steps:
a: according to a three-section type current protection setting principle of a distribution line, setting a protection constant value of each circuit breaker on a to-be-detected line, judging whether a circuit breaker with protection mismatch exists or not, and if the circuit breaker with protection mismatch exists, determining the circuit breaker with protection mismatch; then entering the step B; if the circuit breaker protection setting value does not exist, the circuit breaker protection setting value on the to-be-detected line is shown to be reasonably set without re-setting;
b: judging whether a branch circuit without the breaker is arranged in the protection range of the breaker with the determined protection mismatch, and entering the step C if the branch circuit without the breaker is arranged in the protection range of the breaker with the determined protection mismatch; if not, entering step D;
c: setting a virtual circuit breaker at the determined branch inlet wire without the circuit breaker, and then entering the step E;
d: setting the protection mismatched circuit breaker to be in an unmatched protection state; then entering step E;
e: according to the three-section type current protection setting principle of the distribution line, setting the protection constant value of each circuit breaker on the to-be-detected line again, and then entering the step F;
f: continuously judging whether a circuit breaker with protection mismatch exists or not;
if the circuit breaker with the protection mismatch still exists on the line to be detected, setting the circuit breaker with the protection mismatch as an un-matched protection state, then returning to the step E according to a three-section type current protection setting principle of the distribution line, and setting the protection fixed value of each circuit breaker on the line to be detected again;
if the circuit breaker with protection mismatch does not exist on the line to be detected, entering the step G;
g: judging whether a fault indicator is installed at the head end of the branch circuit provided with the virtual circuit breaker, and entering a step H if the fault indicator is installed; if not, then step H is carried out after a fault indicator is installed at the head end of the branch;
h: and on the branch provided with the virtual circuit breaker, a fault indicator installed at the head end of the branch is linked with a circuit breaker with the protection mismatch of the previous stage, the signal sent by the fault indicator is utilized to identify the fault of the branch provided with the virtual circuit breaker, and tripping is executed through the circuit breaker.
2. The virtual breaker-based distribution line three-stage current protection configuration method of claim 1, wherein in the step a:
when any one of the following conditions is met, the circuit breaker is regarded as a circuit breaker for protecting mismatch:
condition 1: current I section (quick break protection) no protection rangeEnclose, i.e.
In the formula (I), the compound is shown in the specification,
the sensitivity of the current I section is shown;
the starting constant value of the current I section is represented; i isk.maxThe fault current value of the breaker when the protection outlet is in a three-phase short circuit in a large mode is shown;
condition 2: the current II section (time-limited current quick-break protection) can not be taken, i.e.
In the formula (I), the compound is shown in the specification,
the sensitivity of the current II section is shown; i isk.minThe fault current value is used for representing the fault current value when the tail end of a line protected by the circuit breaker is subjected to two-phase interphase short circuit in a small mode;
representing the reliability coefficient of the current II section;
and the starting constant value of the current I section of the lower-stage circuit breaker is shown.
3. The virtual circuit breaker-based distribution line three-stage current protection configuration method of claim 1, wherein in step E, when the setting of the protection constant value of each circuit breaker on the line to be detected is performed again, the setting is performed according to the following setting principle:
(1) when the virtual circuit breaker is set, a current II section and a current III section are configured, and a constant value is set according to a conventional principle;
(2) configuring a current I section, a current II section and a current III section when a circuit breaker with mismatching protection at the upper stage of the virtual circuit breaker is adjusted; setting the current I section and the current III section according to a conventional principle; when the current II section is set, the t is increased besides the conventional principleIIThe constraint of (2): t is tII≥tgz+Δt；
In the formula, tIIIndicating a delay in action, tgzRepresenting the time taken from the occurrence of a fault to the issuance of a trip signal by the fault indicator, at representing the communication delay;
(3) and when the rest circuit breakers on the line to be detected are set, setting according to the conventional principle of configuring the current I section, the current II section and the current III section.
4. The method of claim 1, wherein in step H:
when the fault indicator identifies the fault of the branch provided with the virtual circuit breaker, the fault indicator collects electrical quantity information, and when the numerical value of the electrical quantity information reaches the protection fixed value of the virtual circuit breaker, the fault in the area is judged to occur;
when the circuit breaker with the protection mismatch of the previous stage is used for tripping, the fault indicator sends fault information to a power distribution switch monitoring terminal or a power distribution automatic terminal of the circuit breaker with the protection mismatch of the previous stage, and the power distribution switch monitoring terminal or the power distribution automatic terminal sends a tripping instruction to control the circuit breaker with the protection mismatch of the previous stage to trip.
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| US20020012210A1 (en) * | 1999-12-29 | 2002-01-31 | Morris Robert A. | Circuit breaker incorporating fault lockout protection |
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| CN111781461A (en) * | 2020-06-01 | 2020-10-16 | 云南电网有限责任公司临沧供电局 | Ground fault line selection and section determination method for small-current grounding power system |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20020012210A1 (en) * | 1999-12-29 | 2002-01-31 | Morris Robert A. | Circuit breaker incorporating fault lockout protection |
| JP2006262597A (en) * | 2005-03-16 | 2006-09-28 | Univ Nagoya | Protection system of distribution system |
| US20110125339A1 (en) * | 2008-08-05 | 2011-05-26 | Rolls-Royce Plc | Protection arrangement for an electrical power distribution network |
| CN101800441A (en) * | 2010-03-26 | 2010-08-11 | 河南省电力公司许昌供电公司 | Method for processing boundary information deficiency of centralization protector of digitalized converting station |
| CN109217264A (en) * | 2018-08-22 | 2019-01-15 | 华北电力大学 | A kind of distribution protection system and method considering electric car random load |
| CN110416981A (en) * | 2019-07-31 | 2019-11-05 | 华北电力大学 | A kind of access power distribution network zone current guard method of electric car and system |
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