CN109031044B - Small-current single-phase grounding automatic line selection method for dispatching-end transformer substation - Google Patents
Small-current single-phase grounding automatic line selection method for dispatching-end transformer substation Download PDFInfo
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- 238000010187 selection method Methods 0.000 title claims abstract description 12
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- 238000005259 measurement Methods 0.000 description 4
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
Abstract
The invention discloses a low-current single-phase grounding automatic line selection method of a dispatching-end transformer substation, which comprises the following steps: judging whether one of the following three conditions is satisfied: zero sequence voltage 3U0>15V; alternatively, the phase voltage (U 1 ，U 2 )>7kV and U3<5kV; alternatively, the bus bar is grounded and the calculation cycle=2 is continued; if one of the voltages is met, storing the bus voltage, recording the running state of the line, and recording the line load and zero sequence current in the fault state; the running line comparison satisfies: IN0 failure-IN 0 initial +.0, MAX (I NO Failure) and MAX (I N0 failure-I N0 Initial) or MAX (2 gamma I N0 failure-I N0 Initial), outputting the line ID, sending out an alarm instruction, and ending. The invention has the advantages that: when a single-phase grounding occurs in the system, a grounding fault line is rapidly and accurately determined, so that the accident handling efficiency is improved, and the power supply stability of a power grid is improved; the power supply reliability of the power consumer is ensured, and the comprehensive economic loss caused by power failure or unqualified power quality is reduced.
Description
Technical Field
The invention relates to a low-current single-phase grounding automatic line selection method for a dispatching-end transformer substation.
Background
With the continuous development of the power grid, the safe operation of the power grid becomes a focus of attention, any fault of the power system inevitably causes an unpredictable loss, and how to accurately process the acquired information and timely remove the fault becomes a key place for the stable operation of the power system. In addition, people put higher requirements on safe operation and power supply reliability of the power grid, when a power system fails, workers are required to accurately position the power grid, and the stable operation of the power grid is restored at the fastest speed.
In China, most of the 6-35 kV medium-voltage distribution network systems adopt a mode that neutral points are not directly grounded, and the neutral points are called as small-current grounding systems. The grounding mode is beneficial to improving the power supply reliability. The probability of single-phase earth faults in the distribution network accounts for about 80% of the total faults. In a low-current grounding system, single-phase grounding has little threat to the power grid, and can continue to operate for 1-2 hours. Along with the development of power grid construction, the power transmission line of the power distribution network is longer, and the cable application is more and more, so that the capacitance to ground of the line is increased. If only a neutral point ungrounded mode is adopted, the short circuit current of the fault point is increased, arc extinction is not facilitated, and a greater threat is formed on equipment insulation. Therefore, the neutral point connection mode of the power distribution network system in China comprises the following steps: the neutral point is not grounded, the neutral point is grounded through a small resistor, and the neutral point is grounded through an arc suppression coil. The connection of the arc suppression coil and the resistor reduces the current during unidirectional grounding faults, also reduces the sensitivity and the selectivity of the fault line device by utilizing the information quantity, and influences the reliability of power supply. The existing single-phase earth fault line selection method of the low-current grounding system is influenced by CT unbalance, the number of outgoing lines, the line length, the system operation mode and the transition impedance no matter based on transient state quantity or steady state quantity, so that the requirements of a new line selection method are more urgent, and the accuracy of the line selection accuracy is improved.
In the current stage, when single-phase grounding faults occur in the small-current grounding system, the main processing method of the regulating end is to try to pull all outgoing lines on the corresponding voltage abnormal bus. According to the grounding line selection table, a fault line is determined according to the principles of pulling, feeding and carrying out one by one. In this process, there is a potential for discontinuities in the power supplied to the power consumer and multiple repeated operations of the power device switch. And is greatly influenced by the proficiency of personnel operation, the smoothness level of the operation of the open3000 system, the smoothness level of the information channel and other factors.
The original small-current single-phase grounding line selection device for configuring the transformer substation site is very inconvenient in parameter fine adjustment because the zero-sequence current at the single-phase grounding fault moment is visible along with unattended operation and dispatching centralized monitoring of the transformer substation, and the grounding line selection accuracy is lower and lower.
Along with the development of society and economy, people have higher requirements on uninterrupted power supply, how to quickly and accurately determine a fault line when a single-phase grounding occurs in a system, and the fault line is accelerated to remove the fault, so that the operation reliability is improved, the comprehensive economic loss caused by power failure is reduced, and the continuous power supply of power users is ensured.
Disclosure of Invention
The invention aims to provide a low-current single-phase grounding automatic line selection method for a dispatching-end transformer substation, which can effectively solve the problem that a fault line cannot be determined rapidly and accurately when the existing dispatching-end transformer substation is in single-phase grounding.
In order to solve the technical problems, the invention is realized by the following technical scheme: a low-current single-phase grounding automatic line selection method of a dispatching terminal transformer substation comprises the following steps:
A. judging whether one of the following three conditions is satisfied: zero sequence voltage 3U 0 >15V; alternatively, the phase voltage (U 1 ，U 2 )>7kV and U3<5kV; alternatively, the bus bar is grounded and the calculation cycle=2 is continued;
b1, if the result of step A is that one of three conditions is satisfied, storing the bus voltage (U a 、U b 、U c 、3U 0 ) Recording the running state of the line and the line load I under the fault state LN Zero sequence current I of line at fault moment N0 failure Step C1 is entered;
and C1, comparing and satisfying the operation line: i N0 failure -I N0 initial ≠0，MAX(I NO fault ) And MAX (I) N0 failure -I N0 initial ) Otherwise MAX (2×I) N0 failure -I N0 initial ) Outputting line ID, sending out alarm instruction, ending, wherein I N0 failure Is the zero sequence current of the line at the moment of failure, I N0 initial The initial zero sequence current of the line before failure;
b2, if the result of the step A does not meet one of three conditions, judging whether the ground fault duration is more than or equal to 3, and if so, performing a second operation; if not, entering a step C2;
c2, judging whether the earth fault duration period is changed to 0, and the operating circuit breaker 1 is changed to 0; if yes, the output line ID is consistent with the circuit breaker change operation line, a fault line is marked, and the zero sequence current I of the non-fault operation line is marked N0 initial Change to I N0 failure The value, then end; if not, storing the memory under the condition that one of the three conditions in the step A is not satisfied and not filledWrite through I N0 failure Give I N0 initial Zero sequence current I of the running line of (2) N0 initial And (5) ending.
Preferably, in the step B2, if the ground fault duration is 3 or more, the performing the second operation step is:
b2-1, judging whether the running line breaker 1 is changed to 0, if not, ending; if yes, entering the next step;
b2-2, storage bus voltage (U) a 、U b 、U c 、3U 0 ) Line running state, line load I under fault state LN2 Zero sequence current I N0 A fault 2;
b2-3, judging whether an arc suppression coil exists or not, and if so, comparing the running lines to meet the following conditions: i N0 failure 2 -I N0 initial ≠0，MAX(I N0 failure 2 -I N0 failure ) Outputting a line ID, sending out an alarm instruction and ending; if not, the run line comparison satisfies: i N0 failure 2 -I N0 initial ≠0，MAX(I NO fault 2 ) And MAX (I) N0 failure 2 -I N0 failure ) Otherwise, outputting the line ID, sending out an alarm instruction and ending.
Compared with the prior art, the invention has the advantages that:
1) When a single-phase grounding occurs in the system, a grounding fault line is rapidly and accurately determined, so that the accident handling efficiency is improved, and the power supply stability of a power grid is improved;
2) The power supply reliability of the power consumer is ensured, and the comprehensive economic loss caused by power failure or unqualified power quality is reduced.
Drawings
FIG. 1 is a flow chart of a low-current single-phase grounding automatic line selection method of a dispatching-end transformer substation;
FIG. 2 is a flow chart of a second operation in the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
Referring to fig. 1, an embodiment of a low-current single-phase grounding automatic line selection method for a dispatching-end transformer substation according to the present invention, the low-current single-phase grounding automatic line selection method for the dispatching-end transformer substation includes the following steps:
A. judging whether one of the following three conditions is satisfied: zero sequence voltage 3U 0 >15V; alternatively, the phase voltage (U 1 ，U 2 )>7kV and U3<5kV; alternatively, the bus bar is grounded and the calculation cycle=2 is continued;
b1, if the result of step A is that one of three conditions is satisfied, storing the bus voltage (U a 、U b 、U c 、3U 0 ) Recording the running state of the line and the line load I under the fault state LN Zero sequence current I of line at fault moment N0 failure Step C1 is entered;
and C1, comparing and satisfying the operation line: i N0 failure -I N0 initial ≠0，MAX(I NO fault ) And MAX (I) N0 failure -I N0 initial ) Otherwise MAX (2×I) N0 failure -I N0 initial ) Outputting line ID, sending out alarm instruction, ending, wherein I N0 initial The initial zero sequence current of the line before failure;
b2, if the result of the step A does not meet one of three conditions, judging whether the ground fault duration is more than or equal to 3, and if so, performing a second operation; if not, entering a step C2;
c2, judging whether the earth fault duration period is changed to 0, and the operating circuit breaker 1 is changed to 0; if yes, the output line ID is consistent with the circuit breaker change operation line, a fault line is marked, and the zero sequence current I of the non-fault operation line is marked N0 initial Change to I N0 failure The value, then end; if not, storing the data which does not meet one of the three conditions in the step A and is not filled with I N0 failure Give I N0 initial Zero sequence current I of the running line of (2) N0 initial And (5) ending.
As shown in fig. 2, if the ground fault duration is 3 or more in the step B2, the second operation step is performed as follows:
b2-1, judging whether the running line breaker 1 is changed to 0, if not, ending; if yes, entering the next step;
b2-2, storage bus voltage (U) a 、U b 、U c 、3U 0 ) Line running state, line load I under fault state LN2 Zero sequence current I N0 failure 2 ；
B2-3, judging whether an arc suppression coil exists or not, and if so, comparing the running lines to meet the following conditions: i N0 failure 2 -I N0 initial ≠0，MAX(I N0 failure 2 -I N0 failure ) Outputting a line ID, sending out an alarm instruction and ending; if not, the run line comparison satisfies: i N0 failure 2 -I N0 initial ≠0，MAX(I NO fault 2 ) And MAX (I) N0 failure 2 -I N0 failure ) Otherwise, outputting the line ID, sending out an alarm instruction and ending.
The small current grounding system of the invention is as follows: the neutral point is not grounded or is grounded through the arc suppression coil and high impedance, and is also called as neutral point indirect grounding system. When a phase fails to ground, the ground fault current tends to be much less than the load current, and such a system is referred to as a "low current ground system" because a short circuit loop cannot be constructed. The method comprises the steps of collecting zero sequence current, line running state and load of a power distribution network line on the unattended transformer station site through a transformer station measurement and control device, uploading the zero sequence current, the line running state and the load to a dispatching end, distinguishing whether arc suppression coils are configured or not by utilizing the line running state and the zero sequence current steady state, comparing the line running zero sequence current values of other lines with the bus historical ground faults, transversely comparing the zero sequence current values of the running lines of the ground faults, automatically selecting a fault line, reminding a dispatcher of paying attention in an alarm mode, and providing a new method for automatically selecting single-phase ground faults of a small-current grounding system at the regulation end, and improving the accuracy and the rapidity of single-phase grounding fault line selection in the small-current grounding system.
10 kilovolt bus voltage data (Ua, ub,Uc, 3U 0), distribution network equipment operation data (measurement data such as P, Q, I, 3I 0 The method comprises the steps of acquiring position states such as a breaker, an isolating switch, a grounding disconnecting switch and the like) arc suppression coil equipment operation data (measurement data such as compensation inductance current I, capacitance current I, neutral point current I and the like, position states such as the breaker, the isolating switch and the like), bus single-phase grounding alarm information and the like through a transformer substation measurement and control device, sending the acquired data to a dispatching end SCADA system, enabling the dispatching end automatic line selection system to be interfaced with the SCADA system, tracking bus voltage data (Ua, ub, uc and 3U 0) in real time, utilizing three modes such as 3U0 is larger than 15V, or three-phase voltages, two of which are larger than 7kV and the other phase is lower than 5kV, or bus grounding action and the like, taking the three modes as starting judgment conditions, judging that single-phase grounding fault occurs in two calculation periods, comprehensively analyzing the current value after each zero sequence operation feeder line fault and the line operation zero sequence current value at the same time of the historical grounding fault time of other bus lines, giving out the alarm of the grounding fault line according to the possibility, pushing the SCADA system and the light word, reminding a dispatcher of automatic dispatching operator to pay attention, realizing the automatic attention, and improving the accuracy of the fault rate and the line selection accuracy of the line selection fault through the line selection and the line selection fault rate.
The above embodiments are merely illustrative embodiments of the present invention, but the technical features of the present invention are not limited thereto, and any changes or modifications made by those skilled in the art within the scope of the present invention are included in the scope of the present invention.
Claims (1)
1. A small-current single-phase grounding automatic line selection method of a dispatching-end transformer substation is characterized by comprising the following steps of:
the method comprises the following steps:
A. judging whether one of the following three conditions is satisfied: zero sequence voltage 3U 0 >15V; alternatively, the phase voltage (U 1 ，U 2 )>7kV and U3<5kV; alternatively, the bus bar is grounded and the calculation cycle=2 is continued; if the condition is met, executing the B1, and if the condition is not met, executing the B2;
b1, storage bus voltage (U) a 、U b 、U c 、3U 0 ) Recording the running state of the line and the line load I under the fault state LN Zero sequence current I of line at fault moment N0 failure Step C1 is entered;
and C1, comparing and satisfying the operation line: i N0 failure -I N0 initial ≠0，MAX(I NO fault ) And MAX (I) N0 failure -I N0 initial ) Otherwise MAX (2×I) N0 failure -I N0 initial ) Outputting a line ID, sending out an alarm instruction and ending; wherein I is N0 initial The initial zero sequence current of the line before failure;
b2, judging whether the ground fault duration is greater than or equal to 3, if so, performing a second operation step B2-1 to B2-3; if not, entering a step C2;
b2-1, judging whether the running line breaker 1 is changed to 0, if not, ending; if yes, entering the next step;
b2-2, storage bus voltage (U) a 、U b 、U c 、3U 0 ) Line running state, line load I under fault state LN2 Zero sequence current I N0 failure 2 ；
B2-3, judging whether an arc suppression coil exists or not, and if so, comparing the running lines to meet the following conditions: i N0 failure 2 -I N0 initial ≠0，MAX(I N0 failure 2 -I N0 failure ) Outputting a line ID, sending out an alarm instruction and ending; if not, the run line comparison satisfies: i N0 failure 2 -I N0 initial ≠0，MAX(I NO fault 2 ) And MAX (I) N0 failure 2 -I N0 failure ) Outputting a line ID, sending out an alarm instruction and ending;
c2, judging whether the earth fault duration period is changed to 0, and the operating circuit breaker 1 is changed to 0; if yes, the output line ID is consistent with the circuit breaker change operation line, a fault line is marked, and the zero sequence current I of the non-fault operation line is marked N0 initial Change to I N0 failure The value, then end; if not, storing the data which does not meet one of the three conditions in the step A and is not filled with I N0 failure Give I N0 initial Zero sequence current I of the running line of (2) N0 initial And (5) ending.
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| CN113866677B (en) * | 2021-10-15 | 2024-04-05 | 贵州电网有限责任公司 | SCADA data-based ground fault removal correctness checking method |
| CN113922326B (en) * | 2021-10-15 | 2022-09-09 | 贵州电网有限责任公司 | Bus/line grounding line selection wheel cutting method based on SCADA data |
| CN113884942B (en) * | 2021-10-15 | 2024-04-05 | 贵州电网有限责任公司 | SCADA data-based grounding line selection alarm correctness checking method |
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