CN112731066A - Self-adaptive ground fault protection method - Google Patents
Self-adaptive ground fault protection method Download PDFInfo
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- CN112731066A CN112731066A CN202011642294.XA CN202011642294A CN112731066A CN 112731066 A CN112731066 A CN 112731066A CN 202011642294 A CN202011642294 A CN 202011642294A CN 112731066 A CN112731066 A CN 112731066A
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000001514 detection method Methods 0.000 claims abstract description 121
- 230000000630 rising effect Effects 0.000 claims description 14
- 230000003044 adaptive effect Effects 0.000 claims description 12
- 238000012360 testing method Methods 0.000 claims description 8
- 230000001052 transient effect Effects 0.000 claims description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000003247 decreasing effect Effects 0.000 description 5
- 238000003745 diagnosis Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000003827 upregulation Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000002222 downregulating effect Effects 0.000 description 1
- 230000003828 downregulation Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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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
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/185—Electrical failure alarms
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- Physics & Mathematics (AREA)
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- Business, Economics & Management (AREA)
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention relates to the field of single-phase earth fault on-site study and judgment and discloses a self-adaptive earth fault protection method. The method comprises the following steps: setting a corresponding fault study and judgment standard value aiming at the operation parameter of the detection node, and controlling the power distribution detection equipment to send a corresponding fault alarm indication when the operation parameter meets the fault study and judgment standard value; the method comprises the steps of obtaining the number of times of false sending of fault alarm indication sent by power distribution detection equipment when a detection node fails, or the number of times of missed sending of fault alarm indication not sent by the power distribution detection equipment when the detection node fails, and correspondingly adjusting a fault study and judgment standard value according to the number of times of false sending or the number of times of missed sending. The technical scheme of the invention has the beneficial effects that: the invention provides a self-adaptive ground fault protection method which is applied to a power distribution terminal of a power distribution network, and can correspondingly adjust a fault study and judgment standard value according to the missed times or the mistaken times of power distribution detection equipment so as to realize more accurate fault alarm.
Description
Technical Field
The invention relates to the field of single-phase earth fault on-site study and judgment and discloses a self-adaptive earth fault protection method.
Background
The study and judgment of the small current single-phase earth fault of the neutral point indirect earth power system is a difficult problem which puzzles the industry for a long time, and the prior art generally only adopts a self-adaptive earth line selection technology on an earth line selection device in a transformer substation for studying and judging and selecting the line with the single-phase earth fault and does not relate to the on-site self-adaptive study and judgment of the single-phase earth fault of a power distribution terminal.
Moreover, for the section selection of the single-phase earth fault of the distribution network line, the prior art generally adopts a master station adaptive research and judgment technology based on fault recording, however, although the research and judgment technology based on fault recording is a relatively mature technology, in practical application, there are many restrictive conditions, for example, requirements such as real-time synchronism of fault recording between different sampling points and different sampling phases, stability of communication quality, centralized concurrent processing capability of the master station, and the like, which are contradictory to the field actual conditions of the distribution line, especially the overhead line, and therefore, the success of practical application is not ideal.
Disclosure of Invention
In view of the above problems in the prior art, a self-adaptive ground fault protection method is provided, which is applied to a power distribution network, where the power distribution network includes a plurality of circuits, a plurality of detection nodes located on the circuits, and power distribution detection equipment;
presetting a fault study and judgment standard value, wherein the power distribution detection equipment is used for acquiring the operation parameters of the detection node and sending a fault alarm indication when the operation parameters meet the fault study and judgment standard value;
the adaptive ground fault protection method comprises the following steps:
obtaining the false sending times of the fault alarm indication when the detection node of the power distribution detection equipment fails, or
When the detection node fails, the power distribution detection equipment misses sending times of the fault alarm indication;
and correspondingly adjusting the fault studying and judging standard value according to the false sending times or the missed sending times.
Preferably, the operating parameters include:
a ground voltage of the detection node, and
and detecting the steady-state zero sequence current of the node.
Preferably, the ground voltage includes:
the rising proportion of the two-phase voltage of the detection node and the falling proportion of the other-phase voltage of the detection node are respectively controlled; or
And detecting the steady-state zero sequence voltage of the node.
Preferably, the fault diagnosis value includes:
a voltage set value corresponding to a ground voltage of the detection node, an
A current set value corresponding to a steady state zero sequence current of the detection node.
Preferably, the voltage set value includes:
a first set value corresponding to a rising ratio of two-phase voltages of the detection node and a falling ratio of the other-phase voltage; or
And a second set value corresponding to the steady-state zero sequence voltage of the detection node.
Preferably, the method comprises the following steps:
step A1, presetting a testing time interval, acquiring the operating parameters of the power distribution detection equipment meeting the fault judging standard value when the detection node does not have a fault in the testing time interval, and sending the times of false sending of fault alarm indication;
step a2, determining whether the number of false positives exceeds a preset false negatives threshold:
if so, adjusting the fault study and judgment standard value;
if not, the process is exited.
Preferably, the method comprises the following steps:
step B1, presetting a checking time interval, and acquiring the times of missed sending of fault alarm indication when the power distribution detection equipment fails at the detection node in the checking time interval and the operation parameters do not meet the fault study and judgment standard value;
step B2, judging whether the missed sending times exceeds a preset missed sending threshold:
if so, adjusting the fault study and judgment standard value downwards;
if not, the process is exited.
Preferably, the operating parameters further include:
a current direction of the sense node, and a transient power direction of the sense node.
Preferably, the fault diagnosis value further includes:
a current reference direction corresponding to a current direction of the sense node, and a power reference direction corresponding to a transient power direction of the sense node.
The technical scheme of the invention has the beneficial effects that: the invention provides a self-adaptive ground fault protection method which is applied to a power distribution terminal of a power distribution network, and can correspondingly adjust a fault study and judgment standard value according to the missed times or the mistaken times of power distribution detection equipment so as to realize more accurate fault alarm.
Drawings
FIG. 1 is a schematic flow chart of a standard value for up-regulation fault diagnosis according to a preferred embodiment of the present invention;
fig. 2 is a schematic flow chart of the method for adjusting the fault diagnosis criteria according to the preferred embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and detailed description, but is not intended to be limited thereto.
The invention provides a self-adaptive ground fault protection method which is applied to a power distribution network, wherein the power distribution network comprises a plurality of circuits, a plurality of detection nodes positioned on the circuits and power distribution detection equipment;
presetting a fault study and judgment standard value, wherein the power distribution detection equipment is used for acquiring the operation parameters of the detection node and sending a fault alarm indication when the operation parameters meet the fault study and judgment standard value;
the adaptive ground fault protection method comprises the following steps:
obtaining the false sending times of the fault alarm indication when the detection node of the power distribution detection equipment fails, or
When the detection node fails, the power distribution detection equipment misses sending times of the fault alarm indication;
and correspondingly adjusting the fault studying and judging standard value according to the false sending times or the missed sending times.
In particular, in view of the failure in the prior art, the invention provides a self-adaptive ground fault protection method, which is applied to a power distribution terminal of a power distribution network, and generally speaking, when an operating parameter of a detection node arranged in the power distribution network meets a fault study and judgment standard value, power distribution detection equipment sends a corresponding fault alarm indication to complete an alarm indication during ground fault; however, the invention considers the reasons of different operating environments of the power distribution network, inaccurate set fault study and judgment standard values and the like, and also causes the situation that the power distribution detection equipment mistakenly sends fault alarm indication when the detection node fails, or the situation that the power distribution detection equipment fails to send fault alarm indication when the detection node fails. Therefore, the fault study and judgment standard value is correspondingly adjusted according to the missed times or the false times of the power distribution detection equipment, so that more accurate fault alarm is realized.
In a preferred embodiment of the invention, the operating parameters include:
detecting the ground voltage of the node, an
And detecting the steady-state zero sequence current of the node.
In a preferred embodiment of the present invention, the fault study and judgment criterion value comprises:
a voltage set value corresponding to a ground voltage of the detection node, an
And the current set value of the steady-state zero-sequence current corresponding to the detection node.
Specifically, when single-phase ground fault detection is performed, the operation parameters of the detection node may include a ground voltage of the detection node and a steady-state zero-sequence current of the detection node, and the correspondingly set fault study and judgment standard value may include a voltage set value corresponding to the ground voltage of the detection node and a current set value corresponding to the steady-state zero-sequence current of the detection node, that is, when it is determined that the ground voltage of the detection node is greater than the voltage set value and the steady-state zero-sequence current of the detection node is greater than the current set value, the power distribution detection device determines that a single-phase ground fault occurs in the detection node, that is, sends an alarm indication; and when the grounding voltage of the detection node is not greater than the voltage set value or the steady-state zero-sequence current of the detection node is not greater than the current set value and one of the conditions is met, the power distribution detection equipment judges that the detection node has no single-phase grounding fault, namely, does not send an alarm indication.
In a preferred embodiment of the present invention, the ground voltage in the operation parameters includes:
detecting the rising proportion of the two-phase voltage of the node and the falling proportion of the other-phase voltage; or
And detecting the steady-state zero sequence voltage of the node.
In a preferred embodiment of the present invention, the voltage setting value in the fault diagnosis criterion value comprises:
a first set value corresponding to a rising ratio of the two-phase voltages of the detection node and a falling ratio of the other-phase voltage; or
And a second set value corresponding to the steady-state zero sequence voltage of the detection node.
Specifically, when detecting a single-phase ground fault, obtaining the operating parameters of the detection node may include: the correspondingly set fault studying and judging standard values of the rising proportion of the two-phase voltage of the detection node, the decreasing proportion of the other-phase voltage, the steady-state zero-sequence voltage of the detection node and the steady-state zero-sequence current of the detection node may include: a first setting value of the rising ratio of the two-phase voltage corresponding to the detection node and the lowering ratio of the other-phase voltage, a second setting value of the steady-state zero-sequence voltage corresponding to the detection node and a current setting value of the steady-state zero-sequence current corresponding to the detection node,
specifically, the detection and judgment of the ground voltage of the detection node may include a rising ratio of the two-phase voltage of the detection node to a decreasing ratio of the other-phase voltage, and a steady-state zero-sequence voltage of the detection node, and the correspondingly set fault study criterion value may include a first set value corresponding to the rising ratio of the two-phase voltage of the detection node to the decreasing ratio of the other-phase voltage, and a second set value corresponding to the steady-state zero-sequence voltage of the detection node. That is, when it is determined that the rising ratio of the two-phase voltage of the detection node to the lowering ratio of the other-phase voltage is greater than a first set value, or the steady-state zero-sequence voltage of the detection node is greater than a second set value, the power distribution detection device determines that a single-phase ground fault occurs at the detection node, that is, sends an alarm indication; and only when the rising proportion of the two-phase voltage of the detection node and the reduction proportion of the other-phase voltage are judged to be not more than a first set value and the steady-state zero-sequence voltage of the detection node is not more than a second set value, and the two conditions are met, the power distribution detection equipment judges that the detection node does not have single-phase earth fault and does not send an alarm indication.
As shown in fig. 1, a preferred embodiment of the present invention includes:
step A1, presetting a testing time interval, acquiring the testing time interval, judging that the operation parameters meet the fault study and judgment standard value when the power distribution detection equipment does not have faults at the detection node, and sending the times of false sending of fault alarm indication;
step a2, determining whether the number of false positives exceeds a preset false negatives threshold:
if yes, adjusting the fault study and judgment standard value;
if not, the process is exited.
Specifically, in a preset calibration period, if the condition that multiple fault alarm indications are sent by mistake exists, namely the detection node operates normally and does not go wrong, the power distribution detection equipment judges that the operation parameters at the detection node meet the fault study and judgment standard value for multiple times, and when the detection node fails and the corresponding multiple fault alarm indications are sent by mistake, the fault study and judgment standard value is adjusted upwards, so that the operation parameters of the detection node under the normal condition can not meet the fault study and judgment standard value easily any more, and the times of sending by mistake of the power distribution equipment are reduced.
Further, based on the above description, the up-regulation of the fault study criterion value may be achieved by up-regulating a first set value of a rising ratio of two-phase voltages corresponding to the detection node to a decreasing ratio of the other-phase voltage, a second set value of a steady-state zero-sequence voltage corresponding to the detection node, and a current set value of a steady-state zero-sequence current corresponding to the detection node.
As shown in fig. 2, the preferred embodiment of the present invention includes:
step B1, presetting a test time interval, and acquiring the times of missed sending of fault alarm indication when the power distribution detection equipment judges that the operation parameters do not meet the fault study and judgment standard value and does not send the fault alarm indication when the detection node has a fault in the test time interval;
step B2, judging whether the number of missed sending exceeds a preset missed sending threshold:
if so, adjusting the fault study and judgment standard value downwards;
if not, the process is exited.
Specifically, in a preset calibration period, if a condition of missed fault alarm indication exists for multiple times, namely a detection node fails, the power distribution detection equipment judges that the operation parameters at the detection node do not meet the fault study standard value for multiple times, and considers that no fault occurs at the detection node, so that the fault study standard value is adjusted downwards when the fault alarm indication fails for multiple times, so that the operation parameters of the detection node under the fault condition can meet the fault study standard value, and the missed fault frequency of the power distribution equipment is reduced.
Further, based on the above description, the down-regulation of the fault study criterion value may be achieved by down-regulating a first set value corresponding to the rising ratio of the two-phase voltage of the detection node to the decreasing ratio of the other-phase voltage, a second set value corresponding to the steady-state zero-sequence voltage of the detection node, and a current set value corresponding to the steady-state zero-sequence current of the detection node.
In a preferred embodiment of the invention, the operating parameters further comprise:
detecting a current direction of the node, and detecting a transient power direction of the node.
In a preferred embodiment of the present invention, the fault analysis and judgment criterion value further includes:
a current reference direction corresponding to the current direction of the sense node, and a power reference direction corresponding to the transient power direction of the sense node.
The technical scheme of the invention has the beneficial effects that: the invention provides a self-adaptive ground fault protection method which is applied to a power distribution terminal of a power distribution network, and can correspondingly adjust a fault study and judgment standard value according to the missed times or the mistaken times of power distribution detection equipment so as to realize more accurate fault alarm.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (9)
1. A self-adaptive ground fault protection method is applied to a power distribution network and is characterized in that the power distribution network comprises a plurality of circuits, a plurality of detection nodes positioned on the circuits and power distribution detection equipment;
presetting a fault study and judgment standard value, wherein the power distribution detection equipment is used for acquiring the operation parameters of the detection node and sending a fault alarm indication when the operation parameters meet the fault study and judgment standard value;
the adaptive ground fault protection method comprises the following steps:
obtaining the false sending times of the fault alarm indication when the detection node of the power distribution detection equipment fails, or
When the detection node fails, the power distribution detection equipment misses sending times of the fault alarm indication;
and correspondingly adjusting the fault studying and judging standard value according to the false sending times or the missed sending times.
2. The adaptive ground fault protection method of claim 1, wherein the operating parameters comprise:
a ground voltage of the detection node, and
and detecting the steady-state zero sequence current of the node.
3. The adaptive ground fault protection method of claim 2, wherein the ground voltage in the operating parameters comprises:
the rising proportion of the two-phase voltage of the detection node and the falling proportion of the other-phase voltage of the detection node are respectively controlled; or
And detecting the steady-state zero sequence voltage of the node.
4. The adaptive ground fault protection method of claim 1, wherein the fault study criteria value comprises:
a voltage set value corresponding to a ground voltage of the detection node, an
A current set value corresponding to a steady state zero sequence current of the detection node.
5. The adaptive ground fault protection method of claim 4, wherein the voltage set-point in the fault study criteria value comprises:
a first set value corresponding to a rising ratio of two-phase voltages of the detection node and a falling ratio of the other-phase voltage; or
And a second set value corresponding to the steady-state zero sequence voltage of the detection node.
6. The adaptive ground fault protection method of claim 1, comprising:
step A1, presetting a testing time interval, acquiring the operating parameters of the power distribution detection equipment meeting the fault judging standard value when the detection node does not have a fault in the testing time interval, and sending the times of false sending of fault alarm indication;
step a2, determining whether the number of false positives exceeds a preset false negatives threshold:
if so, adjusting the fault study and judgment standard value;
if not, the process is exited.
7. The adaptive ground fault protection method of claim 1, comprising:
step B1, presetting a checking time interval, and acquiring the times of missed sending of fault alarm indication when the power distribution detection equipment fails at the detection node in the checking time interval and the operation parameters do not meet the fault study and judgment standard value;
step B2, judging whether the missed sending times exceeds a preset missed sending threshold:
if so, adjusting the fault study and judgment standard value downwards;
if not, the process is exited.
8. The adaptive ground fault protection method of claim 1, wherein the operating parameters further comprise:
a current direction of the sense node, and a transient power direction of the sense node.
9. The adaptive ground fault study method according to claim 1, wherein the fault study criterion value further comprises:
a current reference direction corresponding to a current direction of the sense node, and a power reference direction corresponding to a transient power direction of the sense node.
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Application publication date: 20210430 |
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| RJ01 | Rejection of invention patent application after publication |