CN113917261A - Direct current protection equipment-oriented differential protection parameter verification method and device - Google Patents
Direct current protection equipment-oriented differential protection parameter verification method and device Download PDFInfo
- Publication number
- CN113917261A CN113917261A CN202111163581.7A CN202111163581A CN113917261A CN 113917261 A CN113917261 A CN 113917261A CN 202111163581 A CN202111163581 A CN 202111163581A CN 113917261 A CN113917261 A CN 113917261A
- Authority
- CN
- China
- Prior art keywords
- current
- value
- protection
- differential
- protection device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000012795 verification Methods 0.000 title claims abstract description 35
- 238000012360 testing method Methods 0.000 claims abstract description 149
- 230000009471 action Effects 0.000 claims description 66
- 230000006870 function Effects 0.000 claims description 25
- 238000004364 calculation method Methods 0.000 claims description 19
- 238000004590 computer program Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 abstract description 16
- 238000012423 maintenance Methods 0.000 abstract description 5
- 230000000875 corresponding effect Effects 0.000 description 56
- 238000004088 simulation Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009993 protective function Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
-
- 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
- H02H7/268—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 dc systems
-
- 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
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention relates to the technical field of operation control and protection of a direct-current power distribution network, and discloses a differential protection parameter calibration method and device for direct-current protection equipment. The method and the device of the invention carry out the test by inputting the linear increasing current twice to the direct current control protection equipment so as to obtain the current value corresponding to the output differential current out-of-limit alarm signal of the direct current control protection equipment in each test, calculate the output delay and differential current fixed value of the output differential current out-of-limit alarm signal according to the obtained current values twice, and verify the output delay and differential current fixed value by using the set value. By the invention, the test and verification of the differential protection function of the direct current protection device can be completed by utilizing the existing direct current protection detector under the condition of less test times, and the direct current protection device has the advantages of low detection cost and short detection period, and can meet the daily operation and maintenance detection requirements of the direct current protection device.
Description
Technical Field
The invention relates to the technical field of operation control and protection of direct-current power distribution networks, in particular to a differential protection parameter verification method and device for direct-current protection equipment.
Background
The direct current protection device is a secondary device for realizing the operation control and protection functions of a direct current distribution network, compares the current inflow and the current outflow of a protected device/line section, and controls to cut off the power supply of a fault device/line when the difference value (differential current) of the currents of the protected device/line section is larger than a differential protection set value, thereby realizing the differential protection function of the protected device/line section.
In order to ensure the normal operation of the dc protection device, it is necessary to perform a comprehensive test and verification on the differential protection function of the dc protection device. The prior art has two test and check modes:
firstly, a digital real-time simulation system is adopted to test and verify the differential protection function of the device, the detection cost is high, the period is long, and the daily operation and maintenance detection requirements of direct current protection equipment cannot be met;
secondly, a related detector is adopted to judge whether the direct current protection equipment can correctly act under the condition of inputting a test waveform, however, in this way, if the fault simulation times are less, the actual protection boundary of the direct current protection equipment is difficult to determine, and if the fault simulation times are too much, the detection period is obviously increased.
Disclosure of Invention
The invention provides a direct current protection equipment-oriented differential protection parameter verification method and device, and solves the technical problems of high detection cost and long period of the existing direct current protection equipment-oriented differential protection function test verification method.
The embodiment of the first aspect of the present invention provides a method for verifying differential protection parameters for a dc protection device, where the differential protection parameters include an output delay set value T of a differential flow out-of-limit alarm signal output by the dc protection devices1Sum and difference flow constant value set value Is1The method comprises the following steps:
inputting a first linear increasing current to a direct current control protection device, and acquiring a current value I corresponding to the output of a differential current out-of-limit alarm signal of the direct current control protection devicea1；
Inputting a second linear increasing current to the direct current protection equipment, and acquiring a current value I corresponding to the output of the differential current out-of-limit alarm signal of the direct current protection equipmenta2；
According to the current value Ia1And the current valueIa2Calculating the output delay T of the differential flow out-of-limit alarm signal output by the direct current protection equipment1Sum and difference flow constant value Ic1；
Delaying the output by T1And the output delay set value Ts1Comparing and, fixing the difference flow to a value Ic1With said difference flow setpoint Is1And comparing, and judging whether the differential flow out-of-limit alarm action of the direct current protection equipment is reliable according to the comparison result.
According to a possible implementation manner of the first aspect of the present invention, the inputting a first linearly increasing current to the dc link protection device includes:
inputting a first path of current and a second path of current to the direct current protection device;
keeping the current value of the second path of current unchanged, and linearly increasing the current value of the first path of current along with time.
According to a manner that can be realized by the first aspect of the present invention, the initial current values of the first path of current and the second path of current are set to be the rated currents of the corresponding protected devices.
According to an implementation manner of the first aspect of the present invention, the differential protection parameter further includes an output delay set value T of the low protection operation signal output by the dc protection devices2Sum and difference flow constant value set value Is2The method further comprises the following steps:
when the first linear increasing current is input to the direct current control protection equipment, acquiring a current value I corresponding to the direct current control protection equipment when outputting a low value protection action signala1' and when a second linear increasing current is input into the direct current protection device, acquiring a current value I corresponding to the direct current protection device when outputting a low value protection action signala2′；
According to the current value Ia1' and the current value Ia2' calculating the output delay T of the low value protection action signal output by the direct current protection device2Sum and difference flow constant value Ic2；
Delaying the output by T2And the placeThe output delay set value Ts2Comparing and, fixing the difference flow to a value Ic2With said difference flow setpoint Is2And comparing, and judging whether the low-value protection action of the direct current protection equipment is reliable according to the comparison result.
According to an implementation manner of the first aspect of the present invention, the differential protection parameter further includes an output delay set value T of the high-value protection action signal output by the dc protection devices3Sum and difference flow constant value set value Is3The method further comprises the following steps:
inputting a first fast increasing current to the direct current protection device, and acquiring a current value I corresponding to the direct current protection device when outputting a high value protection action signala3；
Inputting a second fast increasing current to the direct current protection device, and acquiring a current value I corresponding to the direct current protection device outputting a high value protection action signala4；
According to the current value Ia3And the current value Ia4Calculating the output delay T of the high-value protection action signal output by the direct current protection equipment3Sum and difference flow constant value Ic3；
Delaying the output by T3And the output delay set value Ts3Comparing and, fixing the difference flow to a value Ic3With said difference flow setpoint Is3And comparing, and judging whether the high-value protection action of the direct current protection equipment is reliable or not according to the comparison result.
According to a manner that can be realized by the first aspect of the present invention, the current increase rate of the first rapidly increasing current satisfies:
in the formula ,k3A current increase rate representative of the first rapidly increasing current;
the current increase rate of the second fast-increase current satisfies:
in the formula ,k4A current increase rate representing the second rapidly increasing current.
According to an enabling aspect of the first aspect of the invention, the differential protection parameters further comprise a differential protection slope set-point, the method further comprising:
inputting two paths of current to the direct current control protection equipment, wherein the initial values of the two paths of current are set as the rated currents corresponding to the protected equipment;
and testing the direct current protection equipment for three times, and adjusting the current value of one path of current to be a first current set value during the first test so as to obtain a corresponding differential current test value IdzAnd a brake current test value IzdWherein the first current set point is less than the difference current set point Ic1(ii) a Adjusting the current value of one path of current to be a second current set value during the second test to obtain a corresponding differential current test value IdzAnd a brake current test value Izd2The second current set value is smaller than the difference current set value Ic2And is greater than the differential flow constant Ic1(ii) a Adjusting the current value of one path of current to be a third current set value during the third test to obtain a corresponding differential current test value Idz3And a brake current test value IzdSaid third current set value is less than said differential current set value Ic3And is greater than the differential flow constant Ic2；
Testing value I according to the differential currentdz1Brake current test value IzdDifferential current test value Idz2Brake current test value IzdDifferential current test value Idz3And a brake current test value Izd3Calculating the differential protection slope of the direct current protection equipment;
and comparing the differential protection slope with the differential protection slope set value, and outputting a corresponding comparison result.
According to a possible implementation manner of the first aspect of the present invention, the differential protection slope of the dc protection device is calculated according to the following formula:
wherein
in the formula ,kdRepresenting a differential protection slope of the dc protection device.
The present invention provides, in a second aspect, a differential protection parameter calibration apparatus for a dc protection device, where the differential protection parameter includes an output delay set value T of a differential flow out-of-limit alarm signal output by the dc protection devices1Sum and difference flow constant value set value Is1The device comprises:
a first test module, configured to input a first linear increasing current to a dc protection device, and obtain a current value I corresponding to the output of the differential current out-of-limit alarm signal by the dc protection devicea1；
A second test module, configured to input a second linearly increasing current to the dc protection device, and obtain a current value I corresponding to the output of the differential current out-of-limit alarm signal by the dc protection devicea2；
First of allA calculation module for calculating the current value Ia1And the current value Ia2Calculating the output delay T of the differential flow out-of-limit alarm signal output by the direct current protection equipment1Sum and difference flow constant value Ic1；
A first differential protection function analysis module for delaying the output by T1And the output delay set value Ts1Comparing and, fixing the difference flow to a value Ic1With said difference flow setpoint Is1And comparing, and judging whether the differential flow out-of-limit alarm action of the direct current protection equipment is reliable according to the comparison result.
According to one enabling aspect of the second aspect of the invention, the first testing module comprises:
the current input unit is used for inputting a first path of current and a second path of current to the direct current protection device;
and the current adjusting unit is used for keeping the current value of the second path of current unchanged and linearly increasing the current value of the first path of current along with time.
According to a manner that the second aspect of the present invention can be realized, the initial current values of the first path of current and the second path of current are set to be the rated currents of the corresponding protected devices.
According to an implementation manner of the second aspect of the present invention, the differential protection parameter further includes an output delay set value T of the low protection operation signal output by the dc protection devices2Sum and difference flow constant value set value Is2The device further comprises:
a third testing module, configured to obtain, when the first linear increasing current is input to the dc protection device, a current value I corresponding to the output of the low-value protection action signal by the dc protection devicea1′；
A fourth test module, configured to, when a second linear increasing current is input to the dc protection device, obtain a current value I corresponding to when the dc protection device outputs a low-value protection action signala2′；
A second calculation module for calculating the current value Ia1' and the current value Ia2' calculating the output delay T of the low value protection action signal output by the direct current protection device2Sum and difference flow constant value Ic2；
A second differential protection function analysis module for delaying the output by T2And the output delay set value Ts2Comparing and, fixing the difference flow to a value Ic2With said difference flow setpoint Is2And comparing, and judging whether the low-value protection action of the direct current protection equipment is reliable according to the comparison result.
According to an implementation manner of the second aspect of the present invention, the differential protection parameter further includes an output delay set value T of the high protection operation signal output by the dc protection devices3Sum and difference flow constant value set value Is3The device further comprises:
a fifth testing module, configured to input a first fast increasing current to the dc protection device, and obtain a current value I corresponding to the dc protection device outputting a high-value protection action signala3；
A sixth test module, configured to input a second fast increasing current to the dc protection device, and obtain a current value I corresponding to the dc protection device outputting the high-value protection action signala4；
A third calculation module for calculating the current value Ia3And the current value Ia4Calculating the output delay T of the high-value protection action signal output by the direct current protection equipment3Sum and difference flow constant value Ic3；
A third differential protection function analysis module for delaying the output by T3And the output delay set value Ts3Comparing and, fixing the difference flow to a value Ic3With said difference flow setpoint Is3And comparing, and judging whether the high-value protection action of the direct current protection equipment is reliable or not according to the comparison result.
According to a manner enabled by the second aspect of the present invention, the current increase rate of the first fast increasing current satisfies:
in the formula ,k3A current increase rate representative of the first rapidly increasing current;
the current increase rate of the second fast-increase current satisfies:
in the formula ,k4A current increase rate representing the second rapidly increasing current.
According to a second aspect of the invention, in an implementation manner, the differential protection parameters further include a differential protection slope setting value, and the apparatus further includes:
the current input module is used for inputting two paths of current to the direct current control protection equipment, and the initial values of the two paths of current are set as the rated currents corresponding to the protected equipment;
a seventh test module, configured to perform three tests on the dc protection device, where during the first test, the current value of one of the paths of current is adjusted to be a first current setting value, so as to obtain a corresponding differential current test value Idz1And a brake current test value Izd1Wherein the first current set point is less than the difference current set point Ic1(ii) a Adjusting the current value of one path of current to be a second current set value during the second test to obtain a corresponding differential current test value IdzAnd a brake current test value Izd2The second current set value is smaller than the difference current set value Ic2And is greater than the differential flow constant Ic1(ii) a Adjusting the current value of one path of current to be a third current set value during the third test to obtain a corresponding differential current test value Idz3And a brake current test value IzdSaid third current set value is less than said differential current set value Ic3And is greater than the differential flow constant Ic2；
Fourth step ofA calculation module for calculating the differential current test value IdzBrake current test value IzdDifferential current test value Idz2Brake current test value IzdDifferential current test value Idz3And a brake current test value Izd3Calculating the differential protection slope of the direct current protection equipment;
and the fourth differential protection function analysis module is used for comparing the differential protection slope with the differential protection slope set value and outputting a corresponding comparison result.
According to a manner of implementation of the second aspect of the present invention, the differential protection slope of the dc protection device is calculated according to the following formula:
wherein
in the formula ,kdRepresenting a differential protection slope of the dc protection device.
A third aspect of the present invention provides a differential protection parameter calibration apparatus for a dc protection device, including:
a memory to store instructions; the instruction is an instruction which can implement the steps of the differential protection parameter verification method for the direct current protection device in any one of the realizable manners;
a processor to execute the instructions in the memory.
A fourth aspect of the present invention provides a computer-readable storage medium, which stores thereon a computer program, and when the computer program is executed by a processor, the computer program implements the steps of the dc protection device-oriented differential protection parameter verification method according to any one of the above implementable manners.
According to the technical scheme, the invention has the following advantages:
the invention carries out the test by inputting the linear increasing current twice to the direct current control protection device so as to obtain the current value corresponding to the output differential current out-of-limit alarm signal of the direct current control protection device in each test, calculates the output delay and differential current fixed value of the output differential current out-of-limit alarm signal according to the obtained current values twice, and verifies the output delay and differential current fixed value by using the set value, thereby realizing the test verification of the differential protection function of the direct current control protection device; by the invention, the test and verification of the differential protection function of the direct current protection device can be completed by utilizing the existing direct current protection detector under the condition of less test times, and the direct current protection device has the advantages of low detection cost and short detection period, and can meet the daily operation and maintenance detection requirements of the direct current protection device.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic diagram illustrating a differential protection principle of a dc current protection device according to an alternative embodiment of the present invention;
fig. 2 is a flowchart of a differential protection parameter checking method for a dc protection device according to an alternative embodiment of the present invention;
fig. 3 is a schematic structural connection diagram of a differential protection parameter verification apparatus for a dc protection device according to an alternative embodiment of the present invention.
Reference numerals:
1-a first test module; 2-a second test module; 3-a first calculation module; 4-a first differential protection function analysis module.
Detailed Description
The embodiment of the invention provides a direct current protection equipment-oriented differential protection parameter verification method and device, which are used for solving the technical problems of high detection cost and long period of the existing direct current protection equipment-oriented differential protection function test verification method.
In order to make the objects, features and advantages of the present invention more obvious and understandable, 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 obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, in the embodiments of the present invention, there are descriptions related to "first", "second", etc., and the descriptions of "first", "second", etc. are only used for descriptive purposes and are not to be interpreted as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
It should be noted that the method and apparatus of the following embodiments of the present inventionThe parameter verification for two-stage type ratio brake differential protection is shown in FIG. 1, wherein IdzRepresents a differential current, IzdDenotes the braking current, IcdRepresenting the differential protection startup current. When the direct current protection device is operated reliably, the direct current protection device outputs a protection action signal when the following conditions (namely, the action zone shown in fig. 1) are met, and does not output the protection action signal when the following conditions (namely, the braking zone shown in fig. 1) are not met:
in the formula ,kdRepresenting the differential protection slope of a DC protection device, wherein Idz＝|Ia-Ib|,Izd＝|Ia+Ib|，IaFor the inflow of current to the protected equipment/line section, IbIs the outgoing current of the protected equipment/line segment.
The direct current protection equipment for which the method and the device are oriented has the following three-section type delay outlet function:
when the differential current is larger than the set value I of the differential constant values1When the current is over-limit, the DC control protection equipment outputs a differential current out-of-limit alarm signal with output delay of Ts1Wherein the difference stream constant value is set to Is1Outputting a set value of a differential current out-of-limit alarm signal for the direct current control protection equipment, Is1＝Icd；
When the differential current is larger than the set value I of the differential constant values2When the time is long, the DC control protection equipment outputs a low value protection action signal with output delay of Ts2Wherein the difference flow is set to a constant value Is2Fixing the value for the low difference flow;
when the differential current is larger than the set value I of the differential constant values3When the time is long, the DC control protection equipment outputs a high value protection action signal with output delay of Ts3Wherein the difference flow is set to a constant value Is3The head flow is fixed.
Referring to fig. 2, fig. 2 is a flowchart of a differential protection parameter verification method for a dc protection device according to an embodiment of the present invention.
Wherein the differential protection parameter comprises an output delay set value T of the differential current out-of-limit alarm signal output by the direct current protection equipments1Sum and difference flow constant value set value Is1The method comprises the following steps:
s1, inputting a first linear increasing current to the direct current control protection equipment, and acquiring a current value I corresponding to the direct current control protection equipment when outputting a differential current out-of-limit alarm signala1。
In one implementation, the inputting a first linearly increasing current to the dc link protection device includes:
inputting a first path of current and a second path of current to the direct current protection device;
keeping the current value of the second path of current unchanged, and linearly increasing the current value of the first path of current along with time.
The first path of current and the second path of current are independent currents respectively, the first path of current and the second path of current can be input to the direct current control protection device through the existing direct current control protection detector, and the initial values of the two paths of current can be set to be the rated currents corresponding to the protected device or the protected line section.
In an embodiment, when the current value of the first path of current is linearly increased with time, a smaller slope k may be adopted1The current value linearly increases along with the time, and the initial current value of the first path of current is set as INIncreased current value of IaThen, Ia＝IN+k1t, t represent time.
S2, inputting a second linear increasing current to the direct current protection device, and acquiring a current value I corresponding to the direct current protection device outputting a differential current out-of-limit alarm signala2。
When it is necessary to say, the manner of inputting the second linearly increasing current may refer to the manner of inputting the first linearly increasing current. Wherein a smaller slope k may be used2The current value linearly increases along with the time, and the initial current value of the second path of current is set as INIncreased current value of IbThen, Ib＝IN+k2t。
The method for inputting the linear increasing current is simple and rapid, and can effectively shorten the detection period.
S3 according to the current value Ia1And the current value Ia2Calculating the output delay T of the differential flow out-of-limit alarm signal output by the direct current protection equipment1Sum and difference flow constant value Ic1。
In one implementation, the output delay T1The calculation formula of (2) is as follows:
in one implementation, the difference stream constant value Ic1The calculation formula of (2) is as follows:
Ic1＝Ia1-k1×T1。
s4 delaying the output by T1And the output delay set value Ts1Comparing and, fixing the difference flow to a value Ic1With said difference flow setpoint Is1And comparing, and judging whether the differential flow out-of-limit alarm action of the direct current protection equipment is reliable according to the comparison result.
The embodiment of the invention can intelligently realize the verification of the related differential protection parameters, thereby greatly saving the manpower.
The setting value of the related differential protection parameter of the direct current protection device can be obtained by reading the setting value by a related detector.
In an embodiment, when determining whether the differential flow out-of-limit warning action of the dc protection device is reliable according to the comparison result, a corresponding first differential threshold and a second differential threshold may be set, and if the output delay T is greater than the threshold, the output delay T may be set1And the output delay set value Ts1Exceeds the first difference threshold, or the difference flow constant Ic1With said difference flow setpoint Is1Exceeds the second difference threshold, the detected DC protection device is determinedAnd if not, judging that the differential protection function of the direct current control protection equipment is complete.
It should be noted that, a corresponding verification rule may also be determined according to actual conditions, so as to analyze the test value and the set value of the differential protection parameter.
In the above embodiment of the present invention, a test is performed by inputting twice linearly increasing currents to a dc protection device, so as to obtain a current value corresponding to when the dc protection device outputs a differential current out-of-limit alarm signal in each test, calculate an output delay and a differential current fixed value of the output differential current out-of-limit alarm signal according to the obtained two current values, and verify the output delay and the differential current fixed value by using a set value, thereby implementing a test verification of a differential protection function of the dc protection device; by the invention, the test and verification of the differential protection function of the direct current protection device can be completed by utilizing the existing direct current protection detector under the condition of less test times, and the direct current protection device has the advantages of low detection cost and short detection period, and can meet the daily operation and maintenance detection requirements of the direct current protection device.
In one implementation, the differential protection parameter further includes an output delay set value T of the low-value protection operation signal output by the dc protection devices2Sum and difference flow constant value set value Is2The method further comprises the following steps:
when the first linear increasing current is input to the direct current control protection equipment, acquiring a current value I corresponding to the direct current control protection equipment when outputting a low value protection action signala1' and when a second linear increasing current is input into the direct current protection device, acquiring a current value I corresponding to the direct current protection device when outputting a low value protection action signala2′；
According to the current value Ia1' and the current value Ia2' calculating the output delay T of the low value protection action signal output by the direct current protection device2Sum and difference flow constant value Ic2；
Delaying the output by T2And the output delay set value Ts2Comparing and, fixing the difference flow to a value Ic2With said difference flow setpoint Is2And comparing, and judging whether the low-value protection action of the direct current protection equipment is reliable according to the comparison result.
When the embodiment of the invention is used for testing whether the differential current out-of-limit alarm action is reliable or not, the embodiment of the invention simultaneously tests whether the low-value protection action is reliable or not, and the obtained current value I is useda1', current value Ia2' to calculate the output delay T of the low value protection action signal output by the DC protection device2Sum and difference flow constant value Ic2The number of times of inputting linearly increased current can be omitted, so that the test number is saved, and the test period is shortened.
In particular, the output is delayed by a time T2Calculated according to the following formula:
in particular, the difference flow constant value Ic2The calculation formula of (2) is as follows:
Ic2＝Ia1′-k1×T2。
in one implementation, the differential protection parameter further includes an output delay set value T of the high-value protection operation signal output by the dc protection devices3Sum and difference flow constant value set value Is3The method further comprises the following steps:
inputting a first fast increasing current to the direct current protection device, and acquiring a current value I corresponding to the direct current protection device when outputting a high value protection action signala3；
Inputting a second fast increasing current to the direct current protection device, and acquiring a current value I corresponding to the direct current protection device outputting a high value protection action signala4；
According to the current value Ia3And the current value Ia4Calculating the output delay T of the high-value protection action signal output by the direct current protection equipment3Sum and difference flow constant value Ic3；
Delaying the output by T3And the output delay set value Ts3Comparing and, fixing the difference flow to a value Ic3With said difference flow setpoint Is3And comparing, and judging whether the high-value protection action of the direct current protection equipment is reliable or not according to the comparison result.
Because the high-value protection stage is high-value quick-break differential protection, centralized test calculation cannot be performed when linear increasing current is input, and calculation needs to be performed by separately adopting quick-rise fault difference current simulation, the calculation principle is the same as that in step S3, but the current increase rate of two tests needs to be sufficiently large, so that the difference current quickly reaches the high-value protection stage, and is prevented from being influenced by a low-value protection action signal. Therefore, the current increase rate of the first rapidly increasing current needs to satisfy the following condition:
in the formula ,k3A current increase rate representative of the first rapidly increasing current;
the current increase rate of the second rapidly increasing current satisfies the following condition:
in the formula ,k4A current increase rate representing the second rapidly increasing current.
In one implementation, the differential protection parameters further include a differential protection slope setpoint, and the method further includes:
inputting two paths of current to the direct current control protection equipment, wherein the initial values of the two paths of current are set as the rated currents corresponding to the protected equipment;
and testing the direct current protection equipment for three times, and adjusting the current value of one path of current to be a first current set value during the first test so as to obtain the corresponding current valueDifferential current test value Idz1And a brake current test value IzdWherein the first current set point is less than the difference current set point Ic1(ii) a Adjusting the current value of one path of current to be a second current set value during the second test to obtain a corresponding differential current test value Idz2And a brake current test value Izd2The second current set value is smaller than the difference current set value Ic2And is greater than the differential flow constant Ic1(ii) a Adjusting the current value of one path of current to be a third current set value during the third test to obtain a corresponding differential current test value IdzAnd a brake current test value Izd3Said third current set value is less than said differential current set value Ic3And is greater than the differential flow constant Ic2；
Testing value I according to the differential currentdz1Brake current test value Izd1Differential current test value Idz2Brake current test value IzdDifferential current test value Idz3And a brake current test value Izd3Calculating the differential protection slope of the direct current protection equipment;
and comparing the differential protection slope with the differential protection slope set value, and outputting a corresponding comparison result.
The input mode of the two currents may refer to the input mode of the current in step S1 and step S2. In specific implementation, the direct current protection detector outputs two independent currents to the direct current protection device, and initial values of the two currents are selected as rated currents of the protected device or the line section. The first current setting value enables the protection output of the direct current protection device to be within the range of the differential current out-of-limit warning stage, the second current setting value enables the protection output of the direct current protection device to be within the range of the low value protection stage, and the third current setting value enables the protection output of the direct current protection device to be within the range of the high value protection stage.
According to the embodiment of the invention, the first measuring point data (I) can be obtained through the three testsdz1,Izd) Second measurement point data (I)dz2,Izd2) And third station data (I)dz3,Izd3) And further, the differential protection slope can be calculated according to the three measuring point data.
In one implementation, the differential protection slope is calculated by a least square method, and the differential protection slope of the dc protection device is calculated according to the following formula:
wherein
in the formula ,kdRepresenting a differential protection slope of the dc protection device.
By the differential protection parameter checking method, delay and fixed value data of the differential protection of the direct current protection equipment can be analyzed and evaluated through a testing means, the data and a set value read by a detector through a communication means are mutually checked, the consistency of the set value and an actual function is checked, and the smooth development of detection, operation and maintenance work is guaranteed.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating a structural connection of a differential protection parameter checking apparatus for a dc protection device according to an alternative embodiment of the present invention.
Wherein the differential protection parameter comprises an output delay setting of the differential current out-of-limit alarm signal output by the direct current protection deviceConstant value Ts1Sum and difference flow constant value set value Is1The device comprises:
a first testing module 1, configured to input a first linearly increasing current to a dc protection device, and obtain a current value I corresponding to the dc protection device outputting a differential current out-of-limit warning signala1；
A second testing module 2, configured to input a second linearly increasing current to the dc protection device, and obtain a current value I corresponding to the output of the differential current out-of-limit alarm signal by the dc protection devicea2；
A first calculation module 3 for calculating the current value Ia1And the current value Ia2Calculating the output delay T of the differential flow out-of-limit alarm signal output by the direct current protection equipment1Sum and difference flow constant value Ic1；
A first differential protection function analysis module 4 for delaying the output by T1And the output delay set value Ts1Comparing and, fixing the difference flow to a value Ic1With said difference flow setpoint Is1And comparing, and judging whether the differential flow out-of-limit alarm action of the direct current protection equipment is reliable according to the comparison result.
In an implementable manner, the first test module 1 comprises:
the current input unit is used for inputting a first path of current and a second path of current to the direct current protection device;
and the current adjusting unit is used for keeping the current value of the second path of current unchanged and linearly increasing the current value of the first path of current along with time.
In an implementation manner, the initial current values of the first path of current and the second path of current are set to be rated currents corresponding to protected equipment.
In one implementation, the differential protection parameter further includes an output delay set value T of the low-value protection operation signal output by the dc protection devices2Sum and difference flow constant value set value Is2The device further comprises:
third testA module, configured to obtain, when the first linearly increasing current is input to a dc protection device, a current value I corresponding to when the dc protection device outputs a low-value protection operation signala1′；
A fourth test module, configured to, when a second linear increasing current is input to the dc protection device, obtain a current value I corresponding to when the dc protection device outputs a low-value protection action signala2′；
A second calculation module for calculating the current value Ia1' and the current value Ia2' calculating the output delay T of the low value protection action signal output by the direct current protection device2Sum and difference flow constant value Ic2；
A second differential protection function analysis module for delaying the output by T2And the output delay set value Ts2Comparing and, fixing the difference flow to a value Ic2With said difference flow setpoint Is2And comparing, and judging whether the low-value protection action of the direct current protection equipment is reliable according to the comparison result.
In one implementation, the differential protection parameter further includes an output delay set value T of the high-value protection operation signal output by the dc protection devices3Sum and difference flow constant value set value Is3The device further comprises:
a fifth testing module, configured to input a first fast increasing current to the dc protection device, and obtain a current value I corresponding to the dc protection device outputting a high-value protection action signala3；
A sixth test module, configured to input a second fast increasing current to the dc protection device, and obtain a current value I corresponding to the dc protection device outputting the high-value protection action signala4；
A third calculation module for calculating the current value Ia3And the current value Ia4Calculating the output delay T of the high-value protection action signal output by the direct current protection equipment3Sum and difference flow constant value Ic3；
Third differential protectorA protective function analysis module for delaying the output by T3And the output delay set value Ts3Comparing and, fixing the difference flow to a value Ic3With said difference flow setpoint Is3And comparing, and judging whether the high-value protection action of the direct current protection equipment is reliable or not according to the comparison result.
In one implementation, the first fast increasing current has a current increase rate that satisfies:
in the formula ,k3A current increase rate representative of the first rapidly increasing current;
the current increase rate of the second fast-increase current satisfies:
in the formula ,k4A current increase rate representing the second rapidly increasing current.
In one implementation, the differential protection parameters further include a differential protection slope setpoint, and the apparatus further includes:
the current input module is used for inputting two paths of current to the direct current control protection equipment, and the initial values of the two paths of current are set as the rated currents corresponding to the protected equipment;
a seventh test module, configured to perform three tests on the dc protection device, where during the first test, the current value of one of the paths of current is adjusted to be a first current setting value, so as to obtain a corresponding differential current test value Idz1And a brake current test value Izd1Wherein the first current set point is less than the difference current set point Ic1(ii) a Adjusting the current value of one path of current to be a second current set value during the second test to obtain a corresponding differential current test value Idz2And a brake current test value Izd2Said secondThe current set value is less than the differential flow set value Ic2And is greater than the differential flow constant Ic1(ii) a Adjusting the current value of one path of current to be a third current set value during the third test to obtain a corresponding differential current test value IdzAnd a brake current test value Izd3Said third current set value is less than said differential current set value Ic3And is greater than the differential flow constant Ic2；
A fourth calculation module for calculating the differential current test value Idz1Brake current test value Izd1Differential current test value Idz2Brake current test value Izd2Differential current test value Idz3And a brake current test value Izd3Calculating the differential protection slope of the direct current protection equipment;
and the fourth differential protection function analysis module is used for comparing the differential protection slope with the differential protection slope set value and outputting a corresponding comparison result.
In one implementation, the differential protection slope of the dc protection device is calculated according to the following formula:
wherein
in the formula ,kdRepresenting a differential protection slope of the dc protection device.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes and corresponding effects of the above-described apparatuses, modules and units may refer to the corresponding processes and corresponding effects in the foregoing method embodiments, and are not described herein again.
The invention also provides a differential protection parameter calibration device facing the direct current protection equipment, which is characterized by comprising the following components:
a memory to store instructions; the instruction is an instruction which can implement the steps of the differential protection parameter verification method for the direct current protection device according to any one of the above embodiments;
a processor to execute the instructions in the memory.
The present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the dc protection device-oriented differential protection parameter verification method according to any of the above embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (18)
1. A differential protection parameter checking method facing a direct current protection device,wherein the differential protection parameter comprises an output delay set value T of the differential flow out-of-limit alarm signal output by the direct current protection devices1Sum and difference flow constant value set value IS1The method comprises the following steps:
inputting a first linear increasing current to a direct current control protection device, and acquiring a current value I corresponding to the output of a differential current out-of-limit alarm signal of the direct current control protection devicea1；
Inputting a second linear increasing current to the direct current protection equipment, and acquiring a current value I corresponding to the output of the differential current out-of-limit alarm signal of the direct current protection equipmenta2；
According to the current value Ia1And the current value Ia2Calculating the output delay T of the differential flow out-of-limit alarm signal output by the direct current protection equipment1Sum and difference flow constant value Ic1；
Delaying the output by T1And the output delay set value Ts1Comparing and, fixing the difference flow to a value Ic1With said difference flow setpoint Is1And comparing, and judging whether the differential flow out-of-limit alarm action of the direct current protection equipment is reliable according to the comparison result.
2. The differential protection parameter verification method for the dc-controlled protection device according to claim 1, wherein the inputting the first linearly increasing current to the dc-controlled protection device includes:
inputting a first path of current and a second path of current to the direct current protection device;
keeping the current value of the second path of current unchanged, and linearly increasing the current value of the first path of current along with time.
3. The differential protection parameter verification method for the direct current protection device according to claim 2, wherein initial current values of the first path of current and the second path of current are set to be rated currents corresponding to the protected device.
4. According to claim1, the differential protection parameter verification method for the dc protection device is characterized in that the differential protection parameter further includes an output delay set value T of the dc protection device outputting a low value protection action signals2Sum and difference flow constant value set value Is2The method further comprises the following steps:
when the first linear increasing current is input to the direct current control protection equipment, acquiring a current value I corresponding to the direct current control protection equipment when outputting a low value protection action signala1' and when a second linear increasing current is input into the direct current protection device, acquiring a current value I corresponding to the direct current protection device when outputting a low value protection action signala2′；
According to the current value Ia1' and the current value Ia2' calculating the output delay T of the low value protection action signal output by the direct current protection device2Sum and difference flow constant value Ic2；
Delaying the output by T2And the output delay set value Ts2Comparing and, fixing the difference flow to a value Ic2With said difference flow setpoint Is2And comparing, and judging whether the low-value protection action of the direct current protection equipment is reliable according to the comparison result.
5. The method according to claim 4, wherein the differential protection parameters further include an output delay set value T of the high protection action signal output by the DC protection devices3Sum and difference flow constant value set value Is3The method further comprises the following steps:
inputting a first fast increasing current to the direct current protection device, and acquiring a current value I corresponding to the direct current protection device when outputting a high value protection action signala3；
Inputting a second fast increasing current to the direct current protection device, and acquiring a current value I corresponding to the direct current protection device outputting a high value protection action signala4；
According to the current value Ia3And the current value Ia4Calculating the output delay T of the high-value protection action signal output by the direct current protection equipment3Sum and difference flow constant value Ic3；
Delaying the output by T3And the output delay set value Ts3Comparing and, fixing the difference flow to a value Ic3With said difference flow setpoint Is3And comparing, and judging whether the high-value protection action of the direct current protection equipment is reliable or not according to the comparison result.
6. The differential protection parameter verification method for the direct current protection device according to claim 5, wherein a current increase rate of the first fast increasing current satisfies:
in the formula ,k3A current increase rate representative of the first rapidly increasing current;
the current increase rate of the second fast-increase current satisfies:
in the formula ,k4A current increase rate representing the second rapidly increasing current.
7. The dc-protection-device-oriented differential protection parameter verification method according to claim 5, wherein the differential protection parameters further include a differential protection slope setting value, and the method further comprises:
inputting two paths of current to the direct current control protection equipment, wherein the initial values of the two paths of current are set as the rated currents corresponding to the protected equipment;
and testing the direct current protection equipment for three times, and adjusting the current value of one path of current to be the first current during the first testSetting to obtain corresponding differential current test value IdzAnd a brake current test value Izd1Wherein the first current set point is less than the difference current set point Ic1(ii) a Adjusting the current value of one path of current to be a second current set value during the second test to obtain a corresponding differential current test value Idz2And a brake current test value Izd2The second current set value is smaller than the difference current set value Ic2And is greater than the differential flow constant Ic1(ii) a Adjusting the current value of one path of current to be a third current set value during the third test to obtain a corresponding differential current test value Idz3And a brake current test value Izd3Said third current set value is less than said differential current set value Ic3And is greater than the differential flow constant Ic2；
Testing value I according to the differential currentdz1Brake current test value Izd1Differential current test value Idz2Brake current test value Izd2Differential current test value Idz3And a brake current test value Izd3Calculating the differential protection slope of the direct current protection equipment;
and comparing the differential protection slope with the differential protection slope set value, and outputting a corresponding comparison result.
8. The direct current protection device-oriented differential protection parameter verification method according to claim 7, wherein the differential protection slope of the direct current protection device is calculated according to the following formula:
wherein
in the formula ,kdRepresenting a differential protection slope of the dc protection device.
9. A differential protection parameter calibration device facing a direct current protection device is characterized in that the differential protection parameter comprises an output delay set value T of a differential current out-of-limit alarm signal output by the direct current protection devices1Sum and difference flow constant value set value Is1The device comprises:
a first test module, configured to input a first linear increasing current to a dc protection device, and obtain a current value I corresponding to the output of the differential current out-of-limit alarm signal by the dc protection devicea1；
A second test module, configured to input a second linearly increasing current to the dc protection device, and obtain a current value I corresponding to the output of the differential current out-of-limit alarm signal by the dc protection devicea2；
A first calculation module for calculating the current value Ia1And the current value Ia2Calculating the output delay T of the differential flow out-of-limit alarm signal output by the direct current protection equipment1Sum and difference flow constant value Ic1；
A first differential protection function analysis module for delaying the output by T1And the output delay set value Ts1Comparing and, fixing the difference flow to a value Ic1With said difference flow setpoint Is1And comparing, and judging whether the differential flow out-of-limit alarm action of the direct current protection equipment is reliable according to the comparison result.
10. The differential protection parameter verification apparatus for dc-oriented protection devices according to claim 9, wherein the first test module comprises:
the current input unit is used for inputting a first path of current and a second path of current to the direct current protection device;
and the current adjusting unit is used for keeping the current value of the second path of current unchanged and linearly increasing the current value of the first path of current along with time.
11. The differential protection parameter verification apparatus for a direct current protection device according to claim 10, wherein initial current values of the first path of current and the second path of current are set to be rated currents corresponding to protected devices.
12. The apparatus according to claim 9, wherein the differential protection parameters further include an output delay set value T of the low protection operation signal output by the dc protection devices2Sum and difference flow constant value set value Is2The device further comprises:
a third testing module, configured to obtain, when the first linear increasing current is input to the dc protection device, a current value I corresponding to the output of the low-value protection action signal by the dc protection devicea1′；
A fourth test module, configured to, when a second linear increasing current is input to the dc protection device, obtain a current value I corresponding to when the dc protection device outputs a low-value protection action signala2′；
A second calculation module for calculating the current value Ia1' and the current value Ia2' calculating the output delay T of the low value protection action signal output by the direct current protection device2Sum and difference flow constant value Ic2；
A second differential protection function analysis module for delaying the output by T2And the said outputTime delay set value Ts2Comparing and, fixing the difference flow to a value Ic2With said difference flow setpoint Is2And comparing, and judging whether the low-value protection action of the direct current protection equipment is reliable according to the comparison result.
13. The apparatus according to claim 12, wherein the differential protection parameters further include an output delay set value T of the dc protection device outputting a high protection operation signals3Sum and difference flow constant value set value Is3The device further comprises:
a fifth testing module, configured to input a first fast increasing current to the dc protection device, and obtain a current value I corresponding to the dc protection device outputting a high-value protection action signala3；
A sixth test module, configured to input a second fast increasing current to the dc protection device, and obtain a current value I corresponding to the dc protection device outputting the high-value protection action signala4；
A third calculation module for calculating the current value Ia3And the current value Ia4Calculating the output delay T of the high-value protection action signal output by the direct current protection equipment3Sum and difference flow constant value Ic3；
A third differential protection function analysis module for delaying the output by T3And the output delay set value Ts3Comparing and, fixing the difference flow to a value Ic3With said difference flow setpoint Is3And comparing, and judging whether the high-value protection action of the direct current protection equipment is reliable or not according to the comparison result.
14. The differential protection parameter verification apparatus for a dc-oriented protection device according to claim 13, wherein a current increase rate of the first fast increasing current satisfies:
in the formula ,k3A current increase rate representative of the first rapidly increasing current;
the current increase rate of the second fast-increase current satisfies:
in the formula ,k4A current increase rate representing the second rapidly increasing current.
15. The dc protection device-oriented differential protection parameter verification apparatus according to claim 13, wherein the differential protection parameters further include a differential protection slope setting value, the apparatus further comprising:
the current input module is used for inputting two paths of current to the direct current control protection equipment, and the initial values of the two paths of current are set as the rated currents corresponding to the protected equipment;
a seventh test module, configured to perform three tests on the dc protection device, where during the first test, the current value of one of the paths of current is adjusted to be a first current setting value, so as to obtain a corresponding differential current test value Idz1And a brake current test value IzdWherein the first current set point is less than the difference current set point Ic1(ii) a Adjusting the current value of one path of current to be a second current set value during the second test to obtain a corresponding differential current test value Idz2And a brake current test value IzdThe second current set value is smaller than the difference current set value Ic2And is greater than the differential flow constant Ic1(ii) a Adjusting the current value of one path of current to be a third current set value during the third test to obtain a corresponding differential current test value Idz3And a brake current test value Izd3Said third current set value is less than said differential current set value Ic3And is greater than the differential flow constant Ic2；
A fourth calculation module for calculating the differential current test value Idz1Brake current test value Izd1Differential current test value Idz2Brake current test value Izd2Differential current test value Idz3And a brake current test value Izd3Calculating the differential protection slope of the direct current protection equipment;
and the fourth differential protection function analysis module is used for comparing the differential protection slope with the differential protection slope set value and outputting a corresponding comparison result.
16. The differential protection parameter verification apparatus for a dc protection device according to claim 15, wherein the differential protection slope of the dc protection device is calculated according to the following formula:
wherein
in the formula ,kdRepresenting a differential protection slope of the dc protection device.
17. A differential protection parameter verification apparatus for a dc protection device, comprising:
a memory to store instructions; the instructions are instructions which can implement the steps of the differential protection parameter verification method for the direct current protection device according to any one of claims 1 to 8;
a processor to execute the instructions in the memory.
18. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program, which when executed by a processor implements the steps of the dc-protection device-oriented differential protection parameter checking method according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111163581.7A CN113917261B (en) | 2021-09-30 | 2021-09-30 | Differential protection parameter verification method and device for direct current protection equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111163581.7A CN113917261B (en) | 2021-09-30 | 2021-09-30 | Differential protection parameter verification method and device for direct current protection equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113917261A true CN113917261A (en) | 2022-01-11 |
| CN113917261B CN113917261B (en) | 2023-08-04 |
Family
ID=79237711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111163581.7A Active CN113917261B (en) | 2021-09-30 | 2021-09-30 | Differential protection parameter verification method and device for direct current protection equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113917261B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005210767A (en) * | 2004-01-20 | 2005-08-04 | Fuji Electric Systems Co Ltd | Overcurrent protection system |
| CN104142448A (en) * | 2014-07-31 | 2014-11-12 | 国家电网公司 | Method for automatically checking protection functions of microcomputer main-transformer differential protection device |
| CN104798276A (en) * | 2012-11-26 | 2015-07-22 | 西门子公司 | Differential protection method and protective device for carrying out a differential protection method |
| CN105486982A (en) * | 2015-12-29 | 2016-04-13 | 安徽海兴泰瑞智能科技有限公司 | Power grid device distributed fault diagnosis method |
| CN206990753U (en) * | 2017-06-15 | 2018-02-09 | 武汉市豪迈电力自动化技术有限责任公司 | Relay protection test device based on mobile platform |
| CN107918096A (en) * | 2017-11-13 | 2018-04-17 | 鞍钢股份有限公司 | Outlet wire protecting device test method is routinely matched somebody with somebody by a kind of substation |
| US20190067928A1 (en) * | 2017-08-22 | 2019-02-28 | Siemens Aktiengesellschaft | Differential protection method, differential protective device and differential protective system |
-
2021
- 2021-09-30 CN CN202111163581.7A patent/CN113917261B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005210767A (en) * | 2004-01-20 | 2005-08-04 | Fuji Electric Systems Co Ltd | Overcurrent protection system |
| CN104798276A (en) * | 2012-11-26 | 2015-07-22 | 西门子公司 | Differential protection method and protective device for carrying out a differential protection method |
| US20150293166A1 (en) * | 2012-11-26 | 2015-10-15 | Siemens Aktiengesellschaft | Differential Protection Method and Protective Apparatus for Carrying Out a Differential Protection Method |
| CN104142448A (en) * | 2014-07-31 | 2014-11-12 | 国家电网公司 | Method for automatically checking protection functions of microcomputer main-transformer differential protection device |
| CN105486982A (en) * | 2015-12-29 | 2016-04-13 | 安徽海兴泰瑞智能科技有限公司 | Power grid device distributed fault diagnosis method |
| CN206990753U (en) * | 2017-06-15 | 2018-02-09 | 武汉市豪迈电力自动化技术有限责任公司 | Relay protection test device based on mobile platform |
| US20190067928A1 (en) * | 2017-08-22 | 2019-02-28 | Siemens Aktiengesellschaft | Differential protection method, differential protective device and differential protective system |
| CN107918096A (en) * | 2017-11-13 | 2018-04-17 | 鞍钢股份有限公司 | Outlet wire protecting device test method is routinely matched somebody with somebody by a kind of substation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113917261B (en) | 2023-08-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101331274B1 (en) | Method and device for discriminating a fault line in ungrounded distribution system | |
| Wang et al. | A novel fault let-through energy based fault location for LVDC distribution networks | |
| CN112596018B (en) | High-frequency signal-based power consumer relative position identification device, method and equipment | |
| US20100134117A1 (en) | Method and Device for Capturing a Fault in an Electrical Supply Grid | |
| CN115480204A (en) | Current transformer operation error online evaluation optimization method based on big data deduction | |
| Xu et al. | Aggregate harmonic fingerprint models of PV inverters. part 1: Operation at different powers | |
| CN113917261A (en) | Direct current protection equipment-oriented differential protection parameter verification method and device | |
| Lashkari et al. | Asynchronous motors fault detection using ANN and fuzzy logic methods | |
| CN105785230A (en) | Fault-tolerant voltage sag source positioning method | |
| KR101807280B1 (en) | Apparatus and Method for detecting accidents in Power Systems using PMU signal | |
| KR100782354B1 (en) | System and method for determining areas of vulnerability for voltage sags assessment, and a medium having computer readable program for executing the method | |
| CN114977109A (en) | Method, device and equipment for identifying fault state of components in half-bridge power module | |
| CN107169213B (en) | Method, device and system for testing function indexes of zero-sequence current adaptive protection device | |
| CN116167200A (en) | Service life detection method and device for power distribution cabinet | |
| CN113848410B (en) | Detection method and device of control protection device | |
| CN112485720B (en) | Cable insulation defect detection method and device | |
| JP7437584B2 (en) | Machine learning-based method and apparatus for power line disturbance classification | |
| Mumtaz et al. | Incipient fault detection in active-distribution networks based on Time-varying Kalman Filter | |
| Shareef et al. | An alternative voltage sag source identification method utilizing radial basis function network | |
| CN114325107A (en) | Method for judging accuracy of harmonic impedance calculation result | |
| Toma et al. | Impact of measurement set-up on RVC-like event detection | |
| KR101327748B1 (en) | Power signal generation method for assessment of power quality classification | |
| CN113807635B (en) | Service operation data monitoring method and device, electronic equipment and storage medium | |
| CN116165468B (en) | Method and device for testing stable winding of transformer and electronic equipment | |
| CN116227977A (en) | Power grid power transmission capacity calculation method considering multiple fault risks in disaster scene |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |