CN113917261B - Differential protection parameter verification method and device for direct current protection equipment - Google Patents

Differential protection parameter verification method and device for direct current protection equipment Download PDF

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Publication number
CN113917261B
CN113917261B CN202111163581.7A CN202111163581A CN113917261B CN 113917261 B CN113917261 B CN 113917261B CN 202111163581 A CN202111163581 A CN 202111163581A CN 113917261 B CN113917261 B CN 113917261B
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current
value
protection
differential
direct current
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CN113917261A (en
Inventor
杨锐雄
丘冠新
陈建福
陈勇
刘尧
裴星宇
李建标
吴宏远
程旭
黄志新
林桂辉
郭华君
喻松涛
何智鹏
李巍巍
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Guangdong Power Grid Co Ltd
Zhuhai Power Supply Bureau of Guangdong Power Grid Co Ltd
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Guangdong Power Grid Co Ltd
Zhuhai Power Supply Bureau of Guangdong Power Grid Co Ltd
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Priority to CN202111163581.7A priority Critical patent/CN113917261B/en
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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
    • 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 direct-current distribution networks, and discloses a differential protection parameter verification method and device for direct-current protection equipment. The method and the device of the invention are used for testing by inputting two linearly-increased currents into the direct current control and protection equipment, so as to obtain the current value corresponding to the direct current control and protection equipment when outputting the difference flow out-of-limit alarm signal in each test, calculate the output delay and the difference flow definite value of the output difference flow out-of-limit alarm signal according to the obtained two current values, and check the output delay and the difference flow definite value by utilizing the set value. According to the invention, under the condition of fewer testing times, the existing direct current control protection detector is utilized to complete the test and verification of the differential protection function of the direct current control protection equipment, and the method 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 control protection equipment.

Description

Differential protection parameter verification method and device for direct current protection equipment
Technical Field
The invention relates to the technical field of operation control and protection of a direct-current power distribution network, 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 the direct current distribution network, and the direct current protection device is used for controlling to disconnect the power supply of the fault device/line when the difference value (differential current) of the current of the direct current protection device/line section is larger than a differential protection set value by comparing the inflow current and the outflow current of the protected device/line section, so that the differential protection function of the protected device/line section is realized.
In order to ensure the normal operation of the direct current control and protection equipment, the differential protection function of the direct current control and protection equipment needs to be comprehensively tested and checked. There are two test verification modes in the prior art:
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;
and secondly, judging whether the direct current protection equipment can act correctly under the input test waveform by adopting a correlation detector, wherein in the mode, if the number of fault simulation is small, the actual protection boundary of the direct current protection equipment is difficult to determine, and if the number of fault simulation is too large, the detection period is obviously increased.
Disclosure of Invention
The invention provides a differential protection parameter verification method and device for direct current protection equipment, which solve the technical problems of high detection cost and long period of the existing differential protection function test verification method for the direct current protection equipment.
An embodiment of a first aspect of the present invention provides a method for verifying differential protection parameters for a direct current protection device, where the differential protection parameters include an output delay set value T of an output differential current out-of-limit alarm signal of the direct current protection device s1 Sum and difference stream constant value set point I s1 The method comprises the following steps:
inputting a first linear increasing current into a direct current control and protection device, and obtaining a current value I corresponding to the direct current control and protection device when outputting a difference current out-of-limit alarm signal a1 ；
Inputting a second linear increasing current to the direct current control and protection equipment, and obtaining a current value I corresponding to the direct current control and protection equipment when the direct current control and protection equipment outputs a difference current out-of-limit alarm signal a2 ；
According to the current value I a1 And the current value I a2 Calculating the output delay T of the output difference flow out-of-limit alarm signal of the direct current control and protection equipment 1 Sum and difference stream constant value I c1 ；
Delaying the output by T 1 And the output delay set value T s1 Comparing and, determining the difference value I c1 And the difference flow constant value set value I s1 And comparing, and judging whether the differential flow out-of-limit alarming action of the direct current protection equipment is reliable or not according to a comparison result.
According to one implementation manner of the first aspect of the present invention, the inputting the first linear growth current to the direct current protection device includes:
Inputting a first path of current and a second path of current into the direct current control and protection equipment;
and 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 one possible implementation manner of the first aspect of the present invention, the initial current values of the first current path and the second current path are set to correspond to rated currents of the protected device.
According to one implementation manner of the first aspect of the present invention, the differential protection parameter further includes an output delay setting T of the dc control protection device outputting a low-value protection action signal s2 Sum and difference stream constant value set point I s2 The method further comprises:
when the first linear increasing current is input to the direct current control and protection equipment, a current value I corresponding to the direct current control and protection equipment when outputting a low-value protection action signal is obtained a1 ' and when a second linear increasing current is input to the direct current control and protection device, obtaining a current value I corresponding to the direct current control and protection device when outputting a low-value protection action signal a2 ′；
According to the current value I a1 ' sum said current value I a2 ' calculating the output delay T of the low-value protection action signal output by the direct-current control protection equipment 2 Sum and difference stream constant value I c2 ；
Delaying the output by T 2 And the output delay set value T s2 Comparing and, determining the difference value I c2 And the difference flow constant value set value I s2 And comparing, and judging whether the low-value protection action of the direct current protection equipment is reliable or not according to a comparison result.
According to one implementation manner of the first aspect of the present invention, the differential protection parameter further includes an output delay setting T of the dc control protection device outputting a high-value protection action signal s3 Sum and difference stream constant value set point I s3 The method further comprises:
inputting a first rapid increase current into the direct current control and protection equipment, and obtaining a current value I corresponding to the direct current control and protection equipment when outputting a high-value protection action signal a3 ；
To the direct current control and protectionThe equipment inputs a second rapid increase current to obtain a current value I corresponding to the process that the direct current control protection equipment outputs a high-value protection action signal a4 ；
According to the current value I a3 And the current value I a4 Calculating the output delay T of the direct current control protection device for outputting a high-value protection action signal 3 Sum and difference stream constant value I c3 ；
Delaying the output by T 3 And the output delay set value T s3 Comparing and, determining the difference value I c3 And the difference flow constant value set value I s3 And comparing, and judging whether the high-value protection action of the direct current protection equipment is reliable or not according to a comparison result.
According to one manner of realisable of the first aspect of the invention, the current increase rate of the first rapidly increasing current satisfies:
in the formula ,k3 A current increase rate representative of the first rapidly increasing current;
the current increase rate of the second rapidly increasing current satisfies:
in the formula ,k4 Representing the current increase rate of the second rapidly increasing current.
According to one implementation manner of the first aspect of the present invention, the differential protection parameter further includes a differential protection slope setting value, and the method further includes:
inputting two paths of currents to the direct-current control and protection equipment, wherein the initial values of the two paths of currents are set to be rated currents corresponding to the protected equipment;
the direct current control protection equipment is tested for three times, and the current value of one current is regulated to be a first current setting in the first testThe value is used for obtaining a corresponding differential current test value I dz And a brake current test value I zd Wherein the first current set point is smaller than the differential current set point I c1 The method comprises the steps of carrying out a first treatment on the surface of the During the second test, the current value of one current is adjusted to be a second current set value so as to obtain a corresponding differential current test value I dz And a brake current test value I zd2 The second current set value is smaller than the difference current set value I c2 And is greater than the differential flow constant value I c1 The method comprises the steps of carrying out a first treatment on the surface of the In the third test, the current value of one current is regulated to be a third current set value so as to obtain a corresponding differential current test value I dz3 And a brake current test value I zd The third current set value is smaller than the difference current set value I c3 And is greater than the differential flow constant value I c2 ；
According to the differential current test value I dz1 Brake current test value I zd Differential current test value I dz2 Brake current test value I zd Differential current test value I dz3 And a brake current test value I zd3 Calculating the differential protection slope of the direct current control protection equipment;
and comparing the differential protection slope with the differential protection slope set value, and outputting a corresponding comparison result.
According to one possible implementation manner of the first aspect of the present invention, the differential protection slope of the dc control protection device is calculated according to the following formula:
wherein
in the formula ,kd Representing the differential protection slope of the dc controlled protection arrangement.
The second aspect of the present invention provides a differential protection parameter checking device for a direct current protection device, which is characterized in that the differential protection parameter includes an output delay set value T of the direct current protection device for outputting a differential current out-of-limit alarm signal s1 Sum and difference stream constant value set point I s1 The apparatus comprises:
a first test module for inputting a first linear increase current to the DC control and protection device and obtaining a current value I corresponding to the output of the difference current out-of-limit alarm signal by the DC control and protection device a1 ；
A second test module, configured to input a second linearly increasing current to the dc control protection device, and obtain a current value I corresponding to when the dc control protection device outputs a differential current out-of-limit alarm signal a2 ；
A first calculation module for calculating a current value according to the current value I a1 And the current value I a2 Calculating the output delay T of the output difference flow out-of-limit alarm signal of the direct current control and protection equipment 1 Sum and difference stream constant value I c1 ；
A first differential protection function analysis module for delaying the output by T 1 And the output delay set value T s1 Comparing and, determining the difference value I c1 And the difference flow constant value set value I s1 And comparing, and judging whether the differential flow out-of-limit alarming action of the direct current protection equipment is reliable or not according to a comparison result.
According to one manner of implementation of the second aspect of the present invention, the first test module includes:
the current input unit is used for inputting a first path of current and a second path of current to the direct current control and protection equipment;
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 one possible implementation manner of the second aspect of the present invention, the initial current values of the first current path and the second current path are set to correspond to rated currents of the protected device.
According to one implementation manner of the second aspect of the present invention, the differential protection parameter further includes an output delay setting T of the dc control protection device outputting a low-value protection action signal s2 Sum and difference stream constant value set point I s2 The apparatus further comprises:
a third test module, configured to obtain a current value I corresponding to when the dc control protection device outputs a low-value protection action signal when the first linear increase current is input to the dc control protection device a1 ′；
A fourth test module, configured to obtain a current value I corresponding to the dc control protection device when the dc control protection device outputs a low-value protection action signal when a second linearly increasing current is input to the dc control protection device a2 ′；
A second calculation module for calculating a current value according to the current value I a1 ' sum said current value I a2 ' calculating the output delay T of the low-value protection action signal output by the direct-current control protection equipment 2 Sum and difference stream constant value I c2 ；
A second differential protection function analysis module for delaying the output by T 2 And the output delay set value T s2 Comparing and, determining the difference value I c2 And the difference flow constant value set value I s2 And comparing, and judging whether the low-value protection action of the direct current protection equipment is reliable or not according to a comparison result.
According to one implementation manner of the second aspect of the present invention, the differential protection parameter further includes an output delay setting T of the dc control protection device outputting a high-value protection action signal s3 Sum and difference stream constant value set point I s3 The apparatus further comprises:
a fifth test module, configured to input a first fast-growing current to the dc control protection device, and obtain a current value I corresponding to when the dc control protection device outputs a high-value protection action signal a3 ；
A sixth test module, configured to input a second rapidly increasing current to the dc control protection device, and obtain a current value I corresponding to when the dc control protection device outputs a high-value protection action signal a4 ；
A third calculation module for calculating a current value according to the current value I a3 And the current value I a4 Calculating the output delay T of the direct current control protection device for outputting a high-value protection action signal 3 Sum and difference stream constant value I c3 ；
A third differential protection function analysis module for delaying the output by T 3 And the output delay set value T s3 Comparing and, determining the difference value I c3 And the difference flow constant value set value I s3 And comparing, and judging whether the high-value protection action of the direct current protection equipment is reliable or not according to a comparison result.
According to one manner of realising the second aspect of the invention, the current increase rate of the first rapidly increasing current satisfies:
in the formula ,k3 A current increase rate representative of the first rapidly increasing current;
the current increase rate of the second rapidly increasing current satisfies:
in the formula ,k4 Representing the current increase rate of the second rapidly increasing current.
According to one manner of implementation of the second aspect of the present invention, the differential protection parameter further includes a differential protection slope setting value, and the apparatus further includes:
the current input module is used for inputting two paths of currents to the direct current control protection equipment, and the initial values of the two paths of currents are set to be rated currents corresponding to the protected equipment;
a seventh test module, configured to perform three tests on the dc control protection device, and adjust a current value of one of the currents to a first current set value during the first test to obtain a corresponding differential current test value I dz1 And a brake current test value I zd1 Wherein the first current set point is smaller than the differential current set point I c1 The method comprises the steps of carrying out a first treatment on the surface of the During the second test, the current value of one current is adjusted to be a second current set value so as to obtain a corresponding differential current test value I dz And a brake current test value I zd2 The second current set value is smaller than the difference current set value I c2 And is greater than the differential flow constant value I c1 The method comprises the steps of carrying out a first treatment on the surface of the In the third test, the current value of one current is regulated to be a third current set value so as to obtain a corresponding differential current test value I dz3 And a brake current test value I zd The third current set value is smaller than the difference current set value I c3 And is greater than the differential flow constant value I c2 ；
A fourth calculation module for calculating a differential current test value I according to the differential current test value dz Brake current test value I zd Differential current test value I dz2 Brake current test value I zd Differential current test value I dz3 And a brake current test value I zd3 Calculating the differential protection slope of the direct current control 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 one possible manner of the second aspect of the present invention, the differential protection slope of the dc control protection arrangement is calculated according to the following formula:
wherein
in the formula ,kd Representing the differential protection slope of the dc controlled protection arrangement.
The third aspect of the present invention provides a differential protection parameter checking device for direct current protection equipment, comprising:
a memory for storing instructions; the instructions are instructions capable of realizing the steps of the differential protection parameter verification method for the direct current protection equipment in any mode;
and the processor is used for executing the instructions in the memory.
A fourth aspect of the present invention provides a computer readable storage medium, on which a computer program is stored, the computer program implementing the steps of the differential protection parameter verification method for a direct current protection device according to any one of the above modes when executed by a processor.
From the above technical scheme, the invention has the following advantages:
the invention inputs two linear increasing currents to the direct current control and protection equipment for testing so as to obtain the current value corresponding to the direct current control and protection equipment outputting the difference flow out-of-limit alarm signal in each test, calculates the output delay and the difference flow fixed value of the output difference flow out-of-limit alarm signal according to the obtained two current values, and checks the output delay and the difference flow fixed value by utilizing the set value, thereby realizing the test and check of the differential protection function of the direct current control and protection equipment; according to the invention, under the condition of fewer testing times, the existing direct current control protection detector is utilized to complete the test and verification of the differential protection function of the direct current control protection equipment, and the method 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 control protection equipment.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic diagram of the differential protection principle of a dc control protecting device according to an alternative embodiment of the present invention;
fig. 2 is a flowchart of a method for verifying differential protection parameters of a direct current protection device according to an alternative embodiment of the present invention;
fig. 3 is a schematic structural connection diagram of a differential protection parameter checking device for a direct current 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 computing module; 4-a first differential protection function analysis module.
Detailed Description
The embodiment of the invention provides a differential protection parameter verification method and device for direct current protection equipment, which are used for solving the technical problems of high detection cost and long period of the conventional differential protection function test verification method for the direct current protection equipment.
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, in the embodiments of the present invention, there is a description of "first", "second", etc., and the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
It should be noted that, the method and apparatus of the following embodiments of the present invention are specifically directed to parameter verification of two-stage ratio brake differential protection, the corresponding differential protection principle is shown in fig. 1, where I dz Representing differential current, I zd Indicating braking current, I cd Representing the differential protection start-up current. The direct current protection device outputs a protection operation signal when the following condition is satisfied (i.e., in an operation region as shown in fig. 1), and does not output a protection operation signal when the following condition is not satisfied (i.e., in a braking region as shown in fig. 1):
in the formula ,kd Representing the differential protection slope of a DC protection device, where I dz ＝|I a -I b |,I zd ＝|I a +I b |，I a I for the inflow current of the protected device/line section b Is the outgoing current of the protected equipment/line section.
The direct current control and protection equipment facing the method and the device provided by the invention has the following three-section delay outlet functions:
when the differential current is greater than the differential current constant value set value I s1 When the direct current control protection device outputs a difference flow out-of-limit alarm signal, the output delay is T s1 Wherein the difference flow is set at a value of s1 Outputting a set value of a difference flow out-of-limit alarm signal for the direct current control and protection equipment, I s1 ＝I cd ；
When the differential current is greater than the differential current constant value set value I s2 When the direct current control protection device outputs a low-value protection action signal, the output delay is T s2 Wherein the difference flow is set at a value of set I s2 Setting a value for the low difference stream;
when the differential current is greater than the differential current constant value set value I s3 When the direct current control protection device outputs a high-value protection action signal, the output delay is T s3 Wherein the difference flow is set at a value of set I s3 The value is determined for the altitude difference.
Referring to fig. 2, fig. 2 is a flowchart of a differential protection parameter verification method for a direct current protection device according to an embodiment of the present invention.
Wherein the differential protection parameters comprise an output delay set value T of the output differential flow out-of-limit alarm signal of the direct current control protection equipment s1 Sum and difference stream constant value set point I s1 The method comprises the following steps:
s1, inputting a first linear increasing current into direct current control and protection equipment, and obtaining a current value I corresponding to the direct current control and protection equipment when outputting a difference current out-of-limit alarm signal a1 。
In one implementation, the inputting the first linear increase current to the dc control and protection device includes:
inputting a first path of current and a second path of current into the direct current control and protection equipment;
and 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 current and the second current are independent currents respectively, the first current and the second current can be input into the direct current control and protection equipment through the existing direct current control and protection detector, and initial values of the two currents can be set to be rated currents corresponding to the protected equipment or the protected line section.
In one embodiment, the current value of the first current is linearly increased with time by using a smaller slope k 1 The current value linearly increases along with time, and the initial current value of the first current is set as I N The increased current value is I a Then I a ＝I N +k 1 t, t represents time.
S2, inputting a second linear increasing current to the direct current control and protection equipment, and obtaining a current value I corresponding to the direct current control and protection equipment when outputting a difference current out-of-limit alarm signal a2 。
When needed, the second linearly increasing current is input by referring to the above-mentioned manner of inputting the first linearly increasing current. Wherein a smaller slope k may be employed 2 The current value linearly increases along with time, and the initial current value of the second path of current is set as I N The increased current value is I b Then I b ＝I N +k 2 t。
The method for inputting the linear increasing current is simple and quick, and the detection period can be effectively shortened.
S3 according to the current value I a1 And the current value I a2 Calculating the output delay T of the output difference flow out-of-limit alarm signal of the direct current control and protection equipment 1 Sum and difference stream constant value I c1 。
In one manner that can be implemented, the output delay T 1 The calculation formula of (2) is as follows:
in one manner that can be implemented, the difference flow is definedValue I c1 The calculation formula of (2) is as follows:
I c1 ＝I a1 -k 1 ×T 1 。
S4, delaying the output by T 1 And the output delay set value T s1 Comparing and, determining the difference value I c1 And the difference flow constant value set value I s1 And comparing, and judging whether the differential flow out-of-limit alarming action of the direct current protection equipment is reliable or not according to a comparison result.
The embodiment of the invention can intelligently realize the verification of the related differential protection parameters, thereby greatly saving manpower.
Wherein, the set value of the relevant differential protection parameter of the direct current protection device can be obtained by a mode of being read by a relevant detector.
In an embodiment, when determining whether the differential flow out-of-limit alarm action of the direct current protection device is reliable according to the comparison result, a corresponding first difference threshold and a second difference threshold may be set, if the output delay T 1 And the output delay set value T s1 Exceeds the first difference threshold, or the difference stream is a constant I c1 And the difference flow constant value set value I s1 If the difference value of the detected direct current control and protection equipment exceeds the second difference value threshold value, judging that the detected differential current out-of-limit alarming action of the direct current control and protection equipment is not a reliable action, namely, the detected differential protection function of the direct current control and protection equipment fails, otherwise, judging that the differential protection function of the direct current control and protection equipment is good.
It should be noted that, the corresponding calibration rule may also be determined according to the actual situation, so as to analyze the test value and the set value of the differential protection parameter.
According to the embodiment of the invention, the direct current control and protection equipment inputs two times of linearly-increased current for testing, so that the current value corresponding to the direct current control and protection equipment outputting the difference flow out-of-limit alarm signal in each test is obtained, the output delay and the difference flow fixed value of the output difference flow out-of-limit alarm signal are calculated according to the obtained two times of current values, and the output delay and the difference flow fixed value are checked by utilizing the set value, so that the test and verification of the differential protection function of the direct current control and protection equipment is realized; according to the invention, under the condition of fewer testing times, the existing direct current control protection detector is utilized to complete the test and verification of the differential protection function of the direct current control protection equipment, and the method 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 control protection equipment.
In one implementation manner, the differential protection parameter further includes an output delay setting value T of the dc control protection device outputting a low-value protection action signal s2 Sum and difference stream constant value set point I s2 The method further comprises:
When the first linear increasing current is input to the direct current control and protection equipment, a current value I corresponding to the direct current control and protection equipment when outputting a low-value protection action signal is obtained a1 ' and when a second linear increasing current is input to the direct current control and protection device, obtaining a current value I corresponding to the direct current control and protection device when outputting a low-value protection action signal a2 ′；
According to the current value I a1 ' sum said current value I a2 ' calculating the output delay T of the low-value protection action signal output by the direct-current control protection equipment 2 Sum and difference stream constant value I c2 ；
Delaying the output by T 2 And the output delay set value T s2 Comparing and, determining the difference value I c2 And the difference flow constant value set value I s2 And comparing, and judging whether the low-value protection action of the direct current protection equipment is reliable or not according to a comparison result.
The embodiment of the invention simultaneously tests whether the low-value protection action is reliable or not when testing whether the differential flow out-of-limit alarm action is reliable or not, and the obtained current value I is used for testing whether the low-value protection action is reliable or not a1 ' Current value I a2 ' calculating the output delay T of the DC protection device to output the low value protection action signal 2 Sum and difference stream constant value I c2 The number of times of inputting the linearly increasing current can be omitted, so that the number of times of testing is saved, and the testing period is shortened.
Specifically, the output delay T 2 Calculated according to the following formula:
specifically, the difference stream defines the value I c2 The calculation formula of (2) is as follows:
I c2 ＝I a1 ′-k 1 ×T 2 。
in one implementation manner, the differential protection parameter further includes an output delay setting value T of the dc control protection device outputting a high-value protection action signal s3 Sum and difference stream constant value set point I s3 The method further comprises:
inputting a first rapid increase current into the direct current control and protection equipment, and obtaining a current value I corresponding to the direct current control and protection equipment when outputting a high-value protection action signal a3 ；
Inputting a second rapid increase current into the direct current control and protection equipment, and obtaining a current value I corresponding to the direct current control and protection equipment when outputting a high-value protection action signal a4 ；
According to the current value I a3 And the current value I a4 Calculating the output delay T of the direct current control protection device for outputting a high-value protection action signal 3 Sum and difference stream constant value I c3 ；
Delaying the output by T 3 And the output delay set value T s3 Comparing and, determining the difference value I c3 And the difference flow constant value set value I s3 And comparing, and judging whether the high-value protection action of the direct current protection equipment is reliable or not according to a 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, the calculation is performed by adopting fault difference current simulation which rises quickly, the calculation principle is the same as that in the step S3, but the current increasing rate of the two tests needs to be sufficiently large, so that the difference current reaches the high-value protection stage quickly, and the influence of low-value protection action signals is avoided. Therefore, the current increase rate of the first rapidly increasing current needs to satisfy the following condition:
in the formula ,k3 A 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 ,k4 Representing the current increase rate of the second rapidly increasing current.
In one implementation, the differential protection parameter further includes a differential protection slope setting, the method further comprising:
inputting two paths of currents to the direct-current control and protection equipment, wherein the initial values of the two paths of currents are set to be rated currents corresponding to the protected equipment;
the direct current control protection equipment is tested for three times, and the current value of one current is adjusted to be a first current set value in the first test to obtain a corresponding differential current test value I dz1 And a brake current test value I zd Wherein the first current set point is smaller than the differential current set point I c1 The method comprises the steps of carrying out a first treatment on the surface of the During the second test, the current value of one current is adjusted to be a second current set value so as to obtain a corresponding differential current test value I dz2 And a brake current test value I zd2 The second current set value is smaller than the difference current set value I c2 And is greater than the differential flow constant value I c1 The method comprises the steps of carrying out a first treatment on the surface of the In the third test, the current value of one current is regulated to be a third current set value so as to obtain a corresponding differential current test value I dz And a brake current test value I zd3 The third current set value is smaller than the difference current set value I c3 And is greater than the differential flow constant value I c2 ；
According to the differential current testValue I dz1 Brake current test value I zd1 Differential current test value I dz2 Brake current test value I zd Differential current test value I dz3 And a brake current test value I zd3 Calculating the differential protection slope of the direct current control protection equipment;
and comparing the differential protection slope with the differential protection slope set value, and outputting a corresponding comparison result.
The two-way current input method may refer to the input methods of the step S1 and the step S2. In the specific implementation, the direct current protection detector outputs two paths of independent currents to the direct current protection device, and initial values of the two paths of currents are selected as rated currents of the protected device or the line section. The first current set value enables the protection output of the direct current control protection device to be located in the range of the differential current out-of-limit alarming stage, the second current set value enables the protection output of the direct current control protection device to be located in the range of the low-value protection stage, and the third current set value enables the protection output of the direct current control protection device to be located in the range of the high-value protection stage.
The embodiment of the invention can obtain the first measuring point data (I) through the three tests dz1 ,I zd ) Second measurement point data (I) dz2 ,I zd2 ) And third station data (I dz3 ,I zd3 ) Further, the differential protection slope can be calculated according to the three measuring point data.
In one possible way, the differential protection slope is calculated by the least square method, and the differential protection slope of the dc control protection device is calculated according to the following formula:
wherein
in the formula ,kd Representing the differential protection slope of the dc controlled protection arrangement.
By the method for verifying the differential protection parameters, the delay and fixed value data of the differential protection of the direct current protection equipment can be analyzed and evaluated by the test means, the delay and fixed value data and the set value read by the detector by the communication means are mutually verified, the consistency of the set value and the actual function is checked, and the smooth development of the detection operation and maintenance work is ensured.
Referring to fig. 3, fig. 3 is a schematic structural connection diagram of a differential protection parameter checking device for a direct current protection device according to an alternative embodiment of the present invention.
Wherein the differential protection parameters comprise an output delay set value T of the output differential flow out-of-limit alarm signal of the direct current control protection equipment s1 Sum and difference stream constant value set point I s1 The apparatus comprises:
a first test module 1, configured to input a first linear increase current to a dc control protection device, and obtain a current value I corresponding to when the dc control protection device outputs a differential current out-of-limit alarm signal a1 ；
A second test module 2, configured to input a second linearly increasing current to the dc control protection device, and obtain a current value I corresponding to when the dc control protection device outputs a differential current out-of-limit alarm signal a2 ；
A first calculation module 3 for calculating a current value I according to the current value I a1 And the current value I a2 Calculating the output delay T of the output difference flow out-of-limit alarm signal of the direct current control and protection equipment 1 Sum and difference stream constant value I c1 ；
A first differential protection function analysis module 4 for delaying the output by T 1 And the output delay set value T s1 Comparing and, determining the difference value I c1 And the difference flow constant value set value I s1 And comparing, and judging whether the differential flow out-of-limit alarming action of the direct current protection equipment is reliable or not according to a comparison result.
In one possible implementation, the first test module 1 includes:
the current input unit is used for inputting a first path of current and a second path of current to the direct current control and protection equipment;
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 one possible implementation, the initial current values of the first current and the second current are set to correspond to rated currents of the protected device.
In one implementation manner, the differential protection parameter further includes an output delay setting value T of the dc control protection device outputting a low-value protection action signal s2 Sum and difference stream constant value set point I s2 The apparatus further comprises:
a third test module, configured to obtain a current value I corresponding to when the dc control protection device outputs a low-value protection action signal when the first linear increase current is input to the dc control protection device a1 ′；
A fourth test module, configured to obtain a current value I corresponding to the dc control protection device when the dc control protection device outputs a low-value protection action signal when a second linearly increasing current is input to the dc control protection device a2 ′；
A second calculation module for calculating a current value according to the current value I a1 ' sum said current value I a2 ' calculating the output delay T of the low-value protection action signal output by the direct-current control protection equipment 2 Sum and difference stream constant value I c2 ；
A second differential protection function analysis module for delaying the output by T 2 And the output delay set value T s2 Comparing and, determining the difference value I c2 And the difference flow constant value set value I s2 And comparing, and judging whether the low-value protection action of the direct current protection equipment is reliable or not according to a comparison result.
In one implementation manner, the differential protection parameter further includes an output delay setting value T of the dc control protection device outputting a high-value protection action signal s3 Sum and difference stream constant value set point I s3 The apparatus further comprises:
a fifth test module, configured to input a first fast-growing current to the dc control protection device, and obtain a current value I corresponding to when the dc control protection device outputs a high-value protection action signal a3 ；
A sixth test module, configured to input a second rapidly increasing current to the dc control protection device, and obtain a current value I corresponding to when the dc control protection device outputs a high-value protection action signal a4 ；
A third calculation module for calculating a current value according to the current value I a3 And the current value I a4 Calculating the output delay T of the direct current control protection device for outputting a high-value protection action signal 3 Sum and difference stream constant value I c3 ；
A third differential protection function analysis module for delaying the output by T 3 And the output delay set value T s3 Comparing and, determining the difference value I c3 And the difference flow constant value set value I s3 And comparing, and judging whether the high-value protection action of the direct current protection equipment is reliable or not according to a comparison result.
In one manner that can be achieved, the current increase rate of the first rapidly increasing current satisfies:
in the formula ,k3 A current increase rate representative of the first rapidly increasing current;
the current increase rate of the second rapidly increasing current satisfies:
in the formula ,k4 Representing the current increase rate of the second rapidly increasing current.
In one implementation, the differential protection parameter further includes a differential protection slope set point, and the apparatus further includes:
the current input module is used for inputting two paths of currents to the direct current control protection equipment, and the initial values of the two paths of currents are set to be rated currents corresponding to the protected equipment;
a seventh test module, configured to perform three tests on the dc control protection device, and adjust a current value of one of the currents to a first current set value during the first test to obtain a corresponding differential current test value I dz1 And a brake current test value I zd1 Wherein the first current set point is smaller than the differential current set point I c1 The method comprises the steps of carrying out a first treatment on the surface of the During the second test, the current value of one current is adjusted to be a second current set value so as to obtain a corresponding differential current test value I dz2 And a brake current test value I zd2 The second current set value is smaller than the difference current set value I c2 And is greater than the differential flow constant value I c1 The method comprises the steps of carrying out a first treatment on the surface of the In the third test, the current value of one current is regulated to be a third current set value so as to obtain a corresponding differential current test value I dz And a brake current test value I zd3 The third current set value is smaller than the difference current set value I c3 And is greater than the differential flow constant value I c2 ；
A fourth calculation module for calculating a differential current test value I according to the differential current test value dz1 Brake current test value I zd1 Differential current test value I dz2 Brake current test value I zd2 Differential current test value I dz3 And a brake current test value I zd3 Calculating the differential protection slope of the direct current control 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 possible implementation, the differential protection slope of the dc-controlled protection arrangement is calculated according to the following formula:
wherein
/>
in the formula ,kd Representing the differential protection slope of the dc controlled protection arrangement.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working processes and corresponding effects of the above-described devices, modules and units may refer to corresponding processes and corresponding effects in the foregoing method embodiments, which are not described herein again.
The invention also provides a differential protection parameter checking device for direct current protection equipment, which is characterized by comprising the following components:
a memory for storing instructions; the instructions are instructions capable of implementing the steps of the differential protection parameter verification method for direct current protection equipment according to any one of the embodiments;
And the processor is used for executing the instructions in the memory.
The invention also provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program realizes the steps of the differential protection parameter verification method for direct current protection equipment according to any one embodiment when being executed by a processor.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown 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 may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform 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, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (18)

1. A differential protection parameter verification method for direct current protection equipment is characterized in that the differential protection parameter comprises an output delay set value of an output differential current out-of-limit alarm signal of the direct current protection equipmentSum and difference stream constant value set pointThe method comprises the following steps:
inputting a first linear increasing current into the direct current control and protection equipment, and obtaining a current value corresponding to the direct current control and protection equipment when outputting a difference current out-of-limit alarm signal；
To the direct current control and protectionThe equipment inputs a second linear increasing current to obtain a current value corresponding to the direct current control equipment when outputting a difference flow out-of-limit alarm signal；
According to the current valueAnd the current value +. >Calculating the output delay of the output difference flow out-of-limit alarm signal of the direct current control and protection equipment>Sum and difference stream constant->The method comprises the steps of carrying out a first treatment on the surface of the Wherein the output delay +.>And the difference flow constant +.>The calculation formula of (2) is as follows:
；
；
wherein ,a linear increase slope representing a first linear increase current, < >>Linearity representing a second linearly increasing currentAn increase slope;
delaying the outputAnd the output delay setting value +.>Comparing and setting the difference value +.>Setting value +.>And comparing, and judging whether the differential flow out-of-limit alarming action of the direct current protection equipment is reliable or not according to a comparison result.
2. The method for verifying the differential protection parameters of the direct current protection device according to claim 1, wherein the step of inputting the first linear increase current to the direct current protection device comprises:
inputting a first path of current and a second path of current into the direct current control and protection equipment;
and 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 method for verifying the differential protection parameters for the direct current protection device according to claim 2, wherein the initial current values of the first current and the second current are set to be rated currents corresponding to the protected device.
4. The method for verifying differential protection parameters of direct current protection equipment according to claim 1, wherein the differential protection parameters further comprise an output delay set value of the low-value protection action signal output by the direct current protection equipmentSum and difference stream constant value set value->The method further comprises:
when the first linear increasing current is input to the direct current control and protection equipment, a current value corresponding to the direct current control and protection equipment when outputting a low-value protection action signal is obtainedWhen a second linear increasing current is input to the direct current control and protection device, a current value corresponding to the direct current control and protection device when outputting a low-value protection action signal is acquired>；
According to the current valueAnd the current value +.>Calculating the output delay of the direct current control protection device for outputting a low-value protection action signal>Sum and difference stream constant->；
Delaying the outputAnd the output delay setting value +.>Comparing and setting the difference value +.>And said at least one ofDifferential flow set value +.>And comparing, and judging whether the low-value protection action of the direct current protection equipment is reliable or not according to a comparison result.
5. The method for verifying a differential protection parameter for a direct current protection device according to claim 4, wherein the differential protection parameter further comprises an output delay set value for the direct current protection device to output a high-value protection action signal Sum and difference stream constant value set value->The method further comprises:
inputting a first rapid increase current into the direct current control and protection equipment to obtain a current value corresponding to the direct current control and protection equipment when outputting a high-value protection action signal；
Inputting a second rapid increase current to the direct current control and protection equipment to obtain a current value corresponding to the direct current control and protection equipment when outputting a high-value protection action signal；
According to the current valueAnd the current value +.>Calculating the output delay of the direct current control protection device for outputting a high-value protection action signal>Sum and difference stream constant->；
Delaying the outputAnd the output delay setting value +.>Comparing and setting the difference value +.>Setting value +.>And comparing, and judging whether the high-value protection action of the direct current protection equipment is reliable or not according to a comparison result.
6. The method for verifying a differential protection parameter for a direct current protection device according to claim 5, wherein a current increase rate of the first rapidly increasing current satisfies:
；
in the formula ,a current increase rate representative of the first rapidly increasing current;
the current increase rate of the second rapidly increasing current satisfies:
；
in the formula ,representing the current increase rate of the second rapidly increasing current.
7. The method for verifying a differential protection parameter of a direct current protection device according to claim 5, wherein the differential protection parameter further comprises a differential protection slope set point, the method further comprising:
inputting two paths of currents to the direct-current control and protection equipment, wherein the initial values of the two paths of currents are set to be rated currents corresponding to the protected equipment;
the direct current control protection equipment is tested for three times, and the current value of one current is adjusted to be a first current set value in the first test to obtain a corresponding differential current test valueAnd brake current test value +.>Wherein said first current set value is smaller than said difference set value +.>The method comprises the steps of carrying out a first treatment on the surface of the In the second test, the current value of one current is regulated to be a second current set value so as to obtain a corresponding differential current test value +.>And brake current test value +.>The second current set value is smaller than the difference set value +.>And greater than said difference flow constant +.>The method comprises the steps of carrying out a first treatment on the surface of the In the third test, the current value of one current is regulated to be a third current set valueTo obtain the corresponding differential current test value +.>And brake current test value +.>The third current set value is smaller than the difference set value +. >And greater than said difference flow constant +.>；
According to the differential current test valueBrake current test value->Differential current test value->Brake current test value->Differential current test value->And brake current test value +.>Calculating the differential protection slope of the direct current control protection equipment;
and comparing the differential protection slope with the differential protection slope set value, and outputting a corresponding comparison result.
8. The method for verifying the differential protection parameters of the direct current protection device 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 ,representing the differential protection slope of the dc controlled protection arrangement.
9. A differential protection parameter checking device for direct current protection equipment is characterized in that the differential protection parameter comprises an output delay set value of an output differential current out-of-limit alarm signal of the direct current protection equipmentSum and difference stream constant value set pointThe apparatus comprises:
a first test module for inputting a first linear increase current to the DC control and protection device and obtaining a current value corresponding to the output of the difference current out-of-limit alarm signal by the DC control and protection device；
A second test module, configured to input a second linearly increasing current to the dc control protection device, and obtain a current value corresponding to when the dc control protection device outputs a difference current out-of-limit alarm signal ；
A first calculation module for calculating a current value according to the current valueAnd the current value +.>Calculating the output delay of the output difference flow out-of-limit alarm signal of the direct current control and protection equipment>Sum and difference stream constant->The method comprises the steps of carrying out a first treatment on the surface of the Wherein the output delay +.>And the difference stream constantThe calculation formula of (2) is as follows:
；
；
wherein ,a linear increase slope representing a first linear increase current, < >>A linear increase slope representing a second linear increase current;
a first differential protection function analysis module for delaying the outputAnd the output delay setting value +.>Comparing and setting the difference value +.>Setting value +.>And comparing, and judging whether the differential flow out-of-limit alarming action of the direct current protection equipment is reliable or not according to a comparison result.
10. The differential protection parameter checking apparatus for direct current protection equipment 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 control and protection equipment;
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 checking apparatus for direct current protection equipment according to claim 10, wherein the initial current values of the first current and the second current are set to be rated currents corresponding to the protected equipment.
12. According to claim 9The differential protection parameter checking device facing the direct current protection equipment is characterized in that the differential protection parameter also comprises an output delay set value for the direct current protection equipment to output a low-value protection action signalSum and difference stream constant value set value->The apparatus further comprises:
a third test module, configured to obtain a current value corresponding to when the dc control protection device outputs a low-value protection action signal when the first linear increase current is input to the dc control protection device；
A fourth test module, configured to obtain a current value corresponding to when the dc control protection device outputs a low-value protection action signal when the second linearly increasing current is input to the dc control protection device；
A second calculation module for calculating a current value according to the current valueAnd the current value +.>Calculating the output delay of the direct current control protection device for outputting a low-value protection action signal>Sum and difference stream constant->；
A second differential protection function analysis module for delaying the output And the output delay setting value +.>Comparing and setting the difference value +.>Setting value +.>And comparing, and judging whether the low-value protection action of the direct current protection equipment is reliable or not according to a comparison result.
13. The differential protection parameter checking apparatus for a dc-link protection device according to claim 12, wherein the differential protection parameter further comprises an output delay setting value for the dc-link protection device to output a high-value protection action signalSum and difference stream constant value set value->The apparatus further comprises:
a fifth test module, configured to input a first fast-growing current to the dc control protection device, and obtain a current value corresponding to when the dc control protection device outputs a high-value protection action signal；
A sixth test module, configured to input a second rapidly increasing current to the dc control protection device, and obtain a current value corresponding to when the dc control protection device outputs a high-value protection action signal；
A third calculation module for calculating a current value according to the current valueAnd the current value +.>Calculating the output delay of the direct current control protection device for outputting a high-value protection action signal>Sum and difference stream constant->；
A third differential protection function analysis module for delaying the output And the output delay setting value +.>Comparing and setting the difference value +.>Setting value +.>And comparing, and judging whether the high-value protection action of the direct current protection equipment is reliable or not according to a comparison result.
14. The direct current protection device-oriented differential protection parameter verification apparatus of claim 13, wherein the current increase rate of the first rapidly increasing current satisfies:
；
in the formula ,a current increase rate representative of the first rapidly increasing current;
the current increase rate of the second rapidly increasing current satisfies:
；
in the formula ,representing the current increase rate of the second rapidly increasing current.
15. The differential protection parameter checking apparatus for a direct current protection device according to claim 13, wherein the differential protection parameter further comprises a differential protection slope setting value, the apparatus further comprising:
the current input module is used for inputting two paths of currents to the direct current control protection equipment, and the initial values of the two paths of currents are set to be rated currents corresponding to the protected equipment;
a seventh test module, configured to perform three tests on the dc control protection device, and adjust a current value of one of the currents to a first current set value during the first test to obtain a corresponding differential current test value And a brake current test valueWherein said first current set value is smaller than said difference set value +.>The method comprises the steps of carrying out a first treatment on the surface of the In the second test, the current value of one current is regulated to be a second current set value so as to obtain a corresponding differential current test value +.>And brake current test value +.>The second current set value is smaller than the difference set value +.>And greater than said difference flow constant +.>The method comprises the steps of carrying out a first treatment on the surface of the In the third test, the current value of one current is regulated to be a third current set value so as to obtain a corresponding differential current test value +.>And brake current test value +.>The third current set value is smaller than the difference set value +.>And greater than said difference flow constant +.>；
A fourth calculation module for measuring the differential current according to the differential currentBrake current test value->Differential current test value->Brake current test value->Differential current test value->And brake current test value +.>Calculating the differential protection slope of the direct current control 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 checking apparatus for a dc-controlled protection arrangement according to claim 15, wherein the differential protection slope of the dc-controlled protection arrangement is calculated according to the following formula:
；
wherein
；
；
；
；
in the formula ,representing the differential protection slope of the dc controlled protection arrangement.
17. The utility model provides a differential protection parameter verifying attachment towards direct current protection equipment which characterized in that includes:
a memory for storing instructions; wherein the instruction is an instruction capable of implementing the steps of the differential protection parameter checking method for direct current protection equipment according to any one of claims 1 to 8;
and the processor is used for executing 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 direct current protection device oriented differential protection parameter verification method according to any one of claims 1-8.
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