CN113283068B - Method for improving alternating current sampling precision and reliability of relay protection device - Google Patents
Method for improving alternating current sampling precision and reliability of relay protection device Download PDFInfo
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- CN113283068B CN113283068B CN202110542503.1A CN202110542503A CN113283068B CN 113283068 B CN113283068 B CN 113283068B CN 202110542503 A CN202110542503 A CN 202110542503A CN 113283068 B CN113283068 B CN 113283068B
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- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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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
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
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Abstract
The invention provides a method for improving alternating current sampling precision and reliability of a relay protection device, which comprises the following steps: s1, a test platform is established, and S2, test conditions are set; s3, the PC is in communication connection with the relay protection device; s4, after connection is successful, performing clock checking operation on the PC and the relay protection device; s5, performing analog wave recording operation to obtain a wave recording file; s6, converting the wave recording file into data files arranged according to COMTRADE rules by utilizing wave recording analysis software, wherein the data format is ASCII codes; and S7, calculating the sampling precision of each sampling channel according to the test conditions in the step S2, if the precision requirement is met, considering the alternating current sampling precision of the relay protection device to reach the standard, and if the precision requirement is not met, repeating the steps S1 to S7. The invention improves the alternating current sampling precision of the relay protection device, effectively prevents misoperation and refusal of the relay protection device, and greatly improves the operation reliability of the relay protection device.
Description
Technical Field
The invention belongs to the field of relay protection, and particularly relates to a method for improving alternating current sampling precision and reliability of a relay protection device.
Background
At present, the analog quantity acquisition technology of the traction substation is developed rapidly, is one of core technologies of relay protection of a traction power supply system, and is a foundation stone for intelligent, intelligentized, in-situ and multifunctional integrated high-speed development of the traction substation; the analog input signals of the relay protection device of the traction power supply system comprise voltage quantity, current quantity and the like of the secondary loop system, and the relay protection device can perform tripping outlet, closing, alarming and other protection actions through a protection algorithm; the design of the analog quantity acquisition system is that the performance of the analog quantity acquisition system directly relates to the sensitivity of a protection algorithm in the middle of the design of the relay protection device of the traction substation, and if the sampling precision is low, the risk of misoperation or refusal of the relay protection device can occur; therefore, under the development trend of intelligent, in-situ and multifunctional integration of the traction substation, higher requirements are put forward on the reliability of analog quantity acquisition.
Generally, the verification of the performance of the analog acquisition system is to increase the sampling precision of the analog acquisition system from the viewpoint of hardware circuit design so as to meet the noise immunity requirement; or in the third-party inspection mechanism with qualification, once a problem occurs in the test, the test is repeatedly modified, so that not only is the manpower and material resources consumed, but also the design scheme is possibly modified because the requirement is not met, and therefore, a method for improving the alternating current sampling precision and reliability of the relay protection device is needed.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for improving ac sampling precision and reliability of a relay protection device, so as to solve the problem of low ac sampling precision of the existing relay protection device.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a method for improving alternating current sampling precision and reliability of a relay protection device comprises the following steps:
s1, establishing an alternating current sampling test platform of the relay protection device, wherein the alternating current sampling test platform of the relay protection device comprises the relay protection device and a PC;
s2, setting alternating current sampling channel test conditions of a relay protection device;
s3, opening maintenance software at the PC end, and establishing communication connection with the relay protection device;
s4, after connection is successful, performing clock operation on the PC and the relay protection device, and ensuring that the time of the relay protection device is consistent with that of the PC;
s5, performing simulated wave recording operation by using maintenance software, obtaining original sampling value data of each synchronous sampling channel, and storing the original sampling value data into a wave recording file of the relay protection device;
s6, reading the stored wave recording files in the wave recording files of the relay protection device in the step S5 to a PC end, and converting the wave recording files into data files arranged according to rules by utilizing wave recording analysis software;
and S7, opening the recording data file converted in the step S6, calculating the sampling precision of each sampling channel according to the test conditions in the step S2, judging whether the precision requirement is met, if so, considering that the alternating current sampling precision of the relay protection device meets the standard and has high reliability, and if not, repeating the steps S1 to S7 until the alternating current sampling precision of the relay protection device meets the standard and has high reliability.
In step S1, the relay protection device includes an ac sampling module, an EEPROM for storing a wave recording file, and a first communication device;
the PC comprises a second communication device and is provided with maintenance software and wave recording analysis software;
the communication device I is connected with the communication device II and is used for communication between the PC and the relay protection device.
Further, the alternating current sampling module comprises a mutual inductor, the secondary side output end of the mutual inductor is connected with the alternating current sampling analog/digital conversion module, and the alternating current sampling analog/digital conversion module is connected with the FPGA.
Further, the transformer includes primary side input ports port1, port2 and secondary side output ports port3 and AGND.
Further, the test conditions in step S2 include:
firstly, shorting port3 and AGND at room temperature;
under the second condition, a 3V direct-current voltage signal is applied between port3 and AGND at room temperature;
thirdly, shorting port1 and port2 at room temperature;
fourthly, shorting port1 and port2 at the low temperature of-40 ℃;
fifthly, shorting port1 and port2 at a high temperature of 70 ℃;
under the condition six, shorting port1 and port2 at room temperature, performing electric fast transient pulse group immunity test on port1 and port2, and setting the pulse repetition rate to be 5kHz;
under the condition seven, shorting port1 and port2 at room temperature, performing electric fast transient pulse group immunity test on port1 and port2, and setting the pulse repetition rate to be 100kHz;
under the condition eight, at room temperature, 5A traffic is applied between port1 and port2;
exerting 5A traffic between port1 and port2 at room temperature, performing electric fast transient pulse group immunity test on port1 and port2, and setting pulse repetition rate to be 5kHz;
under the condition of ten, applying 5A traffic between port1 and port2 at room temperature, and performing electric fast transient pulse group immunity test on port1 and port2, wherein the pulse repetition rate is set to be 100kHz.
Further, the precision requirements in step S7 include:
in the first case, under the first to fifth conditions, the accuracy requirement is not more than +/-0.1%;
in the second case, under the conditions from six to ten, the accuracy requirement is not more than +/-1%.
Compared with the prior art, the method for improving the alternating current sampling precision and reliability of the relay protection device has the following beneficial effects:
according to the invention, the built alternating current sampling test platform of the relay protection device is subjected to extreme condition pressure test under different test conditions, and data is read, converted and analyzed at the PC end, so that the sampling precision of the alternating current analog acquisition module of the relay protection device is obtained, the error of an action value is not more than +/-0.1% under the measurement conditions, and the design scheme of a hardware circuit is improved and verified through repeated test, thereby improving the alternating current sampling precision of the relay protection device, reducing the labor and test cost, effectively preventing misoperation and refusal of the relay protection device, and the like, and greatly improving the operation reliability of the relay protection device.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a flow chart of a method for improving alternating current sampling precision and reliability of a relay protection device according to an embodiment of the present invention;
FIG. 2 is a block diagram of an AC sampling test platform for a relay protection device according to an embodiment of the present invention;
fig. 3 is a block diagram of an ac sampling module according to an embodiment of the present invention.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
Referring to fig. 1 to 3, a method for improving ac sampling precision and reliability of a relay protection device includes the following steps:
s1, establishing an alternating current sampling test platform of the relay protection device, wherein the alternating current sampling test platform of the relay protection device comprises the relay protection device and a PC;
s2, setting alternating current sampling channel test conditions of a relay protection device;
s3, opening maintenance software at the PC end and establishing communication connection with the relay protection device;
s4, after connection is successful, performing clock operation on the PC and the relay protection device, and ensuring that the time of the relay protection device is consistent with that of the PC;
s5, performing simulated wave recording operation by using maintenance software, obtaining original sampling value data of each synchronous sampling channel, and storing the original sampling value data into a wave recording file of the relay protection device;
s6, reading the stored wave recording files in the wave recording files of the relay protection device in the step S5 to a PC end, and converting the wave recording files into data files arranged according to COMTRADE rules by utilizing wave recording analysis software, wherein the data format is ASCII codes;
and S7, opening the recording data file converted in the step S6, calculating the sampling precision of each sampling channel according to the test conditions in the step S2, judging whether the precision requirement is met, if so, considering that the alternating current sampling precision of the relay protection device meets the standard and has high reliability, and if not, repeating the steps S1 to S7 until the alternating current sampling precision of the relay protection device meets the standard and has high reliability.
The relay protection device in the step S1 comprises an alternating current sampling module, an EEPROM (electrically erasable programmable read-Only memory) for storing a wave recording file and a communication device I, wherein the communication device I comprises an Ethernet A;
the PC comprises a communication device II, wherein the communication device II comprises an Ethernet A', and is provided with maintenance software and wave recording analysis software, the maintenance software comprises an analog wave recording module and is used for controlling the alternating current sampling module to perform analog wave recording operation, the wave recording analysis software can be used for converting wave recording files into data files which are arranged according to COMTRADE rules, and the data format is ASCII codes;
the communication device I is connected with the communication device II and is used for communication between the PC and the relay protection device.
The alternating current sampling module comprises a mutual inductor, the mutual inductor is used for converting external alternating current quantity input into analog quantity input small signals suitable for being identified by the alternating current sampling analog/digital conversion module, the secondary side output end of the mutual inductor is connected with the alternating current sampling analog/digital conversion module, the alternating current sampling analog/digital conversion module has signal conditioning and analog/digital conversion functions, and the alternating current sampling analog/digital conversion module is connected with the FPGA and used for buffering digital quantity data converted by the alternating current sampling analog/digital conversion module.
The transformer includes primary side inputs port1, port2 and secondary side outputs port3 and AGND.
The test conditions in step S2 include:
firstly, shorting port3 and AGND at room temperature;
under the second condition, a 3V direct-current voltage signal is applied between port3 and AGND at room temperature;
thirdly, shorting port1 and port2 at room temperature;
fourthly, shorting port1 and port2 at the low temperature of-40 ℃;
fifthly, shorting port1 and port2 at a high temperature of 70 ℃;
under the condition six, shorting port1 and port2 at room temperature, performing electric fast transient pulse group immunity test on port1 and port2, and setting the pulse repetition rate to be 5kHz;
under the condition seven, shorting port1 and port2 at room temperature, performing electric fast transient pulse group immunity test on port1 and port2, and setting the pulse repetition rate to be 100kHz;
under the condition eight, at room temperature, 5A traffic is applied between port1 and port2;
exerting 5A traffic between port1 and port2 at room temperature, performing electric fast transient pulse group immunity test on port1 and port2, and setting pulse repetition rate to be 5kHz;
under the condition of ten, applying 5A traffic between port1 and port2 at room temperature, and performing electric fast transient pulse group immunity test on port1 and port2, wherein the pulse repetition rate is set to be 100kHz.
The precision requirements in step S7 include:
in the first case, under the first to fifth conditions, the accuracy requirement is not more than +/-0.1%;
in the second case, under the conditions from six to ten, the accuracy requirement is not more than +/-1%.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (5)
1. The method for improving the alternating current sampling precision and reliability of the relay protection device is characterized by comprising the following steps of:
s1, establishing an alternating current sampling test platform of the relay protection device, wherein the alternating current sampling test platform of the relay protection device comprises the relay protection device and a PC;
s2, setting alternating current sampling channel test conditions of a relay protection device;
s3, opening maintenance software at the PC end and establishing communication connection with the relay protection device;
s4, after connection is successful, performing clock checking operation on the PC end and the relay protection device, and ensuring that the time of the relay protection device is consistent with that of the PC end;
s5, performing simulated wave recording operation by using maintenance software, obtaining original sampling value data of each synchronous sampling channel, and storing the original sampling value data into a wave recording file of the relay protection device;
s6, reading the stored wave recording files in the wave recording files of the relay protection device in the step S5 to a PC end, and converting the wave recording files into data files arranged according to rules by utilizing wave recording analysis software;
s7, opening the recording data file converted in the step S6, calculating the sampling precision of each sampling channel according to the test condition in the step S2, judging whether the precision requirement is met, if so, considering that the alternating current sampling precision of the relay protection device meets the standard and has high reliability, and if not, repeating the steps S1 to S7 until the alternating current sampling precision of the relay protection device meets the standard and has high reliability;
in step S1, the relay protection device comprises an alternating current sampling module, an EEPROM (electrically erasable programmable read-Only memory) for storing a wave recording file and a first communication device;
the PC comprises a second communication device and is provided with maintenance software and wave recording analysis software;
the communication device I is connected with the communication device II and is used for communication between the PC and the relay protection device.
2. The method for improving alternating current sampling precision and reliability of a relay protection device according to claim 1, wherein the method comprises the following steps: the alternating current sampling module comprises a mutual inductor, the secondary side output end of the mutual inductor is connected with an alternating current sampling analog/digital conversion module, and the alternating current sampling analog/digital conversion module is connected with the FPGA.
3. The method for improving alternating current sampling precision and reliability of a relay protection device according to claim 2, wherein the method comprises the following steps: the transformer includes primary side inputs port1, port2 and secondary side outputs port3 and AGND.
4. The method for improving alternating current sampling precision and reliability of a relay protection device according to claim 3, wherein the method comprises the following steps: the test conditions in step S2 include:
firstly, shorting port3 and AGND at room temperature;
under the second condition, a 3V direct-current voltage signal is applied between port3 and AGND at room temperature;
thirdly, shorting port1 and port2 at room temperature;
fourthly, shorting port1 and port2 at the low temperature of-40 ℃;
fifthly, shorting port1 and port2 at a high temperature of 70 ℃;
under the condition six, shorting port1 and port2 at room temperature, performing electric fast transient pulse group immunity test on port1 and port2, and setting the pulse repetition rate to be 5kHz;
under the condition seven, shorting port1 and port2 at room temperature, performing electric fast transient pulse group immunity test on port1 and port2, and setting the pulse repetition rate to be 100kHz;
under the condition eight, at room temperature, 5A traffic is applied between port1 and port2;
exerting 5A traffic between port1 and port2 at room temperature, performing electric fast transient pulse group immunity test on port1 and port2, and setting pulse repetition rate to be 5kHz;
under the condition of ten, applying 5A traffic between port1 and port2 at room temperature, and performing electric fast transient pulse group immunity test on port1 and port2, wherein the pulse repetition rate is set to be 100kHz.
5. The method for improving alternating current sampling precision and reliability of a relay protection device according to claim 4, wherein the method comprises the following steps: the precision requirements in step S7 include:
in the first case, under the first to fifth conditions, the accuracy requirement is not more than +/-0.1%;
in the second case, under the conditions from six to ten, the accuracy requirement is not more than +/-1%.
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