CN111562452A - Thermal stability checking system for grounding device of transformer substation - Google Patents
Thermal stability checking system for grounding device of transformer substation Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The invention provides a thermal stability checking system of a transformer substation grounding device, which comprises an information input module, a shunt coefficient testing device, a grounding device minimum sectional area testing subsystem, a checking calculation module, an information output module and a thermal stability testing device, wherein the information input module is used for inputting information; the checking and calculating module comprises 5 modules of judging assignment, pre-algorithm, calculation, early warning prompt, information storage and the like. The system takes the measured data of the shunt coefficient and the minimum sectional area obtained by the shunt coefficient testing device and the minimum sectional area testing subsystem of the grounding device as objective support, and improves the accuracy of the checking result. Based on the current situation developed in the electric power working site, the checking result is given by two layers of checking conclusion and early warning prompt information, so that the working pressure of regular calculation is relieved, the workload is reduced, and the working efficiency is improved. The configured thermal stability test device can sample and test the thermal stability of the grounding device and can also perfect a checking calculation method.
Description
Technical Field
The invention belongs to the grounding technology in the field of electrical engineering, and particularly relates to a thermal stability checking system for a grounding device of a transformer substation.
Background
The heat stability checking calculation is the key for the technical improvement of the grounding device and is an essential means for ensuring the safe and stable operation of the electrical equipment. GB/T50065-2011 appendix E and appendix B of ground design Specification for AC Electrical devices propose a method for verifying thermal stability of a ground conductor (line).
However, the method is suitable for the design stage of the grounding device of the transformer substation, and the influence of corrosion on the effective sectional area of the grounding device is not considered, so that a corresponding matched test method is not available; secondly, as the design stage is adopted, the shunt coefficient of the grounding device of the transformer substation is mostly estimated by adopting a model, the measurement cannot be carried out on the spot, and the accuracy of the estimation result needs to be improved. Therefore, for the operation of the transformer substation, a result obtained by calculation by the above method has a large calculation error, and the accuracy of check calculation is further influenced. Thirdly, thermal stability checking calculation of the grounding device needs to be carried out every year in principle, the number of substations of a common power supply unit is dozens or even hundreds, and the workload of checking calculation is large.
In view of this, it is necessary to develop a set of thermal stability checking system for operating the grounding device of the transformer substation, so as to improve the checking accuracy and reduce the checking workload.
Disclosure of Invention
The invention provides a thermal stability checking system for a grounding device of a transformer substation, and particularly relates to a thermal stability checking system for a grounding device of a transformer substation in operation, aiming at improving the efficiency of the thermal stability checking work of the grounding device of the transformer substation, relieving the periodic calculation pressure of the thermal stability of the grounding device and reducing unnecessary technical reconstruction investment of the grounding device.
In order to realize the purpose of the invention, the invention adopts the following technical scheme:
a thermal stability checking system for a grounding device of a transformer substation comprises an information input module, a shunt coefficient testing device, a minimum sectional area testing subsystem of the grounding device, a checking calculation module, an information output module and a thermal stability testing device, wherein the checking calculation module comprises a judgment and assignment module, a pre-algorithm module, a calculation module, an early warning prompt module and an information storage module;
the information input module is respectively connected with the judgment and assignment module and the information storage module in a one-way mode; the system comprises a judgment and assignment module, an information storage module, a verification module and a verification module, wherein the judgment and assignment module is used for judging whether the substation is checked or not;
the shunt coefficient testing device and the grounding device minimum sectional area testing subsystem are respectively in one-way communication connection with the judgment and assignment module and are used for realizing the on-site testing of the shunt coefficient of the checked substation grounding device and the on-site testing of the minimum sectional area of the grounding device and transmitting the on-site testing data of the shunt coefficient and the minimum sectional area of the grounding device to the judgment and assignment module;
the judging and assigning module is in one-way connection with the information input module, the shunt coefficient testing device and the grounding device minimum sectional area testing subsystem, receives shunt coefficient field testing data, grounding device minimum sectional area field testing data and checked substation basic information, judges and assigns the shunt coefficient and the grounding device minimum sectional area, converts the judging and assigning results into data and transmits the data to the information storage module;
the calculation module is connected with the pre-algorithm module in a one-way mode and used for extracting the algorithm pre-stored in the pre-algorithm module; the calculation module is connected with the early warning prompt module in a one-way mode and used for converting calculation results into data and transmitting the data to the early warning prompt module; the calculation module is in bidirectional connection with the information storage module and is used for extracting the information stored in the information storage module, converting the calculation result into data and then feeding back and storing the data in the information storage module;
the early warning prompting module is connected with the computing module in a one-way mode and connected with the information storage module in a two-way mode, and is used for receiving a computing result transmitted by the computing module, making early warning prompting of a checked substation by combining basic information of the checked substation extracted from the information storage module, and feeding the early warning prompting information back to the information storage module for storage;
the early warning prompting module is in one-way communication connection with the thermal stability testing device and is used for transmitting early warning prompting information to the thermal stability testing device so as to start a thermal stability test; the thermal stability test device is in one-way communication connection with the information storage module and is used for transmitting thermal stability test data to the information storage module for storage;
the information storage module is connected with the information output module in a one-way mode and used for checking the output of information.
Preferably, the information input module and the information output module are computers with network output ports, displays or printers.
Further, the information input module and the information output module are in butt joint with a power company production management system platform through an internal network.
Preferably, the shunt coefficient testing device is a substation ground wire shunt testing device with wireless transmission phase difference comparison, and the shunt coefficient testing device is used for performing field test to obtain the checked substation ground wire shunt coefficient measured value S'f1Namely the on-site test data of the shunt coefficient, and then the shunt coefficient S of the grounding device of the checked transformer substation is obtained through the following formulaf1；
Sf1＝1-S′f1。
Preferably, the grounding device minimum sectional area testing subsystem comprises a detection device, a conduction test result judging module and a grounding device minimum sectional area judging module, wherein the detection device comprises a grounding conduction tester, a thickness gauge, an electronic balance, a vernier caliper, bench clamps, a polishing harness and other measuring and polishing devices.
Preferably, the process of the grounding device minimum cross-sectional area test subsystem for conducting the grounding device minimum cross-sectional area field test is as follows:
step 1, determining a test reference point A;
selecting a neutral point of a main transformer or a grounding wire of a shell as a test reference point A, and checking and confirming that the electrical connection between the grounding wire and a main grounding grid is reliable by means of a grounding conduction test;
selecting n electrical equipment grounding wires at the same electrical interval in a checked transformer substation as test points, fixing the test reference points A according to the mode that the distances between the n test points and the test reference points A are from near to far, and then sequentially testing the resistance values between the n test points and the test reference points A; the resistance values between the test points and the test reference point A form a resistance value array R { R }1,R2,...,Rn}；
Recording any test point in the first n-1 test points as a test point j, wherein j is the serial number of the test point, and j is 1,2jThe resistance value between the test datum point A and the test point j is set;
step 3, setting an abnormal index of the resistance value, and preliminarily judging the state of the grounding device;
set as Rj≥0.7Rj+1Then, the resistance value R is determinedjAn anomaly;
according to the index to the resistance value series R { R }1,R2,...,Rj,...,RnThe front n-1 resistance values in the resistor are judged one by one, if a certain resistance value RjSatisfy Rj≥0.7Rj+1Judging that the grounding device of the test point j is abnormal;
the judgment result is the following two conditions:
resistance value array R { R }1,R2,...,Rj,...,RnIf no abnormal resistance value appears, entering step 4;
resistance value array R { R }1,R2,...,Rj,...,RnIf an abnormal resistance value appears, entering the step 5;
step 4, randomly taking 3-5 positions in the transformer substation equipment area for excavation, polishing and measuring the effective sectional area of the grounding device at each excavation position, taking the average value of the effective sectional areas of the grounding devices at each excavation position, and recording the average value as the minimum sectional area S of the grounding device of the transformer substationg；
in the first case: if the number of the test points with abnormal resistance values is 1, excavating at the test point positions, polishing and measuring the effective sectional area of the grounding device at the excavation positions, and recording the effective sectional area of the grounding device as the minimum sectional area S of the grounding device of the transformer substationg；
In the second case: if a plurality of test points with abnormal resistance values exist, excavating at a plurality of abnormal test point positions, polishing and measuring effective sectional areas of grounding devices at a plurality of excavation positions, and taking the smallest effective sectional area to record as the smallest sectional area S of the grounding device of the transformer substationg；
The minimum sectional area S of the grounding device of the transformer substation obtained in the step 4 or 5gNamely the field test data of the minimum sectional area of the grounding device;
in the step 4, the minimum sectional area S of the grounding devicegWhen the grounding device at the excavation position has two or more sectional area specifications, the minimum sectional area is respectively averaged according to the sectional area specification types and is sequentially recorded as Sg1、Sg2、Sg3A; in the step 5, the minimum sectional area S of the grounding devicegWhen the grounding device at the excavation position has two or more sectional area specifications, the minimum sectional area is respectively the minimum value according to the sectional area specification types, and is recorded as S in sequenceg1、Sg2、Sg3、...。
Preferably, the thermal stability testing apparatus comprises: the device comprises a test console, a voltage generating device, a current generating device, a short-circuit protection device and a test timing device, wherein the test timing device needs to be accurate to 0.1 ms.
Compared with the prior art, the invention has the beneficial effects that:
1. due to the influences of factors such as power grid structure change, substation grounding device expansion, grounding device corrosion and the like, the thermal stability checking calculation of the grounding device needs to be carried out every year in principle. The number of substations of a general power supply unit is dozens or even hundreds, and the workload of checking and calculating is large. The development of the checking system greatly shortens the working time and improves the working efficiency.
2. The invention introduces the shunting coefficient testing device and the minimum sectional area testing subsystem of the grounding device, can carry out corresponding field test, and blends the field test result into the verification, thereby improving the accuracy of the thermal stability verification calculation result of the grounding device of the operating transformer substation. The method is beneficial to the production management department of the network province company to make or batch-repeat the transformation plan of the grounding device of the transformer substation, and avoids unnecessary economic investment.
3. The invention is provided with an early warning prompting module, and the obtained checking result is given by two layers of checking conclusion and early warning prompting early warning.
And obtaining a checking conclusion according to a calculation method provided by the checking system based on the existing information of the checked substation. However, according to the national standard and the industrial standard, the excavation inspection time period of the grounding device of the transformer substation is six years at present, so that annual excavation and polishing measurement of the minimum sectional area of the grounding device cannot be realized when the transformer substation is operated; secondly, a transformer substation ground wire shunt test device used for wireless transmission phase difference comparison in shunt coefficient field test is also introduced into the checking system for the first time, and an estimation mode is adopted for the shunt coefficient before. The check calculation is limited by the technology, and the power supply unit cannot complete the field test of the shunt coefficients of the grounding devices of all the substations and the field test of the minimum sectional area of the grounding devices in a short period, so the system combines the historical check information of the substations, gives a conclusion according to the severity of the reconstruction requirements, and is provided with an early warning prompt module.
According to the check conclusion, by combining the operation time of the transformer substation, the on-site test of the shunt coefficient of the grounding device and the completion condition of the on-site test work of the minimum sectional area of the grounding device, the system gives a supplementary conclusion, namely, the early warning prompt information at the early warning prompt module. The arrangement of the module practically considers the actual situation of electric field operation, i.e. the urgent need of checking the thermal stability of the grounding device of the transformer substation is relieved, and the contradiction between the work that the field test of the shunt coefficient of all the transformer substations cannot be completed in a short period, the work of excavating, polishing and measuring the minimum sectional area of the grounding device station by station, and the like is avoided. With the help of early warning prompt information, the power supply unit can arrange transformation work of the substation grounding device which does not meet the requirements in order according to the urgent degree of transformation requirements.
4. This system is provided with thermal stability test device. For the transformer substation grounding device which needs technical capacity increasing transformation, a thermal stability test device can be used for carrying out thermal stability test after a checked transformer substation grounding device sample is obtained in advance. The test result can be used for testing the thermal stability check result of the grounding device, so that unnecessary economic investment is avoided, and the operating cost of power enterprises is saved; meanwhile, the algorithm used by the pre-algorithm module of the checking system can be corrected and perfected.
Drawings
Fig. 1 is a schematic structural diagram of a thermal stability checking system of a substation grounding device.
Fig. 2 is a schematic structural diagram of a minimum cross-sectional area testing subsystem of the grounding device.
Fig. 3 is a flow chart of an implementation of a testing method of a minimum cross-sectional area testing subsystem of a grounding device.
Fig. 4 is a schematic diagram illustrating a conduction test of an effective cross-sectional area of a grounding device.
In fig. 4: 0-test reference point a, 1-ground line 1, 2-ground line 2, 3-ground line 3, 4-ground line 4, 5-ground line 5, 6-ground device grid; 7-ground line 1 ', 8-ground line 2 ', 9-ground line 3 ', 10-ground line 4 ', 11-ground line 5 '.
Detailed description of the invention
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Fig. 1 is a schematic structural diagram of a thermal stability checking system of a substation grounding device. As shown in fig. 1, the invention relates to a thermal stability checking system for a grounding device of a transformer substation, which comprises an information input module 1, a shunt coefficient testing device 2, a testing subsystem 3 for the minimum sectional area of the grounding device, a checking calculation module 4, an information output module 5 and a thermal stability testing device 6. The checking and calculating module 4 comprises a judgment and assignment module 41, a pre-algorithm module 42, a calculating module 43, an early warning prompting module 44 and an information storage module 45.
The information input module 1 is respectively connected with the judgment assignment module 41 and the information storage module 45 in a one-way mode; the system is used for inputting basic information of the checked substation and respectively transmitting the information to the judgment and assignment module 41 and the information storage module 45.
In the embodiment, the information input module 1 and the information output module 5 are computers with network output ports, displays or printers. The information input module 1 and the information output module 5 are in butt joint with a power company production management system platform 7 through an internal network. Therefore, when information is input, the basic information of the checked substation can be directly input, or the basic information of the checked substation can be directly extracted from the power company production management system platform 7, or the information of the thermal stability check system of other substation grounding devices can be extracted by the power company production management system platform 7.
In an embodiment, the checked basic substation information, that is, information required for the thermal stability check calculation of the substation grounding device includes: the method comprises the following steps of belonging unit, transformer station name, operation time, voltage grade, main wiring form, grounding device material, grounding device sectional area design specification, protection configuration mode, main protection sleeve number, main transformer neutral point grounding mode, transformer station grounding device shunt coefficient field test condition and transformer station grounding device minimum sectional area field measurement condition.
The shunt coefficient testing device 2 and the grounding device minimum sectional area testing subsystem 3 are respectively connected with the judging and assigning module 41 in a one-way communication mode, and are used for realizing the on-site testing of the shunt coefficient of the grounding device of the checked substation and the on-site testing of the minimum sectional area of the grounding device, and transmitting the on-site testing data of the shunt coefficient and the on-site testing data of the minimum sectional area of the grounding device to the judging and assigning module 41.
In factIn the embodiment, the shunt coefficient testing device 2 is a transformer substation ground wire shunt testing device for wireless transmission phase difference comparison. In the method for checking the thermal stability of the grounding device of the transformer substation, the shunt coefficient S of the grounding device of the checked transformer substation needs to be determinedf1. In the invention, firstly, the ground wire shunt test device of the checked transformer substation is tested on the spot through the ground wire shunt test device of the transformer substation for wireless transmission phase difference comparison, and the test value is the ground wire shunt coefficient measurement value S 'of the checked transformer substation'f1Then using the formula Sf1＝1-S′f1Obtaining the shunting coefficient S of the grounding device of the checked transformer substationf1。
Fig. 2 is a schematic structural diagram of the minimum cross-sectional area testing subsystem 3 of the grounding device. Fig. 3 is a flow chart of an implementation of a testing method of a minimum cross-sectional area testing subsystem of a grounding device. Fig. 4 is a schematic diagram illustrating a conduction test of an effective cross-sectional area of a grounding device.
In an embodiment, the grounding device minimum cross-sectional area testing subsystem 3 includes a detecting device 31, a conduction test result determining module 32, and a grounding device minimum cross-sectional area determining module 33, and the detecting device 31 includes a grounding conduction tester, a thickness gauge, an electronic balance, a vernier caliper, a bench clamp, a polishing harness, and other measuring and polishing devices.
In the method for checking the thermal stability of the grounding device of the transformer substation, an important step is to utilize a conduction tester to conduct conduction test on the grounding device, and to excavate and measure on the spot to obtain the minimum sectional area S of the grounding device of the transformer substationg. Specifically, the process of performing the field test of the minimum sectional area of the grounding device by using the system of the minimum sectional area test sub-3 of the grounding device is as follows:
step 1, determining a test reference point A;
selecting a neutral point of a main transformer or a grounding wire of a shell as a test reference point A, and checking and confirming that the electrical connection between the grounding wire and a main grounding grid is reliable by means of a grounding conduction test;
selecting n electrical devices at the same electrical interval in the checked substationThe grounding wire is used as a test point, and after the test reference point A is fixed according to the mode that the distance between n test points and the test reference point A is from near to far, the resistance values between the n test points and the test reference point A are sequentially tested; the resistance values between the test points and the test reference point A form a resistance value array R { R }1,R2,...,Rn}；
Recording any test point in the first n-1 test points as a test point j, wherein j is the serial number of the test point, and j is 1,2jThe resistance value between the test datum point A and the test point j is set;
step 3, setting an abnormal index of the resistance value, and preliminarily judging the state of the grounding device;
set as Rj≥0.7Rj+1Then, the resistance value R is determinedjAn anomaly;
according to the index to the resistance value series R { R }1,R2,...,Rj,...,RnThe front n-1 resistance values in the resistor are judged one by one, if a certain resistance value RjSatisfy Rj≥0.7Rj+1Judging that the grounding device of the test point j is abnormal;
the judgment result is the following two conditions:
resistance value array R { R }1,R2,...,Rj,...,RnIf no abnormal resistance value appears, entering step 4;
resistance value array R { R }1,R2,...,Rj,...,RnIf an abnormal resistance value appears, entering the step 5;
step 4, randomly taking 3-5 positions in the transformer substation equipment area for excavation, polishing and measuring the effective sectional area of the grounding device at each excavation position, taking the average value of the effective sectional areas of the grounding devices at each excavation position, and recording the average value as the minimum sectional area S of the grounding device of the transformer substationg；
in the first case: if the number of the test points with abnormal resistance is 1, excavating at the test point position, and polishingMeasuring the effective sectional area of the grounding device at the excavation position, and recording the effective sectional area of the grounding device as the minimum sectional area S of the grounding device of the transformer substationg；
In the second case: if a plurality of test points with abnormal resistance values exist, excavating at a plurality of abnormal test point positions, polishing and measuring effective sectional areas of grounding devices at a plurality of excavation positions, and taking the smallest effective sectional area to record as the smallest sectional area S of the grounding device of the transformer substationg；
The minimum sectional area S of the grounding device of the transformer substation obtained in the step 4 or 5gNamely the field test data of the minimum sectional area of the grounding device;
in the step 4, the minimum sectional area S of the grounding devicegWhen the grounding device at the excavation position has two or more sectional area specifications, the minimum sectional area is respectively averaged according to the sectional area specification types and is sequentially recorded as Sg1、Sg2、Sg3A; in the step 5, the minimum sectional area S of the grounding devicegWhen the grounding device at the excavation position has two or more sectional area specifications, the minimum sectional area is respectively the minimum value according to the sectional area specification types, and is recorded as S in sequenceg1、Sg2、Sg3、...。
The introduction of the shunt coefficient testing device 2 and the grounding device minimum sectional area testing subsystem 3 can carry out corresponding field testing, and the field testing result is merged into the checking, so that the accuracy of the thermal stability checking calculation result of the grounding device of the operating transformer substation is improved.
The judgment and assignment module 41 is unidirectionally connected with the information input module 1, the shunt coefficient testing device 2 and the grounding device minimum sectional area testing subsystem 3, receives shunt coefficient field test data, grounding device minimum sectional area field test data and checked substation basic information, judges and assigns the shunt coefficient and the grounding device minimum sectional area, converts the judgment and assignment results into data and transmits the data to the information storage module 45.
In the embodiment, the excavation inspection time period of the grounding device of the transformer substation is regulated to be six years by national standards and row standards, so that the minimum sectional area of the grounding device cannot be excavated and polished every year when the transformer substation is operated; secondly, a transformer substation ground wire shunt test device used for wireless transmission phase difference comparison in shunt coefficient field test is also introduced into the checking system for the first time, and the current shunt coefficient adopts an estimation mode, so that the estimation result is not very accurate. The limitation of checking calculation based on the problems causes that a power supply unit cannot complete the field test of the shunt coefficient of the grounding device of dozens or even hundreds of substations governed by the power supply unit and the field test of the minimum sectional area of the grounding device in a short period; therefore, the system provides a specific judgment and assignment method for the shunt coefficient and the minimum sectional area of the grounding device in the checking calculation of the checking year of the school according to the historical checking information of the transformer substation, the specific completion conditions of the on-site test of the shunt coefficient of the grounding device of the checked transformer substation and the specific completion conditions of the on-site test of the minimum sectional area of the grounding device in the checking year of the school by using the judgment and assignment module 41.
Specifically, in the embodiment, the judgment and assignment module 41 makes the following judgment and assignment according to the historical checking information and the field measurement condition of the substation:
1) if the field test of the shunt coefficient of the grounding device is carried out, judging the data transmitted by the shunt coefficient testing device 2 adopted by the assignment module 41; if not, the evaluation module 41 uses the history data stored in the information input module. Meanwhile, the system is provided with a shunting coefficient error correction function, and the requirement is 0<Sf1<1; if the historical data without the shunt coefficient exists, the system automatically assigns Sf1＝1。
2) If the field test work of the minimum sectional area of the grounding device is carried out, the evaluation module 41 judges the data transmitted by the testing subsystem 3 of the minimum sectional area of the grounding device; if not, the judgment assignment module 41 uses the history data stored in the information input module, i.e., selects the designed sectional area of the grounding device and assigns it to the minimum sectional area of the grounding device.
Further, in this embodiment, the judgment and assignment module 41 converts the judgment and assignment results into data, and transmits the data to the information storage module 45.
The calculation module 43 is connected to the pre-algorithm module 42 in a unidirectional manner, and is configured to extract an algorithm pre-stored in the pre-algorithm module 42. The calculation module 43 is connected to the information storage module 45 in a bidirectional manner, and is configured to extract information stored in the information storage module 45, including the assignment result transmitted by the assignment judgment module 41 and the checked substation basic information. And then, calculating according to the algorithm extracted from the pre-algorithm module 42 according to the information, converting the calculation result into data, and feeding back and storing the data in the information storage module 45.
In particular, the information output by the calculation module 43 comprises a check of the short-circuit current IjhShort circuit equivalent duration teThe required sectional area S of the grounding device, a check conclusion and the like. The checking conclusion obtained by the checking calculation module 4 is divided into two types:
if SgIf the temperature is more than or equal to S, judging that the thermal stability of the grounding device of the transformer substation meets the current operation requirement;
if Sg<And S, the thermal stability of the grounding device of the checked transformer substation does not meet the current operation requirement.
Further, the calculation module 43 is connected to the early warning module 44 in a single direction, and is configured to convert the calculation result into data and transmit the data to the early warning module 44.
The early warning prompt module 44 is connected with the calculation module 43 in a unidirectional manner and connected with the information storage module 45 in a bidirectional manner, and is configured to receive the calculation result transmitted by the calculation module 43, make an early warning prompt of the checked substation by combining with the basic information of the checked substation extracted from the information storage module 45, and feed back the early warning prompt information to the information storage module 45 for storage.
In the embodiment, according to the foregoing, the judgment and assignment module 41 makes the judgment and assignment of the shunt coefficient and the minimum sectional area of the grounding device in the checking calculation of the checking year according to the historical checking information of the transformer substation and the specific completion conditions of the field test of the shunt coefficient and the field test of the minimum sectional area of the grounding device of the checked transformer substation in the checking year.
Further, in the embodiment, the early warning prompting module 44 combines the checking conclusion transmitted from the calculating module 43, the judgment and assignment result information transmitted from the judgment and assignment module 41 to the information storage module 45, and the basic information of the checked substation transmitted from the information input module 1 to the information storage module 45 to provide a supplementary conclusion, that is, early warning prompting information. The check calculation is limited by the technology, and the power supply unit cannot complete the field test of the shunt coefficients of the grounding devices of all the substations and the field test of the minimum sectional area of the grounding devices in a short period, so the system combines the historical check information of the substations, gives a conclusion according to the severity of the reconstruction requirements, and is provided with an early warning prompt module. Therefore, the system gives the checking result from two levels of checking conclusion and early warning prompt information. The arrangement of the early warning prompt module 44 practically considers the actual situation of the electric field operation, i.e. the urgent need of checking the thermal stability of the grounding device of the transformer substation is relieved, and the contradiction between the work that the field test of the shunt coefficient of all the transformer substations cannot be completed in a short period, the work of excavating, polishing and measuring the minimum sectional area of the grounding device station by station, and the like is solved. With the help of early warning prompt information, the power supply unit can arrange transformation work of the substation grounding device which does not meet the requirements in order according to the urgent degree of transformation requirements.
The early warning prompt module 44 is connected with the thermal stability test device 6 in a one-way communication manner, and is used for transmitting early warning prompt information to the thermal stability test device 6 so as to start a thermal stability test. The thermal stability test device 6 is connected with the information storage module 45 in a one-way communication manner, and is used for transmitting thermal stability test data to the information storage module 45 for storage.
In the embodiment, for a transformer substation which needs technical capacity increase transformation, the early warning prompting module 44 transmits early warning prompting information to the thermal stability testing device 6, and starts a thermal stability test. For the transformer substation grounding device needing technical capacity increase transformation, a thermal stability test device can be used for carrying out thermal stability test after a checked transformer substation grounding device sample is obtained in advance. The existence of the thermal stability test device 6 can perfect the technical capacity-increasing transformation scheme planned by a power supply unit, can also check the thermal stability check result of the grounding device, and can correct and perfect the algorithm of the check system.
In an embodiment, the thermal stability testing apparatus 6 comprises: the device comprises a test console, a voltage generating device, a current generating device, a short-circuit protection device and a test timing device, wherein the test timing device needs to be accurate to 0.1 ms.
The information storage module 45 is connected with the information output module 5 in a unidirectional manner, and is used for outputting the check information.
The method for checking the thermal stability of the grounding device of the transformer substation by using the checking system comprises the following steps:
s1, acquiring information required by the thermal stability check calculation of the grounding device of the transformer substation;
the information required by the checking calculation of the substation grounding device comprises the following information: the method comprises the following steps of belonging units, transformer substation names, operation time, voltage levels, main wiring forms, grounding device materials, grounding device sectional area design specifications, protection configuration modes, main protection sleeve numbers, main transformer neutral point grounding modes, transformer substation grounding device shunt coefficient field test conditions and transformer substation grounding device minimum sectional area field measurement conditions;
s2, determining the grounding short-circuit current difference I of the checked substation in the maximum operation mode of the power system△；
I△＝Imax-In
In the formula ImaxThe maximum grounding short-circuit current I is the maximum grounding short-circuit current when the grounding short-circuit occurs in the transformer substation under the maximum operation mode of the power systemnThe current flowing through the neutral point of the electrical equipment when the grounding short circuit occurs in the transformer substation;
s3, determining the equivalent short-circuit duration te；
For a transformer substation configured with two sets of quick-acting active protection and breaker failure protection:
te＝tm+tf+to
in the formula, tmThe main protection action time; t is tfThe time for the failure protection action; t is toThe circuit breaker open time;
for a substation configured with a set of quick-action active protection:
te＝to+tr
in the formula, trThe action time of the next-stage backup protection is obtained;
if the number of the next-stage backup protection devices is 2 or more than 2, selecting the maximum value of the action time of all the next-stage backup protection devices as the action time t of the next-stage backup protectionr；
Main protection action time tmTime t of malfunction protection actionfTime t of opening of circuit breakeroAnd the action time t of the back-up protection of the next stagerLooking up the data of the transformer substation;
s4, determining the shunt coefficient S of the grounding device of the transformer substation through field testf1；
Sf1＝1-S′f1
Of formula (II) S'f1Carrying out on-site test and acquisition on a transformer substation ground wire shunt coefficient measured value through a transformer substation ground wire shunt test device with wireless transmission phase difference comparison;
s5, determining the short-circuit current I for checkingjh；
Ijh＝I△Sf1
Specially, for the neutral point grounding wire independent section of the single-phase main transformer with the voltage class of 500kV or above, under the maximum operation mode of the power system, when the short circuit occurs in the transformer substation with the voltage class of 500kV or above, the three-phase symmetrical short-circuit current I(3)Greater than the difference of grounding short-circuit current I△Then, the short-circuit current I for calibration is calculated according to the following formulajh：
Ijh＝I(3)Sf1
In the formula, three-phase symmetrical short-circuit current I when short circuit occurs in a transformer substation with voltage class of 500kV or above(3)Obtaining the load through a PSD-BPA load flow calculation program;
s6, determining the required sectional area S of the grounding device of the transformer substation;
in the formula, C is the thermal stability coefficient of the grounding device of the transformer substation, and is obtained by consulting the national standard;
s7, carrying out field test on the minimum sectional area of the grounding device by using the minimum sectional area test subsystem of the grounding device;
selecting a main transformer grounding wire as a measurement datum point, sequentially carrying out grounding conduction test on the grounding wires of all electrical equipment in the electrical interval according to a mode that the grounding wire of all electrical equipment in the same electrical interval is far from the measurement datum point A, searching abnormal points of the grounding device of the transformer substation, taking the abnormal points as excavation inspection positions, carrying out excavation and field measurement, and obtaining the minimum sectional area S of the grounding device of the transformer substationg。
S8, comparing the required sectional area S of the grounding device of the transformer substation obtained in the S6 with the minimum sectional area S of the grounding device of the transformer substation obtained in the S7gJudging whether the thermal stability of the grounding device of the transformer substation meets the current operation requirement:
if SgIf the temperature is more than or equal to S, judging that the thermal stability of the grounding device of the transformer substation meets the current operation requirement;
if Sg<And S, judging that the thermal stability of the grounding device of the transformer substation can not meet the current operation requirement.
And S9, based on the checking conclusion obtained in S8, combining the basic information of the checked substation, the field test condition of the shunt coefficient and the field test condition of the minimum sectional area of the grounding device, and finally providing early warning prompt information of the thermal stability of the grounding device of the checked substation.
And S10, starting the thermal stability test device to perform the thermal stability test of the sample of the grounding device of the checked substation for the substation needing technical capacity increase transformation, and comparing the thermal stability check calculation result of the grounding device of the checked substation.
Claims (7)
1. The thermal stability checking system for the grounding device of the transformer substation is characterized by comprising an information input module (1), a shunt coefficient testing device (2), a minimum sectional area testing subsystem (3) of the grounding device, a checking calculation module (4), an information output module (5) and a thermal stability testing device (6), wherein the checking calculation module (4) comprises a judgment assignment module (41), a pre-algorithm module (42), a calculation module (43), an early warning prompt module (44) and an information storage module (45);
the information input module (1) is respectively connected with the judgment assignment module (41) and the information storage module (45) in a one-way mode; the system is used for inputting basic information of the checked transformer substation and respectively transmitting the information to a judgment and assignment module (41) and an information storage module (45);
the shunt coefficient testing device (2) and the grounding device minimum sectional area testing subsystem (3) are respectively in one-way communication connection with the judging and assigning module (41) and are used for realizing the on-site testing of the shunt coefficient and the minimum sectional area of the grounding device of the checked transformer substation, and transmitting the on-site testing data of the shunt coefficient and the minimum sectional area of the grounding device to the judging and assigning module (41);
the judgment and assignment module (41) is in one-way connection with the information input module (1), the shunt coefficient testing device (2) and the grounding device minimum sectional area testing subsystem (3), receives shunt coefficient field testing data, grounding device minimum sectional area field testing data and checked substation basic information, judges and assigns the shunt coefficient and the grounding device minimum sectional area, converts the judgment and assignment results into data and transmits the data to the information storage module (45);
the calculation module (43) is connected with the pre-algorithm module (42) in a one-way mode and is used for extracting the algorithm pre-stored in the pre-algorithm module (42); the calculation module (43) is unidirectionally connected with the early warning prompt module (44) and is used for converting calculation results into data and transmitting the data to the early warning prompt module (44); the calculation module (43) is bidirectionally connected with the information storage module (45) and is used for extracting the information stored in the information storage module (45), converting the calculation result into data and then feeding back the data to be stored in the information storage module (45);
the early warning prompt module (44) is connected with the calculation module (43) in a one-way mode and is connected with the information storage module (45) in a two-way mode, and is used for receiving the calculation result transmitted by the calculation module (43), making an early warning prompt of the checked substation by combining basic information of the checked substation extracted from the information storage module (45), and feeding the early warning prompt information back to the information storage module (45) for storage;
the early warning prompt module (44) is in one-way communication connection with the thermal stability test device (6) and is used for transmitting early warning prompt information to the thermal stability test device (6) so as to start a thermal stability test; the thermal stability test device (6) is in one-way communication connection with the information storage module (45) and is used for transmitting thermal stability test data to the information storage module (45) for storage;
the information storage module (45) is connected with the information output module (5) in a one-way mode and used for outputting the checking information.
2. The thermal stability checking system for the substation grounding device according to claim 1, wherein the information input module (1) and the information output module (5) are computers with network output ports, displays or printers.
3. The substation grounding device thermal stability checking system according to claim 1 or 2, characterized in that the information input module (1) and the information output module (5) are interfaced with a power company production management system platform (7) through an internal network.
4. The thermal stability checking system for the substation grounding device according to claim 1, wherein the shunt coefficient testing device (2) is a substation ground wire shunt testing device with wireless transmission phase difference comparison, and the shunt coefficient testing device (2) is used for performing field test to obtain a checked substation ground wire shunt coefficient measured value S'f1Namely the on-site test data of the shunt coefficient, and then the shunt coefficient S of the grounding device of the checked transformer substation is obtained through the following formulaf1；
Sf1＝1-S′f1。
5. The substation grounding device thermal stability checking system according to claim 1, wherein the grounding device minimum sectional area testing subsystem (3) comprises a detection device (31), a conduction test result judgment module (32) and a grounding device minimum sectional area judgment module (33), and the detection device (31) comprises a grounding conduction tester, a thickness gauge, an electronic balance, a vernier caliper, a bench clamp, a polishing harness and other measuring and polishing devices.
6. The substation grounding device thermal stability checking system according to claim 5, wherein the grounding device minimum cross-sectional area test subsystem (3) performs a grounding device minimum cross-sectional area field test as follows:
step 1, determining a test reference point A;
selecting a neutral point of a main transformer or a grounding wire of a shell as a test reference point A, and checking and confirming that the electrical connection between the grounding wire and a main grounding grid is reliable by means of a grounding conduction test;
step 2, determining a test point and carrying out a conduction test;
selecting n electrical equipment grounding wires at the same electrical interval in a checked transformer substation as test points, fixing the test reference points A according to the mode that the distances between the n test points and the test reference points A are from near to far, and then sequentially testing the resistance values between the n test points and the test reference points A; the resistance values between the test points and the test reference point A form a resistance value array R { R }1,R2,...,Rn}；
Recording any test point in the first n-1 test points as a test point j, wherein j is the serial number of the test point, and j is 1,2jThe resistance value between the test datum point A and the test point j is set;
step 3, setting an abnormal index of the resistance value, and preliminarily judging the state of the grounding device;
set as Rj≥0.7Rj+1Then, the resistance value R is determinedjAn anomaly;
according to the index to the resistance value series R { R }1,R2,...,Rj,...,RnThe front n-1 resistance values in the resistor are judged one by one, if a certain resistance value RjSatisfy Rj≥0.7Rj+1Judging that the grounding device of the test point j is abnormal;
the judgment result is the following two conditions:
resistance value array R { R }1,R2,...,Rj,...,RnIf no abnormal resistance value appears, entering step 4;
resistance value array R { R }1,R2,...,Rj,...,RnIf an abnormal resistance value appears, entering the step 5;
step 4, randomly taking 3-5 positions in the transformer substation equipment area for excavation, polishing and measuring the effective sectional area of the grounding device at each excavation position, taking the average value of the effective sectional areas of the grounding devices at each excavation position, and recording the average value as the minimum sectional area S of the grounding device of the transformer substationg；
Step 5, excavating the abnormal test point position obtained in the step 3, wherein the method specifically comprises the following two conditions:
in the first case: if the number of the test points with abnormal resistance values is 1, excavating at the test point positions, polishing and measuring the effective sectional area of the grounding device at the excavation positions, and recording the effective sectional area of the grounding device as the minimum sectional area S of the grounding device of the transformer substationg；
In the second case: if a plurality of test points with abnormal resistance values exist, excavating at a plurality of abnormal test point positions, polishing and measuring effective sectional areas of grounding devices at a plurality of excavation positions, and taking the smallest effective sectional area to record as the smallest sectional area S of the grounding device of the transformer substationg；
The minimum sectional area S of the grounding device of the transformer substation obtained in the step 4 or 5gNamely the field test data of the minimum sectional area of the grounding device;
in the step 4, the minimum sectional area S of the grounding devicegWhen the grounding device at the excavation position has two or more sectional area specifications, the minimum sectional area is respectively averaged according to the sectional area specification types and is sequentially recorded as Sg1、Sg2、Sg3A; in the step 5, the minimum sectional area S of the grounding devicegWhen the grounding device at the excavation position has two or more sectional area specifications, the minimum sectional area is determined according toThe sectional area specification types are respectively taken as the minimum values and are recorded as S in sequenceg1、Sg2、Sg3、...。
7. A substation grounding device thermal stability verification system according to claim 1, characterized in that said thermal stability test device (6) comprises: the device comprises a test console, a voltage generating device, a current generating device, a short-circuit protection device and a test timing device, wherein the test timing device needs to be accurate to 0.1 ms.
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