CN211426639U - Accurate measurement system for ground grid of operating transformer substation - Google Patents
Accurate measurement system for ground grid of operating transformer substation Download PDFInfo
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- CN211426639U CN211426639U CN201921541307.7U CN201921541307U CN211426639U CN 211426639 U CN211426639 U CN 211426639U CN 201921541307 U CN201921541307 U CN 201921541307U CN 211426639 U CN211426639 U CN 211426639U
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Abstract
The utility model discloses an accurate measuring system for the ground grid of an operating transformer substation, which comprises a central processing module, a power input module, a variable frequency power supply module, a signal acquisition module, a communication module, a PC upper computer, a grounding electrode and a control panel, wherein the utility model is provided with a loop resistance module, a test resistance module and a standard resistance module between the central processing module and a power supply, so that the power frequency equivalence of the measurement is good, the test data is stable and reliable, the measurement precision is high, and the signal acquisition module is provided with a filtering module which carries out filtering processing on the sampling signal, and then effectively eliminate the influence of power frequency interference on ground resistance measurement, solve the anti-interference problem in the testing process, simplified the experimental operation process, improved the precision and the accuracy of test result, reduced experimenter's intensity of labour and test cost.
Description
Technical Field
The utility model relates to a ground net measurement system technical field specifically is operation transformer substation ground net accurate measurement system.
Background
The electric power basic construction in China develops rapidly, and with the increase of rated voltage levels of systems and the increasing of high-voltage and large-capacity substations, a plurality of large and ultra-large grounding grids appear. The working condition of the grounding grid is directly related to personal safety and safe operation of power equipment and a power system. The safety state of the grounding grid can be accurately evaluated by the grounding grid measurement, and the method has very important significance for ensuring the safe and reliable operation of a power system and the personal safety of the working personnel of the transformer substation.
The grounding grid measurement is to connect a plurality of grounding bodies with a grounding main line into a network, has the characteristics of reliable grounding and small grounding resistance, is suitable for the grounding requirement of a large amount of electrical equipment, and is widely used in a transformer substation at present. The measurement of the grounding resistance of the grounding grid of the transformer substation in operation is interfered by the current flowing into the grounding grid by a system and the interference among test lead wires, so that a test result has larger error, the measurement precision is low, the working difficulty of testers is increased, and the measurement method can greatly influence the test result of the grounding resistance of a large grounding grid.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem lie in overcoming prior art's interference immunity poor and measurement accuracy low grade defect, provide operation transformer substation's earth mat accurate measurement system. The accurate measurement system for the ground grid of the operating transformer substation has the characteristics of good anti-interference performance, high measurement accuracy and the like.
In order to achieve the above object, the utility model provides a following technical scheme: operation transformer substation's accurate measurement system of earth mat, including central processing module, power input module, signal acquisition module, earthing pole and control panel, central processing module's output is connected to control panel's input, signal acquisition module is installed to central processing module's input, variable frequency power supply module is installed to power input module's output, variable frequency power supply module connects the earthing pole, communication module is installed to central processing module's output, communication module's end-to-end connection has the PC host computer.
Preferably, be provided with current utmost point, first voltage utmost point, second voltage utmost point, ground connection net utmost point and earthing pole on control panel's the antetheca, the current utmost point is connected with the current line, through current line connection electric current stake, first voltage utmost point is connected with first voltage line, connects first voltage stake through first voltage line, the second voltage utmost point is connected with second voltage line, connects second voltage stake through second voltage line, ground connection net utmost point and downlead line connection connect the ground net through the downlead, earthing pole ground connection, the last setting and the installation of structure of control panel for staff's detection work becomes more convenient and clear, and then has improved the efficiency of detection.
Preferably, still be provided with switch, power socket, communication interface, display and the button district that charges on the control panel, switch and the equal electric connection power input module of power socket that charges, the display passes through signal connection central processing module, and communication interface is the RS232 interface setting, and the display can show measuring result, and is directly perceived clear.
Preferably, the signal acquisition module is respectively and correspondingly connected with the current pole and the two voltage poles, and can acquire a current signal in the current pole C and a voltage signal in the two voltage poles P.
Preferably, the signal acquisition module is set up for AD sampling circuit, and is provided with the filtering module in the signal acquisition module, and the filtering module carries out filtering processing to the sampled signal, and then effectively eliminates power frequency interference to ground resistance measuring's influence, has certain anti-interference effect.
Preferably, the power output end of the power input module is connected with the power port of the central processing module, and the power input module is sequentially connected with the loop resistance module, the test resistance module and the standard resistance module, one end of the loop resistance module is connected with one end of the power input module, just the other end of the loop resistance module is connected with one end of the test resistance module, the other end of the test resistance module is connected with one end of the standard resistance module, the other end of the standard resistance module is connected with the input end of the central processing module, and through the arrangement of the loop resistance module, the test resistance module and the standard resistance module, the precision and accuracy of a test result are improved, and the labor intensity and the test cost of testers are reduced.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model discloses a between central processing module and power, the loop resistance module, test resistance module and the standard resistance module of setting for measuring power frequency equivalence is good, and test data is reliable and stable, and measurement accuracy is high.
2. The utility model discloses a be provided with filtering module in the signal acquisition module, filtering module carries out filtering treatment to sampling signal, and then effectively eliminates power frequency interference to the influence of ground resistance measurement, has solved the anti-interference problem in the testing process, has simplified experimental operation process, has improved the precision and the accuracy of test result, has reduced testing personnel's intensity of labour and test cost; in summary, the accurate measurement system for the grounding grid of the operating transformer substation has the advantages of good anti-interference performance, high measurement precision, rich functions, convenience in operation and observation and the like.
Drawings
FIG. 1 is a structural diagram of the precision measurement system of the utility model;
fig. 2 is a schematic view of the structural arrangement on the control panel of the present invention.
Reference numbers in the figures: 1. a central processing module; 2. a power input module; 3. a variable frequency power supply module; 4. a signal acquisition module; 5. a communication module; 6. a PC upper computer; 7. a ground electrode; 8. a control panel.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides a technical solution: the accurate measurement system for the ground grid of the operating transformer substation comprises a central processing module 1, a power input module 2, a signal acquisition module 4, a grounding electrode 7 and a control panel 8, wherein the input end of the control panel 8 is connected with the output end of the central processing module 1, the input end of the central processing module 1 is provided with the signal acquisition module 4, the output end of the power input module 2 is provided with a variable frequency power supply module 3, the power output end of the power input module 2 is connected with the power port of the central processing module 1, the power input module 2 is sequentially connected with a loop resistance module, a test resistance module and a standard resistance module, one end with the loop resistance module is connected with one end of the power input module 2, the other end of the loop resistance module is connected with one end of the test resistance module, and the other end of the test resistance module is connected with one end of the standard resistance module, the other end of the standard resistance module is connected with the input end of the central processing module 1, the precision and the accuracy of a test result are improved and the labor intensity and the test cost of a tester are reduced by arranging the loop resistance module, the test resistance module and the standard resistance module, the frequency conversion power supply module 3 is connected with the grounding electrode 7, the communication module 5 is arranged at the output end of the central processing module 1, the tail end of the communication module 5 is connected with the PC upper computer 6, the front wall of the control panel 8 is provided with a current electrode, a first voltage electrode, a second voltage electrode, a grounding grid electrode and the grounding electrode 7, the current electrode is connected with the current wire, the current pile is connected through the current wire, the first voltage electrode is connected with the first voltage wire, the first voltage pile is connected through the first voltage wire, the second voltage electrode is connected with the second voltage wire, the second voltage pile is connected through the second voltage wire, the grounding grid electrode is connected with the down lead, the detection device is connected with a ground grid through a down lead, the grounding electrode 7 is grounded, and the structure on the control panel 8 is arranged and installed, so that the detection work of workers becomes more convenient, more convenient and clearer, and further the detection efficiency is improved; the signal acquisition module 4 corresponds between being connected with current pole and two voltage poles respectively, can gather the voltage signal among current signal and two voltage poles P in the current pole C, and signal acquisition module 4 is AD sampling circuit setting, and is provided with the filter module in the signal acquisition module 4, and the filter module carries out filtering to the sampled signal, and then effectively eliminates the influence of power frequency interference to ground resistance measurement, has certain anti-jamming effect.
The working principle, in the utility model, at first, the current pole, the first voltage pole, the second voltage pole, the grounding grid pole and the grounding pole 7 are arranged on the front wall of the control panel 8, the corresponding inserted current line is connected with two voltage lines, and the grounding grid is connected through the down lead, the grounding pole 7 is grounded, then the test system is started, the test system is respectively connected with the current pole C and the voltage pole P through the signal acquisition module 4, the current signal in the current pole C and the voltage signal in the voltage pole P can be acquired, the acquired current and voltage signals are effectively filtered, the interference of power frequency signals is filtered, the filtered current and voltage signals are adjusted and A/D converted, and then the filtered current and voltage signals are sent to the central processing module 1, the central processing module 1 can obtain the current and voltage data, digital filtering is carried out, the grounding resistance value under each frequency is obtained, and the grounding resistance value under each frequency is transmitted to the PC upper computer 6 through the communication module, the PC upper computer 6 can interpolate the received ground resistance values at the respective frequencies by using an interpolation method to obtain the ground resistance value at the fixed frequency, and simultaneously, the measurement results can be synchronously displayed on the corresponding display through the setting of the communication module 5.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. Accurate measurement system of operation transformer substation's earth mat includes central processing module (1), power input module (2), signal acquisition module (4), earthing pole (7) and control panel (8), its characterized in that: the output of central processing module (1) is connected to the input of control panel (8), signal acquisition module (4) are installed to the input of central processing module (1), variable frequency power supply module (3) are installed to the output of power input module (2), earthing pole (7) is connected in variable frequency power supply module (3), communication module (5) are installed to the output of central processing module (1), the end-to-end connection of communication module (5) has PC host computer (6).
2. The system of claim 1, wherein: be provided with current utmost point, first voltage utmost point, second voltage utmost point, ground connection net utmost point and earthing pole (7) on the antetheca of control panel (8), the current utmost point is connected with the current line, through the electric current line connection electric current stake, first voltage utmost point is connected with first voltage line, connects first voltage stake through first voltage line, the second voltage utmost point is connected with the second voltage line, connects second voltage stake through the second voltage line, ground connection net utmost point and downlead line connection connect the ground net through the downlead, earthing pole (7) ground connection.
3. The system for accurately measuring the ground grid of the operating substation according to any one of claims 1 and 2, is characterized in that: still be provided with switch, power socket, communication interface, display and the button district that charges on control panel (8), switch and power socket electric connection power input module (2) that charges, the display passes through signal connection central processing module (1).
4. The system of claim 2, wherein: the signal acquisition module (4) is respectively and correspondingly connected with the current pole and the two voltage poles.
5. The system of claim 1, wherein: the signal acquisition module (4) is arranged for an AD sampling circuit, and a filtering module is arranged in the signal acquisition module (4).
6. The system of claim 1, wherein: the power output end of the power input module (2) is connected with the power port of the central processing module (1), the power input module (2) is sequentially connected with the loop resistance module, the test resistance module and the standard resistance module, one end of the loop resistance module is connected with one end of the power input module (2), the other end of the loop resistance module is connected with one end of the test resistance module, the other end of the test resistance module is connected with one end of the standard resistance module, and the other end of the standard resistance module is connected with the input end of the central processing module (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921541307.7U CN211426639U (en) | 2019-09-17 | 2019-09-17 | Accurate measurement system for ground grid of operating transformer substation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921541307.7U CN211426639U (en) | 2019-09-17 | 2019-09-17 | Accurate measurement system for ground grid of operating transformer substation |
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| CN211426639U true CN211426639U (en) | 2020-09-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112698106A (en) * | 2020-12-02 | 2021-04-23 | 国网辽宁省电力有限公司锦州供电公司 | Grounding impedance testing device and method |
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2019
- 2019-09-17 CN CN201921541307.7U patent/CN211426639U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112698106A (en) * | 2020-12-02 | 2021-04-23 | 国网辽宁省电力有限公司锦州供电公司 | Grounding impedance testing device and method |
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