CN103487713A - Multipoint earthing trouble shooting equipment for substation voltage transformer secondary circuit - Google Patents
Multipoint earthing trouble shooting equipment for substation voltage transformer secondary circuit Download PDFInfo
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- CN103487713A CN103487713A CN201310435583.6A CN201310435583A CN103487713A CN 103487713 A CN103487713 A CN 103487713A CN 201310435583 A CN201310435583 A CN 201310435583A CN 103487713 A CN103487713 A CN 103487713A
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Abstract
The invention discloses multipoint earthing trouble shooting equipment for a substation voltage transformer secondary circuit. The multipoint earthing trouble shooting equipment comprises a processor, a display module and at least one pincerlike current transformer. The output end of the pincerlike current transformer is sequentially connected with a signal processing circuit and an analog-digital converter, the output end of the analog-digital converter is connected with a first input end of the processor, and a first output end of the processor is connected with the input end of the display module. According to the multipoint earthing trouble shooting equipment, specific positions where multipoint earthing faults occur in the substation voltage transformer secondary circuit can be quickly and accurately found out, thus a safe and effective finding means for multipoint earthing faults in the voltage transformer secondary circuit can be provided for multiple power generation and power supply enterprises, and safety and stability of an electric system are greatly improved. The multipoint earthing trouble shooting equipment is widely used for the field of fault detection of direct current systems.
Description
Technical field
The present invention relates to the fault detect field of straight-flow system, relate in particular to a kind of troubleshooting equipment for transformer substation voltage transformer secondary circuit multipoint earthing.
Background technology
According to " relay protection of power system and automatic safety device anti-accident measures main points ", stipulate known; several groups of Secondary Circuit of Potential Transformers that zero mutually little bus (N600) is communicated with through pulpit; it should be in pulpit by the N600 one point earth; if described Secondary Circuit of Potential Transformer exists or multipoint earthing at 2; the voltage of measuring so will be affected; and can make measurement inaccurate in serious situation, cause the malfunction of protective device.Therefore, people should work out as early as possible a kind ofly can judge whether Secondary Circuit of Potential Transformer exists multipoint earth faults fast, and the equipment of searching that can identify rapidly the loop that has multipoint earthing.
Summary of the invention
In order to solve the problems of the technologies described above, the purpose of this invention is to provide a kind of troubleshooting equipment for transformer substation voltage transformer secondary circuit multipoint earthing.
The technical solution adopted in the present invention is: transformer substation voltage transformer secondary circuit multipoint earth faults is searched equipment, it comprises processor, display module and at least one split core type current transformer, the output terminal of described split core type current transformer is connected with signal processing circuit and analog to digital converter in turn, the output terminal of described analog to digital converter is connected with the first input end of processor, and the first output terminal of described processor is connected with the input end of display module.
Further, described signal processing circuit comprises the two-stage calculation amplifying circuit, and the output terminal of described split core type current transformer passes through the two-stage calculation amplifying circuit and then is connected with the input end of analog to digital converter.
Further, described two-stage calculation amplifying circuit comprises the first operational amplifier, the second operational amplifier, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity and the 4th electric capacity;
One end of described the first resistance is connected with the negative input end of the first operational amplifier, the other end ground connection of described the first resistance, one termination of described the second resistance enters the first reference voltage, the other end of described the second resistance is connected with an end of the 3rd resistance with the positive input terminal of the first operational amplifier respectively, the other end ground connection of described the 3rd resistance, after being connected with the first Capacitance parallel connection, described the 4th resistance forms the first parallel circuit, one end of described the first parallel circuit is connected with the negative input end of the first operational amplifier, the other end of described the first parallel circuit is connected with the output terminal of the first operational amplifier and an end of the second electric capacity respectively, and described the 5th resistance is connected between the negative input end of the other end of the second electric capacity and the second operational amplifier,
After being connected with the 3rd Capacitance parallel connection, described the 6th resistance forms the second parallel circuit, one end of described the second parallel circuit is connected with the negative input end of the second operational amplifier, the other end of described the second parallel circuit is connected with an end of the 7th resistance with the output terminal of the second operational amplifier respectively, the other end of described the 7th resistance is connected with an end of the 4th electric capacity, the other end ground connection of described the 4th electric capacity, the positive input terminal of described the second operational amplifier accesses the second reference voltage;
The two ends of described the first resistance are as the input end of two-stage calculation amplifying circuit, and the two ends of described the 4th electric capacity are as the output terminal of two-stage calculation amplifying circuit.
Further, described the first operational amplifier and the second operational amplifier are all to adopt the operational amplifier chip that model is LM332 to realize.
Further, it also comprises keyboard, and the output terminal of described keyboard is connected with the second input end of processor.
Further, it also comprises memory module, and described memory module is connected with processor.
Further, it also comprises power module, and described power module is respectively analog to digital converter and processor power supply.
Further, it also comprises power management module, and the second output terminal of described processor passes through power management module and then is connected with the input end of power module.
Further, described processor is to adopt the processor chips that model is STM32F103ZE to realize.
Further, described display module is the Double liquid crystal display module, and described Double liquid crystal display module is to adopt the liquid crystal display that two models are LM240160GFW to realize.
The invention has the beneficial effects as follows: the application of the invention, just can be fast and find out exactly in the transformer substation voltage transformer secondary circuit specified place that multipoint earth faults occurs, and simple, convenient and practical and safe and effective, thereby can provide the means of searching of safety and effective Secondary Circuit of Potential Transformer multipoint earth faults for vast generating, power supply enterprise, greatly improve the safety and stability of electric system.
The accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
Fig. 1 is the structured flowchart that transformer substation voltage transformer secondary circuit multipoint earth faults of the present invention is searched equipment;
Fig. 2 is the concrete enforcement structured flowchart that transformer substation voltage transformer secondary circuit multipoint earth faults of the present invention is searched signal processing circuit in equipment;
Fig. 3 is the application principle figure of operational instances of the present invention;
Fig. 4 is the first exemplary plot of display waveform of the present invention and data;
Fig. 5 is the second exemplary plot of display waveform of the present invention and data.
Embodiment
As shown in Figure 1, transformer substation voltage transformer secondary circuit multipoint earth faults is searched equipment, it comprises processor, display module and at least one split core type current transformer, the output terminal of described split core type current transformer is connected with signal processing circuit and analog to digital converter in turn, the output terminal of described analog to digital converter is connected with the first input end of processor, and the first output terminal of described processor is connected with the input end of display module.The number of described split core type current transformer can arrange according to actual conditions, is generally 1 to 4 split core type current transformer.When the number of split core type current transformer, while being a plurality of, the output terminal of a plurality of split core type current transformers is all with the input end of signal processing circuit, to be connected.
According to above-mentioned the present invention, its principle of work is: when detecting transformer substation voltage transformer secondary circuit multipoint earth faults, utilize split core type current transformer to vise the ground wire in the Secondary Circuit of Potential Transformer that will detect, then, the present invention just can start to detect current signal and display waveform and the amplitude in current ground wire automatically.Due to, when multipoint earth faults not occurring, the waveform of two ends of same group of line should be basic the same with numerical value, therefore, when the waveform of two ends of same group of line and numerical value differ greatly, mean in Secondary Circuit of Potential Transformer to have occurred the fault of multipoint earthing.
Be further used as preferred embodiment, described signal processing circuit comprises the two-stage calculation amplifying circuit, and the output terminal of described split core type current transformer passes through the two-stage calculation amplifying circuit and then is connected with the input end of analog to digital converter.
As shown in Figure 2, described two-stage calculation amplifying circuit comprises the first operational amplifier, the second operational amplifier, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3 and the 4th capacitor C 4;
One end of described the first resistance R 1 is connected with the negative input end of the first operational amplifier, the other end ground connection of described the first resistance R 1, one termination of described the second resistance R 2 enters the first reference voltage, the other end of described the second resistance R 2 is connected with an end of the 3rd resistance R 3 with the positive input terminal of the first operational amplifier respectively, the other end ground connection of described the 3rd resistance R 3, described the 4th resistance R 4 and the first capacitor C 1 rear composition the first parallel circuit that is connected in parallel, one end of described the first parallel circuit is connected with the negative input end of the first operational amplifier, the other end of described the first parallel circuit is connected with an end of the second capacitor C 2 with the output terminal of the first operational amplifier respectively, and described the 5th resistance R 5 is connected between the negative input end of the other end of the second capacitor C 2 and the second operational amplifier,
Described the 6th resistance R 6 and the 3rd capacitor C 3 rear composition the second parallel circuit that is connected in parallel, one end of described the second parallel circuit is connected with the negative input end of the second operational amplifier, the other end of described the second parallel circuit is connected with an end of the 7th resistance R 7 with the output terminal of the second operational amplifier respectively, the other end of described the 7th resistance R 7 is connected with an end of the 4th capacitor C 4, the other end ground connection of described the 4th capacitor C 4, the positive input terminal of described the second operational amplifier accesses the second reference voltage;
The two ends of described the first resistance R 1 are as the input end of two-stage calculation amplifying circuit, and the two ends of described the 4th capacitor C 4 are as the output terminal of two-stage calculation amplifying circuit.
Be further used as preferred embodiment, described the first operational amplifier and the second operational amplifier are all to adopt the operational amplifier chip that model is LM332 to realize.
Be further used as preferred embodiment, it also comprises keyboard, and the output terminal of described keyboard is connected with the second input end of processor.
Be further used as preferred embodiment, it also comprises memory module, and described memory module is connected with processor.Described memory module can be SDRAM memory module, FLASH memory module or USB flash disk.And, because the present invention is provided with memory module, therefore can deposit the waveform and the data that detect in memory module, and will be stored in waveform and data reading in memory module in needs.
Be further used as preferred embodiment, it also comprises power module, and described power module is respectively analog to digital converter and processor power supply.
Be further used as preferred embodiment, it also comprises power management module, and the second output terminal of described processor passes through power management module and then is connected with the input end of power module.
Be further used as preferred embodiment, described processor is to adopt the processor chips that model is STM32F103ZE to realize.
Be further used as preferred embodiment, described display module is the Double liquid crystal display module, and described Double liquid crystal display module is to adopt the liquid crystal display that two models are LM240160GFW to realize.
Operational instances of the present invention
1, as shown in Figure 3, ground wire PT1(the first voltage transformer (VT)) only has two kinds of electric currents: the first, the current signal that each phase unbalance voltage and phase place cause; The second, Ic, Ic is the capacitance current that cable screening wire or other reason cause, and described electric capacity is very little, so Ic is very little, and I4 and I5 that the present invention measures are also very little.
2, suppose as shown in Figure 3, at PT2(second voltage mutual inductor) ground wire on the point of an imaginary ground connection is arranged, between two ground, some distances are arranged, epd causes having electric current I to produce.
3, utilize 4 split core type current transformers to vise the ground wire of PT2, then the I3 place detected a larger current signal is arranged, then along current signal, toward the PT2 terminal, search, being found to I2 place current signal exists, and disappear to I1 place current signal, therefore can determine that the point that earth fault occurs is present in I1 between the I2 place.
4, the waveform of the current signal at I3 place and data show as shown in Figure 4, and this waveform and data can be stored to USB flash disk after utilizing keyboard by storage key.
5, demonstration is as shown in Figure 5 from USB flash disk is read for the waveform of the current signal at I3 place and data.
By above-mentioned known, the present invention can search the situation that there is multipoint earthing in Secondary Circuit of Potential Transformer rapidly and accurately, thereby, the application of the invention can improve the performance of power system stability operation, and in the process of searching at multipoint earthing without with system under test (SUT), electrical connection being arranged, convenient operation, safe.
More than that better enforcement of the present invention is illustrated, but the invention is not limited to described embodiment, those of ordinary skill in the art also can do and make all equivalent variations or replacement under the prerequisite without prejudice to spirit of the present invention, and the distortion that these are equal to or replacement all are included in the application's claim limited range.
Claims (10)
1. transformer substation voltage transformer secondary circuit multipoint earth faults is searched equipment, it is characterized in that: it comprises processor, display module and at least one split core type current transformer, the output terminal of described split core type current transformer is connected with signal processing circuit and analog to digital converter in turn, the output terminal of described analog to digital converter is connected with the first input end of processor, and the first output terminal of described processor is connected with the input end of display module.
2. transformer substation voltage transformer secondary circuit multipoint earth faults according to claim 1 is searched equipment, it is characterized in that: described signal processing circuit comprises the two-stage calculation amplifying circuit, and the output terminal of described split core type current transformer passes through the two-stage calculation amplifying circuit and then is connected with the input end of analog to digital converter.
3. transformer substation voltage transformer secondary circuit multipoint earth faults according to claim 2 is searched equipment, it is characterized in that: described two-stage calculation amplifying circuit comprises the first operational amplifier, the second operational amplifier, the first resistance (R1), the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), the 5th resistance (R5), the 6th resistance (R6), the 7th resistance (R7), the first electric capacity (C1), the second electric capacity (C2), the 3rd electric capacity (C3) and the 4th electric capacity (C4);
One end of described the first resistance (R1) is connected with the negative input end of the first operational amplifier, the other end ground connection of described the first resistance (R1), one termination of described the second resistance (R2) enters the first reference voltage, the other end of described the second resistance (R2) is connected with an end of the 3rd resistance (R3) with the positive input terminal of the first operational amplifier respectively, the other end ground connection of described the 3rd resistance (R3), described the 4th resistance (R4) and the first electric capacity (C1) rear composition the first parallel circuit that is connected in parallel, one end of described the first parallel circuit is connected with the negative input end of the first operational amplifier, the other end of described the first parallel circuit is connected with an end of the second electric capacity (C2) with the output terminal of the first operational amplifier respectively, and described the 5th resistance (R5) is connected between the negative input end of the other end of the second electric capacity (C2) and the second operational amplifier,
Described the 6th resistance (R6) and the 3rd electric capacity (C3) rear composition the second parallel circuit that is connected in parallel, one end of described the second parallel circuit is connected with the negative input end of the second operational amplifier, the other end of described the second parallel circuit is connected with an end of the 7th resistance (R7) with the output terminal of the second operational amplifier respectively, the other end of described the 7th resistance (R7) is connected with an end of the 4th electric capacity (C4), the other end ground connection of described the 4th electric capacity (C4), the positive input terminal of described the second operational amplifier accesses the second reference voltage;
The two ends of described the first resistance (R1) are as the input end of two-stage calculation amplifying circuit, and the two ends of described the 4th electric capacity (C4) are as the output terminal of two-stage calculation amplifying circuit.
4. transformer substation voltage transformer secondary circuit multipoint earth faults according to claim 3 is searched equipment, it is characterized in that: described the first operational amplifier and the second operational amplifier are all to adopt the operational amplifier chip that model is LM332 to realize.
5. transformer substation voltage transformer secondary circuit multipoint earth faults according to claim 1 is searched equipment, and it is characterized in that: it also comprises keyboard, and the output terminal of described keyboard is connected with the second input end of processor.
6. transformer substation voltage transformer secondary circuit multipoint earth faults according to claim 1 is searched equipment, and it is characterized in that: it also comprises memory module, and described memory module is connected with processor.
7. transformer substation voltage transformer secondary circuit multipoint earth faults according to claim 1 is searched equipment, and it is characterized in that: it also comprises power module, and described power module is respectively analog to digital converter and processor power supply.
8. transformer substation voltage transformer secondary circuit multipoint earth faults according to claim 7 is searched equipment, it is characterized in that: it also comprises power management module, and the second output terminal of described processor passes through power management module and then is connected with the input end of power module.
9. transformer substation voltage transformer secondary circuit multipoint earth faults according to claim 1 is searched equipment, it is characterized in that: described processor is to adopt the processor chips that model is STM32F103ZE to realize.
10. transformer substation voltage transformer secondary circuit multipoint earth faults according to claim 1 is searched equipment, it is characterized in that: described display module is the Double liquid crystal display module, and described Double liquid crystal display module is to adopt the liquid crystal display that two models are LM240160GFW to realize.
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| CN201310435583.6A CN103487713A (en) | 2013-09-23 | 2013-09-23 | Multipoint earthing trouble shooting equipment for substation voltage transformer secondary circuit |
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| CN201310435583.6A CN103487713A (en) | 2013-09-23 | 2013-09-23 | Multipoint earthing trouble shooting equipment for substation voltage transformer secondary circuit |
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Cited By (6)
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| CN104237739A (en) * | 2014-09-11 | 2014-12-24 | 深圳供电局有限公司 | Multipoint earth fault detection method, device and system for secondary current circuit |
| CN106370925A (en) * | 2016-10-27 | 2017-02-01 | 深圳市中鹏电子有限公司 | Lightning energy calculation circuit based on FPGA |
| CN106501670A (en) * | 2016-09-26 | 2017-03-15 | 国家电网公司 | Electric power underground line leak current fault surveys quasi- instrument |
| CN107728051A (en) * | 2017-10-09 | 2018-02-23 | 瑞熙恩电气（珠海）有限公司 | Method of testing, test device and the switch cabinet system of secondary control device |
| CN113238171A (en) * | 2021-05-13 | 2021-08-10 | 贵州电网有限责任公司 | Remote and rapid positioning and judging method for electric secondary circuit fault |
| CN113945859A (en) * | 2021-09-08 | 2022-01-18 | 广西电网有限责任公司防城港供电局 | CT secondary side multipoint grounding searching instrument based on current comparison method |
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| CN106370925A (en) * | 2016-10-27 | 2017-02-01 | 深圳市中鹏电子有限公司 | Lightning energy calculation circuit based on FPGA |
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| CN107728051B (en) * | 2017-10-09 | 2023-08-18 | 瑞熙恩电气（珠海）有限公司 | Test method and test device for secondary control device and switch cabinet system |
| CN113238171A (en) * | 2021-05-13 | 2021-08-10 | 贵州电网有限责任公司 | Remote and rapid positioning and judging method for electric secondary circuit fault |
| CN113945859A (en) * | 2021-09-08 | 2022-01-18 | 广西电网有限责任公司防城港供电局 | CT secondary side multipoint grounding searching instrument based on current comparison method |
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Application publication date: 20140101 |