CN203310954U - Voltage insulation-monitoring line-selection device for direct-current system - Google Patents
Voltage insulation-monitoring line-selection device for direct-current system Download PDFInfo
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- CN203310954U CN203310954U CN2013202975914U CN201320297591U CN203310954U CN 203310954 U CN203310954 U CN 203310954U CN 2013202975914 U CN2013202975914 U CN 2013202975914U CN 201320297591 U CN201320297591 U CN 201320297591U CN 203310954 U CN203310954 U CN 203310954U
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Abstract
The utility model discloses a voltage insulation-monitoring line-selection device for a direct-current system. Comparing with the prior art, the utility model remedies a defect that a circuit branch has to be disconnected for looking for a ground fault during ground fault detection, and time and labor are wasted. The device provided by the utility model comprises a voltage transformer, a main filter, a digital-analog converter, a voltage alarm, and a main processing chip. The voltage transformer is connected with the digital-analog converter through the main filter. The digital-analog converter is connected with the main processing chip. The voltage alarm is connected with the main processing chip. The device provided by the utility model can quickly and accurately find a specific ground point and the position where insulation is damaged. There is no need cutting off electricity for looking for a ground circuit branch and a go circuit where the insulation is damaged. Meanwhile, a busbar voltage of the direct-current system can be monitored and displayed on line in real time. The device is still higher in accuracy in the conditions of multi-point grounding and higher capacitance of the system to the ground.
Description
Technical field
The utility model relates to the insulating monitoring technical field, is a kind of straight-flow system voltage insulation monitoring line selection apparatus specifically.
Background technology
The straight-flow system of generating plant and transformer station is the working power of control system, signal system and protective relaying device, and the functional reliability of straight-flow system directly affects the safety of electric system.But DC loop is of a great variety, branch line in length and breadth, the probability that ground connection occurs is very high.Under normal circumstances, the positive and negative busbar of straight-flow system is to float over the ground sky.Though can not affect normal operation when straight-flow system generation one point earth, when second earth point occurring, will likely cause accident, therefore must get rid of immediately earth fault.The grounding fault of existing straight-flow system is very difficult, waste time and energy, and must disconnect each branch road by road, then according to the indication of insulating monitor, determines fault branch, then searches step by step along this branch road, finally definite earth point.Particularly when disconnecting a certain branch road, the control on this branch road and protective device will exit in short-term, at this moment likely cause again other accidents.How to develop a kind of easy to use, can be in the situation that the monitoring device of automatically determining the ground connection outlet that do not cut off the power supply have become urgent problem.
The utility model content
The purpose of this utility model is the defect of must disconnected branches searching, wasting time and energy in order to solve Earth Fault Detection in prior art, provides a kind of straight-flow system voltage insulation monitoring line selection apparatus to solve the problems referred to above.
To achieve these goals, the technical solution of the utility model is as follows:
Straight-flow system voltage insulation monitoring line selection apparatus, comprise voltage transformer (VT), senior filter, digital to analog converter, voltage alarms based on pattern recognition and main process chip, described voltage transformer (VT) is connected with digital to analog converter by senior filter, described digital to analog converter is connected with main process chip, and described voltage alarms based on pattern recognition is connected with main process chip.
Also comprise current transformer and from wave filter, described current transformer is by being connected with digital to analog converter from wave filter.
Also comprise loop sensor, multi-way switch, filter amplifier and ground alarm, described loop sensor is connected with filter amplifier by multi-way switch, described filter amplifier is connected with digital to analog converter, and described ground alarm is connected with main process chip.
Between described voltage transformer (VT) and senior filter, be connected with main isolator, described current transformer and being connected with from isolator between wave filter.
Beneficial effect
A kind of straight-flow system voltage insulation monitoring line selection apparatus of the present utility model, compared with prior art can find out the position that concrete earth point and insulation sustain damage quickly and accurately, do not need to have a power failure and can carry out searching of ground connection branch road and the impaired outlet of insulation.Simultaneously can on-line real time monitoring and show the busbar voltage of straight-flow system, in the situation that multipoint earthing and system ground capacitance are larger, still have higher accuracy.
The accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Wherein: 1-master's process chip, 2-digital to analog converter, 3-voltage transformer (VT), 4-current transformer, 5-master's isolator, 6-senior filter, 7-are from isolator, 8-from wave filter, 9-loop sensor, the beginning of 10-multichannel, 11-filter amplifier, 12-liquid crystal display, 13-printer, 14-keyboard, 15-clock, 16-serial communication interface, 17-voltage alarms based on pattern recognition, 18-ground alarm.
Fig. 2 is the scheme of installation of the utility model loop sensor
Wherein, 9-loop sensor, 19-load, 20-mounting bracket.
Embodiment
For making that architectural feature of the present utility model and the effect reached are had a better understanding and awareness, in order to preferred embodiment and accompanying drawing, coordinate detailed explanation, be described as follows:
As shown in Figure 1, a kind of straight-flow system voltage insulation monitoring line selection apparatus described in the utility model, comprise voltage transformer (VT) 3, senior filter 6, digital to analog converter 2, voltage alarms based on pattern recognition 17 and main process chip 1, described voltage transformer (VT) 3 is connected with digital to analog converter 2 by senior filter 6, described digital to analog converter 2 is connected with main process chip 1, and described voltage alarms based on pattern recognition 17 is connected with main process chip 1.So just, can complete the monitoring of bus voltage signal, according to prior setting value in main process chip 1, if bus voltage signal, higher than setting value, is reported to the police by voltage alarms based on pattern recognition 17.The conversion that digital to analog converter 2 carries out between simulating signal and digital signal, 6 pairs of signals of senior filter purify, and prevent that undesired signal from affecting the data acquisition result.Also comprise current transformer 4 and from wave filter 8, described current transformer 4 is by being connected with digital to analog converter 2 from wave filter 8.By current transformer 4, can gather the leakage current of bus and the signal source voltage that signal generator produces.Also comprise loop sensor 9, multi-way switch 10, filter amplifier 11 and ground alarm 18, described loop sensor 9 is connected with filter amplifier 11 by multi-way switch 10, described filter amplifier 11 is connected with digital to analog converter 2, described ground alarm 18 is connected with main process chip 1, thereby realizes searching earth fault in the situation that do not cut off the power supply.As shown in Figure 2, loop sensor 9, for to be installed on each sensor in many loops, is arranged on each branch line by mounting bracket 20, under connect load 19, thereby gather branch road information.Better effects if be between voltage transformer (VT) 3 and senior filter 6, to be connected main isolator 5, described current transformer 4 with between wave filter 8, being connected from isolator 7, main isolator 5 and be all the effect of playing isolation signals from isolator 7, better guaranteed anti-interference.The external liquid crystal display 12 of main process chip 1, printer 13, keyboard 14, clock 15, serial communication interface 16, used for man-machine interaction.
During actual the use, collect voltage signal by voltage transformer (VT) 3, and after isolator and wave filter, be input to digital to analog converter 2 by the leakage current of current transformer 4 collection buses and the signal source voltage of signal generator generation.The leakage current signal of the sensor collection by each loop also is input to digital to analog converter 2 simultaneously through multi-way switch 10 and filter amplifier 11.After being input to main process chip 1, digital to analog converter 2 deal with data judge whether system insulation is impaired, and impaired concrete loop.Main process chip is carried out size relatively to the capacitance current in every loop, and maximum be fault loop, if the capacitance current in every loop sustains damage for fault loop or insulation with the capacitance current increase in this loop.If a phase voltage of system voltage reduces, what two phase electricity voltage rise height reduced in addition one is fault phase mutually, if three-phase all raises, wherein one relatively rise lower, this insulate and sustains damage mutually.Operation result is delivered to backstage by serial communication interface, on liquid crystal display, shows simultaneously, and sends alerting signal.
Above demonstration and described ultimate principle of the present utility model, principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; what in above-described embodiment and instructions, describe is principle of the present utility model; the utility model also has various changes and modifications under the prerequisite that does not break away from the utility model spirit and scope, and these changes and improvements all fall in claimed scope of the present utility model.The protection domain that the utility model requires is defined by appending claims and equivalent thereof.
Claims (4)
1. a straight-flow system voltage insulation is monitored line selection apparatus, it is characterized in that: comprise voltage transformer (VT) (3), senior filter (6), digital to analog converter (2), voltage alarms based on pattern recognition (17) and main process chip (1), described voltage transformer (VT) (3) is connected with digital to analog converter (2) by senior filter (6), described digital to analog converter (2) is connected with main process chip (1), and described voltage alarms based on pattern recognition (17) is connected with main process chip (1).
2. straight-flow system voltage insulation according to claim 1 is monitored line selection apparatus, it is characterized in that: also comprise current transformer (4) and from wave filter (8), described current transformer (4) is by being connected with digital to analog converter (2) from wave filter (8).
3. straight-flow system voltage insulation according to claim 2 is monitored line selection apparatus, it is characterized in that: also comprise loop sensor (9), multi-way switch (10), filter amplifier (11) and ground alarm (18), described loop sensor (9) is connected with filter amplifier (11) by multi-way switch (10), described filter amplifier (11) is connected with digital to analog converter (2), and described ground alarm (18) is connected with main process chip (1).
4. straight-flow system voltage insulation according to claim 3 is monitored line selection apparatus, it is characterized in that: between described voltage transformer (VT) (3) and senior filter (6), be connected with main isolator (5), described current transformer (4) and being connected with from isolator (7) between wave filter (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202975914U CN203310954U (en) | 2013-05-28 | 2013-05-28 | Voltage insulation-monitoring line-selection device for direct-current system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202975914U CN203310954U (en) | 2013-05-28 | 2013-05-28 | Voltage insulation-monitoring line-selection device for direct-current system |
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| Publication Number | Publication Date |
|---|---|
| CN203310954U true CN203310954U (en) | 2013-11-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013202975914U Expired - Lifetime CN203310954U (en) | 2013-05-28 | 2013-05-28 | Voltage insulation-monitoring line-selection device for direct-current system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110346678A (en) * | 2019-07-17 | 2019-10-18 | 南京钢铁股份有限公司 | A kind of method of quick lookup direct current system multipoint earth faults |
| CN113904287A (en) * | 2021-09-30 | 2022-01-07 | 国网河南省电力公司检修公司 | Intelligent bridging device for screen top small bus |
-
2013
- 2013-05-28 CN CN2013202975914U patent/CN203310954U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110346678A (en) * | 2019-07-17 | 2019-10-18 | 南京钢铁股份有限公司 | A kind of method of quick lookup direct current system multipoint earth faults |
| CN113904287A (en) * | 2021-09-30 | 2022-01-07 | 国网河南省电力公司检修公司 | Intelligent bridging device for screen top small bus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 230601 No. 268 Furong Road, Hefei economic and Technological Development Zone, Anhui, China Patentee after: ANHUI NEW ONLINE SCIENCE AND TECHNOLOGY SHARE CO.,LTD. Address before: 230601 No. 268 Furong Road, Hefei economic and Technological Development Zone, Anhui, China Patentee before: HEFEI NEWONLINE SCIENCE & TECHNOLOGY DEVELOPMENT Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131127 |