CN203037810U - A microcomputer DC insulation monitoring and line selecting device - Google Patents
A microcomputer DC insulation monitoring and line selecting device Download PDFInfo
- Publication number
- CN203037810U CN203037810U CN 201320069228 CN201320069228U CN203037810U CN 203037810 U CN203037810 U CN 203037810U CN 201320069228 CN201320069228 CN 201320069228 CN 201320069228 U CN201320069228 U CN 201320069228U CN 203037810 U CN203037810 U CN 203037810U
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- Prior art keywords
- bus
- circuit
- alarm
- insulation
- microcomputer
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- Expired - Fee Related
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- 238000009413 insulation Methods 0.000 title claims abstract description 18
- 230000000875 corresponding Effects 0.000 claims abstract description 4
- 238000002955 isolation Methods 0.000 claims description 11
- 239000004973 liquid crystal related substance Substances 0.000 abstract 2
- 230000001702 transmitter Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001681 protective Effects 0.000 description 1
- 230000001131 transforming Effects 0.000 description 1
Abstract
The utility model relates to a microcomputer DC insulation monitoring and line selecting device comprising a main machine box. A bus voltage detecting circuit, a bus insulation detecting circuit, an input selecting circuit, A/D converters, and a master controller are mounted in the main machine box. A liquid crystal display screen, a keyboard, and an alarm are disposed on the front panel of the main machine box. A 485 bus interface is disposed on the backboard of the main machine box. Current transmitters are mounted on DC loads and are connected with the input selecting circuit. The bus voltage detecting circuit, the bus insulation detecting circuit, and the input selecting circuit are connected with corresponding A/D converters which are connected with the master controller. The master controller is connected with the liquid crystal display screen, the keyboard, and the alarm. The microcomputer DC insulation monitoring and line selecting device is capable of online monitoring the bus voltage and the insulation resistance value against ground of a DC system in real time, timely giving an alarm when faults generate, and automatically determining a grounding subcircuit while the DC system not powered off.
Description
One, technical field:
The utility model relates to electric system direct current safety monitor facility, what be specifically related to is a kind of microcomputer type D.C. isolation supervision and line selection apparatus.
Two, background technology:
The straight-flow system of generating plant and transformer station is the working power of control system and signal system, relay protection aut.eq., and the functional reliability of straight-flow system directly influences the safety of electric system.But DC loop is of a great variety, branch line in length and breadth, the probability that ground connection is taken place is very high.Under the normal condition, the positive and negative busbar of straight-flow system is to float sky over the ground.Though when straight-flow system generation one point earth, can not influence operate as normal, when second earth point occurring, might cause accident.Therefore must get rid of earth fault immediately.
Yet the grounding fault of straight-flow system but is a stubborn problem.Traditional method is to disconnect each branch road by the road, determines fault branch according to the indication of insulating monitoring device, searches step by step along this branch road then, determines earth point at last.This method extremely wastes time and energy, and when disconnecting a certain branch road, the control on this branch road and protective device will withdraw from short-term, at this moment might cause accident.
Traditional D.C. isolation supervisory device exists can't chargedly search fault branch and problem that can't automatic route selection when straight-flow system generation earth fault in sum.
Three, summary of the invention:
The purpose of this utility model provides the supervision of a kind of microcomputer type D.C. isolation and line selection apparatus, can't chargedly search fault branch and problem that can't automatic route selection when this microcomputer type D.C. isolation supervision and line selection apparatus are used for solving the generation earth fault that existing D.C. isolation supervisory device exists.
The technical scheme that its technical matters that solves the utility model adopts is: this microcomputer type D.C. isolation supervision and line selection apparatus comprise mainframe box, busbar voltage testing circuit, bus insulation testing circuit, input selection circuit, A/D converter, primary controller are installed in the mainframe box, LCDs, keyboard, alarm are set on the front panel of mainframe box, 485 bus interface are set on the backboard of mainframe box, and current transducer is installed on the dc load and with input selection circuit and is connected; Busbar voltage testing circuit, bus insulation testing circuit, input selection circuit all are connected with corresponding A/D converter, and each A/D converter all is connected with primary controller, and primary controller connects LCDs, keyboard, alarm respectively.
Mini-printer also is set on the front panel of mainframe box in the such scheme, and primary controller connects mini-printer.
Beneficial effect:
(1) but the insulation status of the utility model on-line real time monitoring straight-flow system.In case the stake resistance of system is lower than predefined alarming value, then report to the police automatically, device enters the route selection state afterwards, shows and prints ground connection branch road number.
(2) but the utility model on-line real time monitoring and show the busbar voltage of straight-flow system.In case the busbar voltage of system exceeds predefined scope, then report to the police automatically.
(3) the utility model need not have a power failure to look into and looks for the ground connection branch road automatically.Under the bigger situation of multipoint earthing and system's ground capacitance, still have higher accuracy.
Four, description of drawings:
Fig. 1 is structural representation of the present utility model;
Fig. 2 is theory diagram of the present utility model.
1 mainframe box, 2 LCDs, 3 keyboards, 4 alarms, 5 mini-printers, 6 current transducers.
Five, embodiment:
Below in conjunction with accompanying drawing the utility model is described further:
As shown in Figure 1, this microcomputer type D.C. isolation supervision and line selection apparatus comprise mainframe box 1, busbar voltage testing circuit, bus insulation testing circuit, input selection circuit, A/D converter, primary controller are installed in the mainframe box 1, LCDs 2, keyboard 3, alarm 4, mini-printer 5 are set on the front panel of mainframe box 1,485 bus interface are set on the backboard of mainframe box 1, current transducer 6 is installed on the dc load and with input selection circuit and is connected, and the number of current transducer 6 can need to arrange according to the scene; Busbar voltage testing circuit, bus insulation testing circuit, input selection circuit all are connected with corresponding A/D converter, each A/D converter all is connected with primary controller, primary controller connects LCDs 2, keyboard 3, alarm 4 respectively, can realize input and the output of signal like this, wherein the signal of input selection circuit is from the current transducer that is connected on the dc load, and busbar voltage testing circuit and bus insulation testing circuit are connected respectively on the bus.The model of primary controller is TMS320LF2407, and busbar voltage testing circuit, bus insulation testing circuit, input selection circuit are known circuits.
The utility model can be connected with higher level's supervising device by 485 bus interface, to realize the strange land monitoring.
The utility model can be realized when straight-flow system was normally moved:
1) real time monitoring and show DC bus-bar voltage, error≤± 1%(in 90%～130% scope of rated voltage, error≤± 0.5%);
2) real time monitoring and demonstration dc bus insulation against ground resistance, measurement range: 0～999k Ω, error≤± (5% ± 2k Ω); And has an online function of patrolling and examining each branch road insulation status of direct current.
The utility model course of work was as follows when earth fault appearred in straight-flow system:
1) demonstration and the positive and negative busbar voltage of record direct current, busbar grounding resistance and time of origin.
2) warning of sounding is simultaneously with 1) be sent to higher level's supervising device with the form of message by 485 buses.Meanwhile begin to select automatically faulty line.
3) after route selection finishes, show and record ground connection branch number, polarity, stake resistance (or leakage current) and time of origin, and be sent to higher level's supervising device with the form of message by 485 buses.
Can print 1 on the spot by mini-printer 5 in addition) and 3) middle message content, also functions such as various parameters and realization the inquiry of historical data can be set by keyboard 3.
To sum up, the utility model adopts modern microelectric technique, can realize the real time on-line monitoring to busbar voltage and the insulation against ground resistance value of straight-flow system, can in time report to the police when breaking down and automatically definite ground connection branch road under the situation of not cutting off the power supply, and the route selection result can be generated message shows and storage on LCDs automatically, improved the security of generating plant and transforming station direct current system, saved recondition expense, increased work efficiency.
Claims (2)
1. a microcomputer type D.C. isolation is supervised and line selection apparatus, it is characterized in that: this microcomputer type D.C. isolation supervision and line selection apparatus comprise mainframe box (1), busbar voltage testing circuit, bus insulation testing circuit, input selection circuit, A/D converter, primary controller are installed in the mainframe box (1), LCDs (2), keyboard (3), alarm (4) are set on the front panel of mainframe box (1), on the backboard of mainframe box (1) 485 bus interface are set, current transducer (6) is installed on the dc load and with input selection circuit and is connected; Busbar voltage testing circuit, bus insulation testing circuit, input selection circuit all are connected with corresponding A/D converter, and each A/D converter connects and all is connected with primary controller, and primary controller connects LCDs (2), keyboard (3), alarm (4) respectively.
2. microcomputer type D.C. isolation supervision according to claim 1 and line selection apparatus is characterized in that: mini-printer (5) also is set, primary controller connection mini-printer (5) on the front panel of described mainframe box (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320069228 CN203037810U (en) | 2013-02-06 | 2013-02-06 | A microcomputer DC insulation monitoring and line selecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320069228 CN203037810U (en) | 2013-02-06 | 2013-02-06 | A microcomputer DC insulation monitoring and line selecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203037810U true CN203037810U (en) | 2013-07-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320069228 Expired - Fee Related CN203037810U (en) | 2013-02-06 | 2013-02-06 | A microcomputer DC insulation monitoring and line selecting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203037810U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106154108A (en) * | 2015-04-27 | 2016-11-23 | 鞍钢股份有限公司 | The finding circuit of a kind of line selection apparatus and method |
-
2013
- 2013-02-06 CN CN 201320069228 patent/CN203037810U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106154108A (en) * | 2015-04-27 | 2016-11-23 | 鞍钢股份有限公司 | The finding circuit of a kind of line selection apparatus and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130703 Termination date: 20150206 |
|
| EXPY | Termination of patent right or utility model |