CN200941546Y - On-line line selection protector of single-phase earthing fault - Google Patents
On-line line selection protector of single-phase earthing fault Download PDFInfo
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- CN200941546Y CN200941546Y CN 200620074963 CN200620074963U CN200941546Y CN 200941546 Y CN200941546 Y CN 200941546Y CN 200620074963 CN200620074963 CN 200620074963 CN 200620074963 U CN200620074963 U CN 200620074963U CN 200941546 Y CN200941546 Y CN 200941546Y
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Abstract
The utility model relates a single phase earthing fault online selecting line protection device. The technology scheme is that the device comprises a single chip microcomputer, an electrical capacity acquisition circuit, a power supply module, a switch signal output circuit, a LCD displayer and a RS232 communication interface. The output end of the LCD displayer and the output end of the switch signal output circuit are separately connected to I/O port of the single chip microcomputer. The output end of the electrical capacity acquisition circuit, the input end of the RS232 communication interface and the power supply module are separately connected to the A/D conversion port of the single chip microcomputer, the series port and the accessing port of the power supply. The advantage is : 1) Correct adjustment, good timeliness, which saves manpower and material for fault investigation and greatly improves working efficiency; 2)The utility model applies plug-in structure and independent enclosed case, sealing performance is good, the utility model is anti-jamming, solid and reliable, capability of anti-vibration is strong; 3) Applies corresponding movable communication interface to realize self-service automatic fault alarm and remote control.
Description
Technical field
The utility model relates to electrical protection apparatus, relates in particular to a kind of single phase grounding trouble on line wire selecting protection device.
Background technology
In when, in neutral nondirect earthing network (claiming small current neutral grounding system again) single-phase earthing taking place, because the electric current of fault point is very little, and the line voltage between the three-phase still keeps symmetry, not influence of power supply to load, therefore, all allow in the ordinary course of things to continue again to move 1-2 hour, and needn't trip immediately.But after single-phase earthing, the voltage to earth of other two-phase will raise
Doubly.In order to prevent that fault further is expanded into or multipoint earthing short circuit at 2, the operations staff will take measures to be eliminated timely.
When distribution network generation low current grounding, can't predict and take effective precautionary measures in advance, only can adopt open line method and artificial line walking ocular estimate to determine the accurate position of earth point afterwards, open line method need carry out a large amount of grid switching operations, bring very big loss to production, especially at the Production Regional of working continuously and some key equipments.And after accident takes place, also need take artificial line walking ocular estimate to seek earth point, all to expend great amount of manpower, material resources and time at every turn.The general phase-selecting method that adopts than the width of cloth of existing earth-fault protection, but be subjected to the influence of zero sequence current mutual inductor unsymmetrical current and operational mode bigger is differentiated inaccurately, and operation stability is poor.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, utilizes the fundamental power discriminating direction to improve a kind of single phase grounding trouble on line wire selecting protection device of identification faulty line accuracy and real-time, and it is realized by following technical scheme:
Comprise single-chip microcomputer, electric quantity acquisition circuit, power module, switching value output circuit, LCD display and RS232 communication interface, the output of LCD display input and switching value output circuit is connected the I/O port of single-chip microcomputer respectively, and electric quantity acquisition circuit output end, RS232 communication interface and power module input are connected with A/D conversion port, serial port, the power access end mouth of single-chip microcomputer respectively.
Described electric quantity acquisition circuit is a reverse voltage amplifier.
Described switching value output circuit has a triode Q1, its base stage B connects the I/O port of described single-chip microcomputer, and its collector electrode C connects relay J, its emitter E ground connection, rectifier diode D1 is attempted by on the relay J, and filter capacitor C1 is connected to triode Q1 output VCC.
The beneficial effects of the utility model are: 1) differentiate accurately, real-time is good, can save the required man power and material of earth fault investigation work, has improved operating efficiency greatly; 2) the utility model device adopts inserter structure, independent closed cell cabinet, and good airproof performance, anti-interference, firm reliable, the anti-vibration ability is strong; 3) adopt corresponding mobile communication interface, can realize unmanned automatic fault warning and Long-distance Control.
Description of drawings
Fig. 1 is the utility model apparatus structure schematic diagram.
Fig. 2 is the electric quantity acquisition circuit diagram.
Fig. 3 is switching value output circuit figure.
Among the figure, the 1st, electric quantity acquisition circuit diagram, the 2nd, power module, the 3rd, LCD display, the 4th, single-chip microcomputer, the 5th, RS232 communication interface, the 6th, switching value output circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described further.
Contrast Fig. 1, the single-chip microcomputer 4 in the present embodiment is selected the LPC2210 chip for use, and power module adopts JXD5-05H12, inserts the power input of single-chip microcomputer 4.Electric quantity acquisition circuit 1 is a reverse voltage amplifier, see also Fig. 2, its output OUT is connected with the A/D conversion port of single-chip microcomputer 4, and pairing 8 the electric quantity acquisition circuit 1 of 8 electric weight of required collection are connected on the A/D conversion port of P0.27～P0.34 of LPC2210 chip.8 bit data inputs of LCD display 3 are connected on the I/O port of P2.1～P2.7 of this chip.Switching value output circuit 6 sees also Fig. 3, and a triode Q1 is arranged, and base stage B connects the single-chip processor i/o port, and the base stage B of 8 triode Q1 of institute's correspondence is connected with the I/O port of the P2.1～P2.7 of LPC2210 chip respectively in 8 switching value output circuits.Collector electrode C connects relay J, emitter E ground connection, and rectifier diode D1 is attempted by on the relay J, and filter capacitor C1 is connected to triode Q1 output VCC.The RS232 communication interface is connected with the serial port P0.0～P0.1 of chip.
When individual event earth fault takes place when, the phase relation of residual voltage and zero-sequence current changes, be transformed into the analog voltage signal that single-chip microcomputer can receive by three-phase voltage and zero-sequence current through instrument transformer and operational amplifier, handle by the laggard row operation of single-chip microcomputer digital-to-analogue conversion again fault is carried out the route selection judgement, dependent failure information is delivered to LCD display and switching value output circuit through the I/O port respectively.Dependent failure information input LCD makes it show that fault takes place.The input (base stage of triode Q1) of dependent failure information input switch amount output circuit, amplify the action of rear drive relay J through triode Q1, produce switching value signal FENA, FENB, the corresponding port of this switching value signal input circuit breaker is controlled circuit breaker.Fault message also can be given GSM note cat module by RS232 serial communication interface photos and sending messages, sends note is informed earth fault to the night shift room staff generation with wireless by China Mobile.As: can send to the operator on duty of transformer station with the form of note when low current grounding takes place, also can send the data etc. of detection to the operator on duty of transformer station by some cycles.The operator on duty also can adopt and send way of short messages by sending fix command by GSM note cat module to the utility model device simultaneously, and it is realized Long-distance Control.
The utility model device adopt with note cat module GSM RS232 serial communication mode, can prevent that the interference on the communication line from entering controller.Adopt GSM note cat module with extraneous communication, can directly link China Mobile, reduce the construction cost of communication network.Have and network fast the communication reliable characteristics.
The employing fundamental power discriminating direction earth fault that the utility model device adopts.Can improve the identification accuracy and the real-time of faulty line like this, cooperate simultaneously and adopt accurate zero sequence current mutual inductor to reduce the influence of unsymmetrical current the route selection reliability.
The operating supply voltage of the utility model device is 220V A C, and positive negative error is 20%, and the zero-sequence current identification range is between 0.5A-5A.Device adopts inserter structure, independent closed cell cabinet, and good airproof performance, anti-interference, firm reliable, the anti-vibration ability is strong.
Claims (3)
1, single phase grounding trouble on line wire selecting protection device; it is characterized in that comprising single-chip microcomputer, electric quantity acquisition circuit, power module, switching value output circuit, (LCD) display and (RS232) communication interface; (LCD) output of display input and switching value output circuit is connected (I/O) port of single-chip microcomputer respectively, and electric quantity acquisition circuit output end, (RS232) communication interface and power module input are connected with (A/D) conversion port, serial port, the power access end mouth of single-chip microcomputer respectively.
2, single phase grounding trouble on line wire selecting protection device according to claim 1 is characterized in that described electric quantity acquisition circuit is a reverse voltage amplifier.
3, single phase grounding trouble on line wire selecting protection device according to claim 2; it is characterized in that described switching value output circuit has a triode (Q1); its base stage (B) connects the I/O port of described single-chip microcomputer; its collector electrode (C) connects relay (J); its emitter (E) ground connection; rectifier diode (D1) is attempted by on the relay J, and filter capacitor (C1) is connected to triode (Q1) output (VCC).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620074963 CN200941546Y (en) | 2006-07-19 | 2006-07-19 | On-line line selection protector of single-phase earthing fault |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620074963 CN200941546Y (en) | 2006-07-19 | 2006-07-19 | On-line line selection protector of single-phase earthing fault |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200941546Y true CN200941546Y (en) | 2007-08-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620074963 Expired - Fee Related CN200941546Y (en) | 2006-07-19 | 2006-07-19 | On-line line selection protector of single-phase earthing fault |
Country Status (1)
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|---|---|
| CN (1) | CN200941546Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101539607B (en) * | 2009-04-09 | 2011-10-26 | 北京市天利自动化设备研究所 | Method for grounding and selecting lines of low-current grounding system and device |
| CN104698345A (en) * | 2015-03-31 | 2015-06-10 | 襄阳科能机电设备有限公司 | Data acquisition and processing system for small current neutral grounding line selection |
| CN108873772A (en) * | 2018-06-08 | 2018-11-23 | 安徽捷迅光电技术有限公司 | A kind of color selector breakdown judge display system |
-
2006
- 2006-07-19 CN CN 200620074963 patent/CN200941546Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101539607B (en) * | 2009-04-09 | 2011-10-26 | 北京市天利自动化设备研究所 | Method for grounding and selecting lines of low-current grounding system and device |
| CN104698345A (en) * | 2015-03-31 | 2015-06-10 | 襄阳科能机电设备有限公司 | Data acquisition and processing system for small current neutral grounding line selection |
| CN108873772A (en) * | 2018-06-08 | 2018-11-23 | 安徽捷迅光电技术有限公司 | A kind of color selector breakdown judge display system |
| CN108873772B (en) * | 2018-06-08 | 2021-05-04 | 安徽捷迅光电技术有限公司 | Color sorter fault judgment display system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070829 Termination date: 20110719 |