CN201359629Y - Direct-current power supply grounding alarm device - Google Patents
Direct-current power supply grounding alarm device Download PDFInfo
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- CN201359629Y CN201359629Y CN 200820170633 CN200820170633U CN201359629Y CN 201359629 Y CN201359629 Y CN 201359629Y CN 200820170633 CN200820170633 CN 200820170633 CN 200820170633 U CN200820170633 U CN 200820170633U CN 201359629 Y CN201359629 Y CN 201359629Y
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Abstract
A direct-current power supply grounding alarm device comprises a cathode potential pull-down circuit, a direct-current detecting circuit, an alternating-current detecting circuit, a first photoelectric coupling circuit, a second photoelectric coupling circuit, a third photoelectric coupling circuit, an alarm and an alarm processor; wherein the alarm processor is used to judge different grounding faults according to the potential change signal of each photoelectric coupling circuit and output an alarm signal to the alarm; the cathode potential pull-down circuit is connected with the cathode of a direct-current power supply; the output of the cathode potential pull-down circuit is connected with the direct-current detecting circuit which is connected with the first photoelectric coupling circuit, the second photoelectric coupling circuit and the alternating-current detecting circuit; the alternating-current detecting circuit is connected with the third photoelectric coupling circuit; the first photoelectric coupling circuit, the second photoelectric coupling circuit and the third photoelectric coupling circuit are respectively connected with the three input ends of the alarm processor; and the output end of the alarm processor is connected with the alarm. The utility model can detect grounding faults.
Description
Technical field
The utility model belongs to a kind of direct supply test unit, especially a kind of direct-current power supply earthing alarm unit.
Background technology
At present, extend electric substation in engineering debug for 500kV, 220kV, carry out in order to ensure the safe and reliable of electrical network, when element debugging and whole group transmission, often use interim direct supply, interim direct supply can not detection of ground faults, though before transmission, will carry out Insulation Test, but Insulation Test is a static process just, promptly the contact of all devices is states, Insulation Test can not guarantee that all loops and contact are good in the different conditions insulation, and just can reflect all states in transmission process.The shortcoming that exists: the earth fault that can not detect direct supply.
Summary of the invention
For the existing direct supply that overcomes can not detection of ground faults deficiency, the utility model provides a kind of direct-current power supply earthing alarm unit that can detection of ground faults.
The technical scheme that its technical matters that solves the utility model adopts is:
A kind of direct-current power supply earthing alarm unit, put and comprise negative pole current potential pull-down circuit, the direct current detecting circuit, exchange detecting circuit, the first photoelectricity coupled circuit, the second photoelectricity coupled circuit, the 3rd photoelectricity coupled circuit, alarm be used for according to the different earth fault of the potential change signal determining of each photoelectricity coupled circuit and to the alarm processor of alarm output alarm signal, described negative pole current potential pull-down circuit connects the negative pole of direct supply, the output of described negative pole current potential pull-down circuit connects the direct current detecting circuit, described direct current detecting circuit connects the first photoelectricity coupled circuit and the second photoelectricity coupled circuit, described direct current detecting circuit is connected with described interchange detecting circuit simultaneously, described AC detection circuit is connected with described the 3rd coupled circuit, the described first photoelectricity coupled circuit, the second photoelectricity coupled circuit is connected with three input ends of described alarm processor respectively with the 3rd coupled circuit, and the output terminal of described alarm processor connects alarm.
Further, described negative pole current potential pull-down circuit comprises first resistance R 1, second resistance R 2 and the negative supply-VCC, the negative pole of described direct supply is connected with described first resistance R 1, and described first resistance R 1 is connected with second resistance R 2, and described second resistance R 2 connects negative supply-VCC; Described direct current detecting circuit comprises the 3rd resistance R 3, first capacitor C 1 and second capacitor C 2, the branch road that described first capacitor C 1 and 2 series connection of second capacitor C form is in parallel with the 3rd resistance R 3, intermediate node between described first resistance R 1 and second resistance R 2 is connected with the connected node between described the 3rd resistance R 3 and first capacitor C 1, and described second resistance R 2 is connected with intermediate node between first capacitor C 1 and second capacitor C 2; Connected node between described the 3rd resistance R 3 and second capacitor C 2 is connected with the input of the first photoelectricity coupled circuit is anodal, and the input negative pole of the described first photoelectricity coupled circuit connects negative supply.
Further, the connected node between described the 3rd resistance R 3 and second capacitor C 2 is connected with the input of the second photoelectricity coupled circuit is anodal, and the input negative pole of the described second photoelectricity coupled circuit connects negative supply.
Further again, described interchange detecting circuit comprises the 3rd capacitor C 3, transformer T1, rectification circuit IC5, the 4th resistance R 4, the 5th resistance R 5 and the 4th capacitor C 4; Described first resistance R 1 is connected with the 3rd capacitor C 3 with intermediate node between second resistance R 2, described the 3rd capacitor C 3 is connected with the former limit of transformer T1, the secondary of described transformer T1 is connected with the input end of rectification circuit IC5, the positive pole of the output terminal of described finishing circuit IC5 connects the 4th resistance R 4, described the 4th resistance R 4 is connected with the 6th resistance R 6, the negative pole of the output terminal of described finishing circuit IC5 is connected with the 4th diode D4, be connected with the negative pole of the output terminal of described finishing circuit IC5 by the 5th resistance R 5 with intermediate node between the 6th resistance R 6 in described the 4th resistance R 4, described the 4th capacitor C 4 is in parallel with described the 5th resistance R 5, and described the 6th resistance R 6 is connected with the output terminal of described the 3rd photoelectricity coupled circuit with the 4th electric capacity D4.
The beneficial effects of the utility model mainly show: can detection of ground faults, and promptly detect minus earth, complete machine ground connection and interchange and seal in the direct current fault.
Description of drawings
Fig. 1 is the control principle figure of direct-current power supply earthing alarm unit;
Fig. 2 is the circuit diagram of grounding alarm circuit.
Fig. 3 is the process flow diagram of alarm processor.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
With reference to Fig. 1-Fig. 3, a kind of direct-current power supply earthing alarm unit, put and comprise negative pole current potential pull-down circuit, the direct current detecting circuit, exchange detecting circuit, the first photoelectricity coupled circuit IC1, the second photoelectricity electric IC2 that is coupled, the 3rd photoelectricity coupled circuit IC3, alarm be used for according to the different earth fault of the potential change signal determining of each photoelectricity coupled circuit and to the alarm processor IC4 of alarm output alarm signal, described negative pole current potential pull-down circuit connects the negative pole of direct supply, the output of described negative pole current potential pull-down circuit connects the direct current detecting circuit, described direct current detecting circuit connects the first photoelectricity coupled circuit and the second photoelectricity coupled circuit, described direct current detecting circuit is connected with described interchange detecting circuit simultaneously, described AC detection circuit is connected with described the 3rd coupled circuit, the described first photoelectricity coupled circuit, the second photoelectricity coupled circuit is connected with three input ends of described alarm processor respectively with the 3rd coupled circuit, and the output terminal of described alarm processor IC4 connects alarm.
Described negative pole current potential pull-down circuit comprises first resistance R 1, second resistance R 2 and the negative supply-VCC, and the negative pole of described direct supply is connected with described first resistance R 1, and described first resistance R 1 is connected with second resistance R 2, and described second resistance R 2 connects negative supply-VCC; Described direct current detecting circuit comprises the 3rd resistance R 3, first capacitor C 1 and second capacitor C 2, the branch road that described first capacitor C 1 and 2 series connection of second capacitor C form is in parallel with the 3rd resistance R 3, intermediate node between described first resistance R 1 and second resistance R 2 is connected with the connected node between described the 3rd resistance R 3 and first capacitor C 1, and described second resistance R 2 is connected with intermediate node between first capacitor C 1 and second capacitor C 2; Connected node between described the 3rd resistance R 3 and second capacitor C 2 is connected with the input of the first photoelectricity coupled circuit is anodal, and the input negative pole of the described first photoelectricity coupled circuit connects negative supply.
Connected node between described the 3rd resistance R 3 and second capacitor C 2 is connected with the input of the second photoelectricity coupled circuit is anodal, and the input negative pole of the described second photoelectricity coupled circuit connects negative supply.
Described interchange detecting circuit comprises the 3rd capacitor C 3, transformer T1, rectification circuit IC5, the 4th resistance R 4, the 5th resistance R 5 and the 4th capacitor C 4; Described first resistance R 1 is connected with the 3rd capacitor C 3 with intermediate node between second resistance R 2, described the 3rd capacitor C 3 is connected with the former limit of transformer T1, the secondary of described transformer T1 is connected with the input end of rectification circuit IC5, the positive pole of the output terminal of described finishing circuit IC5 connects the 4th resistance R 4, described the 4th resistance R 4 is connected with the 6th resistance R 6, the negative pole of the output terminal of described finishing circuit IC5 is connected with the 4th diode D4, be connected with the negative pole of the output terminal of described finishing circuit IC5 by the 5th resistance R 5 with intermediate node between the 6th resistance R 6 in described the 4th resistance R 4, described the 4th capacitor C 4 is in parallel with described the 5th resistance R 5, and described the 6th resistance R 6 is connected with the output terminal of described the 3rd photoelectricity coupled circuit with the 4th electric capacity D4.
Among Fig. 1 of present embodiment, AC/DC: monitored main power power-supply, 88V, 110V, 176V and 220V are arranged, OUT is an output terminal; DC: monitoring part working power; IC4: single-chip microcomputer, be responsible for detecting and the recording processing data; LED: show output, show state; Warn: alarm output.
Each element function declaration: R1, R2 among Fig. 2 forms negative pole current potential pull down resistor; R3, C1, C2 form direct current and detect branch road; C3, T1, IC5, R4, R5, C4 form interchange and detect branch road; IC1, IC2, IC3 are photoelectricity isolation coupling circuit, finish the isolation coupling of signal to single-chip microcomputer; IC4 is 8 single-chip microcomputers, finishes input and analytic record, and control alarm and display part co-ordination; Warn is audible and visual alarm output; LED is responsible for show state, number of times, information such as time; AC/DC is main power power-supply.
The course of work of present embodiment is: the LED charactron is just often showing: 0000, and the number of times R2 resistance drop of record earth fault is greater than the detected value record; Warning when each fault takes place, and show current fault type and start-up time (up to recovering); Continuous alarm when arriving cumulative number.
Judge running status by negative pole, in normal operation, the negative pole current potential is-Vcc.The testing circuit no-output, IC1, IC2, IC3 output triode end, and all are in noble potential, and single-chip microcomputer is in waiting status.
The minus earth state: the negative pole current potential rises to 0V by original-5V.This voltage is delivered to IC1 through R1, R3, D2, and the first via I/O port of electronegative potential to single-chip microcomputer sent in the conducting of IC1 output triode, and single-chip microcomputer is started shooting fault-time according to negative ground connection counting of this signal accumulative total and record.D3 is in cut-off state, and IC2 keeps noble potential output, and DC voltage can't be passed through C3, and AC detection circuit does not detect AC signal makes IC3 also keep noble potential output.
The plus earth state: the negative pole current potential=-Vcc+Vdc.This voltage is delivered to IC2 through R1, R3, D3, and IC2 sends the second road I/O port of electronegative potential to single-chip microcomputer, and single-chip microcomputer is started shooting fault-time according to positive ground connection counting of this signal accumulative total and record.D2 is in cut-off state, and IC1 keeps noble potential output, and DC voltage can't be passed through C3, and AC detection circuit does not detect AC signal makes IC3 also keep noble potential output.
Interchange seals in straight-flow system: the AC compounent of negative pole is coupled rectification circuit and detects.This voltage is delivered to T1 through R1, C3 and is coupled to IC5, after the IC5 rectification, puncture by R4, R5 dividing potential drop, C4 filtering, R6 current limliting D4, make IC3 be in conducting state, send the Third Road I/O port of electronegative potential to single-chip microcomputer, single-chip microcomputer seals in the straight-flow system counting according to this signal accumulative total interchange and record is started shooting fault-time.And this AC signal is behind R1, R3, by the C2 filtering, so the direct current component no signal, D2, D3 all are in cut-off state, and IC1, IC2 all keep noble potential output.
Display mode: group of four figures pipe, normally show 0000, the fault trailing wheel shows.Positive ground connection 1-01 take turns apparent 00:01 start-up time; Negative ground connection 2-01 take turns apparent 00:01 start-up time; Interchange seals in 3-01 and takes turns start-up time and to show 00:01; Show 0000 by all data zero clearings after the reset key.
Claims (4)
1, a kind of direct-current power supply earthing alarm unit, it is characterized in that: described direct-current power supply earthing alarm unit comprises negative pole current potential pull-down circuit, the direct current detecting circuit, exchange detecting circuit, the first photoelectricity coupled circuit, the second photoelectricity coupled circuit, the 3rd photoelectricity coupled circuit, alarm be used for according to the different earth fault of the potential change signal determining of each photoelectricity coupled circuit and to the alarm processor of alarm output alarm signal, described negative pole current potential pull-down circuit connects the negative pole of direct supply, the output of described negative pole current potential pull-down circuit connects the direct current detecting circuit, described direct current detecting circuit connects the first photoelectricity coupled circuit and the second photoelectricity coupled circuit, described direct current detecting circuit is connected with described interchange detecting circuit simultaneously, described AC detection circuit is connected with described the 3rd coupled circuit, the described first photoelectricity coupled circuit, the second photoelectricity coupled circuit is connected with three input ends of described alarm processor respectively with the 3rd coupled circuit, and the output terminal of described alarm processor connects alarm.
2, direct-current power supply earthing alarm unit as claimed in claim 1, it is characterized in that: described negative pole current potential pull-down circuit comprises first resistance (R1), second resistance (R2) and negative supply (VCC), the negative pole of described direct supply is connected with described first resistance (R1), described first resistance (R1) is connected with second resistance (R2), and described second resistance (R2) connects negative supply (VCC); Described direct current detecting circuit comprises the 3rd resistance (R3), first electric capacity (C1) and second electric capacity (C2), the branch road that described first electric capacity (C1) and second electric capacity (C2) series connection form is in parallel with the 3rd resistance (R3), intermediate node between described first resistance (R1) and second resistance (R2) is connected with the connected node between described the 3rd resistance (R3) and first electric capacity (C1), and described second resistance (R2) is connected with intermediate node between first electric capacity (C1) and second electric capacity (C2);
Connected node between described the 3rd resistance (R3) and second electric capacity (C2) is connected with the input of the first photoelectricity coupled circuit is anodal, and the input negative pole of the described first photoelectricity coupled circuit connects negative supply.
3, direct-current power supply earthing alarm unit as claimed in claim 2, it is characterized in that: the connected node between described the 3rd resistance (R3) and second electric capacity (C2) is connected with the input of the second photoelectricity coupled circuit is anodal, and the input negative pole of the described second photoelectricity coupled circuit connects negative supply.
4, as claim 2 or 3 described direct-current power supply earthing alarm units, it is characterized in that: described interchange detecting circuit comprises the 3rd electric capacity (C3), transformer (T1), rectification circuit (IC5), the 4th resistance (R4), the 5th resistance (R5) and the 4th electric capacity (C4); Described first resistance (R1) is connected with the 3rd electric capacity (C3) with intermediate node between second resistance (R2), described the 3rd electric capacity (C3) is connected with the former limit of transformer (T1), the secondary of described transformer (T1) is connected with the input end of rectification circuit (IC5), the positive pole of the output terminal of described finishing circuit (IC5) connects the 4th resistance (R4), described the 4th resistance (R4) is connected with the 6th resistance (R6), the negative pole of the output terminal of described finishing circuit (IC5) is connected with the 4th diode (D4), be connected by the negative pole of the 5th resistance (R5) with intermediate node between the 6th resistance (R6) at described the 4th resistance (R4) with the output terminal of described finishing circuit (IC5), described the 4th electric capacity (C4) is in parallel with described the 5th resistance (R5), and described the 6th resistance (R6) is connected with the output terminal of described the 3rd photoelectricity coupled circuit with the 4th electric capacity (D4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200820170633 CN201359629Y (en) | 2008-12-30 | 2008-12-30 | Direct-current power supply grounding alarm device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200820170633 CN201359629Y (en) | 2008-12-30 | 2008-12-30 | Direct-current power supply grounding alarm device |
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| Publication Number | Publication Date |
|---|---|
| CN201359629Y true CN201359629Y (en) | 2009-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200820170633 Expired - Lifetime CN201359629Y (en) | 2008-12-30 | 2008-12-30 | Direct-current power supply grounding alarm device |
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| CN (1) | CN201359629Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101452036B (en) * | 2008-12-30 | 2011-03-23 | 浙江省送变电工程公司 | Direct-current power supply earthing alarm unit |
| CN103575965A (en) * | 2012-08-02 | 2014-02-12 | 温州市科星电子有限公司 | Direct current system monitoring device and method |
| CN103675710A (en) * | 2012-09-24 | 2014-03-26 | 温州市科星电子有限公司 | Alarm device for AC flowing into DC power supply for substation |
| CN104459291A (en) * | 2014-12-15 | 2015-03-25 | 南车株洲电力机车有限公司 | Method and system for detecting AC signals of specific frequency |
-
2008
- 2008-12-30 CN CN 200820170633 patent/CN201359629Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101452036B (en) * | 2008-12-30 | 2011-03-23 | 浙江省送变电工程公司 | Direct-current power supply earthing alarm unit |
| CN103575965A (en) * | 2012-08-02 | 2014-02-12 | 温州市科星电子有限公司 | Direct current system monitoring device and method |
| CN103675710A (en) * | 2012-09-24 | 2014-03-26 | 温州市科星电子有限公司 | Alarm device for AC flowing into DC power supply for substation |
| CN104459291A (en) * | 2014-12-15 | 2015-03-25 | 南车株洲电力机车有限公司 | Method and system for detecting AC signals of specific frequency |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20091209 Effective date of abandoning: 20081230 |