CN201293815Y - Apparatus for detecting zero/live wire polarity and testing ground resistance - Google Patents

Apparatus for detecting zero/live wire polarity and testing ground resistance Download PDF

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Publication number
CN201293815Y
CN201293815Y CNU2008201149456U CN200820114945U CN201293815Y CN 201293815 Y CN201293815 Y CN 201293815Y CN U2008201149456 U CNU2008201149456 U CN U2008201149456U CN 200820114945 U CN200820114945 U CN 200820114945U CN 201293815 Y CN201293815 Y CN 201293815Y
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CN
China
Prior art keywords
resistance
chip microcomputer
relay
pin
precision
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Expired - Fee Related
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CNU2008201149456U
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Chinese (zh)
Inventor
夏运明
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Shenzhen Long Duo Electronic Science & Technology Co Ltd
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Shenzhen Long Duo Electronic Science & Technology Co Ltd
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Priority to CNU2008201149456U priority Critical patent/CN201293815Y/en
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Abstract

The utility model provides a device for detecting the polarity of zero line and living line and testing grounding resistance testing, which can measure grounding resistance safely. The device is characterized by comprising five parts such as: 1, a power supply part; 2, a converting part; 3, a measuring part; 4, a single chip; 5, an input and output part for outputting test result and inputting start and stop signals. The device for detecting the polarity of zero line and living line and testing grounding resistance testing has safe test, fast detection and comprehensive detection, adopts the single chip as control core, has acoustic and light prompts, has an interface circuit for connecting other control systems, and can provide detection result for other circuits and receive the commands of other circuits (such as start and stop signals and the like).

Description

A kind of zero live wire polarity detects and the earth resistance device
Technical field
The utility model relates to the Electrical Measurement Technology field, and particularly a kind of zero live wire polarity detects and the earth resistance device.
Background technology
Existing matured product is not seen and zero live wire polarity is detected and two functions of grounding resistance measurement realize on a product.Existing earthmeter matured product cost height---middle-grade type product price more than 5000 yuan, surveying work amount big---needing beat pile, earthed system is had specific (special) requirements---need have two above earth points.The grounding resistance measurement product that some simple types are also arranged now, all exist measurement dangerous---directly through resistance ground wire is discharged with live wire, unsettled as ground wire in the case, will on the ground wire with on dangerous 220V high pressure, continue to discharge over the ground---the no ground wire break-make of test circuit control function itself, cause that electric current, no communication port are arranged in the ground wire all the time---can't with other circuit UNICOMs, exchange message.
Investigation result shows that China's urban family power utilization environment present situation allows of no optimist, and no ground wire and ground connection is unreliable to have become modal problem.Make electrical appliance in this case in case electric leakage will make the electrical equipment exposed parts charged, the electric shock casualty accident takes place.
In addition, zero line, live wire connect instead and also can cause shock hazard.Electric equipment products all are that safety devices such as switch, fuse are placed on the live wire when design, jeopardize the human body high pressure to guarantee that electrical equipment does not have when these devices disconnect.When zero line, live wire connect inverse time, even switch, elements such as fuse disconnect electrical equipment appoints and has high pressure, electric shock still can take place during contact hurt sb.'s feelings.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, provide a kind of zero live wire polarity to detect and the earth resistance device.
Zero live wire polarity detects and the earth resistance module is to be the testing circuit of core with the single-chip microcomputer.Zero live wire polarity and stake resistance to electric power system are measured, and provide prompting when detecting when electric power system has above-mentioned unsafe conditions: comprise direct prompting user's sound and light alarm and use error signal for other circuit.
The technical scheme that the utility model adopted is:
A kind of zero live wire polarity detects and the earth resistance device is formed (referring to Fig. 1) by 5 parts: one, and power unit is used to other 4 parts that power supply is provided; Two, conversion portion, be used for one test period domestic demand finish ground connection break-make conversion, test voltage selects conversion, discharge current to select conversion, this part is subjected to Single-chip Controlling to finish these to change; Three, measure portion, being used for the precision resistance dividing potential drop is that single-chip microcomputer provides the voltage range that satisfies its range; Four, single-chip microcomputer, control and data processing unit; Five, input, output, this part output testing result is imported signals such as starting, stop.
Conversion portion, measure portion, single-chip microcomputer, input, output, these several parts are core with the single-chip microcomputer, co-ordination under the control of program, finish test, the output testing result: single-chip microcomputer is realized voltage, electric current, ground connection selection by the switch on and off of four relays of delivery outlet control transformation part; The measure portion circuit is responsible for and will be input to the A/D input port of single-chip microcomputer after input ac voltage rectification, filtering, the dividing potential drop; Input, output receive external circuit signal input single-chip microcomputer, by the delivery outlet output testing result of single-chip microcomputer.
Described single-chip microcomputer passes through delivery outlet: the switch conduction and the disconnection of the pin one 4 control transformation part relays one of single-chip microcomputer, pin one 3 pilot relays two, pin one 1 pilot relay three, pin one 2 pilot relays four.
Described single-chip microcomputer is by the A/D input port: the pin one 8,19 of single-chip microcomputer is connected in the circuit of measure portion.
Described single-chip microcomputer passes through delivery outlet: the pin two of single-chip microcomputer, 3,5,6,10 is connected in input, output.
Described conversion portion comprises switching diode one, relay one, switching diode two, relay two, triode one, resistance one, resistance two, relay three, switching diode three, triode two, resistance three, resistance four, triode three, resistance five, resistance six, relay four, switching diode four, resistance seven, resistance eight and triode four, described switching diode one is parallel to relay one two ends, the collector of triode three is connected in relay one, switching diode two is parallel to relay two two ends, the collector of triode one is connected in relay two, switching diode three is parallel to relay three two ends, the collector of triode two is connected in relay three, switching diode four is parallel to relay four two ends, and the collector of triode four is connected in relay four.
Described measure portion comprises commutation diode one, commutation diode two, precision resistance one, precision resistance two, electrochemical capacitor one, precision resistance three, precision resistance four, electrochemical capacitor two, resistance nine, resistance ten, precision resistance five, switching diode five, ceramic disc capacitor one, precision resistance six, precision resistance seven, switching diode six, ceramic disc capacitor two, precision resistance eight, described commutation diode one is connected in filtering circuit electrochemical capacitor one by precision resistance one, precision resistance three, be connected to the pin one 8 of single-chip microcomputer again by resistance ten, commutation diode two is connected in filtering circuit electrochemical capacitor two by precision resistance two, precision resistance four, be connected to the pin one 9 of single-chip microcomputer again by resistance nine, precision resistance six, precision resistance seven series connection ground connection, switching diode six, ceramic disc capacitor two series connection ground connection, switching diode six positive poles are connected on precision resistance six, between the precision resistance seven, negative pole is received 16 pin of single-chip microcomputer, precision resistance five, precision resistance eight series connection ground connection, switching diode five, ceramic disc capacitor one series connection ground, switching diode five positive poles are connected on precision resistance five, between the precision resistance eight, negative pole is received 17 pin of single-chip microcomputer.
Described input, output comprise resistance 12, resistance 13, light emitting diode one, light emitting diode two, hummer, optocoupler one, optocoupler two; The pin two of single-chip microcomputer is connected in hummer, and pin 5,3,6 is connected in the two ends of light emitting diode one, light emitting diode two by resistance 13, and pin two is connected in hummer, and pin one 0,15 is connected in optocoupler one, optocoupler two.
Described single-chip microcomputer model is used S3F9454.
Beneficial effect
A) test safety, during measurement of Grounding Resistance over the ground output voltage less than 36V, electric current less than 8mA.
B) detect piece speed, one detection period disconnected test loop less than 12 seconds in non-detection time, was zero to vagabond current, avoided electric power system is exerted an influence.
C) Chuan Xin two kinds of electric current testings cooperate the scm software computing, make earth resistance stable, and better anti-interference is arranged.
D) detect comprehensively.The zero live wire polarity that electric power system is prone to connects anti-and stake resistance is excessive can detect simultaneously.
E) be the control core with the single-chip microcomputer, except that carrying sound, light prompting, also have interface circuit: can provide testing result for other circuit, receive order signals such as () starting, stop of other circuit with other control system.
Description of drawings
Fig. 1 is the circuit composition diagram of zero live wire polarity detection of the present utility model and earth resistance device.
Fig. 2 is that zero live wire polarity of the present utility model detects and the circuit of earth resistance device is formed details drawing.
Embodiment
Fig. 1 is the circuit composition diagram of zero live wire polarity detection of the present utility model and earth resistance device.Form by 5 parts: one, power unit is for other 4 parts provide power supply.Two, conversion portion, one test period domestic demand finish ground connection break-make conversion, test voltage selects conversion, discharge current to select conversion, this part is subjected to Single-chip Controlling to finish these to change.Three, measure portion is that single-chip microcomputer provides the voltage range that satisfies its range with the precision resistance dividing potential drop.Four, single-chip microcomputer, control and data processing unit.Five, input, output, this part output testing result, input starts, stop signal.
Conversion portion, measure portion, single-chip microcomputer, input, output among the figure.These several parts are core with the single-chip microcomputer, and test is finished in co-ordination under the control of program, the output testing result: single-chip microcomputer is realized voltage, electric current, ground connection selection by the switch on and off of four relays 26,28,32,40 of delivery outlet control transformation part; The measure portion circuit is responsible for and will be input to the A/D input port of single-chip microcomputer after input ac voltage rectification, filtering, the dividing potential drop; Input, output receive external circuit signal input single-chip microcomputer, by the delivery outlet output testing result of single-chip microcomputer.
Fig. 2 is that zero live wire polarity of the present utility model detects and the circuit of earth resistance device is formed details drawing.The number in the figure implication is as follows:
1, fire-wire interfaces 2, zero line interface 3, interface of the ground wire 4, transformer 5, commutation diode 6, commutation diode 7, commutation diode 8, commutation diode 9, electrochemical capacitor 10, ceramic disc capacitor 11, three terminal regulator 12, electrochemical capacitor 13, ceramic disc capacitor 14, resistance 15, commutation diode 16, commutation diode 17, precision resistance 18, precision resistance 19, electrochemical capacitor 20, precision resistance 21, precision resistance 22, electrochemical capacitor 23, resistance 24, resistance 25, switching diode 26, relay 27, switching diode 28, relay 29, triode 30, resistance 31, resistance 32, relay 33, switching diode 34, triode 35, resistance 36, resistance 37, triode 38, resistance 39, resistance 40, relay 41, switching diode 42, resistance 43, resistance 44, precision resistance 45, triode 46, switching diode 47, ceramic disc capacitor 48, precision resistance 49, precision resistance 50, switching diode 51, ceramic disc capacitor 52, precision resistance 53, resistance 54, ceramic disc capacitor 55, single-chip microcomputer 56, resistance 57, light emitting diode 58, light emitting diode 59, hummer 60, optocoupler 61, optocoupler
The course of work of circuit is described in detail as follows:
Zero live wire polarity detects with the earth resistance circuit and is connected with electric power system by terminals 1,2,3, terminals 1,2 ends enter 220V and exchange through transformer 4 step-downs, exchange through commutation diode 5,6,7,8, electrochemical capacitor 9, ceramic disc capacitor 10, three terminal regulator 11, electrochemical capacitor 12, ceramic disc capacitor 13 rectifications, filtering at the secondary 5-6 output 10V of transformer 4, voltage stabilizing obtains the 5V direct current provides working power for this circuit again.After the 5V power supply was stable, single-chip microcomputer was finished initialization and is entered duty.Single-chip microcomputer is engage relay 26 at first, make electric power system ground and microcontroller power supply UNICOM, two-way voltage measurement to after commutation diode 15, commutation diode 16, precision resistance 17, precision resistance 18, electrochemical capacitor 19, precision resistance 20, precision resistance 21, electrochemical capacitor 22, resistance 23, resistance 24 network rectifications, dividing potential drop, filtering, producing after a period of time is stable, this two-way voltage by live wire, zero line voltage-to-ground in proportion step-down obtain, judge zero by this two-way magnitude of voltage is measured, calculates, analyzed, live wire polarity.Enter the earth resistance program zero, under the correct situation of live wire polarity, at first the zero line magnitude of voltage of measuring according to previous step is selected sparking voltage over the ground: if the zero line voltage-to-ground is greater than 12V, engage relay 28 and relay 32, discharge over the ground with zero line voltage and to measure resistance to earth, if zero line voltage is less than 12V, then the interchange 12V voltage with 4 another windings of level of transformer 3-4 output is superimposed upon discharge over the ground on the zero line voltage, and concrete execution in step is engage relay 28 release relays 32.Two kinds of discharge currents are realized by pilot relay 40, when disconnecting, relay 40 only discharges by resistance 48,49 networks, when connecting, relay 40 discharges by resistance 48,49 and resistance 44,52 parallel networks, these two kinds of network discharge current values are all preserved by single chip computer measurement, single-chip microcomputer passes through the comparison to the current value of two kinds of different resistor networks discharges, obtains grounding resistance.So far, a test period finishes, and discharges all relays, outputs test result:
A) zero line, live wire detect: pass through when correct, connect inverse time red LED 57 flickers, hummer 59 short rings in per 5 seconds 3, optocoupler 61 output continuous signals.
B) earth resistance: stake resistance passes through LED 58 bright greens during less than setting value.Stake resistance reports an error during greater than setting value, LED 57 shiny reds, and hummer 59 yowled 1 in per 5 seconds.Optocoupler 61 output 100Hz square-wave signals.
Import the signal of continuous time at whole test period from optocoupler 60, then withdraw from test procedure, all circuit resets greater than 20mS.In non-test mode, more than continuous 12 waveforms of optocoupler 60 input 100Hz square-wave signals, then circuit is once tested again.

Claims (8)

1, a kind of zero live wire polarity detects and the earth resistance device, is made up of 5 parts: one, and power unit; Two, conversion portion; Three, measure portion; Four, single-chip microcomputer; Five, input, output; It is characterized in that single-chip microcomputer is realized voltage, electric current, ground connection selection by the break-make of four relays one (26), two (28), three (32), four (40) of delivery outlet control transformation part; The circuit of measure portion is responsible for and will be input to the A/D input port of single-chip microcomputer after input ac voltage rectification, filtering, the dividing potential drop; Input, output receive external circuit signal input single-chip microcomputer, by the delivery outlet output testing result of single-chip microcomputer.
2, zero live wire polarity according to claim 1 detects and the earth resistance device, it is characterized in that described single-chip microcomputer passes through delivery outlet: the switch conduction and the disconnection of the pin one 4 control transformation part relays one (26) of single-chip microcomputer, pin one 3 pilot relays two (28), pin one 1 pilot relay three (32), pin one 2 pilot relays four (40).
3, zero live wire polarity according to claim 1 detects and the earth resistance device, it is characterized in that, described single-chip microcomputer is by the A/D input port: the pin one 8,19 of single-chip microcomputer is connected in the circuit of measure portion.
4, zero live wire polarity according to claim 1 detects and the earth resistance device, and it is characterized in that described single-chip microcomputer passes through delivery outlet: the pin two of single-chip microcomputer, 3,5,6,10 is connected in input, output.
5, zero live wire polarity according to claim 1 and 2 detects and the earth resistance device, described conversion portion comprises switching diode one (25), relay one (26), switching diode two (27), relay two (28), triode one (29), resistance one (30), resistance two (31), relay three (32), switching diode three (33), triode two (34), resistance three (35), resistance four (36), triode three (37), resistance five (38), resistance six (39), relay four (40), switching diode four (41), resistance seven (42), resistance eight (43) and triode four (45), it is characterized in that, described switching diode one (25) is parallel to relay one (26) two ends, the collector of triode three (37) is connected in relay one (26), switching diode two (27) is parallel to relay two (28) two ends, the collector of triode one (29) is connected in relay two (28), switching diode three (33) is parallel to relay three (32) two ends, the collector of triode two (34) is connected in relay three (32), switching diode four (41) is parallel to relay four (40) two ends, and the collector of triode four (45) is connected in relay four (40).
6, detect and the earth resistance device according to claim 1 or 3 described zero live wire polarity, described measure portion comprises commutation diode one (15), commutation diode two (16), precision resistance one (17), precision resistance two (18), electrochemical capacitor one (19), precision resistance three (20), precision resistance four (21), electrochemical capacitor two (22), resistance nine (23), resistance ten (24), precision resistance five (44), switching diode five (46), ceramic disc capacitor one (47), precision resistance six (48), precision resistance seven (49), switching diode six (50), ceramic disc capacitor two (51), precision resistance eight (52), it is characterized in that, described commutation diode one (15) is connected in filtering circuit electrochemical capacitor one (19) by precision resistance one (17), precision resistance three (20), be connected to the pin one 8 of single-chip microcomputer again by resistance ten (24), commutation diode two (16) is connected in filtering circuit electrochemical capacitor two (22) by precision resistance two (18), precision resistance four (21), be connected to the pin one 9 of single-chip microcomputer again by resistance nine (23), precision resistance six (48), precision resistance seven (49) series connection ground connection, switching diode six (50), ceramic disc capacitor two (51) series connection ground connection, switching diode six (50) positive poles are connected on precision resistance six (48), between the precision resistance seven (49), negative pole is received 16 pin of single-chip microcomputer, precision resistance five (44), precision resistance eight (52) series connection ground connection, switching diode five (46), ceramic disc capacitor one (47) series connection ground connection, switching diode five (46) positive poles are connected on precision resistance five (44), between the precision resistance eight (52), negative pole is received 17 pin of single-chip microcomputer.
7, detect and the earth resistance device according to claim 1 or 4 described zero live wire polarity, described input, output comprise resistance ten two (53), resistance ten three (56), light emitting diode one (57), light emitting diode two (58), hummer (59), optocoupler one (60), optocoupler two (61); It is characterized in that, the pin two of single-chip microcomputer is connected in hummer (59), pin 5,3,6 is connected in the two ends of light emitting diode one (57), light emitting diode two (58) by resistance ten three (56), pin two is connected in hummer (59), and pin one 0,15 is connected in optocoupler one (60), optocoupler two (61).
8, zero live wire polarity according to claim 1 detects and the earth resistance device, it is characterized in that described single-chip microcomputer model is used S3F9454.
CNU2008201149456U 2008-05-08 2008-05-08 Apparatus for detecting zero/live wire polarity and testing ground resistance Expired - Fee Related CN201293815Y (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104345244A (en) * 2013-08-07 2015-02-11 深圳市金威源科技股份有限公司 Battery polarity detection and protection circuit
CN108845186A (en) * 2018-04-28 2018-11-20 歌尔股份有限公司 The detection circuit and detection method of ground resistance
CN109765432A (en) * 2018-12-29 2019-05-17 国网山东省电力公司高唐县供电公司 Public power distribution station ground resistance real-time monitoring system and its implementation

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104345244A (en) * 2013-08-07 2015-02-11 深圳市金威源科技股份有限公司 Battery polarity detection and protection circuit
CN104345244B (en) * 2013-08-07 2018-10-09 深圳市金威源科技股份有限公司 A kind of detection of battery polar and protection circuit
CN108845186A (en) * 2018-04-28 2018-11-20 歌尔股份有限公司 The detection circuit and detection method of ground resistance
CN109765432A (en) * 2018-12-29 2019-05-17 国网山东省电力公司高唐县供电公司 Public power distribution station ground resistance real-time monitoring system and its implementation
CN109765432B (en) * 2018-12-29 2021-08-10 国网山东省电力公司高唐县供电公司 Real-time monitoring system for ground resistance of public power distribution station area and implementation method thereof

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20090819

Termination date: 20170508

CF01 Termination of patent right due to non-payment of annual fee