CN1258094C - Electronic induce electroscope with direction discrimination function - Google Patents
Electronic induce electroscope with direction discrimination function Download PDFInfo
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- CN1258094C CN1258094C CN 200310122730 CN200310122730A CN1258094C CN 1258094 C CN1258094 C CN 1258094C CN 200310122730 CN200310122730 CN 200310122730 CN 200310122730 A CN200310122730 A CN 200310122730A CN 1258094 C CN1258094 C CN 1258094C
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Abstract
The present invention relates to an electronic induction type electroscope with a direction judgment function, which is designed according to the principle of the surrounding space electric field distribution of electrified objects. An electronic circuit comprises an I-V current-voltage convertor, a V-F voltage-frequency convertor, a voltage comparator and an acoustic-optic displayer, wherein the input end of the I-V convertor is connected with an induction electrode, and the V-F convertor and the voltage comparator are respectively connected with the output end of the I-V convertor; output ends of the V-F convertor and the voltage comparator are connected with the acoustic-optic displayer. The induction electrode (an antenna) is in the front of the position and is near the electrified objects, and a grounding electrode (a ground end) is behind the space position and is gripped by hands of users. When the electroscope moves towards the electrified objects, induction current can vary following the variation of space electric potential so as to send out acoustic-optic early warning signals or send out warning signals, and thus, the direction of movement of the induction electroscope can be judged so as to judge weather the electroscope moves towards the electrified objects.
Description
Technical field:
The present invention relates to a kind of electric induction type electroscope, relate in particular to a kind of electric induction type electroscope, be used for the noncontact mode and check alternating current, belong to electrotechnical measurement electronic circuit technology field in the electricity with electric field intensity discriminating direction function.
Background technology:
Electroscope is called " electroprobe " in the low-voltage electrical field.Conventional electroscope all is a galvanoscopic metal electrode directly will be contacted just with the metal electrode of tested object to finish the electrical verification process.If the metal electrode that tested object does not have to expose just can't carry out electrical verification.And such situation still is a lot, for example, and insulated conductor, high-tension switch cabinet, GIS (Electrode in Gas Insulated System) electrical equipment etc.Often need to solve the electrical verification problem that can't directly contact in the engineering reality, as the insulation sheath that contacts insulated conductor carries out electrical verification, electrical verification outside the high-tension switch cabinet glass window in the insulation basin edge electrical verification of GIS etc., does not have this type of correlation technique file report at present.
Summary of the invention:
The objective of the invention is at the deficiencies in the prior art and actual needs, a kind of electric induction type electroscope with electric field intensity discriminating direction function is provided, can realize the testee that insulation sheath is arranged is carried out electrical verification the electrical verification problem that solution can't directly contact testee.
Near the AC field relevant of the existence of object that has alternating current with the object current potential.The distribution of this AC field is: electrified body metal surface potential value maximum, and with leaving electrified body, the space potential value also just reduces gradually, and potential value is zero when the arrival point current potential.Be nonlinear relationship between them, a zonule potential value is bigger near electrified body, and potential value alters a great deal, and beyond zone far away slightly, potential value is just very little, and changes also very slow.The present invention utilizes the characteristics of this Electric Field Distribution design electric induction type electroscope, carries out the induction electrical verification of electrified body.
Electroscope of the present invention is according to charged object surrounding space Electric Field Distribution principle design.Electric induction type electroscope with discriminating direction function has two electrodes, and one is the induction electrode (antenna) that is connected with the input end of electronic circuit, and another is the earthing pole that is connected with the common port of electronic circuit (hold).On the locus, induction electrode is preceding, near electrified body, earthing pole after, be held in user's hand.When electroscope was in the electric field of electrified body generation, induction electrode just was in high potential, and earthing pole just is in electronegative potential.Will in electronic circuit, produce induction current by the potential difference (PD) between two electrodes, at electroscope when electrified body moves, the variation that induced electricity fails to be convened for lack of a quorum owing to space potential changes, send the acousto-optic early warning signal or send alerting signal then, can differentiate the galvanoscopic direction of motion of induction thus, whether differentiate electroscope facing to the electrified body motion.
The galvanoscopic electronic circuit of the present invention mainly comprises the I-V current-to-voltage converter, V-F Voltage-to-frequency Converter, voltage comparator and sound and light display four parts.V-F transducer and voltage comparator are connected in parallel between I-V transducer and the sound and light display.The input end of I-V transducer is connected with the sheet metal of induction electrode (antenna), the output of I-V transducer links to each other with V-F transducer, voltage comparator respectively, the V-F transducer links to each other with sound and light display with the output of voltage comparator, and sound and light display is the output indication.
The present invention adopts an operational amplifier to constitute the I-V transducer, adopts an operational amplifier and SCR controllable silicon to constitute voltage comparator, and the 331V-F translation circuit constitutes the V-F transducer, and 555 time base circuits, light emitting diode and hummer constitute sound and light display.
The induction current of induction electrode (antenna) enters the I-V transducer and is converted to the corresponding proportion voltage signal, this voltage signal is divided into two-way, one the tunnel enters the V-F transducer changes output frequency, cause the rising of sound and light signal frequency, another road enters the voltage comparator of amplifier and controllable silicon formation, after further amplifying, and the conducting controllable silicon, make sound and light show circuit export continuous sound and light signal, be formal alerting signal.And rising tune sound and light signal before this is an early warning signal, shows that electroscope is near electrified body.
In the time of near electroscope is in charged object, galvanoscopic induction electrode (antenna) will induce the corresponding alternating current of space potential value with the present position, and this electric current is exported a relevant voltage after entering the I-V transducer.This voltage enters the V-F transducer and will export the pulse signal of a frequency relevant with magnitude of voltage and remove to trigger sound and light display.This voltage enters voltage comparator and predeterminated voltage compares.As reach predeterminated voltage then voltage comparator output high level go the guide sound optical display unit to make sound and light display send lasting ruddiness and buzzer.Otherwise do not change the state of sound and light display with regard to output low level.
When electroless state, non-inductive alternating current input, the I-V transducer is only exported a very low offset voltage, and this voltage triggers sound and light display by the pulse signal of an extremely low frequency of V-F transducer output, makes sound and light display send interrupted ruddiness of extremely low frequency and buzzer.Along with electroscope is close to charged object, galvanoscopic induction current increases gradually, and the output voltage of current-to-voltage converter also increases gradually, and the pulsed frequency of V-F transducer output also improves gradually.The frequency that so just makes sound and light display send interrupted ruddiness and buzzer also improves gradually.The frequency of galvanoscopic user by ruddiness and buzzer improves gradually, and can to differentiate oneself hand-held electroscope be near charged object.The place ahead that is to say the electroscope motion is an electrified body.
Electroscope of the present invention can be according to different needs, by the different electrode shapes and the setting of position, different hand-held and the parameter of regulating electronic circuit, be designed to the electroscope that various electric pressures are used, 500kV from civilian 220V to electric power transfer also can be used for the electrical verification of GIS electrical equipment and high-tension switch cabinet.
Description of drawings:
Fig. 1 is the galvanoscopic theory diagram of electric induction type of the present invention.
Fig. 2 is the circuit diagram of electric induction type electroscope embodiment of the present invention.
Among Fig. 2, operational amplifier U1A constitutes the I-V transducer; Operational amplifier U1B and Q2 (SCR thyristor, controllable silicon) constitute voltage comparator; U2 (331V-F translation circuit) constitutes the V-F transducer; U3 (555 time base circuit) and light emitting diode, hummer constitutes sound and light display.
Embodiment:
Below in conjunction with drawings and Examples technical scheme of the present invention is further described.
The galvanoscopic theory diagram of electric induction type of the present invention as shown in Figure 1, electroscope mainly comprises the I-V current-to-voltage converter, V-F Voltage-to-frequency Converter, voltage comparator and sound and light display four parts.The input end of I-V transducer is connected with the sheet metal of induction electrode (antenna), and the output of I-V transducer links to each other with V-F transducer, voltage comparator respectively, and the V-F transducer links to each other with sound and light display with the output of voltage comparator.Physical circuit is formed as shown in Figure 2.
Among Fig. 2, operational amplifier U1A constitutes the I-V transducer, and operational amplifier U1B and Q2 (SCR thyristor, controllable silicon) constitute voltage comparator; U2 (331V-F translation circuit) constitutes the V-F transducer, and U3 (555 time base circuit) constitutes sound and light display with light emitting diode, hummer.Induction current changes resistance R 1 numerical value with regard to scalable sensitivity by J1 input I-V transducer.Because single supply, the induction current conversion has been a DC voltage during output voltage after the conversion of I-V transducer.This voltage one tunnel enters the voltage comparator of U1B and Q2 formation, and another road enters the V-F transducer that U2 constitutes; Change output frequency, make U3 and light emitting diode, the output sound and light signal of the sound and light display that hummer constitutes modifies tone.When this voltage was enough big, the Q2 conducting made sound and light display export continuous sound and light signal, and this is formal alerting signal.Rising tune sound and light signal before this is an early warning signal, is used to indicate electroscope approaching to electrified body.
When electroscope was in no electric position, sound and light display sent interrupted ruddiness of extremely low frequency and buzzer.When electroscope was in charged position, promptly electroscope was in by near the charged object of electrical verification the time, and sound and light display sends lasting ruddiness and buzzer.As by the not charged then same state when being in no electric position of electrical verification object.
When electroscope from no electric position during by the charged object motion of electrical verification, interrupted flash of light that sound and light display sends and buzzer will have one from low frequency intermittently to the interrupted change procedure of high-frequency, when arriving the electrical verification position, sound and light display sends lasting ruddiness and buzzer.
The present invention can be designed to the electroscope that various electric pressures are used.For the low pressure electroscope, electroscope can be designed to hand-held, antenna surface is placed in the inner face of electroscope forefront.The insulation sheath that hand-held electroscope is adjacent to insulated line with antenna surface just can verify that inner lead is whether with the alternating current of 220V.For high-tension switch cabinet and GIS electrical equipment electroscope, can be designed to hand-held, adjust galvanoscopic sensitivity, the insulation basin that hand-held electroscope is adjacent to high-tension switch cabinet glass window or GIS electrical equipment with antenna surface just can verify that the internal high pressure lead is whether with the state of alternating current and internal switch.Electroscope can be designed to cylindrically to the high-voltage conducting wires electrical verification, antenna surface is placed in the inner face of electroscope forefront, galvanoscopic afterbody is connected with a corresponding insulating bar.Adjust sensitivity, increase the brightness and the loudness of sound and light alarm.Hand-held insulating bar gets final product electrical verification with the insulation sheath that antenna surface is adjacent to the High-Voltage Insulation electric wire.
Claims (1)
1, a kind of electric induction type electroscope with electric field intensity discriminating direction function, it is characterized in that comprising the I-V current-to-voltage converter, the V-F Voltage-to-frequency Converter, voltage comparator and sound and light display, the input end of I-V transducer is connected with induction electrode, the output of I-V transducer respectively with the V-F transducer, voltage comparator links to each other, the V-F transducer links to each other with sound and light display with the output of voltage comparator, wherein, an operational amplifier (U1A) constitutes the I-V transducer, another operational amplifier (U1B) constitutes voltage comparator with controllable silicon (Q2), 331V-F translation circuit (U2) constitutes V-F transducer, 555 time base circuits (U3) and light emitting diode, hummer constitutes sound and light display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310122730 CN1258094C (en) | 2003-12-19 | 2003-12-19 | Electronic induce electroscope with direction discrimination function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310122730 CN1258094C (en) | 2003-12-19 | 2003-12-19 | Electronic induce electroscope with direction discrimination function |
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| Publication Number | Publication Date |
|---|---|
| CN1553199A CN1553199A (en) | 2004-12-08 |
| CN1258094C true CN1258094C (en) | 2006-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200310122730 Expired - Fee Related CN1258094C (en) | 2003-12-19 | 2003-12-19 | Electronic induce electroscope with direction discrimination function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106449192A (en) * | 2016-11-08 | 2017-02-22 | 国网山东省电力公司枣庄供电公司 | Electroscopic insulating rod |
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| CN1553199A (en) | 2004-12-08 |
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