CN104237599A - Width dynamic capacitive equipment leakage current sensor monitoring system - Google Patents
Width dynamic capacitive equipment leakage current sensor monitoring system Download PDFInfo
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- CN104237599A CN104237599A CN201310224832.7A CN201310224832A CN104237599A CN 104237599 A CN104237599 A CN 104237599A CN 201310224832 A CN201310224832 A CN 201310224832A CN 104237599 A CN104237599 A CN 104237599A
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Abstract
The invention discloses a width dynamic capacitive equipment leakage current sensor monitoring system comprising a DSP control circuit, a gain adjustable amplification module, an induction coil, and an A/D module; the induction coil is arranged on a capacitive equipment ground wire; current generated by the induction coil is sent to the gain adjustable amplification module unidirectionally connected with the A/D module; simulation signals of the gain adjustable amplification module are sent to the A/D module for digitlization transition; the A/D module is unidirectionally connected with the DSP control circuit; digitlization signals outputted by the A/D module are sent to the DSP control circuit so as to modify, delete and reinforce the digital signals; a specific control panel is used to dynamically adjust a sensor measuring range, so capacitor equipment leakage current in a transformer station above 110V can be solved by a public sensor, thus greatly reducing construction and maintenance cost, reducing project complexity, and improving reliability.
Description
Technical field
The present invention relates to technical field of electric equipment, specifically a kind of sensing system for monitoring wide dynamic capacitive apparatus leakage current.
Background technology
Capacitive apparatus insulated on-line monitoring technique has become and has ensured safe power generation and power supply, Timeliness coverage accident potential, the important technical that reduces interruption maintenance, improve power supply reliability, and the gordian technique of high voltage capacitive apparatus insulated on-line monitoring is the collection of Leakage Current.At present in leakage current monitoring field, there is a common problem: Sensor monitoring scope range is generally narrow, the problems such as adaptability is poor.And the primary equipment of different range leaks dimensional discrepancy comparatively greatly, cause needing multiple sensors in a project, the sensor of even multiple producer.
Summary of the invention
The object of this invention is to provide a kind of wide dynamic capacitive apparatus leakage current sensor monitoring system, overcome the above-mentioned deficiency of prior art, by special control panel, dynamic conditioning transducer range, make the capacitance apparatus leakage current that sensor uses in the transformer station of more than 110KV, can solve by a public sensor, greatly reduce and implement and maintenance cost, reduce project complexity, improve reliability.
In order to reach above-mentioned purpose of design, the technical solution used in the present invention is as follows:
A kind of wide dynamic capacitive apparatus leakage current sensor monitoring system, comprise DSP control circuit, adjustable gain amplification module, inductive coil, A/D module, described sensing coil is arranged on capacitive apparatus ground wire, the electric current that inductive coil produces is sent to adjustable gain amplification module, adjustable gain amplification module is unidirectional is connected to A/D module, the simulating signal of adjustable gain amplification module is sent to A/D module and carries out digitizing conversion, described A/D module is unidirectional is connected to DSP control circuit, the digitized signal that A/D module exports is delivered to DSP control circuit, digital signal is modified, delete, strengthening.
Preferably, be provided with photoelectric isolation module between described inductive coil and adjustable gain amplification module, the Signal separator for being produced by inductive coil is light signal and electric signal.
Preferably, described DSP control circuit is unidirectional is connected to adjustable gain amplification module.
Preferably, described DSP control circuit, A/D module, adjustable gain amplification module are connected respectively to power module, by power module be DSP control circuit, A/D module, adjustable gain amplification module provide electric energy.
More preferably, described adjustable gain amplification module is for adjusting amplification, the minification of the simulating signal received, and the simulating signal that it is exported is in the detection range ability of A/D module.
More preferably, its concrete testing process is:
1) inductive coil detects the electric current on capacitive apparatus ground wire, as no signal current on capacitive apparatus ground wire, then and inductive coil not generation current, if any electric current, then inductive coil generation current;
2) current signal produced by inductive coil by photoelectric isolation module carries out photodetachment;
3) adjustable gain amplification module is analyzed the electric signal received:
4) by A/D module, the electric signal received is carried out digitizing conversion;
5) by DSP control circuit, the digital signal after conversion is modified, deletes, strengthened, and be sent to host computer;
6) host computer sends new instruction to DSP control circuit and feeds back to adjustable gain amplification module.
More preferably, the concrete analysis process of step 3 is: if electric signal value range is in the detection range ability of A/D module, then direct this electric signal is transferred to A/D module by adjustable gain amplification module; If electric signal value range is less than the detection range ability of A/D module, then this electric signal is transferred to A/D module after in adjustable gain amplification module gain to the detection range ability of A/D module; If electric signal value range is greater than the detection range ability of A/D module, then this electric signal is transferred to A/D module after in adjustable gain amplification module gain to the detection range ability of A/D module.
The beneficial effect of wide dynamic capacitive apparatus leakage current sensor monitoring system of the present invention is: adopt digital sensor, can greatly improve the measuring precision and scope, pass through signal transacting, A/D conversion can be carried out to the data gathered, various interference noise and distortion data is filtered in source, finally in a digital manner data after process are directly sent to backstage, greatly improve measuring accuracy, avoid the test error that causes due to reasons such as distances in transmitting procedure and interference, obtain True Data.
Meanwhile, by owing to adopting Dynamic controlling order, conveniently according to actual conditions, dynamic conditioning is carried out to all tested objects, greatly reduce the difficulty of construction.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of wide dynamic capacitive apparatus leakage current sensor monitoring system of the present invention.
Embodiment
Below in conjunction with accompanying drawing, optimum implementation of the present invention is described in further detail.
As shown in Figure 1, wide dynamic capacitive apparatus leakage current sensor monitoring system described in the embodiment of the present invention, comprise DSP control circuit, photoelectric isolation module, adjustable gain amplification module, inductive coil, A/D module, power module, described sensing coil is arranged on capacitive apparatus ground wire, inductive coil is connected to adjustable gain amplification module by photoelectric isolation module is unidirectional, the electric current that inductive coil produces is sent to adjustable gain amplification module by photoelectric isolation module, adjustable gain amplification module is unidirectional is connected to A/D module, the simulating signal of adjustable gain amplification module is sent to A/D module and carries out digitizing conversion, described A/D module is unidirectional is connected to DSP control circuit, the digitized signal that A/D module exports is delivered to DSP control circuit, digital signal is modified, delete, strengthening.
The simulating signal that inductive coil exports sends into adjustable gain operation amplifier module through optoelectronic isolating element, then to A/D module, then to DSP control circuit.According to the capacitive apparatus of different electric pressure, by the corresponding gain factor of software design patterns amplification module, the Indirect method transformer ratio of current sensor, thus adapt to the range of different electric pressure capacitive apparatus Leakage Current.
Described DSP control circuit is unidirectional is connected to adjustable gain amplification module.
Described DSP control circuit, A/D module, adjustable gain amplification module are connected respectively to power module, by power module be DSP control circuit, A/D module, adjustable gain amplification module provide electric energy.
Described DSP control circuit is a kind of microprocessor of uniqueness, is to process the device of bulk information with digital signal.Its principle of work receives simulating signal, is converted to the digital signal of 0 or 1.Again digital signal modified, delete, strengthen, and in other system chip, simulated data or actual environment form are returned in numerical data decipher.It is not only programmable, and time in fact, travelling speed can reach every number of seconds with ten million bar complicated order program, considerably beyond general purpose microprocessor, is the computer chip become more and more important in the digitalized electron world.Its powerful data-handling capacity and high travelling speed are two the most commendable large characteristics.
Described A/D module is used for simulating signal to be converted to signal digital.
Described power module is used for providing electric energy for sensor.
Described inductive coil is responsible for carrying out electromagnetic induction to the weak current passed through, and obtains the value of corresponding weak current.Because electric current is extremely faint, consider on-the-spot interference, the factors such as the feeble signal of components and parts itself, system has done complete consideration in circuit and embedded program simultaneously.
Described photoelectric isolation module is used for light signal, electric signal to be separated.
Described adjustable gain amplification module is for adjusting amplification, the minification of the simulating signal received, and the simulating signal that it is exported is in the detection range ability of A/D module.
Its principle is: be arranged on by inductive coil on capacitive apparatus ground wire, and according to Ampere circuit law, exchange the change that Leakage Current causes magnetic flux in coil, thus drive coil produces induction current, leakage current signal is generally from microampere to milliampere level; When Leakage Current signal is very faint, coil-induced electric current is fainter, and send instruction to DSP control circuit by upper computer software, DSP control circuit increases the gain factor of adjustable gain amplification module; When Leakage Current is larger, sensor current signal clearly, DSP control circuit just reduces the gain factor of adjustable gain amplification module, makes the electric current exported from adjustable gain amplification module all the time in the detection range ability of A/D module, obtains Leakage Current size accurately.
Concrete steps are:
1) inductive coil detects the electric current on capacitive apparatus ground wire, as no signal current on capacitive apparatus ground wire, then and inductive coil not generation current, if any electric current, then inductive coil generation current;
2) current signal produced by inductive coil by photoelectric isolation module carries out photodetachment;
3) adjustable gain amplification module is analyzed the electric signal received:
If electric signal value range is in the detection range ability of A/D module, then direct this electric signal is transferred to A/D module by adjustable gain amplification module; If electric signal value range is less than the detection range ability of A/D module, then this electric signal is transferred to A/D module after in adjustable gain amplification module gain to the detection range ability of A/D module; If electric signal value range is greater than the detection range ability of A/D module, then this electric signal is transferred to A/D module after in adjustable gain amplification module gain to the detection range ability of A/D module;
4) by A/D module, the electric signal received is carried out digitizing conversion;
5) by DSP control circuit, the digital signal after conversion is modified, deletes, strengthened, and be sent to host computer;
6) host computer sends new instruction to DSP control circuit and feeds back to adjustable gain amplification module.
Above content is the further description done the present invention in conjunction with concrete preferred implementation, and being convenient to these those skilled in the art can understand and apply the invention, and can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, some simple deduction or replace can also be made without departing from the inventive concept of the premise, and need not through performing creative labour.Therefore, those skilled in the art are according to announcement of the present invention, and the simple modifications made the present invention all should within protection scope of the present invention.
Claims (7)
1. one kind wide dynamic capacitive apparatus leakage current sensor monitoring system, it is characterized in that: comprise DSP control circuit, adjustable gain amplification module, inductive coil, A/D module, described sensing coil is arranged on capacitive apparatus ground wire, the electric current that inductive coil produces is sent to adjustable gain amplification module, adjustable gain amplification module is unidirectional is connected to A/D module, the simulating signal of adjustable gain amplification module is sent to A/D module and carries out digitizing conversion, described A/D module is unidirectional is connected to DSP control circuit, the digitized signal that A/D module exports is delivered to DSP control circuit, digital signal is modified, delete, strengthening.
2. wide dynamic capacitive apparatus leakage current sensor monitoring system according to claim 1, it is characterized in that: be provided with photoelectric isolation module between described inductive coil and adjustable gain amplification module, the Signal separator for being produced by inductive coil is light signal and electric signal.
3. wide dynamic capacitive apparatus leakage current sensor monitoring system according to claim 1, is characterized in that: described DSP control circuit is unidirectional is connected to adjustable gain amplification module.
4. wide dynamic capacitive apparatus leakage current sensor monitoring system according to claim 1, it is characterized in that: described DSP control circuit, A/D module, adjustable gain amplification module are connected respectively to power module, by power module be DSP control circuit, A/D module, adjustable gain amplification module provide electric energy.
5. the wide dynamic capacitive apparatus leakage current sensor monitoring system according to claim 1 or 2 or 3 or 4, it is characterized in that: described adjustable gain amplification module is for adjusting amplification, the minification of the simulating signal received, and the simulating signal that it is exported is in the detection range ability of A/D module.
6. the wide dynamic capacitive apparatus leakage current sensor monitoring system according to claim 1 or 2 or 3 or 4, is characterized in that: its concrete testing process is:
1) inductive coil detects the electric current on capacitive apparatus ground wire, as no signal current on capacitive apparatus ground wire, then and inductive coil not generation current, if any electric current, then inductive coil generation current;
2) current signal produced by inductive coil by photoelectric isolation module carries out photodetachment;
3) adjustable gain amplification module is analyzed the electric signal received:
4) by A/D module, the electric signal received is carried out digitizing conversion;
5) by DSP control circuit, the digital signal after conversion is modified, deletes, strengthened, and be sent to host computer;
6) host computer sends new instruction to DSP control circuit and feeds back to adjustable gain amplification module.
7. wide dynamic capacitive apparatus leakage current sensor monitoring system according to claim 6, it is characterized in that: the concrete analysis process of step 3 is: if electric signal value range is in the detection range ability of A/D module, then direct this electric signal is transferred to A/D module by adjustable gain amplification module; If electric signal value range is less than the detection range ability of A/D module, then this electric signal is transferred to A/D module after in adjustable gain amplification module gain to the detection range ability of A/D module; If electric signal value range is greater than the detection range ability of A/D module, then this electric signal is transferred to A/D module after in adjustable gain amplification module gain to the detection range ability of A/D module.
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| CN201310224832.7A CN104237599A (en) | 2013-06-07 | 2013-06-07 | Width dynamic capacitive equipment leakage current sensor monitoring system |
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| CN201310224832.7A CN104237599A (en) | 2013-06-07 | 2013-06-07 | Width dynamic capacitive equipment leakage current sensor monitoring system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105911336A (en) * | 2016-04-27 | 2016-08-31 | 国家电网公司 | Bus leakage current detection apparatus |
| CN105911335A (en) * | 2016-04-27 | 2016-08-31 | 国家电网公司 | New type bus leakage current detection system |
| CN105954638A (en) * | 2016-04-27 | 2016-09-21 | 国家电网公司 | Busbar current leakage detection apparatus with input protection |
| WO2017190303A1 (en) * | 2016-05-05 | 2017-11-09 | Honeywell International Inc. | Total dissolved solid sensor with dynamic gain |
| WO2018165970A1 (en) * | 2017-03-17 | 2018-09-20 | 浙江巨磁智能技术有限公司 | Leakage current sensor, and apparatus for monitoring leakage current |
| CN108872698A (en) * | 2018-06-29 | 2018-11-23 | 天津敬慎坊科技有限公司 | A kind of data collection system |
| CN111289919A (en) * | 2020-04-03 | 2020-06-16 | 广州市扬新技术研究有限责任公司 | Multi-range contact net leakage current detection device |
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| JPH0627165A (en) * | 1992-07-09 | 1994-02-04 | Toyo Commun Equip Co Ltd | Method and device for automatically adjusting sensitivity of current transformer for detecting leakage current |
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2013
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| JPH0627165A (en) * | 1992-07-09 | 1994-02-04 | Toyo Commun Equip Co Ltd | Method and device for automatically adjusting sensitivity of current transformer for detecting leakage current |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105911336A (en) * | 2016-04-27 | 2016-08-31 | 国家电网公司 | Bus leakage current detection apparatus |
| CN105911335A (en) * | 2016-04-27 | 2016-08-31 | 国家电网公司 | New type bus leakage current detection system |
| CN105954638A (en) * | 2016-04-27 | 2016-09-21 | 国家电网公司 | Busbar current leakage detection apparatus with input protection |
| WO2017190303A1 (en) * | 2016-05-05 | 2017-11-09 | Honeywell International Inc. | Total dissolved solid sensor with dynamic gain |
| WO2018165970A1 (en) * | 2017-03-17 | 2018-09-20 | 浙江巨磁智能技术有限公司 | Leakage current sensor, and apparatus for monitoring leakage current |
| CN108872698A (en) * | 2018-06-29 | 2018-11-23 | 天津敬慎坊科技有限公司 | A kind of data collection system |
| CN111289919A (en) * | 2020-04-03 | 2020-06-16 | 广州市扬新技术研究有限责任公司 | Multi-range contact net leakage current detection device |
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Application publication date: 20141224 |
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