CN102628890A - Intelligent grounding safety parameter monitoring method and device - Google Patents
Intelligent grounding safety parameter monitoring method and device Download PDFInfo
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- CN102628890A CN102628890A CN2012101159232A CN201210115923A CN102628890A CN 102628890 A CN102628890 A CN 102628890A CN 2012101159232 A CN2012101159232 A CN 2012101159232A CN 201210115923 A CN201210115923 A CN 201210115923A CN 102628890 A CN102628890 A CN 102628890A
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Abstract
The invention discloses an intelligent grounding safety parameter monitoring method and device. The intelligent grounding safety parameter monitoring device consists of an adjustable resistance device, a voltage sensor, a current sensor and a computer processing device, and is characterized in that: after grounding testing current is injected into a tested grounding device through a working frequency current generator, the adjustable resistance device is used for simulating the contact resistance and stepping resistance of a human body, the contact voltage and current of tested equipment are acquired through the voltage sensor and the current sensor, and stepping voltage and stepping current are acquired at the interval of 1 meter along different directions. A sampling result is automatically converted into practical grounding short circuit current through the computer processing device, and a potential distribution map at each position and track envelope lines of maximum stepping voltage and current are drawn through calculation. The intelligent grounding safety monitoring device has the characteristics of convenience for using and high practicability.
Description
Technical field
The present invention is mainly concerned with widely used earthing device security parameter monitoring method and device in the electrical network; The touch voltage of grounding apparatus and current value when being used to measure the power frequency short circuit; The step voltage and the current value on ground near the earthing device, and judge whether earthing device exists security risk and degree of risk when different crowd.
Background technology
When electric system generation ground short circuit fault takes place when; High touch voltage and pickup current can appear on the electrical equipment shell; On the ground of earthing device, can produce step voltage and stride electric current, if the life security of the excessive entail dangers to person of these parameters, for this reason; Must carry out touch voltage and pickup current to electrical equipment and measure, to the measurement that earthing device should carry out step voltage, stride current measurement and ground potential distribute.
In the past when measuring touch voltage and step voltage; All be to measure in strict accordance with rules DL-475-92 " the measurement guide rule of earthing device power frequency characterisitic parameter "; The measuring method that is touch voltage is: at framework or electrical equipment shell place measuring current is injected grounding apparatus; From the power equipment horizontal range is the sheet metal of placement anthropomorphic dummy's bipod on the ground at 0.6m place; Resistance R m (1500
with the simulation human body) to be attempted by along the liftoff vertical range of device housings, framework or wall be between 1.8m place and the sheet metal, is the touch voltage value with the magnitude of voltage of voltage table measure R m; The measuring method of step voltage is: measuring current is injected in the place that possibly flow into earthing device at earth short circuit current; Resistance R m (1500
with the simulation human body) being attempted by horizontal range on the ground is between 2 of 1m, is the touch voltage value with the magnitude of voltage of voltage table measure R m.In the time of each in the past the measurement, all wiring in order: sheet metal, resistance R m, reometer, voltage table, device be not integrated cause testing loaded down with trivial details.Transmission line is shorted to ground, tower grounding device for personal safety impact, there is no corresponding test methods and control standards, with regard to power plants, substations grounding device safety indicators are step and touch voltage, step voltage target value is calculated as:
; contact voltage target value is calculated as follows:
, where
- step voltage, unit, V;
- contact voltage, unit, V;
- Upper earthen resistivity, units,
; t-ground short-circuit current The duration of a, s.The permissible value of step voltage and touch voltage is all directly related with the resistivity of upper layer of soil in the target formula; But do not stipulate the thickness of upper layer of soil; The uncertainty that this just brings stride electric current and pickup current, in fact stride electric current and pickup current are only the direct parameter that influences personal safety.As far as earthing device; Can there be the maximum current locus envelope that strides in the certain scope of its periphery; The stride size of the electric current that strides on the current locus envelope of maximum can truly reflect whether safety of earthing device, finds out the maximum current locus envelope that strides simultaneously and also can be the grounding safety transformation foundation is provided; Therefore
We propose to use the maximum current locus envelope theory that strides to be according to the on-the-spot grounding safety test method of researchResearch electric power line pole tower earthing device security control standard, research have even diffusing stream and have extremely important theoretical value, practical applications value and social value with novel shaft tower safety ground method of all pressing effect and emphasis location transmission line of electricity grounding safety safeguard procedures.
Summary of the invention
The present invention is directed to the shortcoming of above-mentioned prior art; A kind of earthing device security parameter monitoring method and device of simple to operate and high intelligence have been designed; Not only can measure the touch voltage and the pickup current of generating plant, electric substation's electrical equipment, the ground step voltage and the electric current that strides, but also can measure the touch voltage and the pickup current of transmission line of electricity easily; And near the step voltage on the ground of shaft tower and the electric current that strides; Find maximum step voltage track envelope, and judge whether there is security risk, for the grounding safety transformation provides foundation targetedly.
The technical scheme that the present invention adopts is:
A kind of intelligent earthing device security parameter monitoring method and device comprise four parts: adjustable resistor device, current sensor, voltage sensor and computer processor unit.
After through the power current generator tested earthing device being injected the earthmeter electric current; Utilize the contact resistance and the resistance that strides of its adjustable resistor device simulation human body; Gather the touch voltage and the pickup current of tested grounding apparatus through current sensor, voltage sensor; And the different every interval 1m of direction in tested earthing device ground, edge gathers step voltage and strides electric current; Sampled result is become actual earth short circuit current to the experiment current conversion through computer processor unit, and draw out the potential image in each orientation and the track enveloping curve of maximum step voltage and the maximum electric current that strides, compare with standard; Detect the grounding safety parameter and whether have security risk, and degree of risk and position.
As further improvement of the present invention:
The adjustable resistor device that the present invention adopted is made up of adjustable resistance and two outer extension lines.
The computer processor unit that the present invention adopted is made up of an alternating voltage sample circuit, alternating current sample circuit, CPU and a display screen.
The present invention adopts computer processor unit; Can be with the test data reduction in when test to actual earth short circuit current; And draw out near potential image and the maximum step voltage in each orientation, the ground earthing device and the track envelope of the maximum electric current that strides, and compare with standard and to judge whether to exist security risk.
The present invention has following advantage:
The present invention takes integrated processing, and adjustable resistor device, current sensor, voltage sensor and computer processor unit are integrated in an instrument internal, and is easy to operate, be convenient to move.Secondly, can directly judge earthing device according to the result of computer processor unit and whether have security risk in ground on every side, assessment accurately fast.
Description of drawings
Fig. 1 is one-piece construction figure of the present invention;
Fig. 2 is step voltage of the present invention and electric current safety monitoring figure;
Fig. 3 is touch voltage of the present invention and electric current safety monitoring figure;
Fig. 4 is computer processor unit alternating voltage sample circuit figure of the present invention;
Fig. 5 is computer processor unit alternating current sample circuit figure of the present invention;
Fig. 6 is computer processor unit sampled data analyzing and processing figure of the present invention;
Fig. 7 is a process flow diagram of the present invention.
Embodiment
Fig. 1 is one-piece construction figure of the present invention; Fig. 2 is step voltage of the present invention and electric current safety monitoring figure, is applied to the safety monitoring of earthing device step voltage and electric current; Fig. 3 is touch voltage of the present invention and electric current safety monitoring figure, is applied to the measurement of earthing device touch voltage and pickup current.When measuring touch voltage and electric current, measuring current should be injected earthing device more than electrical equipment shell 1.8m, and when measuring step voltage and striding electric current, measuring current should be any local injection of earthing device.According to rules DL-475-92 " the measurement guide rule of earthing device power frequency characterisitic parameter "; It is the 0.6m place that the measurement of touch voltage should be the horizontal range that leaves power equipment on the ground, is 2 voltages that born of human body contact at 1.8m place along the liftoff vertical range of device housings, framework or wall; The measurement of step voltage should be on the ground, and horizontal range is 2 voltages that born of human body bipod contact of 1m.But the present invention is in order to reach the experimental study requirement to all groups; With the contact resistance of adjustable resistor device simulation human body with stride resistance, through the span between adjustment resistance value size and outer extension line just can simulate all ages and classes, height, the variation of the personal parameters such as stride and tentacle height that stride.
The measurement data of current sensor and voltage sensor is delivered to the input end of sample circuit, and Fig. 4 is computer processor unit alternating voltage sample circuit figure, and system voltage is through behind the corresponding sensor; The unified voltage signal that is transformed to suitable amplitude; Behind modulate circuit, carry out A/D conversion, can know that from figure the sample circuit of system's output voltage is made up of four parts; The voltage follower that first is made up of the amplifier of LF353, R131 and C101 are to disturb in order to suppress.Second portion is a level lifting circuit, will be unipolar signal around the signal boost of zero level fluctuation, and third part is followed, and the 4th part prevents that for getting into the preceding protection part of A/D abnormal signal from causing dsp chip to damage.Fig. 5 is computer processor unit alternating current sample circuit figure; First is the accurate sampling resistor chi of after capacitor C 4 filtering, flowing through; Current signal is transformed to voltage signal, the phase inverter that second portion is made up of amplifier, third part is the clamp amplitude limiter circuit; To guarantee that output voltage signal at 0-3V, satisfies the A/D input reference signal.Fig. 6 is computer processor unit sampled data analyzing and processing figure; Can convert sampled data to actual earth short circuit current and voltage automatically; And draw out near potential image and the maximum step voltage in each orientation, the ground earthing device and the envelope of the maximum electric current that strides; Can judge whether earthing device exists security risk in ground on every side when the personal parameter of difference, and find corresponding to the safety-optimized structure of the earthing device of different places.
Fig. 7 is a process flow diagram of the present invention.During start; Earlier system is carried out initialization, select to measure shelves (electric current and voltage or pickup current or voltage stride), next begin to measure; By the sensor acquisition data; Send into sampling apparatus, and sampled signal is analyzed and handled, at last analysis result is exported on display by computing machine.
Claims (3)
1. an intelligent grounding safety parameter monitoring method and apparatus comprises an adjustable resistor device (1), current sensor (2), voltage sensor (3), computer processor unit (4); It is characterized in that through current feedback circuit to tested earthing device inject measure electric current after; Utilize the contact resistance and the resistance that strides of its adjustable resistor device (1) simulation human body; Gather the pickup current and the touch voltage of tested grounding apparatus through current sensor (2), voltage sensor (3); And the different every interval 1m of direction in tested earthing device ground, edge gathers step voltage and strides electric current; Sampled result is handled through computer processor unit (4), drawn maximum step voltage enveloping curve testing after current conversion becomes actual earth short circuit current, and do comparison with relevant criterion; Whether qualified, be to have security risk if drawing the grounding safety parameter.
2. intelligent earthing device safety monitoring method according to claim 1 and device; It is characterized in that: its adjustable resistor device (1) is made up of adjustable resistance and two outer extension lines; Span through between adjustment resistance value size and outer extension line is simulated all ages and classes, height, the variation of the personal parameters such as stride and tentacle height that stride, to reach the experimental study requirement to all groups.
3. intelligent earthing device safety prison method according to claim 1 and device; Computer processor unit (4) it is characterized in that: after will detect the automatic comparison operation of earth short circuit current of data and reality; Draw through computer printout output, and show near the potential image in each orientation, ground of earthing device and the envelope of maximum step voltage and the maximum electric current that strides, and do comparison with relevant criterion; Whether draw the grounding safety parameter qualified; Measure and to judge also whether ground exists security risk around earthing device, and find the risk coordinate position, for earthing device transformation and optimal design foundation is provided.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879688A (en) * | 2012-10-12 | 2013-01-16 | 宁波市鄞州供电局 | Test system for grounding grid |
| CN104914295A (en) * | 2014-03-10 | 2015-09-16 | 广东易事特电源股份有限公司 | AD voltage conditioning circuit |
| CN106093534A (en) * | 2016-08-08 | 2016-11-09 | 三峡大学 | A kind of method testing earth mat step voltage and contact voltage |
| CN106291067A (en) * | 2016-10-28 | 2017-01-04 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of step voltage method of testing of extra-high voltage direct-current vertical grounding electrode |
| CN106549308A (en) * | 2016-11-22 | 2017-03-29 | 国网山东省电力公司东营供电公司 | A kind of circuit interrupter grounding device and method |
| CN107121590A (en) * | 2017-04-28 | 2017-09-01 | 国网河南省电力公司电力科学研究院 | A kind of step voltage and the wireless mapping system of contact voltage |
| CN107329015A (en) * | 2017-07-04 | 2017-11-07 | 李景禄 | A kind of personal safety simulation test method and its device |
| CN111983289A (en) * | 2020-08-06 | 2020-11-24 | 云南电网有限责任公司红河供电局 | Device and method for monitoring step potential difference and contact potential difference of large grounding grid |
| CN112083251A (en) * | 2020-09-18 | 2020-12-15 | 西南交通大学 | Human internal organ electrical loss risk assessment method considering various shapes |
| CN112415245A (en) * | 2020-11-23 | 2021-02-26 | 云南电网有限责任公司临沧供电局 | Leakage protection switch and step voltage detection device tester |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879688A (en) * | 2012-10-12 | 2013-01-16 | 宁波市鄞州供电局 | Test system for grounding grid |
| CN104914295A (en) * | 2014-03-10 | 2015-09-16 | 广东易事特电源股份有限公司 | AD voltage conditioning circuit |
| CN106093534A (en) * | 2016-08-08 | 2016-11-09 | 三峡大学 | A kind of method testing earth mat step voltage and contact voltage |
| CN106291067A (en) * | 2016-10-28 | 2017-01-04 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of step voltage method of testing of extra-high voltage direct-current vertical grounding electrode |
| CN106291067B (en) * | 2016-10-28 | 2019-01-04 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of step voltage test method of extra-high voltage direct-current vertical grounding electrode |
| CN106549308A (en) * | 2016-11-22 | 2017-03-29 | 国网山东省电力公司东营供电公司 | A kind of circuit interrupter grounding device and method |
| CN107121590A (en) * | 2017-04-28 | 2017-09-01 | 国网河南省电力公司电力科学研究院 | A kind of step voltage and the wireless mapping system of contact voltage |
| CN107329015A (en) * | 2017-07-04 | 2017-11-07 | 李景禄 | A kind of personal safety simulation test method and its device |
| CN107329015B (en) * | 2017-07-04 | 2020-04-21 | 李景禄 | Human safety simulation test method and device |
| CN111983289A (en) * | 2020-08-06 | 2020-11-24 | 云南电网有限责任公司红河供电局 | Device and method for monitoring step potential difference and contact potential difference of large grounding grid |
| CN112083251A (en) * | 2020-09-18 | 2020-12-15 | 西南交通大学 | Human internal organ electrical loss risk assessment method considering various shapes |
| CN112415245A (en) * | 2020-11-23 | 2021-02-26 | 云南电网有限责任公司临沧供电局 | Leakage protection switch and step voltage detection device tester |
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| CN102628890B (en) | 2014-12-03 |
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Application publication date: 20120808 Assignee: CHANGSHA XINCHANG ELECTRIC POWER SCIENCE & TECHNOLOGY CO., LTD. Assignor: Li Jinglu Contract record no.: 2015430000011 Denomination of invention: Intelligent grounding safety parameter monitoring method and device Granted publication date: 20141203 License type: Exclusive License Record date: 20150326 |
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Effective date of registration: 20160930 Address after: 410011 No. 9, No. 188, No. four, 204 Middle East environmental protection road, Yuhua District, Hunan, Changsha Patentee after: CHANGSHA XINCHANG ELECTRIC POWER SCIENCE & TECHNOLOGY CO., LTD. Address before: 302, room 22, building 9, 410076 Leng Ling Road, Tianxin District, Hunan, Changsha Patentee before: Li Jinglu |
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