CN102628890B - Intelligent grounding safety parameter monitoring method and device - Google Patents

Intelligent grounding safety parameter monitoring method and device Download PDF

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Publication number
CN102628890B
CN102628890B CN201210115923.2A CN201210115923A CN102628890B CN 102628890 B CN102628890 B CN 102628890B CN 201210115923 A CN201210115923 A CN 201210115923A CN 102628890 B CN102628890 B CN 102628890B
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China
Prior art keywords
current
voltage
earthing
safety parameter
electric current
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CN201210115923.2A
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Chinese (zh)
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CN102628890A (en
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李景禄
郑晖
李既明
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李景禄
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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

Intelligent grounding safety parameter monitoring method and device

Technical field

The present invention is mainly concerned with widely used earthing device security parameter monitoring method and device in electrical network, touch voltage and the current value of grounding apparatus while being used for measuring power frequency short circuit, the attached subaerial step voltage of earthing device and current value, and judge whether earthing device exists security risk and degree of risk in the time of different crowd.

Background technology

In the time there is electric system generation ground short circuit fault, on electrical equipment shell, there will be high touch voltage and pickup current, on the ground of earthing device, can produce step voltage and the electric current that strides, 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 earthing device should carry out step voltage, the measurement of stride current measurement and ground potential distribution.

In the past in the time measuring touch voltage and step voltage, all to measure in strict accordance with code DL-475-92 " the measurement directive/guide 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 to grounding apparatus, be the sheet metal of the bipod of placing mold personification on the ground at 0.6m place from power equipment horizontal range, resistance R m(1500 that will simulation human body ) to be attempted by along the liftoff vertical range of device housings, framework or wall be between 1.8m place and sheet metal, the magnitude of voltage of measuring Rm with voltage table is touch voltage value; The measuring method of step voltage is: measuring current is injected in the place that may flow into earthing device at earth short circuit current, by the resistance R m(1500 of simulation human body ) be attempted by between 2 that on ground, horizontal range is 1m, the magnitude of voltage of measuring Rm with voltage table is touch voltage value.In the past when each measurement, all wiring in order: sheet metal, resistance R m, reometer, voltage table, device is not integrated cause testing loaded down with trivial details.When transmission line of electricity ground short circuit, the impact of tower grounding device on personal safety, also there is no corresponding test method and control criterion, is step voltage and touch voltage about the safety index of generating plant, substation ground device, and the computing formula of step voltage desired value is: ; The desired value computing formula of touch voltage is: , in formula -step voltage, unit, V; -touch voltage, unit, V; -topsoil Bad resistivity, unit, ; The duration of t-earth short circuit current, unit, s.In target formula, the permissible value of step voltage and touch voltage is all directly related with the resistivity of upper layer of soil, but do not specify 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 affects personal safety.For earthing device, can there is maximum stride current locus envelope in the certain scope of its periphery, the size of the electric current that strides on maximum stride current locus envelope, can truly reflect whether safety of earthing device, find out maximum stride current locus envelope also can be grounding safety transformation foundation is provided simultaneously, therefore we propose by maximum stride current locus envelope theory is that foundation is studied on-the-spot grounding safety test methodresearch electric power line pole tower earthing device safety control standed, research has even diffusing and all presses the novel shaft tower safety ground method of effect and key sections transmission line of electricity grounding safety safeguard procedures to have extremely important theory value, engineering using value and social value.

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 are designed, not only can measure touch voltage and the pickup current of generating plant, Electrical Equipment for Substation, ground step voltage and the electric current that strides, but also can measure easily touch voltage and the pickup current of transmission line of electricity, and the attached subaerial step voltage of shaft tower and the electric current that strides, find maximum stride voltage trace envelope, and determine whether and have security risk, for grounding safety transformation provides foundation targetedly.

The technical solution used in the present invention 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.

By power current generator, tested earthing device is injected after earthmeter electric current, utilize contact resistance and the resistance that strides of its adjustable resistor device simulation human body, pass through current sensor, voltage sensor gathers touch voltage and the pickup current of tested grounding apparatus, and different directions gathers step voltage and the electric current that strides at interval of 1m along tested earthing device ground, sampled result is become to actual earth short circuit current by computer processor unit experiment current conversion, and draw out the potential image in each orientation and the track enveloping curve of maximum stride voltage and maximum stride electric current, compare with standard, detect grounding safety parameter and whether have security risk, and degree of risk and position.

As a further improvement on the present invention:

Adjustable resistor device of the present invention is made up of adjustable resistance and two outer extension lines.

Computer processor unit of the present invention is made up of an alternating voltage sampling circuit, alternating current sample circuit, CPU and a display screen.

The present invention adopts computer processor unit, can be by the test data reduction in when test to actual earth short circuit current, and draw out near the potential image in each orientation, the ground of earthing device and the track envelope of maximum stride voltage and maximum stride electric current, and compare and judge whether to exist security risk with standard.

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 to an instrument internal, easy to operate, be convenient to mobile.Secondly, can directly judge earthing device according to the result of computer processor unit and whether have security risk in ground around, assessment accurately fast.

Brief description of the 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 sampling 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 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.In the time measuring touch voltage and electric current, measuring current should be injected earthing device above from electrical equipment shell 1.8m, and in the time measuring step voltage and stride electric current, measuring current should be any local injection of earthing device.According to code DL-475-92 " the measurement directive/guide of earthing device power frequency characterisitic parameter ", it is 0.6m place that the measurement of touch voltage should be the horizontal range from power equipment on the ground, 2 voltages that bear of the human body that is 1.8m place along the liftoff vertical range of device housings, framework or wall contact; The measurement of step voltage should be 2 voltages that bear of human body bipod contact that horizontal range is 1m on the ground.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 and the resistance that strides, by the span between adjusting resistance value size and outer extension line just can simulate all ages and classes, height, the variation of the personal parameter such as stride and tentacle height that strides.

The measurement data of current sensor and voltage sensor is delivered to the input end of sample circuit, Fig. 4 is computer processor unit alternating voltage sampling circuit figure, system voltage is after corresponding sensor, the unified voltage signal that is transformed to suitable amplitude, after modulate circuit, carry out A/D conversion, the sample circuit of system output voltage is made up of four parts as we know from the figure, the voltage follower that Part I is made up of the amplifier of LF353, R131 and C101 disturb in order to suppress.Part II is level lifting circuit, will be unipolar signal around the signal boost of zero level fluctuation, and Part III is followed, and Part IV is the protection part entering before A/D, prevents that abnormal signal from causing dsp chip to damage.Fig. 5 is computer processor unit alternating current sample circuit figure, Part I is the accurate sampling resistor chi of flowing through after capacitor C 4 filtering, current signal is transformed to voltage signal, the phase inverter that Part II is made up of amplifier, Part III is clamp amplitude limiter circuit, to ensure that output voltage signal, at 0-3V, meets A/D input reference signal.Fig. 6 is computer processor unit sampled data analyzing and processing figure, can automatically convert sampled data to actual earth short circuit current and voltage, and draw out near the potential image in each orientation, ground earthing device and the envelope of maximum stride voltage and maximum stride electric current, can judge in the time of the personal parameter of difference ground around earthing device and whether have security risk, and find the safety-optimized structure of earthing device corresponding to different places.

Fig. 7 is process flow diagram of the present invention.When start, first system is carried out to initialization, State selective measurements shelves (electric current and voltage or pickup current or voltage stride), next start to measure, by sensor image data, send into sampling apparatus, and by computing machine, sampled signal is analyzed and processed, finally analysis result is exported on display.

Claims (2)

1. an intelligent grounding safety parameter monitoring method, the method application adjustable resistor device (1), current sensor (2), voltage sensor (3), computer processor unit (4) forms monitoring device, it is characterized in that: by current feedback circuit, tested earthing device is injected and measured after electric current, utilize contact resistance and the resistance that strides of its adjustable resistor device (1) simulation human body, simulate all ages and classes by the span between adjusting resistance value size and outer extension line, the stride variation of the personal parameter such as stride and tentacle height of the human body of height, gather step voltage and the electric current that strides, sampled result is processed by computer processor unit (4), after being become to actual earth short circuit current, experiment current conversion draws maximum stride voltage, maximum stride electric current enveloping curve, and compare with relevant criterion, show that whether grounding safety parameter is qualified, whether there is security risk.
2. the intelligent grounding safety parameter monitoring of one according to claim 1 method, it is characterized in that: computer processor unit (4) will detect after data and the actual automatic comparison operation of earth short circuit current, export drafting by computer printout, and show near the potential image in each orientation, ground earthing device and the envelope of maximum stride voltage and maximum stride electric current, show that whether grounding safety parameter is qualified, measure and judge whether ground exists security risk around earthing device, and find risk coordinate position, for earthing device transformation and optimal design provide foundation.
CN201210115923.2A 2012-04-19 2012-04-19 Intelligent grounding safety parameter monitoring method and device CN102628890B (en)

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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
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
CN107329015B (en) * 2017-07-04 2020-04-21 李景禄 Human safety simulation test method and device

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Denomination of invention: Intelligent grounding safety parameter monitoring method and device

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