CN102901857A - Measuring method for step voltage and contact voltage - Google Patents
Measuring method for step voltage and contact voltage Download PDFInfo
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- CN102901857A CN102901857A CN2012103866948A CN201210386694A CN102901857A CN 102901857 A CN102901857 A CN 102901857A CN 2012103866948 A CN2012103866948 A CN 2012103866948A CN 201210386694 A CN201210386694 A CN 201210386694A CN 102901857 A CN102901857 A CN 102901857A
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Abstract
The embodiment of the invention discloses a measuring method for a step voltage and a contact voltage. The measuring method comprises the following steps: a power supply is connected in a grounding device and a current pile in a preset position, wherein a set frequency is equal to the subtraction of the power supply and a power frequency; the two ends of a first human body artificial resistor are set to keep a fixed preset distance; the two ends of the first human body artificial resistor are grounded between the grounding device and a current pile; the grounding device, the current pile and the two ends of the first human body artificial resistor are in straight-line distribution; the step voltage at the two ends of the first human body artificial resistor is measured by a frequency-selecting voltage meter; one end of a second human body artificial resistor is connected with the grounding device while the other end of the second human body artificial resistor is grounded in a place which keeps the set distance with the grounding device; and the grounding device, the current pile and the grounding end of the second human body artificial resistor are in straight-line distribution. According to the embodiment of the measuring method, the size of the measured power supply is effectively reduced and the work intensity of a tester is alleviated.
Description
Technical field
The present invention relates to power domain, more particularly, relate to a kind of step voltage and touch voltage measuring method.
Background technology
When electrical equipment comprises earthing pole, electric current can be by the earthing pole outflow that scatters, form different Potential distribution around earthing pole, step voltage refers to enter at the ground current of electrical equipment the people of place Potential distribution district walking on every side, the voltage between its bipod.
Transformer station when the step voltage around its earthing device surpasses the safe voltage value, can directly threaten substation operation personnel, substation equipment maintenance and repair personnel personal safety as the high voltage electric equipment that typically has earthing pole; Must strengthen energetically the periodic monitoring to the earth mat step voltage.
In the prior art, the general measurement of adopting the power frequency heavy-current method to come grounding apparatus is carried out step voltage, owing to being subjected to system to flow into the interference of earth mat electric current and the interference between the test lead line, so in the prior art, rules require when measuring, test current must not be less than 50A with the impact of reduce disturbance on measurement result, thus, testing equipment has just appearred heavy, the problems such as process of the test is complicated, and the testing crew working strength is large.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of step voltage and touch voltage measuring method.
The embodiment of the invention is achieved in that
The measuring method of a kind of step voltage and touch voltage is characterized in that, comprising:
At earthing device be located at the power supply that the stake access of predeterminated position electric current and power frequency differ setpoint frequency;
The two ends of the first n-body simulation n resistance are set to have fixing predeterminable range;
Between earthing device and described electric current stake with the two-terminal-grounding of described the first n-body simulation n resistance; The two ends of described earthing device, electric current stake and described the first n-body simulation n resistance linearly distribute;
Measure the step voltage at described the first n-body simulation n resistance two ends by frequency selective voltmeter;
One end of the second human body simulation resistance is connected with earthing device, the other end with apart from the ground grounding connection of earthing device setpoint distance; The earth terminal of described earthing device, electric current stake and described the second human body simulation resistance linearly distributes; It highly is apart from 1.8 meters on ground that described the second human body simulation resistance is connected with earthing device.
Measure the touch voltage at described the second human body simulation resistance two ends by frequency selective voltmeter.
Preferably, in embodiments of the present invention, described setpoint frequency is 5 hertz.
Preferably, in embodiments of the present invention, the resistance value of described electric current stake is less than 80 ohm.
Preferably, in embodiments of the present invention, also comprise, when installing described electric current stake, water at the installation position of described electric current stake.
Preferably, in embodiments of the present invention, the supply current of described power supply is 1 to 5 ampere.
Preferably, in embodiments of the present invention, the electric current of described power supply is set to sine wave.
Preferably, in embodiments of the present invention, the length of embedment of described electric current stake is greater than 0.5 meter.
Can find out from above-mentioned technical scheme, in embodiments of the present invention, by earthing device, electric current stake and human body simulation resistance straight line are arranged, and adopt the electric current measurement of non-power frequency stride resistance and contact resistance.Because adopting the electric current of non-power frequency measures, so avoided the interference of power frequency to measurement result, so also just needn't adopt measuring of large electric current, because the volume of low current power supply is little, easy and simple to handle, so the embodiment of the invention has reduced to measure the volume of power supply effectively, alleviated the working strength of testing crew.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic flow sheet of step voltage described in the embodiment of the invention and touch voltage measuring method;
Fig. 2 is that the installation of used each equipment in step voltage described in the embodiment of the invention and the touch voltage measuring method consists of schematic diagram.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
In the prior art, adopt the power frequency heavy-current method to come grounding apparatus is carried out the measurement of step voltage and touch voltage, in this mode, rules require test current less than 50A, thus, testing equipment just to have occurred heavy, the problems such as process of the test is complicated, and the testing crew working strength is large.
For this reason, as depicted in figs. 1 and 2, in embodiments of the present invention, provide the measuring method of a kind of step voltage and touch voltage, having comprised:
S11, at earthing device 1 be located at the power supply 3 that predeterminated position electric current stake 2 access and power frequency differ setpoint frequency;
In embodiments of the present invention, adopt the power supply 3 of power frequency different frequency, like this so that distinguished to some extent by power frequency and the power frequency in the Potential distribution district of this power generation between earthing device 1 and the electric current stake 2, thereby avoided the power frequency interference.
The two ends of S12, the first n-body simulation n resistance 4 are set to have fixing predeterminable range;
For the suffered voltage of the steplength of simulating human body, in embodiments of the present invention, with the standard to some extent of the distance between the two ends of human body simulation resistance 4, with the actual range near human body of trying one's best, concrete described predeterminable range can be 1 meter.
S13, between earthing device 1 and electric current stake 2 with the two-terminal-grounding of the first n-body simulation n resistance 4; The two ends of earthing device 1, electric current stake 2 and the first n-body simulation n resistance 4 linearly distribute;
For the two ends distance that makes human body simulation resistance 4 can be in the Potential distribution district of ground current acquisition maximum stride voltage, the two ends of earthing device 1, electric current stake 2 and the first n-body simulation n resistance 4 linearly need to be distributed.
S14, measure the step voltage at described the first n-body simulation n resistance 4 two ends by frequency selective voltmeter 5;
Because in embodiments of the present invention, adopted the power supply 3 of non-power frequency, so when measuring the step voltage that human body simulation resistance 4 produces, need to measure the electric current that the power supply 3 of non-power frequency produces by frequency selective voltmeter 5.Its frequency can configure accordingly according to the frequency of the power supply 3 of non-power frequency.
S15, an end of the second human body simulation resistance 6 is connected the other end and ground grounding connection apart from the earthing device setpoint distance with earthing device 1; The earth terminal of described earthing device 1, electric current stake 2 and described the second human body simulation resistance 6 linearly distributes; It highly is apart from 1.8 meters on ground that described the second human body simulation resistance 6 is connected with earthing device 1.
In order to measure touch voltage, in embodiments of the present invention, also be equipped with another person's n-body simulation n resistance, the voltage that is born when contacting earthing device 1 with the simulation personnel in the position of 1 one steplengths of distance earthing device.Concrete, the position that is connected with earthing device 1 can be the height of simulating human body, such as can being 1.8 meters.
S16, measure the touch voltage at described the second human body simulation resistance 6 two ends by frequency selective voltmeter 7.
Step voltage is similar with measuring, and when measuring touch voltage, need to measure the electric current that the power supply 3 of non-power frequency produces by frequency selective voltmeter 7.Its frequency can configure accordingly according to the frequency of the power supply 3 of non-power frequency.
In the prior art, step voltage and touch voltage the time, use power current to measure and can cause interference, so need to be enlarged to and just can obtain comparatively accurate result more than 50 amperes measuring electric current; Because the electric current more than 50 amperes need to be provided, institute is so that measurement device body is long-pending very large, and process of the test is complicated, and then so that experimenter's working strength is larger.
In the embodiment of the invention, adopt the electric current different from work frequency as measuring electric current, thereby greatly avoided the interference of power current, because it is less to be subject to the interference of power current, so just can obtain more accurate measurement result by less measurement electric current.In the practical application, before the step voltage in implementing the embodiment of the invention and the method for touch voltage, at first whether electric current line, pressure-wire and the earthing device of checking experiment have the situation of short circuit.In embodiments of the present invention, the frequency that differs setting with power frequency can be 5 hertz, because the frequency of power current is 50 hertz, so, that is to say that the measurement electric current in the embodiment of the invention can be 45 hertz or 55 hertz; Because measurement power frequency and power current frequency phase-difference in the embodiment of the invention are little, so the error of the result who records and actual result is very little, thereby so that net result is comparatively accurate.
From measure electric current in the prior art and need larger current value different with adopting power current, in embodiments of the present invention, can measure much smaller, concrete that electric current arranges, can be any current value in 1 ampere to 5 amperes.
In addition, in actual applications, the electric current that the embodiment of the invention specifically can power supply is set to sine wave.
In order to make measurement result more accurate, that need to avoid that the resistance of electric current stake arranges is excessive, and in embodiments of the present invention, in order to guarantee the accuracy of measurement result, resistance value that need to the electric current stake is set to less than 80 ohm.
Further, in embodiments of the present invention, fully contact the minimizing electric current stake of trying one's best and the contact resistance of the earth for what guarantee electric current stake and the earth, length of embedment that can the electric current stake is set to greater than 0.5 meter.
In addition, in embodiments of the present invention, when also being included in installing electric current stake, water at the installation position of described electric current stake.For the minimizing electric current stake of trying one's best after inserting ground with the contact resistance on ground, avoid affecting thus measurement result, can also when the stake of installing electric current, water in the position of electric current stake installing, thereby make the electric current stake more abundant with contacting of ground, and then effectively reduce the contact resistance between electric current stake and ground.
In sum, in embodiments of the present invention, by grounded screen, electric current stake and human body simulation resistance are linearly arranged, and adopt the electric current of non-power frequency to measure step voltage and touch voltage.Because adopting the electric current of non-power frequency measures, so avoided the interference of power frequency to measurement result, so also just needn't adopt measuring of large electric current, because the volume of low current power supply is little, easy and simple to handle, so the embodiment of the invention has reduced to measure the volume of power supply effectively, alleviated the working strength of testing crew.
Each embodiment adopts the mode of going forward one by one to describe in this instructions, and what each embodiment stressed is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, in other embodiments realization.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (8)
1. the measuring method of a step voltage and touch voltage is characterized in that, comprising:
At earthing device be located at the power supply that the stake access of predeterminated position electric current and power frequency differ setpoint frequency;
The two ends of the first n-body simulation n resistance are set to have fixing predeterminable range;
Between earthing device and described electric current stake with the two-terminal-grounding of described the first n-body simulation n resistance; The two ends of described earthing device, electric current stake and described the first n-body simulation n resistance linearly distribute;
Measure the step voltage at described the first n-body simulation n resistance two ends by frequency selective voltmeter;
One end of the second human body simulation resistance is connected with earthing device, the other end with apart from the ground grounding connection of earthing device setpoint distance; The earth terminal of described earthing device, electric current stake and described the second human body simulation resistance linearly distributes; It highly is apart from 1.8 meters on ground that described the second human body simulation resistance is connected with earthing device.
Measure the touch voltage at described the second human body simulation resistance two ends by frequency selective voltmeter.
2. described measuring method according to claim 1 is characterized in that, described setpoint frequency is 5 hertz.
3. described measuring method according to claim 2 is characterized in that, the resistance value of described electric current stake is less than 80 ohm.
4. described measuring method according to claim 3 is characterized in that, also comprises, when installing described electric current stake, waters at the installation position of described electric current stake.
5. described measuring method according to claim 4 is characterized in that, the supply current of described power supply is set to 1 to 5 ampere.
6. described ground resistance measurement method according to claim 5 is characterized in that, the electric current of described power supply is set to sine wave.
7. described measuring method according to claim 6 is characterized in that, the length of embedment of described electric current stake is greater than 0.5 meter.
8. described measuring method according to claim 7 is characterized in that, described predeterminable range is 1 meter.
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| CN2012103866948A CN102901857A (en) | 2012-10-12 | 2012-10-12 | Measuring method for step voltage and contact voltage |
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| CN2012103866948A CN102901857A (en) | 2012-10-12 | 2012-10-12 | Measuring method for step voltage and contact voltage |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106093534A (en) * | 2016-08-08 | 2016-11-09 | 三峡大学 | A kind of method testing earth mat step voltage and contact voltage |
| CN107329015A (en) * | 2017-07-04 | 2017-11-07 | 李景禄 | A kind of personal safety simulation test method and its device |
| CN109358225A (en) * | 2018-10-09 | 2019-02-19 | 沃尔特电子（苏州）有限公司 | A kind of detection device of detection circuit and trolleybus to the earth insulation performance |
| CN110045176A (en) * | 2019-03-20 | 2019-07-23 | 国网河南省电力公司电力科学研究院 | Industrial equipment contact voltage monitoring device and system |
| CN110648574A (en) * | 2019-09-30 | 2020-01-03 | 武汉大学 | Step voltage and contact voltage simulation experiment device and method |
| CN112014620A (en) * | 2020-07-31 | 2020-12-01 | 深圳供电局有限公司 | Step voltage simulator |
| CN112014619A (en) * | 2020-07-27 | 2020-12-01 | 深圳供电局有限公司 | Step voltage detection device, grounding system and step voltage detection method |
| CN112014618A (en) * | 2020-07-27 | 2020-12-01 | 深圳供电局有限公司 | Contact voltage detection device, grounding system and contact voltage detection method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106093534A (en) * | 2016-08-08 | 2016-11-09 | 三峡大学 | A kind of method testing earth mat step voltage and 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 |
| CN109358225A (en) * | 2018-10-09 | 2019-02-19 | 沃尔特电子（苏州）有限公司 | A kind of detection device of detection circuit and trolleybus to the earth insulation performance |
| CN110045176A (en) * | 2019-03-20 | 2019-07-23 | 国网河南省电力公司电力科学研究院 | Industrial equipment contact voltage monitoring device and system |
| CN110648574A (en) * | 2019-09-30 | 2020-01-03 | 武汉大学 | Step voltage and contact voltage simulation experiment device and method |
| CN112014619A (en) * | 2020-07-27 | 2020-12-01 | 深圳供电局有限公司 | Step voltage detection device, grounding system and step voltage detection method |
| CN112014618A (en) * | 2020-07-27 | 2020-12-01 | 深圳供电局有限公司 | Contact voltage detection device, grounding system and contact voltage detection method |
| CN112014620A (en) * | 2020-07-31 | 2020-12-01 | 深圳供电局有限公司 | Step voltage simulator |
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Application publication date: 20130130 |