CN102879688A - Test system for grounding grid - Google Patents

Test system for grounding grid Download PDF

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Publication number
CN102879688A
CN102879688A CN2012103866914A CN201210386691A CN102879688A CN 102879688 A CN102879688 A CN 102879688A CN 2012103866914 A CN2012103866914 A CN 2012103866914A CN 201210386691 A CN201210386691 A CN 201210386691A CN 102879688 A CN102879688 A CN 102879688A
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CN
China
Prior art keywords
pile
voltage
stake
resistance
current
Prior art date
Application number
CN2012103866914A
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Chinese (zh)
Inventor
朱瑾
王勇光
卢雷
任伟宏
吴明
刘亮泽
Original Assignee
宁波市鄞州供电局
国家电网公司
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Priority to CN2012103866914A priority Critical patent/CN102879688A/en
Publication of CN102879688A publication Critical patent/CN102879688A/en

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Abstract

The embodiment discloses a test system for a grounding grid. The test system comprises piles, a power supply forming a set frequency difference with power frequency, human body simulation resistors, a parameter acquisition device and an arithmetic device. The piles comprise current piles and voltage piles. The parameter acquisition device is used for acquiring current values of the current piles and voltage values of the voltage piles, acquiring a distance between a first pile and a second pile and a distance and a resistance value between the second pile and a third pile, and acquiring voltage values at the two ends of each of a first human body simulation resistor and a second human body simulation resistor, wherein the current values of the current piles and the voltage values of the voltage piles are measured according to a straight-line method; and the distance between the first and second piles and the distance and the resistance value between the second and third piles are measured according to a quadrupole equal-interval method. The arithmetic device is used for calculating grounding resistance, soil resistivity, contact resistance and step resistance according to a set formula. Non-power frequency current is used for testing, so that the interference of the power frequency to the measurement current is avoided, the adoption of heavy current for measurement is not required, and the size of the measurement power supply is reduced.

Description

A kind of grounded screen pilot system

Technical field

The present invention relates to power domain, more particularly, relate to a kind of grounded screen pilot system.

Background technology

In the last few years, the formed expansion accident of domestic many places transformer station, most grounded screens itself with and peripheral electric attribute defective relevant, such as, when stake resistance is excessive when then earth fault occuring, neutral point voltage skew is increased, may make mutually sound and neutral point voltage too high, above the level of insulating requirements and cause damage of equipment.Stake resistance is excessive, and except the resistivity of grounded screen own is excessive, and the soil resistivity of grounded screen periphery also has close relationship.In addition, when the step voltage around the grounded screen surpasses the safe voltage value, can directly threaten substation operation personnel, substation equipment maintenance and repair personnel personal safety.

Whether the stake resistance of earthed system is qualified is directly connected to substation operation personnel, substation equipment maintenance and repair personnel personal safety; Because soil has corrosive attack to earthing device, along with the lengthening of working time, the existing corrosion of earthing device affects the safe operation of transformer station; In addition, the soil of grounded screen periphery knot causes the variation of soil resistivity also can affect the ground connection performance of grounded screen; Therefore, must strengthen energetically periodic monitoring to earth mat.

In the prior art, generally adopt the power frequency heavy-current method to come that grounding apparatus is carried out grounded screen and test, obtain the stake resistance of grounded screen, the soil resistivity of grounded screen periphery and the parameters such as step voltage of grounded screen periphery, to judge the security of grounded screen.Owing to be 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 testing, test current must not be less than 50A with the impact of reduce disturbance on measurement result, thus, the problems such as it is heavy testing equipment just to have occurred, and 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 grounded screen pilot system.

The embodiment of the invention is achieved in that

A kind of grounded screen pilot system comprises: pile, differ power supply, human body simulation resistance, parameter obtaining device and the arithmetic unit of setpoint frequency with power frequency;

Described pile comprises electric current stake and voltage stake;

Parameter obtaining device is used for obtaining the current value of the described electric current stake that records according to straight-line method and the magnitude of voltage of described voltage stake, and, be used for obtaining the first pile of recording according to four utmost point method of equal intervals and distance and the resistance value between the distance between the second pile, described the second pile and the 3rd pile, and, for the magnitude of voltage that obtains respectively the first n-body simulation n resistance and the second human body simulation resistance two ends;

Described arithmetic unit is used for calculating stake resistance, soil resistivity, contact resistance and the resistance that strides according to described current value, magnitude of voltage, distance and resistance value that the formula of setting calculates and obtains.

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, the resistance value of described voltage stake is less than 200 ohm.

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, be sinusoidal wave with the electric current of described power supply.

Preferably, in embodiments of the present invention, the length of embedment of described electric current stake is greater than 0.5 meter.

Preferably, in embodiments of the present invention, the length of embedment of described voltage stake is greater than 0.5 meter.

Preferably, in embodiments of the present invention, the distance between described the first pile and the second pile is 5m, 10m, 20m, 30m or 40m.

Can find out from above-mentioned technical scheme, in embodiments of the present invention, when carrying out the test of stake resistance, soil resistivity, touch voltage and step voltage, and adopt the electric current of non-power frequency to measure the resistance of earthing device.Because adopting the electric current of non-power frequency measures, so avoided power frequency to measuring the interference of electric current, 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 that grounded screen pilot system described in the embodiment of the invention is in the connection diagram of carrying out ground resistance test;

Fig. 2 is that grounded screen pilot system described in the embodiment of the invention is in the connection diagram of carrying out the soil resistivity test;

Fig. 3 is that grounded screen pilot system described in the embodiment of the invention is in the connection diagram of carrying out the test of step voltage and touch voltage.

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 every test, in this mode, rules require test current less than 50A, thus, the testing equipment heaviness just to have occurred, the problems such as process of the test is complicated, and the testing crew working strength is large.

For this reason, in embodiments of the present invention, provide a kind of grounded screen pilot system, having comprised: pile, differed power supply, human body simulation resistance, parameter obtaining device and the arithmetic unit of setpoint frequency with power frequency; Pile comprises electric current stake and voltage stake;

Parameter obtaining device is used for obtaining the current value of the electric current stake that records according to straight-line method and the magnitude of voltage of voltage stake, and, be used for obtaining the first pile of recording according to four utmost point method of equal intervals and distance and the resistance value between the distance between the second pile, the second pile and the 3rd pile, and, for the magnitude of voltage that obtains respectively the first n-body simulation n resistance and the second human body simulation resistance two ends;

Arithmetic unit is used for calculating stake resistance, soil resistivity, contact resistance and the resistance that strides according to current value, magnitude of voltage, distance and resistance value that the formula of setting calculates and obtains.

As shown in Figure 1, when the stake resistance of grounded screen is tested, need first electric current stake 1 and voltage stake 2 to be set to be same lineal layout with grounded screen 3; Then, electric current stake 1 and the distance at grounded screen 3 edges are set to 4 to 5 times of tested grounded screen catercorner length, and the distance of voltage stake 2 and ground network edge is electric current stake 1 and 0.5 to 0.6 times of the distance at grounded screen 3 edges; After setting voltage stake and electric current stake, will differ with power frequency the power supply 4 anodal grounded screens 3 that are connected of setpoint frequency, negative pole connects electric current stake 1; After power supply 4 power supply, what parameter obtaining device was concrete can be multimeter, and the current value of the electric current stake 1 that can record by multimeter and the magnitude of voltage of voltage stake 2 are the resistance value of calculation of parameter grounded screen 3.

At last, can pass through arithmetic unit, the current value and the magnitude of voltage that calculate and obtain according to the formula of setting calculate stake resistance.

As shown in Figure 2, when the periphery to grounded screen carries out the soil resistivity test, need to use four piles, concrete, pile can be electric current stake or voltage stake.Concrete mode is, with the first pile 21, the second pile 22, the 3rd pile 23 and the 4th pile 24 in same lineal layout setting and be driven underground, the distance between described the first pile 21 and the second pile 22 be made as with the 3rd pile 23 and the 4th pile 24 between distance equate; The degree of depth that the first pile 21, the second pile 22, the 3rd pile 23 and the 4th pile 24 are driven underground is made as identical, and the degree of depth is less than 1/20 of the distance between the first pile 21 and the second pile 22; To differ with power frequency that the power supply 4 of setpoint frequency is anodal to be connected the first pile 21, negative pole connects the 4th pile 24.

By parameter obtaining device, can also record the resistance value between the 3rd pile 23 and the 4th pile 24; Then, by arithmetic unit, according to the formula meter of setting, take the distance between the distance between the first pile 21 and the second pile 22, described the second pile 22 and the 3rd pile 23 and resistance value as parameter, calculate soil resistivity.

Concrete, the default formula that is used for the calculating soil resistivity can be ρ=2 π aR(a+b)/b; Wherein, ρ is resistivity; A is the distance between described the first pile and the second pile; B is the distance between described the 3rd pile and the 4th pile; R is the resistance value of electric resistance of soil between described the 3rd pile and the 4th pile.

Preferably, in embodiments of the present invention, the distance between the first pile and the second pile can also be made as with the second pile and the 3rd pile between distance equate i.e. a=b; At this moment, concrete default formula can be ρ=2 π aR; Wherein, ρ is resistivity; A is the distance between described the first pile and the second pile; R is the resistance value of electric resistance of soil between described the 3rd pile and the 4th pile.

As shown in Figure 3, when grounded screen is carried out the test of step voltage and touch voltage, at first, at earthing device 3 be located at the power supply 4 that predeterminated position electric current stake 32 accesses and power frequency differ setpoint frequency; In embodiments of the present invention, adopt the power supply 4 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 3 and the electric current stake 32, thereby avoided the power frequency interference.

In addition, also need the two ends of the first n-body simulation n resistance 34 to be 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 34, with the actual range near human body of trying one's best, concrete predeterminable range can be 1 meter.

Between earthing device 3 and electric current stake 32 with the two-terminal-grounding of the first n-body simulation n resistance 34; The two ends of earthing device 3, electric current stake 32 and the first n-body simulation n resistance 34 linearly distribute;

For the two ends distance that makes human body simulation resistance 34 can be in the Potential distribution district of ground current acquisition maximum stride voltage, the two ends of earthing device 3, electric current stake 32 and the first n-body simulation n resistance 34 linearly need to be distributed.

Parameter obtaining device, concrete can be frequency selective voltmeter, by the magnitude of voltage at the first n-body simulation n resistance of frequency selective voltmeter 5 measurements 34 two ends, this magnitude of voltage is step voltage.

Because in embodiments of the present invention, adopted the power supply 4 of non-power frequency, so when measuring the step voltage that human body simulation resistance 34 produces, need to measure the electric current that the power supply 4 of non-power frequency produces by frequency selective voltmeter 5.Its frequency can dispose accordingly according to the frequency of the power supply 4 of non-power frequency.

Carrying out touch voltage when test, an end of the second human body simulation resistance 6 need to be connected the other end and apart from the ground grounding connection of earthing device setpoint distance with earthing device 3; The earth terminal of earthing device 3, electric current stake 32 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 3.

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 3 with the simulation personnel in the position of 3 one steplengths of distance earthing device.Concrete, the position that is connected with earthing device 3 can be the height of simulating human body, such as can being 1.8 meters.

Parameter obtaining device, concrete can be frequency selective voltmeter, by the voltage at described the second human body simulation resistance of frequency selective voltmeter 7 measurements 6 two ends, this voltage is touch voltage.

Step voltage is similar with measuring, and when measuring touch voltage, need to measure the electric current that the power supply 4 of non-power frequency produces by frequency selective voltmeter 7.Its frequency can dispose accordingly according to the frequency of the power supply 4 of non-power frequency.

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 test findings by less measurement electric current.In the practical application, before every test of the grounded screen in implementing the embodiment of the invention, 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 test current frequency and power current frequency phase-difference in the embodiment of the invention are little, so the error of test findings and actual result is very little, thereby so that net result is comparatively accurate.

Need larger current value different from test current in the prior art with adopting power current, in embodiments of the present invention, what test current can be arranged is much smaller, concrete, 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 test findings more accurate, that need to avoid that the resistance of electric current stake arranges is excessive, and in embodiments of the present invention, for warranty test result's accuracy, resistance value that need to the electric current stake is set to less than 80 ohm.

Similar with arranging of electric current stake, further, in embodiments of the present invention, also need the resistance value of voltage stake to be set to less than 200 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.

Similar with the embedded mode principle of electric current stake, further, in embodiments of the present invention, fully contact the minimizing voltage stake of trying one's best and the contact resistance of the earth for what guarantee voltage stake and the earth, length of embedment that can the voltage 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 test findings, 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 voltage stake, electric current stake and earthing device are linearly arranged, and adopt the electric current of non-power frequency to measure the resistance of earthing device.Because adopting the electric current of non-power frequency tests, so avoided power frequency to measuring the interference of electric current, so also just needn't adopt testing 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 in the situation that does not break away from the spirit or scope of the present invention, realize in other embodiments.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 (9)

1. a grounded screen pilot system is characterized in that, comprising: pile, differ power supply, human body simulation resistance, parameter obtaining device and the arithmetic unit of setpoint frequency with power frequency;
Described pile comprises electric current stake and voltage stake;
Parameter obtaining device is used for obtaining the current value of the described electric current stake that records according to straight-line method and the magnitude of voltage of described voltage stake, and, be used for obtaining the first pile of recording according to four utmost point method of equal intervals and distance and the resistance value between the distance between the second pile, described the second pile and the 3rd pile, and, for the magnitude of voltage that obtains respectively the first n-body simulation n resistance and the second human body simulation resistance two ends;
Described arithmetic unit is used for calculating stake resistance, soil resistivity, contact resistance and the resistance that strides according to described current value, magnitude of voltage, distance and resistance value that the formula of setting calculates and obtains.
2. described grounded screen pilot system according to claim 1 is characterized in that described setpoint frequency is 5 hertz.
3. described grounded screen pilot system according to claim 2 is characterized in that the resistance value of described electric current stake is less than 80 ohm.
4. described grounded screen pilot system according to claim 3 is characterized in that the resistance value of described voltage stake is less than 200 ohm.
5. described grounded screen pilot system according to claim 4 is characterized in that the supply current of described power supply is 1 to 5 ampere.
6. described grounded screen pilot system according to claim 5 is characterized in that, is sinusoidal wave with the electric current of described power supply.
7. described grounded screen pilot system 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 grounded screen pilot system according to claim 7 is characterized in that the length of embedment of described voltage stake is greater than 0.5 meter.
9. described grounded screen pilot system according to claim 8 is characterized in that the distance between described the first pile and the second pile is 5m, 10m, 20m, 30m or 40m.
CN2012103866914A 2012-10-12 2012-10-12 Test system for grounding grid CN102879688A (en)

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Publication number Priority date Publication date Assignee Title
CN103954842A (en) * 2014-04-03 2014-07-30 贵州电力试验研究院 Method for determining grounding resistance value of large-scale grounding system
CN104375007A (en) * 2014-11-21 2015-02-25 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 Soil resistivity measurement method and device based on phase identification
CN107037256A (en) * 2017-03-31 2017-08-11 中广核核电运营有限公司 Ground detection device
CN107329015A (en) * 2017-07-04 2017-11-07 李景禄 A kind of personal safety simulation test method and its device
CN108051647A (en) * 2017-12-01 2018-05-18 湖北省电力勘测设计院有限公司 A kind of method of wind power plant soil resistivity correction measurement

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103954842A (en) * 2014-04-03 2014-07-30 贵州电力试验研究院 Method for determining grounding resistance value of large-scale grounding system
CN103954842B (en) * 2014-04-03 2017-01-18 贵州电力试验研究院 Method for determining grounding resistance value of large-scale grounding system
CN104375007A (en) * 2014-11-21 2015-02-25 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 Soil resistivity measurement method and device based on phase identification
CN104375007B (en) * 2014-11-21 2017-05-31 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 soil resistivity measuring method and device based on phase identification
CN107037256A (en) * 2017-03-31 2017-08-11 中广核核电运营有限公司 Ground detection device
CN107037256B (en) * 2017-03-31 2020-02-11 中广核核电运营有限公司 Grounding detection device
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
CN108051647A (en) * 2017-12-01 2018-05-18 湖北省电力勘测设计院有限公司 A kind of method of wind power plant soil resistivity correction measurement
CN108051647B (en) * 2017-12-01 2020-05-01 湖北省电力勘测设计院有限公司 Method for correcting and measuring soil resistivity of wind power plant

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