CN1584610A - Grounded resistance measuring apparatus - Google Patents
Grounded resistance measuring apparatus Download PDFInfo
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- CN1584610A CN1584610A CN 03152814 CN03152814A CN1584610A CN 1584610 A CN1584610 A CN 1584610A CN 03152814 CN03152814 CN 03152814 CN 03152814 A CN03152814 A CN 03152814A CN 1584610 A CN1584610 A CN 1584610A
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- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 7
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Abstract
A measuring device which uses two linked switches to carry out detection for measuring device is featured as carrying out stray current and stray voltage measurement of the earth to have accurate measuring result for earthing resistance, carrying out detection for connection state of resistance measuring device to earthing electrode to avoid measurement error caused by break point in connection.
Description
Technical field
The present invention relates to a kind of resistance to earth measurement mechanism, particularly a kind of earth resistance metering device.
Background technology
As shown in Figure 1, earth resistance metering device of the prior art includes current measurement circuit and voltage measurement circuit, current measurement circuit comprises power supply V1, K switch 1, reometer A, electric current earth terminal C1 and C2, from power supply V1, through K switch 1, reometer A, electric current earth terminal C1, the earth F, electric current earth terminal C2, get back to power supply V1 at last and form current return; Voltage measurement circuit includes power supply V2, double-throw is cut and closed K2, K3, variable resistor R, voltage table V, voltage earth terminal P1 and P2, and wherein double-throw is cut the stiff end that closes K2, K3 and is 0 end.
When before measuring, preparing, because of the earth self exists stray current, thereby between P1 and P2, form a potential difference (PD), voltage table VV has a reading at this moment, stray voltage value for the earth, at this moment to offset the stray voltage of the earth by power supply V2 and variable resistor R, make the measurement of voltage table V in the measurement subsequently can react the magnitude of voltage of stake resistance under the external power supply effect more truly.Suppose voltage between P1, the P2 and power supply V2 in the same way, then earlier the movable end of K1, K2 is invested 1 end, change the value of resistance R, it is 0 that the voltage that can adjust P1, P2 two ends this moment makes voltage table V reading, has promptly offset the stray voltage of the earth on voltage circuit; Because stray voltage is indefinite direction, if voltage and power supply V2 between P1, the P2 are reverse, then the movable end of K1, K2 is invested 2 ends, can allow voltage between P1, the P2 and power supply V2 in the same way at this moment, adjust voltage table V reading by variable resistor R then.
After adjusting voltage table V, just can begin to carry out the measurement of stake resistance, press K switch 1, this moment, reometer and voltage table V all can produce a reading, utilized calculating formula to calculate stake resistance then.
Weak point in the prior art is: 1, because this current return can't be measured the stray current of the earth, then contain stray current in the current value that when measuring, is read out, but in calculating or do not deduct this stray electrical flow valuve, perhaps can only estimate, bring very big error to result of calculation to stray current; 2, because when carrying out grounding resistance measurement, being connected between ground-electrode and each earth terminal is movable, often disconnect easily in operation, so must detect to this connection, but obviously do not possess this function in the prior art, if the P2 point disconnects, but because the P1 point has a current potential, simultaneously resistance R also will have a current potential with the contact position of voltage table V under the effect of power supply V2, two current potentials may produce potential difference (PD), causing voltage table V that reading is still arranged, can reading at this moment be not the stray voltage value of the earth, so prior art does not have the measuring ability of connection; When 3, before measuring, preparing, to adjust voltage table V, but because the stray voltage of the earth is a non-directional, and aperiodicity, stray voltage and power supply V2 were in the same way when this just may appear at adjustment, and stray voltage is reverse with power supply V2 when measuring, and this has just brought very big error to measurement, and it also is quite loaded down with trivial details operating simultaneously; 4, voltage table V of the prior art and reometer all are to adopt indicator formula instrument, and its reading often difference because of the tester is different, so error calculated is also big.
Summary of the invention
The objective of the invention is to overcome weak point of the prior art and a kind of detection that connects, the while is simple to operate, error is little earth resistance metering device are provided.
The objective of the invention is to realize by following approach:
Earth resistance metering device comprises current measurement circuit and voltage measurement circuit, and its structural feature is,
1.1 current measurement circuit includes power supply U, reometer A, the first switch LA1, second switch LA2, the 3rd switch QK1 and the 4th switch QK2, the first electric current earth terminal C1 and the second electric current earth terminal C2;
1.1.1 the first switch LA1 and the power supply U formation power circuit that is connected in series wherein,
The formation table meter circuit 1.1.2 reometer A and power circuit are connected in series,
1.1.3 the first electric current earth terminal C1, the 3rd switch QK1, table meter circuit, the 4th switch QK2 and the second electric current earth terminal C2 are electrically connected in series in regular turn,
1.1.4 second switch LA2 then is attempted by the two ends of power circuit;
1.2 voltage measurement circuit then includes voltage table V, the 5th switch QK3, the first voltage earth terminal P1 and the second voltage earth terminal P2,
1.2.1 the first voltage earth terminal P1, the 5th switch QK3, voltage table V and the second voltage earth terminal P2 are electrically connected in series in regular turn,
1.3 the 3rd switch QK1 and the 4th switch QK2 are double-throw and cut the pass, and
1.3.1 activity 1 end of the 3rd switch QK1 is electrically connected with the first electric current earth terminal C1, and fix 0 end and be electrically connected with table meter circuit,
1.3.2 activity 1 end of the 4th switch QK2 is electrically connected with the second electric current earth terminal C2, and fix 0 end and be electrically connected with table meter circuit,
1.3.3 activity 2 ends of the 3rd switch QK1 are electrically connected with the movable end of the 5th switch QK3, activity 2 ends of the 4th switch QK2 then are electrically connected with the second voltage earth terminal P2.
When preparing before measuring, the first electric current earth terminal C1, the second electric current earth terminal C2 and the first voltage earth terminal P1, the second voltage earth terminal P2 insert in the ground of required measurement by electrode bar for grounding respectively.
The measurement of at first carrying out the earth stray current is connected the detection of situation with the electric current earthing pole: the first switch LA 1 disconnects, second switch LA2 closure, the 3rd switch QK1 and the equal switching of the 4th switch QK2 are at movable 1 end, form a parasitic loop in the current measurement circuit this moment, promptly the first electric current earth terminal C1 passes through reometer in regular turn, second switch LA2, the second electric current earth terminal C2 and the earth and form a loop, if the reometer A of this moment has reading, then flowing through in this loop must be the earth stray current, and the reading of reometer A is the value of stray current, thereby finish the measurement of the earth stray current, make the stake resistance can be more accurate in computation process, and reduced error greatly.If the reometer A non-metering of this moment, can the closed first switch LA1, as reometer A still during non-metering, illustrate that breakpoint appears in two electric current earth terminals and being connected of electrode bar, cause circuit to disconnect, so just can the connection state of circuit be detected, thereby guarantee carrying out smoothly of measurement, and can reduce measuring error.
The measurement of carrying out the earth stray voltage then is connected the detection of situation with the voltage earthing pole: because when measuring stray current, the 5th switch QK3 closure, the voltage table V of this moment is attempted by on the two voltage earth terminals, and the current potential of two ground voltage terminal equates with the current potential of electrode grounding end, so the reading of voltage table V is the earth stray voltage value, thereby records the earth stray voltage value.Then the 5th switch QK3 is disconnected, the 3rd switch QK1 and the 4th switch QK2 difference switching are at movable 2 ends, this moment is the same with the measurement of electric current earth terminal, the first voltage earth terminal is through the 3rd switch QK1, reometer and second switch LA2, the 4th switch QK2 and form a loop, if this moment, reometer had reading, then account for voltage earth terminal connection state is normal, if non-metering, still non-metering closes behind the first switch LA1, then account for voltage earth terminal and ground-electrode be connected with breakpoint, or connection status is undesired.
When carrying out grounding resistance measurement, the 3rd switch QK1 and the 4th switch QK2 distinguish switching at movable 1 end, the first switch LA1 closure, and second switch LA2 disconnects, thereby introduces power supply U, and the 5th switch QK3 closure promptly is in the measurement state this moment.Under power supply U effect, current measurement circuit is introduced an electric current and is flowed into the earth, and this electric current will be superimposed upon on the stray current, and change the magnitude of voltage of stake resistance, thereby can calculate stake resistance:
Wherein: R is a grounding resistance, the voltage readings when U is measurement, the current indication when I is measurement, U
AssortedFor measuring the stray voltage value of gained, I
AssortedFor measuring the stray electrical flow valuve of gained, the two is vector.
Like this, the more original technology of the present invention is compared, both had the connection state that detects between electric current, voltage earth terminal and the ground-electrode, possessed the effect of measuring original the earth stray voltage and stray current again, thereby can reduce measuring error greatly when having guaranteed measurement of Grounding Resistance; When next used this device to measure, measuring method was simple, needn't proofread the direction of stray voltage repeatedly, the non-directional of stray voltage and stray current and sizing is little to measurement result influence.
The present invention can also further be specially:
Reometer A is that a kind of numeral shows reometer.
Voltage table V is that a kind of numeral shows reometer.
The table meter that adopts numeral to show can make reading more accurate, because the reading of pointer table meter always varies with each individual, its reading error is big, and the table meter that numeral shows then can clearly show measured value, thereby further guarantees the degree of accuracy of result of calculation.
Also include a computer processing unit, its sampling input end is electrically connected with reometer and voltage table V respectively.
Computer processing unit includes sampler, arithmetic unit and the data output device that is electrically connected in regular turn.
Stray voltage and the stray electrical flow valuve of the sampler of computer processing unit during with first sampling and measuring, and then magnitude of voltage and current value during sampling and measuring resistance, the arithmetic unit that worked of going forward side by side carries out the computing of stake resistance, at last operation result is sent out by data output device.Because microcomputer has the function of real-time measurement and real-time operation, its fast operation, and more accurate, having avoided the people is the loaded down with trivial details of computing.
Power supply U can also further be specially:
Power supply U can be a kind of ultracapacitor power supply.
Adopt the ultracapacitor power supply to have following advantage: 1, the ultracapacitor power volume is little, is easy to carry; 2, the storable energy height of ultracapacitor power supply can improve electric current and voltage when measuring thus, makes it far above stray current and stray voltage, and the non-directional of stray current and stray voltage the and influence of sizing is just not little like this, even can ignore; 3, the charging of ultracapacitor and discharge condition are not subjected to the restriction of self-energy, even electric weight is still sufficient, still chargeable, and under the state that discharges fully, still this capacitor can be charged to institute's energy requirement, and be easy to use.
Certainly, power supply U can also be a kind of accumulator, or power supply U can be uninterrupted power source, i.e. UPS.
The present invention can also further be specially:
The first switch LA1 and the second switch LA2 linked switch LA that can integrate.This switch can have two states, and promptly action each time will cause being connected on two circuit on this switch, have only one the tunnel to be conducting, and another road is a situation about disconnecting: when the first switch LA1 closure, its corresponding loop conducting, second switch LA2 must disconnect, and then corresponding loop disconnects; Otherwise when first switch LA1 disconnection, second switch LA2 is inevitable closed.The third state can also be arranged, and promptly can also be the situation that two-way is disconnection.
The 5th switch QK3 also is that the pass is cut in a kind of double-throw, itself and the 3rd switch QK1 and the 4th switch QK2 form one or three linked switch K, this moment, 0 end of fixing of the 5th switch QK3 was electrically connected with voltage table V, and movable 1 end is electrically connected with activity 2 ends of the 3rd switch QK1, and activity 2 ends of the 5th switch QK3 are then unsettled.
Further can be specially three linked switches in the same way, i.e. switch motion direction unanimity, or trend of purchasing activity 1 ends all, or trend of purchasing activity 2 ends all.Because the 3rd switch QK1, the 4th switch QK2 and the 5th switch QK3 move simultaneously in operating process, so its movable switching end is linked, promptly when linked switch trend of purchasing activity 1 end, then the 3rd switch QK1, the 4th switch QK2 all are connected to movable 1 end with the 5th switch QK3, and when linked switch trend of purchasing activity 2 ends, then the 3rd switch QK1, the 4th switch QK2 all are connected to movable 2 ends with the 5th switch QK3.Like this, operate just much simple and conveniently, need not each switch is operated, get final product and only need operate to linked switch.
In sum, the invention has the advantages that: 1, can carry out the measurement of the earth stray current and stray voltage, thus the accurate measurement result of stake resistance; 2, can the connection status between earth resistance metering device and the ground-electrode be detected, thereby avoid the measurement mistake that breakpoint brings occurring because of connection; 3, measuring method is simple, needn't proofread the direction of stray voltage repeatedly.
Description of drawings
Figure 1 shows that the circuit diagram of described prior art;
Figure 2 shows that the circuit diagram of earth resistance metering device of the present invention;
Below we further describe the present invention in conjunction with the embodiments.
Specific embodiment
Most preferred embodiment:
Referring to Fig. 2, earth resistance metering device comprises current measurement circuit and voltage measurement circuit, wherein:
1) current measurement circuit includes power supply U, reometer A, the first switch LA1, second switch LA2, the 3rd switch QK1 and the 4th switch QK2, the first electric current earth terminal C1 and the second electric current earth terminal C2;
● reometer A is a kind of digital electronic ammeter;
● power supply U is a kind of ultracapacitor power supply;
● the first switch LA1 and the ultracapacitor power supply U formation power circuit that is connected in series;
● digital current Table A and the power circuit formation table meter circuit that is connected in series;
● the first electric current earth terminal C1, the 3rd switch QK1, table meter circuit, the 4th switch QK2 and the second electric current earth terminal C2 are electrically connected in series in regular turn,
● second switch LA2 then is attempted by the two ends of power circuit;
● the first switch LA1 and second switch LA2L form linked switch LA;
2) voltage measurement circuit then includes voltage table V, the 5th switch QK3, the first voltage earth terminal P1 and the second voltage earth terminal P2,
● voltage table V is a digital voltmeter;
● the first voltage earth terminal P1, the 5th switch QK3, voltage table V and the second voltage earth terminal P2 are electrically connected in series in regular turn;
● the 3rd switch QK1, the 4th switch QK2 and the 5th switch QK3 are double-throw and cut close, and three switches are three linked switch K in the same way, i.e. switch motion direction unanimity, or trend of purchasing activity 1 ends all, or trend of purchasing activity 2 ends all;
● activity 1 end of the 3rd switch QK1 is electrically connected with the first electric current earth terminal C1, fix 0 end and be electrically connected with table meter circuit, and movable 2 ends is electrically connected with activity 1 end of the 5th switch QK3;
● activity 1 end of the 4th switch QK2 is electrically connected with the second electric current earth terminal C2, fix 0 end and be electrically connected with table meter circuit, and movable 2 ends is electrically connected with voltage table V;
● 0 end of fixing of the 5th switch QK3 is electrically connected with voltage table V, and movable 2 ends are unsettled.
When preparing before measuring, the first electric current earth terminal C1, the second electric current earth terminal C2 and the first voltage earth terminal P1, the second voltage earth terminal P2 insert in the earth of required measurement by electrode bar for grounding respectively.
The measurement of at first carrying out the earth stray current is connected the detection of situation with the electric current earthing pole: linked switch LA action, the first switch LA1 disconnects, second switch LA2 closure, linked switch K action, the 3rd switch QK1 and the equal switching of the 4th switch QK2 are at movable 1 end, form a parasitic loop in the current measurement circuit this moment, promptly the first electric current earth terminal is in regular turn by reometer A, second switch LA2, the second electric current earth terminal C2 and the earth and form a loop, if the reometer A of this moment has reading, then flowing through in this loop must be the earth stray current, and the reading of reometer is the value of stray current, thereby finish the measurement of the earth stray current, make the stake resistance can be more accurate in computation process, and reduced error greatly.If the reometer non-metering of this moment, but operations linkage switch LA makes the first switch LA1 closure, if reading is arranged, the stray current that be described this moment is 0, if reometer still during non-metering, illustrate two electric current earth terminals and being connected of electrode bar breakpoint to occur, or breakpoint appears in the circuit of measurement mechanism self, cause circuit to disconnect, so just can the connection state of circuit be detected, thereby guarantee carrying out smoothly of measurement, and can reduce measuring error.
The measurement of carrying out the earth stray voltage then is connected the detection of situation with the voltage earthing pole: because when measuring stray current, the 5th switch QK3 closure, the voltage table V of this moment is attempted by on the two voltage earth terminals, and the current potential of two ground voltage terminal equates with the current potential of electrode grounding end, so the reading of voltage table V is the earth stray voltage value, thereby records the earth stray voltage value.Linked switch K action then, the 5th switch QK3, the 3rd switch QK1 and the 4th switch QK2 difference switching are at movable 2 ends, this moment is the same with the measurement of electric current earth terminal, the first voltage earth terminal is through the 3rd switch QK1, reometer A and second switch LA2, the 4th switch QK2 and form a loop, if this moment, reometer had reading, then account for voltage earth terminal connection state is normal, if non-metering, and non-metering still behind the first switch LA1 that closes, then account for voltage earth terminal and ground-electrode be connected with breakpoint, or connection status is undesired.If the connection status of this moment is undesired, then the stray voltage value of being surveyed before also must be wrong, need remeasure.
At last, after all detect normally, just can carry out grounding resistance measurement, linked switch K moves once more, and the 3rd switch QK1, the 4th switch QK2 and the 5th switch QK3 switching respectively promptly are in the measurement state this moment at movable 1 end.Under the effect of ultracapacitor power supply, current measurement circuit is introduced an electric current and is flowed into the earth, and this electric current will be superimposed upon on the stray current, and change the magnitude of voltage of stake resistance, thereby can calculate stake resistance:
Wherein: R is a grounding resistance, the voltage readings when U is measurement, the current indication when I is measurement, U
AssortedFor measuring the stray voltage value of gained, I
AssortedFor measuring the stray electrical flow valuve of gained, the two is vector.
It is same as the prior art that the present invention does not state part.
Claims (10)
1, earth resistance metering device comprises current measurement circuit and voltage measurement circuit, it is characterized in that,
1) current measurement circuit includes power supply U, reometer A, the first switch LA1, second switch LA2, the 3rd switch QK1 and the 4th switch QK2, the first electric current earth terminal C1 and the second electric current earth terminal C2;
1. the first switch LA1 and the power supply U formation power circuit that is connected in series wherein,
2. reometer A and the power circuit formation table meter circuit that is connected in series,
3. the first electric current earth terminal C1, the 3rd switch QK1, table meter circuit, the 4th switch QK2 and the second electric current earth terminal C2 are electrically connected in series in regular turn,
4. second switch LA2 then is attempted by the two ends of power circuit;
2) voltage measurement circuit then includes voltage table V, the 5th switch QK3, the first voltage earth terminal P1 and the second voltage earth terminal P2,
1. the first voltage earth terminal P1, the 5th switch QK3, voltage table V and the second voltage earth terminal P2 are electrically connected in series in regular turn,
3) the 3rd switch QK1 and the 4th switch QK2 are double-throw and cut the pass, and
1. activity 1 end of the 3rd switch QK1 is electrically connected with the first electric current earth terminal C1, and fix 0 end and be electrically connected with table meter circuit,
2. activity 1 end of the 4th switch QK2 is electrically connected with the second electric current earth terminal C2, and fix 0 end and be electrically connected with table meter circuit,
3. activity 2 ends of the 3rd switch QK1 are electrically connected with the movable end of the 5th switch QK3, and activity 2 ends of the 4th switch QK2 then are electrically connected with the second voltage earth terminal.
2, earth resistance metering device according to claim 1 is characterized in that, reometer A is that a kind of numeral shows reometer.
3, earth resistance metering device according to claim 1 is characterized in that, voltage table V is that a kind of numeral shows reometer.
4, earth resistance metering device according to claim 1 is characterized in that, also includes a computer processing unit, and its sampling input end is electrically connected with reometer A and voltage table V respectively.
5, earth resistance metering device according to claim 4 is characterized in that, computer processing unit includes sampler, arithmetic unit and the data output device that is electrically connected in regular turn.
6, earth resistance metering device according to claim 1 is characterized in that, power supply U can be a kind of ultracapacitor power supply.
7, earth resistance metering device according to claim 1 is characterized in that, the first switch LA1 and the second switch LA2 linked switch LA that can integrate.
8, earth resistance metering device according to claim 1, it is characterized in that, the 5th switch QK3 also is that the pass is cut in a kind of double-throw, itself and the 3rd switch QK1 and the 4th switch QK2 form one or three linked switch K, this moment, 0 end of fixing of the 5th switch QK3 was electrically connected with voltage table V, and movable 1 end is electrically connected with activity 2 ends of the 3rd switch QK1.
9, earth resistance metering device according to claim 8 is characterized in that, three linked switch K are a kind of three linked switches in the same way.
10, earth resistance metering device according to claim 8 is characterized in that, activity 2 ends of the 5th switch QK3 are unsettled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031528147A CN100420951C (en) | 2003-08-19 | 2003-08-19 | Grounded resistance measuring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031528147A CN100420951C (en) | 2003-08-19 | 2003-08-19 | Grounded resistance measuring apparatus |
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| CN1584610A true CN1584610A (en) | 2005-02-23 |
| CN100420951C CN100420951C (en) | 2008-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB031528147A Expired - Fee Related CN100420951C (en) | 2003-08-19 | 2003-08-19 | Grounded resistance measuring apparatus |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102508040A (en) * | 2011-11-21 | 2012-06-20 | 湖北省防雷中心 | Special grounded resistor detector |
| TWI404944B (en) * | 2010-12-27 | 2013-08-11 | Automotive Res & Testing Ct | Insulation resistance measuring device for electric vehicles |
| CN103941098A (en) * | 2014-05-06 | 2014-07-23 | 国家电网公司 | Ground resistance measuring equipment and measuring method for large transformer substation |
| CN105785134A (en) * | 2016-03-17 | 2016-07-20 | 中国地质科学院地球物理地球化学勘查研究所 | Non-polarized electrode grounding resistance measurement method |
| CN106443196A (en) * | 2016-08-25 | 2017-02-22 | 中国科学院地质与地球物理研究所 | Electrode grounding resistance measuring system and electrode grounding resistance measuring method |
| CN109149563A (en) * | 2018-08-28 | 2019-01-04 | 深圳供电局有限公司 | A kind of method of Stray current values in determining AC network |
| CN111796217A (en) * | 2020-07-28 | 2020-10-20 | 宁夏中科天际防雷股份有限公司 | Intelligent detection device, system and method for disconnection card |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60200178A (en) * | 1984-03-23 | 1985-10-09 | Yonshin Denki Kk | Earth resistance meter |
| JPH0644024B2 (en) * | 1987-09-03 | 1994-06-08 | カヤ商事株式会社 | Ground resistance measuring device |
| CN1133878C (en) * | 1999-08-16 | 2004-01-07 | 国家电力公司武汉高压研究所 | Isofrequency measuring method for earth resistance and apparatus thereof |
| CN2658754Y (en) * | 2003-08-19 | 2004-11-24 | 福建省电力勘测设计院 | Earth resistance measuring device |
-
2003
- 2003-08-19 CN CNB031528147A patent/CN100420951C/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI404944B (en) * | 2010-12-27 | 2013-08-11 | Automotive Res & Testing Ct | Insulation resistance measuring device for electric vehicles |
| CN102508040A (en) * | 2011-11-21 | 2012-06-20 | 湖北省防雷中心 | Special grounded resistor detector |
| CN102508040B (en) * | 2011-11-21 | 2014-05-14 | 湖北省防雷中心 | Special grounded resistor detector |
| CN103941098A (en) * | 2014-05-06 | 2014-07-23 | 国家电网公司 | Ground resistance measuring equipment and measuring method for large transformer substation |
| CN105785134A (en) * | 2016-03-17 | 2016-07-20 | 中国地质科学院地球物理地球化学勘查研究所 | Non-polarized electrode grounding resistance measurement method |
| CN105785134B (en) * | 2016-03-17 | 2018-05-29 | 中国地质科学院地球物理地球化学勘查研究所 | Unpolarizable electrode ground resistance measurement method |
| CN106443196A (en) * | 2016-08-25 | 2017-02-22 | 中国科学院地质与地球物理研究所 | Electrode grounding resistance measuring system and electrode grounding resistance measuring method |
| CN106443196B (en) * | 2016-08-25 | 2017-12-19 | 中国科学院地质与地球物理研究所 | A kind of measuring system and method for electrode grounding resistance |
| CN109149563A (en) * | 2018-08-28 | 2019-01-04 | 深圳供电局有限公司 | A kind of method of Stray current values in determining AC network |
| CN109149563B (en) * | 2018-08-28 | 2021-07-30 | 深圳供电局有限公司 | Method for determining stray current value in alternating current power grid |
| CN111796217A (en) * | 2020-07-28 | 2020-10-20 | 宁夏中科天际防雷股份有限公司 | Intelligent detection device, system and method for disconnection card |
| CN111796217B (en) * | 2020-07-28 | 2023-05-16 | 中科天际科技股份有限公司 | Intelligent detection device, system and method for broken connector |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100420951C (en) | 2008-09-24 |
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