CN109828156A - Method of Testing Earth-Contact Resistance - Google Patents
Method of Testing Earth-Contact Resistance Download PDFInfo
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- CN109828156A CN109828156A CN201910181586.9A CN201910181586A CN109828156A CN 109828156 A CN109828156 A CN 109828156A CN 201910181586 A CN201910181586 A CN 201910181586A CN 109828156 A CN109828156 A CN 109828156A
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Abstract
The invention discloses method of Testing Earth-Contact Resistance, include the following steps: S1: carrying out the preparation of earth resistance tester first, S2: the ground resistance resistance value of earth resistance tester measurement lightning arrester is utilized, S3: after the wiring for having carried out step S2, check whether galvanometric pointer is directed toward center line, S4: ground resistance resistance value information is converted to analog signal by D/A converter by resistance meter after measurement finishes, S5: it repeats the above steps repeatedly, ground resistance is taken multiple measurements, S6: the data in step S5 are finally weighted and averaged calculating, the method of Testing Earth-Contact Resistance step is clear, implement operating process simplicity, measurement result accuracy wherein can greatly be improved for the accurate use of ground resistance instrument, secondly the resistance value obtained using weighted mean method It is extremely reliable effective.
Description
Technical field
The present invention relates to ground resistance technical field more particularly to method of Testing Earth-Contact Resistance.
Background technique
Ground resistance is exactly for measuring the whether good important parameter of ground state, is electric current by earthing or grounding means stream
Enter the earth greatly to be flowed to another grounding body again or distally spread encountered resistance, it includes ground line and grounding body itself
Resistance, the resistance of the earth or grounding body arrive between contact resistance and two grounding bodies between grounding body and the resistance of the earth
The ground resistance of unlimited distance.Ground resistance size directly represents the good degree that electric device is contacted with " ground ", also reflects
The scale of grounded screen.In power industry, the test of ground resistance is very important, traditional earth resistance side
Method step is too simple, and the complex that really operates, and just results in the inaccuracy of measurement result in this way.
Summary of the invention
The invention proposes method of Testing Earth-Contact Resistance, to solve the problems mentioned in the above background technology.
The invention proposes method of Testing Earth-Contact Resistance, include the following steps:
S1: the preparation of earth resistance tester is carried out first, preparation includes poring over the use of earth resistance tester
Specification, fully understands the structural behaviour and application method of instrument, while getting all the tool necessary to measurement and whole ready
Instrument attachment, and by instrument and grounded probe wiped clean, it is in addition that the tie point or ground connection that are grounded main line and grounding body is dry
The tie point of all ground connection branch lines disconnects on line, so that grounding body is detached from any connection relationship and becomes separate component；
S2: using earth resistance tester measurement lightning arrester ground resistance resistance value, wherein the specific steps are first into
Grounding body is connected by row wiring with shortest special wire with the terminals E1 or C2 of earthometer, with it is longest specially
It will be connected apart from the measurement probe of grounding body 40m with the terminal knob C1 of measuring instrument with conducting wire, with placed in the middle special of remaining length
It will be connected apart from the measurement probe of 20~25m of grounding body with the terminals P1 of measuring instrument with conducting wire；
S3: it after the wiring for having carried out step S2, checks whether galvanometric pointer is directed toward center line, otherwise adjusts zero-bit
Adjuster makes measuring instrument pointer be directed toward center line, and multiplying power scale is then placed in maximum multiple, and is slowly rotated with generator and turns
Handle, while turn measurement dial makes galvanometer pointer be directed toward center line, when galvanometric pointer shakes close to quickening when balancing
Turn handle makes its revolving speed reach 120~300r/min, while adjusting measurement dial, so that pointer is directed toward center line, finally calculates
Measurement result, i.e. R it is equal to multiplying power scale reading multiplied by measurement dial reading；
S4: ground resistance resistance value information is converted to simulation letter by D/A converter by resistance meter after measurement finishes
Number, simultaneously because the resistance meter used has wireless communication function, it is converted into utilizing radio communication mold after analog signal
Analog signal is sent to extraneous receiving instrument by block, and receiving instrument is converted after receiving analog signal using A/D converter,
It is converted into performing corresponding processing again after digital signal；
S5: repeating the above steps repeatedly, take multiple measurements to ground resistance, and measurement carries out the note of data after finishing
At this moment recording curve and record form are drawn in record；
S6: being finally weighted and averaged calculating for the data in step S5, and the weighted average finally used is survey
Measure resistance value.
Preferred: the use condition of the earth resistance tester in step S1 is environment temperature in 0~45 DEG C, relative humidity
Less than or equal to 85%RH, wherein the resistance test range of earth resistance tester is 20~200 Ω, test voltage is 0~
20V。
It is preferred: if the reading for measuring dial in step s3 is too small so that when being not easy to read accurate, to illustrate multiplying power
Scale multiple is excessive, and multiplying power scale should be placed in lesser multiple at this time, and readjusting measurement dial makes pointer be directed toward center
On line and read accurate reading.
It is preferred: before the measurement for carrying out ground resistance, it is to be ensured that cannot nearby there be stray electrical current and in tested earth polar
Polarized soil, while after raining and when soil absorption moisture is too many and when the change dramaticallies such as weather, temperature, pressure
It is not capable of measuring.
It is preferred: to be needed in the specific measurement process of step S2 using detection needle, wherein detection needle should be far from underground water
The larger metallic object such as pipe, cable, railway, wherein electric current pole should be far from 10m or more, and voltage pole should be far from 50m or more, such as above-mentioned gold
When category body is not connect with grounded screen, it can shorten apart from half to one third.
Method of Testing Earth-Contact Resistance proposed by the present invention, beneficial effect are: the method for Testing Earth-Contact Resistance step is clear,
Operating process simplicity is implemented, wherein it is accurate to improve measurement result for the accurate use of ground resistance instrument
Secondly degree is also extremely reliable effective using the resistance value that weighted mean method obtains.
Specific embodiment
It is next combined with specific embodiments below that the present invention will be further described.
Embodiment 1
The invention proposes method of Testing Earth-Contact Resistance, include the following steps:
S1: the preparation of earth resistance tester is carried out first, preparation includes poring over the use of earth resistance tester
Specification, fully understands the structural behaviour and application method of instrument, while getting all the tool necessary to measurement and whole ready
Instrument attachment, and by instrument and grounded probe wiped clean, it is in addition that the tie point or ground connection that are grounded main line and grounding body is dry
The tie point of all ground connection branch lines disconnects on line, so that grounding body is detached from any connection relationship and becomes separate component；
S2: using earth resistance tester measurement lightning arrester ground resistance resistance value, wherein the specific steps are first into
Grounding body is connected by row wiring with shortest special wire with the terminals E1 or C2 of earthometer, with it is longest specially
It will be connected apart from the measurement probe of grounding body 40m with the terminal knob C1 of measuring instrument with conducting wire, with placed in the middle special of remaining length
It will be connected apart from the measurement probe of grounding body 20m with the terminals P1 of measuring instrument with conducting wire；
S3: it after the wiring for having carried out step S2, checks whether galvanometric pointer is directed toward center line, otherwise adjusts zero-bit
Adjuster makes measuring instrument pointer be directed toward center line, and multiplying power scale is then placed in maximum multiple, and is slowly rotated with generator and turns
Handle, while turn measurement dial makes galvanometer pointer be directed toward center line, when galvanometric pointer shakes close to quickening when balancing
Turn handle makes its revolving speed reach 120r/min, while adjusting measurement dial, and pointer is made to be directed toward center line, finally calculates measurement
As a result, i.e. R be equal to multiplying power scale reading multiplied by measurement dial reading；
S4: ground resistance resistance value information is converted to simulation letter by D/A converter by resistance meter after measurement finishes
Number, simultaneously because the resistance meter used has wireless communication function, it is converted into utilizing radio communication mold after analog signal
Analog signal is sent to extraneous receiving instrument by block, and receiving instrument is converted after receiving analog signal using A/D converter,
It is converted into performing corresponding processing again after digital signal；
S5: repeating the above steps repeatedly, take multiple measurements to ground resistance, and measurement carries out the note of data after finishing
At this moment recording curve and record form are drawn in record；
S6: being finally weighted and averaged calculating for the data in step S5, and the weighted average finally used is survey
Measure resistance value.
The use condition of earth resistance tester in step S1 is that environment temperature is less than or waits in 0 DEG C, relative humidity
In 85%RH, wherein the resistance test range of earth resistance tester is 20~200 Ω, and test voltage is 0~20V.
If the reading for measuring dial in step s3 is too small so that when being not easy to read accurate, illustrate multiplying power scale multiple
It is excessive, multiplying power scale should be placed in lesser multiple at this time, readjusting measurement dial is directed toward pointer on center line and reads
Accurate reading out.
Before the measurement for carrying out ground resistance, it is to be ensured that cannot nearby there be stray electrical current and polarized soil in tested earth polar
Earth, while after raining and when soil absorption moisture is too many and not being capable of measuring when the change dramaticallies such as weather, temperature, pressure.
Needed in the specific measurement process of step S2 using detection needle, wherein detection needle should far from foggara, cable,
The larger metallic object such as railway, wherein electric current pole should far from 10m or more, voltage pole should far from 50m or more, such as above-mentioned metallic object with connect
When earth mat does not connect, it can shorten apart from half to one third.
Embodiment 2
The invention proposes method of Testing Earth-Contact Resistance, include the following steps:
S1: the preparation of earth resistance tester is carried out first, preparation includes poring over the use of earth resistance tester
Specification, fully understands the structural behaviour and application method of instrument, while getting all the tool necessary to measurement and whole ready
Instrument attachment, and by instrument and grounded probe wiped clean, it is in addition that the tie point or ground connection that are grounded main line and grounding body is dry
The tie point of all ground connection branch lines disconnects on line, so that grounding body is detached from any connection relationship and becomes separate component；
S2: using earth resistance tester measurement lightning arrester ground resistance resistance value, wherein the specific steps are first into
Grounding body is connected by row wiring with shortest special wire with the terminals E1 or C2 of earthometer, with it is longest specially
It will be connected apart from the measurement probe of grounding body 40m with the terminal knob C1 of measuring instrument with conducting wire, with placed in the middle special of remaining length
It will be connected apart from the measurement probe of grounding body 25m with the terminals P1 of measuring instrument with conducting wire；
S3: it after the wiring for having carried out step S2, checks whether galvanometric pointer is directed toward center line, otherwise adjusts zero-bit
Adjuster makes measuring instrument pointer be directed toward center line, and multiplying power scale is then placed in maximum multiple, and is slowly rotated with generator and turns
Handle, while turn measurement dial makes galvanometer pointer be directed toward center line, when galvanometric pointer shakes close to quickening when balancing
Turn handle makes its revolving speed reach 300r/min, while adjusting measurement dial, and pointer is made to be directed toward center line, finally calculates measurement
As a result, i.e. R be equal to multiplying power scale reading multiplied by measurement dial reading；
S4: ground resistance resistance value information is converted to simulation letter by D/A converter by resistance meter after measurement finishes
Number, simultaneously because the resistance meter used has wireless communication function, it is converted into utilizing radio communication mold after analog signal
Analog signal is sent to extraneous receiving instrument by block, and receiving instrument is converted after receiving analog signal using A/D converter,
It is converted into performing corresponding processing again after digital signal；
S5: repeating the above steps repeatedly, take multiple measurements to ground resistance, and measurement carries out the note of data after finishing
At this moment recording curve and record form are drawn in record；
S6: being finally weighted and averaged calculating for the data in step S5, and the weighted average finally used is survey
Measure resistance value.
The use condition of earth resistance tester in step S1 is that environment temperature is less than or waits in 45 DEG C, relative humidity
In 85%RH, wherein the resistance test range of earth resistance tester is 20~200 Ω, and test voltage is 0~20V.
If the reading for measuring dial in step s3 is too small so that when being not easy to read accurate, illustrate multiplying power scale multiple
It is excessive, multiplying power scale should be placed in lesser multiple at this time, readjusting measurement dial is directed toward pointer on center line and reads
Accurate reading out.
Before the measurement for carrying out ground resistance, it is to be ensured that cannot nearby there be stray electrical current and polarized soil in tested earth polar
Earth, while after raining and when soil absorption moisture is too many and not being capable of measuring when the change dramaticallies such as weather, temperature, pressure.
Needed in the specific measurement process of step S2 using detection needle, wherein detection needle should far from foggara, cable,
The larger metallic object such as railway, wherein electric current pole should far from 10m or more, voltage pole should far from 50m or more, such as above-mentioned metallic object with connect
When earth mat does not connect, it can shorten apart from half to one third.
Embodiment 3
The invention proposes method of Testing Earth-Contact Resistance, include the following steps:
S1: the preparation of earth resistance tester is carried out first, preparation includes poring over the use of earth resistance tester
Specification, fully understands the structural behaviour and application method of instrument, while getting all the tool necessary to measurement and whole ready
Instrument attachment, and by instrument and grounded probe wiped clean, it is in addition that the tie point or ground connection that are grounded main line and grounding body is dry
The tie point of all ground connection branch lines disconnects on line, so that grounding body is detached from any connection relationship and becomes separate component；
S2: using earth resistance tester measurement lightning arrester ground resistance resistance value, wherein the specific steps are first into
Grounding body is connected by row wiring with shortest special wire with the terminals E1 or C2 of earthometer, with it is longest specially
It will be connected apart from the measurement probe of grounding body 40m with the terminal knob C1 of measuring instrument with conducting wire, with placed in the middle special of remaining length
It will be connected apart from the measurement probe of grounding body 23m with the terminals P1 of measuring instrument with conducting wire；
S3: it after the wiring for having carried out step S2, checks whether galvanometric pointer is directed toward center line, otherwise adjusts zero-bit
Adjuster makes measuring instrument pointer be directed toward center line, and multiplying power scale is then placed in maximum multiple, and is slowly rotated with generator and turns
Handle, while turn measurement dial makes galvanometer pointer be directed toward center line, when galvanometric pointer shakes close to quickening when balancing
Turn handle makes its revolving speed reach 150r/min, while adjusting measurement dial, and pointer is made to be directed toward center line, finally calculates measurement
As a result, i.e. R be equal to multiplying power scale reading multiplied by measurement dial reading；
S4: ground resistance resistance value information is converted to simulation letter by D/A converter by resistance meter after measurement finishes
Number, simultaneously because the resistance meter used has wireless communication function, it is converted into utilizing radio communication mold after analog signal
Analog signal is sent to extraneous receiving instrument by block, and receiving instrument is converted after receiving analog signal using A/D converter,
It is converted into performing corresponding processing again after digital signal；
S5: repeating the above steps repeatedly, take multiple measurements to ground resistance, and measurement carries out the note of data after finishing
At this moment recording curve and record form are drawn in record；
S6: being finally weighted and averaged calculating for the data in step S5, and the weighted average finally used is survey
Measure resistance value.
The use condition of earth resistance tester in step S1 is that environment temperature is less than or waits in 40 DEG C, relative humidity
In 85%RH, wherein the resistance test range of earth resistance tester is 20~200 Ω, and test voltage is 0~20V.
If the reading for measuring dial in step s3 is too small so that when being not easy to read accurate, illustrate multiplying power scale multiple
It is excessive, multiplying power scale should be placed in lesser multiple at this time, readjusting measurement dial is directed toward pointer on center line and reads
Accurate reading out.
Before the measurement for carrying out ground resistance, it is to be ensured that cannot nearby there be stray electrical current and polarized soil in tested earth polar
Earth, while after raining and when soil absorption moisture is too many and not being capable of measuring when the change dramaticallies such as weather, temperature, pressure.
Needed in the specific measurement process of step S2 using detection needle, wherein detection needle should far from foggara, cable,
The larger metallic object such as railway, wherein electric current pole should far from 10m or more, voltage pole should far from 50m or more, such as above-mentioned metallic object with connect
When earth mat does not connect, it can shorten apart from half to one third.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (5)
1. method of Testing Earth-Contact Resistance, which comprises the following steps:
S1: the preparation of earth resistance tester is carried out first, preparation includes poring over the operation instruction of earth resistance tester
Book, fully understands the structural behaviour and application method of instrument, while getting all the tool necessary to measurement and whole instruments ready
Attachment, and by instrument and grounded probe wiped clean, in addition it will be grounded on the tie point or ground connection main line of main line and grounding body
The tie point of all ground connection branch lines disconnects, so that grounding body is detached from any connection relationship and becomes separate component；
S2: using the ground resistance resistance value of earth resistance tester measurement lightning arrester, wherein the specific steps are connect first
Grounding body is connected by line with shortest special wire with the terminals E1 or C2 of earthometer, dedicated is led with longest
Line will be connected apart from the measurement probe of grounding body 40m with the terminal knob C1 of measuring instrument, be led with placed in the middle dedicated of remaining length
Line will be connected apart from the measurement probe of 20~25m of grounding body with the terminals P1 of measuring instrument；
S3: after the wiring for having carried out step S2, checking whether galvanometric pointer is directed toward center line, otherwise adjusts zero-bit adjustment
Device makes measuring instrument pointer be directed toward center line, multiplying power scale is then placed in maximum multiple, and be slowly rotated with generator turning handle, together
Shi Xuandong measurement dial makes galvanometer pointer be directed toward center line, when galvanometric pointer turns close to shake is accelerated when balancing
Handle makes its revolving speed reach 120~300r/min, while adjusting measurement dial, and pointer is made to be directed toward center line, finally calculates measurement
As a result, i.e. R be equal to multiplying power scale reading multiplied by measurement dial reading；
S4: ground resistance resistance value information is converted to analog signal by D/A converter by resistance meter after measurement finishes, together
When there is wireless communication function due to the resistance meter that uses, be converted into utilizing wireless communication module by mould after analog signal
Quasi- signal is sent to extraneous receiving instrument, and receiving instrument is converted using A/D converter after receiving analog signal, is converted into
It is performed corresponding processing again after digital signal；
S5: repeating the above steps repeatedly, take multiple measurements to ground resistance, and measurement carries out the record of data after finishing, this
When draw recording curve and record form；
S6: being finally weighted and averaged calculating for the data in step S5, and the weighted average finally used is measurement electricity
Resistance value.
2. method of Testing Earth-Contact Resistance according to claim 1, it is characterised in that: the earth resistance tester in step S1
Use condition be that environment temperature in 0~45 DEG C, relative humidity is less than or equal to 85%RH, wherein earth resistance tester
Resistance test range is 20~200 Ω, and test voltage is 0~20V.
3. method of Testing Earth-Contact Resistance according to claim 1, it is characterised in that: if measuring dial in step s3
It reads too small so that illustrating that multiplying power scale multiple is excessive when being not easy to read accurate, multiplying power scale should be placed at this time lesser
Multiple, readjusting measurement dial is directed toward pointer on center line and reads accurate reading.
4. method of Testing Earth-Contact Resistance according to claim 1, it is characterised in that: carry out ground resistance measurement it
Before, it is to be ensured that cannot nearby there be stray electrical current and polarized soil in tested earth polar, while rain rear and soil absorption moisture too
It is not capable of measuring when more and when the change dramaticallies such as weather, temperature, pressure.
5. method of Testing Earth-Contact Resistance according to claim 1, it is characterised in that: in the specific measurement process of step S2
It needs using detection needle, wherein detection needle should be far from larger metallic objects such as foggara, cable, railways, wherein electric current pole should be remote
From 10m or more, voltage pole should far from 50m or more, when such as above-mentioned metallic object is not connect with grounded screen, can shorten distance two/
One arrives one third.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910181586.9A CN109828156A (en) | 2019-03-11 | 2019-03-11 | Method of Testing Earth-Contact Resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910181586.9A CN109828156A (en) | 2019-03-11 | 2019-03-11 | Method of Testing Earth-Contact Resistance |
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| Publication Number | Publication Date |
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| CN109828156A true CN109828156A (en) | 2019-05-31 |
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ID=66868946
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910181586.9A Pending CN109828156A (en) | 2019-03-11 | 2019-03-11 | Method of Testing Earth-Contact Resistance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112213564A (en) * | 2020-09-25 | 2021-01-12 | 南方电网科学研究院有限责任公司 | Railway soil resistivity measurement method |
| CN112986690A (en) * | 2019-12-12 | 2021-06-18 | 武汉凯飞通信科技有限公司 | Grounding resistance testing method |
-
2019
- 2019-03-11 CN CN201910181586.9A patent/CN109828156A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112986690A (en) * | 2019-12-12 | 2021-06-18 | 武汉凯飞通信科技有限公司 | Grounding resistance testing method |
| CN112213564A (en) * | 2020-09-25 | 2021-01-12 | 南方电网科学研究院有限责任公司 | Railway soil resistivity measurement method |
| CN112213564B (en) * | 2020-09-25 | 2021-09-03 | 南方电网科学研究院有限责任公司 | Railway soil resistivity measurement method |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190531 |
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| WD01 | Invention patent application deemed withdrawn after publication |