CN100394204C - Method for detecting ground wire of power transmission and distribution system - Google Patents
Method for detecting ground wire of power transmission and distribution system Download PDFInfo
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- CN100394204C CN100394204C CNB2005100683964A CN200510068396A CN100394204C CN 100394204 C CN100394204 C CN 100394204C CN B2005100683964 A CNB2005100683964 A CN B2005100683964A CN 200510068396 A CN200510068396 A CN 200510068396A CN 100394204 C CN100394204 C CN 100394204C
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Abstract
The present invention discloses a method for detecting a ground wire of a power transmission and distribution system. The present invention has the following steps: (1) when the present invention is used for detecting an earth wire of a wire tower pole when a measuring meter is used for measuring the resistance of one earth wire of each tower foot or each pole foot, other earth wires of the tower foot or the pole foot are loosened; when the present invention is used for detecting an earth wire of electric equipment at a base station, the measuring meter is used for measuring the resistance of a neutral earth wire of the electric equipment; (2) when the measured resistance of the earth wire of each time is the same as the measured resistance of the earth wire of other times and the reading of the measuring meter is stable, namely a stable value within a specified range, the earth wire is qualified; when the measured resistance of the earth wire of each time is different from the measured resistance of the earth wire of other times and the reading of the measuring meter is not stable, namely a not stable value, the earth wire is unqualified; when the measured resistance of the earth wire is 0.7 ohm or 0.9 ohm each time, namely a common value, the earth wire is unqualified. The present invention uses 0.7 ohm and 0.9 ohm to detect whether earth wires in a substation and a power plant use one earth wire in parallel or not. The present invention is suitable for detecting earth wires of electric equipment with middle, high and ultra high voltage.
Description
Technical field
The present invention relates to a kind of detection of electrical power trans mission/distribution system, be meant method for detecting ground wire of power transmission and distribution system especially.
Background technology
Before the present invention makes, when being used for the rod grounded line of electrical power trans mission/distribution system circuit tower and detecting, when measuring ground lead resistance of column foot or bar pin with the meter tool, untie other ground wire of column foot or bar pin, even if adhere to specification qualifiedly as long as it records number, whether lean against in the backguy as for ground wire, whether be connected with the iron body that column foot or bar pin stay when the construction, and problem such as connector lug loose contact, do not take in.When being used for base station electrical equipment ground wire and detecting, comprise the electrical equipment of transformer station, generating plant, have the electrical equipment of neutral coil, neutral ground as transformer, lightning arrester, oil switch, mutual inductor etc., as long as and with a ground wire; In case one of them device damage or experience thundery sky, then one of them equipment discharges over the ground and will impact another electrical equipment from ground wire, be associated in an electrical equipment burning or a blast on the ground wire mutually thereby make; Such accident has taken place in a transformer station, will impact one or next transformer station and generating plant, and electrical network is destroyed, and causes the serious power outage of large tracts of land.Whether and the method that in the past detected the electrical equipment ground wire is only to the ground wire of single equipment qualified detection the whether, be in parallel as for the ground wire of adjacent electrical equipment and do not consider.As " construction of 110-500KV overhead power line and acceptance specification (GBJ233-90) " chapter 8 earth work of national standard announcement in 1991, just do not mention the detection problem of adjacent electrical equipment ground wire.
Summary of the invention
Technical matters to be solved by this invention is to avoid above-mentioned deficiency of the prior art, and propose a kind of easy and simple to handle, applicability is strong, whether qualified, and can measure the method for detecting ground wire of power transmission and distribution system whether adjacent electrical equipment ground wire is in parallel if can not only measure on the circuit the rod grounded line of tower.
Technical scheme provided by the present invention is:
When it comprises the following steps: that (1) is used for the rod grounded line of circuit tower and detects, when measuring ground lead resistance of column foot or bar pin, untie other ground wire of column foot or bar pin with the meter tool; When being used for base station electrical equipment ground wire detection, measure electrical equipment neutral ground line resistance with the meter tool; It is characterized in that: (2) when the ground lead resistance that at every turn records identical, meter tool stable reading, i.e. during stationary value, and the stationary value in the design code scope, ground wire is qualified; Inequality when the ground lead resistance that records at every turn, when meter tool reading instability, promptly unstable definite value, ground wire is defective; When the ground lead resistance that records is 0.7 ohm or 0.9 ohm at every turn, promptly during common value, ground wire is defective.
Described base station electrical equipment ground wire detects further comprising the steps of:
(1) makes the plain conductor step: the clip that is used to connect other metallic object is installed respectively at the lead two ends;
(2) detect step: clip is clipped in respectively on the adjacent electrical equipment neutral ground line, then, uses ground lead resistance meter tool to detect at the plain conductor middle part;
(3) determining step: when to record ground lead resistance be 0.7 ohm of common value, adjacent two electrical equipment ground wires were in parallel, and adjacent two equipment lean on closely; When common value was 0.9 ohm, adjacent two electrical equipment ground wires were in parallel, and adjacent two equipment lean on far; When the reading of meter tool is unstable definite value, the loose contact of ground connection the end of a thread, gapped; When to record ground lead resistance be stationary value in the specialized range, ground wire was qualified, and the ground wire of adjacent electrical equipment records 0.7 ohm, 0.9 ohm, proved that two electrical grounding lines are in parallel, and two electrical grounding lines must separate.
Stationary value in the described specialized range is greater than 0.7 ohm, and two electrical equipments are in 5 meters, and ground wire is qualified; When greater than 0.9 ohm, and two electrical equipments are at a distance of more than 10 meters, and ground wire is qualified; When arbitrary stationary value in 5 to 10 ohm, ground wire is good ground wire; When recording ground lead resistance greater than 10 ohm, ground wire is defective.
Described base station comprises transformer station, generating plant.
Described plain conductor is 6 square millimeters a copper conductor, and a clip is respectively welded at two.
Described ground lead resistance meter tool adopts liquid crystal card table.
The present invention has following advantage: (1) because easy and simple to handle, and it is low to have a cost of detection, the characteristics of high efficiency; (2) overcome the electrical power trans mission/distribution system rod grounded line detection of tower on the line erroneous judgement problem; (3) since overcome prior art in the generating plant, transformer station only measures the prejudice of single electrical equipment ground wire, therefore solved to have the erroneous judgement problem that adjacent electrical equipment detects, checks and accepts; (4) whether qualified in the present invention if not only can directly detect the electrical equipment ground wire, and for the detection of electrical equipment ground wire provides the examination evaluation criterion, can record out the ground wire construction is shoddy engineering or high grade project; (5) the present invention does not influence normal circuit operation in implementing the process that detects.
Description of drawings
Fig. 1 is a base station of the present invention adjacent electrical equipment ground wire testing principle schematic;
Fig. 2 is a transformer grounding line synoptic diagram;
Fig. 3 is an arrester ground line synoptic diagram;
Fig. 4 is single electrical equipment ground wire synoptic diagram;
Fig. 5 is single electrical equipment ground wire synoptic diagram;
Fig. 6 is the circuit type tower grounding line synoptic diagram of calling;
Fig. 7 is an iron tower four directions ray type ground wire synoptic diagram.
Illustrate: 1,2,3,4,10 electrical equipments, 5,6 copper conductors, 7 shared grounding lines, 8 neutral ground lines, 9 single ground wires, 11 liquid crystal card tables, 12 crocodile electrical terminals, 13 lightning arresters, 14 H-frame pole towers, 15 backguys, the single ray type of 16 H-frame pole towers ground wire, 17 iron towers, 18 iron bodies, 19 four directions networking ray type ground wires, 20 iron wires.
Embodiment
Below in conjunction with description of drawings the specific embodiment of the present invention.
Described stationary value is the value that table tool reading does not change, and only meets design, is only qualified ground wire less than design; Described unstable definite value is the value that table tool reading can't be determined, the connection of such reading explanation ground connection the end of a thread is insecure, has produced the gap, and the reading change is little, and the gap is little, and the reading change is big, and the gap is just big; 0.7,0.9 two numerical value are called common value, its implication is: when measuring the shaft tower ground lead resistance with the table tool, untie the ground connection terminal, to record number all be not same reading with not untiing the ground wire terminal to record number, is common value.
As Fig. 6, shown in Figure 7, the detection of the rod grounded line of tower utilizes the embodiment of common value on the circuit.
1) 35-500 kilovar, H-frame pole tower 14 single ray type ground wires 16, with single ray networking ground wire, the reading that records ground wire is 0.9 ohm, be common value, ground wire leans against in the backguy 15, belongs to defective ground wire, must separate ground wire 16 and backguy 15, just can measure qualified resistance value.The lightning disturbance that China occurs on this circuit is very frequent, and its main cause comes from constructional deficiency.
2) 110-500 kilovar, four pin iron towers 17 are four directions networking ray type ground wires 19, and the reading that records ground wire is 0.7 ohm, is common value, belongs to defective ground wire.
When recording unstable reading,, be called unstable common value as 0.9～0.1 ohm, 0.7～0.1 ohm.
Common value and unstable common value occur, illustrate that ground wire leans against in the backguy 15 in construction, or column foot inside there are an iron wire 20 or iron body 18 when constructing.Have only to remove to ride on the ground wire or lean against iron wire 20 on the column foot, just can measure correct stationary value, thereby, erroneous judgement avoided.
As Fig. 1, Fig. 2, Fig. 3, Fig. 4, shown in Figure 5, the base station is as the embodiment of transformer station, the detection of power plant electricity equipment ground line.At first, be processed into the lead of 5 meters, 10 meters, 20 meters different lengths with 6 square millimeters multiply copper conductors 5,6, a crocodile electrical terminal 12 is respectively welded at two, and clip is clipped in respectively on adjacent electrical equipment 1,2,3,4, the 13 neutral ground lines; Then, use the neutral ground line of pair every adjacent two electrical equipments 1,2,3,4,13 of liquid crystal card table 11 to detect one by one.When recording ground lead resistance and be 0.7 ohm, adjacent two electrical equipments link as transformer 2, lightning arrester 13 ground wires, and promptly the shared grounding line 7, and adjacent two equipment lean on very closely; When recording ground lead resistance and be 0.9 ohm, adjacent two electrical equipments, 1,3 ground wires link, and promptly the shared grounding line 7, and adjacent two equipment lean on far; When the reading of liquid crystal card table 11 is unstable, the ground wire loose contact, gapped, or lean against on another ground wire; When recording ground lead resistance greater than 0.7 ohm, and two electrical equipments are in 5 meters, and ground wire is qualified; When recording ground lead resistance greater than 0.9 ohm, and two electrical equipments are at a distance of more than 10 meters, and ground wire is qualified; When recording ground lead resistance is in 5 to 10 ohm during arbitrary stationary value, and ground wire is good ground wire; When recording ground lead resistance greater than 10 ohm, ground wire is defective.Single ground wire 9 resistance of single equipment 10 are qualified ground wires greater than 0.7 ohm or 0.9 ohm.
The present invention is fit to the detection of mesohigh, the electric equipment ground line of UHV (ultra-high voltage).
This detection method also is useful for: Aero-Space, national defense and military, post and telecommunications, mobile communication, the technical method of the lightning protection earthing line of causes such as the building construction of city, industrial and mineral and the construction of neutral ground line, maintenance, detection.
Claims (6)
1. method for detecting ground wire of power transmission and distribution system when it comprises the following steps: that (1) is used for the rod grounded line of circuit tower and detects, when measuring ground lead resistance of column foot or bar pin with the meter tool, is untied other ground wire of column foot or bar pin; When being used for base station electrical equipment ground wire detection, measure electrical equipment neutral ground line resistance with the meter tool; It is characterized in that: (2) when the ground lead resistance that at every turn records identical, meter tool stable reading, i.e. during stationary value, and the stationary value in the design code scope, ground wire is qualified; Inequality when the ground lead resistance that records at every turn, when meter tool reading instability, promptly unstable definite value, ground wire is defective; When the ground lead resistance that records is 0.7 ohm or 0.9 ohm at every turn, promptly during common value, ground wire is defective.
2. method for detecting ground wire of power transmission and distribution system according to claim 1 is characterized in that: described base station electrical equipment ground wire detects further comprising the steps of:
(1) makes the plain conductor step: the clip that is used to connect other metallic object is installed respectively at the lead two ends;
(2) detect step: clip is clipped in respectively on the adjacent electrical equipment neutral ground line, then, uses ground lead resistance meter tool to detect at the plain conductor middle part;
(3) determining step: when to record ground lead resistance be 0.7 ohm of common value, adjacent two electrical equipment ground wires were in parallel, and adjacent two equipment lean on closely; When common value was 0.9 ohm, adjacent two electrical equipment ground wires were in parallel, and adjacent two equipment lean on far; When the reading of meter tool is unstable definite value, the loose contact of ground connection the end of a thread, gapped; When to record ground lead resistance be stationary value in the specialized range, ground wire was qualified; And the ground wire of adjacent electrical equipment records 0.7 ohm, 0.9 ohm, proves that two electrical grounding lines are in parallel, and two electrical grounding lines must separate.
3. method for detecting ground wire of power transmission and distribution system according to claim 1 and 2 is characterized in that: the stationary value in the described design code scope is greater than 0.7 ohm, and two electrical equipments are in 5 meters, and ground wire is qualified; When greater than 0.9 ohm, and two electrical equipments are at a distance of more than 10 meters, and ground wire is qualified; When arbitrary stationary value in 5 to 10 ohm, ground wire is good ground wire; When recording ground lead resistance greater than 10 ohm, ground wire is defective.
4. method for detecting ground wire of power transmission and distribution system according to claim 1 and 2 is characterized in that: described base station comprises transformer station, generating plant.
5. method for detecting ground wire of power transmission and distribution system according to claim 2 is characterized in that: described plain conductor is 6 square millimeters a copper conductor.
6. method for detecting ground wire of power transmission and distribution system according to claim 1 and 2 is characterized in that: described meter tool adopts liquid crystal card table.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100683964A CN100394204C (en) | 2005-05-10 | 2005-05-10 | Method for detecting ground wire of power transmission and distribution system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100683964A CN100394204C (en) | 2005-05-10 | 2005-05-10 | Method for detecting ground wire of power transmission and distribution system |
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| Publication Number | Publication Date |
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| CN1862271A CN1862271A (en) | 2006-11-15 |
| CN100394204C true CN100394204C (en) | 2008-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100683964A Expired - Fee Related CN100394204C (en) | 2005-05-10 | 2005-05-10 | Method for detecting ground wire of power transmission and distribution system |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103472352B (en) * | 2013-09-16 | 2016-11-23 | 国家电网公司 | A kind of ground wire testing method |
| CN106771637B (en) * | 2016-10-27 | 2019-06-25 | 苏海锋 | Electric line inspection earthing threadiness state on-line monitoring method |
| CN106597213B (en) * | 2016-11-11 | 2019-11-19 | 华北电力大学（保定） | Distributed electric line upkeep operation safeguard protection digitized monitoring system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5934169A (en) * | 1982-08-19 | 1984-02-24 | Mitsubishi Electric Corp | Fault detecting device |
| US4866391A (en) * | 1988-05-12 | 1989-09-12 | James G. Biddle Co. | System and method of simultaneously measuring a multiplicity of grounds on utility poles |
| CN2086419U (en) * | 1991-01-24 | 1991-10-09 | 朱少武 | Anti-jointing switch with ground wire checking unit |
| JP2000206162A (en) * | 1999-01-11 | 2000-07-28 | Ntt Power & Building Facilities Inc | Method and system for measuring grounding resistance |
| CN2549476Y (en) * | 2002-05-30 | 2003-05-07 | 田一鸣 | Power transmission circuit ground lead monitor |
-
2005
- 2005-05-10 CN CNB2005100683964A patent/CN100394204C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5934169A (en) * | 1982-08-19 | 1984-02-24 | Mitsubishi Electric Corp | Fault detecting device |
| US4866391A (en) * | 1988-05-12 | 1989-09-12 | James G. Biddle Co. | System and method of simultaneously measuring a multiplicity of grounds on utility poles |
| CN2086419U (en) * | 1991-01-24 | 1991-10-09 | 朱少武 | Anti-jointing switch with ground wire checking unit |
| JP2000206162A (en) * | 1999-01-11 | 2000-07-28 | Ntt Power & Building Facilities Inc | Method and system for measuring grounding resistance |
| CN2549476Y (en) * | 2002-05-30 | 2003-05-07 | 田一鸣 | Power transmission circuit ground lead monitor |
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| CN1862271A (en) | 2006-11-15 |
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Granted publication date: 20080611 Termination date: 20120510 |