CN205844414U - A kind of earth resistance circuit structure measured based on split-core type meter - Google Patents
A kind of earth resistance circuit structure measured based on split-core type meter Download PDFInfo
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- CN205844414U CN205844414U CN201620800762.4U CN201620800762U CN205844414U CN 205844414 U CN205844414 U CN 205844414U CN 201620800762 U CN201620800762 U CN 201620800762U CN 205844414 U CN205844414 U CN 205844414U
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Abstract
The utility model discloses a kind of earth resistance circuit structure measured based on split-core type meter, it is included between thermal power plant's electronics the tested rack being currently running, and the earth resistance tester of a band split-core type meter, tested rack has the earthed system of self, wherein, described circuit structure also includes the test lead of a known resistance, one end of described test lead is connected an auxiliary earth point, the other end of test lead connects the ground terminal in tested rack earthed system one by one, the loop resitance value of the ground terminal in tested rack earthed system and auxiliary earth point is measured one by one with the split-core type meter of earth resistance tester, and then realize measuring the actual earth resistance of ground terminal in tested rack earthed system.This utility model improves the earth resistance efficiency of each rack of DCS control system, alleviates the labor intensity of testing crew.Use the auxiliary earth point selected by this structure reasonable simultaneously, improve the measuring accuracy of earth resistance.
Description
Technical field
This utility model relates to earth resistance, particularly to a kind of earth resistance circuit measured based on split-core type meter
Structure, is for thermal power plant DCS control system earth resistance.
Background technology
Along with the development of China's thermal power generation, fired power generating unit drops non-shut-down and has become as an important focus, ground connection electricity
Hindering as passing judgment on one of DCS equipment important evidence using safety, its importance more and more causes relevant departments (either to use
Forceful electric power or light current) attention, the requirement to the reliability of ground connection and the accuracy of grounding resistance measurement is the most urgent.At fire
After group of motors maintenance, DCS control system ground connection environment there occurs change, and workmen pulls cable during overhauling, tears the machine of dialling open
Cabinet plugging material all may cause the change of grounding resistance.What these changes all may destroy original DCS control system equipment can
It is abutted against ground.
At present the most each power plant of DCS control system is used widely, this control system to ensure power plant safety,
Economy and stable operation serve highly important effect.Environmental condition between electronics is required higher, especially by DCS control system
Require DCS rack is carried out good earth.In actual DCS control system works, although according to operating environment requirements between electronics
Instrument and equipment has been carried out good earth, but due between the complexity of earth resistance, electronics the particularity in geographical position with
And the uncertainty that after unit maintenance, artificial origin causes, system earth all may be caused defective.It is thus desirable to examine at unit
Repair period the earth resistance of DCS system rack is tested one by one.Traditional measurement method is to utilize grounding resistance measurement at present
Instrument carries out grounding resistance measurement.Need outaged equipment (preventing electric leakage electric shock) during operation and grounding clamp is disconnected, current potential is detected pin
P and gallon pin C inserts in ground respectively, makes them in alignment with earthing pole E, with tested grounding body at a distance of respectively
For 20m and 40m, and connect with wire.Open instrument and just can read tested grounding resistance.
This test mode major defect has: 1, efficiency is low, labor intensity of operating staff is bigger.Need folding and unfolding 20m every time
Wire with 40m；Need to carry instrument, wire, auxiliary earth pole.Measure an earth resistance and generally require more than 1 hour, very
To the longer time.2, measurement needs outaged equipment, and impact is normal to be produced.If not outaged equipment, in the company of off device Yu grounding body
When connecing, electrical equipment leaks electricity or has out-of-balance current, it will make device housings charged, the person peace of serious threat to operator
Entirely.3, the equipment having is welded with grounding body, does not install breaking of contact, it is impossible to separately, ground resistance measuring instrument just can not be tested.4、
Can not find soil near some equipment, entirely covered by concrete floor, the relative position of auxiliary electrode is had by earth resistance tester
It is strict with, the soil having certain distance requirement will be found, be extremely difficult, as between electronics, surrounding is cement stratum entirely, this
The situation of kind uses earth resistance tester to measure.
Summary of the invention
The purpose of this utility model is to propose a kind of earth resistance circuit structure measured based on split-core type meter, is for fire
Power DCS Control System of Power Plant system, only needs an earthing pole and an interpole to constitute test loop, uses split-core type meter to test 2 poles and return
The novel test circuit structure of road earth resistance, it is ensured that after unit maintenance, the Earthing Reliability of DCS control system rack is with accurate
Property.
To achieve these goals, the technical solution of the utility model is:
A kind of earth resistance circuit structure measured based on split-core type meter, is the earth resistance circuit knot of live line measurement
Structure, is included between thermal power plant's electronics the tested rack being currently running, and the earth resistance tester of a band split-core type meter, tested machine
Cabinet has the earthed system of self, and wherein, described circuit structure also includes the test lead of a known resistance, by described test
One end of wire connects an auxiliary earth point, and the other end of test lead connects the ground connection in tested rack earthed system one by one
Terminal, measures the ground terminal in tested rack earthed system and auxiliary earth point one by one with the split-core type meter of earth resistance tester
Loop resitance value, and then realize measuring the actual earth resistance of ground terminal in tested rack earthed system.
Scheme is further: described auxiliary earth clicks the ground connection band iron in 0 meter of power plant steam turbine room of getting fire.
The beneficial effects of the utility model are:
This utility model, by using split-core type meter to test the novel test circuit structure of 2 loop, pole earth resistances, improves DCS
The earth resistance efficiency of each rack of control system, alleviates the labor intensity of testing crew.Use selected by this structure simultaneously
The auxiliary earth point taken is reasonable, improves the measuring accuracy of earth resistance.
With embodiment, this utility model is described in detail below in conjunction with the accompanying drawings.
Accompanying drawing explanation
Fig. 1 is that this utility model tests object DCS system ground connection schematic diagram；
Fig. 2 is loop, this utility model 2 pole split-core type meter test schematic diagram.
Detailed description of the invention
A kind of earth resistance circuit structure measured based on split-core type meter, is the earth resistance circuit knot of live line measurement
Structure, as depicted in figs. 1 and 2, is included between thermal power plant's electronics the tested rack 1 being currently running, and the connecing of a band split-core type meter 201
Earth resistance tester 2, tested rack has the earthed system of self, and described earthed system primary ground structure is that DCS controls system
The signal shielding ground of each rack of system, rack safety ground, system power supply ground connection, be connected to ground connection bronze medal below rack；
In same rack, each ground connection bronze medal is bolted, and each shielding line is communicated by bronze medal in rack；The ground connection of neighboring cabinet
Bronze medal communicates by connecting conductor and cabinet base.Converge into DCS control system cable interlayer the most together to conflux bronze medal, finally
It is connected to full factory electrical grounding point.As shown in Figure 1: earthed system includes ground stud 3 nearby being connected with cabinet housing, with cabinet
The DCS ground strap 5 that middle shielding line ground connection 4 connects, and the ground stud 6 being connected with ground strap；Wherein, described circuit
Structure also includes the test lead 7 of a known resistance, and one end of described test lead connects an auxiliary earth point, test
The other end of wire connects the ground terminal in tested rack earthed system one by one, surveys one by one with the split-core type meter of earth resistance tester
Measuring the loop resitance value of the ground terminal in tested rack earthed system and auxiliary earth point, circuit structure only uses band pincers
The earth resistance tester of table, the test lead of root length degree line enough, a known resistance just can complete all racks of DCS control system
Earth resistance；And then realize measuring the actual earth resistance of ground terminal in tested rack earthed system.
In embodiment: described auxiliary earth clicks the ground connection band iron in 0 meter of power plant steam turbine room of getting fire, arrange in Factory Building
Ground connection, general Factory Building is provided with such earth point, chooses 0 meter of electrical grounding nearby without then starting to arrange；Described
Auxiliary earth clicks 0 meter of power plant steam turbine room ground connection band iron of getting fire, and this position must prevent electromagnetism from doing away from large-capacity electrical apparatus
Disturb and cause test data inaccurate.
Its method is: for need test DCS control system rack, as FSSS, DEH, MEH, ETS, METS, TSI,
MTSI, BSCS, TSCS, MCS rack.At 0 meter of service ground band iron of tested relevant rack steam turbine building selected around as auxiliary
Help test grounding body.Described test lead test lead alignment needs the DCS rack Bottom ground bronze medal of test, and the other end is fixed on
On 0 meter of ground connection band iron of steam turbine building, by a test lead, (0 meter of ground connection of steam turbine building is flat only to choose an auxiliary earth point
Ferrum), connect and compose closed-loop path by tested end and auxiliary earth point, test the grounding resistance of each DCS rack one by one.
Measured body earth resistance and the series value of test cable resistance is recorded with the earth resistance tester of band split-core type meter.Then will test electricity
Cable joins end to end and can record test cable resistance, and the difference of two resistances is measured body grounding resistance.By the method one by one
The rack earth resistance of test DCS control system；Grounding resistance measurement loop owing to building is reasonable, and the auxiliary earth chosen
O'clock at 0 meter near ground stud, resistance value is the least, little on the impact of earth resistance test result.
Claims (2)
1. the earth resistance circuit structure measured based on split-core type meter, is the earth resistance circuit knot of live line measurement
Structure, is included between thermal power plant's electronics the tested rack being currently running, and the earth resistance tester of a band split-core type meter, tested machine
Cabinet has the earthed system of self, it is characterised in that described circuit structure also includes the test lead of a known resistance, by institute
The one end stating test lead connects an auxiliary earth point, and the other end of test lead connects in tested rack earthed system one by one
Ground terminal, the ground terminal measured one by one in tested rack earthed system with the split-core type meter of earth resistance tester connects with auxiliary
The loop resitance value in place, and then realize measuring the actual earth resistance of ground terminal in tested rack earthed system.
Earth resistance circuit structure the most according to claim 1, it is characterised in that described auxiliary earth clicks gets fire
The ground connection band iron in 0 meter of power plant steam turbine room.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620800762.4U CN205844414U (en) | 2016-07-28 | 2016-07-28 | A kind of earth resistance circuit structure measured based on split-core type meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620800762.4U CN205844414U (en) | 2016-07-28 | 2016-07-28 | A kind of earth resistance circuit structure measured based on split-core type meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205844414U true CN205844414U (en) | 2016-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620800762.4U Expired - Fee Related CN205844414U (en) | 2016-07-28 | 2016-07-28 | A kind of earth resistance circuit structure measured based on split-core type meter |
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| Country | Link |
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| CN (1) | CN205844414U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108445290A (en) * | 2018-03-14 | 2018-08-24 | 北京无线电计量测试研究所 | A kind of closed loop resistance device resistance value measurement method |
| CN109856460A (en) * | 2019-01-24 | 2019-06-07 | 国网山东省电力公司日照供电公司 | A kind of power distribution station grounding resistor monitoring system and monitoring method |
-
2016
- 2016-07-28 CN CN201620800762.4U patent/CN205844414U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108445290A (en) * | 2018-03-14 | 2018-08-24 | 北京无线电计量测试研究所 | A kind of closed loop resistance device resistance value measurement method |
| CN109856460A (en) * | 2019-01-24 | 2019-06-07 | 国网山东省电力公司日照供电公司 | A kind of power distribution station grounding resistor monitoring system and monitoring method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161228 Termination date: 20180728 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |