CN107144772B - A kind of subway closed guard gate and rail are insulated method for testing performance - Google Patents
A kind of subway closed guard gate and rail are insulated method for testing performance Download PDFInfo
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- CN107144772B CN107144772B CN201710402422.5A CN201710402422A CN107144772B CN 107144772 B CN107144772 B CN 107144772B CN 201710402422 A CN201710402422 A CN 201710402422A CN 107144772 B CN107144772 B CN 107144772B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- General Physics & Mathematics (AREA)
- Train Traffic Observation, Control, And Security (AREA)
- Testing Of Individual Semiconductor Devices (AREA)
Abstract
The invention discloses a kind of subway closed guard gates and rail to be insulated method for testing performance, current source anode connects two rail, cathode connects stray current collection net connection terminal, and four voltage measuring apparatus are respectively placed on four rail of closed guard gate two sides, four sections of tested rail equal lengths；After energization, the voltage drop that voltage measuring apparatus measurement electric current generates when flowing through, and according to unit length rail longitudinal electrical resistance value acquire by electric current；It asks poor by closed guard gate two sides total current and obtains the electric current leaked by closed guard gate, whether the total current and electric current of closed guard gate's leakage flow through the ratio i.e. current leakage ratio of the total current before closed guard gate, by being insulated with setting value comparative assessment closed guard gate and rail.The present invention, to there may be the insulation situations of the closed guard gate of leakage and rail junction to assess, can improve the accuracy of stray electrical current leakage point investigation on the basis of the prior art checks out the serious section of stray electrical current leakage on subway line.
Description
Technical field
The present invention relates to subway power supply safety technical field, specially a kind of subway closed guard gate and rail insulating mounting property
It can detection method.
Background technique
China's electric power supply system for subway generallys use the power supply of DC1500V, DC750V standard, and train passes through pantograph from contact net
Stream is taken, or stream is taken from conductor rail by shoegear, electric current passes through rail return current to DC traction substation negative busbar.However, having
Portion of electrical current does not press above-mentioned path circulation, forms stray electrical current.Stray electrical current is by the metal structure and equipment near corrusion tunnel.
At the same time, stray electrical current will return to ground by rolling stock section's earthing pole, to the person of equipment and staff in rolling stock section
Safety belt threatens.Since stray electrical current is difficult to directly measure, usually by measure a certain section rail over the ground transition resistance with
Whether the insulating mounting situation for assessing the section rail meets the requirements.However, the test of rail transition resistance over the ground is only tested
There is higher accuracy in the biggish situation of section length.Under certain known section rail over the ground lower situation of transition resistance,
It also needs to check leakage point that may be present in section.
Since subway is set to underground more, civil air defense constructions and installations is taken into account.When encountering such as special feelings of war, natural calamity
It when condition, needs to close closed guard gate in time, guarantees tunnel and personnel safety.In the actual construction process, subway closed guard gate bottom and
Rail contact may become the leakage point of stray electrical current.
Summary of the invention
In view of the above-mentioned problems, the purpose of the present invention is to provide a kind of subway closed guard gates and rail to be insulated performance inspection
Survey method, this method are right by under the premise of the prior art checks out on subway line stray electrical current and leaks serious section
There may be the insulation situations of the closed guard gate of leakage and rail junction to assess, and improves stray electrical current leakage point investigation
Accuracy.Technical solution is as follows:
A kind of subway closed guard gate and rail are insulated method for testing performance, comprising the following steps:
Step 1: tested section is set:
It is located in the rail section on front side of closed guard gate RFM in two rail T and respectively sets a section: AB and CD；At two rail T
Section: EF and GH is respectively set in rail section on rear side of closed guard gate RFM；And AB=CD=EF=GH=L；
Step 2: connecting test equipment:
Current source CS anode is connected two rail T simultaneously to be located in the rail section on front side of closed guard gate RFM, cathode connection is spuious
Electric current collection net connection terminal DNT；
Pressure measuring unit V is connected between A and B1, pressure measuring unit V is connected between C and D2, pressure measuring unit V is connected between E and F3, between G and H
Connect pressure measuring unit V4；
Step 3: current source CS is powered, and forms back current source CS, rail T, stray current collection net DN and the earth GND
Road passes through pressure measuring unit V1、V2、V3And V4Measurement electric current passes through the voltage drop U that generates when AB, CD, EF and GH respectivelyAB、UCD、UEF
And UGH；
Step 4: r is compared in calculating current leakaged:
Calculate the electric current I for passing through AB, CD, EF and GHAB、ICD、IEFAnd IGH:
IAB=UAB/(Rt·L)；ICD=UCD/(Rt·L)；IEF=UEF/(Rt·L)；IGH=UGH/(Rt·L)；
Wherein, RtFor the every km length resistance of single steel rail；
Then electric current passes through the total current I before closed guard gate RFMb=IAB+ICD；Electric current passes through the total current after closed guard gate RFM
Ia=IEF+IGH；
It is then I by the total current that closed guard gate RFM is leakedd=Ib-Ia；
Then current leakage ratio are as follows: rd=Id/ Ib；
Step 5: judge the insulating mounting performance of closed guard gate RFM and rail T:
If rd<rs, then the insulating mounting performance of closed guard gate RFM and rail T is up to standard；
If rd>rs, then the insulating mounting performance of closed guard gate RFM and rail T is not up to standard；
Wherein, rsFor setting value.
The beneficial effects of the present invention are:
It is 1) of the invention under the premise of checking out the serious section of stray electrical current leakage on subway line by the prior art,
Stray electrical current leakage point row can be improved to there may be the insulation situations of the closed guard gate of leakage and rail junction to assess
The accuracy looked into；
2) to subway line section rail, transition resistance assessment makes the test equipment and the prior art that the present invention uses over the ground
Test equipment is identical, convenient to carry out；
3) assessment object of the invention extends to the structure and equipment of other and the contact of subway rail.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of embodiment closed guard gate in subway tunnel.
Specific embodiment
The present invention is described in further details in the following with reference to the drawings and specific embodiments.
As shown in Figure 1, including the current source CS of connection two rail T and stray current collection net connection terminal DNT, difference
It is connected to A and B, C and D, E and F, the voltage measuring apparatus V between G and H point1, V2, V3And V4, wherein AB, CD, EF, GH's
Equal length.Current source CS anode connects two rail T simultaneously, and cathode connects stray current collection net connection terminal DNT.
Current source CS is powered, current source CS, rail T, stray current collection net DN and the earth GND forming circuit, part electricity
Stream leaks to the earth by closed guard gate RFM.Voltage measuring apparatus V1, V2, V3And V4Measure respectively electric current flow through AB, CD, EF and
The voltage drop that GH is generated, the electric current for flowing through AB, CD, EF and GH are acquired by the quotient of voltage drop and rail resistance.Electric current passes through people
Total current before anti-door is the sum of the electric current for flowing through AB and CD, and electric current is to flow through EF and GH by the electric current after closed guard gate
The sum of electric current.Electric current is the total current leaked by closed guard gate RFM by the difference between currents before and after closed guard gate RFM.Current leakage
Than the ratio for being defined as flowing through the total current before closed guard gate RFM by the closed guard gate RFM total current leaked and electric current, for commenting
Estimate closed guard gate RFM and whether rail T is insulated, if current leakage ratio is lower than setting value, i.e. judgement closed guard gate RFM and rail T
Insulating mounting performance it is up to standard；If current leakage ratio is higher than setting value, that is, determine the insulating mounting of closed guard gate RFM and rail T
It can not be up to standard.
Specifically: the length of tested section AB, CD, EF and GH are L (m).Turn-on current source CS, voltage measuring apparatus
V1, V2, V3And V4Measurement electric current passes through the voltage drop U that generates when AB, CD, EF and GH respectivelyAB、UCD、UEFAnd UGH(mV).It is single
The every km length resistance R of railt(m Ω/km) has been measured by largely surveying work early period.Pass through the electric current of AB, CD, EF and GH
IAB、ICD、IEFAnd IGHIt (A) is respectively IAB=UAB/(Rt·L), ICD=UCD/(RtL), IEF=UEF/(RtL), IGH=UGH/
(Rt·L).Electric current passes through the total current I before closed guard gateb=IAB+ICD, electric current pass through closed guard gate after total current Ia=IEF+
IGH.It is that electric current passes through the difference between currents before and after closed guard gate RFM, i.e. I by the total current that closed guard gate RFM is leakedd=Ib-Ia.Electric current
Leakage is than being defined as flowing through the ratio of the total current before closed guard gate RFM by the closed guard gate RFM total current leaked and electric current, i.e.,
rd=Id/ Ib.For assessing whether closed guard gate RFM and rail T are insulated, if current leakage ratio is lower than setting value, i.e. rd<rs,
Determine that the insulating mounting performance of closed guard gate RFM and rail T is up to standard；If current leakage ratio is higher than setting value, i.e. rd>rs, that is, determine
The insulating mounting performance of closed guard gate RFM and rail T is not up to standard.
Claims (1)
1. a kind of subway closed guard gate and rail are insulated method for testing performance, which comprises the following steps:
Step 1: tested section is set:
It is located in the rail section on front side of closed guard gate RFM in two rail T and respectively sets a section: AB and CD；It is located at people in two rail T
Section: EF and GH is respectively set in rail section on rear side of anti-door RFM；And AB=CD=EF=GH=L；
Step 2: connecting test equipment:
Current source CS anode is connected two rail T simultaneously to be located in the rail section on front side of closed guard gate RFM, cathode connects stray electrical current
Collecting net connection terminal DNT；
Pressure measuring unit V is connected between A and B1, pressure measuring unit V is connected between C and D2, pressure measuring unit V is connected between E and F3, connected between G and H
Pressure measuring unit V4；
Step 3: current source CS is powered, and makes current source CS, rail T, stray current collection net DN and the earth GND forming circuit, leads to
Cross pressure measuring unit V1、V2、V3And V4Measurement electric current passes through the voltage drop U that generates when AB, CD, EF and GH respectivelyAB、UCD、UEFAnd UGH；
Step 4: r is compared in calculating current leakaged:
Calculate the electric current I for passing through AB, CD, EF and GHAB、ICD、IEFAnd IGH:
IAB=UAB/(Rt·L)；ICD=UCD/(Rt·L)；IEF=UEF/(Rt·L)；IGH=UGH/(Rt·L)；
Wherein, RtFor the every km length resistance of single steel rail；
Then electric current passes through the total current I before closed guard gate RFMb=IAB+ICD；Electric current passes through the total current I after closed guard gate RFMa=
IEF+IGH；
It is then I by the total current that closed guard gate RFM is leakedd=Ib-Ia；
Then current leakage ratio are as follows: rd=Id/ Ib；
Step 5: judge the insulating mounting performance of closed guard gate RFM and rail T:
If rd<rs, then the insulating mounting performance of closed guard gate RFM and rail T is up to standard；
If rd>rs, then the insulating mounting performance of closed guard gate RFM and rail T is not up to standard；
Wherein, rsFor setting value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710402422.5A CN107144772B (en) | 2017-06-01 | 2017-06-01 | A kind of subway closed guard gate and rail are insulated method for testing performance |
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| CN201710402422.5A CN107144772B (en) | 2017-06-01 | 2017-06-01 | A kind of subway closed guard gate and rail are insulated method for testing performance |
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| CN107144772A CN107144772A (en) | 2017-09-08 |
| CN107144772B true CN107144772B (en) | 2019-05-10 |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107976583B (en) * | 2017-11-23 | 2023-07-11 | 上海远彭电气技术咨询服务有限公司 | Automatic testing device and method for urban rail transit rail-ground transition resistance |
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| CN202383191U (en) * | 2011-12-30 | 2012-08-15 | 南京鼎尔特科技有限公司 | Sensor for detecting insulation characteristic of shielding gate in rail transit |
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| CN106569017A (en) * | 2016-11-15 | 2017-04-19 | 深圳市科安达轨道交通技术有限公司 | Rail transit stray current detection method and detection system |
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2017
- 2017-06-01 CN CN201710402422.5A patent/CN107144772B/en active Active
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| JP2004012147A (en) * | 2002-06-03 | 2004-01-15 | Kawamura Electric Inc | Insulation monitoring device and insulation monitoring method |
| CN202205059U (en) * | 2011-07-21 | 2012-04-25 | 深圳市华力特电气股份有限公司 | Stray current monitoring device for subway |
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