CN105548759B - A kind of current-carrying capacity of cable test method - Google Patents
A kind of current-carrying capacity of cable test method Download PDFInfo
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- CN105548759B CN105548759B CN201510963152.6A CN201510963152A CN105548759B CN 105548759 B CN105548759 B CN 105548759B CN 201510963152 A CN201510963152 A CN 201510963152A CN 105548759 B CN105548759 B CN 105548759B
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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
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Abstract
The present invention relates to a kind of current-carrying capacity of cable test methods, include the following steps：By the test cable plate-like perforation across concrete frame of bending repeatedly；Temperature survey is carried out outside the 300mm of test cable periphery；It is powered to test cable, to the cable at perforation into trip temperature and current measurement；Cause temperature stabilization at 90 DEG C ± 1 DEG C, and record all temperature Tc data and current Data in its latter minute；When the last electric current occur disturbance already exceed 3 it is small when reach equilibrium state, record temperature Tc data and current Data and test cable powered off；It is re-energised after plugging material at perforation；It is no more than one minute to the test cable at perforation into trip temperature and current measurement per minor tick by thermocouple, to gained current data IfIt is recorded and is handled, obtain normative testing electric current I ' and current-carrying capacity drop volume coefficient ADF.Compared with the prior art, the configuration of the present invention is simple, easy to operate, data test is accurate.
Description
Technical field
The present invention relates to cable testing technology field, more particularly to a kind of current-carrying capacity of cable test method.
Background technology
Wireline test is the corresponding factor in order to determine to influence cable penetration fireproof plugging structure current-carrying capacity drop volume.Test according to
The IEEE 848 passed through is audited within 5th according to Institute of Electrical and Electric Engineers August in 1996《Fireproof cable current-carrying capacity drop volume standard is surveyed
Determine program》It carries out；Test device of the prior art is complicated, and measuring accuracy is bad, and it is big to frequently result in test error, influences
Product quality.
Invention content
The technical problems to be solved by the invention be to provide it is a kind of it is simple in structure, easy to operate, data test is accurately electric
Cable current-carrying weight testing method.
The technical solution that the present invention solves above-mentioned technical problem is as follows：A kind of current-carrying capacity of cable test device, including coagulation
Native frame, is provided with perforation in the middle part of the concrete frame, and test cable passes through the perforation, pourable envelope in the perforation
The plugging material of the perforation is blocked up, the both sides of the perforation are both provided with the cable testing bridge for placing test cable, the survey
Try cable tight solid matter cloth, dislocation be placed on cable testing bridge, be provided on the test cable it is multiple to the test cable into
The thermocouple of row thermometric, is provided with temperature measuring point at the 300mm apart from the test cable, and the lower end of the concrete frame is set
It is equipped with and is provided with insulating protective plate.
The beneficial effects of the invention are as follows：The temperature at perforation can be detected by multiple thermocouples so that temperature is protected
Holding can ensure that space enrironment is maintained in the range of 40 ± 2 DEG C in 90 DEG C of ± 1 DEG C of temperature measuring points to the thermometric around place so that
Test environment is stablized, and can effectively promote the precision of follow-up test, and simple in structure, easy to operate, can effectively reduce test into
This.
Based on the above technical solution, the present invention can also be improved as follows.
Further, the test cable and is sealed not with the EDGE CONTACT of perforation at two port with insulating materials.
Advantageous effect using above-mentioned further scheme is：Ensure that the heat of cable in test does not pass through copper conductor and perforation
Edge be conducted into air environment, promote the accuracy of data test.
Further, the test cable has been laid with three layers on the cable testing bridge, and bottom test cable and middle level are surveyed
Examination cable is fully loaded with arrangement, and the cable number of top layer's test cable is the 40% of bottom test cable and middle level test cable, is concentrated
It is arranged in the center on the cable testing bridge upper strata.Further, the test cable is connect with single phase poaer supply, and the test cable is also
It is connected with galvanometer.
Advantageous effect using above-mentioned further scheme is：Galvanometer can effectively test the electric current in cable, carry
Rise data test accuracy.
Further, multiple thermocouples are the thermocouple of corronil.
Advantageous effect using above-mentioned further scheme is：The thermocouple of corronil is accurate to the temperature of wireline test,
The influence of external environment can effectively be avoided.
Further, the insulating protective plate is wooden plywood, and the plugging material is silicone rubber.
Advantageous effect using above-mentioned further scheme is：Wooden plywood can effectively insulate, and promote test data
Precision.
Further, the test cable plate-like perforation across in the middle part of concrete frame of bending repeatedly, bending part lead to
Clamp is crossed to be fixed.
Advantageous effect using above-mentioned further scheme is：Clamp can effectively fix test cable, promote number
According to the stability of test.
Another technical solution that the present invention solves above-mentioned technical problem is as follows：A kind of current-carrying capacity of cable test method, including
Following steps：
Step S1. is by the test cable plate-like perforation across in the middle part of concrete frame of bending repeatedly, and test cable is rolled over
Crook is fixed by clamp；
Step S2. carries out temperature survey outside the 300mm of test cable periphery by temperature measuring point, regulates and controls the temperature of test site
Spend Ta so that temperature measuring point measured temperature is controlled in the range of 40 ± 2 DEG C；
Step S3. single phase poaer supplies are powered to test cable, and the cable at perforation is surveyed into trip temperature by thermocouple
Amount and current measurement；
Step S4. adjusts single phase poaer supply to test cable output current so that thermocouple measured temperature stabilization is at 90 DEG C ± 1
DEG C, and record obtained all temperature Tc data and current Data in its latter minute；
Step S5. occurs reaching equilibrium state when disturbance alreadys exceed small when the last current regulation or system, records
Temperature Tc data and current Data simultaneously power off test cable；
Step S6. carries out cast plugging material at perforation, is re-energised；It is no more than one point per minor tick by thermocouple
The time of clock carries out the test cable at perforation temperature survey and current measurement, and is monitored and electric current number to measuring temperature
According to IfIt is recorded；
Step S7, to the current data I testedfData processing is carried out, obtains normative testing electric current I ' and current-carrying capacity drop volume
Coefficient ADF.
The beneficial effects of the invention are as follows：The temperature at perforation can be detected by multiple thermocouples so that temperature is protected
It holds at 90 DEG C ± 1 DEG C, temperature measuring point can ensure that space enrironment is maintained in the range of 40 ± 2 DEG C to the thermometric around place so that
Test environment is stablized, and can effectively promote the precision of follow-up test, and simple in structure, easy to operate, can effectively reduce test into
This.
Further, in the step S7 normative testing electric current I ' specific implementation：
Wherein：
Test electric current during I equilibrium state, unit ampere；
Center most thermal conductivity temperature, unit DEG C during Tc equilibrium state；
The test site environment temperature that Ta is measured, unit DEG C；
Electric current after I ' specifications, unit ampere；
Conductor temperature=90 DEG C after Tc ' specifications；
Environment temperature=40 DEG C after Ta ' specifications；
α values 234.5 represent the temperature-coefficient of electrical resistance of copper.
Further, in the step S7 current-carrying capacity drop volume coefficient ADF specific implementation：
Wherein：I0Benchmark test electric current after specification, unit ampere；
IfCurrent data, unit ampere；
Volume coefficient, % drop in ADF current-carrying capacity of cable.
Advantageous effect using above-mentioned further scheme is：ADF data processings are accurate, promote data-handling efficiency.
Description of the drawings
Fig. 1 is a kind of front view of current-carrying capacity of cable test device of the present invention；
Fig. 2 is a kind of structure diagram of current-carrying capacity of cable test device of the present invention；
Fig. 3 is a kind of vertical view of current-carrying capacity of cable test device of the present invention；
Fig. 4 is a kind of flow chart of current-carrying capacity of cable test method of the present invention.
In attached drawing, parts list represented by the reference numerals are as follows：
1st, concrete frame, 2, test cable, 3, plugging material, 4, cable testing bridge, 5, insulating protective plate, 6, clamp.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
As shown in Figure 1 to Figure 3, a kind of current-carrying capacity of cable test device, including concrete frame 1, the concrete frame 1
Middle part be provided with perforation, test cable 2 passes through the perforation, the pourable plugging material for blocking the perforation in the perforation
3, the both sides of the perforation are both provided with the cable testing bridge 4 for placing test cable 2, and the test cable 2 is closely arranged, wrong
Position is placed on cable testing bridge 4, and multiple thermocouples that thermometric is carried out to the test cable 2 are provided on the test cable 2,
Temperature measuring point is provided at the 300mm apart from the test cable 2, the lower end of the concrete frame 1 is provided with absolutely
Edge protective plate 5.
Temperature in test site should be controlled in the range of 40 ± 2 DEG C；It is horizontal in the distance apart from test specimen 300mm
Direction sets at least three temperature measuring point, and the ground of test site can use wooden plywood's insulating protection of 20mm thickness；Have in test site
Necessity is quoted artificial air and is flowed so that temperature can reach balanced stabilization.It should be noted that air-flow is avoided to be directly blown onto test specimen
On, it avoids the radiation effects due to pyrotoxin and increases cable additional hot load.
It is 1 × 120mm that current-carrying capacity of cable, which is tested using (but not limited to),2Copper core, 8.7/15KV are ethylene propylene rubber insulated, warm
Solidity sheath, low-smoke halogen-free cable；The method is equally applicable to other model cables；
Test the uncovered trapezoidal bridge frame used, crane span structure 106mm high 610mm wide.Crane span structure is at the position of hole 300mm
It disconnects, extends at least 3000mm on length direction from hole central point to both sides.The cable single-layered of tested person is arranged in crane span structure
It is interior, the width of a cable size is spaced between every two.It copes with cable at hole to be supported, to avoid in test process
Cable, which hangs low, directly falls in concrete frame surface.
Test material is the silicone rubber of thickness 305mm.
Concrete frame size be 1830mm × 1322mm × 305mm, density 2.3g/cm3, bore size for 102mm ×
610mm。
String diameter 0.5mm, T grade, the thermocouple of corronil are selected, accuracy is ± 0.5 DEG C.Thermocouple electric wire should have waterproof
Insulation, when thermometric, are directly placed on cable copper core.It cuts the notch of about 25mm long respectively on cable cover(ing) and insulating layer, reveals
Go out internal conductor.Thermocouple is inserted between cable conductor core wire and is in direct contact therewith.Cutting on closure sheath and insulating layer
Mouthful, with single layer dielectrics rubber belt sealing.Horizontally disposed 5 thermocouples on the cable conductor of hole center vertical cross-section position.Most
An intermediate cable arranges an additional thermocouple to both sides since hole central cross-section position every 600mm.
Preferably, the test cable 2 not with the EDGE CONTACT of perforation, and at two port with insulating materials it is close
Envelope.
Preferably, the test cable 2 has been laid with three layers, and bottom test cable 2 and middle level on the cable testing bridge 4
The fully loaded arrangement of test cable 2, the cable number of top layer's test cable 2 is bottom test cable 2 and middle level test cable 2
40%, concentrate the center for being arranged in 4 upper strata of cable testing bridge.
Preferably, the test cable 2 is connect with single phase poaer supply, and the test cable 2 is also associated with galvanometer.
Preferably, multiple thermocouples are the thermocouple of corronil.
Preferably, the insulating protective plate 5 is wooden plywood, and the plugging material 3 is silicone rubber.
Preferably, the test cable 2 plate-like perforation across 1 middle part of concrete frame of bending repeatedly, bending part
It is fixed by clamp 6.
As shown in figure 4, a kind of current-carrying capacity of cable test method, includes the following steps：
Step S1. is by the plate-like perforation across the middle part of concrete frame 1 of bending repeatedly of test cable 2, and test cable 2
Bending part is fixed by clamp 6；
Step S2. carries out temperature survey outside the 300mm of 2 periphery of test cable by temperature measuring point, regulates and controls test site
Temperature Ta so that temperature measuring point measured temperature is controlled in the range of 40 ± 2 DEG C；
Step S3. single phase poaer supplies are powered to test cable 2, and the cable at perforation is surveyed into trip temperature by thermocouple
Amount and current measurement；
Step S4. adjusts single phase poaer supply to 2 output current of test cable so that thermocouple measured temperature stabilization 90 DEG C ±
1 DEG C, and record obtained all temperature Tc data and current Data in its latter minute；
Step S5. when the last current regulation or system occur disturbance already exceed 3 it is small when reach equilibrium state, record
Temperature Tc data and current Data simultaneously power off test cable 2；
Step S6. carries out cast plugging material 3 at perforation, is re-energised；It is no more than one per minor tick by thermocouple
Minute time carry out temperature survey and current measurement to the test cable 2 at perforation, and be monitored and electricity to measuring temperature
Flow data IfIt is recorded；
Step S7, to the current data I testedfData processing is carried out, obtains normative testing electric current I ' and current-carrying capacity drop volume
Coefficient ADF.
Preferably, in the step S7 normative testing electric current I ' specific implementation：
Wherein：
Test electric current during I equilibrium state, unit ampere；
Center most thermal conductivity temperature, unit DEG C during Tc equilibrium state；
The test site environment temperature that Ta is measured, unit DEG C；
Electric current after I ' specifications, unit ampere；
Conductor temperature=90 DEG C after Tc ' specifications；
Environment temperature=40 DEG C after Ta ' specifications；
α values 234.5 represent the temperature-coefficient of electrical resistance of copper.
Preferably, in the step S7 current-carrying capacity drop volume coefficient ADF specific implementation：
Wherein：I0Benchmark test electric current after specification, unit ampere；
IfCurrent data, unit ampere；
Volume coefficient, % drop in ADF current-carrying capacity of cable.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (3)
1. a kind of current-carrying capacity of cable test method, which is characterized in that include the following steps：
Step S1. is by test cable (2) the plate-like perforation across in the middle part of concrete frame (1) of bending repeatedly, and test cable
(2) bending part is fixed by clamp (6)；
The outer temperature that temperature survey is carried out by temperature measuring point, regulates and controls test site of 300mms of the step S2. in test cable (2) periphery
Spend Ta so that temperature measuring point measured temperature is controlled in the range of 40 ± 2 DEG C；
Step S3. single phase poaer supplies are powered to test cable (2), and temperature survey is carried out to the cable at perforation by thermocouple
And current measurement；
Step S4. adjusts single phase poaer supply to test cable (2) output current so that thermocouple measured temperature stabilization is at 90 DEG C ± 1
DEG C, and record obtained all temperature Tc data and current Data in its latter minute；
Step S5. when the last current regulation or system occur disturbance already exceed 3 it is small when reach equilibrium state, record temperature
Tc data and current Data simultaneously power off test cable (2)；
Step S6. carries out cast plugging material (3) at perforation, is re-energised；It is no more than one point per minor tick by thermocouple
The time of clock carries out the test cable (2) at perforation temperature survey and current measurement, and is monitored and electricity to measuring temperature
Flow data IfIt is recorded；
Step S7, to the current data I testedfData processing is carried out, obtains normative testing electric current I ' and current-carrying capacity drop volume coefficient
ADF。
A kind of 2. current-carrying capacity of cable test method according to claim 1, which is characterized in that normative testing in the step S7
The specific implementation of electric current I '：
Wherein：
Test electric current during I equilibrium state, unit ampere；
Center most thermal conductivity temperature, unit DEG C during Tc equilibrium state；
The test site environment temperature that Ta is measured, unit DEG C；
Electric current after I ' specifications, unit ampere；
Conductor temperature=90 DEG C after Tc ' specifications；
Environment temperature=40 DEG C after Ta ' specifications；
α values 234.5 represent the temperature-coefficient of electrical resistance of copper.
3. a kind of current-carrying capacity of cable test method according to claim 2, which is characterized in that current-carrying capacity drops in the step S7
The specific implementation of volume coefficient ADF：
Wherein：I0Benchmark test electric current after specification, unit ampere；
IfCurrent data, unit ampere；
Volume coefficient, % drop in ADF current-carrying capacity of cable.
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| CN201510963152.6A CN105548759B (en) | 2015-12-18 | 2015-12-18 | A kind of current-carrying capacity of cable test method |
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| CN105548759B true CN105548759B (en) | 2018-07-06 |
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| CN112881850B (en) * | 2021-03-10 | 2024-06-25 | 大连德昌线缆有限公司 | Rated current-carrying capacity testing machine for cable |
| CN112964311A (en) * | 2021-04-19 | 2021-06-15 | 天津福尔欣汽车线缆有限公司 | Test device for testing current-carrying capacity of automobile cable and maximum conductor temperature rise during overload |
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Address after: 264000 No. 11 middle Wolong Road, Wolong Industrial Park, Yantai, Shandong Applicant after: YANTAI JINRUN NUCLEAR POWER MATERIAL CO., LTD. Address before: 264000 No. 11 middle Wolong Road, Zhifu District, Shandong, Yantai Applicant before: YANTAI JINRUN FIRE ENGINEERING CO., LTD. |
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