CN105044544B - Detection method before heavy in section high-tension cable is sawed-off - Google Patents
Detection method before heavy in section high-tension cable is sawed-off Download PDFInfo
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- CN105044544B CN105044544B CN201510539885.7A CN201510539885A CN105044544B CN 105044544 B CN105044544 B CN 105044544B CN 201510539885 A CN201510539885 A CN 201510539885A CN 105044544 B CN105044544 B CN 105044544B
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Abstract
The present invention relates to a kind of detection method of heavy in section high-tension cable before sawed-off, it comprises the steps：Ith, with annealed copper wire by secondary terminals K1, K2 short circuit of zero sequence current mutual inductor；K1', K2' of zero sequence current mutual inductor connection sheet are opened；Zero sequence current mutual inductor is embedded on the tested high-tension cable not less than 10KV, K1', K2' connection sheet are tightened, the hexagon socket head cap screw of zero sequence current mutual inductor is fastened；IIth, clamp on amperemeter is stuck on secondary terminals K1, K2 annealed copper wire：Selection range is carried out according to the numerical value obtained by the possible greatest measure of circuit divided by the no-load voltage ratio of zero sequence current mutual inductor tested；IIIth, the no-load voltage ratio of open type zero sequence current mutual inductor, obtains primary current value used by the current values that scene is tested with clamp on amperemeter are multiplied by；IVth, confirm that tested cable run measures again after having a power failure, electric current is reduced to null value.Detection method measurement before this heavy in section high-tension cable is sawed-off is accurate.
Description
Technical field
The present invention relates to a kind of detection method of heavy in section high-tension cable before sawed-off.
Background technology
Need the situation of sawed-off high-tension cable more in power industry：High-tension cable hit during preventive trial
Wear；Run cable and breakdown fault occurs；High-tension cable needs shifting processing etc. due to constructing or transforming etc., is required for sawed-off high-tension electricity
Cable；The accurate confirmation to wanting sawed-off high-tension cable to carry out 100% is needed before sawed-off high-tension cable, because if wrong cable is sawed
Generation high-voltage operation line tripping dead electricity, the serious accident of operating personnel's personal injury；And high-tension cable laying environment is special：It is existing
Cable shaft, cable duct, cable testing bridge etc., and because a plurality of while arrange laying and corner turns round and cable through walls etc.
Simultaneously because high-tension cable has good multilayer insulation, therefore it can not can not also implement conventional electrical verification accurately with line.
Confirmation method before the sawed-off high-tension cable used at present has：Cable before carrying out drill rod and hammering into cable core experiment
Confirmation method, a kind of is that the method for the additional power source signal generator such as capacitive couplings is detected, and another kind is to use high pressure
The method that clamp on amperemeter measures.But, there is the interference such as live electromagnetism, test is inaccurate, causes the danger of erroneous judgement for the former；
And the latter is only applicable to small-bore cable because the bore of high pressure clamp on amperemeter is smaller, to be progressively replaced by present 10KV,
35KV, 110KV electric cable with large cross-section can not be implemented.
The content of the invention
In order to overcome the above-mentioned deficiency of the sawed-off preceding confirmation detection method of existing heavy in section high-tension cable, the present invention provides a kind of
The sawed-off preceding detection method of the accurate heavy in section high-tension cable of measurement before power system heavy caliber high pressure cable is sawed-off.
Because the design of the present invention is identical, some steps of operation are different, are divided into two methods.
A kind of heavy in section high-tension cable it is sawed-off before detection method, it include it is following successively the step of：
I uses（General usable floor area is 1.5mm2Or 2.5mm2, a length of 25-30cm）Annealed copper wire is mutual by open type zero-sequence current
Secondary terminals K1, K2 of sensor carry out short circuit；
K1', K2' of open type zero sequence current mutual inductor connection sheet are opened；By the interior hexagonal of ZCT both sides
Bolt, which unclamps, to be pulled down, and zero sequence current mutual inductor is nested and is tested at the scene on the high-tension cable not less than 10KV, by K1', K2'
Connection sheet is tightened, and the hexagon socket head cap screw of zero sequence current mutual inductor is fastened, it is ensured that opening zero sequence current mutual inductor upper body and zero sequence
Current transformer lower body section aligned and tight close；
II is stuck in the table card of clamp on amperemeter secondary terminals K1, K2 of the zero sequence current mutual inductor of short circuit soft copper
On line, the range of clamp on amperemeter is selected：The selection of range will be according to the possible greatest measure of circuit divided by zero sequence tested
Numerical value obtained by the no-load voltage ratio of current transformer is selected, with suitable for the possible current sample scope in scene；
The current values that scene is tested with clamp on amperemeter are multiplied by used open type zero sequence current mutual inductor by III
No-load voltage ratio, obtain primary current value；
IV confirms that tested cable run measures again after having a power failure, and electric current is reduced to null value；
Drill rod before the V sawed-off cable of progress hammers into cable core link, when drill rod contacts cable core current-carrying part, does not send out
Raw ground connection or short circuit phenomenon then illustrate that the cable is not powered, sawed-off.
It is reliable in order to operate, the detection method before above-mentioned heavy in section high-tension cable is sawed-off, obtained once in step III electric
Flow valuve simultaneously, while adjusted by phone contact and the data of the ammeter in the measurement data or let-down stations of main website Centralized Monitoring
Contrast, data should be identical：
In step IV, while the data of the ammeter in the measurement data or let-down stations of phone verification main website Centralized Monitoring
Also null value should be reduced to simultaneously.
In order to more insure, the detection method before above-mentioned heavy in section high-tension cable is sawed-off, in step III measurement data or drop
The data of ammeter in pressure station are unanimously determined by searching again with line；
The data of ammeter in step IV measurement data or let-down stations also should be reduced to null value simultaneouslyWeightIt is new search with
Line and determine.
The present invention heavy in section high-tension cable it is sawed-off before detection method in, described high-tension cable be 10KV, 35KV,
Any of 110KV.
In order to operate insurance reliably, the present invention proposes the sawed-off preceding detection method of another heavy in section high-tension cable, and it is wrapped
Include it is following successively the step of：
I uses（General usable floor area is 1.5mm2Or 2.5mm2, a length of 25-30cm）Annealed copper wire is mutual by open type zero-sequence current
Secondary terminals K1, K2 of sensor carry out short circuit；
K1', K2' of open type zero sequence current mutual inductor connection sheet are opened；By the interior hexagonal of ZCT both sides
Bolt, which unclamps, to be pulled down, and zero sequence current mutual inductor is nested and is tested at the scene on the high-tension cable not less than 10KV, by K1', K2'
Connection sheet is tightened, and the hexagon socket head cap screw of zero sequence current mutual inductor is fastened, it is ensured that opening zero sequence current mutual inductor upper body and zero sequence
Current transformer lower body section aligned and tight close；
II is stuck in the table card of clamp on amperemeter secondary terminals K1, K2 of the zero sequence current mutual inductor of short circuit soft copper
On line, the range of clamp on amperemeter is selected：The selection of range will be according to the possible greatest measure of circuit divided by zero sequence tested
Numerical value obtained by the no-load voltage ratio of current transformer is selected, with suitable for the possible current sample scope in scene；
The current values that scene is tested with clamp on amperemeter are multiplied by used open type zero sequence current mutual inductor by III
No-load voltage ratio, obtain primary current value；Phone contact and the ammeter in the measurement data or let-down stations of main website Centralized Monitoring simultaneously
Data carry out accounting contrast, and data are inconsistent, then illustrate institute's test cable mistake, not it is considered that cable, it is necessary to again
Search with line；
Same method test close to easily obscure cable current value and its verification confirm：Easily obscure cable progress to adjacent
Above-mentioned steps I to step III process, ammeter in the measurement data or let-down stations of phone contact and main website Centralized Monitoring
Data carry out accounting contrast, and data are consistent, and the cable of measure is to think that wanted cable wants sawed-off cable.
IVth, confirm that tested cable run measures again after having a power failure, while the measurement of phone verification main website Centralized Monitoring
The data of ammeter in data or let-down stations are not reduced to null value, and institute's test cable mistake, it is necessary to search with line again；
Same method test close to easily obscure cable current value and its verification confirm：Easily obscure cable progress to adjacent
Above-mentioned steps I, in step IV, confirm that tested cable run measures again after having a power failure to the process of step II.It is electric again
The data of ammeter in the measurement data or let-down stations of words verification main website Centralized Monitoring are reduced to null value.
Drill rod before the V sawed-off cable of progress hammers into cable core link, when drill rod contacts cable core current-carrying part, does not send out
Raw ground connection or short circuit phenomenon then illustrate that the cable is not powered, sawed-off.
Above-mentioned heavy in section high-tension cable it is sawed-off before detection method in, described high-tension cable be 10KV, 35KV,
Any of 110KV.
It should be noted that the present invention heavy in section high-tension cable it is sawed-off before detection method, be applied not only to 10KV,
35KV, 110KV high-tension cable, and can be used for 6KV or lower high-tension cable.
Beneficial effects of the present invention
It ensure that the life security of sawing cable operating personnel, it is ensured that the stable operation of normal operation circuit, neither by electromagnetism
The influence of field scene interference, also solves the problem that the drawbacks of high pressure clamp on amperemeter bore is small, solves to perplex power industry for many years
Difficult problems, measurement is accurately and reliably.Heavy caliber cable is mostly 10KV, 35KV significant load and 110KV loads, avoids once sending out
The raw huge fluctuation judged sawed-off cable by accident and cause large area dead electricity and system, have influence on power network and city's net, the fluctuation of province's net.
Embodiment
Describe the embodiment of the present invention in detail with reference to embodiment, following embodiments are to understand specific reality
The process of mode is applied, but the embodiment of the present invention is not limited to following embodiments, and following embodiments is not to this
The limitation of invention.
Embodiment one
The present embodiment is the open type high pressure zero sequence current mutual inductor with model ER-LH120, no-load voltage ratio 50/1, window mouth
Footpath is 120mm, measures the electric current of 110KV electric cable with large cross-section.
The present embodiment for it is following successively the step of：
I uses 1.5 mm for being about 20cm2Annealed copper wire secondary terminals K1, K2 of open type zero sequence current mutual inductor are entered
Row short circuit；K1', K2' of open type zero sequence current mutual inductor connection sheet are opened with cross screwdriver：I.e. by ZCT
Body is opened with ZCT lower body two parts；Using interior six square sets cartridge type spanner by the hexagon socket head cap screw of ZCT both sides
Release is pulled down, and zero sequence current mutual inductor is nested and is tested at the scene on 110KV high-tension cables, K1', K2' connection sheet are tightened,
The hexagon socket head cap screw bar of zero sequence current mutual inductor is fastened using interior six square sets cartridge type spanner, it is ensured that opening zero sequence current mutual inductor
Upper body and zero sequence current mutual inductor lower body section aligned and tight close.
The IIth, the table card of clamp on amperemeter is stuck in secondary terminals K1, K2 of the zero sequence current mutual inductor of short circuit soft copper
On line, the range of clamp on amperemeter is selected：The selection of range will be according to the possible greatest measure division by 0 of tested 110KV circuits
Numerical value obtained by the no-load voltage ratio of sequence current transformer is selected, the present embodiment selection 10A ranges, with suitable for the possible electricity in scene
Flow sample range.
IIIth, open type zero-sequence current is mutual used by the current values 1.42A that scene is tested with clamp on amperemeter is multiplied by
The no-load voltage ratio 50/1 of sensor, obtain primary current value 71A；
IVth, confirm that tested 110KV cable runs measure again after having a power failure, electric current is reduced to null value.
Vth, carry out the drill rod before sawed-off cable and hammer into cable core link, when drill rod contacts cable core current-carrying part as not
Generation is grounded or short circuit phenomenon then illustrates that the cable is not powered, can be sawed-off.
Embodiment two
The present embodiment is a difference in that with embodiment one：
Primary current value is obtained in step III simultaneously, while measurement data or decompression of the phone contact with main website Centralized Monitoring
The data of ammeter in standing carry out accounting contrast, and data are identical：
In step IV, while the data of the ammeter in the measurement data or let-down stations of phone verification main website Centralized Monitoring
Also it is reduced to null value simultaneously.
Other operations are identical with implementation one.
Embodiment three
The present embodiment for it is following successively the step of：
I uses the 2.5mm for being about 25cm2Annealed copper wire secondary terminals K1, K2 of open type zero sequence current mutual inductor are carried out
Short circuit；K1', K2' of open type zero sequence current mutual inductor connection sheet are opened with cross screwdriver：I.e. by ZCT upper body
Opened with ZCT lower body two parts；It is using interior six square sets cartridge type spanner that the hexagon socket head cap screw of ZCT both sides is loose
Open down, zero sequence current mutual inductor is nested and is tested at the scene on 110KV high-tension cables, K1', K2' connection sheet are tightened, made
The hexagon socket head cap screw bar of zero sequence current mutual inductor is fastened with interior six square sets cartridge type spanner, it is ensured that on opening zero sequence current mutual inductor
Body and zero sequence current mutual inductor lower body section aligned and tight close.
The IIth, the table card of clamp on amperemeter is stuck in secondary terminals K1, K2 of the zero sequence current mutual inductor of short circuit soft copper
On line, the range of clamp on amperemeter is selected：The selection of range will be according to the possible greatest measure division by 0 of tested 110KV circuits
Numerical value obtained by the no-load voltage ratio of sequence current transformer is selected, the present embodiment selection 10A ranges, with suitable for the possible electricity in scene
Flow sample range.
IIIth, open type zero-sequence current is mutual used by the current values 1.42A that scene is tested with clamp on amperemeter is multiplied by
The no-load voltage ratio 50/1 of sensor, obtain primary current value 71A；
IVth, confirm that tested 110KV cable runs measure again after having a power failure, electric current is reduced to null value.
Also carry out following operations simultaneously：
The data of ammeter in step III measurement data or let-down stations are determined by searching again with line
's；I.e. above-mentioned step I to after IV, repeat the above steps again I to IV process and determine；
The data of ammeter in step IV measurement data or let-down stations also should be reduced to null value simultaneouslyWeightIt is new search with
Line and determine；I.e. above-mentioned step I repeats above-mentioned step I and determined to IV process again to after IV.
Drill rod before the V sawed-off cable of progress hammers into cable core link, when drill rod contacts cable core current-carrying part as not
Generation is grounded or short circuit phenomenon then illustrates that the cable is not powered, can be sawed-off.
Example IV
The present embodiment for it is following successively the step of：
I uses the 2.5mm for being about 25cm2Annealed copper wire secondary terminals K1, K2 of open type zero sequence current mutual inductor are carried out
Short circuit；K1', K2' of open type zero sequence current mutual inductor connection sheet are opened with cross screwdriver：I.e. by ZCT upper body
Opened with ZCT lower body two parts；It is using interior six square sets cartridge type spanner that the hexagon socket head cap screw of ZCT both sides is loose
Open down, zero sequence current mutual inductor is nested and is tested at the scene on 110KV high-tension cables, K1', K2' connection sheet are tightened, made
The hexagon socket head cap screw bar of zero sequence current mutual inductor is fastened with interior six square sets cartridge type spanner, it is ensured that on opening zero sequence current mutual inductor
Body and zero sequence current mutual inductor lower body section aligned and tight close.
The IIth, the table card of clamp on amperemeter is stuck in secondary terminals K1, K2 of the zero sequence current mutual inductor of short circuit soft copper
On line, the range of clamp on amperemeter is selected：The selection of range will be according to the possible greatest measure division by 0 of tested 110KV circuits
Numerical value obtained by the no-load voltage ratio of sequence current transformer is selected, the present embodiment selection 10A ranges, with suitable for the possible electricity in scene
Flow sample range.
IIIth, open type zero-sequence current is mutual used by the current values 1.42A that scene is tested with clamp on amperemeter is multiplied by
The no-load voltage ratio 50/1 of sensor, obtain primary current value 71A；
Phone contact and the data of the ammeter in the measurement data or let-down stations of main website Centralized Monitoring are adjusted simultaneously
Contrast, data are inconsistent, then illustrate institute's test cable mistake, not it is considered that cable, it is necessary to search again with line；
Same method test close to easily obscure cable current value and its verification confirm：Easily obscure cable progress to adjacent
Above-mentioned steps I to step III process, ammeter in the measurement data or let-down stations of phone contact and main website Centralized Monitoring
Data carry out accounting contrast, and data are consistent, and the cable specifically determined is to think that wanted cable wants sawed-off cable.
IVth, confirm that tested 110KV cable runs measure again after having a power failure.The survey of the main website of phone verification simultaneously Centralized Monitoring
Amount data or the data of the ammeter in let-down stations are not reduced to null value, illustrates institute's test cable mistake, be not it is considered that electricity
Cable, it is necessary to search with line again；
Same method test close to easily obscure cable current value and its verification confirm：Easily obscure cable progress to adjacent
Above-mentioned steps I, in step IV, confirm that tested 110KV cable runs measure again after having a power failure to the process of step II.Again
The data of ammeter in the measurement data or let-down stations of phone verification main website Centralized Monitoring are reduced to null value, the cable specifically determined
It is to think wanted sawed-off cable.
Vth, carry out the drill rod before sawed-off cable and hammer into cable core link, when drill rod contacts cable core current-carrying part as not
Generation is grounded or short circuit phenomenon then illustrates that the cable is not powered, can be sawed-off.
Present invention, avoiding with after wrong cable carry out drill rod hammer into cable core occur ground connection or short circuit, and caused by personnel give birth to
Order safety and the harm of alive circuit tripping operation dead electricity and large area fluctuation.
The insulating materials of the present embodiment open type high-tension current inductor uses rubber plastics-insulated material, suitable for high-tension cable
Ditch and cable basement, the use of cable testing bridge environment.
Explanation：K1', K2' are two Open attachment ends of open type ZCT.There is connection sheet between K1', K2',
The upper body of open type zero sequence current mutual inductor is connected fastening, it is necessary to by K1', K2' when opening by K1', K2' and connection sheet with lower body
Between connection sheet open.
Claims (6)
1. a kind of heavy in section high-tension cable it is sawed-off before detection method, it include it is following successively the step of：
Secondary terminals K1, K2 of open type zero sequence current mutual inductor are carried out short circuit by I with annealed copper wire；
K1', K2' of open type zero sequence current mutual inductor connection sheet are opened；By open type zero sequence current mutual inductor both sides
Hexagon socket head cap screw, which unclamps, to be pulled down, and open type zero sequence current mutual inductor is nested the high-tension cable being tested at the scene not less than 10KV
On, K1', K2' connection sheet are tightened, the hexagon socket head cap screw of open type zero sequence current mutual inductor fastened, it is ensured that open type zero
Sequence current transformer upper body and open type zero sequence current mutual inductor lower body section aligned and tight close；
II is stuck in the table card of clamp on amperemeter the soft of secondary terminals K1, K2 of the open type zero sequence current mutual inductor of short circuit
On copper cash, the range of clamp on amperemeter is selected：The selection of range according to the possible greatest measure of circuit tested divided by will open
Numerical value obtained by the no-load voltage ratio of mouth formula zero sequence current mutual inductor is selected, with suitable for the possible current sample scope in scene；
III is multiplied by the current values that scene is tested with clamp on amperemeter the change of used open type zero sequence current mutual inductor
Than obtaining primary current value；
IV confirms that tested cable run measures again after having a power failure, and electric current is reduced to null value.
The detection method before 2. heavy in section high-tension cable according to claim 1 is sawed-off, it is characterized in that：Obtained in step III
To primary current value simultaneously, the data of the ammeter while in the measurement data or let-down stations of phone contact and main website Centralized Monitoring
Accounting contrast is carried out, data should be identical;
In step IV, while the data of the ammeter in the measurement data or let-down stations of phone verification main website Centralized Monitoring also should
It is reduced to null value simultaneously.
The detection method before 3. heavy in section high-tension cable according to claim 2 is sawed-off, it is characterized in that：Measured in step III
The data of ammeter in data or let-down stations are unanimously determined by searching again with line；
The data of ammeter in step IV measurement data or let-down stations should also be reduced to simultaneously null value be search again with line and
Determine.
4. according to detection method of any described heavy in section high-tension cable in claim 1 or 2 or 3 before sawed-off, it is characterized in that：
Described high-tension cable is any of 10KV, 35KV, 110KV.
5. a kind of heavy in section high-tension cable it is sawed-off before detection method, it include it is following successively the step of：
Secondary terminals K1, K2 of open type zero sequence current mutual inductor are carried out short circuit by I with annealed copper wire；
K1', K2' of open type zero sequence current mutual inductor connection sheet are opened；By open type zero sequence current mutual inductor both sides
Hexagon socket head cap screw, which unclamps, to be pulled down, and open type zero sequence current mutual inductor is nested the high-tension cable being tested at the scene not less than 10KV
On, K1', K2' connection sheet are tightened, the hexagon socket head cap screw of open type zero sequence current mutual inductor fastened, it is ensured that open type zero
Sequence current transformer upper body and open type zero sequence current mutual inductor lower body section aligned and tight close；
II is stuck in the table card of clamp on amperemeter the soft of secondary terminals K1, K2 of the open type zero sequence current mutual inductor of short circuit
On copper cash, the range of clamp on amperemeter is selected：The selection of range according to the possible greatest measure of circuit tested divided by will open
Numerical value obtained by the no-load voltage ratio of mouth formula zero sequence current mutual inductor is selected, with suitable for the possible current sample scope in scene；
III is multiplied by the current values that scene is tested with clamp on amperemeter the change of used open type zero sequence current mutual inductor
Than obtaining primary current value；Phone contact and the number of the ammeter in the measurement data or let-down stations of main website Centralized Monitoring simultaneously
According to accounting contrast is carried out, data are inconsistent, then illustrate institute's test cable mistake, not it is considered that cable, it is necessary to look into again
Look for line；
Same method test close to easily obscure cable current value and its verification confirm：To it is adjacent easily obscure cable carry out it is above-mentioned
Step I is to the process of step III, the data of the ammeter in the measurement data or let-down stations of phone contact and main website Centralized Monitoring
Accounting contrast is carried out, data are consistent, and the cable of measure is to think wanted sawed-off cable；
IVth, confirm that tested cable run measures again after having a power failure, while the measurement data of phone verification main website Centralized Monitoring
Or the data of the ammeter in let-down stations are not reduced to null value, institute's test cable mistake, it is necessary to search with line again；
Same method test close to easily obscure cable current value and its verification confirm：To it is adjacent easily obscure cable carry out it is above-mentioned
Step I, in step IV, confirms that tested cable run measures again after having a power failure to the process of step II；Phone core again
Null value is reduced to the data of the ammeter in the measurement data or let-down stations of main website Centralized Monitoring.
The detection method before 6. heavy in section high-tension cable according to claim 5 is sawed-off, it is characterized in that：Described high-tension electricity
Cable is any of 10KV, 35KV, 110KV.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510539885.7A CN105044544B (en) | 2015-08-28 | 2015-08-28 | Detection method before heavy in section high-tension cable is sawed-off |
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| CN201510539885.7A CN105044544B (en) | 2015-08-28 | 2015-08-28 | Detection method before heavy in section high-tension cable is sawed-off |
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| CN109103841B (en) * | 2018-10-30 | 2019-08-30 | 攀钢集团西昌钢钒有限公司 | A kind of electric system of supply transformer |
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