CN105044544A - Detection method prior to cutting off of large cross-section high voltage cable - Google Patents
Detection method prior to cutting off of large cross-section high voltage cable Download PDFInfo
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- CN105044544A CN105044544A CN201510539885.7A CN201510539885A CN105044544A CN 105044544 A CN105044544 A CN 105044544A CN 201510539885 A CN201510539885 A CN 201510539885A CN 105044544 A CN105044544 A CN 105044544A
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Abstract
The invention relates to a detection method prior to the cutting off of a large cross-section high voltage cable. The detection method includes the following steps: I. establishing a short circuit between the secondary terminals K1 and K2 of a zero sequence current mutual inductor by using an annealed copper wire; opening the connecting pieces of K1' and K2' of the zero sequence current mutual inductor; nesting the zero sequence current mutual inductor in the high voltage cable to be detected, the high voltage cable having a voltage of no less than 10 KV, and tightening the connection pieces of K1' and K2', and securing a hexagon socket screw of the zero sequence current mutual inductor; II. locking atong-type ammeterto the annealed cooper wire of the secondary terminals K1 and K2, and selecting the range based on a value obtained by dividing the possible maximum value of the cable line by the transformation ratio of the zero sequence current mutual inductor; III. multiplying the current value obtained in field by using the tong-type ammeter by the transformation ratio of the open-type zero sequence current mutual inductor adopted, and obtaining the primary current value; IV. conducting the measurement after the power cut of the cable is confirmed, the current being zero. The detection method of the invention is accurate in measurement.
Description
Technical field
The present invention relates to the sawed-off front detection method of a kind of heavy in section high-tension cable.
Background technology
Need the situation of sawed-off high-tension cable more in power industry: to puncture when high-tension cable carries out preventive trial; Run cable generation breakdown fault; High-tension cable needs shifting processing etc. due to construction or transformation etc., all needs sawed-off high-tension cable; Need, to the accurate confirmation wanting sawed-off high-tension cable to carry out 100%, because once saw wrong cable, high-voltage operation line tripping dead electricity to occur, the serious accident of operating personnel's personal injury before sawed-off high-tension cable; And high-tension cable to lay environment special: on-site cable well, cable duct, cable testing bridge etc., and to lay because of many arrangements simultaneously and corner turns round and the cable at the place such as through walls accurately cannot follow line, simultaneously because high-tension cable has good multilayer insulation, therefore also conventional electrical verification cannot be implemented.
Confirmation method before the sawed-off high-tension cable of current employing has: the cable confirmation method before carrying out drill rod and hammering into cable core test, a kind of is that the method for the additional power source signal generators such as capacitive couplings detects, and another kind uses high pressure clamp on amperemeter to carry out the method measured.But the former also exists the interference such as on-the-spot electromagnetism, test is inaccurate, causes the danger of judging by accident; And the latter due to the bore of high pressure clamp on amperemeter less, be only applicable to small-bore cable, cannot implement the electric cable with large cross-section being progressively replaced by present 10KV, 35KV, 110KV.
Summary of the invention
In order to overcome the above-mentioned deficiency of the sawed-off front confirmation detection method of existing heavy in section high-tension cable, the invention provides the sawed-off front measurement of a kind of electric system heavy caliber high pressure cable sawed-off front detection method of heavy in section high-tension cable accurately.
Because design of the present invention is identical, some step of operation is different, is divided into two kinds of methods.
A detection method before heavy in section high-tension cable is sawed-off, it comprises following step successively:
iwith (general usable floor area is 1.5mm
2 or 2.5mm
2 , long is 25-30cm) and secondary terminals K1, K2 of open type zero sequence current mutual inductor carry out short circuit by annealed copper wire;
The brace of K1', K2' of open type zero sequence current mutual inductor is opened; The hexagon socket head cap screw of zero-sequence transformer both sides is unclamped and pulls down, zero sequence current mutual inductor is embedded in and on-the-spot is testedly not less than on the high-tension cable of 10KV, the brace of K1', K2' is tightened, by fastening for the hexagon socket head cap screw of zero sequence current mutual inductor, guarantee opening zero sequence current mutual inductor upper body and zero sequence current mutual inductor lower body section aligned and tight close;
iIthe table card of clamp on amperemeter is stuck on the annealed copper wire of secondary terminals K1, K2 of the zero sequence current mutual inductor of short circuit, select the range of clamp on amperemeter: the selection of range will be selected divided by the numerical value of the no-load voltage ratio gained of zero sequence current mutual inductor by the greatest measure possible according to tested circuit, to be applicable to on-the-spot possible current sample scope;
iIIthe current values that scene clamp on amperemeter is tested is multiplied by the no-load voltage ratio of adopted open type zero sequence current mutual inductor, obtains primary current value;
iVconfirm tested
'scable line is measured after having a power failure again, and electric current reduces to null value;
vthe drill rod carried out before sawed-off cable hammers into cable core link, when drill rod contact cable core current-carrying part, ground connection does not occur or short circuit phenomenon then illustrates that this cable is not charged, sawed-off.
Reliable in order to operate, the detection method before above-mentioned heavy in section high-tension cable is sawed-off, in step
iIIobtain primary current value simultaneously, the data of the reometer in the measurement data of phone contact simultaneously and main website Centralized Monitoring or let-down stations are carried out accounting and are contrasted, and data should be identical:
In step
iVtime, the data of reometer that simultaneously phone is checked in the measurement data of main website Centralized Monitoring or let-down stations also should reduce to null value simultaneously.
In order to more insure, the detection method before above-mentioned heavy in section high-tension cable is sawed-off, in step
iIIthe data consistent of the reometer in measurement data or let-down stations is determined with line by again searching;
In step
iVthe data of the reometer in measurement data or let-down stations also should be reduced to null value simultaneously and be
heavynewly search and determine with line.
In detection method before heavy in section of the present invention high-tension cable is sawed-off, described high-tension cable is any one in 10KV, 35KV, 110KV.
Reliable in order to operate insurance, the present invention proposes the sawed-off front detection method of another kind of heavy in section high-tension cable, and it comprises following step successively:
iwith (general usable floor area is 1.5mm
2 or 2.5mm
2 , long is 25-30cm) and secondary terminals K1, K2 of open type zero sequence current mutual inductor carry out short circuit by annealed copper wire;
The brace of K1', K2' of open type zero sequence current mutual inductor is opened; The hexagon socket head cap screw of zero-sequence transformer both sides is unclamped and pulls down, zero sequence current mutual inductor is embedded in and on-the-spot is testedly not less than on the high-tension cable of 10KV, the brace of K1', K2' is tightened, by fastening for the hexagon socket head cap screw of zero sequence current mutual inductor, guarantee opening zero sequence current mutual inductor upper body and zero sequence current mutual inductor lower body section aligned and tight close;
iIthe table card of clamp on amperemeter being stuck on the annealed copper wire of secondary terminals K1, K2 of the zero sequence current mutual inductor of short circuit, selecting the range of clamp on amperemeter: the selection of range will according to tested
'sthe possible greatest measure of circuit is selected divided by the numerical value of the no-load voltage ratio gained of zero sequence current mutual inductor, to be applicable to on-the-spot possible current sample scope;
iIIthe current values that scene clamp on amperemeter is tested is multiplied by the no-load voltage ratio of adopted open type zero sequence current mutual inductor, obtains primary current value; The data of the reometer in the measurement data of simultaneously phone contact and main website Centralized Monitoring or let-down stations are carried out accounting and contrasts, and data are inconsistent, then explanation institute test cable mistake, is not the cable that we think, needs again to search with line;
The current value easily obscuring cable of same method test next-door neighbour and check confirmation: easily obscure cable carry out above-mentioned steps to adjacent
ito step
iIIprocess, phone contact is carried out accounting with the data of the reometer in the measurement data of main website Centralized Monitoring or let-down stations and is contrasted, data consistent, the cable of mensuration be think wanted cable want sawed-off cable.
iV, confirm that tested cable line is measured after having a power failure again, the data of reometer that phone is checked in the measurement data of main website Centralized Monitoring or let-down stations simultaneously do not reduce to null value, institute's test cable mistake, need again to search with line;
The current value easily obscuring cable of same method test next-door neighbour and check confirmation: easily obscure cable carry out above-mentioned steps to adjacent
ito step
iIprocess, in step
iVtime, confirm tested
'scable line is measured after having a power failure again.The data of reometer that phone is checked in the measurement data of main website Centralized Monitoring or let-down stations again reduce to null value.
vthe drill rod carried out before sawed-off cable hammers into cable core link, when drill rod contact cable core current-carrying part, ground connection does not occur or short circuit phenomenon then illustrates that this cable is not charged, sawed-off.
In detection method before above-mentioned heavy in section high-tension cable is sawed-off, described high-tension cable is any one in 10KV, 35KV, 110KV.
It should be noted that, the detection method before heavy in section of the present invention high-tension cable is sawed-off, not only for the high-tension cable of 10KV, 35KV, 110KV, and can be used for the high-tension cable of 6KV or lower.
Beneficial effect of the present invention
Ensure that the life security of sawing cable operating personnel, guarantee the stable operation of normal working line, neither by the impact of electromagnetic field scene interference, the drawback that high pressure clamp on amperemeter bore is little can be solved again, solve the difficult problems perplexing power industry for many years, measure accurately and reliably.Heavy caliber cable mostly is significant load and the 110KV load of 10KV, 35KV, avoids once occur to judge sawed-off cable by accident to cause the huge fluctuation of large area dead electricity and system, has influence on the fluctuation of electrical network and city's net, province's net.
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with embodiment, following embodiment is the process in order to understand embodiment, but the specific embodiment of the present invention is not limited to following embodiment, and following embodiment is not limitation of the present invention.
embodiment one
The present embodiment is the open type high pressure zero sequence current mutual inductor with model ER-LH120, and no-load voltage ratio is 50/1, and window bore is 120mm, measures the electric current of the electric cable with large cross-section of 110KV.
The present embodiment is following step successively:
iwith the 1.5mm being about 20cm
2 annealed copper wire secondary terminals K1, K2 of open type zero sequence current mutual inductor are carried out short circuit; Open with the brace of cross screwdriver by K1', K2' of open type zero sequence current mutual inductor: open by zero-sequence transformer upper body and zero-sequence transformer lower body two parts; Use interior six square set cartridge type spanners to be unclamped by the hexagon socket head cap screw of zero-sequence transformer both sides to pull down, zero sequence current mutual inductor is embedded on on-the-spot tested 110KV high-tension cable, the brace of K1', K2' is tightened, use interior six square set cartridge type spanners by fastening for the hexagon socket head cap screw bar of zero sequence current mutual inductor, guarantee opening zero sequence current mutual inductor upper body and zero sequence current mutual inductor lower body section aligned and tight close.
iI, the table card of clamp on amperemeter is stuck on the annealed copper wire of secondary terminals K1, K2 of the zero sequence current mutual inductor of short circuit, select the range of clamp on amperemeter: the selection of range will be selected divided by the numerical value of the no-load voltage ratio gained of zero sequence current mutual inductor according to the greatest measure that tested 110KV circuit is possible, the present embodiment selects 10A range, to be applicable to on-the-spot possible current sample scope.
iII, the current values 1.42A that scene clamp on amperemeter is tested is multiplied by the no-load voltage ratio of adopted open type zero sequence current mutual inductor
50/1, obtain primary current value 71A;
iV, confirm tested 110KV cable line have a power failure after measure again, electric current reduces to null value.
v, carry out sawed-off cable before drill rod hammer into cable core link, when drill rod contact cable core current-carrying part as there is not ground connection or short circuit phenomenon then illustrates that this cable is not charged, can be sawed-off.
embodiment two
The difference of the present embodiment and embodiment one is:
In step
iIIobtain primary current value simultaneously, the data of the reometer in the measurement data of phone contact simultaneously and main website Centralized Monitoring or let-down stations are carried out accounting and are contrasted, and data are identical:
In step
iVtime, the data of reometer that simultaneously phone is checked in the measurement data of main website Centralized Monitoring or let-down stations also reduce to null value simultaneously.
Other operation is identical with enforcement one.
embodiment three
The present embodiment is following step successively:
iwith the 2.5mm being about 25cm
2 annealed copper wire secondary terminals K1, K2 of open type zero sequence current mutual inductor are carried out short circuit; Open with the brace of cross screwdriver by K1', K2' of open type zero sequence current mutual inductor: open by zero-sequence transformer upper body and zero-sequence transformer lower body two parts; Use interior six square set cartridge type spanners to be unclamped by the hexagon socket head cap screw of zero-sequence transformer both sides to pull down, zero sequence current mutual inductor is embedded on on-the-spot tested 110KV high-tension cable, the brace of K1', K2' is tightened, use interior six square set cartridge type spanners by fastening for the hexagon socket head cap screw bar of zero sequence current mutual inductor, guarantee opening zero sequence current mutual inductor upper body and zero sequence current mutual inductor lower body section aligned and tight close.
iI, the table card of clamp on amperemeter is stuck on the annealed copper wire of secondary terminals K1, K2 of the zero sequence current mutual inductor of short circuit, select the range of clamp on amperemeter: the selection of range will be selected divided by the numerical value of the no-load voltage ratio gained of zero sequence current mutual inductor according to the greatest measure that tested 110KV circuit is possible, the present embodiment selects 10A range, to be applicable to on-the-spot possible current sample scope.
iII, the current values 1.42A that scene clamp on amperemeter is tested is multiplied by the no-load voltage ratio of adopted open type zero sequence current mutual inductor
50/1, obtain primary current value 71A;
iV, confirm tested 110KV cable line have a power failure after measure again, electric current reduces to null value.
Also carry out following operation simultaneously:
In step
iIIthe data consistent of the reometer in measurement data or let-down stations is determined with line by again searching; Namely above-mentioned step
iextremely
iVafter, repeat above-mentioned steps again
iextremely
iVprocess determine;
In step
iVthe data of the reometer in measurement data or let-down stations also should be reduced to null value simultaneously and be
heavynewly search and determine with line; Namely above-mentioned step
iextremely
iVafter, repeat again above-mentioned step
iextremely
iVprocess determine.
vthe drill rod carried out before sawed-off cable hammers into cable core link, when drill rod contact cable core current-carrying part as there is not ground connection or short circuit phenomenon then illustrates that this cable is not charged, and can be sawed-off.
embodiment four
The present embodiment is following step successively:
iwith the 2.5mm being about 25cm
2 annealed copper wire secondary terminals K1, K2 of open type zero sequence current mutual inductor are carried out short circuit; Open with the brace of cross screwdriver by K1', K2' of open type zero sequence current mutual inductor: open by zero-sequence transformer upper body and zero-sequence transformer lower body two parts; Use interior six square set cartridge type spanners to be unclamped by the hexagon socket head cap screw of zero-sequence transformer both sides to pull down, zero sequence current mutual inductor is embedded on on-the-spot tested 110KV high-tension cable, the brace of K1', K2' is tightened, use interior six square set cartridge type spanners by fastening for the hexagon socket head cap screw bar of zero sequence current mutual inductor, guarantee opening zero sequence current mutual inductor upper body and zero sequence current mutual inductor lower body section aligned and tight close.
iI, the table card of clamp on amperemeter is stuck on the annealed copper wire of secondary terminals K1, K2 of the zero sequence current mutual inductor of short circuit, select the range of clamp on amperemeter: the selection of range will be selected divided by the numerical value of the no-load voltage ratio gained of zero sequence current mutual inductor according to the greatest measure that tested 110KV circuit is possible, the present embodiment selects 10A range, to be applicable to on-the-spot possible current sample scope.
iII, the current values 1.42A that scene clamp on amperemeter is tested is multiplied by the no-load voltage ratio of adopted open type zero sequence current mutual inductor
50/1, obtain primary current value 71A;
The data of the reometer in the measurement data of simultaneously phone contact and main website Centralized Monitoring or let-down stations are carried out accounting and contrasts, and data are inconsistent, then explanation institute test cable mistake, is not the cable that we think, needs again to search with line;
The current value easily obscuring cable of same method test next-door neighbour and check confirmation: easily obscure cable carry out above-mentioned steps to adjacent
ito step
iIIprocess, phone contact is carried out with the data of the reometer in the measurement data of main website Centralized Monitoring or let-down stations accounting and contrast, data consistent, specifically the cable of mensuration be think wanted cable want sawed-off cable.
iV, confirm tested 110KV cable line have a power failure after measure again.The data of reometer that simultaneously phone is checked in the measurement data of main website Centralized Monitoring or let-down stations do not reduce to null value, institute's test cable mistake is described, is not the cable that we think, needs again to search with line;
The current value easily obscuring cable of same method test next-door neighbour and check confirmation: easily obscure cable carry out above-mentioned steps to adjacent
ito step
iIprocess, in step
iVtime, confirm that tested 110KV cable line is measured after having a power failure again.The data of reometer that phone is checked in the measurement data of main website Centralized Monitoring or let-down stations again reduce to null value, and wanted sawed-off cable thought by the current cable measured.
v, carry out sawed-off cable before drill rod hammer into cable core link, when drill rod contact cable core current-carrying part as there is not ground connection or short circuit phenomenon then illustrates that this cable is not charged, can be sawed-off.
Present invention, avoiding and hammer into cable core generation ground connection or short circuit with carrying out drill rod after wrong cable, and the harm of the human life's safety caused and alive circuit tripping operation dead electricity and large area fluctuation.
The insulating material of the present embodiment open type high-tension current inductor adopts rubber plastics-insulated material, is applicable to the use of high-tension cable ditch and cable basement, cable testing bridge environment.
Illustrate: K1', K2' are two Open attachment end of open type zero-sequence transformer.Have brace between K1', K2', the upper body of open type zero sequence current mutual inductor is connected fastening by K1', K2' and brace with lower body, opened by the brace between K1', K2' when needing to open.
Claims (6)
1. the sawed-off front detection method of heavy in section high-tension cable, it comprises following step successively:
iwith annealed copper wire, secondary terminals K1, K2 of open type zero sequence current mutual inductor are carried out short circuit;
The brace of K1', K2' of open type zero sequence current mutual inductor is opened; The hexagon socket head cap screw of zero-sequence transformer both sides is unclamped and pulls down, zero sequence current mutual inductor is embedded in and on-the-spot is testedly not less than on the high-tension cable of 10KV, the brace of K1', K2' is tightened, by fastening for the hexagon socket head cap screw of zero sequence current mutual inductor, guarantee opening zero sequence current mutual inductor upper body and zero sequence current mutual inductor lower body section aligned and tight close;
iIthe table card of clamp on amperemeter is stuck on the annealed copper wire of secondary terminals K1, K2 of the zero sequence current mutual inductor of short circuit, select the range of clamp on amperemeter: the selection of range will be selected divided by the numerical value of the no-load voltage ratio gained of zero sequence current mutual inductor by the greatest measure possible according to tested circuit, to be applicable to on-the-spot possible current sample scope;
iIIthe current values that scene clamp on amperemeter is tested is multiplied by the no-load voltage ratio of adopted open type zero sequence current mutual inductor, obtains primary current value;
iVconfirm tested
'scable line is measured after having a power failure again, and electric current reduces to null value.
2. the sawed-off front detection method of heavy in section according to claim 1 high-tension cable, is characterized in that: in step
iIIobtain primary current value simultaneously, the data of the reometer in the measurement data of phone contact simultaneously and main website Centralized Monitoring or let-down stations are carried out accounting and are contrasted, and data should be identical:
In step
iVtime, the data of reometer that simultaneously phone is checked in the measurement data of main website Centralized Monitoring or let-down stations also should reduce to null value simultaneously.
3. the sawed-off front detection method of heavy in section according to claim 2 high-tension cable, is characterized in that: in step
iIIthe data consistent of the reometer in measurement data or let-down stations is determined with line by again searching;
In step
iVthe data of the reometer in measurement data or let-down stations also should be reduced to null value simultaneously and be
heavynewly search and determine with line.
4., according to the sawed-off front detection method of described heavy in section high-tension cable arbitrary in claim 1 or 2 or 3, it is characterized in that: described high-tension cable is any one in 10KV, 35KV, 110KV.
5. the sawed-off front detection method of heavy in section high-tension cable, it comprises following step successively:
iwith annealed copper wire, secondary terminals K1, K2 of open type zero sequence current mutual inductor are carried out short circuit;
The brace of K1', K2' of open type zero sequence current mutual inductor is opened; The hexagon socket head cap screw of zero-sequence transformer both sides is unclamped and pulls down, zero sequence current mutual inductor is embedded in and on-the-spot is testedly not less than on the high-tension cable of 10KV, the brace of K1', K2' is tightened, by fastening for the hexagon socket head cap screw of zero sequence current mutual inductor, guarantee opening zero sequence current mutual inductor upper body and zero sequence current mutual inductor lower body section aligned and tight close;
iIthe table card of clamp on amperemeter being stuck on the annealed copper wire of secondary terminals K1, K2 of the zero sequence current mutual inductor of short circuit, selecting the range of clamp on amperemeter: the selection of range will according to tested
'sthe possible greatest measure of circuit is selected divided by the numerical value of the no-load voltage ratio gained of zero sequence current mutual inductor, to be applicable to on-the-spot possible current sample scope;
iIIthe current values that scene clamp on amperemeter is tested is multiplied by the no-load voltage ratio of adopted open type zero sequence current mutual inductor, obtains primary current value; The data of the reometer in the measurement data of simultaneously phone contact and main website Centralized Monitoring or let-down stations are carried out accounting and contrasts, and data are inconsistent, then explanation institute test cable mistake, is not the cable that we think, needs again to search with line;
The current value easily obscuring cable of same method test next-door neighbour and check confirmation: easily obscure cable carry out above-mentioned steps to adjacent
ito step
iIIprocess, phone contact is carried out accounting with the data of the reometer in the measurement data of main website Centralized Monitoring or let-down stations and is contrasted, data consistent, the cable of mensuration be think wanted cable want sawed-off cable;
iV, confirm that tested cable line is measured after having a power failure again, the data of reometer that phone is checked in the measurement data of main website Centralized Monitoring or let-down stations simultaneously do not reduce to null value, institute's test cable mistake, need again to search with line;
The current value easily obscuring cable of same method test next-door neighbour and check confirmation: easily obscure cable carry out above-mentioned steps to adjacent
ito step
iIprocess, in step
iVtime, confirm tested
'scable line is measured after having a power failure again; The data of reometer that phone is checked in the measurement data of main website Centralized Monitoring or let-down stations again reduce to null value.
6. the sawed-off front detection method of heavy in section according to claim 5 high-tension cable, is characterized in that: described high-tension cable is any one in 10KV, 35KV, 110KV.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN105044544B CN105044544B (en) | 2017-12-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109103841A (en) * | 2018-10-30 | 2018-12-28 | 攀钢集团西昌钢钒有限公司 | A kind of electric system of supply transformer |
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| CN105044544B (en) | 2017-12-26 |
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