CN115173317A - Remote alternating current/direct current cable wiring method - Google Patents
Remote alternating current/direct current cable wiring method Download PDFInfo
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- CN115173317A CN115173317A CN202210906102.4A CN202210906102A CN115173317A CN 115173317 A CN115173317 A CN 115173317A CN 202210906102 A CN202210906102 A CN 202210906102A CN 115173317 A CN115173317 A CN 115173317A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/06—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle
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Abstract
The invention provides a remote alternating current and direct current cable wiring method, which comprises the following steps of 1: four cables are adopted for wiring, wherein a first cable and a second cable are used for hanging loads at intervals, the first cable and the third cable are connected to the positive output wiring side of a power supply, and the fourth cable is connected to the negative output wiring side of the power supply; step 2: the second cable is connected to the first load negative terminal, leads from the first load negative terminal, and forms a positive and negative line interval with the first cable to hook the load until the end of the line; and step 3: the third cable lead is connected to the positive side of the load after reaching the tail end of the line and is connected with the first cable in parallel; and 4, step 4: the negative side of the load is connected to the position from one half to three quarters of the total length of the fourth cable lead to the first cable and is connected with the second cable in parallel; the remote alternating current and direct current cable wiring method provided by the invention is simple in construction, low in cost, simple in implementability and high in reliability, and effectively improves the balance of voltages at two ends of a load.
Description
Technical Field
The invention belongs to the technical field of cable wiring, and particularly relates to a remote alternating current/direct current cable wiring method.
Background
In the remote power supply or communication control, because the equivalent resistance station of the cable has a significant load proportion, the energy consumed by the load due to the transmission of electric energy in the line has to be taken into consideration. The traditional wiring method generally adopts the method of laying a two-core cable wire, laying the cable wire from a power output end to a terminal load in a long distance, and accessing the load at intervals along the cable wire. However, in the case of the application of remote power supply or communication control, the problem is more prominent as the length of the line is longer: the voltage drop of the line is large under the condition of long distance, the difference between the load voltage at the tail end of the line and the load voltage at the output end of the power supply is very large, the voltage of each load in the line is severely unbalanced, and the like. Therefore, the use of the load on the line is seriously influenced, for example, in a power supply occasion, the voltage at the tail end of the line is not enough to maintain the stable operation of equipment, and in a communication control occasion, the consistency of a line control signal is poor, so that the distortion of a control effect is serious. The invention aims to overcome the defects of the traditional wiring and provides a wiring method which is simple in construction, low in cost, simple in implementability and high in reliability. The method can be suitable for the transformation of the traditional wiring mode and is also suitable for the wiring of a new wiring occasion.
Disclosure of Invention
The invention aims to provide a remote alternating current and direct current cable wiring method, and aims to solve the problems of low tail end voltage and unbalanced load voltage in a circuit in remote power supply or communication control.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
the invention provides a remote alternating current and direct current cable wiring method, which comprises the following steps:
step 1: four cables are adopted for wiring, wherein a first cable and a second cable are used for hanging loads at intervals, the first cable and a third cable are connected to the positive output wiring side of a power supply, and the fourth cable is connected to the negative output wiring side of the power supply;
step 2: the second cable is connected to the first load negative terminal, leads from the first load negative terminal, and forms a positive and negative line interval with the first cable to hook the load until the end of the line;
and 3, step 3: the third cable lead is connected to the positive side of the load after reaching the tail end of the line and is connected with the first cable in parallel;
and 4, step 4: the fourth cable lead is connected to the negative side of the load at a position of one half to three quarters of the total length of the first cable and is connected with the second cable in parallel.
As a further development of the invention, the method is used for wiring ac/dc supply lines or for wiring communication control lines.
The invention has the advantages that:
the long-distance alternating current and direct current cable wiring method provided by the invention is simple in construction, low in cost, simple in implementability and high in reliability, and effectively improves the balance of voltages at two ends of a load.
Drawings
FIG. 1 is a schematic wiring diagram of the method of the present invention;
FIG. 2 is a schematic diagram of the equivalent resistance of FIG. 1;
FIG. 3 is a schematic diagram of the delta-junction and star-junction equivalent transformation (Δ -Y transformation) method of the equivalent resistor of FIG. 2;
FIG. 4 is a schematic diagram of the equivalent resistance of FIG. 2 illustrated using a delta-Y variation method;
FIG. 5 is a schematic diagram of equivalent resistance after prior art wiring;
fig. 6 is a schematic voltage drop after wiring using the method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides a remote alternating current and direct current cable wiring method, which comprises the following steps:
step 1: as shown in fig. 1, four cables are wired, wherein a first cable and a second cable are used for hanging a load at intervals, the first cable and the third cable are connected to the positive output wiring side of a power supply, and the fourth cable is connected to the negative output wiring side of the power supply; the total length of the first cable and the third cable is the same;
step 2: the second cable is connected to the first load negative terminal, leads from the first load negative terminal, and forms a positive and negative line interval with the first cable to hook the load until the end of the line;
and step 3: the third cable lead is connected to the positive side of the load after reaching the tail end of the line and is connected with the first cable in parallel;
and 4, step 4: the negative side of the load is connected to the position from one half to three quarters of the total length of the fourth cable lead to the first cable and is connected with the second cable in parallel;
the equivalent resistance after wiring is shown in FIG. 2, R in FIG. 2 1 Is from the power supply side to a first load R L1 Cable equivalent resistance of R 2 Is the first load R L1 To a second load R L2 The equivalent resistance of the cable is analogized by the same principle, R k For the kth load R Lk The cable equivalent resistance of (1); the traditional wiring mode is load R L1 、R L2 、…、R Lk Is hung between the first cable wire and the second cable wire at intervals, and the resistance (R in figures 2 and 5) exists on the cable wires when viewed from the equivalent circuit 1 、R 2 、…、R k ) The loss generated by the mode on the remote power supply line is large, the voltage drop increases layer by layer and increases in a nonlinear increasing manner, and the voltage unbalance of each load in the line is serious; the invention providesThe wiring method is characterized in that a third cable and a fourth cable are additionally added on the basis of original wiring, the third cable is connected to the positive output wiring side of a power supply, then is directly led to the tail end of a line, is connected to the positive side of a load and is connected with a first cable in parallel, and the equivalent resistance of the third cable is R x3 The fourth cable is connected to the negative output wiring side of the power supply, then is directly led to the negative side of the load at one half to three quarters of the total length of the second cable and is connected with the second cable in parallel, and the equivalent resistance of the fourth cable is R x4 ；
To further illustrate the calculation of the method, fig. 3 shows equivalent resistance delta-connection and star-connection equivalent transformation (delta-Y transformation) used in the calculation of the method, which is hereinafter referred to as delta-Y transformation. Obviously, R 2 、R L1 And satisfy R L2 The delta connection of the three-terminal passive network is suitable for delta-Y conversion, and the equivalent resistance after conversion is shown in a right star-shaped coupling part of FIG. 3, wherein:
R B1 ＝(R L1 +R 2 )×R 2 /(R L1 +2×R 2 +R L2 ) (1)
R B2 ＝R 2 ×R L2 /(R L1 +2×R 2 +R L2 ) (2)
R B3 ＝R L2 ×(R L1 +R 2 )/(R L1 +2×R 2 +R L2 ) (3)
equivalent resistance and R after conversion 3 、R L3 And a new delta connection can be formed, and other equivalent resistances in the line can be calculated by analogy according to the calculation mode.
According to the illustration and conversion method of fig. 3, the equivalent resistance of fig. 2 can always be equivalent with the equivalent resistance of fig. 4. In the equivalent resistance diagram of FIG. 4, it can be seen that the current flows from the positive electrode to R X3 And R 1 Finally at R LBM Is taken together and passes R X4 And flowing back to the negative electrode. And it can be seen that the equivalent resistance R is compared from the head end to the tail end of the cable to the middle k And R B1 Uniform resistance, resistance R k-1 And R B2 Resistance value of oneUntil R x4 The front equivalent resistance and the rear equivalent resistance in the circuit are symmetrical in pairs up to the wiring position. If R is x4 Just cut into the middle of the cable, and R x3 Resistance value and R 1 Consistently, it is apparent that the line end voltage and the line start point are substantially consistent. In practical application, R x4 Ratio R 1 Large resistance, fourth cable R for better increasing line end voltage x4 The total length of the first cable line is generally connected to the position of 0.5-0.75, so that the effect of the line on improving the voltage is optimal;
the equivalent circuit after wiring using the prior art is shown in FIG. 5, where the load voltage before and after calculation is taken as R L3 Load as an example, load R L3 The relationship between the front load voltage and the rear load voltage is shown in formula (4):
UR L3 ＝UR L2 +(I 3+ +I 3- )×R 3 (4)
in the formula: UR L3 Is a load R L3 Voltage across, UR L2 Is a load R L2 Voltage across, R 3 Is the resistance of a cable wire, I 3+ And I 3- For passing through the resistance R of the cable wire 3 The current of (3) flows in the opposite direction; it can be seen that, as the number of the rear-stage loads and the number of the cable lines increase, the loop end of the front-stage cable bears the sum of all the rear-stage load currents, so that the line voltage drop is gradually increased; for example, R n The resistor is subjected to current flowing through R Ln And R Lk Current of R 2 Resistance subject to flow through R L2 Followed by the current of all load resistors. The larger the current is, the faster the voltage drop is, so it can be seen from the curve at the bottom of fig. 6 that the slope of the voltage drop at both ends of the load is relatively inclined at the beginning, the voltage balance at both ends of the load is poor, and even if the line diameter multiple is increased as in the curve in the middle of fig. 6, the voltage balance at both ends of the load is improved more generally;
after the wiring method is applied, the up-down directions of the current flowing through the resistance of the cable are consistent according to the equivalent circuit shown in figure 2, and finally the current is in R x4 To the negative pole, the load voltage before and after calculation, here in R L3 Load as an example, load R L3 The relationship between the front and rear load voltages is as shown in equation (5)The following steps:
UR L3 ＝UR L2 +(I 3+ -I 3- )×R 3 (5)
in the formula: UR L3 Is a load R L3 Voltage across, UR L2 Is a load R L2 Voltage across, R 3 Is the resistance of a cable wire, I 3+ And I 3- For passing through the resistance R of the cable wire 3 The current flows in the same direction, as shown in fig. 3;
as can be seen from the formula (5), the front-back voltage relation of each cable section is only related to the current value difference and the equivalent resistance of the cable, and the current direction flowing through the cable is consistent, so that the voltage drop of the rear-stage loop load relative to the front-stage loop load is very small, and R is added x3 The shunt effect of the line, the voltage in the whole line is relatively balanced; compared with the traditional wiring formula (4), the pressure drop is obvious. In practical tests, 50 stacks of lamps are connected in 2 kilometers, the voltages of the front end and the rear end are the same, the voltage difference between the middle part and the voltages of the front end and the rear end is only 2V, and the effect is very good.
It can be seen that the wiring method provided by the present invention thoroughly changes the equivalent resistance of the original whole wiring line, and the voltage drop at the end of the line can be effectively reduced through testing, as shown by the uppermost curve shown in fig. 6, the abscissa in fig. 6 is the load number uniformly connected in the cable line, and the ordinate is the voltage at the two ends of the corresponding load, so that the balance of the load voltage in the line can be ensured.
In one embodiment, the method is used for wiring of ac/dc supply lines or for wiring of communication control lines.
Reference in the specification to "some embodiments," "one embodiment," or "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in some embodiments," "in one embodiment," or "in an embodiment," or the like, in various places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In addition, the various elements of the drawings of the present application are merely schematic illustrations and are not drawn to scale.
Having thus described several aspects of at least one embodiment of this invention, it is to be appreciated various alterations, modifications, and improvements will readily occur to those skilled in the art. Such alterations, modifications, and improvements are intended to be within the spirit and scope of the invention.
Claims (2)
1. A remote AC/DC cable wiring method is characterized by comprising the following steps:
step 1: four cables are adopted for wiring, wherein a first cable and a second cable are used for hanging loads at intervals, the first cable and a third cable are connected to the positive output wiring side of a power supply, and the fourth cable is connected to the negative output wiring side of the power supply;
step 2: the second cable is connected to the first load negative terminal, leads from the first load negative terminal, and forms a positive and negative line interval with the first cable to hook the load until the end of the line;
and step 3: the third cable lead is connected to the positive side of the load after reaching the tail end of the line and is connected with the first cable in parallel;
and 4, step 4: the fourth cable lead is connected to the negative side of the load at a position of one half to three quarters of the total length of the first cable and is connected with the second cable in parallel.
2. A method of remotely cabling ac and dc cables according to claim 1, wherein: the method is used for wiring an AC/DC power supply line or a communication control line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210906102.4A CN115173317B (en) | 2022-07-29 | 2022-07-29 | Remote AC/DC cable wiring method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210906102.4A CN115173317B (en) | 2022-07-29 | 2022-07-29 | Remote AC/DC cable wiring method |
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| CN115173317A true CN115173317A (en) | 2022-10-11 |
| CN115173317B CN115173317B (en) | 2023-08-11 |
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Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3761733A (en) * | 1971-09-07 | 1973-09-25 | Ericsson Telefon Ab L M | Arrangement for uninterruptable power supply to a load from two or more a.c. power sources |
| CN202841307U (en) * | 2012-10-10 | 2013-03-27 | 宁永健 | Network remote controller |
| CN105823929A (en) * | 2016-06-08 | 2016-08-03 | 武汉大学 | Method for accurately measuring zero-sequence parameters of long-distance same-tower four-circuit power transmission line based on double-end asynchronous data |
| CN105896485A (en) * | 2016-02-05 | 2016-08-24 | 国网甘肃省电力公司 | Extra-high voltage long-distance DC line protection algorithm based on new energy grid connection |
| CN106526706A (en) * | 2016-12-09 | 2017-03-22 | 南京信息工程大学 | Portable automatic weather station |
| CN106604475A (en) * | 2017-01-10 | 2017-04-26 | 济南爱默生电源有限公司 | LED streetlamp illumination light adjusting system based on DC remote power supply |
| CN210625900U (en) * | 2019-11-17 | 2020-05-26 | 宁波思博达电子科技有限公司 | High-interference-resistance long-distance temperature detection circuit for grain storage warehouse |
| CN111576252A (en) * | 2020-06-17 | 2020-08-25 | 广西交科集团有限公司 | Real-time adjusting device and adjusting method for main beam line type in bridge pushing process |
| CN212542153U (en) * | 2020-07-22 | 2021-02-12 | 国网河南省电力公司电力科学研究院 | Sound absorption and insulation integrated device for suppressing low-frequency noise of power transformer |
| CN112462188A (en) * | 2020-10-16 | 2021-03-09 | 国网山东省电力公司济宁供电公司 | Grounding circulation simulation device and detection method based on running transmission cable line |
| CN113241752A (en) * | 2021-05-21 | 2021-08-10 | 深圳市市政设计研究院有限公司 | Power supply method and system |
| CN113433391A (en) * | 2021-06-18 | 2021-09-24 | 哈尔滨工业大学（深圳） | Circuit, method, system and storage medium for realizing remote voltage accurate control |
| CN113765375A (en) * | 2021-09-09 | 2021-12-07 | 广东福德电子有限公司 | Underwater power supply system based on constant voltage source and direct current boost |
| CN114268119A (en) * | 2022-02-08 | 2022-04-01 | 广州地铁设计研究院股份有限公司 | DC power distribution scheme design method for rail transit long-distance power utilization equipment |
-
2022
- 2022-07-29 CN CN202210906102.4A patent/CN115173317B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3761733A (en) * | 1971-09-07 | 1973-09-25 | Ericsson Telefon Ab L M | Arrangement for uninterruptable power supply to a load from two or more a.c. power sources |
| CN202841307U (en) * | 2012-10-10 | 2013-03-27 | 宁永健 | Network remote controller |
| CN105896485A (en) * | 2016-02-05 | 2016-08-24 | 国网甘肃省电力公司 | Extra-high voltage long-distance DC line protection algorithm based on new energy grid connection |
| CN105823929A (en) * | 2016-06-08 | 2016-08-03 | 武汉大学 | Method for accurately measuring zero-sequence parameters of long-distance same-tower four-circuit power transmission line based on double-end asynchronous data |
| CN106526706A (en) * | 2016-12-09 | 2017-03-22 | 南京信息工程大学 | Portable automatic weather station |
| CN106604475A (en) * | 2017-01-10 | 2017-04-26 | 济南爱默生电源有限公司 | LED streetlamp illumination light adjusting system based on DC remote power supply |
| CN210625900U (en) * | 2019-11-17 | 2020-05-26 | 宁波思博达电子科技有限公司 | High-interference-resistance long-distance temperature detection circuit for grain storage warehouse |
| CN111576252A (en) * | 2020-06-17 | 2020-08-25 | 广西交科集团有限公司 | Real-time adjusting device and adjusting method for main beam line type in bridge pushing process |
| CN212542153U (en) * | 2020-07-22 | 2021-02-12 | 国网河南省电力公司电力科学研究院 | Sound absorption and insulation integrated device for suppressing low-frequency noise of power transformer |
| CN112462188A (en) * | 2020-10-16 | 2021-03-09 | 国网山东省电力公司济宁供电公司 | Grounding circulation simulation device and detection method based on running transmission cable line |
| CN113241752A (en) * | 2021-05-21 | 2021-08-10 | 深圳市市政设计研究院有限公司 | Power supply method and system |
| CN113433391A (en) * | 2021-06-18 | 2021-09-24 | 哈尔滨工业大学（深圳） | Circuit, method, system and storage medium for realizing remote voltage accurate control |
| CN113765375A (en) * | 2021-09-09 | 2021-12-07 | 广东福德电子有限公司 | Underwater power supply system based on constant voltage source and direct current boost |
| CN114268119A (en) * | 2022-02-08 | 2022-04-01 | 广州地铁设计研究院股份有限公司 | DC power distribution scheme design method for rail transit long-distance power utilization equipment |
Non-Patent Citations (1)
| Title |
|---|
| 李妍;: "长距离电缆截面优化选择", 电工电气, no. 07, pages 59 - 60 * |
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