CN106849369B - Energy taking device and method for overhead lightning protection ground wire of power transmission line based on CT electricity taking - Google Patents
Energy taking device and method for overhead lightning protection ground wire of power transmission line based on CT electricity taking Download PDFInfo
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- CN106849369B CN106849369B CN201710218468.1A CN201710218468A CN106849369B CN 106849369 B CN106849369 B CN 106849369B CN 201710218468 A CN201710218468 A CN 201710218468A CN 106849369 B CN106849369 B CN 106849369B
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- 230000005611 electricity Effects 0.000 title claims abstract description 59
- 230000005540 biological transmission Effects 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 119
- 238000012544 monitoring process Methods 0.000 claims abstract description 14
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 17
- 229910052710 silicon Inorganic materials 0.000 claims description 17
- 239000010703 silicon Substances 0.000 claims description 17
- 238000009434 installation Methods 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 230000001960 triggered effect Effects 0.000 claims description 6
- 238000005538 encapsulation Methods 0.000 claims description 4
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 238000005498 polishing Methods 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 230000006698 induction Effects 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
- H02H9/047—Free-wheeling circuits
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses an energy taking device and method for an overhead lightning protection ground wire of a power transmission line based on CT electricity taking, wherein the energy taking device comprises an electricity taking iron core, the electricity taking iron core is connected with an overvoltage protection unit, the overvoltage protection unit is connected with a power supply voltage stabilizing unit, and a power supply monitoring unit is connected with an output end of the overvoltage protection unit; an electricity taking iron core L1 is respectively arranged on two sides of each iron tower left and right ground wire hanging point; the output end of each electricity taking iron core L1 is connected with the input end of the overvoltage protection unit through an insulated cable; the invention utilizes the alternating magnetic field generated by the induction current on the overhead ground wire at the periphery to obtain electric energy from the alternating magnetic field through the annular electricity taking iron core, and the invention can improve the total electricity taking power of the electricity taking device by simultaneously and parallelly connecting a plurality of electricity taking iron cores; meanwhile, the overvoltage protection of the input voltage is realized by adopting a switch-type short circuit device in the power supply, so that the working efficiency and the safety of the whole power taking equipment are improved; solves the defects of the prior art.
Description
Technical Field
The invention belongs to the technical field of power supplies, and particularly relates to an energy taking device and method for an overhead lightning protection ground wire of a power transmission line based on CT power taking.
Background
With the high-speed development of national economy, the demand of various industries for electric power is larger and larger, and the requirements for providing electric power quality, namely stability, uninterrupted performance and accompanying services for power supply departments are higher and higher, so that the operation safety of a power grid of a long-distance high-voltage power transmission line is particularly important.
The current geographical environment and climate conditions of the remote high-voltage transmission line are relatively bad. And because the place where the high-voltage transmission line passes is a mountain, the monitoring of the high-voltage transmission line (hereinafter referred to as transmission line) is very difficult in the traditional manual mode.
Therefore, each ultra-high voltage transmission power bureau and power company always search for effective monitoring management means, and can effectively monitor the transmission line so as to improve the operation safety and reliability of the transmission line.
At present, some automatic monitoring means are adopted in some electric power companies, and certain effects are also achieved. In view of the current on-line monitoring products of the power transmission line in China, a power supply scheme of a photovoltaic cell and a storage battery is mostly adopted, and the scheme has the advantages that light energy is directly used, and power taking from the power transmission line is not needed to be considered. But at present, through the use of some places, the scheme also exposes a plurality of problems, and the most important aspects are:
the reliability is poor, the power supply system works for about half a year after the device is installed, and the faults are mainly caused by the limited working temperature range of the storage battery used at present and the long-term exposure to the field environment, so that the service life of the storage battery is greatly reduced;
The working state of the power supply system is greatly influenced by external environment, the energy taking efficiency of the photovoltaic panel is very low in rainy days or under the condition that the photovoltaic panel is covered with ice and ash, the energy taking efficiency is almost zero at night, and the photovoltaic panel can not be taken in winter in many places in China;
The cost of using the photovoltaic panel and the storage battery is too high, so that the popularization and the use are inconvenient;
the installation is relatively complex, and the field construction difficulty and the construction quantity are relatively large.
Therefore, how to reliably and economically obtain the electric energy required by the work of the online monitoring product through the power transmission line has great significance for the stable operation of the online monitoring product of the power transmission line.
When the transmission line carries out electric energy transmission, alternating current on the wire can generate an alternating magnetic field in space, and induction current can be generated on an overhead lightning protection ground wire of the transmission line. How to empty the ground wire induction electricity is a key to solve the above problem.
Some research institutions in China also do some related researches in the field, but mainly adopt a voltage electricity taking method, the electricity taking mode of the method is simple to realize, but the method has a weakness in use: the cable-type grounding system can be only installed in an overhead grounding network with a segmented grounding framework, and at most two power-taking devices can be installed in each strain section, so that the cable-type grounding system cannot be used at all for a tower-by-tower grounding network which is used in large quantities in China at present.
The invention comprises the following steps:
The invention aims to solve the technical problems that: the energy taking device and method for the overhead lightning protection ground wire of the power transmission line based on CT electricity taking are provided to solve the defects in the prior art.
The technical scheme of the invention is as follows:
The utility model provides a get energy device of transmission line overhead lightning protection ground wire based on CT gets electricity, it includes gets the electric iron core, it is connected with overvoltage protection unit to get the electric iron core, and overvoltage protection unit is connected with power steady voltage unit, and power monitoring unit is connected with overvoltage protection unit output.
The electricity taking iron core L1 is of an annular design and comprises an upper half iron core and a lower half iron core, the upper half iron core and the lower half iron core are aligned during installation, an overhead ground wire is surrounded in the upper half iron core and the lower half iron core, a coupling coil is wound on the annular iron core, and two ends of the coupling coil are output ends of the electricity taking iron core.
The outer part of the electricity taking iron core L1 is provided with a PVC shell, and epoxy resin is adopted for encapsulation between the iron core and the PVC shell.
The upper half iron core and the lower half iron core of the electricity taking iron core L1 are formed by cutting a round iron core; the cut iron core adopts polishing to enable the upper iron core section and the lower iron core section to be horizontal mirror surfaces, the waterproof joint is installed at the output end of the iron core, and the upper half and the lower half of the iron core are compressed by adopting annular hoops during installation.
The overvoltage protection unit comprises a silicon controlled rectifier T1, wherein the input end and the output end of the silicon controlled rectifier T1 are respectively connected with two output ends of an electricity taking iron core L1, the control end of the silicon controlled rectifier T1 is connected with one output end of a photoelectric isolator D1, when a driver outputs high level, the photoelectric isolator D1 is conducted, and the action of the control end of the silicon controlled rectifier T1 is triggered, so that the two ends of the silicon controlled rectifier T1 are conducted; when the driver Q1 outputs low level, the photo-isolator D1 is disconnected, and the control end of the thyristor T1 is triggered to act, so that the two ends of the thyristor T1 are closed.
The power supply voltage stabilizing unit is a PWM switching power supply and consists of a PWM voltage reducing chip, an inductor L2, a diode V1 and two electrolytic capacitors C1 and C2.
The power supply monitoring unit comprises a micro-processing chip CPU and a voltage sampling circuit, and the voltage sampling circuit is connected with the input end of the micro-processing chip CPU.
The energy taking method of the energy taking device of the overhead lightning protection ground wire of the power transmission line based on CT electricity taking comprises the following steps:
Step 1, respectively installing an electricity taking iron core L1 on two sides of a left ground wire hanging point and a right ground wire hanging point of each iron tower;
and 2, connecting the output end of each electricity taking iron core L1 with the input end of the overvoltage protection unit through an insulated cable.
The invention has the beneficial effects that:
The invention utilizes the alternating magnetic field generated by the induction current on the overhead ground wire at the periphery to obtain electric energy from the alternating magnetic field through the annular electricity taking iron core, and the invention can improve the total electricity taking power of the electricity taking device by simultaneously and parallelly connecting a plurality of electricity taking iron cores; meanwhile, the overvoltage protection of the input voltage is realized by adopting a switch-type short circuit device in the power supply, so that the working efficiency and the safety of the whole power taking equipment are improved; solves the defects of the prior art.
Drawings
FIG. 1 is a schematic view of an installation structure of an electricity taking iron core of the present invention;
FIG. 2 is a schematic diagram of a single ground wire installation structure of the electricity taking iron core of the invention;
FIG. 3 is a schematic view of the overall installation of the energy extraction device of the present invention;
fig. 4 is a schematic structural diagram of the working principle of the present invention.
The specific embodiment is as follows:
The utility model provides a get energy device of transmission line overhead lightning protection ground wire based on CT gets electricity, it includes gets the electric iron core, it is connected with overvoltage protection unit to get the electric iron core, and overvoltage protection unit is connected with power steady voltage unit, and power monitoring unit is connected with overvoltage protection unit output.
The overvoltage protection unit, the power supply voltage stabilizing unit and the power supply monitoring unit form a power supply device.
The electricity taking iron core L1 is of an annular design and comprises an upper half iron core and a lower half iron core, the upper half iron core and the lower half iron core are aligned when in installation, an overhead ground wire is enclosed in the upper half iron core and the lower half iron core (see figure 1), a coupling coil is wound on the annular iron core, and two ends of the coupling coil are output ends of the electricity taking iron core.
The outer part of the electricity taking iron core L1 is provided with a PVC shell, and epoxy resin is adopted for encapsulation between the iron core and the PVC shell.
The upper half iron core and the lower half iron core of the electricity taking iron core L1 are formed by cutting a round iron core; the cut iron core adopts polishing to enable the upper iron core section and the lower iron core section to be horizontal mirror surfaces, the waterproof joint is installed at the output end of the iron core, and the upper half and the lower half of the iron core are compressed by adopting annular hoops during installation.
The output of the electricity taking iron core L1 is connected with a power supply device by an insulated cable; since overhead ground wire currents are typically very small, few exceed 40A. In order to increase the total power, and avoid installing the overweight iron core of getting on single ground wire again simultaneously, can adopt a plurality of iron cores of getting to get electricity simultaneously, install an annular iron core of getting respectively on the both sides of the ground wire hanging point about every iron tower, get the total power that can the device to obtain like this and get the electricity only sum for a plurality of iron cores to make up the problem that single iron core gets the electric energy deficiency, every gets the device and can insert a plurality of output connecting cable of getting the electricity iron core simultaneously. In order to increase the waterproof capability of the electricity taking iron core, a PVC outer shell is arranged outside each half of the electricity taking iron core, and epoxy resin is adopted for encapsulation between the iron core and the PVC outer shell; the upper half and the lower half of the electricity taking iron core are formed by cutting a round iron core. The cut iron core adopts polishing to enable the cut surfaces of the upper iron core and the lower iron core to be horizontal mirror surfaces, so that the electricity taking efficiency of the iron core can be greatly improved. The output end of the iron core is provided with a waterproof joint. The upper half and the lower half of the iron core are tightly pressed by adopting annular hoops during installation.
The overvoltage protection unit comprises a silicon controlled rectifier T1, wherein the input end and the output end of the silicon controlled rectifier T1 are respectively connected with two output ends of an electricity taking iron core L1, the control end of the silicon controlled rectifier T1 is connected with one output end of a photoelectric isolator D1, when a driver outputs high level, the photoelectric isolator D1 is conducted, and the action of the control end of the silicon controlled rectifier T1 is triggered, so that the two ends of the silicon controlled rectifier T1 are conducted; when the driver Q1 outputs low level, the photo-isolator D1 is disconnected, and the control end of the thyristor T1 is triggered to act, so that the two ends of the thyristor T1 are closed. The overvoltage protection unit can prevent high voltage from being generated on the secondary side of the electricity taking iron core by high current instantaneously appearing on the ground wire.
The power supply voltage stabilizing unit is a PWM switching power supply and consists of a PWM voltage reducing chip, an inductor L2, a diode V1 and two electrolytic capacitors C1 and C2. The main function is to stabilize the input voltage and send it to the back end for output. The main function of the energy taking device is to enable the output voltage of the energy taking device to be stable so as to meet the working requirements of back-end equipment.
The power supply monitoring unit comprises a micro-processing chip CPU and a voltage sampling circuit, and the voltage sampling circuit is connected with the input end of the micro-processing chip CPU. The CPU of the micro-processing chip obtains an input voltage value through the voltage acquisition circuit, then the input voltage value is compared with a set value, if the input voltage value is higher than the set value, Q1 sends out a high level to enable the silicon controlled rectifier T1 to be conducted, the output voltage of the power taking iron core is short-circuited, otherwise, the low level is sent out to Q1 to enable the silicon controlled rectifier T1 to be disconnected, the power taking iron core L1 is enabled to output normally, and therefore the purpose of controlling the input voltage not to be excessive is achieved.
The sampling circuit is composed of resistors R2 and R3.
An energy taking method of an energy taking device of an overhead lightning protection ground wire of a power transmission line based on CT electricity taking comprises the following steps:
Step 1, respectively installing an electricity taking iron core L1 on two sides of a left ground wire hanging point and a right ground wire hanging point of each iron tower; as shown in fig. 3: and an electricity taking iron core 1-4 is arranged at the hanging point of the overhead ground wires 1 and 2 between the iron towers 1, 2 and 3.
And 2, connecting the output end of each electricity taking iron core L1 with the input end of the overvoltage protection unit through an insulated cable.
The output end of the electricity taking iron core 1-4 is connected with a power supply device.
Claims (4)
1. The utility model provides a get energy device of transmission line overhead lightning protection ground wire based on CT gets electricity, it includes gets electric iron core, its characterized in that: the power taking iron core is connected with the overvoltage protection unit, the overvoltage protection unit is connected with the power supply voltage stabilizing unit, and the power supply monitoring unit is connected with the output end of the overvoltage protection unit; the power taking iron core L1 is of an annular design and comprises an upper half iron core and a lower half iron core, the upper half iron core and the lower half iron core are aligned when in installation, an overhead ground wire is enclosed in the upper half iron core and the lower half iron core, a coupling coil is wound on the annular iron core, and two ends of the coupling coil are output ends of the power taking iron core; a PVC outer shell is arranged outside the electricity taking iron core L1, and epoxy resin is adopted for encapsulation between the iron core and the PVC outer shell; the upper half iron core and the lower half iron core of the electricity taking iron core L1 are formed by cutting a round iron core; polishing the cut iron cores to enable the cut upper and lower iron core to be horizontal mirror surfaces, installing a waterproof joint at the output end of the iron core, and compacting the upper and lower halves of the iron core by adopting annular anchor clamps during installation; the overvoltage protection unit comprises a silicon controlled rectifier T1, wherein the input end and the output end of the silicon controlled rectifier T1 are respectively connected with two output ends of an electricity taking iron core L1, the control end of the silicon controlled rectifier T1 is connected with one output end of a photoelectric isolator D1, when a driver outputs high level, the photoelectric isolator D1 is conducted, and the action of the control end of the silicon controlled rectifier T1 is triggered, so that the two ends of the silicon controlled rectifier T1 are conducted; when the driver Q1 outputs low level, the photo-isolator D1 is disconnected, and the control end of the thyristor T1 is triggered to act, so that the two ends of the thyristor T1 are closed.
2. The energy taking device of the overhead lightning protection ground wire of the power transmission line based on CT electricity taking according to claim 1, wherein the energy taking device is characterized in that: the power supply voltage stabilizing unit is a PWM switching power supply and consists of a PWM voltage reducing chip, an inductor L2, a diode V1 and two electrolytic capacitors C1 and C2.
3. The energy taking device of the overhead lightning protection ground wire of the power transmission line based on CT electricity taking according to claim 1, wherein the energy taking device is characterized in that: the power supply monitoring unit comprises a micro-processing chip CPU and a voltage sampling circuit, and the voltage sampling circuit is connected with the input end of the micro-processing chip CPU.
4. The energy taking method of the energy taking device of the overhead lightning protection ground wire of the power transmission line based on CT electricity taking, as claimed in claim 1, comprises the following steps:
Step 1, respectively installing an electricity taking iron core L1 on two sides of a left ground wire hanging point and a right ground wire hanging point of each iron tower;
and 2, connecting the output end of each electricity taking iron core L1 with the input end of the overvoltage protection unit through an insulated cable.
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| CN201710218468.1A CN106849369B (en) | 2017-04-05 | 2017-04-05 | Energy taking device and method for overhead lightning protection ground wire of power transmission line based on CT electricity taking |
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| CN201710218468.1A CN106849369B (en) | 2017-04-05 | 2017-04-05 | Energy taking device and method for overhead lightning protection ground wire of power transmission line based on CT electricity taking |
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| CN106849369B true CN106849369B (en) | 2024-05-03 |
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| CN117955257B (en) * | 2024-03-26 | 2024-06-14 | 国网上海市电力公司 | Method and system for adaptively controlling electromagnetic induction energy taking of power transmission wire |
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