CN205647040U - High pressure overhead transmission line goes up ground wire induction electricity -taking device - Google Patents

Abstract

The utility model provides a ground wire induction power-taking device on a high-voltage overhead power transmission line, which includes a power-taking power supply, a multi-level iron tower and two overhead ground wires erected on the multi-level iron tower; wherein, one overhead ground wire The grounding method is connected to each iron tower; another overhead ground wire is insulated and single-point grounded to form a power-taking ground segment; one end of the power-taking power supply is connected to the ground wire insulation end of the power-taking ground segment, and the other end is connected to the tower grounding , the electric power source converts the induced electric energy on the electric ground segment into electric energy to supply power to the line monitoring system. This power supply method has good continuity and will not be affected by weather conditions. Compared with solar or wind energy, it can greatly reduce the capacity of the energy storage battery. The overall cost of the online monitoring system is reduced, its stability and reliability are improved, and the power supply problem of the online monitoring equipment can be solved with low cost and high reliability.

Description

A ground wire induction power picking device on a high-voltage overhead transmission line

【Technical field】

The utility model belongs to the technical field of high-voltage power supply, and relates to a power supply for inductively picking up power from the ground wire of a high-voltage overhead transmission line, in particular to a device for inductively picking up power from the ground line on a high-voltage overhead transmission line.

【Background technique】

With the continuous expansion of the power grid system, the online monitoring system of high-voltage transmission lines has become an important part of the construction of "smart transmission lines". However, online monitoring equipment is usually installed on outdoor high-voltage iron towers. Since there is no power supply from the low-voltage power grid, having a stable and reliable power supply is the first problem that must be solved for online monitoring equipment. It directly affects the stability and stability of the online monitoring system. reliability. At present, the power supply mode of the online monitoring system is mainly battery plus solar energy or solar energy and wind energy complementary power supply. The main disadvantage of this type of power supply method is that it is greatly affected by meteorological conditions. Under good weather conditions, the power supply can meet the power supply requirements, but it is prone to line failures (the power consumption of the monitoring system increases), and the weather conditions are bad ( Low temperature, icing, rainy days or insufficient light, etc.), the power supply cannot guarantee the long-term normal operation of the online monitoring system. In order to solve this problem, it is often to increase the power of solar panels or wind generators, and at the same time increase the capacity of the storage battery, which will increase the volume and greatly increase the cost, and also increase the difficulty for the installation of the online monitoring device.

The principle of ground wire

The ground wire (lightning protection wire) on the high-voltage overhead transmission line is erected for lightning protection of the transmission line. When the line is in normal operation, a certain induced voltage will be generated on the ground wire. Induced current is formed when there is a current channel between the ground wire and the ground wire or between the ground wire and the earth. Therefore, if the ground wire is "grounded tower by tower", it will cause a certain degree of circulation loss. In order to reduce the line loss, the ground wire is usually grounded through a small gap. When the line is in normal operation, the lightning conductor is insulated from the ground to eliminate the circulation. Loss, when the overhead ground wire is struck by lightning, the gap is broken down, and the ground wire is grounded to achieve the purpose of lightning protection. After the overhead ground wire is insulated, the induced voltage is proportional to the length of the insulated ground wire and the load current of the line. If the insulation section of the ground wire is too long, the induced voltage will be very high, which will cause gap discharge or insulator damage when the line is in normal operation. was broken down.

【Content of utility model】

The purpose of the utility model is to solve the deficiency of the existing online monitoring equipment power supply technology, and provide a ground wire induction power picking device on the high-voltage overhead transmission line. This power supply mode has good continuity and will not be affected by meteorological conditions. Compared with wind energy or wind energy, the capacity of energy storage batteries can be greatly reduced. The overall cost of the online monitoring system is reduced, its stability and reliability are improved, and the power supply problem of the online monitoring equipment can be solved with low cost and high reliability.

The purpose of this utility model is achieved by the following technical solutions:

A ground wire induction power-taking device on a high-voltage overhead transmission line, including a power-taking power supply, a multi-level iron tower, and two overhead ground wires erected on the multi-level iron tower; wherein, one overhead ground wire is grounded tower by tower. Each iron tower is connected; another overhead ground wire is segmented and insulated and single-point grounded to form a power-taking ground wire section; The electric power supply converts the induced electric energy on the ground wire segment into electric energy to supply power to the online monitoring system.

The power supply includes a connector, a voltage converter, a rectifier filter, and an output voltage conditioning circuit; the connector introduces the voltage on the insulating end of the ground wire into the voltage detection and control unit and the non-contact switch through the reactor, and the voltage The detection and control unit controls the non-contact switch, the output of the non-contact switch is connected to the primary input of the voltage converter, and the secondary output of the voltage converter obtains DC voltage through the rectification filter, and then connects to the voltage conditioning circuit through the output of the voltage stabilizing circuit , the voltage conditioning circuit outputs electric energy; the primary output terminals of the voltage detection and control unit and the voltage converter are connected to the tower ground, and the rectifier filter is grounded at low voltage.

It also includes a lightning arrester connected to the output end of the reactor, and the lightning arrester is connected to the grounding of the iron tower.

It also includes a transient overvoltage protection circuit connected to the output end of the non-contact switch, and the transient overvoltage protection circuit is connected to the grounding of the iron tower.

It also includes an overvoltage protector connected to the output terminal of the rectification filter, and the overvoltage protector is grounded.

It also includes a storage battery connected to the voltage stabilizing circuit, the storage battery is connected to the voltage conditioning circuit; the storage battery is grounded.

The voltage stabilizing circuit is composed of a wide-input buck-boost switch voltage stabilizing unit, and the input voltage range is 8V-100V.

The length of the access electric ground line section is 1-3 km.

Compared with the prior art, the utility model has the following technical effects:

The power supply of the utility model uses the induced voltage on the ground wire (lightning protection wire) to obtain electric energy through the power fetching device. The ground wire is insulated and grounded at a single point. There will still be a certain induced voltage at the end of the power supply. One end of the input of the power supply is connected to the insulated end of the power supply ground wire, and the other end is connected to the tower ground, and the ground wire is here to obtain power for use. This not only eliminates the circulation loss, but also avoids the harm caused by the high induced voltage of the insulation section. The utility model takes power from the induction of the lightning protection ground wire on the overhead transmission line, and utilizes the loss of the transmission line. As long as the transmission line is in normal operation, a certain power supply can be obtained. It can supply power for various online monitoring equipment or batteries on high-voltage overhead transmission lines, and solves the problem of solar or wind power supply in the long-term no light and no wind (weak light and weak wind). The power supply continuity is good and it is not affected by weather conditions. It can effectively reduce the capacity of the energy storage battery, reduce the overall cost of the online monitoring system, improve the stability and reliability of the system power supply, and have good economic benefits. It will be the most effective power supply method for the online monitoring system in the future.

Further, the power supply includes a connector, a non-contact switch, a voltage converter, a rectifier filter, and an output voltage conditioning circuit. The connector introduces the voltage at the insulated end of the ground wire into the input of the power taking device through a reactor, and the secondary voltage converter of the voltage converter The stage output obtains a DC voltage through a rectification filter, and the DC voltage passes through a wide-input buck-boost switching regulator unit to convert the unstable DC power supply into a stable DC voltage, and the output of the switch regulator unit is connected to the output voltage conditioning circuit , the output voltage of voltage conditioning is a continuous, stable and reliable DC power supply. The reactor is connected between the insulated end of the power-taking ground wire and the input of the power-taking device, which can limit the input surge current.

Further, the primary voltage detection and control unit detects and controls the input voltage, which effectively solves the protection problem of the subsequent stage circuit when the input overvoltage occurs.

Furthermore, the non-contact switch is composed of solid state relays, which have the advantages of high withstand voltage, high current, fast switching speed and low control power consumption.

Furthermore, the composition of the voltage converter realizes the isolation of the input high-voltage side of the power-taking device and the low-voltage side of the subsequent stage and the efficient transmission of AC.

Furthermore, the power-taking device is equipped with a storage battery, which further improves the continuity and reliability of the output power. The output voltage conditioning circuit can make the output power supply of the ground wire and the storage battery supply power to the load at the same time, and can also supply power independently; when any one of them fails, the power supply of the other path will not be affected.

【Description of drawings】

Fig. 1 is a schematic diagram of the structure of the ground wire and the connection of the power-taking device of the present invention.

Fig. 2 is a functional block diagram of the utility model ground wire power-taking device.

Among them, 1 is a connector; 2 is a reactor; 3 is a lightning arrester; 4 is an input voltage detection and control unit; 5 is a non-contact switch; 6 is a transient overvoltage protection circuit; 7 is a voltage converter; 8 is a rectifier Filter; 9 is an overvoltage protector; 10 is a voltage stabilizing circuit; 11 is an energy storage battery; 12 is a voltage conditioning circuit; Insulation end; 203 is a ground end.

【detailed description】

The technical scheme of the utility model is further described in detail below in conjunction with the accompanying drawings, but the protection scope of the utility model is not limited to the following description.

The utility model ground wire power fetching device on the high-voltage overhead transmission line can be applied to the ground wire power fetching online monitoring system of the overhead power transmission line. The ground wire power fetching device includes a power fetching power supply 100, a multi-stage iron tower and Two parallel overhead lightning protection ground wires on multi-level iron towers; one of the overhead lightning protection ground wires adopts OPGW ground wire, and is connected to each iron tower in a tower-by-tower grounding manner; the other overhead lightning protection ground wire adopts Segment-insulated single-point grounding, including multiple power-taking ground wire segments 200, each segment length is 1-3km. One end of the power-taking ground wire section 200 is connected to the power-taking power source 100 , and the other end is connected to the ground terminal 203 of the iron tower.

The ground wire system converts the induced electric energy on the overhead insulated ground wire into the power supply required by the online monitoring system. The power supply is suitable for all kinds of online monitoring systems, including meteorological parameters, wire current and temperature, wire galloping, wire icing, etc., and can also supply power for video cameras, cameras and other observation equipment.

The power-taking power supply utilizes the induced voltage existing on the ground wire (lightning protection wire) to obtain electric energy through the power-taking device. One end of the power-taking power supply device 100 is connected to the insulating end 202 of the power-taking ground wire section 200, and the other end is connected to the iron tower, including connecting 1, reactor 2, lightning arrester 3, voltage detection and control unit 4, non-contact switch 5, transient overvoltage protection circuit 6, voltage converter 7, rectifier filter 8, overvoltage protector 9, wide input stabilizer Voltage circuit 10, energy storage battery 11 and output voltage conditioning circuit 12.

The connector 1 introduces the voltage of the insulated end 202 of the ground wire into the input of the power-taking device 100 through the reactor 2, and the input of the power-taking device 100 is connected to the lightning arrester 3 and the input voltage detection and control unit 4 in parallel. The lightning arrester has the function of lightning protection, and the input The voltage detection and control unit 4 controls the non-contact switch 5 to connect the input terminal to the primary stage of the voltage converter 7, the transient overvoltage protection circuit 6 is used for overvoltage protection of the subsequent circuit, and the secondary output of the voltage converter 7 is rectified and filtered The device 8 obtains a DC voltage, and the DC voltage is converted into a stable DC voltage by passing through a wide input voltage stabilizing circuit 10. The output of the voltage stabilizing circuit 10 is connected to the storage battery 11 and the voltage conditioning circuit 12, and the voltage conditioning circuit 12 The output voltage is a continuous, stable and reliable DC power supply. Provide the required power for the overhead high-voltage overhead transmission online monitoring equipment.

The connector 1 is used to connect the high voltage input end of the ground wire system 100 with the ground wire insulation end;

The reactor 2 is used to limit the transient surge current on the ground to protect the impact on the subsequent circuit;

The lightning arrester 3 is used for the lightning protection of the downstream circuit, which can neither affect the lightning protection effect of the overhead ground wire, but also ensure the safe operation of the power-taking device.

The input voltage detection and control 4 is used to automatically detect the voltage input by the ground wire. When the voltage of the electrical input is higher than the set value, the output control non-contact switch 5 disconnects the subsequent stage circuit to protect the subsequent stage voltage conversion. device; when the voltage of the electrical input is lower than the set value, the output control non-contact switch 5 is connected to the subsequent stage circuit. To ensure the safety of the subsequent stage circuit when the transmission line fails and the induced voltage of the ground wire is too high. It effectively solves the protection problem of the subsequent stage circuit when the input overvoltage occurs.

The non-contact switch 5 is composed of a solid state relay, which has the advantages of high withstand voltage, high current, fast switching speed and low control power consumption.

The transient overvoltage protection circuit 6 is used for the anti-jamming and transient AC overvoltage protection of subsequent circuits.

The voltage converter 7 is used for high-efficiency voltage conversion and isolation of high voltage and low voltage. Realize the isolation of the input high-voltage side of the power-taking device and the low-voltage side of the subsequent stage and the efficient transmission of AC.

The rectification filter 8 is used to transform the AC voltage into a smooth DC.

The overvoltage protector 9 is used for DC overvoltage protection of the post-stage voltage stabilizing circuit.

The voltage stabilizing circuit 10 is a wide-input buck-boost switching regulator, which can realize an input voltage within the range of 8V-100V, and output a fixed stable voltage value, such as 14.5V or other voltage values.

The energy storage battery 11 is used to improve the continuity and reliability of the output power. When the current of the transmission line wire is large, the power of the power is large, and the power source not only supplies power to the load, but also charges the battery with excess energy; when the current of the wire is too small or the power is cut off, the battery is discharged to ensure the continuity of the load power supply.

The output voltage conditioning circuit 12 can make the output power supply from the ground wire and the storage battery supply power to the load at the same time, or independently. When any of them fails, the power supply of the other path will not be affected, thereby improving the reliability of the power supply.

The power-taking device is designed according to the characteristics of the induced voltage, and has the following characteristics:

1) Since the induced voltage on the insulating ground wire is proportional to the load current on the transmission line, its variation range is extremely large, and the input voltage will vary from a few volts, tens of volts to hundreds of volts. Guaranteed to work normally under any conditions and provide stable and reliable power output.

2) When the transmission line fails (for example, one of the phases is short-circuited), the transient voltage induced on the ground wire will be several times the normal voltage, and the power-taking device is designed with reliable transient overvoltage and overcurrent protection.

3) The overhead ground wire system of the transmission line is installed on the overhead ground wire, which is extremely vulnerable to lightning strikes. Therefore, the ground wire system has the lightning protection effect of the overhead ground wire, and can also ensure the safe operation of the power-taking device itself.

The ground wire system is designed according to the above characteristics. The circuit schematic diagram is shown in Figure 2, including connector 1, reactor 2, lightning arrester 3, input voltage detection and control output 4, non-contact switch 5, and transient overvoltage protection circuit 6 , a voltage converter 7, a rectifier filter 8, an overvoltage protector 9, a wide input voltage stabilizing circuit 10, an energy storage battery 11 and an output voltage conditioning circuit 12, etc.

Although the embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above specific embodiments, which are only illustrative and instructive, rather than restrictive. Under the enlightenment of this specification, those skilled in the art can also make many forms without departing from the protection scope of the claims of the present invention, and these all belong to the list of the protection of the present invention.

Claims (8)

1. ground wire sensing electricity getting device on a high pressure overhead power line, it is characterised in that include power taking power supply (100), multistage Steel tower and two aerial earth wires being erected on multistage steel tower；Wherein, aerial earth wire in the way of by tower ground connection with each steel tower Connect；Another root aerial earth wire graded insulation single-point grounding forms power taking ground line segment (200)；Described power taking power supply (100) End connects the ground wire insulating end (202) of power taking ground line segment (200), and the other end connects the earth terminal (203) of steel tower, power taking power supply (100) induction electric energy in power taking ground line segment (200) is converted into electric energy to power to on-line monitoring system.

Ground wire sensing electricity getting device, described power taking power supply (100) on a kind of high pressure overhead power line the most according to claim 1 Including adapter (1), voltage changer (7), rectifier filter (8) and output voltage modulate circuit (12)；Described adapter (1) voltage on ground wire insulating end (202) is introduced voltage detecting and control unit (4) and contactless by reactor (2) Switch (5), voltage detecting and control unit (4) control noncontacting switch (5), and noncontacting switch (5) outfan becomes with voltage The primary input of parallel operation (7) is connected, and the secondary output end of voltage changer (7) obtains DC voltage by rectifier filter (8), Voltage modulate circuit (12), voltage modulate circuit (12) output electric energy is connected again through mu balanced circuit (10) output；Voltage is examined Survey and the primary output terminal of control unit (4) and voltage changer (7) is all connected with steel tower ground connection, rectifier filter (8) low pressure Ground connection.

On a kind of high pressure overhead power line the most according to claim 2, ground wire sensing electricity getting device, also includes and reactor (2) The spark gap (3) that outfan connects, spark gap (3) connects steel tower ground connection.

On a kind of high pressure overhead power line the most according to claim 2, ground wire sensing electricity getting device, also includes opening with contactless Closing the transient overvoltage protection circuit (6) that (5) outfan connects, transient overvoltage protection circuit (6) connects steel tower ground connection.

On a kind of high pressure overhead power line the most according to claim 2, ground wire sensing electricity getting device, also includes and rectifying and wave-filtering The overvoltage protector (9) that device (8) outfan connects, overvoltage protector (9) ground connection.

On a kind of high pressure overhead power line the most according to claim 2, ground wire sensing electricity getting device, also includes and mu balanced circuit (10) accumulator (11) connected, accumulator (11) connects voltage modulate circuit (12)；Accumulator (11) ground connection.

Ground wire sensing electricity getting device, described mu balanced circuit (10) on a kind of high pressure overhead power line the most according to claim 2 Being made up of width input buck switch voltage-stabilizing unit, input voltage range is 8V-100V.

Ground wire sensing electricity getting device on a kind of high pressure overhead power line the most according to claim 1, described power taking ground line segment (200) a length of 1～3km.