CN119210517A - A carrier communication coupling device and method for 110kV high voltage power cable - Google Patents

Abstract

The invention discloses a carrier communication coupling device and a carrier communication coupling method for a 110kV high-voltage power cable, which belong to the field of power line carrier communication, wherein the coupling device adopts a coupling circuit at a direct grounding box and a coupling circuit at a cross-connecting box, and the two circuits comprise a signal amplifying circuit, a carrier center frequency filtering and matching circuit, a protection circuit and a coupling capacitor which are sequentially connected, and the signal amplifying circuit is connected with a transmitting end/a receiving end; the coupling capacitor is connected with the cable shielding layer, the coupling circuit at the direct grounding box is also connected with the grounded wave-blocking inductor at the coupling capacitor, the signal amplifying circuit ensures the intensity of carrier signals, the carrier center frequency filtering and matching circuit effectively filters interference signals and noise, the protection circuit ensures the safe operation of the device in a high-voltage environment, and the accurate and efficient transmission of the carrier signals can be realized by adopting the coupling device under the condition that the normal operation of the cable is not influenced.

Description

Carrier communication coupling device and method for 110kV high-voltage power cable

Technical Field

The invention belongs to the field of power line carrier communication, and particularly relates to a carrier communication coupling device and method for a 110kV high-voltage power cable.

Background

In a power system, power line carrier communication is always regarded as an efficient and economical communication means, and the existing power line is used as a medium for data transmission, so that no communication line is required to be additionally paved, and the communication cost is remarkably reduced. However, with the development of power systems, particularly the wide application of high-voltage power systems, conventional power line carrier communication technology has presented unprecedented challenges.

The application of the traditional carrier communication device in low-voltage and medium-voltage power systems is quite mature, and the technical principle and the operation mode of the traditional carrier communication device are widely verified. However, in a high-voltage power system, the conventional carrier communication method is difficult to directly apply because of significant differences between the structure and transmission characteristics of the power cable and the conventional system. The construction of a high voltage power cable is complex, comprising parts of conductor, insulating layer, metal tape (usually acting as shielding layer) and outer sheath, which together form the transmission channel of the cable and determine the electrical and physical properties of the cable. In high voltage power cables, the shielding layer is an important component of the cable structure, the main function of which is to provide electromagnetic shielding and current diversion of fault currents. The electromagnetic shielding can effectively reduce the interference of the external environment on the internal signals of the cable, ensure the stability and reliability of the transmission signals of the cable, and guide fault current to the grounding system rapidly when the cable is short-circuited or grounded, so as to ensure the safe operation of the power system. It is this important shielding layer that provides new possibilities for carrier communication in high voltage power cables. The shielding layer is positioned outside the cable structure and directly contacts with the external environment, so that the cable structure can be used as a natural signal transmission medium. Through reasonable signal coupling technology and transmission protocol design, carrier signals can be effectively coupled to the shielding layer of the cable, and data transmission is carried out through the shielding layer. The communication mode not only utilizes the existing cable structure and avoids the trouble of additionally laying communication lines, but also can obviously reduce the interference of the power line on data transmission and improve the stability and reliability of communication through the electromagnetic shielding effect of the shielding layer.

However, despite the advantages of using cable shields for carrier communication, a number of technical challenges remain in practical use. Because the electrical characteristics of the cable shielding layer are different from those of the conductors, special coupling devices and signal processing technologies are required to be designed to ensure that signals can be accurately and efficiently transmitted, namely, how to effectively couple carrier signals to the cable shielding layer and realize carrier signal transmission without affecting the normal operation of the cable is also a problem to be solved.

Disclosure of Invention

In order to overcome the technical defects, the invention provides the carrier communication coupling device and the carrier communication coupling method for the 110kV high-voltage power cable, and the carrier signal can be accurately and efficiently transmitted under the condition that the normal operation of the cable is not influenced by the coupling device.

In order to achieve the above purpose, the present invention adopts the following technical contents:

The carrier communication coupling device for the 110kV high-voltage power cable comprises a coupling circuit at a direct grounding box and a coupling circuit at a cross-connection box;

The coupling circuit at the direct grounding box comprises a signal amplifying circuit connected with a transmitting end/receiving end, wherein the signal amplifying circuit is sequentially connected with a carrier center frequency filtering and matching circuit, a protection circuit and a first coupling capacitor, the first coupling capacitor is connected with a cable shielding layer, and is also connected with a grounded wave blocking inductor;

The cross-connection box coupling circuit comprises a signal amplifying circuit connected with a transmitting end/receiving end, wherein the signal amplifying circuit is sequentially connected with a carrier center frequency filtering and matching circuit, a protection circuit and a second coupling capacitor, and the second coupling capacitor is connected with a cable shielding layer;

the signal amplifying circuit is used for amplifying the carrier signal;

the carrier center frequency filtering and matching circuit is used for matching impedance and filtering interference signals and noise;

the protection circuit is used for protecting the carrier communication coupling device from safely operating under the high-voltage condition.

Further, the direct grounding box coupling circuit comprises a phase-to-ground direct grounding box coupling circuit and a phase-to-phase direct grounding box coupling circuit;

The first coupling capacitor of the coupling circuit at the phase-to-ground direct grounding box is connected with the cable shielding layer of one phase;

The first coupling capacitors of the coupling circuits at the interphase direct grounding box are respectively connected with the cable shielding layers of two phases.

Further, the coupling circuit at the phase-to-ground direct grounding box comprises a first coupling capacitor, and the first coupling capacitor is connected with the cable shielding layer of one phase;

The inter-phase direct grounding box coupling circuit comprises two first coupling capacitors, one sides of the two first coupling capacitors are respectively connected with the protection circuit, the other side of one first coupling capacitor is connected with one phase of cable shielding layer in three phases, and the other side of the other first coupling capacitor is connected with the other phase of cable shielding layer in three phases.

Further, the cross-header coupling circuit comprises a phase-to-ground cross-header coupling circuit and a phase-to-phase cross-header coupling circuit;

The second coupling capacitor of the coupling circuit at the phase-ground cross-connection box is connected with the cable shielding layer of one phase;

and the second coupling capacitors of the coupling circuits at the inter-phase cross-connection interconnection boxes are respectively connected with the cable shielding layers of two phases.

Further, the coupling circuit at the phase-ground cross-connection box comprises a second coupling capacitor, and the second coupling capacitor is connected with one phase of cable shielding layer;

The inter-phase cross interconnection box coupling circuit comprises two second coupling capacitors, one sides of the two second coupling capacitors are respectively connected with the protection circuit, the other side of one second coupling capacitor is connected with one phase of cable shielding layer in three phases, and the other side of the other second coupling capacitor is connected with the other phase of cable shielding layer in three phases.

Further, the signal amplifying circuit includes an amplifier connected to the transmitting/receiving end.

Further, the carrier center frequency filtering and matching circuit comprises a transformer and a band-pass filter which are connected;

the band-pass filter comprises a capacitor and an inductor which are connected in series and a capacitor and an inductor which are connected in parallel;

One side of the transformer is connected with the signal amplifying circuit, and the other side of the transformer is connected with the capacitor and the inductor which are connected in series or connected with the capacitor and the inductor which are connected in parallel.

Further, the protection circuit comprises a transient voltage suppression diode, one end of the transient voltage suppression diode is connected with the carrier center frequency filtering and matching circuit, and the other end of the transient voltage suppression diode is grounded.

Further, the transmitting end adopts a Thevenin equivalent voltage source and an equivalent internal resistance of the power amplifying circuit, and the internal resistance adopts a fixed value protection resistor for limiting the maximum output current of the power amplifier.

The working method of the carrier communication coupling device for the 110kV high-voltage power cable is based on the carrier communication coupling device and comprises the following steps:

The carrier signal sent by the sending end is sequentially transmitted to the cable shielding layer through the signal amplifying circuit, the carrier center frequency filtering and matching circuit, the protection circuit and the coupling capacitor;

The carrier signal of the cable shielding layer is transmitted to the receiving end through the coupling capacitor, the protection circuit, the carrier center frequency filtering and matching circuit and the signal amplifying circuit in sequence.

Compared with the prior art, the invention has the following beneficial effects:

The invention provides a carrier communication coupling device for a 110kV high-voltage power cable, which adopts a direct grounding box coupling circuit and a cross-connection box coupling circuit, wherein the two circuits specifically comprise a signal amplifying circuit, a carrier center frequency filtering and matching circuit, a protection circuit and a coupling capacitor which are sequentially connected, the signal amplifying circuit is connected with a transmitting end/a receiving end, the coupling capacitor is connected with a cable shielding layer, the direct grounding box coupling circuit is also connected with a grounded wave blocking inductor at the coupling capacitor, the signal amplifying circuit ensures the strength of a carrier signal, the carrier center frequency filtering and matching circuit effectively filters interference signals and noise, the protection circuit ensures the safe operation of the device in a high-voltage environment, and the device can realize accurate and efficient transmission of the carrier signal under the condition that the normal operation of the cable is not influenced.

Preferably, the direct grounding box coupling circuit adopts two modes, including the phase-to-ground direct grounding box coupling circuit and the phase-to-phase direct grounding box coupling circuit, the phase-to-phase direct grounding box coupling circuit is simpler and easier to implement, the phase-to-phase direct grounding box coupling circuit is more stable and reliable, and the two modes are arranged to enable the coupling to be more accurate and flexible, and the reliability and the efficiency of communication are improved.

Preferably, in the invention, the coupling circuit at the cross-over header adopts two modes, including the coupling circuit at the cross-over header at the phase ground and the coupling circuit at the cross-over header at the phase ground, so that the communication modes are more various and different communication requirements are met.

Preferably, in the invention, the signal amplifying circuit adopts an amplifier connected with the transmitting end/receiving end, thereby ensuring the amplifying effect of the carrier signal and improving the communication quality.

Preferably, in the invention, the carrier center frequency filtering and matching circuit comprises a transformer and a band-pass filter, thereby ensuring the frequency matching of carrier signals and the filtering of interference signals and further improving the accuracy and stability of communication.

Preferably, in the invention, the protection circuit adopts the transient voltage suppression diode, thereby effectively preventing the damage of voltage impact in a high-voltage environment to the device and ensuring the safe operation of the device.

Preferably, in the invention, the transmitting end, namely the signal source, adopts the Thevenin equivalent voltage source and the equivalent internal resistance, and the maximum output current is limited by the protection resistor with a fixed value, so that the condition of damaging a device or a cable due to overlarge power is effectively prevented.

The invention further provides a working method of the carrier communication coupling device for the 110kV high-voltage power cable, based on the carrier communication coupling device for the 110kV high-voltage power cable, carrier signals sent by a sending end are sequentially transmitted to a cable shielding layer through a signal amplifying circuit, a carrier center frequency filtering and matching circuit, a protection circuit and a coupling capacitor, the carrier signals of the cable shielding layer are sequentially transmitted to a receiving end through the coupling capacitor, the protection circuit, the carrier center frequency filtering and matching circuit and the signal amplifying circuit, accurate and efficient transmission of the carrier signals is achieved under the condition that normal operation of the cable is not affected, and the method is simple in principle and convenient to implement.

Drawings

Fig. 1 is a schematic structural diagram of a carrier communication coupling device for a 110kV high-voltage power cable according to an embodiment of the present invention;

fig. 2 is an application scenario diagram of a phase-to-ground coupling connection mode of a carrier communication coupling device for a 110kV high-voltage power cable provided by an embodiment of the present invention;

Fig. 3 is a schematic diagram of a composite coupling circuit of a transmitting end of a carrier communication coupling device for a 110kV high-voltage power cable at a direct grounding box in a phase-to-ground coupling connection mode according to an embodiment of the present invention;

Fig. 4 is a schematic diagram of a composite coupling circuit of a transmitting end of a carrier communication coupling device for a 110kV high-voltage power cable at a cross-connection box in a phase-to-ground coupling connection mode according to an embodiment of the present invention;

Fig. 5 is a schematic diagram of a composite coupling circuit of a receiving end at a direct grounding box of a carrier communication coupling device for a 110kV high-voltage power cable in a phase-to-ground coupling connection mode according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a composite coupling circuit of a receiving end at a cross-connection box of a carrier communication coupling device for a 110kV high-voltage power cable in a phase-to-ground coupling connection mode according to an embodiment of the present invention;

fig. 7 is an application scenario diagram of a phase-to-phase coupling connection mode of a carrier communication coupling device for a 110kV high-voltage power cable according to an embodiment of the present invention;

Fig. 8 is a schematic diagram of a composite coupling circuit of a transmitting end of a carrier communication coupling device for a 110kV high-voltage power cable at a direct grounding box in a phase-to-phase coupling connection mode according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a composite coupling circuit of a transmitting end of a carrier communication coupling device for a 110kV high-voltage power cable at a cross-connection box in a phase-to-phase coupling connection mode according to an embodiment of the present invention;

Fig. 10 is a schematic diagram of a composite coupling circuit of a receiving end at a direct grounding box of a carrier communication coupling device for a 110kV high-voltage power cable in a phase-to-phase coupling connection mode according to an embodiment of the present invention;

fig. 11 is a schematic diagram of a composite coupling circuit of a receiving end at a cross-connection box of a carrier communication coupling device for a 110kV high-voltage power cable in a interphase coupling connection mode according to an embodiment of the present invention.

Reference numerals:

The device comprises an amplifier-1, a transformer-2, an inductor-3, a capacitor-4, a transient voltage suppression diode-5, a first coupling capacitor-6, a second coupling capacitor-7 and a wave-blocking inductor-8.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the following specific embodiments are used for further describing the invention in detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the embodiments of the present invention, it should be noted that, if the terms "upper," "lower," "horizontal," "inner," and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the term "horizontal" if present does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present invention, it should also be noted that, unless explicitly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, or communicating between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

Example 1

In connection with the background art, in a high voltage power system, the conventional carrier communication method faces many challenges due to the difference in the structure and transmission characteristics of the power cable. In high-voltage power cables, the shielding layer is generally used for electromagnetic shielding and for the conduction of fault currents, but it can also be used as a medium for signal transmission. The shielding layer is utilized for carrier communication, so that the interference of a power line to data transmission can be reduced, and the stability and reliability of communication are improved. However, how to effectively couple carrier signals to the cable shield and achieve efficient signal transmission without affecting the normal operation of the cable is a challenge.

In order to solve the problems, the invention provides a carrier communication coupling device and a carrier communication coupling method for a 110kV high-voltage power cable, and the carrier communication coupling device can realize efficient and stable carrier signal transmission.

The invention is described in further detail below with reference to the attached drawings and examples:

as shown in fig. 1, this embodiment provides a carrier communication coupling device for a 110kV high-voltage power cable, including:

The direct grounding box coupling circuit and the cross-connection box coupling circuit are respectively connected with the power line data transmission device at one end and connected to the shielding layer (metal protective layer) of the high-voltage power cable at the other end in a coupling way, so that the carrier signal ground transmission is realized.

The carrier communication coupling device for 110kV high-voltage power cable mainly comprises a carrier center frequency filtering and matching circuit for amplifying carrier signals, for matching impedance and filtering interference signals and noise, and a protection circuit for protecting the safe operation of the carrier communication coupling device under high-voltage conditions, and has the following specific structure:

In the embodiment, the coupling circuit at the direct grounding box comprises a signal amplifying circuit, a carrier center frequency filtering and matching circuit, a protection circuit and a first coupling capacitor 6 which are sequentially connected, wherein the signal amplifying circuit is connected with a transmitting end/receiving end of a power line data transmission device, and the first coupling capacitor 6 is connected with a cable shielding layer and is also connected with a grounded wave blocking inductor 8.

In the embodiment, the coupling circuit at the cross-connection box comprises a signal amplifying circuit, a carrier center frequency filtering and matching circuit, a protection circuit and a second coupling capacitor 7 which are sequentially connected, wherein the signal amplifying circuit is connected with a transmitting end/a receiving end of the power line data transmission device, and the second coupling capacitor 7 is connected with a cable shielding layer.

The principle of the embodiment is that a composite coupling technology is adopted, a coupling capacitor is used for coupling signals to a power line or receiving carrier signals from the power line, and meanwhile, electric isolation of strong current and weak current is achieved through a transformer.

In this embodiment, the signal amplifying circuit employs an amplifier 1, and the amplifier 1 is connected to a transmitting end/receiving end.

In this embodiment, the carrier center frequency filtering and matching circuit includes a transformer 2 and a band-pass filter connected to each other, where the band-pass filter includes a capacitor 4 and an inductor 3 connected in series and a capacitor 4 and an inductor 3 connected in parallel, so that frequency matching of a carrier signal and filtering of an interference signal can be ensured, and accuracy and stability of communication are further improved.

In the embodiment, the protection circuit adopts the transient voltage suppression diode, so that the damage of voltage impact in a high-voltage environment to the device is effectively prevented, and the safe operation of the device is ensured.

The embodiment provides a carrier communication coupling device for a 110kV high-voltage power cable, which has the following working principle:

The carrier signal sent by the sending end is sequentially transmitted to the cable shielding layer through the signal amplifying circuit, the carrier center frequency filtering and matching circuit, the protection circuit and the coupling capacitor;

The carrier signal of the cable shielding layer is transmitted to the receiving end through the coupling capacitor, the protection circuit, the carrier center frequency filtering and matching circuit and the signal amplifying circuit in sequence.

Example 2

The embodiment provides another carrier communication coupling device for 110kV high-voltage power cables, which is further preferable and improved on the basis of embodiment 1, and specifically comprises the following steps:

As shown in fig. 2 and 7, in order to make the communication modes more diverse and adapt to different communication requirements, the present embodiment sets two modes, namely a phase-to-ground coupling mode and an inter-phase coupling mode, and a carrier communication coupling device structure corresponding to the two modes, where the direct grounding box coupling circuit includes a phase-to-ground direct grounding box coupling circuit and an inter-phase direct grounding box coupling circuit, and the cross-over interconnect box coupling circuit includes a phase-to-ground cross-over interconnect box coupling circuit and an inter-phase cross-over interconnect box coupling circuit.

In this embodiment, the carrier communication coupling device includes an amplifier 1, a transformer 2, a protection circuit, a capacitor 4, an inductor 3, a coupling capacitor and a choke inductor 8, which are sequentially connected, wherein:

in this embodiment, the amplifier 1 is configured to amplify the modulated signal, and improve the signal strength of the signal sent to the line, thereby increasing the signal-to-noise ratio of the receiver and improving the stability of communication.

In this embodiment, the carrier center frequency filtering and matching circuit mainly comprises a transformer 2 and a band-pass filter.

The band-pass filter comprises L-shaped, T-shaped, pi-shaped and other LC matching circuits of 3, 5, 7 and other steps, and in the embodiment, a group of serially connected capacitors 4 and inductors 3 and a group of parallelly connected capacitors 4 and inductors 3 are adopted to form the L-shaped band-pass filter, so that carrier signals of a certain frequency band can smoothly pass through, impedance matching is carried out on the frequency band, signals and noise of other frequencies are filtered, coupling efficiency is improved, and influence of refraction and reflection of waves on the signals is reduced.

The transformer 2 achieves impedance matching between the primary winding and the secondary winding, and the load obtains the maximum power available by adjusting the transformation ratio of the transformer 2.

In this embodiment, the protection circuit is mainly a transient voltage suppression diode 5, and is used for protecting the safe operation of the device under high-voltage conditions.

In the embodiment, the coupling capacitor has high impedance to low-frequency signals and low impedance to high-frequency signals, and can isolate the influence of power frequency voltage, operation overvoltage and lightning overvoltage on equipment.

In this embodiment, the coupling circuit at the direct grounding box is slightly different from the coupling circuit at the cross-connection box, and the direct grounding box has a choke inductance to ground the power frequency current, while the cross-connection box does not.

In this embodiment, the signal source side is the davin equivalent voltage source and the internal resistance of the power amplifying circuit, and the internal resistance may include a protection resistor connected in series for limiting the maximum output current of the power amplifier. In general, the equivalent internal resistance is a resistance of a fixed value.

In this embodiment, the coupling modes include a phase-to-ground coupling mode and an inter-phase coupling mode, where the phase-to-ground coupling couples the carrier signal to a line of a three-phase power line, only one coupling device is used in one carrier device, and the inter-phase coupling couples the carrier signal to a line of a two-phase power line, where two coupling devices are used in one carrier communication device.

As shown in fig. 2 to 6, the direct grounding box comprises a power line data transmission device and a phase-ground direct grounding box coupling circuit, the corresponding cross-connection box comprises the power line data transmission device and a phase-ground cross-connection box coupling circuit, the phase-ground direct grounding box coupling circuit comprises a first coupling capacitor 6, the first coupling capacitor 6 is connected with a cable shielding layer of one phase (A phase, B phase or C phase), and the phase-ground cross-connection box coupling circuit comprises a second coupling capacitor 7, and the second coupling capacitor 7 is connected with the cable shielding layer of one phase (A phase, B phase or C phase).

As shown in fig. 7 to 11, the direct grounding box comprises a power line data transmission device and an inter-phase direct grounding box coupling circuit, the corresponding cross-connection box comprises the power line data transmission device and the inter-phase cross-connection box coupling circuit, the inter-phase direct grounding box coupling circuit comprises two first coupling capacitors 6, one sides of the two first coupling capacitors 6 are respectively connected with the protection circuit, the other side of one first coupling capacitor 6 is connected with one phase (for example, phase a) cable shielding layer of three phases, and the other side of the other first coupling capacitor 6 is connected with the other phase (for example, phase B) cable shielding layer of the three phases.

In summary, the invention provides a carrier communication coupling device for a 110kV high-voltage power cable, which has the following advantages:

firstly, the carrier communication coupling device realizes stable communication under high-voltage environment through the arrangement of the coupling circuit at the direct grounding box and the coupling circuit at the cross-connection box, effectively ensures the continuity and safety of power transmission, secondly, the application of the signal amplifying circuit greatly enhances the transmission capacity of carrier signals, ensures the definition and accuracy of the signals in long-distance transmission, and the carrier center frequency filtering and matching circuit are provided, so that the impedance can be accurately matched, interference signals and noise can be effectively filtered, and the communication quality is improved. Finally, the design of the protection circuit ensures the safe operation of the carrier communication coupling device under the high-pressure condition, prolongs the service life of the equipment and reduces the maintenance cost. The device not only improves the communication performance of the high-voltage power cable, but also provides powerful guarantee for the stable operation of the power system.

The above embodiment is only one of the implementation manners capable of implementing the technical solution of the present invention, and the scope of the claimed invention is not limited to the embodiment, but also includes any changes, substitutions and other implementation manners easily recognized by those skilled in the art within the technical scope of the present invention.

Claims (10)

1. The carrier communication coupling device for the 110kV high-voltage power cable is characterized by comprising a coupling circuit at a direct grounding box and a coupling circuit at a cross-connection box;

The coupling circuit at the direct grounding box comprises a signal amplifying circuit connected with a transmitting end/receiving end, wherein the signal amplifying circuit is sequentially connected with a carrier center frequency filtering and matching circuit, a protection circuit and a first coupling capacitor (6), the first coupling capacitor (6) is connected with a cable shielding layer, and is also connected with a grounded wave blocking inductor (8);

the cross-connection box coupling circuit comprises a signal amplifying circuit connected with a transmitting end/receiving end, wherein the signal amplifying circuit is sequentially connected with a carrier center frequency filtering and matching circuit, a protection circuit and a second coupling capacitor (7), and the second coupling capacitor (7) is connected with a cable shielding layer;

the signal amplifying circuit is used for amplifying the carrier signal;

the carrier center frequency filtering and matching circuit is used for matching impedance and filtering interference signals and noise;

the protection circuit is used for protecting the carrier communication coupling device from safely operating under the high-voltage condition.

2. The carrier communication coupling device for 110kV high-voltage power cables according to claim 1, wherein the direct grounding box-side coupling circuit comprises a phase-to-ground direct grounding box-side coupling circuit and a phase-to-phase direct grounding box-side coupling circuit;

the first coupling capacitor (6) of the coupling circuit at the phase-to-ground direct grounding box is connected with the cable shielding layer of one phase;

And the first coupling capacitors (6) of the coupling circuits at the interphase direct grounding box are respectively connected with the cable shielding layers of two phases.

3. The carrier communication coupling device for the 110kV high-voltage power cable according to claim 2, wherein the coupling circuit at the grounding direct grounding box comprises a first coupling capacitor (6), and the first coupling capacitor (6) is connected with a cable shielding layer of one phase;

The inter-phase direct grounding box coupling circuit comprises two first coupling capacitors (6), one sides of the two first coupling capacitors (6) are respectively connected with the protection circuit, the other side of one first coupling capacitor (6) is connected with one phase of cable shielding layer in three phases, and the other side of the other first coupling capacitor (6) is connected with the other phase of cable shielding layer in three phases.

4. The carrier communication coupling device for 110kV high-voltage power cables according to claim 1, wherein the cross-header coupling circuit comprises a phase-to-ground cross-header coupling circuit and an inter-phase cross-header coupling circuit;

a second coupling capacitor (7) of the coupling circuit at the phase-ground cross-connection box is connected with one phase of cable shielding layer;

And the second coupling capacitors (7) of the coupling circuits at the inter-phase cross-connection boxes are respectively connected with the cable shielding layers of two phases.

5. The carrier communication coupling device for 110kV high-voltage power cables according to claim 4, wherein the coupling circuit at the phase-ground cross-connection box comprises a second coupling capacitor (7), and the second coupling capacitor (7) is connected with one phase of cable shielding layer;

The inter-phase cross interconnection box coupling circuit comprises two second coupling capacitors (7), one sides of the two second coupling capacitors (7) are respectively connected with the protection circuit, the other side of one second coupling capacitor (7) is connected with one phase of cable shielding layer in three phases, and the other side of the other second coupling capacitor (7) is connected with the other phase of cable shielding layer in three phases.

6. A carrier communication coupling device for 110kV high-voltage power cables according to claim 1, characterized in that the signal amplifying circuit comprises an amplifier (1), the amplifier (1) being connected to the transmitting/receiving end.

7. A carrier communication coupling device for 110kV high-voltage power cables according to claim 1, characterized in that the carrier center frequency filtering and matching circuit comprises a transformer (2) and a band-pass filter connected;

The band-pass filter comprises a capacitor (4) and an inductor (3) which are connected in series, and the capacitor (4) and the inductor (3) which are connected in parallel;

one side of the transformer (2) is connected with the signal amplifying circuit, and the other side of the transformer is connected with the inductor (3) by a capacitor (4) connected in series or connected with the inductor (3) by the capacitor (4) connected in parallel.

8. The carrier communication coupling device for 110kV high-voltage power cables according to claim 1, wherein the protection circuit comprises a transient voltage suppression diode (5), and one end of the transient voltage suppression diode (5) is connected with the carrier center frequency filtering and matching circuit, and the other end of the transient voltage suppression diode is grounded.

9. The carrier communication coupling device for the 110kV high-voltage power cable is characterized in that a transmission end adopts a Thevenin equivalent voltage source and an equivalent internal resistance of a power amplification circuit, and the internal resistance adopts a fixed-value protection resistor for limiting the maximum output current of the power amplifier.

10. A method of operating a carrier communication coupling device for a 110kV high voltage power cable, based on any of the carrier communication coupling devices of claims 1-9, comprising:

The carrier signal sent by the sending end is sequentially transmitted to the cable shielding layer through the signal amplifying circuit, the carrier center frequency filtering and matching circuit, the protection circuit and the coupling capacitor;

The carrier signal of the cable shielding layer is transmitted to the receiving end through the coupling capacitor, the protection circuit, the carrier center frequency filtering and matching circuit and the signal amplifying circuit in sequence.