CN106128866B - An isolating circuit breaker with built-in electronic voltage transformer - Google Patents

Abstract

The invention discloses an isolation circuit breaker with a built-in electronic voltage transformer, which is characterized in that it comprises: an arc extinguishing chamber bushing, an intermediate flange, an epoxy resin barrel, a film-paper capacitor voltage divider, a supporting bushing, an insulating Tie rod, signal line inside the wall of the support sleeve, signal line outside the wall of the support sleeve, bottom flange of the support sleeve, sealed terminal, remote module, optical fiber, merging unit, wherein: the sleeve of the arc extinguishing chamber and the support sleeve are connected separately on both sides of the middle flange. The insulating pull rod is arranged on the axle center of the arc extinguishing chamber bushing and the supporting bushing. The support sleeve and the epoxy resin cylinder are set in the coaxial direction, the inner cylinder is the epoxy resin cylinder, and the outer cylinder is the support sleeve. The film capacitor voltage divider is fixed between the support sleeve and the epoxy resin cylinder. The output signal of the film-paper capacitor voltage divider is output through the sealed terminal through the signal line in the wall of the support casing, and output to the remote module. The remote module converts the output signal of the film-paper capacitor voltage divider into a digital signal, and transmits it to the merging unit through optical fiber.

Description

An isolating circuit breaker with built-in electronic voltage transformer

technical field

The invention relates to a switchgear for a smart grid, and more specifically, to an isolating circuit breaker with a built-in electronic voltage transformer.

Background technique

my country began to build a new generation of smart substations in 2013, and the integrated isolation circuit breaker has become one of the important primary equipment in the new generation of substations. Up to now, domestic manufacturers have successfully developed 126kV ~ 363kV isolation circuit breaker equipment, and have been demonstrated and applied in the new generation of smart substations built by the State Grid Corporation of China. However, the integrated isolation circuit breaker demonstrated and applied in the first phase of the new generation of smart substations and expanded demonstration projects in my country only integrated electronic current transformers, and products integrating electronic voltage transformers have not yet been developed. With the further reduction of substation footprint, the requirements for equipment integration will inevitably become higher and higher. It is necessary to carry out research on the integration technology of electronic voltage transformers and isolation circuit breakers to lay the foundation for further intelligence and miniaturization of isolation circuit breakers. .

In the existing outdoor high-voltage switchgear, the high-voltage isolation circuit breaker and the voltage transformer are usually manufactured as independent products. During installation, respective brackets must be installed on the outdoor pole tower and connected separately. Disadvantages such as high installation cost, cumbersome installation procedures, etc. The external voltage transformer requires additional mounting brackets and connecting wires, which poses hidden dangers to the safety of high-voltage line protection and affects the appearance of the power grid line system.

Contents of the invention

In order to solve the above problems, the present invention provides an isolation circuit breaker with a built-in electronic voltage transformer, which is characterized in that it includes: an arc extinguishing chamber bushing, an intermediate flange, an epoxy resin cylinder, a film-paper capacitor voltage divider, Support sleeve, insulating tie rod, support sleeve wall signal line, support sleeve wall outside signal line, support sleeve bottom flange, sealed terminal, remote module, optical fiber, merging unit, of which:

The arc extinguishing chamber bushing and the supporting bushing are respectively connected to both sides of the intermediate flange; the insulating pull rod is arranged at the axis of the arc extinguishing chamber bushing and the supporting bushing; the supporting The casing and the epoxy resin cylinder are set in the coaxial direction, the inner cylinder is the epoxy resin cylinder, and the outer cylinder is the support sleeve; the film paper capacitor voltage divider is fixed on the coaxial support between the sleeve and the epoxy resin cylinder; the output signal of the film capacitor voltage divider is output through the sealed terminal on the bottom flange of the support sleeve by using the signal line in the wall of the support sleeve, and via The parallel circuit established between the sealed terminal and the remote module transmits the output signal to the remote module; the remote module transmits the output signal of the film paper capacitor voltage divider via the optical fiber transmitted to the merging unit.

Preferably, the inner diameter of the cylinder wall of the outer cylinder is adjusted according to the volume of the membrane paper capacitive voltage divider.

Preferably, the capacitance value of the film-paper capacitive voltage divider can be adjusted, and the film-paper capacitive voltage divider is in 4 strings, which are evenly and symmetrically distributed between the coaxial inner cylinder and the outer cylinder.

Preferably, SF ₆ gas of the same pressure is filled between the coaxial inner cylinder and the outer cylinder and in the inner cylinder, and the pressure of the SF ₆ gas is the same as the gas pressure in the bushing of the arc extinguishing chamber.

Preferably, the coaxial inner cylinder and outer cylinder are connected by a gas pipeline, and an SF ₆ density gauge is arranged outside the support sleeve.

Preferably, the sealed terminal and the remote module establish a parallel circuit through the external signal line of the supporting sleeve.

Preferably, the signal wire inside the wall of the support sleeve and the signal wire outside the wall of the support sleeve are shielded twisted-pair wires.

Preferably, the remote module converts the received analog voltage signal into a digital signal, and transmits the digital signal to the merging unit via the optical fiber.

Preferably, the number of sealed terminals is 4, including 1 main sealed terminal, and the remaining 3 sealed terminals are respectively connected to the main sealed terminal; the parallel connection established between the main sealed terminal and the remote module circuit, and transmit the output signal of the membrane-paper capacitive voltage divider to the remote module via the parallel circuit.

According to the isolation circuit breaker with built-in electronic voltage transformer proposed by the present invention, the implementation mode proposed by the invention integrates the electronic voltage transformer and the isolation circuit breaker, which improves the degree of equipment integration and saves equipment. footprint. Moreover, the integrated structure of the electronic voltage transformer and the isolating circuit breaker proposed by the present invention does not change the insulation structure inside the supporting sleeve of the original isolating circuit breaker, and does not affect the internal electric field distribution. In the proposal of the present invention, the size of the capacitance determines the volume of the film-paper capacitor voltage divider, and the inner diameter of the supporting sleeve can be adjusted and set according to the volume of the film-paper capacitor. Electronic voltage transformers generally adopt a film-paper capacitor voltage divider and an oil-filled solution. The embodiment of the present invention fills the space where the film-paper capacitor voltage divider is arranged with SF ₆ gas. The embodiment of the present invention simplifies the installation process of the equipment. At the same time, it also prevents the internal epoxy resin cylinder from bearing the internal and external pressure difference.

Description of drawings

A more complete understanding of the exemplary embodiments of the present invention can be had by referring to the following drawings:

Fig. 1 is a schematic structural diagram of an isolation circuit breaker with a built-in voltage transformer according to an embodiment of the present invention;

Fig. 2 is a schematic diagram of the arrangement structure of a film-paper capacitor voltage divider according to an embodiment of the present invention;

Fig. 3 is a connection diagram between a sealed terminal and a remote module according to an embodiment of the present invention.

Detailed ways

Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units/elements are given the same reference numerals.

Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or overly formal meanings.

Fig. 1 is a schematic structural diagram of an isolation circuit breaker with a built-in voltage transformer according to an embodiment of the present invention. As shown in Figure 1, an isolation circuit breaker 100 with a built-in electronic voltage transformer according to an embodiment of the present invention includes: an arc extinguishing chamber bushing 101, an intermediate flange 102, an epoxy resin cylinder 103, and a film-paper capacitor voltage divider Device 104, supporting sleeve 109, insulating pull rod 108, signal line 105 in the wall of supporting sleeve, bottom flange 110 of supporting sleeve, sealed terminal 111, remote module 107, optical fiber 112, merging unit 113, among which: arc extinguishing chamber The bushing 101 and the supporting bushing 109 are respectively connected to both sides of the middle flange 102; the insulating rod 108 is set on the axis of the arc extinguishing chamber bushing 101 and the supporting bushing 109; the supporting bushing 109 and the epoxy resin cylinder 103 are the same It is arranged in the axial direction, the inner cylinder is an epoxy resin cylinder 103 , and the outer cylinder is a support sleeve 109 . The film capacitor voltage divider 104 is fixed between the coaxial support sleeve 109 and the epoxy resin cylinder 103 . The output signal of the film paper capacitor voltage divider 104 is output through the sealed terminal 111 on the bottom flange 110 of the supporting sleeve 109 through the signal line 105 in the wall of the supporting sleeve, and output to the parallel connection established between the sealed terminal 111 and the remote module 107 circuit. The remote module 107 transmits the output signal of the film-paper capacitive voltage divider 104 to the combining unit 113 via the optical fiber 112 .

Preferably, as shown in FIG. 1 , in the isolating circuit breaker 100 proposed by the present invention, the inner diameter of the cylinder wall of the outer cylinder is adjusted according to the volume of the film capacitor voltage divider 104 . The inner diameter of the wall of the epoxy resin cylinder 103 of the isolation circuit breaker 100 is the same as that of the support sleeve of the original isolation circuit breaker. The electric field analysis shows that the isolation circuit breaker 100 does not change the insulation structure inside the support sleeve 109 . The inner diameter of the cylinder wall of the supporting sleeve 109 is adjusted according to the volume of the film-paper capacitor voltage divider 104, so as to shorten the distance between the isolation circuit breaker 100 and the film-paper capacitor voltage divider 104 to the greatest extent, and reduce the footprint of the equipment.

Preferably, as shown in Fig. 1, in the isolation circuit breaker 100 proposed by the present invention, the capacitance value of the membrane paper capacitor voltage divider 104 can be adjusted, and the membrane paper capacitor voltage divider 104 is 4 strings, which are evenly and symmetrically distributed in the same Between the inner cylinder and the outer cylinder of the shaft. Preferably, the connection relationship between the 4-series film paper capacitor and the sealed terminal is (not shown in Figure 1, see Figure 3 for details): the 4-series film paper capacitor voltage divider is connected to the support sleeve 109 via the signal line 105 in the wall of the support sleeve The four sealing terminals 111 on the bottom flange 110 are connected to each other, one of the sealing terminals is set as the main sealing terminal, and the other three sealing terminals are respectively connected to the main sealing terminals. A parallel circuit is established between the main sealed terminal and the remote module 107 . The output signal of the membrane paper capacitive voltage divider 104 is transmitted to the remote module 107 through the main sealed terminal.

Preferably, as shown in Figure 1, in the isolating circuit breaker 100 proposed by the present invention, between the coaxial inner cylinder and the outer cylinder, and the inner cylinder is filled with SF ₆ gas of the same pressure, the pressure of SF ₆ gas is related to the arc extinguishing The gas pressure in the chamber casing is the same. In the embodiment proposed by the present invention, SF ₆ gas is filled in the space where the film-paper capacitor voltage divider 104 is located, which simplifies the installation process of the equipment, and also prevents the inner cylinder epoxy resin cylinder 103 from bearing the pressure difference between internal and external gases.

Preferably, as shown in FIG. 1 , in the isolating circuit breaker 100 proposed by the present invention, the coaxial inner cylinder and the outer cylinder are connected by a gas pipeline, and an SF ₆ density meter is arranged outside the supporting sleeve 109 . Since the insulation and arc extinguishing performance of SF ₆ circuit breaker depends largely on the purity and density of SF ₆ gas, it is very important to monitor the purity and density of SF ₆ gas. The SF ₆ density meter is used for monitoring and protection.

Preferably, as shown in FIG. 1 , in the isolation circuit breaker 100 proposed by the present invention, the sealed terminal 111 and the remote module 107 establish a parallel circuit through the signal line 106 outside the wall of the support sleeve.

Preferably, as shown in FIG. 1 , in the isolating circuit breaker 100 proposed by the present invention, the signal wire 105 inside the wall of the supporting sleeve and the signal wire 106 outside the wall of the supporting sleeve are shielded twisted-pair wires.

Preferably, as shown in FIG. 1 , in the isolation circuit breaker 100 proposed by the present invention, the remote module 107 converts the received analog voltage signal into a digital signal, and transmits the digital signal to the merging unit 113 via the optical fiber 112 .

Fig. 2 is a schematic diagram of the arrangement structure of a film-paper capacitive voltage divider according to an embodiment of the present invention. As shown in Figure 2, the capacitance value of the built-in membrane paper capacitor voltage divider 202 of the isolation circuit breaker according to the embodiment of the present invention can be adjusted. Between the oxygen resin cylinders 203.

Fig. 3 is a connection diagram between a sealed terminal and a remote module according to an embodiment of the present invention. The 4-series film paper capacitor voltage divider is connected to the 4 sealing terminals on the bottom flange of the supporting sleeve through the signal line in the wall of the supporting sleeve, and one of the sealing terminals is set as the main sealing terminal 401, and the remaining 3 The hermetic terminal 402 , the hermetic terminal 403 , and the hermetic terminal 404 are connected to the main hermetic terminal 401 . A parallel circuit 406 is established between the main sealed terminal 401 and the remote module 405 . The output signal of the film-paper capacitor voltage divider is output to the remote module 405 through the main sealed terminal 401 via the parallel circuit 406 .

According to the isolation circuit breaker with built-in electronic voltage transformer proposed by the present invention, the implementation mode proposed by the invention integrates the electronic voltage transformer and the isolation circuit breaker, which improves the degree of equipment integration and saves equipment. footprint. Moreover, the integrated structure of the electronic voltage transformer and the isolating circuit breaker proposed by the present invention does not change the insulation structure inside the supporting sleeve of the original isolating circuit breaker, and does not affect the internal electric field distribution. In this solution, the size of the capacitance determines the volume of the film-paper capacitor voltage divider, and the inner diameter of the supporting sleeve can be adjusted and set according to the volume of the film-paper capacitor. Electronic voltage transformers generally adopt a film-paper capacitor voltage divider and an oil-filled solution. The embodiment of the present invention fills the space where the film-paper capacitor voltage divider is arranged with SF ₆ gas. The embodiment of the present invention simplifies the installation process of the equipment. At the same time, it also prevents the internal epoxy resin cylinder from bearing the internal and external pressure difference.

The invention has been described with reference to a small number of embodiments. However, it is clear to a person skilled in the art that other embodiments than the invention disclosed above are equally within the scope of the invention, as defined by the appended patent claims.

Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise therein. All references to "a/the/the [means, component, etc.]" are openly construed to mean at least one instance of said means, component, etc., unless expressly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

Claims (9)

1. a kind of isolation circuit breakers of in-built electrical minor voltage transformer characterized by comprising arc-chutes casing, intermediate method Orchid, film paper capacitor divider, supports casing, insulated pull rod, supports signal wire in casing wall, supports casing wall epoxy resin cylinder External signal line supports sleeve bottom flange, hermetic terminal, remote end module, optical fiber, combining unit, in which:

The arc-chutes casing and the support casing are connected to the spacer flanger two sides；The insulated pull rod setting exists The arc-chutes casing and the axle center for supporting casing；The support casing is set with the epoxy resin cylinder for coaxial direction It sets, inner cylinder is the epoxy resin cylinder, and outer cylinder is the support casing；The film paper capacitor divider is fixed on coaxial described It supports between casing and epoxy resin cylinder；Passed through on the support sleeve bottom flange using signal wire in the support casing wall The hermetic terminal export the output signal of the film paper capacitor divider, and via the hermetic terminal and the distal end The output signal is transferred to the remote end module by the parallel circuit established between module；The remote end module is via the light The output signal of the film paper capacitor divider is transmitted to the combining unit by fibre.

2. the internal diameter of isolation circuit breakers according to claim 1, the barrel of the outer cylinder is divided according to the film paper capacitor The volume of device is adjusted.

3. the capacitance of isolation circuit breakers according to claim 1, the film paper capacitor divider can be adjusted, the film Paper capacitor divider is 4 strings, evenly and symmetrically is distributed between the coaxial inner cylinder and outer cylinder.

4. isolation circuit breakers according to claim 1 fill between the coaxial inner cylinder and outer cylinder and in the inner cylinder Enter the SF of uniform pressure₆Gas, the SF₆Gas pressure is identical as gas pressure in the arc-chutes casing.

5. isolation circuit breakers according to claim 1 are connected between the coaxial inner cylinder and outer cylinder by gas piping, And SF is configured outside the support casing₆Density meter.

6. isolation circuit breakers according to claim 1, the hermetic terminal and the remote end module are covered by the support Tube wall external signal line establishes parallel circuit.

7. isolation circuit breakers according to claim 1, in the support casing wall outside signal wire and the support casing wall Signal wire is Shielded Twisted Pair.

8. isolation circuit breakers according to claim 1, the remote end module is converted to the analog voltage signal received Digital signal, and the digital signal is transmitted to the combining unit via the optical fiber.

9. isolation circuit breakers according to claim 1, the hermetic terminal quantity is 4, including 1 primary seal terminal, Remaining 3 hermetic terminal is connect with the primary seal terminal respectively；It is built between the primary seal terminal and the remote end module Vertical parallel circuit, and the output signal of the film paper capacitor divider is transferred to the distal end mould via the parallel circuit Block.