CN219107906U

CN219107906U - Harmonic elimination mechanism for low-voltage power supply system

Info

Publication number: CN219107906U
Application number: CN202223300012.5U
Authority: CN
Inventors: 王长春; 刘森林; 陆青松
Original assignee: Chengdu Jiaoda Electric Co ltd
Current assignee: Chengdu Jiaoda Electric Co ltd
Priority date: 2022-12-09
Filing date: 2022-12-09
Publication date: 2023-05-30
Anticipated expiration: 2032-12-09

Abstract

The utility model discloses a harmonic elimination mechanism for a low-voltage power supply system, which comprises a groove shell, a buckling groove and a single harmonic eliminator, wherein the buckling groove is arranged in the groove shell, the single harmonic eliminator is embedded in the buckling groove, spring piece groove pieces are integrally connected and installed on groove walls at the upper end and the lower end of the buckling groove, a connecting spring piece is installed in the spring piece groove of the spring piece groove pieces, end posts are fixedly installed at the two end sides of the single harmonic eliminator, extend into the spring piece groove and are pressed together with the connecting spring piece, a live wire terminal is fixedly installed at the top end of the groove shell, a lead-out terminal is fixedly installed at the bottom end of the groove shell, and the live wire terminal is electrically connected with the connecting spring piece at the top end in the buckling groove. The beneficial effects are that: the embedded single harmonic eliminator is matched with the groove shell, so that the embedded single harmonic eliminator can be suitable for realizing single-phase and multi-phase circuits, and can be used for disassembling and embedding the single harmonic eliminator during replacement, thereby being convenient and quick.

Description

Harmonic elimination mechanism for low-voltage power supply system

Technical Field

The utility model relates to the field of harmonic elimination, in particular to a harmonic elimination mechanism for a low-voltage power supply system.

Background

With the rapid development of high-speed railways in China, high-power alternating current transmission electric locomotives based on PWM technology are widely adopted, so that the electric energy management of a traction power supply system has some new characteristics, namely 3,5,7 and 9 harmonics in the traction power supply system are reduced, the higher harmonics of more than 20 times are obviously increased, the harmonic electric energy management problem of a wide frequency range (about 3-70 times) occurs in the system, the higher harmonics problem of a low-voltage distribution system is more prominent, the phenomena of burning of a charging module in a substation, air conditioning, computer damage, damage to a protection comprehensive self-waiting screen cabinet signal indicator, damage to the generated active electric equipment and the like are mainly shown, part of communication signal power is also reduced from a traction network, and the fault of a signal system can be caused.

Disclosure of Invention

The present utility model has been made to solve the above-described problems, and an object of the present utility model is to provide a harmonic cancellation mechanism for a low-voltage power supply system.

The utility model realizes the above purpose through the following technical scheme:

the utility model provides a harmonic elimination mechanism for low voltage power supply system, includes the cell casing, withholds groove and monomer harmonic eliminator, be equipped with in the cell casing withhold the inslot and be equipped with the monomer harmonic eliminator, it installs the shell fragment cell spare to withhold an organic whole on the cell wall of the upper and lower both ends side of groove, install in the shell fragment groove of shell fragment cell spare and link electric shell fragment, the both ends side fixed mounting of monomer harmonic eliminator has the end post, the end post extends to in the shell fragment inslot and with link electric shell fragment pressure to establish together, the top fixed mounting of cell casing has the live wire terminal, the bottom fixed mounting of cell casing has a derivation terminal, the live wire terminal with withhold the top in the inslot link electric shell fragment electricity to link together, derive the terminal with it links together to link electric shell fragment bottom in the withhold inslot, install passive higher order filter circuit in the shell fragment inslot, passive higher order filter circuit's both ends respectively with two end post electricity are connected together.

Further, the passive high-order filter circuit consists of a control switch, a high-pass module circuit, a current-limiting protection circuit and a fuse, and the control switch, the high-pass module circuit, the current-limiting protection circuit and the fuse are sequentially connected in series;

furthermore, the high-pass module circuit is formed by connecting a capacitor and an inductor in parallel, and the current-limiting protection circuit is formed by connecting two resistors in parallel.

Further, finger grooves are formed in the groove walls on the left side and the right side of the buckling groove.

Further, a plurality of mounting screw holes are formed in the groove shell.

The beneficial effects are that: the harmonic elimination mechanism for the low-voltage power supply system is suitable for realizing single-phase and multi-phase circuits through the embedded single-body harmonic eliminator matched with the groove shell, can be completed only by disassembling and embedding the single body when the single-body harmonic eliminator is replaced, does not need to cut off power of the system, is convenient and quick, and is provided with a fuse to protect the circuits.

Drawings

FIG. 1 is a schematic diagram of a harmonic cancellation mechanism for a low voltage power supply system according to the present utility model;

FIG. 2 is a schematic diagram of the internal circuit connections of the harmonic cancellation mechanism for the low voltage power supply system of the present utility model;

fig. 3 is an enlarged schematic view of a structure a of the harmonic cancellation mechanism for a low-voltage power supply system according to the present utility model.

The reference numerals are explained as follows:

1. a slot housing; 2. a buckling groove; 3. a monomer harmonic canceller; 4. a live wire terminal; 5. a lead-out terminal; 6. installing a screw hole; 7. a control switch; 8. finger grooves; 9. a high-pass module circuit; 10. a current limiting protection circuit; 11. a fuse; 12. an end post; 13. spring plate groove parts; 14. and the electric spring piece is connected.

Detailed Description

The utility model is further described below with reference to the accompanying drawings:

as shown in fig. 1-3, the harmonic elimination mechanism for a low-voltage power supply system is applied to a three-phase circuit, and the specific implementation manner is as follows:

the harmonic elimination mechanism for the low-voltage power supply system consists of a groove shell 1, a buckling groove 2 and a single harmonic eliminator 3;

the groove shell 1 is used as an outer protective structure of the harmonic elimination mechanism in the embodiment, buckling grooves 2 are formed in the groove shell, three buckling grooves are arranged in the embodiment, the three buckling grooves correspond to three-phase live wires in a low-voltage power supply system respectively, a single harmonic eliminator 3 is embedded in the buckling grooves 2, the single harmonic eliminator 3 is mainly used for eliminating higher harmonics in a single live wire, and the single harmonic eliminator is movably embedded in the buckling grooves 2, so that replacement and installation are facilitated;

the upper end and the lower end of the buckling groove 2 are integrally connected with the elastic piece groove parts 13, the elastic piece grooves of the elastic piece groove parts 13 are internally provided with the connecting elastic pieces 14, the two end sides of the single harmonic eliminator 3 are fixedly provided with end posts 12, the end posts 12 are metal end posts which are used for contacting and conducting with the connecting elastic pieces 14, and the end posts 12 extend into the elastic piece grooves and are pressed together with the connecting elastic pieces 14 to form a conducting circuit;

based on the embodiment, the three-phase low-voltage power supply system is used for a three-phase low-voltage power supply system, the top end of the tank shell 1 is fixedly provided with fire wire terminals 4, the number of the fire wire terminals 4 is three, the three fire wire terminals correspond to three buckling tanks 2 respectively, the bottom end of the tank shell 1 is fixedly provided with one lead-out terminal 5, the three fire wire terminals 4 are respectively electrically connected with three connecting elastic pieces 14 at the inner top end of the buckling tanks 2, and one lead-out terminal 5 is used for being connected with the three connecting elastic pieces 14 at the inner bottom end of the buckling tanks 2, so that the three single harmonic cancellers 3 form a Y-shaped connection structure;

a passive high-order filter circuit is arranged in the monomer harmonic eliminator 3, and two ends of the passive high-order filter circuit are respectively and electrically connected with the two end posts 12.

In this embodiment, the passive high-order filter circuit is composed of a control switch 7, a high-pass module circuit 9, a current-limiting protection circuit 10 and a fuse 11, wherein the control switch 7, the high-pass module circuit 9, the current-limiting protection circuit 10 and the fuse 11 are sequentially connected in series, the high-pass module circuit 9 is formed by connecting a capacitor with an inductor in parallel, the current-limiting protection circuit 10 is formed by connecting two resistors in parallel, and a through hole for controlling the leakage of the switch 7 is formed in the single harmonic eliminator 3, so that the control switch 7 is conveniently exposed to the outside.

In this embodiment, finger grooves 8 are formed on the groove walls on the left and right sides of the buckling groove 2, and the finger grooves 8 are used for taking and placing the single harmonic eliminator 3 by the thumb and the forefinger, so that the single harmonic eliminator is convenient to replace.

In this embodiment, the slot housing 1 is further provided with a plurality of mounting screw holes 6, and the mounting screw holes 6 are used for fixing the slot housing 1 and the slot cover body by screws, and facilitate the disassembly of the slot cover body.

The harmonic elimination mechanism for the low-voltage power supply system, which is applied to the three-phase circuit, is characterized in that three live wires of the three-phase circuit are respectively connected with three live wire terminals 4 in an installation manner, and a lead-out terminal 5 is connected with a ground wire in a crimping manner;

the three single harmonic cancellers 3 are pressed into the corresponding buckling grooves 2, the end posts 12 are pressed into the elastic sheet groove pieces 13 and are in contact connection with the connecting elastic sheets 14, the control switch 7 is started, resonance is generated when the harmonic frequency is achieved through the capacitance and the inductance of the passive device, a low-resistance passage for leading the harmonic into the ground is provided, the harmonic is led into the ground to be separated from the power grid, a fuse is arranged for protecting a circuit, and when the circuit needs to be replaced, the single harmonic canceller 3 is only taken down for replacement.

In addition to the structure of the above embodiment being applied to a three-phase low-voltage power supply system, the number of the crimping grooves 2 may be set to one for a low-single-phase power supply system.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a harmonic elimination mechanism for low voltage power supply system which characterized in that: including groove shell body, withhold groove and monomer harmonic eliminator, be equipped with in the groove shell body withhold the groove, withhold the inslot and be equipped with the monomer harmonic eliminator, withhold and install the shell fragment cell spare on the upper and lower both ends side cell wall an organic whole connection in groove, install in the shell fragment cell of shell fragment cell spare and link electric shell fragment, the both ends side fixed mounting of monomer harmonic eliminator has the end post, the end post extends to in the shell fragment cell and with link electric shell fragment pressure to establish together, the top fixed mounting of groove shell body has the live wire terminal, the bottom fixed mounting of groove shell body has a derivation terminal, the live wire terminal with withhold the top in the groove link electric shell fragment electricity to be connected together, derive the terminal with withhold the bottom in the groove link electric shell fragment to be connected together, install passive higher order filter circuit in the monomer harmonic eliminator, passive higher order filter circuit's both ends respectively with two end post electricity are connected together.

2. The harmonic cancellation mechanism for a low voltage power supply system according to claim 1, wherein: the passive high-order filter circuit consists of a control switch, a high-pass module circuit, a current-limiting protection circuit and a fuse, and the control switch, the high-pass module circuit, the current-limiting protection circuit and the fuse are sequentially connected in series.

3. The harmonic cancellation mechanism for a low voltage power supply system according to claim 2, wherein: the high-pass module circuit is formed by connecting a capacitor and an inductor in parallel, and the current-limiting protection circuit is formed by connecting two resistors in parallel.

4. The harmonic cancellation mechanism for a low voltage power supply system according to claim 1, wherein: finger grooves are formed in the groove walls on the left side and the right side of the buckling groove.

5. The harmonic cancellation mechanism for a low voltage power supply system according to claim 1, wherein: the groove shell is also provided with a plurality of mounting screw holes.