CN105099148A - Filtering cabinet at output end of auxiliary current transformer of electric locomotive - Google Patents

Abstract

The invention provides a filter cabinet used for the output end of the auxiliary converter of the electric locomotive, and also realizes the ground power supply for the train in the depot. The filter cabinet includes: an auxiliary transformer with high leakage inductance, a three-phase capacitor, a transformer output grounding detection device, a pre-charging circuit for a train in the depot, a steel structure frame and aluminum alloy components, etc. The filter cabinet at the output end of the auxiliary converter provided by the present invention integrates two sets of identical filter circuits, the two sets of filter circuits are mutually redundant, and the filter circuit filters the output voltage of the auxiliary converter to ensure the voltage harmonic content at the load end fulfil requirements. The present invention provides a filter cabinet for the output end of an auxiliary converter of an electric locomotive. Its parts adopt a compact design, the load-bearing frame of the cabinet adopts a steel structure, and other parts adopt aluminum alloy to reduce the weight of the cabinet and realize a lightweight design.

Description

A filter cabinet at the output end of an electric locomotive auxiliary converter

technical field

The invention relates to the manufacturing technology of railway vehicles, in particular to a filter cabinet at the output end of an auxiliary converter of an electric locomotive.

Background technique

The auxiliary converter of an electric locomotive generally adopts a DC-AC inverter circuit, and the loads on the locomotive, except for traction, are powered from the auxiliary converter. The auxiliary converter generally adopts PWM control technology, and the output voltage contains a lot of harmonics. In order to reduce the harmonic content of the output voltage, it is necessary to design a low-pass filter to filter out the high-order harmonics output by the inverter.

In the prior art, usually one auxiliary converter output corresponds to one filter cabinet, and two filter cabinets are required for two sets of converter outputs. The circuit structure inside the filter cabinet, as well as the external electrical and mechanical interfaces are basically the same. The cabinet body is generally made of steel structure, so the same electrical wiring structure and interface terminal block are formed, and the steel structure cabinet is heavy, and the two filter cabinets take up more space. Large interior space.

In the case of tight space layout and strict weight requirements in the locomotive, the installation space of the two filter cabinets is limited, which reduces the utilization of the space in the locomotive. Therefore, it is necessary to design a highly integrated and compact cabinet to facilitate the rearrangement of the electric locomotive.

Contents of the invention

In view of the above-mentioned defects in the prior art, the present invention provides a filter cabinet at the output end of the auxiliary converter of an electric locomotive. The filter cabinet integrates two sets of filter circuits in one cabinet, and the auxiliary transformers are installed side by side to reduce the installation space.

The present invention provides a filter cabinet at the output end of an auxiliary converter of an electric locomotive, which includes: an auxiliary transformer with high leakage inductance, a three-phase capacitor, a transformer output grounding detection device, a motor car pre-charging circuit in the depot, a steel structure frame and an aluminum alloy component Wait.

As mentioned above, the filter cabinet at the output end of the auxiliary converter of the electric locomotive integrates two sets of filter circuits in one cabinet, and the auxiliary transformers are installed side by side to reduce the installation space. The capacitor adopts an integrated design method, and the three capacitors are designed in one capacitor box Among them, only three terminals are drawn out.

In the filter cabinet at the output end of the auxiliary converter of the electric locomotive provided by the present invention, the transformer adopts an independent space for heat dissipation. The air duct is vertical to the transformer, which is convenient for quickly removing the heat of the transformer.

In the filter cabinet at the output end of the electric locomotive auxiliary converter provided by the present invention, the parts adopt a compact design, and the weight is mainly concentrated on the transformer. Under the condition of structural strength, realize the concept of lightweight design.

Description of drawings

Fig. 1 is a schematic diagram of the electrical topology structure of the filter cabinet at the output end of an auxiliary converter of an electric locomotive according to the present invention;

Fig. 2 is a schematic diagram of the structural layout of the filter cabinet at the output end of an auxiliary converter of an electric locomotive according to the present invention;

Explanation of the main symbols of the drawings:

TF1-auxiliary transformer 1; TF2-auxiliary transformer 2;

C12-three-phase filter capacitor 1; C22-three-phase filter capacitor 2;

K21-pre-charging contactor; K22-filter capacitor discharge contactor.

detailed description

Figure 1 is a schematic diagram of the electrical topology structure of the filter cabinet at the output end of an auxiliary converter of an electric locomotive according to the present invention. As shown in Figure 1, the electrical topology of the filter cabinet at the output end of the auxiliary converter provided by this embodiment, the filter 2 Compared with filter 1, the motor car pre-charging circuit in the library is added. Taking the filter 2 as the object of illustration, the transformer TF2 is designed with a large leakage inductance, and the leakage inductance and the three-phase capacitor C22 form a low-pass filter to filter out the higher harmonic voltage of the input voltage.

In the filter cabinet at the output end of the auxiliary converter provided in this embodiment, C21, R21 and R22 are transformer grounding detection circuits. C21 and R21 form a high-frequency voltage elimination circuit to eliminate high-frequency harmonics or peak voltage burrs. When the transformer has a ground fault, R22 generates a large potential difference, the ground current flows through the circuit breaker K23, and the auxiliary contact of the circuit breaker sends a ground fault signal, which functions as a ground detection function.

The filter cabinet at the output end of the auxiliary converter provided in this embodiment closes the contactor K21 when the motor car in the depot needs to supply power to the ground of the locomotive, and pre-charges the intermediate capacitor through the "pre-charging of the motor car in the depot" interface in Figure 1, the purpose of R24 is to limit the pre-charge current. After the pre-charge is complete, ground power is supplied through the "filter 2 output".

In the filter cabinet at the output end of the auxiliary converter provided in this embodiment, the contactor K22 is disconnected when the motor vehicle in the depot supplies power, so as to avoid the charging of the capacitor C22. When the contactor K22 is suddenly disconnected for some reason, in order to quickly discharge the filter capacitor C22, the capacitor C22 is paralleled with a discharge resistor R23.

In the filter cabinet at the output end of the auxiliary converter provided in this embodiment, the circuit realizes the output voltage filtering of the converter and has a ground detection function. The two sets of filter devices are mutually redundant, and when one set of circuits fails, the other set can bear the full load, which greatly increases the reliability of locomotive operation.

Fig. 2 is a schematic diagram of the structural layout of the filter cabinet at the output end of the auxiliary converter of the present invention. As shown in FIG. 2 , the filter cabinet at the output end of the auxiliary converter of the electric locomotive provided in this embodiment includes: two auxiliary transformers, two three-phase capacitors, a ground detection circuit and a pre-charging circuit for motor cars in the depot.

In the filter cabinet at the output end of the auxiliary converter provided in this embodiment, the auxiliary transformers are installed side by side to save installation space. The capacitor adopts an integrated design method, three capacitors are designed in one capacitor box, and only three terminals are drawn out. Two capacitors are installed up and down to save installation space. All components adopt compact design to reduce the volume of the cabinet.

In the filter cabinet at the output end of the auxiliary converter provided in this embodiment, the transformer is the most important heat dissipation component, and the space inside the cabinet is narrow. In order to strengthen the heat dissipation of the transformer, an independent installation space is designed for the transformer, and the air duct is vertical to the transformer to facilitate rapid heat dissipation of the transformer. .

In the filter cabinet at the output end of the auxiliary converter provided in this embodiment, the transformer occupies most of the weight of the filter cabinet, the load-bearing frame adopts a steel structure, and the rest of the installation parts and the air inlet duct are made of aluminum alloy materials. Under the condition of ensuring the structural strength , to realize the lightweight design concept.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (5)

1. the filter cabinet of an auxiliary converter of electric locomotive output, it is characterized in that, electric capacity precharge when this filter cabinet achieves motor-car in storehouse, it comprises: two cover filter circuits, transformer exports ground detection device and Ku Nei motor-car pre-charge circuit, steel structure frame and aluminium alloy component etc.

2. the filter cabinet of a kind of auxiliary converter of electric locomotive output according to claim 1, is characterized in that, described two cover filter circuits redundancy each other, during set of circuits fault, another set of circuits can bear whole load.

3. the filter cabinet of a kind of auxiliary converter of electric locomotive output according to claim 2, is characterized in that, the two cover filter circuits that described filter cabinet comprises adopt compact design, reduce filter cabinet volume as much as possible.

4. the filter cabinet of a kind of auxiliary converter of electric locomotive output according to claim 3, it is characterized in that, compact design taked by two cover filter circuits, and its filter cabinet load-bearing frame adopts steel construction, other parts adopt aluminium alloy to reduce cabinet weight, realize light-weight design.

5., according to the filter cabinet of the arbitrary described a kind of auxiliary converter of electric locomotive output of Claims 1-4, it is characterized in that, described filter cabinet achieves the output voltage filtering of current transformer.