CN212676895U - Higher harmonic treatment device of traction substation of electrified railway - Google Patents

Abstract

The application discloses electrified railway's traction substation's higher harmonic administers device, the device including bipolar circuit breaker, current transformer, arrester, first electric capacity, second electric capacity, first reactor, second reactor, first resistance and the second resistance that connects gradually. The first capacitor, the second capacitor, the first reactor, the second reactor, the first resistor and the second resistor form a second-order passive filter. Therefore, higher harmonics received by the contact network or the positive feeder from the electric locomotive can be filtered by the second-order passive filter and do not enter the transformer in the station, and therefore poor permeation can not be generated on a low-voltage distribution system in the station, and damage to low-voltage electric equipment in the station is avoided.

Description

Higher harmonic treatment device of traction substation of electrified railway

Technical Field

The application relates to the technical field of railways, in particular to a power supply harmonic suppression device for a traction substation of an electrified railway.

Background

The power supply used in traction substation generally has two modes: one is that the internal 27.5kV traction power supply is adopted as the power supply, and the power supply is supplied to the internal low-voltage distribution system of the station after passing through a 27.5kV/0.4kV/0.22kV transformer; and the other one adopts a 10kV power supply as a used power supply, and the power supply is supplied to a low-voltage distribution system in a station through a 10kV/0.4kV transformer. Telecontrol equipment, relay protection equipment, alternating current and direct current equipment, monitoring equipment and domestic power supply in the traction substation are all from used power supplies, and the operation stability of low-voltage equipment in the traction substation is directly determined by the quality of electric energy.

In recent years, ac-dc-ac electric locomotives are widely used, and have the advantages of large traffic volume, high speed, high power factor and the like. When the AC-DC-AC electric locomotive runs, the generated 3, 5, 7, 9 and other low-order harmonics are greatly reduced compared with the AC-DC electric locomotive, but the content of higher-order harmonics is richer. Higher harmonics permeate an upper-level power system through a traction transformer in a substation, and permeate a low-voltage distribution system in the substation through a transformer in a 27.5kV substation, so that the voltage waveform of a power supply in the substation can be seriously distorted due to the higher harmonics permeating the low-voltage distribution system in the substation, low-voltage electric equipment in the substation is damaged, and the safe operation of the traction substation is further influenced.

SUMMERY OF THE UTILITY MODEL

In view of this, the present application provides a power harmonic suppression device for a traction substation of an electrified railway, which is used for suppressing harmonics of a power used in the traction substation so as to avoid damage to low-voltage power equipment in the traction substation.

In order to achieve the above object, the following solutions are proposed:

the utility model provides a power harmonic treatment device for traction substation of electrified railway, includes circuit breaker, isolator, condenser, reactor and resistor, wherein:

the capacitor, the reactor and the capacitor are connected into a second-order passive filter, and the second-order passive filter is connected with a contact net bus or a positive feeder bus in the traction substation through the circuit breaker and the isolating switch.

Optionally, the capacitance value of the capacitor is 0.8-6.5 μ F, the resistance value of the resistor is 20-300 Ω, and the inductance value of the reactor is 10-250 mH.

Optionally, in an AT power supply mode, the power harmonic suppression device includes two second-order passive filters, where:

the second-order passive filter is arranged between a contact net of the traction substation and a concentrated grounding wire;

and the other second-order passive filter is arranged between the positive feeder of the traction substation and the centralized grounding box.

Optionally, in a direct power supply mode or a direct power supply plus loop mode, the power harmonic suppression device includes one second-order passive filter, where:

and the second-order passive filter is arranged between a contact net of the traction substation and the concentrated grounding wire.

According to the technical scheme, the application discloses a power supply harmonic suppression device for a traction substation of an electrified railway, and the device comprises a bipolar circuit breaker, a current transformer, a lightning arrester, a first capacitor, a second capacitor, a first reactor, a second reactor, a first resistor and a second resistor which are sequentially connected. The first capacitor, the second capacitor, the first reactor, the second reactor, the first resistor and the second resistor form a second-order passive filter. Therefore, higher harmonics received by the contact network or the positive feeder from the electric locomotive can be filtered by the second-order passive filter and do not enter the transformer in the station, and therefore poor permeation can not be generated on a low-voltage distribution system in the station, and damage to low-voltage electric equipment in the station is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic view of a power supply harmonic suppression device for a traction substation of an electrified railway according to an embodiment of the present application;

fig. 2 is a schematic view of another power supply harmonic suppression device for a traction substation of an electrified railway according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Example one

Fig. 1 is a schematic view of a power supply harmonic suppression device for a traction substation of an electrified railway according to an embodiment of the present application.

As shown in fig. 1, the power supply harmonic suppression device for a traction substation according to the present invention is applied to a traction substation of an electric railway, and the power supply method of the traction substation is an AT power supply method. The device specifically comprises a bipolar circuit breaker QF, a current transformer TA, a lightning arrester BL, a first capacitor C1, a second capacitor C2, a first reactor L1, a second reactor L2, a first resistor R1 and a second resistor R2. The first capacitor, the second capacitor, the first reactor, the second reactor, the first resistor and the second resistor form a second-order passive filter.

The capacitance values of the first capacitor and the second capacitor are both 4.33 muF, the inductance values of the first inductor and the second inductor are both 25mH, and the resistance values of the first resistor and the second resistor are both 60 omega.

The transformer used in the traction substation is connected with a contact net T in the traction substation, and a positive feeder F is further arranged in the traction substation.

The second-order passive filter is connected with a contact net and a positive feeder line through a bipolar circuit breaker and a disconnecting switch QS, a current transformer is arranged between the bipolar circuit breaker and the disconnecting switch, and a secondary circuit of the current transformer is connected with a relay protection device and used for carrying out overcurrent protection on a harmonic control device. The tail ends of the two sets of harmonic treatment devices are respectively connected into a centralized grounding box of the substation.

According to the technical scheme, the embodiment provides a power supply harmonic suppression device for a traction substation of an electrified railway, and the device comprises a bipolar circuit breaker, a current transformer, a lightning arrester, a first capacitor, a second capacitor, a first reactor, a second reactor, a first resistor and a second resistor which are sequentially connected. The first capacitor, the second capacitor, the first reactor, the second reactor, the first resistor and the second resistor form a second-order passive filter. Therefore, higher harmonics received by the contact network or the positive feeder from the electric locomotive can be filtered by the second-order passive filter and do not enter the transformer in the station, and therefore poor permeation can not be generated on a low-voltage distribution system in the station, and damage to low-voltage electric equipment in the station is avoided.

The present application also provides another embodiment, as shown in detail in fig. 2. The power supply method of the traction substation in this embodiment is a direct power supply method or a direct power supply and loop method.

The device comprises a single-pole circuit breaker QF1, a single-pole isolating switch QS1, a current transformer TA, a lightning arrester BL, a capacitor C, an inductor L and a resistor R, wherein the capacitance value of the capacitor is 2.16 mu F, and the inductance value of the reactor is 25 mH; the resistor has a resistance of 80 omega.

The capacitor, the inductor and the resistor form a second-order passive filter, the second-order passive filter is connected with a 27.5kV contact network (bus) through a breaker and an isolating switch, a current transformer is arranged between the breaker and the isolating switch, and a secondary circuit of the current transformer is connected to a relay protection device for performing overcurrent protection on the harmonic control device. The tail end of the harmonic wave treatment device is connected into a centralized grounding box of a substation.

The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

While preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.

The technical solutions provided by the present application are introduced in detail, and specific examples are applied in the description to explain the principles and embodiments of the present application, and the descriptions of the above examples are only used to help understanding the method and the core ideas of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (4)

1. The utility model provides a device is administered to electric railway's traction substation's higher harmonic, a serial communication port, including circuit breaker, isolator, condenser, reactor and resistor, wherein:

the capacitor, the reactor and the resistor are connected into a second-order passive filter, and the second-order passive filter is connected with a contact network bus or a positive feeder bus in the traction substation through the circuit breaker and the isolating switch.

2. The harmonic suppression device according to claim 1, wherein a capacitance value of the capacitor is 0.8 to 6.5 μ F, a resistance value of the resistor is 20 to 300 Ω, and an inductance value of the reactor is 10 to 250 mH.

3. The harmonic suppression apparatus according to claim 1 or 2, wherein the harmonic suppression apparatus includes two of the second-order passive filters in an AT power supply mode, wherein:

the second-order passive filter is arranged between a contact net of the traction substation and a concentrated grounding wire;

and the other second-order passive filter is arranged between the positive feeder of the traction substation and the centralized grounding box.

4. The harmonic suppression apparatus as claimed in claim 1 or 2, wherein the harmonic suppression apparatus comprises one of the second order passive filters in a direct power supply mode or a direct power supply plus loop mode, wherein:

and the second-order passive filter is arranged between a contact net of the traction substation and the concentrated grounding wire.

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