CN202178701U

CN202178701U - Current transformer having heating device

Info

Publication number: CN202178701U
Application number: CN2011202797301U
Authority: CN
Inventors: 忻力; 秦方方; 范荣辉; 郭君博; 李鹏; 饶沛南; 陈燕平; 李华; 杨涛; 陈明翊
Original assignee: Zhuzhou CSR Times Electric Co Ltd
Current assignee: Zhuzhou CRRC Times Electric Co Ltd
Priority date: 2011-08-03
Filing date: 2011-08-03
Publication date: 2012-03-28
Anticipated expiration: 2021-08-03

Abstract

The utility model discloses a current transformer having a heating device. A cabinet heater and a transmission control module heater are disposed in the current transformer. The cabinet heater includes a heating loop, a heat dissipating loop and a temperature control loop. The heating loop is formed by connecting two resistors in series or in parallel. The heat dissipating loop is formed by connecting two axial flow fans in parallel. The temperature control loop is formed by connecting an environment temperature control box, a main temperature control switch and four temperature control switches in series. The temperature control loop controls the heating loop and the heat dissipating loop. The transmission control module heater is formed by connecting a power source, a resistor and two temperature switches in series. The current transformer having the heating device in the utility model can compensate shortcomings of a prior current transformer in a low temperature condition integrally, improve the working performance of the prior current transformer in low temperature, improve the service lifetime of the current transformer in low temperature and fundamentally widen the application range of the current transformer and facilitate the development the current transforming technology.

Description

A kind of current transformer that contains heater

Technical field

The utility model relates to current transformer, specifically is a kind of current transformer that contains heater.

Background technology

In economic and scientific and technological all current societies of fast development, current transformer is just complete and diversity and high integrated high outbound course development towards performance also, and its application is also all the more extensive, and is also increasingly high to the region and the environmental suitability requirement of current transformer.Used components and parts all have the limiting temperature value of an ability operate as normal on the current transformer, if temperature is lower than this limiting temperature value, then the traction convertor effect of can not bringing into normal play perhaps can not start at all.Nowadays Semiconductor Converting Technology is maked rapid progress, and low temperature limitation will be a great bottleneck, has seriously hindered development, application and the popularization of current transformer and Semiconductor Converting Technology.

In any use field, current transformer is being born the electrical network energy is being carried out a series of conversions back in order to drive the great task of traction electric machine all as core component, and its operation stability is most important.If current transformer uses under low temperature environment for a long time, will inevitably cause certain damage to components and parts in the current transformer, accumulate over a long period, will inevitably reduce the useful life of traction convertor, will directly produce destructive damage when serious to current transformer.

The inner components and parts kind of current transformer is many, and used suitable low temperature limitation also is not quite similar, and any one components and parts cisco unity malfunction can both influence the normal operation of current transformer under the low temperature.Receive the restriction in conventional use field and influence, the ambient temperature of existing current transformer work generally all is higher than the low temperature limit value of the inner components and parts of current transformer, and under this kind environmental condition, without heater, current transformer also can operate as normal.But along with society and rapid economy development; The application of current transformer also enlarges day by day; Use down from application extension under the normal temperature to low temperature; Undoubtedly current transformer is had higher requirement and use (cold-starting of current transformer) under the low temperature, existing current transformer can not satisfy the cryogenic applications condition of increasingly stringent.

The utility model content

The utility model technical problem to be solved is, and is not enough to prior art, and a kind of current transformer that contains heater is provided, and solves if temperature is lower than this limiting temperature value the current transformer effect of can not bringing into normal play then, the problem that perhaps at all can not start.

For solving the problems of the technologies described above; The technical scheme that the utility model adopted is: a kind of current transformer that contains heater; There are cabinet heater and motion control unit heater in current transformer inside, and wherein the cabinet heater comprises heating circuit, heat-radiation loop and temperature control loop, and heating circuit is perhaps composed in parallel by two resistance series connection; Heat-radiation loop is composed in parallel by two axial flow blowers; The temperature control loop is composed in series by ambient temperature control box, main temperature detect switch (TDS) and all the other four temperature detect switch (TDS)s, temperature control circuit controls heating circuit and heat-radiation loop, and the motion control unit heater is composed in series by power supply, resistance, two temperature detect switch (TDS)s.

The temperature control of cabinet heater is in series with fusible link in the loop, is in series with fusible link between the resistance of motion control unit heater and the temperature detect switch (TDS).

Below the utility model is described further.

The current transformer of the utility model adopts the modular construction layout; And use a large amount of busbars to connect the connection of replacement cable; Having simplified the inner circuit of current transformer connects; Under the prerequisite that does not increase the current transformer internal volume, make the inner components and parts compact in design of current transformer, saved the space in order to heater to be installed.

Consider the inner components and parts layout structure of current transformer characteristics; The motion control unit of current transformer is installed in the airtight relatively space; Other components and parts comprise that converter module is installed in the space of opening wide relatively; The used heater of current transformer of the utility model design comprises two heaters; The motion control unit of one of them smaller power (TCU) heater is used for to the motion control unit heating specially, and another more powerful cabinet heater then is used for to whole current transformer cabinet and components and parts heating thereof.Cabinet heater and TCU heater are controlled by same group of power supply, conducting simultaneously and shutoff.

The material of the inner most of components and parts of current transformer cabinet is steel; And shared volume is bigger; The temperature value that therefore need at the appointed time the cabinet temperature increase can normally be started to current transformer, cabinet heater desired power is just bigger, so that enough capacity are arranged; In addition; Need guarantee that also the cabinet heater has heat sinking function preferably; So that the heat that heater sends can be very fast the entire inner space that spreads to cabinet, the utility model has designed two axial flow blowers specially to this, be used for quickening the transmission of heater heat.Simultaneously; In order to prevent to occur localized hyperthermia's phenomenon on the heater, on heater, also be provided with the temperature detect switch (TDS) of each temperature shelves, when temperature surpasses the protection value of temperature detect switch (TDS); The automatic tripping of temperature detect switch (TDS); Heater quits work, and prevents to damage because of localized hyperthermia the components and parts of current transformer, has very strong self-protection function.

Because of the motion control unit of current transformer is installed in the space of a relative closure, the heat of cabinet heater possibly be not enough to be heated the needed temperature of normal startup, has designed the heater of a smaller power hereby specially for motion control unit.Equally, in order to prevent to occur localized hyperthermia's phenomenon on the heater, on heater, be provided with temperature detect switch (TDS); When temperature surpasses the protection value of temperature detect switch (TDS); The automatic tripping of temperature detect switch (TDS), heater quits work, and prevents to damage because of localized hyperthermia the components and parts of motion control unit.

The current transformer of the utility model design is to the Semiconductor Converting Technology of advancing by leaps and bounds now; And the continuous application of expanding of current transformer; Consider the adaptive capacity of current transformer to cold environmental conditions comprehensively; At the inner cover heater that increases of current transformer, can improve current transformer application performance at low temperatures comprehensively.Can let current transformer and inner components and parts thereof under cryogenic conditions, pass through sufficient preheating, so that reach best work starting state, the application reliability and the fail safe that improve current transformer and components and parts thereof.Therefore; The current transformer of the utility model design can remedy the existing deficiency of current transformer under cold environmental conditions on the whole, improves the service behaviour under its low temperature, improves the useful life under the current transformer low temperature; And can fundamentally promote the application of current transformer, promote the development of Semiconductor Converting Technology.

Description of drawings

Fig. 1 is the topology layout figure of the utility model current transformer;

Fig. 2 is the cabinet heater structure sketch map of the utility model current transformer;

Fig. 3 is the cabinet heater circuit principle schematic of the utility model current transformer;

Fig. 4 is TCU (motion control unit) the heater structure sketch map of the utility model current transformer;

Fig. 5 is the TCU heater circuit principle schematic of the utility model current transformer.

Wherein:

1: the cabinet heater; The 2:TCU heater; 3:TCU; 4: converter module; 5: the heating tube of cabinet heater; 6: axial flow blower; The heating tube of 7:TCU heater; 8: fan trouble protection temperature detect switch (TDS); 9: the ambient temperature control box; 10: the return air inlet temperature detect switch (TDS); 11: the air outlet temperature detect switch (TDS); 12:121 ℃ of fusible link; 13: main temperature detect switch (TDS); 14:TCU heater temperature detect switch (TDS).

Embodiment

Fig. 1 is the topology layout figure of the utility model current transformer, has very clearly demonstrated the modular construction of the utility model current transformer among the figure.It is inner that 6 converter modules 4 are evenly distributed on the current transformer cabinet, with the heat that guarantees cabinet heater 1 can be balanced spread to each converter module and other components and parts; TCU 3 is installed in the inside, an airtight relatively space, comes to its heating with the TCU heater 2 of a smaller power.

Fig. 2 and Fig. 3 are the cabinet heater structure sketch map and the circuit theory sketch mapes of the utility model current transformer, and R1 and R2 are heating tube 5, and TG1～TG5 is the temperature detect switch (TDS) of each temperature shelves value.In heater when work,, heating tube 5 is through power supply heating distribute heat, the heat balance that axial flow blower 6 distributes heating tube dispel bore at current transformer, be used for heating converter module 4 and other components and parts, also TCU 3 is had certain heat effect simultaneously.In order to prevent that localized hyperthermia's phenomenon from appearring in heater at work, be provided with the temperature detect switch (TDS) TG1～TG5 of each temperature shelves value, in order to the protection heater.

When the current transformer ambient temperature was lower than-15 ℃ ,-15 ℃ of temperature switches in the cabinet heater main circuit were in closure state, and the cabinet heater makes R1 and R2 work heating through the external power supply of resistance R 1 and R2.The power connection of while axial flow blower M1 and M2 is also started working, and dispels the inner space that is distributed to whole current transformer in order to the heat with R1 and R2 generation, and current transformer and components and parts thereof are heated.The ambient temperature control box needs only when it is higher than-15 ℃-15 ℃ of temperature switch trippings, heater stop work in order to detection at any time current transformer interior environment temperature.Fan trouble protection temperature detect switch (TDS), return air inlet temperature detect switch (TDS), air outlet temperature detect switch (TDS) and 121 ℃ of fusible links in the heater are respectively applied for the temperature protection to fan trouble, return air inlet, air outlet and main circuit, prevent localized hyperthermia and damage heater.

Fig. 4 and Fig. 5 are the cabinet heater structure sketch map and the circuit theory sketch mapes of the utility model current transformer, and R1 and R2 are heating tube 7, and TG1, TG2 are the temperature detect switch (TDS) of each temperature shelves value.During heater work, heating tube 7 because of TCU is in an airtight relatively the inside, space, so the heat of heating tube 7 is easy to the just balanced whole cavity the inside that spreads to TCU, just can be realized good heats without blower fan through power supply heating distribute heat.

Claims

1. current transformer that contains heater; It is characterized in that; There are cabinet heater and motion control unit heater in current transformer inside, and wherein the cabinet heater comprises heating circuit, heat-radiation loop and temperature control loop, and heating circuit is perhaps composed in parallel by two resistance series connection; Heat-radiation loop is composed in parallel by two axial flow blowers; The temperature control loop is composed in series by ambient temperature control box, main temperature detect switch (TDS) and all the other four temperature detect switch (TDS)s, temperature control circuit controls heating circuit and heat-radiation loop, and the motion control unit heater is composed in series by power supply, resistance, two temperature detect switch (TDS)s.

2. the current transformer that contains heater according to claim 1 is characterized in that, the temperature control of cabinet heater is in series with fusible link in the loop, is in series with fusible link between the resistance of motion control unit heater and the temperature detect switch (TDS).