CN201733276U

CN201733276U - High-voltage high-power frequency converter with soft excitation debugging function

Info

Publication number: CN201733276U
Application number: CN2010202792337U
Authority: CN
Inventors: 唐毅; 董凌云; 张荣东
Original assignee: Dongfang Hitachi Chengdu Electric Control Equipment Co Ltd
Current assignee: Dongfang Hitachi Chengdu Electric Control Equipment Co Ltd
Priority date: 2010-08-03
Filing date: 2010-08-03
Publication date: 2011-02-02
Anticipated expiration: 2020-08-03

Abstract

The utility model discloses a high-voltage high-power frequency converter with a soft excitation debugging function. The frequency converter mainly comprises a high-voltage circuit breaker QF, a debugged phase shifting transformer T1 and a power unit connected with the debugged phase shifting transformer T1 and is characterized in that: a soft excitation debugging device is connected between the wire outlet side of the high-voltage circuit breaker QF and the high-voltage side of the debugged phase shifting transformer T1. A set of soft excitation debugging device is arranged based on an original frequency converter, so that soft excitation control can be realized and overvoltage and inrush current generated by the transformer during high-voltage debugging of the frequency converter are reduced. Therefore, safety and reliability of a high voltage debugging process are guaranteed.

Description

High-voltage high-power frequency transformator with soft excitation debug function

Technical field

The utility model relates to a kind of frequency converter, specifically is meant a kind of high-voltage high-power frequency transformator with soft excitation debug function.

Background technology

Frequency converter has purposes widely at industrial control field, high-voltage high-power frequency transformator, industrial especially to heavy-duty motor control, the visual plant of speed governing and soft start.For the high voltage converter of operating voltage more than 3kV, be subjected to the influence of device withstand voltage and Power Limitation, the general version that adopts a plurality of power cell branches to be in series to satisfy the requirement of high pressure output, adopts the high voltage converter of this version then to be called the tandem type high voltage converter.

At present; it is less to be used in the factory distribution capacity of commissioning device; according to the normal running flow process; if directly drop into the primary power source of large-capacity transducer (tested frequency converter); when then closing a floodgate owing to high-voltage switch gear; the excessive magnetizing inrush current of phase shifting transformer will cause breaker protection action of high voltage power distribution chamber or fuse blows, thereby can bring unnecessary trouble to debugging, and then has a strong impact on progress and the waste great amount of manpower and the material resources of debugging.

The utility model content

The purpose of this utility model is to overcome at present when high-voltage switch gear closes a floodgate; the excessive magnetizing inrush current of phase shifting transformer can cause the defective of breaker protection action of high voltage power distribution chamber or fuse blows; provide a kind of and can effectively prevent when high-voltage switch gear closes a floodgate, the high-voltage high-power frequency transformator that this high voltage power distribution chamber circuit breaker does not protect action or fuse not to fuse with soft excitation debug function.

The purpose of this utility model is achieved through the following technical solutions: the high-voltage high-power frequency transformator with soft excitation debug function, mainly is made up of primary cut-out QF, debugged phase shifting transformer T1 and the power cell that is connected with this debugged phase shifting transformer T1, the while is connected with the soft excitation debugging apparatus between the high-pressure side of the outlet side of primary cut-out QF and debugged phase shifting transformer T1.

Further, described soft excitation debugging apparatus is by logic controller PLC, low-voltage circuit breaker QF8, the contactor KM20 and the contactor KM21 that are connected with this logic controller PLC, and the resistance R 1 that is connected in series successively with low-voltage circuit breaker QF8, resistance R 2 and debugging transformer T2 constitute; The normally opened contact of described contactor KM21 is connected in the two ends of resistance R 1, and the normally opened contact of contactor KM20 is serially connected with between resistance R 2 and the debugging transformer T2; The high-pressure side of described debugging transformer T2 then is connected in the outlet side of primary cut-out QF and the high-pressure side of debugged transformer T1.

In order better to realize the utility model, described resistance R 1 and resistance R 2 are resistant to elevated temperatures high-power resistance, and described debugging transformer T2 to be the high-pressure side have that three kinds of electric pressures, low-pressure sides have the step-up transformer that phase sequence is adjusted function, wherein these on high-tension side three kinds of electric pressures are 3kV, 6kV and 10kV.

Simultaneously, the high-pressure side of described debugging transformer T2 is corresponding one by one with the voltage-phase of primary cut-out QF.

The utility model compared with prior art has following advantage and beneficial effect:

(1) the utility model has increased by a cover soft excitation debugging apparatus on the basis of original frequency converter, therefore can realize soft excitation control, the overvoltage that transformer produces when reducing the debugging of frequency converter high pressure and shoving, thus guarantee the safe and reliable of high pressure debug process.

(2) not only cost of manufacture is comparatively cheap for the utility model, and reliability is very high.

Description of drawings

Fig. 1 is the syndeton schematic diagram of existing high voltage converter.

Fig. 2 is an overall structure schematic diagram of the present utility model.

Embodiment

The utility model is described in further detail below in conjunction with embodiment, but execution mode of the present utility model is not limited thereto.

Embodiment

As shown in Figure 1, the end of incoming cables of the primary cut-out QF of existing high-voltage high-power frequency transformator directly is connected with factory inner high voltage power supply, and its leading-out terminal then is connected with the high-pressure side of debugged phase shifting transformer T1.The low-pressure side of this debugged phase shifting transformer T1 then directly is connected with power cell, so that power to power cell by this debugged phase shifting transformer T1.Simultaneously, this power cell also is connected with high-voltage asynchronous motor I M.

As shown in Figure 2, the utility model has increased by a cover soft excitation debugging apparatus on the basis of original frequency converter.

Described soft excitation debugging apparatus is made of low-voltage circuit breaker QF8, resistance R 1, resistance R 2, debugging transformer T2 and control section.Described control section comprises logic controller PLC, contactor KM20 and contactor KM21, wherein, this logic controller PLC is connected with the AC power of outside 220V, the coil of contactor KM20 and contactor KM21 then is connected with this logic controller PLC, so that come energising and the outage of control contactor KM20 and contactor KM21 by this logic controller PLC.

In order to ensure result of use, the resistant to elevated temperatures high-power resistance of all preferential employing of this resistance R 1 and resistance R 2, debugging transformer T2 then adopts step-up transformer, and its high-pressure side has 3kV, 6kV and these three kinds of electric pressures of 10kV, and its low-pressure side has phase sequence and adjusts function.

During connection, the end of incoming cables of described low-voltage circuit breaker QF8 is connected with the soft excitation power supply of outside 380V, and its leading-out terminal then is connected in series with resistance R 1 and resistance R 2 successively mutually.Simultaneously, the normally opened contact of described contactor KM21 also is in parallel with resistance R 1, and promptly the two ends of the normally opened contact of this contactor KM21 are connected to the two ends of resistance R 1 respectively, so that as required this resistance R 1 is carried out short circuit.

The low-pressure side of described debugging transformer T2 then is connected in series with resistance R 2 behind the normally opened contact of contactor KM20 mutually, thereby makes normally opened contact and the debugging transformer T2 series connection mutually successively of low-voltage circuit breaker QF8, resistance R 1, resistance R 2, contactor KM20.Simultaneously, the high-pressure side of debugging transformer T2 then is connected with the outlet side of primary cut-out QF and the high-pressure side of debugged phase shifting transformer T1 respectively, the high-pressure side of promptly debugging transformer T2 is connected with the high-pressure side of debugged phase shifting transformer T1, simultaneously, also the voltage-phase with primary cut-out QF is corresponding one by one in the high-pressure side of described debugging transformer T2.The low-pressure side of debugged phase shifting transformer then is connected with high-voltage asynchronous motor I M behind power cell.

As mentioned above, just can well realize the utility model.

Claims

1. the high-voltage high-power frequency transformator that has the soft excitation debug function, mainly form, it is characterized in that: between the high-pressure side of the outlet side of primary cut-out QF and debugged phase shifting transformer T1, be connected with the soft excitation debugging apparatus by primary cut-out QF, debugged phase shifting transformer T1 and the power cell that is connected with this debugged phase shifting transformer T1.

2. the high-voltage high-power frequency transformator with soft excitation debug function according to claim 1, it is characterized in that: described soft excitation debugging apparatus is by logic controller PLC, low-voltage circuit breaker QF8, the contactor KM20 and the contactor KM21 that are connected with this logic controller PLC, and the resistance R 1 that is connected in series successively with low-voltage circuit breaker QF8, resistance R 2 and debugging transformer T2 constitute; The normally opened contact of described contactor KM21 is connected in the two ends of resistance R 1, and the normally opened contact of contactor KM20 is serially connected with between resistance R 2 and the debugging transformer T2; The high-pressure side of described debugging transformer T2 then is connected in the outlet side of primary cut-out QF and the high-pressure side of debugged transformer T1.

3. the high-voltage high-power frequency transformator with soft excitation debug function according to claim 2 is characterized in that: described resistance R 1 and resistance R 2 are resistant to elevated temperatures high-power resistance.

4. according to claim 2 or 3 described high-voltage high-power frequency transformators with soft excitation debug function, it is characterized in that: described debugging transformer T2 is that the high-pressure side has the step-up transformer that three kinds of electric pressures, low-pressure sides have phase sequence adjustment function.

5. the high-voltage high-power frequency transformator with soft excitation debug function according to claim 4 is characterized in that: the high-pressure side of described debugging transformer T2 is corresponding one by one with the voltage-phase of primary cut-out QF.

6. the high-voltage high-power frequency transformator with soft excitation debug function according to claim 5 is characterized in that: the on high-tension side electric pressure of described debugging transformer T2 is 3kV, 6kV and 10kV.