CN204906241U - De -excitation device of excitation cubicle - Google Patents

Abstract

The utility model discloses a de -excitation device of excitation cubicle increases electric capacity, electric capacity and de -excitation resistance formation resistance -capacitance absorption circuit between the thyristor control utmost point and de -excitation resistance's the one end on the major loop. When motor fall out step and shut down, the resistance -capacitance absorption circuit absorbs the rotor energy and carries out the de -excitation to improve de -excitation reliability and de -excitation speed, reduced de -excitation resistance in operating calorific capacity and fault rate.

Description

The field suppression equipment of excitation cubicle

Technical field

The utility model relates to technical field of motors, is specifically related to a kind of field suppression equipment of excitation cubicle.

Background technology

Excitation cubicle is equipment conventional on generator.Wherein, ball mill synchronous machinery excitation cabinet, because control circuit is complicated, components and parts are many, technical performance is also perfect not, the demagnetization that manufacturer exists excitation cubicle in design controls problem perfect not, causes demagnetization speed slow, and when motor runs, de-excitation resistance long-term fever demagnetization is unsuccessful, thus damage major loop element and motor, there is the phenomenon can not again driven smoothly after the normal excitation unit run stops.

Existing breaking encourages afterflow de-excitation method due to excitation winding system inductive load; when there is zero passage in thyristor operating angle small voltage waveform; just having electric current causes de-excitation resistance to generate heat from de-excitation resistance, the afterflow of controllable silicon loop; during shutdown or step-out time; main circuit power can not stop at once; cause demagnetization unsuccessful, damage major loop element and motor, find the phenomenon that major loop element or control loop damage on inspection.

Utility model content

For the deficiencies in the prior art, the purpose of this utility model is the field suppression equipment providing a kind of excitation cubicle, to improve demagnetization reliability and demagnetization speed, and the situation of the failure rate that reduction de-excitation resistance is in operation and heating.

To achieve these goals, the technical scheme that the utility model is taked is:

A field suppression equipment for excitation cubicle, comprises Hall element, de-excitation resistance, controllable silicon, diode and electric capacity;

Described controllable silicon and described diodes in parallel, negative electrode connects the positive pole of described diode, and anode connects the negative pole of described diode;

Described de-excitation resistance one end is connected with described silicon controlled negative electrode, and one end connects described electric capacity and described Hall element respectively, and the other end of described Hall element connects described silicon controlled anode, and the other end of described electric capacity connects described silicon controlled and controls pole.

Described de-excitation resistance one end is connected with described silicon controlled negative electrode, and one end connects described electric capacity and described Hall element respectively, and the other end of described Hall element connects described silicon controlled anode, and the other end of described electric capacity connects described silicon controlled and controls pole.

Compared with prior art, the beneficial effects of the utility model are:

The field suppression equipment of the utility model excitation cubicle increases electric capacity between SCR control pole and one end of de-excitation resistance on major loop, and electric capacity and de-excitation resistance form resistance-capacitance absorption loop.When motor desynchronizing with when shutting down, resistance-capacitance absorption loop absorbs rotor energy and carries out demagnetization, thus improves demagnetization reliability and demagnetization speed, reduces caloric value and failure rate that de-excitation resistance is in operation.

Accompanying drawing explanation

Fig. 1 is the structural representation of field suppression equipment major loop in prior art;

Fig. 2 is the major loop schematic diagram of the field suppression equipment of the utility model excitation cubicle.

Embodiment

Below in conjunction with embodiment, the utility model is further described.

As shown in Figure 1, dotted portion is demagnetization control circuit to the major loop of the field suppression equipment of existing excitation cubicle, and other components and parts comprise Hall element, controllable silicon KQ, de-excitation resistance RF, diode ZQ.Controllable silicon KQ is in parallel with diode ZQ, controllable silicon KQ negative electrode is connected with diode ZQ positive pole, and anode is connected with diode ZQ negative pole, and de-excitation resistance RF one end is connected with controllable silicon KQ negative electrode, one end is connected with Hall element, and the Hall element other end is connected with controllable silicon KQ anode.

Under foregoing circuit structure, what field suppression equipment adopted is disconnected encourages afterflow de-excitation method, and shortcoming is that demagnetization speed is slow, and de-excitation resistance heating is serious, motor desynchronizing or when shutting down, demagnetization is unsuccessful, damages major loop and control loop element.In order to overcome aforesaid drawbacks, the utility model improves major loop, (conceal demagnetization control loop) as shown in Figure 2, control to increase electric capacity C between pole and de-excitation resistance RF one end at controllable silicon KQ, namely between 8 pin shown in Fig. 1 and 10 pin, electric capacity C is increased, electric capacity C and de-excitation resistance RF forms resistance-capacitance absorption loop, thus capacitance-resistance de-excitation method can be adopted to carry out demagnetization.Specifically, when motor desynchronizing with when shutting down, exciter control system is supplied to controllable silicon KQ pulse in good time, and controllable silicon KQ is turned off, and electric capacity C and resistance RF absorbs remanent magnetism and carries out demagnetization.

Electric capacity C can be one or more, can in parallel or series connection, and total capacitance is preferably 600pf.

Above-listed detailed description is illustrating for the utility model possible embodiments, and this embodiment is also not used to limit the scope of the claims of the present utility model, does not allly depart from the equivalence that the utility model does and implements or change, and all should be contained in the scope of the claims of this case.

Claims (2)

1. a field suppression equipment for excitation cubicle, is characterized in that,

Comprise Hall element, de-excitation resistance, controllable silicon, diode and electric capacity;

Described controllable silicon and described diodes in parallel, negative electrode connects the positive pole of described diode, and anode connects the negative pole of described diode;

Described de-excitation resistance one end is connected with described silicon controlled negative electrode, and one end connects described electric capacity and described Hall element respectively, and the other end of described Hall element connects described silicon controlled anode, and the other end of described electric capacity connects described silicon controlled and controls pole.

2. the field suppression equipment of excitation cubicle according to claim 1, is characterized in that,

The capacitance of described electric capacity is 600pf.