Establishment and overload protection method of inverse time-limit model for processing time-varying load
An overload protection and inverse time limit technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems that the thermal overload capacity of the motor cannot be fully utilized, affects the continuity of industrial production, and the thermal damage of the motor. Versatility and clear physical effects
Active Publication Date: 2019-04-23
TIANJIN RES INST OF ELECTRIC SCI
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Problems solved by technology
If the overload protection action is advanced, the thermal overload capacity of the motor will not be fully utilized, thereby affecting the continuity of industrial production; if the overload protection action time is delayed, it will easily cause thermal damage to the motor
Method used
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Embodiment Construction
[0033] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.
[0034] A method for establishing an inverse time-limit model for dealing with time-varying loads and an overload protection method, comprising the following steps:
[0035] Step 1. Establish an inverse time-limit model for dealing with time-varying loads.
[0036] In this step, the inverse time limit protection model is as figure 1 shown, where K is the heat dissipation coefficient, T n is the equivalent thermal time constant, T s is the calculation period, the calculation formula of temperature rise θ is:
[0037]
[0038] Among them, P is the heating power, P=I 2 r, r is the load equivalent resistance, the above formula can be equivalently treated as:
[0039]
[0040] Multiply both sides of the above equation
[0041] Tidy up
[0042]
[0043] which is
[0044]
[0045]
[0046]
[0047]
[0048] Finally, the f...
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The invention relates to an establishment and overload protection method of an inverse time-limit model for processing a time-varying load. The establishment and overload protection method comprises the following steps of: establishing the following inverse time-limit model for processing the time-varying load: a formula shown in the description; calculating a heat dissipation coefficient K, an integral constant C, an equivalent thermal time coefficient Tn, t moment load current I and load equivalent resistance r according to an overload protection characteristic value; substituting the K, theC and the Tn into the inverse time-limit model and carrying out the inverse time-limit protection on a motor by utilizing the model. The establishment and overload protection method has a reasonabledesign and the established inverse time-limit model has clear physical significance and can be realized without the need of checking a gauge; the heat dissipation coefficient K and the equivalent thermal time coefficient Tn are only calculated one time, so that the real-time model calculation amount is small, the speed is rapid and DSP (Digital Signal Processor) programming is convenient to realize; the problems that a thermal overload capability of the motor cannot be sufficiently utilized when the overload protection action is carried out in advance or thermal damage of the motor is caused by the overload protection action time being delayed are avoided.
Description
technical field [0001] The invention belongs to the technical field of electrical control, in particular to a method for establishing an inverse time-limit model for processing time-varying loads and overload protection. Background technique [0002] The overload of the motor during operation will cause the internal heat of the motor to gradually accumulate. Long-term overload operation will gradually increase the temperature of the motor, and the insulation material will age faster. In severe cases, the motor will be burned. Therefore, overload protection measures must be taken for the motor. Since the allowable heating time is also changing with the change of the overload multiple of the motor, the motor overload protection must obey the inverse time-lag characteristic, that is, as the overload multiple increases, the protection action time is shorter. [0003] The inverse time overload protection needs to act in real time according to the overload condition of the motor. ...
Claims
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Login to View More IPC IPC(8): H02H7/085
CPCH02H7/085
Inventor 田凯张策杨淦赵金鹏魏维
Owner TIANJIN RES INST OF ELECTRIC SCI