CN103500986A - Low-voltage asynchronous motor protector based on C8051F410 chip - Google Patents

Abstract

The invention discloses a low-voltage asynchronous motor protector based on a C8051F410 chip. The low-voltage asynchronous motor protector based on the C8051F410 chip comprises a low-voltage asynchronous motor, a mutual inductor module, a filter module, a single-chip microcomputer module, an isolation module and an output module. The mutual inductor module is connected with a secondary circuit of the low-voltage asynchronous motor and used for measuring the three-phase current and the three-phase voltage of the motor; output signals of the mutual inductor module are sent to the filter module so that higher harmonic of the three-phase current signal and the three-phase voltage signal which are output by the mutual inductor module can be eliminated, and signals output by the filter module are sent to the isolation module so that a protection algorithm can be achieved; output signals of the C8051F410 chip are sent to the isolation module so that the signals can be isolated from photoelectricity in a field; the signals are sent to the output module, so that a protective relay is driven to operate. The low-voltage asynchronous motor protector based on the C8051F410 chip has the advantages that electric quantity data of each channel are collected rapidly, a positive sequence component and a negative sequence component are extracted through a component filter, a model in overheating protection is analyzed, and therefore corresponding protection is achieved.

Description

A kind of low-voltage induction motor protector based on the C8051F410 chip

Technical field

The present invention relates to the protective device of asynchronous machine, in particular, is a kind of low-voltage induction motor protector based on the C8051F410 chip.

Background technology

How to the effective protection of asynchronous machine implementation and condition monitoring, to be to guarantee production safety and an important problem of efficiently moving.Precision is not high, volume large, can't realize realizing multi-protective function simultaneously because existence is adjusted for conventional electric motor protector based on electric heating, electromagnetic principle and electronic type, and the intelligent electric protector that is had gradually the expanded functions such as good man-machine interaction, communication interface, remote monitoring, linear multi correction and automatic range switching replaces.

The protective device type of existing motor mainly contains two kinds of comprehensive protecting device for motor and intellectual motor protections.The combination that the former is mainly acp chip based on DSP+MCU, this protective device, expensive, mainly for the protection of entirely, require high occasion; And the main protective device based on MCU of the latter; be applicable to the low-tension motor protection occasion of Small And Medium Capacity; only have several functions such as overload, stall and short-circuit protection; the electric current of generally only take is out-of-limit as moving according to not having the functions such as accident analysis and data record; some even can't make clearly judgement to the protection situation, and this safeguards and make troubles to the operations staff.

The new C8051F410 chip speed of releasing can reach 50MIPS, 2304 byte inner data RAM and 32KBFLASH, and 1 SPI interface and hardware real-time clock (SmaRTClock), have 12 ADC of sampling rate 200ksps.Yet, the C8051F410 chip application is but never appeared in the newspapers in the low-voltage induction motor protector.

Summary of the invention

For addressing the above problem; the present invention aims to provide a kind of low-voltage induction motor protector based on the C8051F410 chip, can each passage electric quantity data of Quick Acquisition, and utilize the component filter to extract positive sequence, negative sequence component; and the model of overtemperature protection is analyzed, realize corresponding protection.

A kind of low-voltage induction motor protector based on the C8051F410 chip, comprise low-voltage induction motor, the instrument transformer module, and filtration module, one-chip computer module, isolation module and output module, wherein

The instrument transformer module: comprise current transformer and voltage transformer, described instrument transformer module is connected with the secondary circuit of low-voltage induction motor, for measuring low-voltage induction motor three-phase current and three-phase voltage;

Filtration module: comprise the low pass band stop filter, the output signal of described instrument transformer module is sent into to described filtration module, for the three-phase current of filtering instrument transformer module output and the high order harmonic component of three-phase voltage signal, make described filtration module be output as the first-harmonic of three-phase current and three-phase voltage;

One-chip computer module: described one-chip computer module adopts the C8051F410 chip, the signal of described filtration module output is sent into to the C8051F410 chip, for detection of three-phase current and voltage signal, ask for the effective value of three-phase current and voltage, and extract the positive-negative sequence component, protected the realization of algorithm;

Isolation module: comprise the light-coupled isolation device, the output signal of C8051F410 chip is sent into to isolation module, realize and the isolation of on-the-spot high reject signal photoelectricity;

Output module: the signal after the C8051F410 chip is processed is sent into output module through isolation module, drives the protection relay action.

Advantage of the present invention is: each passage electric quantity data of Quick Acquisition, and utilize the component filter to extract positive sequence, negative sequence component, and the model of overtemperature protection is analyzed, realize corresponding protection.

The accompanying drawing explanation

Fig. 1 is a kind of low-voltage induction motor protector structure sketch based on the C8051F410 chip.

Embodiment

Below in conjunction with drawings and Examples, the present invention is specifically introduced as follows:

A kind of low-voltage induction motor protector based on the C8051F410 chip, comprise low-voltage induction motor, the instrument transformer module, and filtration module, one-chip computer module, isolation module and output module, wherein

The instrument transformer module: comprise current transformer and voltage transformer, described instrument transformer module is connected with the secondary circuit of low-voltage induction motor, for measuring low-voltage induction motor three-phase current and three-phase voltage;

Filtration module: comprise the low pass band stop filter, the output signal of described instrument transformer module is sent into to described filtration module, for the three-phase current of filtering instrument transformer module output and the high order harmonic component of three-phase voltage signal, make described filtration module be output as the first-harmonic of three-phase current and three-phase voltage;

One-chip computer module: described one-chip computer module adopts the C8051F410 chip, the signal of described filtration module output is sent into to the C8051F410 chip, for detection of three-phase current and voltage signal, ask for the effective value of three-phase current and voltage, and extract the positive-negative sequence component, protected the realization of algorithm;

Isolation module: comprise the light-coupled isolation device, the output signal of C8051F410 chip is sent into to isolation module, realize and the isolation of on-the-spot high reject signal photoelectricity;

Output module: the signal after the C8051F410 chip is processed is sent into output module through isolation module, drives the protection relay action.

Below with preferred embodiment, announced the present invention, so it is not intended to limiting the invention, all take to be equal to replace or technical scheme that the form of equivalent transformation obtains, within all dropping on protection scope of the present invention.

Claims (1)

1. the low-voltage induction motor protector based on the C8051F410 chip, comprise low-voltage induction motor, it is characterized in that described low-voltage induction motor protector also comprises:

The instrument transformer module: comprise current transformer and voltage transformer, described instrument transformer module is connected with the secondary circuit of low-voltage induction motor, for measuring low-voltage induction motor three-phase current and three-phase voltage;

Filtration module: comprise the low pass band stop filter, the output signal of described instrument transformer module is sent into to described filtration module, for the three-phase current of filtering instrument transformer module output and the high order harmonic component of three-phase voltage signal, make described filtration module be output as the first-harmonic of three-phase current and three-phase voltage;

One-chip computer module: described one-chip computer module adopts the C8051F410 chip, the signal of described filtration module output is sent into to the C8051F410 chip, for detection of three-phase current and voltage signal, ask for the effective value of three-phase current and voltage, and extract the positive-negative sequence component, protected the realization of algorithm;

Isolation module: comprise the light-coupled isolation device, the output signal of C8051F410 chip is sent into to isolation module, realize and the isolation of on-the-spot high reject signal photoelectricity;

Output module: the signal after the C8051F410 chip is processed is sent into output module through isolation module, drives the protection relay action.

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