CN204481460U - A kind of new pattern creepage relay protector - Google Patents
A kind of new pattern creepage relay protector Download PDFInfo
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- CN204481460U CN204481460U CN201520135409.4U CN201520135409U CN204481460U CN 204481460 U CN204481460 U CN 204481460U CN 201520135409 U CN201520135409 U CN 201520135409U CN 204481460 U CN204481460 U CN 204481460U
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Abstract
A kind of new pattern creepage relay protector, comprise power supply, electric leakage signal pretreatment module, dsp chip, I/O port and electric leakage signal respond module, power supply is respectively to electric leakage signal pretreatment module, dsp chip, I/O port and electric leakage signal respond module are powered, electric leakage signal pretreatment module detects the leakage current of circuit-under-test, this utility model has low in energy consumption, antijamming capability is strong, broad application temperature range, temperature stability is good, input sensitivity is high, the features such as peripheral cell is few, be applicable to the place that the concentrated areas such as coal preparation plant have a large amount of electronic devices and components, can effectively improve earth leakage protective reliability.
Description
Technical field
The utility model relates to electromagnetism and Digital Signal Processing, specifically be a kind of earth leakage protective device of electric current action type.
Background technology
Current people generally use earth leakage protective device, can only carry out available protecting by offset of sinusoidal ac leakage signal.But along with the development of electronic technology; a large amount of electronic products and frequency conversion equipment are applied; a large amount of harmonic waves is contained in the voltage waveform exported; these harmonic waves can produce earth leakage current by the direct-to-ground capacitance of the direct-to-ground capacitance of motor winding and motor cable line; increase the pulsating direct current electric current of the leakage current in earth leakage protective device institute protective loop; and then the induced potential reduced in common earth leakage protective device zero sequence current mutual inductor and magnetic field intensity; and refused action and the misoperation of earth leakage protective device may be caused, the generation caused the accident.
Various types of earth leakage protective device can only carry out available protecting to corresponding electric leakage signal; in the circuit containing a large amount of electronic equipment and frequency conversion equipment; because containing pulsating direct current signal in electric leakage signal; common earth leakage protective device can not carry out available protecting to circuit; at this moment just should with carrying out reliably protecting to industrial frequency AC signal, the residual current operated protective device that can respond pulsating direct current signal again.
Also clear stipulaties in GB1355-25 " installation and operation of aftercurrent action protecting equipment ", the place more to applying electronic components and parts, can contain pulsating direct current current component during circuit generation leak current fault, should select residual current operated protective device.
Utilize the residual current operated protective device of Digital Signal Processing; can fast and effeciently identify electric leakage signal and process; the utility model adopts dsp chip, realizes the quick response to electric leakage signal, effectively reduces the earth leakage protective device tripping because pulsating direct current signal causes and nonaction.
Utility model content
The utility model carries out perfect for the shortcoming and defect existed in existing earth leakage protective device, provides a kind of electric current action type earth leakage protective device of electronic type.This utility model has low in energy consumption, and antijamming capability is strong, broad application temperature range; the features such as temperature stability is good, and input sensitivity is high, and peripheral cell is few; be applicable to the place that the concentrated areas such as coal preparation plant have a large amount of electronic devices and components, can effectively improve earth leakage protective reliability.
For achieving the above object, the technical solution of the utility model is: a kind of new pattern creepage relay protector, comprise power supply, electric leakage signal pretreatment module, dsp chip, I/O port and electric leakage signal respond module, power supply is respectively to electric leakage signal pretreatment module, dsp chip, I/O port and electric leakage signal respond module are powered, electric leakage signal pretreatment module detects the leakage current of circuit-under-test, the small-signal of leakage current is converted to DC signal output to dsp chip, dsp chip carries out Signal analysis to direct current signal, judge whether direct current signal is electric leakage signal, after being judged to be electric leakage signal, dsp chip sends order of threading off to the release circuit in electric leakage signal respond module by I/O port, release is made to complete trip action, and then the protection realized protective device.
Described power supply is thyristor supply.
Described electric leakage signal respond module also comprises reset circuit.
Described electric leakage signal pretreatment module is made up of zero sequence current mutual inductor, filter circuit, rectification and amplifying circuit, and zero sequence current mutual inductor by after filter circuit, rectification and amplifying circuit, is connected with dsp chip successively.
A kind of new pattern creepage relay protector, comprises power supply, electric leakage signal pretreatment module, dsp chip, I/O port, electric leakage signal respond module.Power supply adopts thyristor supply, provides four output voltages, i.e. 5V, ± 3.3V, 1.8V.Wherein 5V is that electric leakage signal pretreatment module and electric leakage respond module are powered, and ± 3.3V is that the I/O port of DSP chip is powered, and 1.8V is that the kernel of DSP chip is powered.Electric leakage signal pretreatment module comprises zero sequence current mutual inductor, filter circuit, rectification and amplifying circuit composition.Wherein zero sequence current mutual inductor is used to measurement leakage current, and its material adopts permalloy, because permalloy has high magnetic permeability under low-intensity magnetic field, the characteristic of low remanent magnetism and low-coercivity, effectively can improve sensitivity and the linearity of instrument transformer.The signal that zero sequence current mutual inductor is measured is subject to the interference of outer signals, and filter circuit effectively can reduce the signal spectrum aliasing that external interference signal causes, and safeguards the stability that electric leakage signal transmits.Less for electric leakage signal, the distortion phenomenon that common rectification circuit occurs, small-signal is converted to direct current signal by this rectification circuit, effectively prevents the conducting voltage of silicon diode in common rectification circuit (diode rectification) on the impact exported, and has output voltage stabilization, accurate advantage.Electric leakage signal after rectifier circuit rectifies process, then amplifies process through amplifying circuit, obtains the stable direct current signal that magnitude of voltage meets the A/D conversion range of dsp chip.Dsp chip utilizes discrete Fourier algorithm (DFP) to carry out Signal analysis to the direct current signal through amplifying circuit process, determines whether electric leakage signal.After being judged to be electric leakage signal, dsp chip sends order of threading off to the release circuit in electric leakage signal respond module by I/O port, makes release complete trip action, and then realizes the protection to protective device.Also containing reset circuit in electric leakage signal respond module, be used as the homing action of electric leakage relay protector.
Beneficial effect: the utility model is powered by thyristor supply each components and parts to electric leakage relay protector, and have volume little, power supply is stable, the feature that ripple is little and anti-interference and noise immune is strong; Zero sequence current mutual inductor adopts permalloy, makes the measurement of electric leakage signal have more sensitivity and the linearity.Filter circuit and rectification amplifying circuit effectively can remove the interference factor in circuit, filter out useful signal; The utility model adopts dsp chip based on Digital Signal Processing, has that interface is convenient, programming convenience, good stability, computational accuracy is high, arithmetic speed is high and the advantage such as integrated convenience, solves the defects such as conventional earth leakage protector malfunction and movement resistance work; Be specially adapted to the place that the electronic devices and components such as coal preparation plant are concentrated.In addition, the utility model can realize the Rapid reset of electric leakage relay protector, and the utility model considers the timely tripping function of protector when designing in addition, avoids release to burn because of overheated.
Accompanying drawing explanation
Fig. 1 is anatomical connectivity graph of a relation of the present utility model.
Be labeled as in figure: 1, circuit-under-test, 2, electric leakage signal pretreatment module, 3,5V supply line, 4, pretreated direct current signal, 5, dsp chip, 6, calculate after command signal circuit, 7,1.8V supply line, 8, I/O port, 9, reset signal circuit, 10, ± 3.3V supply line, 11, trip signal circuit, 12,5V supply line, 13, reset circuit, 14, release circuit, 15, hand-reset signal circuit, 16, thyristor supply.
Fig. 2 is the circuit diagram of electric leakage signal pretreatment module of the present utility model.
Fig. 3 is release circuit of the present utility model.
Embodiment
As shown in Figure 1, a kind of new pattern creepage relay protector, comprises thyristor supply, electric leakage signal pretreatment module, dsp chip, I/O port, release circuit and reset circuit etc.Wherein, electric leakage signal pretreatment module comprises zero sequence current mutual inductor, filter circuit, rectification circuit and amplifying circuit, and thyristor supply provides the power supply of 5V for it; The material of zero sequence current mutual inductor adopts permalloy, its effect is mainly collection leakage current signal, filter circuit, rectification circuit and amplifying circuit are used for carrying out filtering, rectification and amplification process to electric leakage signal, thus obtain signal stabilization, amplitude electric leakage signal within the specific limits; Wherein, as shown in Figure 2, L1 is zero sequence current mutual inductor, electric capacity C1 and L1 forms resonant circuit, output voltage when lifting leakage current is less, and R1 can transfer the current signal of L1 to voltage signal, D3 and D4 weakens secondary voltage, prevents that voltage is excessive to be damaged circuit.Dsp chip is transferred to through pretreated electric leakage signal, thyristor supply provides 1.8V power supply for it, dsp chip adopts discrete Fourier algorithm (DFP) to carry out the judgement of electric leakage waveform and effective value calculating to electric leakage signal by the program finished writing in advance, and finally judge it whether as electric leakage signal, and send command adapted thereto; The TMS320F28X family chip of TI company is selected in dsp chip suggestion, and this family chip processing speed reaches as high as 150MIPS, and kernel 1.8V, I/O port of powering is powered 3.3V, and has low in energy consumption and that memory capacity is large advantage.Electric leakage signal sends instruction by I/O port to electric leakage signal respond module, and thyristor supply provides 3.3V power supply for I/O port, I/O port act as the interface sending detection signal and control other circuit and element.Trip signal via I/O port sends to the release circuit in electric leakage signal respond module; thyristor supply provides 5V power supply for electric leakage signal respond module; trip signal is cyclic pulse signal; its objective is to prevent release circuit overheated around bad; release pulse signal makes the relay K 1 in Fig. 3 charged; thus adhesive electromagnetic switch, reach the object disconnecting protected circuit.In addition, the reset circuit in electric leakage signal respond module can send reset signal to dsp chip by manual key mode, and then dsp chip sends reset instruction to release circuit, makes the relay K 1 of release circuit reset.
Claims (4)
1. a new pattern creepage relay protector, it is characterized in that: comprise power supply, electric leakage signal pretreatment module, dsp chip, I/O port and electric leakage signal respond module, power supply is respectively to electric leakage signal pretreatment module, dsp chip, I/O port and electric leakage signal respond module are powered, electric leakage signal pretreatment module detects the leakage current of circuit-under-test, the small-signal of leakage current is converted to DC signal output to dsp chip, dsp chip carries out Signal analysis to direct current signal, judge whether direct current signal is electric leakage signal, after being judged to be electric leakage signal, dsp chip sends order of threading off to the release circuit in electric leakage signal respond module by I/O port, release is made to complete trip action, and then the protection realized protective device.
2. a kind of new pattern creepage relay protector as claimed in claim 1, is characterized in that: described power supply is thyristor supply.
3. a kind of new pattern creepage relay protector as claimed in claim 1, is characterized in that: described electric leakage signal respond module also comprises reset circuit.
4. a kind of new pattern creepage relay protector as claimed in claim 1; it is characterized in that: described electric leakage signal pretreatment module is made up of zero sequence current mutual inductor, filter circuit, rectification and amplifying circuit; zero sequence current mutual inductor by after filter circuit, rectification and amplifying circuit, is connected with dsp chip successively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520135409.4U CN204481460U (en) | 2015-03-11 | 2015-03-11 | A kind of new pattern creepage relay protector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520135409.4U CN204481460U (en) | 2015-03-11 | 2015-03-11 | A kind of new pattern creepage relay protector |
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| CN204481460U true CN204481460U (en) | 2015-07-15 |
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| CN201520135409.4U Active CN204481460U (en) | 2015-03-11 | 2015-03-11 | A kind of new pattern creepage relay protector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020103554A1 (en) * | 2018-11-23 | 2020-05-28 | 深圳市晶扬电子有限公司 | Leakage detection integrated circuit chip, leakage detection protection circuit and electrical appliance |
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- 2015-03-11 CN CN201520135409.4U patent/CN204481460U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020103554A1 (en) * | 2018-11-23 | 2020-05-28 | 深圳市晶扬电子有限公司 | Leakage detection integrated circuit chip, leakage detection protection circuit and electrical appliance |
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