CN105576604A - Electric leakage protection circuit, method, device and system for refrigeration equipment and refrigeration system - Google Patents
Electric leakage protection circuit, method, device and system for refrigeration equipment and refrigeration system Download PDFInfo
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- CN105576604A CN105576604A CN201610088059.XA CN201610088059A CN105576604A CN 105576604 A CN105576604 A CN 105576604A CN 201610088059 A CN201610088059 A CN 201610088059A CN 105576604 A CN105576604 A CN 105576604A
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 118
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000001681 protective effect Effects 0.000 claims description 81
- 238000012545 processing Methods 0.000 claims description 24
- 230000002457 bidirectional effect Effects 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 10
- 230000001276 controlling effect Effects 0.000 description 8
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 101001128814 Pandinus imperator Pandinin-1 Proteins 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/325—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors involving voltage comparison
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Abstract
The invention provides an electric leakage protection circuit, method, device and system for refrigeration equipment and a refrigeration system. The electric leakage protection method for the refrigeration equipment comprises the following steps: obtaining an electric leakage signal, detected by a zero-sequence current transformer, on a line between the refrigeration equipment and power supply equipment; judging whether the value of the electric leakage signal is greater than or equal to a preset value of a comparison signal or not; and controlling the refrigeration equipment to execute shutdown protection operation when judging that the value of the electric leakage signal is greater than or equal to the value of the comparison signal. According to the technical scheme provided by the invention, effective electric leakage protection can be achieved; meanwhile, the cost is relatively low; the reliability is relatively high; and the problem of a relatively large damage to the refrigeration equipment due to the fact that the refrigeration equipment is directly controlled to be powered off when electric leakage is detection in the prior art can be solved.
Description
Technical field
The present invention relates to electric leakage protection technology field; in particular to leakage protection system and a kind of refrigerating system of the earth leakage protective device of the earth leakage protecting method of a kind of leakage protection circuit of refrigeration plant, a kind of refrigeration plant, a kind of refrigeration plant, a kind of refrigeration plant.
Background technology
Along with the raising of people's living standard, air conditioner, electric fan etc. have all obtained extensively universal, in the refrigeration plants such as air-conditioning, the reasons such as unreliable, power line damage are installed because of lack of standardization, the ground wire installed and may cause equipment leakage, the mode of refrigeration plant electric leakage is solved as shown in Figure 1 in current correlation technique, mainly detected between power supply unit and refrigeration plant by leakage switch and whether leak electricity, and when electric leakage being detected, trigger power operation by leakage switch.
But there is following problem in the scheme shown in Fig. 1:
1, the electric leakage signal for small area analysis is insensitive;
2, directly refrigeration plant power-off is triggered because leakage switch detects that electric leakage is rear, very large to the refrigeration plant damage run;
3, the cost of leakage switch is higher, and the reliability of the leakage switch product of existing market is lower.
Summary of the invention
The present invention is intended at least to solve one of technical problem existed in prior art or correlation technique.
For this reason; one object of the present invention is the leakage protective scheme proposing a kind of new refrigeration plant; earth leakage protective effectively can not only be realized; cost is lower simultaneously, reliability is higher, and can avoid directly controlling refrigeration plant power-off in correlation technique when electric leakage being detected and damaging larger problem to refrigeration plant.
Another object of the present invention is to propose a kind of leakage protection circuit of refrigeration plant and a kind of refrigerating system.
For achieving the above object, embodiment according to a first aspect of the invention, proposes a kind of earth leakage protecting method of refrigeration plant, comprising: the electric leakage signal on the circuit between the refrigeration plant that acquisition zero sequence current mutual inductor detects and power supply unit; Judge whether the value of described electric leakage signal is more than or equal to the value of predetermined comparison signal; When judging that the value of described electric leakage signal is more than or equal to the value of described comparison signal, controlling described refrigeration plant and performing stoppage protection operation.
The earth leakage protecting method of refrigeration plant according to an embodiment of the invention, by being detected the electric leakage signal on the circuit between refrigeration plant and power supply unit by zero sequence current mutual inductor, make it possible to electric leakage signal small area analysis being detected, and then earth leakage protective effectively can be realized; Meanwhile, compared to the scheme using leakage switch in correlation technique, the cost of the zero sequence current mutual inductor used in the present invention is lower, and reliability is higher.By when judging that the value of electric leakage signal is more than or equal to the value of predetermined comparison signal; control refrigeration plant and perform stoppage protection operation, make it possible to avoid directly controlling refrigeration plant power-off in correlation technique when electric leakage being detected and damaging larger problem to refrigeration plant.
The earth leakage protecting method of refrigeration plant according to the abovementioned embodiments of the present invention, can also have following technical characteristic:
According to one embodiment of present invention, also comprise: the earth leakage protective value arranged according to user, regulates the load resistance of described zero sequence current mutual inductor.
In this embodiment; when the value of the comparison signal set is fixed; become inverse correlation relation between the earth leakage protective value that user is arranged and the load resistance of zero sequence current mutual inductor, the earth leakage protective value that therefore can arrange according to user regulates the load resistor value of zero sequence current mutual inductor.
According to one embodiment of present invention, the resistance of described load resistance and described earth leakage protective are worth inversely proportional relation.
According to one embodiment of present invention, when judging that the value of described electric leakage signal is more than or equal to the value of described comparison signal, also comprise: display fault message, and/or
By the mode reminding user of sound and/or light.
In this embodiment, showing fault message can be display failure code; By the mode reminding user of sound can be play remind voice; By the mode reminding user of light can be indicator light flicker.
Embodiment according to a second aspect of the present invention, also proposed a kind of earth leakage protective device of refrigeration plant, comprising: acquiring unit, for obtaining the electric leakage signal on the circuit between refrigeration plant and power supply unit that zero sequence current mutual inductor detects; Judging unit, for judging whether the value of described electric leakage signal is more than or equal to the value of predetermined comparison signal; Control unit, for when described judging unit judges that the value of described electric leakage signal is more than or equal to the value of described comparison signal, controls described refrigeration plant and performs stoppage protection operation.
The earth leakage protective device of refrigeration plant according to an embodiment of the invention, by being detected the electric leakage signal on the circuit between refrigeration plant and power supply unit by zero sequence current mutual inductor, make it possible to electric leakage signal small area analysis being detected, and then earth leakage protective effectively can be realized; Meanwhile, compared to the scheme using leakage switch in correlation technique, the cost of the zero sequence current mutual inductor used in the present invention is lower, and reliability is higher.By when judging that the value of electric leakage signal is more than or equal to the value of predetermined comparison signal; control refrigeration plant and perform stoppage protection operation, make it possible to avoid directly controlling refrigeration plant power-off in correlation technique when electric leakage being detected and damaging larger problem to refrigeration plant.
The earth leakage protective device of refrigeration plant according to the abovementioned embodiments of the present invention, can also have following technical characteristic:
According to one embodiment of present invention, also comprise: regulon, for the earth leakage protective value arranged according to user, regulate the load resistance of described zero sequence current mutual inductor.
In this embodiment; when the value of the comparison signal set is fixed; become inverse correlation relation between the earth leakage protective value that user is arranged and the load resistance of zero sequence current mutual inductor, the earth leakage protective value that therefore can arrange according to user regulates the load resistor value of zero sequence current mutual inductor.
According to one embodiment of present invention, the resistance of described load resistance and described earth leakage protective are worth inversely proportional relation.
According to one embodiment of present invention, also comprise:
Display unit, for when described judging unit judges that the value of described electric leakage signal is more than or equal to the value of described comparison signal, display fault message; And/or
Reminding unit, for when described judging unit judges that the value of described electric leakage signal is more than or equal to the value of described comparison signal, by the mode reminding user of sound and/or light.
In this embodiment, showing fault message can be display failure code; By the mode reminding user of sound can be play remind voice; By the mode reminding user of light can be indicator light flicker.
Embodiment according to a third aspect of the present invention, also proposed a kind of leakage protection circuit of refrigeration plant, comprising: zero sequence current mutual inductor, for detecting the electric leakage signal on the circuit between refrigeration plant and power supply unit; Load resistance, the two ends of described load resistance are connected respectively the first output to described zero sequence current mutual inductor and the second output, and the resistance of described load resistance is adjustable; Signal processing circuit, two inputs of described signal processing circuit are connected respectively first end to described load resistance and the second end, described signal processing circuit is used for carrying out current limliting, filtering process to the signal through described load resistance, and the signal after output processing; Earth leakage protective chip; two inputs of described earth leakage protective chip are connected respectively two outputs to described signal processing circuit; when the value of described earth leakage protective chip signal is after the treatment more than or equal to the value of predetermined comparison signal, export earth leakage protective signal by signal output part.
Leakage protection circuit according to an embodiment of the invention; due to when the value of the comparison signal set is fixed; inverse correlation relation is become between the earth leakage protective value that user is arranged and the load resistance of zero sequence current mutual inductor; therefore the resistance by arranging load resistance is adjustable; make when needs change earth leakage protective value; without the need to revising the value of the comparison signal set in earth leakage protective chip, only need to regulate the resistance of load resistance, achieve earth leakage protective value flexible, regulate easily.
Wherein, earth leakage protective chip can be M54123; Load resistance can be single resistive element, and also can be multiple resistive element carries out by the mode of series connection and/or parallel connection the entirety that combines.
According to one embodiment of present invention, described signal processing circuit, comprising: the first electric capacity, and the two ends of described first electric capacity are as two inputs of described signal processing circuit; Bidirectional diode, is connected with described first Capacitance parallel connection; First resistance, the first end of described first resistance is connected to the first end of described bidirectional diode; Second resistance, the first end of described second resistance is connected to the second end of described bidirectional diode; Second electric capacity, the first end of described second electric capacity is connected to the second end of described first resistance, and the second end of described second electric capacity is connected to the second end of described second resistance, and the two ends of described second electric capacity are as two outputs of described signal processing circuit.
Wherein, the first resistance and the second resistance can be single resistive elements, and also can be multiple resistive element carries out by the mode of series connection and/or parallel connection the entirety that combines.
According to one embodiment of present invention, also comprise: the first TVS pipe, described first TVS pipe be connected between the first output of described zero sequence current mutual inductor and ground; Second TVS pipe, described second TVS pipe be connected between the second output of described zero sequence current mutual inductor and ground; And the 3rd TVS pipe, be connected between described first TVS pipe and described second TVS pipe.
In this embodiment, by arranging the first TVS pipe, the second TVS pipe and the 3rd TVS pipe, make it possible to the electrostatic absorbing zero sequence current mutual inductor output.
Embodiment according to a fourth aspect of the present invention, also proposed a kind of leakage protection system of refrigeration plant, comprising: the leakage protection circuit of the refrigeration plant according to any one of above-described embodiment; And the earth leakage protective device of refrigeration plant according to any one of above-described embodiment.
Embodiment according to a fourth aspect of the present invention, also proposed a kind of refrigerating system, comprising: refrigeration plant; Power supply unit, is electrically connected with described refrigeration plant, for powering to described refrigeration plant; And the leakage protection system of refrigeration plant as described in above-described embodiment.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 shows the principle schematic of the leakage protective scheme of correlation technique;
Fig. 2 shows the structural representation of the leakage protection circuit of refrigeration plant according to an embodiment of the invention;
Fig. 3 shows the schematic flow diagram of the earth leakage protecting method of refrigeration plant according to an embodiment of the invention;
Fig. 4 shows the schematic block diagram of the earth leakage protective device of refrigeration plant according to an embodiment of the invention;
Fig. 5 shows the schematic block diagram of the leakage protection system of refrigeration plant according to an embodiment of the invention;
Fig. 6 shows the schematic block diagram of refrigerating system according to an embodiment of the invention;
Fig. 7 shows the structural representation of refrigerating system according to another embodiment of the invention;
Fig. 8 shows the part circuit structure schematic diagram of leakage protection system according to an embodiment of the invention.
Embodiment
In order to more clearly understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, when not conflicting, the feature in the embodiment of the application and embodiment can combine mutually.
Set forth a lot of detail in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from other modes described here and implement, and therefore, protection scope of the present invention is not by the restriction of following public specific embodiment.
Fig. 2 shows the structural representation of the leakage protection circuit of refrigeration plant according to an embodiment of the invention.
As shown in Figure 2, the leakage protection circuit of refrigeration plant according to an embodiment of the invention, comprising: zero sequence current mutual inductor 1, for detecting the electric leakage signal on the circuit between refrigeration plant and power supply unit; Load resistance 2, the two ends of described load resistance 2 are connected respectively the first output to described zero sequence current mutual inductor 1 and the second output, and the resistance of described load resistance 2 is adjustable; Signal processing circuit 3, two inputs of described signal processing circuit 3 are connected respectively first end to described load resistance 2 and the second end, described signal processing circuit 3 is for carrying out current limliting, filtering process to the signal through described load resistance 2, and the signal after output processing; Earth leakage protective chip 4; two inputs of described earth leakage protective chip 4 are connected respectively two outputs to described signal processing circuit 3; when the value of described earth leakage protective chip 4 signal is after the treatment more than or equal to the value of predetermined comparison signal, export earth leakage protective signal by signal output part.
Due to when the value of the comparison signal set is fixed; inverse correlation relation is become between the earth leakage protective value that user is arranged and the load resistance 2 of zero sequence current mutual inductor 1; therefore the resistance by arranging load resistance 2 is adjustable; make when needs change earth leakage protective value; without the need to revising the value of the comparison signal of setting in earth leakage protective chip 4; only need to regulate the resistance of load resistance 2, achieve earth leakage protective value flexible, regulate easily.
Wherein, earth leakage protective chip 4 can be M54123; Load resistance 2 can be single resistive element, and also can be multiple resistive element carries out by the mode of series connection and/or parallel connection the entirety (illustrate only the embodiment that load resistance 2 is two resistive element parallel connections in Fig. 2) that combines.
According to one embodiment of present invention, described signal processing circuit 3, comprising: the first electric capacity 31, and the two ends of described first electric capacity 31 are as two inputs of described signal processing circuit 3; Bidirectional diode 32, is connected in parallel with described first electric capacity 31; First resistance 33, the first end of described first resistance 33 is connected to the first end of described bidirectional diode 32; Second resistance 34, the first end of described second resistance 34 is connected to the second end of described bidirectional diode 32; Second electric capacity 35, the first end of described second electric capacity 35 is connected to the second end of described first resistance 33, second end of described second electric capacity 35 is connected to the second end of described second resistance 34, and the two ends of described second electric capacity 34 are as two outputs of described signal processing circuit 3.
Wherein, first resistance 33 and the second resistance 34 can be single resistive elements, entirety that also can be multiple resistive element be undertaken combining by the mode of series connection and/or parallel connection (illustrate only the embodiment that the first resistance 33 and the second resistance 34 are two resistive element parallel connections in Fig. 2).
According to one embodiment of present invention, also comprise: the first TVS pipe 51, between first output being connected to described zero sequence current mutual inductor 1 of described first TVS pipe 51 and ground; Second TVS pipe 52, between second output being connected to described zero sequence current mutual inductor 1 of described second TVS pipe 52 and ground; And the 3rd TVS pipe 53, be connected between described first TVS pipe 51 and described second TVS pipe 52.
In this embodiment, by arranging the first TVS pipe 51, second TVS pipe 52 and the 3rd TVS pipe 53, make it possible to the electrostatic absorbing zero sequence current mutual inductor 1 output.
Fig. 3 shows the schematic flow diagram of the earth leakage protecting method of refrigeration plant according to an embodiment of the invention.
As shown in Figure 3, the earth leakage protecting method of refrigeration plant according to an embodiment of the invention, comprising:
Step 302, the electric leakage signal on the circuit between the refrigeration plant that acquisition zero sequence current mutual inductor detects and power supply unit;
Step 304, judges whether the value of described electric leakage signal is more than or equal to the value of predetermined comparison signal;
Step 306, when judging that the value of described electric leakage signal is more than or equal to the value of described comparison signal, controlling described refrigeration plant and performing stoppage protection operation.
By being detected the electric leakage signal on the circuit between refrigeration plant and power supply unit by zero sequence current mutual inductor, make it possible to electric leakage signal small area analysis being detected, and then earth leakage protective effectively can be realized; Meanwhile, compared to the scheme using leakage switch in correlation technique, the cost of the zero sequence current mutual inductor used in the present invention is lower, and reliability is higher.By when judging that the value of electric leakage signal is more than or equal to the value of predetermined comparison signal; control refrigeration plant and perform stoppage protection operation, make it possible to avoid directly controlling refrigeration plant power-off in correlation technique when electric leakage being detected and damaging larger problem to refrigeration plant.
The earth leakage protecting method of refrigeration plant according to the abovementioned embodiments of the present invention, can also have following technical characteristic:
According to one embodiment of present invention, also comprise: the earth leakage protective value arranged according to user, regulates the load resistance of described zero sequence current mutual inductor.
In this embodiment; when the value of the comparison signal set is fixed; become inverse correlation relation between the earth leakage protective value that user is arranged and the load resistance of zero sequence current mutual inductor, the earth leakage protective value that therefore can arrange according to user regulates the load resistor value of zero sequence current mutual inductor.
According to one embodiment of present invention, the resistance of described load resistance and described earth leakage protective are worth inversely proportional relation.
According to one embodiment of present invention, when judging that the value of described electric leakage signal is more than or equal to the value of described comparison signal, also comprise: display fault message, and/or
By the mode reminding user of sound and/or light.
In this embodiment, showing fault message can be display failure code; By the mode reminding user of sound can be play remind voice; By the mode reminding user of light can be indicator light flicker.
Fig. 4 shows the schematic block diagram of the earth leakage protective device of refrigeration plant according to an embodiment of the invention.
As shown in Figure 4, the earth leakage protective device 400 of refrigeration plant according to an embodiment of the invention, comprising: acquiring unit 402, judging unit 404 and control unit 406.
Wherein, acquiring unit 402, for obtaining the electric leakage signal on the circuit between refrigeration plant and power supply unit that zero sequence current mutual inductor detects; Judging unit 404, for judging whether the value of described electric leakage signal is more than or equal to the value of predetermined comparison signal; Control unit 406, for when described judging unit 404 judges that the value of described electric leakage signal is more than or equal to the value of described comparison signal, controls described refrigeration plant and performs stoppage protection operation.
By being detected the electric leakage signal on the circuit between refrigeration plant and power supply unit by zero sequence current mutual inductor, make it possible to electric leakage signal small area analysis being detected, and then earth leakage protective effectively can be realized; Meanwhile, compared to the scheme using leakage switch in correlation technique, the cost of the zero sequence current mutual inductor used in the present invention is lower, and reliability is higher.By when judging that the value of electric leakage signal is more than or equal to the value of predetermined comparison signal; control refrigeration plant and perform stoppage protection operation, make it possible to avoid directly controlling refrigeration plant power-off in correlation technique when electric leakage being detected and damaging larger problem to refrigeration plant.
The earth leakage protective device 400 of refrigeration plant according to the abovementioned embodiments of the present invention, can also have following technical characteristic:
According to one embodiment of present invention, also comprise: regulon 408, for the earth leakage protective value arranged according to user, regulate the load resistance of described zero sequence current mutual inductor.
In this embodiment; when the value of the comparison signal set is fixed; become inverse correlation relation between the earth leakage protective value that user is arranged and the load resistance of zero sequence current mutual inductor, the earth leakage protective value that therefore can arrange according to user regulates the load resistor value of zero sequence current mutual inductor.
According to one embodiment of present invention, the resistance of described load resistance and described earth leakage protective are worth inversely proportional relation.
According to one embodiment of present invention, also comprise:
Display unit 410, for when described judging unit 404 judges that the value of described electric leakage signal is more than or equal to the value of described comparison signal, display fault message; And/or
Reminding unit 412, for when described judging unit 404 judges that the value of described electric leakage signal is more than or equal to the value of described comparison signal, by the mode reminding user of sound and/or light.
In this embodiment, showing fault message can be display failure code; By the mode reminding user of sound can be play remind voice; By the mode reminding user of light can be indicator light flicker.
Fig. 5 shows the schematic block diagram of the leakage protection system of refrigeration plant according to an embodiment of the invention.
As shown in Figure 5, the leakage protection system 500 of refrigeration plant according to an embodiment of the invention, comprising: the leakage protection circuit of refrigeration plant as shown in Figure 2; And
The earth leakage protective device 400 of refrigeration plant as shown in Figure 4.
Fig. 6 shows the schematic block diagram of refrigerating system according to an embodiment of the invention.
As shown in Figure 6, refrigerating system 600 according to an embodiment of the invention, comprising: refrigeration plant 602; Power supply unit 604, is electrically connected with described refrigeration plant 602, for powering to described refrigeration plant 602; And the leakage protection system 500 of refrigeration plant as shown in Figure 5.
Fig. 7 shows the structural representation of refrigerating system according to another embodiment of the invention.
As shown in Figure 7; refrigerating system according to another embodiment of the invention; comprise: power supply unit 702; the refrigeration plant 706 be electrically connected with power supply unit; for detecting the zero sequence current mutual inductor 704 of the electric leakage signal of the supply lines between power supply unit 702 and refrigeration plant 706, and earth leakage protective device 708.Wherein, earth leakage protective device 708 can be arranged in refrigeration plant 706.
Particularly, zero sequence current mutual inductor 704 is for detecting the electric leakage signal of live wire and zero line (supply lines namely between power supply unit 702 and refrigeration plant 706), when producing when there being electric leakage signal, zero sequence current mutual inductor 704 just can detect the signal of telecommunication, its secondary coil output signal just can as the input signal of the earth leakage protective chip in earth leakage protective device 708, when RMS (root-mean-square value) value of the leakage current detected is greater than the rated current that earth leakage protective device specifies, earth leakage protective device 708 can produce the operation voltage that pulsewidth is greater than 20ms, just can drive the protective circuit of rear end, to trigger refrigeration plant 706 disorderly closedown, the safety of protection unit, simultaneously, can by LED glimmer reminding user maintenance refrigeration plant 706, or by loudspeaker playing alert tones.
Particularly; be illustrated in figure 8 the part circuit structure schematic diagram of leakage protection system; wherein; terminals subgroup CN83 connects zero sequence current mutual inductor; TVS pipe 30, TVS pipe 31 and TVS pipe 32 are for absorbing electrostatic; resistance R185 and R186 is the load resistance of zero sequence current mutual inductor, and resistance R185 and R186 is adjustable resistor.The leakage current that zero-sequence transformer gathers; be converted to zero-sequence transformer through adjustable resistor R185 and R186 and the magnitude of voltage that leakage current is corresponding detected, after the current limliting formed by C87, D15, R183, R184, R187, R188 and C88, filter circuit, input to earth leakage protective integrated chip M54123.
Particularly, when the leakage current signal that zero sequence current mutual inductor detects, can be corresponding proportional be converted to voltage U, pass through current limliting, earth leakage protective integrated chip M54123 is inputed to after filter circuit, chip M54123 compares the protection voltage U 1 of this voltage U value and setting, if this voltage U is more than or equal to U1, then the OS end of chip M54123 can produce operation voltage, and then generation drive singal, drive singal is by R181 current limliting, drive Q12 conducting, after Q12 conducting, by pin Pin1 outputs level signals, with the protective circuit of triggering following (as controlled refrigeration plant disorderly closedown) and alert circuit.
Wherein, can according to the different requirements of user, complete the design of different earth leakage protective value, correlation computations is as follows:
The resistance of load resistance of setting zero sequence current mutual inductor is Rx, and the minimum value of the residual current protection that user requires is Imin, and the scale parameter of zero sequence current mutual inductor is the representative value of 1000:1, U1 is 5mV, then the computing the resistor value formula of Rx is as follows:
Rx＝(5/Imin)×1000；
Visible, the Imin value that technical scheme of the present invention can require according to user, is carried out the resistance of computational load circuit Rx, and then carrys out the size of regulating load resistance, realize the earth leakage protective in each interval by above-mentioned computing formula.
In sum, the technical scheme of the above embodiment of the present invention can realize following technique effect:
1, real-time monitoring that whether refrigeration plant is leaked electricity and control can be realized;
2, earth leakage protective control precision is high, according to the different requirements of user, can realize different interval earth leakage protective Current Control;
3, the earth leakage protective device that the present invention proposes can be integrated on the circuit board of refrigeration plant, and connect without the need to extra forceful electric power power line, achieve vulnerabilities scan, fail safe is high;
4, in technical scheme of the present invention, after electric leakage being detected, be not allow the direct power-off of refrigeration plant, but be converted into corresponding fault, allow refrigeration plant disorderly closedown, solve at present because the problem of the machinery damage caused is shut down in power-off;
5, compared to the leakage switch used in correlation technique, not only cost is low, wide application for the scheme that the present invention proposes, and reliability is high, and can extend to other equipment and carry out earth leakage protective.
More than be described with reference to the accompanying drawings technical scheme of the present invention; the present invention proposes a kind of leakage protective scheme of new refrigeration plant; earth leakage protective effectively can not only be realized; cost is lower simultaneously, reliability is higher, and can avoid directly controlling refrigeration plant power-off in correlation technique when electric leakage being detected and damaging larger problem to refrigeration plant.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a leakage protection circuit for refrigeration plant, is characterized in that, comprising:
Zero sequence current mutual inductor, for detecting the electric leakage signal on the circuit between refrigeration plant and power supply unit;
Load resistance, the two ends of described load resistance are connected respectively the first output to described zero sequence current mutual inductor and the second output, and the resistance of described load resistance is adjustable;
Signal processing circuit, two inputs of described signal processing circuit are connected respectively first end to described load resistance and the second end, described signal processing circuit is used for carrying out current limliting, filtering process to the signal through described load resistance, and the signal after output processing;
Earth leakage protective chip; two inputs of described earth leakage protective chip are connected respectively two outputs to described signal processing circuit; when the value of described earth leakage protective chip signal is after the treatment more than or equal to the value of predetermined comparison signal, export earth leakage protective signal by signal output part.
2. the leakage protection circuit of refrigeration plant according to claim 1, is characterized in that, described signal processing circuit, comprising:
First electric capacity, the two ends of described first electric capacity are as two inputs of described signal processing circuit;
Bidirectional diode, is connected with described first Capacitance parallel connection;
First resistance, the first end of described first resistance is connected to the first end of described bidirectional diode;
Second resistance, the first end of described second resistance is connected to the second end of described bidirectional diode;
Second electric capacity, the first end of described second electric capacity is connected to the second end of described first resistance, and the second end of described second electric capacity is connected to the second end of described second resistance, and the two ends of described second electric capacity are as two outputs of described signal processing circuit.
3. the leakage protection circuit of refrigeration plant according to claim 1 and 2, is characterized in that, also comprises:
First TVS pipe, described first TVS pipe be connected between the first output of described zero sequence current mutual inductor and ground;
Second TVS pipe, described second TVS pipe be connected between the second output of described zero sequence current mutual inductor and ground; And
3rd TVS pipe, is connected between described first TVS pipe and described second TVS pipe.
4. an earth leakage protecting method for refrigeration plant, is characterized in that, comprising:
Electric leakage signal on circuit between the refrigeration plant that acquisition zero sequence current mutual inductor detects and power supply unit;
Judge whether the value of described electric leakage signal is more than or equal to the value of predetermined comparison signal;
When judging that the value of described electric leakage signal is more than or equal to the value of described comparison signal, controlling described refrigeration plant and performing stoppage protection operation.
5. the earth leakage protecting method of refrigeration plant according to claim 4, is characterized in that, also comprises:
According to the earth leakage protective value that user is arranged, regulate the resistance of the load resistance of described zero sequence current mutual inductor.
6. the earth leakage protecting method of refrigeration plant according to claim 5, is characterized in that, resistance and the described earth leakage protective of described load resistance are worth inversely proportional relation.
7. an earth leakage protective device for refrigeration plant, is characterized in that, comprising:
Acquiring unit, for obtaining the electric leakage signal on the circuit between refrigeration plant and power supply unit that zero sequence current mutual inductor detects;
Judging unit, for judging whether the value of described electric leakage signal is more than or equal to the value of predetermined comparison signal;
Control unit, for when described judging unit judges that the value of described electric leakage signal is more than or equal to the value of described comparison signal, controls described refrigeration plant and performs stoppage protection operation.
8. the earth leakage protective device of refrigeration plant according to claim 7, is characterized in that, also comprises:
Regulon, for the earth leakage protective value arranged according to user, regulates the load resistance of described zero sequence current mutual inductor.
9. the earth leakage protective device of refrigeration plant according to claim 8, is characterized in that, resistance and the described earth leakage protective of described load resistance are worth inversely proportional relation.
10. a leakage protection system for refrigeration plant, is characterized in that, comprising:
The leakage protection circuit of refrigeration plant as claimed any one in claims 1 to 3; And
The earth leakage protective device of the refrigeration plant according to any one of claim 7 to 9.
11. 1 kinds of refrigerating systems, is characterized in that, comprising:
Refrigeration plant;
Power supply unit, is electrically connected with described refrigeration plant, for powering to described refrigeration plant; And
The leakage protection system of refrigeration plant as claimed in claim 10.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610088059.XA CN105576604A (en) | 2016-02-16 | 2016-02-16 | Electric leakage protection circuit, method, device and system for refrigeration equipment and refrigeration system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610088059.XA CN105576604A (en) | 2016-02-16 | 2016-02-16 | Electric leakage protection circuit, method, device and system for refrigeration equipment and refrigeration system |
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Application publication date: 20160511 |