CN201860088U - Electricity leakage protector - Google Patents
Electricity leakage protector Download PDFInfo
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- CN201860088U CN201860088U CN2010205652668U CN201020565266U CN201860088U CN 201860088 U CN201860088 U CN 201860088U CN 2010205652668 U CN2010205652668 U CN 2010205652668U CN 201020565266 U CN201020565266 U CN 201020565266U CN 201860088 U CN201860088 U CN 201860088U
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- earth leakage
- residual current
- leakage protective
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Abstract
The utility model relates to an electricity leakage protector comprising a collection unit, an A/D converter, a filter, a calculation unit, a judgment unit and an execution unit, wherein the A/D converter is connected with the collection unit; the filter is connected with the A/D converter; the calculation unit is connected with the filter; the judgment unit is connected with the calculation unit; and the execution unit is connected in a power supply circuit, and is connected with the judgment unit. The embodiment of the utility model has the advantages of more accurately performing electricity leakage protection and monitoring and providing reliability of the normal work of a power supply system on the premise of guaranteeing electric safety.
Description
Technical field
The utility model relates to the electrical safety field, particularly about a kind of earth leakage protective device.
Background technology
Both at home and abroad operating experience for many years shows, promotes the use of earth leakage protective device, to preventing the casualty accident of getting an electric shock, avoids the fire incident that causes because of electric leakage, has a significant effect.
Existing earth leakage protective device (for example zero sequence current mutual inductor) substantially all is to detect residual current, directly relatively judges with thresholding, according to comparative result judgements of leaking electricity, protects purpose personal, device security thereby reach.
The utility model people of the utility model embodiment finds to have following problem in the prior art at least, has contradiction between dynamic range and sensitivity, i.e. the big more earth leakage protective device of rated operational current, and its detection sensitivity is low more.This be because, very low if earth leakage protective thresholding is set, safety is more secure, but the intrinsic electric leakage of system is when weather or environmental change, itself just might cause earth detector generation misoperation above thresholding; If improve the thresholding set point, can reduce the sensitivity of detection of electrical leakage again, omission easily causes personal safety or fire incident.
In addition; existing earth leakage protective device also is very easy to be interfered; misoperation takes place; for example; when the 50/60Hz alternating current is used in the load that is not the pure resistance characteristic; for example various inside comprise the equipment of motor or Switching Power Supply; to cause electric current that certain phase shift takes place when flowing through them; after these situations and the interaction of supply network self complicated topological structure; will on the interchange zero sequence current mutual inductor, show instantaneous current phasor and non-vanishing; especially for the high-frequency carrier signal that high order harmonic component release that produces when the work for some power consumption equipment or surge current and some communication equipment produce; this comprehensive phase shift meeting causes the misoperation (frequent tripping operation) of earth leakage protective device, influences operate as normal.
The utility model content
The utility model embodiment provides a kind of earth leakage protective device, and it is inaccurate to be used for solving prior art earth leakage protective, occurs the problem of misoperation easily.
The utility model embodiment provides a kind of earth leakage protective device, it is characterized in that comprising:
Collecting unit is gathered the residual current signal of zero-sequence transformer output in the current supply circuit;
A/D converter is connected with described collecting unit, is used for described residual current is carried out the conversion of analog to digital;
Filter is connected with described A/D converter, is used for described digital signal of passing through the residual current of conversion is carried out filtering, to eliminate interference signal;
Computing unit is connected with described filter, is used for the output according to filter, calculates the amplification rate of change of described residual current;
Judging unit is connected with described computing unit, is used for then sending the control signal that disconnects current supply circuit if the amplification rate of change of described residual current surpasses first threshold value;
Performance element is connected in the described current supply circuit and with described judging unit and is connected, and is used for disconnecting described current supply circuit according to described control signal.
According to a further aspect of the described method of the utility model embodiment, described computing unit also calculates the effective value of described residual current;
Described judging unit also is used for if the absolute value of described residual current effective value exceeds second threshold value, then sends the control signal that disconnects current supply circuit.
Another further aspect according to the described method of the utility model embodiment also comprises processor and communication unit, and wherein said communication unit is connected with described processor, is used for described processor and remote equipment and communicates; Described processor, the threshold setting order of sending according to remote equipment is provided with first threshold value and second threshold value in the described judging unit, and the control signal of sending according to described remote equipment is controlled described performance element and is carried out power down process.
Another further aspect according to the described method of the utility model embodiment also comprises Tip element, is connected with described processor, is used for to user prompt warning message or video data.
According to another further aspect of the described method of the utility model embodiment, described filter is a low pass filter, only keeps the digital signal of the residual current of 50Hz to 60Hz.
By the utility model embodiment; the scheme of whether cutting off the power supply by the rate of change of judging residual current amplification; can carry out earth leakage protective more accurately; and eliminate high-frequency signal and harmonic component by filter; harmonic wave, the surge current disturbance detection circuit of avoiding electrical appliance to produce cause erroneous judgement; under the prerequisite that guarantees Electrical Safety, also protected carrying out smoothly of operate as normal.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Figure 1 shows that a kind of earth leakage protecting method flow chart of the utility model embodiment;
Figure 2 shows that another flow chart of a kind of electrical leakage detecting method of the utility model embodiment;
Figure 3 shows that the structural representation of the utility model embodiment earth leakage protective device;
Figure 4 shows that another structural representation of the utility model embodiment earth leakage protective device;
Figure 5 shows that a kind of electric leakage supervisory control system structural representation that uses above-mentioned earth leakage protective device of the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
Be illustrated in figure 1 as a kind of earth leakage protecting method flow chart of the utility model embodiment.
Comprise step 101, gather the residual current signal of zero-sequence transformer output in the current supply circuit, wherein said residual current is meant, when accident has taken place for the utensil side of electricity consumption, electric current flows to the earth from electrified body by human body, make big or small unequal mutually and among the I of electric current I in the main circuit turnover line, the instantaneous vector of electric current synthesizes effective value at this moment.
Wherein amplification rate of change (L) is residual current effective value (I in the current sampling period
T) and interior residual current effective value (I of a last sampling period
T-1) difference divided by sampling period (T): L=(I
T-I
T-1)/T.
Pass through the foregoing description, can be by the judgement of residual current amplification rate of change being realized the electric leakage of accurate recognition danger, compartment system electric leakage, and avoided because system's electric leakage that the variation of weather or environment causes surpasses mistake that threshold value the causes phenomenon of cutting off the power supply.
Be illustrated in figure 2 as another flow chart of a kind of electrical leakage detecting method of the utility model embodiment.
Comprise step 201, by the residual current signal on the zero-sequence transformer collection current supply circuit.
Step 202 is carried out the A/D conversion of analog signal to digital signal.
Step 203 is carried out low-pass filtering treatment by finite impulse response (FIR) digital filter, by the signal of telecommunication in the filtering acquisition first frequency scope.For example, 50Hz that reception collects or 60Hz are continuous varying cycles stray currents numerical value, perhaps be the scope between the 50Hz to 60Hz, can eliminate high-frequency signal and harmonic component like this, harmonic wave, the surge current disturbance detection circuit of avoiding electrical appliance to produce cause erroneous judgement.
Step 204 calculates the effective value and the residual current amplification rate of change of residual current.Wherein, the computing formula of residual current effective value:
Wherein, i
nBe the electric current of a certain sampled point, the sum of N sampled point.
Step 205 judges whether residual current is 0, if be not 0 then enter step 206, continues to gather the magnitude of current otherwise return step 201.
Step 206 judges that whether the amplification rate of change of residual current surpasses first threshold value, if surpass then enter step 209, otherwise enters step 207.
Step 207 judges that whether the absolute value of residual current effective value surpasses second threshold value, if surpass then enter step 208, continues to gather the magnitude of current otherwise return step 201.Electric leakage danger may appear in this current supply circuit when the residual current effective value surpasses second threshold value.
Step 208 is sent information, and the prompting user is current dangerous electric leakage may to occur, perhaps sends leakage-current alarm information, may be displayed on and also can adopt buzzer to report to the police on the lcd screen.
Step 209 is cut off current supply circuit and carry out step 208 simultaneously.
Residual current be milliampere level other, the thresholding of amplification rate of change is set as required, for example set the amplification rate of change of residual current according to the load state of the rank of supply line or terminal power consumption equipment, one is a computation of Period with a cycle for described amplification rate of change, and a cycle probably is 20 milliseconds.
As a further embodiment of the present utility model, also comprise the threshold setting order or the control signal that receive remote equipment, set first threshold value and second threshold value of judging unit according to described threshold setting order, and control described performance element according to control command and carry out power down process.
As a further embodiment of the present utility model, also comprise with remote equipment communicating, receive the control command of remote equipment, carry out corresponding operating.The control command that receives for example comprises, sends local residual current data to remote equipment, controls operations such as local earth leakage protective device cuts off the power supply.
As a further embodiment of the present utility model; also comprise the state of pointing out local earth leakage protective device; for example can show whether local residual current belongs to safe condition; perhaps local off-position is owing to the control signal of far-end or because the outage that local result is carried out; by audio frequency or video mode display reminding information; described information can be the flicker of alarm lamp, or the audible alarm of buzzer, perhaps can also be the LCD display status information.
Pass through the foregoing description, by judging residual current amplification rate of change, solved the awkward situation that the emergency exit limit value is provided with in the prior art, can distinguish the situation of dangerous electric leakage and the intrinsic electric leakage of system, eliminate by low-pass filtering simultaneously and disturb, avoid the misoperation of earth leakage protective device, not only guaranteed safety but also protected the useful life of using electric loading; And the transient change of residual current amplification can accurately objectively reflect dangerous electric leakage and the intrinsic electric leakage of system, and not only numerical value is very big for the residual current increment when getting an electric shock generation, and the time dependent speed of its increment is also very fast; Then one is a fixed numbers to the intrinsic electric leakage of system, even along with the change of weather, environmental factor changes, the trend of this variation also is extremely slowly.Although the absolute change amount might be bigger, increment is over time very little, only when amplitude of variation and trend present speeding of given pace or itself have reached bigger numerical, and the dangerous consequences that might cause.By judging that residual current amplification rate of change is distinguished is the intrinsic electric leakage of system that environmental factor causes on earth, or the danger that other reason causes electric leakage, can under the situation that does not reduce detection of electrical leakage sensitivity, have the ability of self study (adaptation) environmental change; And control the control that can realize by far-end to local earth leakage protective device.
Be illustrated in figure 3 as the structural representation of the utility model embodiment earth leakage protective device.
A/D converter 302 is used for described residual current is carried out the conversion of analog to digital.
As a further embodiment of the present utility model, described computing unit 304 also is used to calculate the effective value of described residual current; Described judging unit 305 also is used for if the absolute value of described residual current effective value exceeds second threshold value, then sends the control signal that disconnects current supply circuit.By the foregoing description, by judging residual current amplification rate of change, solved the awkward situation that the emergency exit limit value is provided with in the prior art, and simple in structure, cost is low, to earth leakage protective accuracy height.
Be illustrated in figure 4 as another structural representation of the utility model embodiment earth leakage protective device.
With similar embodiment illustrated in fig. 3, something in common repeats no more in the present embodiment.
Also comprise processor 307, communication unit 308 and memory cell 309 in the present embodiment, wherein said processor is connected with described judging unit 305, performance element 306, memory cell 309 and communication unit 308 respectively, and wherein memory cell 309 is used for storing the residual current data of described judging unit 305; Described processor 307 is used for being provided with according to the threshold setting order that the remote equipment that communication unit 308 receives sends first threshold value and second threshold value of judging unit 305, and the control command that the remote equipment that receives according to communication unit 308 sends is controlled described performance element 306 and carried out power down process; Described communication unit 308 is connected with described processor 307, is used for described processor 307 and communicates with remote equipment.Communication unit can be communicated by letter with remote equipment by power-line carrier communication, also can adopt other wired or radio network technique and remote equipment to communicate.
As a further embodiment of the present utility model, also comprise Tip element 310, be connected with described processor 307, be used for to user prompt warning message or video data.
Wherein, as the described filter 303 of preferred embodiment, computing unit 304, judging unit 305, processor 307, memory cell 309 all is integrated in the system integration, and (System On Chip is SOC) on the chip 311.
This earth leakage protective device can be installed in the equipment such as existing socket, plug, watch-dog or power distribution cabinet.
Be illustrated in figure 5 as a kind of electric leakage supervisory control system structural representation that uses above-mentioned earth leakage protective device of the utility model embodiment.
Comprise that a plurality of as described earth leakage protective device 501 of above-mentioned Fig. 4 is used for the data that control signal is carried out power operation or sent this earth leakage protective device 501 of sending according to monitor terminal 502.Wherein, the data of described earth leakage protective device comprise the signal of telecommunication that collects, and whether the residual current data are in off-position or normal condition.
As a further embodiment of the present utility model, described earth leakage protective device 501 also is used for the via node as other earth leakage protective device, and the data forwarding that is used for other earth leakage protective device is sent is to described monitor terminal 502.
As a further embodiment of the present utility model, also comprise CSRC main frame 503, be connected with a plurality of monitor terminals 502 by network, be used for transmitting control signal, and receive the data that at least one monitor terminal 502 sends at least one monitor terminal 502.Wherein, the data of described monitor terminal 502 transmissions comprise the data that come from a plurality of earth leakage protective devices 501.
It in embodiment as shown in Figure 5 the earth leakage protective supervisory control system of 3-tier architecture; network between wherein said earth leakage protective device 501 and the monitor terminal 502 can be current supply circuit; utilize the communication network technology based on power circuit of the prior art to carry out communication between earth leakage protective device 501 and the monitor terminal 502; and the network between monitor terminal 502 and the CSRC main frame 503 can be for based on the Ethernet of ICP/IP protocol or based on wireless network, thereby carry out mutual communication.
Wherein, each earth leakage protective device all has the communication function of single/complex method, and it not only as the output/input point of data, also can be used as relay point simultaneously; Each earth leakage protective device all is connected by powerline network with the monitor terminal on upper strata and carries out two-way communication and get in touch; to this monitor terminal transmitting real-time data and accept its control, make this monitor terminal become regional center monitor node (to call Centroid in the following text).
When the electric leakage supervisory control system is huger; each regional center node and several earth leakage protective devices that have under its command constitute neural network structure; be that earth leakage protective device or monitor terminal all are the access point and the relay points of data; system be system-wide by dynamic network, that communication can be adopted is non-relay, one-level relaying, secondary relaying, three grades of path forms such as relaying.
Adopt the system of the utility model embodiment, dynamically pass through the current supply circuit load current of earth leakage protective device observing and controlling arbitrary region.According to the scale in observing and controlling zone, in the threshold value of the free setting area of monitor terminals at different levels residual current changes in amplitude rate and residual current absolute value, the calmodulin binding domain CaM alarm is default, finishes regional distribution line digitlization electric leakage monitoring early-warning system.
Above-described embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; institute is understood that; the above only is an embodiment of the present utility model; and be not used in and limit protection range of the present utility model; all within spirit of the present utility model and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (4)
1. earth leakage protective device is characterized in that comprising:
Collecting unit; A/D converter is connected with described collecting unit; Filter is connected with described A/D converter;
Computing unit is connected with described filter; Judging unit is connected with described computing unit; Performance element is connected in the current supply circuit and with described judging unit and is connected.
2. device according to claim 1 is characterized in that, also comprises processor and communication unit, and wherein said communication unit is connected with described processor, is used for described processor and remote equipment and communicates.
3. device according to claim 2 is characterized in that, also comprises Tip element, is connected with described processor.
4. device according to claim 1 is characterized in that, described filter is a low pass filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205652668U CN201860088U (en) | 2010-10-18 | 2010-10-18 | Electricity leakage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205652668U CN201860088U (en) | 2010-10-18 | 2010-10-18 | Electricity leakage protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201860088U true CN201860088U (en) | 2011-06-08 |
Family
ID=44105887
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205652668U Expired - Lifetime CN201860088U (en) | 2010-10-18 | 2010-10-18 | Electricity leakage protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201860088U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109950860A (en) * | 2019-02-26 | 2019-06-28 | 广东珠江开关有限公司 | Detection of electrical leakage judgment method and leakage protection system suitable for low-voltage network |
-
2010
- 2010-10-18 CN CN2010205652668U patent/CN201860088U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109950860A (en) * | 2019-02-26 | 2019-06-28 | 广东珠江开关有限公司 | Detection of electrical leakage judgment method and leakage protection system suitable for low-voltage network |
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| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110608 |
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| CX01 | Expiry of patent term |