CN104280630A - Leakage protection actuation time detection device and testing method - Google Patents
Leakage protection actuation time detection device and testing method Download PDFInfo
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- CN104280630A CN104280630A CN201410464396.5A CN201410464396A CN104280630A CN 104280630 A CN104280630 A CN 104280630A CN 201410464396 A CN201410464396 A CN 201410464396A CN 104280630 A CN104280630 A CN 104280630A
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Abstract
The invention relates to a leakage protection actuation time detection device and a testing method. Certain leakage protectors each comprise a main shut-down switch, a zero sequence current transformer, an electric leakage signal amplifying circuit, a testing device and the like, due to use environments, ageing of components and other factors, the fault that switching-off motions are slow is difficult to avoid, and accordingly unsafe hidden risks are caused if the fault is not eliminated in time. The leakage protection actuation time detection device comprises a main shut-down switch (1), the main shut-down switch is respectively connected with a current transformer (2) and a current-limiting resistor (4), the current transformer is connected with a contact (3), the contact and the current-limiting resistor are respectively connected with a sampling circuit (5), the sampling circuit is connected with a discrimination circuit (6), and the discrimination circuit is connected with a warning circuit (7) and a reset circuit (8). The leakage protection actuation time detection device and the testing method are used for carrying out leakage protection actuation time detection.
Description
technical field:
the present invention relates to a kind of earth leakage protection pick-up unit actuation time and method of testing.
background technology:
existing earth leakage protective device mainly contains the parts such as main disconnect, zero sequence current mutual inductor, electric leakage signal amplifying circuit and test unit and forms.Earth leakage protective device must run stably in a long term; the safety index of its most critical is specified electric leakage T actuation time; namely under specified leakage current effect, the time t of main disconnect disjunction must be less than T, and the T value of most Household electricity leakage protection device is 0.1 second.Earth leakage protective device uses of a specified duration; Due to the factor such as environment for use, component aging; there is the lumbering fault of disjunction unavoidably; although earth leakage protective device is provided with test unit, the time of 0.1 second is with feeling very doubt thus formation hidden danger of can not fixing a breakdown early.
summary of the invention:
the object of this invention is to provide a kind of earth leakage protection pick-up unit actuation time and method of testing.
above-mentioned object is realized by following technical scheme:
a kind of earth leakage protection pick-up unit actuation time; its composition comprises: main disconnect; described main disconnect is connected with current transformer and current-limiting resistance respectively; described current transformer is connected with contact; described contact is connected with sample circuit respectively with current-limiting resistance; described sample circuit is connected with judging circuit, and described judging circuit is connected with circuit of warning, and described judging circuit is connected with reset circuit.
described earth leakage protection pick-up unit actuation time, described earth leakage protection pick-up unit actuation time is additional electric leakage testing circuit actuation time, and described testing circuit actuation time forms primarily of described sample circuit, described judging circuit and described circuit of warning, described current transformer induces leakage current signal and exports to the action of amplifying circuit driving electrical leakage tripping device, described test contact is used for turning on and off analog leakance test loop, described current-limiting resistance determines test simulation leakage current value, described sample circuit is used for analog AC leakage current being converted to DC pulse signal and exports, the time t that the pulse signal that described judging circuit is used for detecting sample circuit output in response to the power supply applied continues, as t < T, output terminal maintains the original state, and output terminal jumps to another state as t>=T, T is the time value set actuation time according to the specified electric leakage of earth leakage protective device, and this state latch is heavily arrived the arrival of reset signal, the power supply that circuit of warning described in 7 applies is used for sending warning signal according to the state of judging circuit saltus step, the moment that described reset circuit is connected can make judging circuit be returned to original state.
described earth leakage protection pick-up unit actuation time, described sample circuit is made up of R2, D5, C4 and photoelectric coupling circuit 9, and described sample circuit is serially connected in analog leakance test loop; Described judging circuit is made up of C2, R3, D3 sum counter integrated package CD4017, and described R3, D3 play latch effect; D4 is the light emitting diode of display fault; Described reset circuit is made up of C3, R5 and reset contact, and described reset contact and test contact are by same push-botton operation; R1, D1, D2 and C1 formation regulator rectifier circuit provides the direct supply needed for testing circuit.
described earth leakage protection pick-up unit actuation time and method of testing, during operation, press test button, described reset contact and described test contact are switched on, C3 provides a spike pulse makes CD4017 reset, test leakage current simultaneously on D5, produce a pulse pressure drop identical with a-c cycle, this voltage drop makes photoelectric coupling circuit switch-on and-off, so form a train of impulses by R2 on the CP end of CD4017; When a-c cycle is 50HZ, the cycle of this train of impulses is 0.02 second, and pulse t=0.02 × n perdurability second, wherein n was umber of pulse; If specified electric leakage T=0.1 actuation time second, the Q5 end then setting CD4017 is output terminal, namely during t > 0.1 second, Q5 exports high level, its error < 20%, the high level that Q5 exports drives light emitting diode D4 conducting of warning, and makes the cpe end saltus step of CD4017 be high level simultaneously thus keeps this state of warning constant until again press test button; As t < 0.1 second, then Q5 end kept low level, and D4 cut-off exports without warning signal, and wait is tested next time.So just achieve the detection of earth leakage protective device electric leakage fault actuation time.
beneficial effect:
1. the invention provides a kind of earth leakage protective device, it can detect the electric leakage of self actuation time in test operation, and the warning signal that is out of order when it exceedes setting, reminding user processes in time.
2. the present invention can make earth leakage protective device ground user accurately judge the fault that its actuation time of leaking electricity is overproof, is convenient to process the electric shock accidents avoiding fault thus to cause in time.
accompanying drawing illustrates:
accompanying drawing 1 is structural representation of the present invention.
accompanying drawing 2 is sample circuit schematic diagram of the present invention.
embodiment:
embodiment 1:
a kind of earth leakage protection pick-up unit actuation time; its composition comprises: main disconnect 1; described main disconnect is connected with current transformer 2 and current-limiting resistance 4 respectively; described current transformer is connected with contact 3; described contact and current-limiting resistance are connected with sample circuit 5 respectively; described sample circuit is connected with judging circuit 6, and described judging circuit is connected with circuit 7 of warning, and described judging circuit is connected with reset circuit 8.
embodiment 2:
earth leakage protection pick-up unit actuation time according to embodiment 1, described earth leakage protection pick-up unit actuation time is additional electric leakage testing circuit actuation time, and described testing circuit actuation time forms primarily of described sample circuit, described judging circuit and described circuit of warning, described current transformer induces leakage current signal and exports to the action of amplifying circuit driving electrical leakage tripping device, described test contact is used for turning on and off analog leakance test loop, described current-limiting resistance determines test simulation leakage current value, described sample circuit is used for analog AC leakage current being converted to DC pulse signal and exports, the time t that the pulse signal that described judging circuit is used for detecting sample circuit output in response to the power supply applied continues, as t < T, output terminal maintains the original state, and output terminal jumps to another state as t>=T, T is the time value set actuation time according to the specified electric leakage of earth leakage protective device, and this state latch is heavily arrived the arrival of reset signal, the power supply that circuit of warning described in 7 applies is used for sending warning signal according to the state of judging circuit saltus step, the moment that described reset circuit is connected can make judging circuit be returned to original state.
embodiment 3:
earth leakage protection pick-up unit actuation time according to embodiment 1 or 2, described sample circuit is made up of R2, D5, C4 and photoelectric coupling circuit 9, and described sample circuit is serially connected in analog leakance test loop; Described judging circuit is made up of C2, R3, D3 sum counter integrated package CD4017, and described R3, D3 play latch effect; D4 is the light emitting diode of display fault; Described reset circuit is made up of C3, R5 and reset contact, and described reset contact and test contact are by same push-botton operation; R1, D1, D2 and C1 formation regulator rectifier circuit provides the direct supply needed for testing circuit.
embodiment 4:
earth leakage protection pick-up unit actuation time according to embodiment 1 or 2 or 3 and method of testing, during operation, press test button, described reset contact and described test contact are switched on, C3 provides a spike pulse makes CD4017 reset, test leakage current simultaneously on D5, produce a pulse pressure drop identical with a-c cycle, this voltage drop makes photoelectric coupling circuit switch-on and-off, so form a train of impulses by R2 on the CP end of CD4017; When a-c cycle is 50HZ, the cycle of this train of impulses is 0.02 second, and pulse t=0.02 × n perdurability second, wherein n was umber of pulse; If specified electric leakage T=0.1 actuation time second, the Q5 end then setting CD4017 is output terminal, namely during t > 0.1 second, Q5 exports high level, its error < 20%, the high level that Q5 exports drives light emitting diode D4 conducting of warning, and makes the cpe end saltus step of CD4017 be high level simultaneously thus keeps this state of warning constant until again press test button; As t < 0.1 second, then Q5 end kept low level, and D4 cut-off exports without warning signal, and wait is tested next time.So just achieve the detection of earth leakage protective device electric leakage fault actuation time.
Claims (4)
1. earth leakage protection pick-up unit actuation time; its composition comprises: main disconnect; it is characterized in that: described main disconnect is connected with current transformer and current-limiting resistance respectively; described current transformer is connected with contact; described contact is connected with sample circuit respectively with current-limiting resistance; described sample circuit is connected with judging circuit, and described judging circuit is connected with circuit of warning, and described judging circuit is connected with reset circuit.
2. earth leakage protection pick-up unit actuation time according to claim 1, it is characterized in that: described earth leakage protection pick-up unit actuation time is additional electric leakage testing circuit actuation time, described testing circuit actuation time forms primarily of described sample circuit, described judging circuit and described circuit of warning, described current transformer induces leakage current signal and exports to the action of amplifying circuit driving electrical leakage tripping device, described test contact is used for turning on and off analog leakance test loop, described current-limiting resistance determines test simulation leakage current value, described sample circuit is used for analog AC leakage current being converted to DC pulse signal and exports, the time t that the pulse signal that described judging circuit is used for detecting sample circuit output in response to the power supply applied continues, as t < T, output terminal maintains the original state, and output terminal jumps to another state as t >=T, T is the time value set actuation time according to the specified electric leakage of earth leakage protective device, and this state latch is heavily arrived the arrival of reset signal, the power supply that circuit of warning described in 7 applies is used for sending warning signal according to the state of judging circuit saltus step, the moment that described reset circuit is connected can make judging circuit be returned to original state.
3. earth leakage protection pick-up unit actuation time according to claim 1 and 2, it is characterized in that: described sample circuit is made up of R2, D5, C4 and photoelectric coupling circuit 9, described sample circuit is serially connected in analog leakance test loop; Described judging circuit is made up of C2, R3, D3 sum counter integrated package CD4017, and described R3, D3 play latch effect; D4 is the light emitting diode of display fault; Described reset circuit is made up of C3, R5 and reset contact, and described reset contact and test contact are by same push-botton operation; R1, D1, D2 and C1 formation regulator rectifier circuit provides the direct supply needed for testing circuit.
4. earth leakage protection pick-up unit actuation time according to claim 1 or 2 or 3 and method of testing, it is characterized in that: during operation, press test button, described reset contact and described test contact are switched on, C3 provides a spike pulse makes CD4017 reset, test leakage current simultaneously on D5, produce a pulse pressure drop identical with a-c cycle, this voltage drop makes photoelectric coupling circuit switch-on and-off, so form a train of impulses by R2 on the CP end of CD4017; When a-c cycle is 50HZ, the cycle of this train of impulses is 0.02 second, and pulse t=0.02 × n perdurability second, wherein n was umber of pulse; If specified electric leakage T=0.1 actuation time second, the Q5 end then setting CD4017 is output terminal, namely during t > 0.1 second, Q5 exports high level, its error < 20%, the high level that Q5 exports drives light emitting diode D4 conducting of warning, and makes the cpe end saltus step of CD4017 be high level simultaneously thus keeps this state of warning constant until again press test button; As t < 0.1 second, then Q5 end kept low level, and D4 cut-off exports without warning signal, waits for and testing next time, to leak electricity the detection of fault actuation time so just achieve earth leakage protective device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410464396.5A CN104280630A (en) | 2014-09-12 | 2014-09-12 | Leakage protection actuation time detection device and testing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410464396.5A CN104280630A (en) | 2014-09-12 | 2014-09-12 | Leakage protection actuation time detection device and testing method |
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| Publication Number | Publication Date |
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| CN104280630A true CN104280630A (en) | 2015-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410464396.5A Withdrawn CN104280630A (en) | 2014-09-12 | 2014-09-12 | Leakage protection actuation time detection device and testing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111537875A (en) * | 2020-06-01 | 2020-08-14 | 泉州睿郎机电技术有限公司 | Method and device for collecting and measuring switching time of double-power-supply change-over switch contact |
-
2014
- 2014-09-12 CN CN201410464396.5A patent/CN104280630A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111537875A (en) * | 2020-06-01 | 2020-08-14 | 泉州睿郎机电技术有限公司 | Method and device for collecting and measuring switching time of double-power-supply change-over switch contact |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20150114 |
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| WW01 | Invention patent application withdrawn after publication |