CN1045863A - Tester for leakage protector - Google Patents
Tester for leakage protector Download PDFInfo
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- CN1045863A CN1045863A CN 89101675 CN89101675A CN1045863A CN 1045863 A CN1045863 A CN 1045863A CN 89101675 CN89101675 CN 89101675 CN 89101675 A CN89101675 A CN 89101675A CN 1045863 A CN1045863 A CN 1045863A
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
A kind of tester for leakage protector; it is characterized in that comprising the device that the required power supply of test is provided to tested earth leakage protective device; provide unloaded respectively and the resistor network that carries checking earth leakage protective device acting characteristic under the test case is arranged; the leakage current sampling device of taking a sample for leakage current; the converting means that sampled signal is become square wave is linked in one tunnel output of this sampler; the cycle of square wave equals the sampled signal cycle; another road output of described sampler is linked the A/D transducer so that the analog amplitude signal transition is become digital signal; the square-wave signal that this digital signal is exported together with the square wave converting means is delivered to data selector, delivers to display after selecting.
Description
The present invention relates to a kind of measurement type tester for leakage protector.
Present existing tester of the same type both at home and abroad can only be measured the break under electric leakage working value and the impact electric leakage, and the break under the energy measurement closure is leaked electricity; Can only be under zero load and can not carry a checking corresponding action characteristic down having.In addition since tester all to make lightweight portable desk-top, the accuracy of the measurement instrument of selecting for use is lower.More than these all do not meet People's Republic of China's standard " leakage current action type protector " (GB6829-86) in the 8.3rd joint to the requirement of checking acting characteristic defined.In addition, owing to provide the scope of simulation leakage current narrow, the range ratio of measuring leakage current and break is less, and applicable surface is also narrower.
Therefore; the object of the present invention is to provide and a kind ofly can measure electric leakage working value and in all cases at rated residual operating current I; impact electric leakage under the 2I, 5I is with closed electric leakage actuation time and can carry the tester for leakage protector of checking acting characteristic down with having unloaded.
Tester for leakage protector of the present invention comprises supply unit; the sampler that leakage current is taken a sample; the converting means that sampled signal is transformed into square wave is linked in one tunnel output of sampler; the cycle of square wave equals the sampled signal cycle; another road output of sampler is linked the A/D transducer so that the analog amplitude signal transition is become digital signal; the square-wave signal that this digital signal is exported together with the square wave converting means is delivered to data selector, delivers to display after selecting.
The invention has the advantages that the measuring accuracy height, measurement range is big, and the operation letter makes intuitive measurement results or the like.
Below in conjunction with accompanying drawing formation of the present invention and working condition thereof are elaborated.
Fig. 1 is the formation block diagram of tester of the present invention;
Fig. 2 is the electrical schematic diagram of tester of the present invention;
Referring to accompanying drawing 1, X is 220 volts of AC power among the figure, sends into transformer 31, and it produces three groups of accessory power supplys for testing the earth leakage protective device usefulness that needs accessory power supply, and 32 is tested earth leakage protective device.Transformer 33 produces one group of LVPS, and in order to produce the needs of simulation leakage current for test, 34 be resistor network, and inner actual have two covers, and a cover is verified the usefulness of earth leakage protective device acting characteristic by 33 output supply powers when zero load is provided; Another set of by 31 output supply powers, provide the usefulness of checking leakaging action characteristic when carrying.The 35th, the sampling link of leakage current, translation circuit 36 is delivered in its output one tunnel, and it is transformed into a square pulse signal, and its width equals the duration of leakage current; A/D converter 37 is sent on another road, converts leakage current value to digital signal.A/D changes the output signal that 37 devices are also accepted translation circuit 36, so that when measuring the electric leakage working value, when tested earth leakage protective device disjunction, after leakage current disappeared, the measured electric leakage working value data in front were deposited with just further showing in the output register.Electric leakage applicating counter actuation time 38 is measured, and timing signal is produced by crystal oscillator time mark generator 41.The gate-control signal of counter 38 is by the square pulse control of translation circuit 36 outputs.In order to show two data of electric leakage working value and electric leakage actuation time, data selector 39 is set is controlled with a cover display 40.
Referring to accompanying drawing 2, A among the figure, O are 220 volts of ends of incoming cables, deliver to the elementary of transformer B1, and the elementary winding of B1 has three taps, are respectively 187 volts, 220 volts and 242 volts.Output to terminals B and C by waver K, the third gear accessory power supply is provided.B1 secondary has three windings; winding D; E produces voltage U and delivers to the D.C. regulated power supply (not shown); line power for tester; another winding provides voltage U to be used as provides the simulation leakage current when verification is descended in zero load; K switch can be delivered to accessory power supply by the end of incoming cables F and the G of school earth leakage protective device, provides convenience as the household electrical appliance or the earth leakage protective device of accessory power supply with primary power in order to verify some.Neon lamp HD indicates as power supply, shows terminals F When lit, is added with 220 volts of power supplys on the G, and the notices operation person does not go wiring; In order to avoid get an electric shock.K switch has three cutter K, K, and K is in order to preset the unloaded checking characteristic down of still carrying.Carry when verifying characteristic down owing to have, the simulation leakage current need be provided by 220 volts of power supplys, thereby the resistor network of given simulation leakage current will have very big power, particularly need powerful pot that adjustable leakage current is provided, the volume of these devices is very big, and most of occasion is as long as the acting characteristic under the checking zero load is carried the contradiction of characteristic requirement down in order to solve lightweight and portable in volume and to verify to have, adopt two covers that the mechanism of simulation leakage current is provided, one applies mechanically voltage U provides.Resistor network 3 is placed within the tester body, 220 volts of power supplys of another set of usefulness provide, its associated resistor is placed in the additional resistance case, and it links to each other with tester by binding post I, J, and the simulation leakage current is delivered to binding post F or H after by range switch K with the formation loop.The earth leakage protective device that frame of broken lines 1 expression is verified, F, G are its end of incoming cables, and H is a leading-out terminal, and its one group of contact is connected between F and the H.Band load switch K also will cut off accessory power supply, prevent the K maloperation and with the end of incoming cables that accessory power supply is received the examination device, because of the very powerful power supply of when carrying needs is arranged, must provide in addition, rather than the instrument internal power supply can be born.
Functional select switch K has three positions, and 1 is " electric current ", is used for measuring the electric leakage working value; 2 is " setting ", is used to set leakage current for measuring the electric leakage usefulness of actuation time; 3 is " time ", is used to measure actuation time.When measuring the impact electric leakage during actuation time, K makes button usefulness, and when measuring closed electric leakage during actuation time, K makes switch and uses.Designed a special button K for this reason, when pressing and rotating an angle, decontroled then, button no longer ejects, and K has just become switch.
Current transformer output winding B$j＜, 2〉locate and a bridge rectifier Z is arranged, on resistor network, take out the full-wave rectified voltage that its amplitude is proportional to leakage current.Resistor network 5 is in order to finely tune the signal of each range, to keep the accuracy of output signal.In this output voltage one the tunnel after filtration wave network 6 filter into to deliver in 3 A/D converters 7 behind the direct current signal and (use MC14433 in this example).Another road is through delivering to exchangeable gain amplifier 9 to adjust signal amplitude behind the emitter-follower 8.Resistor network 10 cooperates the different ranges of leakage current to change the gain of amplifier 9.Although leakage current changes to several amperes from several milliamperes, the amplitude of amplifier 9 output signals changes little, to adapt to the needs of back circuit.Comparer 11 compares the output signal e and the reference voltage E of variable gain amplifier 9, and it is output as square wave, thereby full wave rectified signal is transformed into square wave.The output square wave e of comparer 11 gets back to low level when AC signal zero crossing, the gap occurred.Diode D and resistance R and capacitor C are formed an one-way latency network to fill and lead up these gaps, signal after filling and leading up is delivered to comparer 12, the reference voltage of comparer 12 is a zero level, and it is output as a square pulse, and its width is approximately equal to the duration of leakage current.The output e of comparer 12 after rising to high level opens counter 13, and counter 13 beginnings are counted by timing pulse.Timing pulse is provided by crystal oscillator time mark generator 17.The 13 output cycles of counter are impulse meter 14 countings of 1ms.The output data of counter 14 is delivered to data selector 16.The current data of A/D converter 7 outputs is modulation formats, and it also delivers to data selector 16, so that current data and actuation time, a shared covering device showed.Data selector 16 makes the data of data selector 16 outputs also modulate by controller 15 controls.It delivers to code translator 18, and light-emitting diode display 19 again puts in place.Darlington OC door 20 is by the modulation signal control of A/D converter 7 outputs, so that make display 19 show corresponding data by turn.
Correctly deposit in order to make electric leakage working value data, design a delay control circuit 21,22,23,24,25, delivered to the output data control end 9 in the A/D converter 7 after it postpones a definite time with the EOC signal Eoc of A/D converter 7 again.If earth leakage protective device disjunction in this deferring procedure; the output signal e of comparer 12 after dropping to low level is cut off this delay chain; this time transformation results is not delivered to output register in the A/D converter 7, thereby what preserve in the register is the disconnected certificate of last complete conversion before the not disjunction.21 and 22 is two d type flip flops among the figure, and 24 is delay networks.23 is 14 2 system counters, and time delay is by counter 23 decisions.25 right and wrong doors, when e was low level, gate circuit 25 was closed, and delay chain is cut off.
The each several part of tester for leakage protector of the present invention is positioned in the box body, and each switch among the figure is located on the panel, and display is located at the remarkable position of panel
Claims (3)
1; a kind of tester for leakage protector; it is characterized in that comprising the device that the required power supply of test is provided to tested earth leakage protective device; provide unloaded respectively and the resistor network that carries checking earth leakage protective device acting characteristic under the test case is arranged; the leakage current sampling device of taking a sample for leakage current; the converting means that sampled signal is become square wave is linked in one tunnel output of this sampler; the cycle of square wave equals the sampled signal cycle; another road output of described sampler is linked the A/D transducer so that the analog amplitude signal transition is become digital signal; the square-wave signal that this digital signal is exported together with the square wave converting means is delivered to data selector, delivers to display after selecting.
2, tester for leakage protector as claimed in claim 1 is characterized in that described square wave converting means contains variable gain amplifier, comparer and one-way latency network.
3, tester for leakage protector as claimed in claim 1; it is characterized in that also comprising one by 14 digit counters, delayer, gating circuit; the delay output control circuit device that d type flip flop constitutes, this circuit arrangement is linked conversion end signal end and output data control end in the A/D converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89101675 CN1045863A (en) | 1989-03-21 | 1989-03-21 | Tester for leakage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89101675 CN1045863A (en) | 1989-03-21 | 1989-03-21 | Tester for leakage protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1045863A true CN1045863A (en) | 1990-10-03 |
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ID=4854385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89101675 Pending CN1045863A (en) | 1989-03-21 | 1989-03-21 | Tester for leakage protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1045863A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1328587C (en) * | 2005-12-27 | 2007-07-25 | 通领科技集团有限公司 | Life-stopping intelligent inspection and inspector for leakage protector |
| CN102062823A (en) * | 2009-11-17 | 2011-05-18 | 张朝 | Electric leakage protection device tester |
| CN103926488A (en) * | 2014-04-04 | 2014-07-16 | 苏州工业职业技术学院 | System for testing electric leakage protector |
| CN111864691A (en) * | 2019-04-30 | 2020-10-30 | 上海复旦微电子集团股份有限公司 | Ground fault protection circuit |
-
1989
- 1989-03-21 CN CN 89101675 patent/CN1045863A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1328587C (en) * | 2005-12-27 | 2007-07-25 | 通领科技集团有限公司 | Life-stopping intelligent inspection and inspector for leakage protector |
| CN102062823A (en) * | 2009-11-17 | 2011-05-18 | 张朝 | Electric leakage protection device tester |
| CN102062823B (en) * | 2009-11-17 | 2013-07-31 | 张朝 | Electric leakage protection device tester |
| CN103926488A (en) * | 2014-04-04 | 2014-07-16 | 苏州工业职业技术学院 | System for testing electric leakage protector |
| CN111864691A (en) * | 2019-04-30 | 2020-10-30 | 上海复旦微电子集团股份有限公司 | Ground fault protection circuit |
| US11705717B2 (en) | 2019-04-30 | 2023-07-18 | Shanghai Fudan Microelectronics Group Company Limited | Ground fault circuit interrupter |
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| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
