CN203643883U - Aftercurrent regulating circuit of aftercurrent operating characteristic testing equipment - Google Patents
Aftercurrent regulating circuit of aftercurrent operating characteristic testing equipment Download PDFInfo
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- CN203643883U CN203643883U CN201320867605.1U CN201320867605U CN203643883U CN 203643883 U CN203643883 U CN 203643883U CN 201320867605 U CN201320867605 U CN 201320867605U CN 203643883 U CN203643883 U CN 203643883U
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 48
- 238000012360 testing method Methods 0.000 title claims abstract description 47
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 230000005669 field effect Effects 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 229910052573 porcelain Inorganic materials 0.000 description 2
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- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
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Abstract
The utility model discloses an aftercurrent regulating circuit of aftercurrent operating characteristic testing equipment. The aftercurrent regulating circuit of the aftercurrent operating characteristic testing equipment is characterized by being composed of a single-phase bridge rectifier circuit, a voltage regulating circuit, a voltage limiting circuit, an output protection circuit, an amplifying circuit and a resistive load circuit. The single bridge rectifier circuit converts 50 Hz and 220 V sine-wave currents required by a test of a testing piece into direct currents. The voltage regulating circuit serves as regulating of a control signal of the amplifying circuit. The voltage limiting circuit serves as the minimum reference voltage of signal input of the voltage regulating circuit. The output protection circuit serves as maximum output protection of the amplifying circuit. The amplifying circuit is used for regulating currents of a direct-current side load resistor. The resistive load circuit is used for regulating aftercurrents. The aftercurrent regulating circuit has the advantages of being simple in structure, reasonable in design, easy to manufacture and wide in I delta (aftercurrents) regulating range. The aftercurrent operating characteristic testing equipment adopting the aftercurrent regulating circuit is small in size, high in reliability and safety, capable of saving energy and protecting the environment and good in popularization value.
Description
Technical Field
The utility model relates to a residual current operating characteristic test equipment especially relates to a residual current regulating circuit of residual current operating characteristic test equipment.
Background
For residual current operating characteristic test equipment conforming to GB16917.1 and GB14048.2 appendix B, the residual current operation regulation of the 'leakage tester' appearing in the domestic industry from 80 s to 'residual current operating characteristic special test equipment' provided by many test equipment manufacturers at present is realized by adopting AC 6V-24V low voltage through fixed resistor grading coarse regulation and high-power potentiometer continuous fine regulation. The scheme has the problems that when the potentiometer is operated for too long, the potentiometer is easy to burn out and only the current of not more than 500mA can be regulated. And a few of the voltage regulators are used for regulating the residual current by firstly fixing the resistor for coarse regulation in a grading way and then regulating the voltage output by using the single-phase voltage regulator. The two residual current regulation schemes do not meet the requirement of a residual current operating characteristic test circuit specified in GB16917.1 and GB14048.2 appendix B. According to the standard, the residual current should be directly adjusted by the phase line to the N line, but for the test sample with I delta N (rated residual current) of 30mA and below 30mA, a high-power porcelain disc rheostat can be adopted for adjustment. However, for a test sample with I delta n reaching 100 mA-500 mA (most of I delta n of a residual current circuit breaker conforming to GB14048.2 appendix B is in the range), the test power of 10I delta n is as high as 1100W, and if a high-power porcelain disc rheostat is adopted for adjustment, the problems of large equipment volume, high manufacturing cost and low reliability and safety exist.
Disclosure of Invention
For solving the problem that above-mentioned special test equipment of residual current operating characteristic exists, the utility model provides a test circuit for improving residual current operating characteristic test equipment's reliability and security uses this test circuit can reduce the volume of equipment, reduces its manufacturing cost.
In order to achieve the purpose, the utility model adopts the following scheme: a residual current regulating circuit of residual current operating characteristic testing equipment is characterized in that: the circuit consists of a single-phase bridge rectifier circuit, a voltage regulating circuit, a voltage limiting circuit, an output protection circuit, an amplifying circuit and a resistive load circuit; wherein,
the single-phase bridge rectifier circuit converts 50Hz and 220V sine wave currents required by a test sample into direct currents, and the input ends of the single-phase bridge rectifier circuit are respectively connected with the wire outlet end of the test sample and the input end of the residual current measuring instrument;
the voltage regulating circuit is used for controlling the control signal of the amplifying circuit, and the input end of the voltage regulating circuit is connected with the output end of the single-phase bridge rectifier circuit;
the voltage limiting circuit is used as the lowest reference voltage of the signal input of the voltage regulating circuit and is connected with the voltage regulating circuit;
the output protection circuit is used for maximum output protection of the amplifying circuit, the input end of the output protection circuit is connected with the voltage regulating circuit, and the output end of the output protection circuit is connected with the signal input end of the amplifying circuit;
the amplifying circuit is used for adjusting the current of the load resistor on the direct current side, and the current input end of the amplifying circuit is connected with the output end of the single-phase bridge rectifier circuit;
and the resistive load circuit is used for adjusting residual current, and the input end of the resistive load circuit is connected with the output end of the amplifying circuit.
As a further explanation of the above technical solution, the single-phase bridge rectifier circuit is composed of a rectifier bridge. The rectifier bridge is a full-wave rectifier circuit consisting of four diodes.
The voltage regulating circuit is a potentiometer. The potentiometer is a potentiometer with the common power of 2W, and a high-power ceramic disc rheostat is not needed, so that the occupied space of an electronic device can be greatly reduced, and the volume of equipment is effectively reduced. Meanwhile, the power consumption of the potentiometer is greatly reduced.
The voltage limiting circuit is a voltage stabilizing diode connected with the potentiometer in series.
The output protection circuit is formed by connecting a current limiting resistor and a voltage stabilizing diode, the input end of the resistor is connected with the output end of the potentiometer, and the other end of the voltage stabilizing diode is connected with the output end of the amplifying circuit.
The amplifying circuit is a field effect transistor.
As an improvement of the above technical solution, the resistive load circuit is a 3-stage load adjusting circuit composed of 3 groups of resistive loads. The load currents corresponding to the 3 groups of resistive loads are respectively 100mA, 500mA and 1000mA, so that the measurement range switching is carried out according to I delta (residual current).
The circuit parameters are properly set, and the residual current can be continuously adjusted from 6mA to 1000 mA.
Therefore, the utility model discloses following advantage: the structure is simple, the design is reasonable, and the manufacture is easy; the I delta (residual current) has a large adjusting range, and the residual current operating characteristic testing equipment adopting the circuit has the advantages of small volume, high reliability and safety, energy conservation, environmental protection and good popularization value.
Drawings
Fig. 1 is a schematic block diagram of a residual current regulating circuit of a residual current operating characteristic testing device.
Fig. 2 is a schematic diagram of the circuit of fig. 1.
The reference numbers illustrate: 1. the device comprises a single-phase bridge rectifier circuit 2, a voltage regulating circuit 3, a voltage limiting circuit 4, an output protection circuit 5, an amplifying circuit 6, a resistive load circuit 7, a graded load regulating circuit 8 and a residual current measuring circuit.
Detailed Description
The present invention and its advantageous technical effects are further described in detail below with reference to the accompanying drawings and preferred embodiments.
Referring to fig. 1, it can be seen that the residual current regulating circuit of the residual current operating characteristic testing device is composed of a single-phase bridge rectifier circuit 1, a voltage regulating circuit 2, a voltage limiting circuit 3, an output protection circuit 4, an amplifying circuit 5 and a resistive load circuit 6; the single-phase bridge rectifier circuit 1 converts 50Hz and 220V sine wave currents required by a test sample into direct currents, and the input ends of the single-phase bridge rectifier circuit are respectively connected with the wire outlet end of the test sample and the input end of a residual current measuring instrument; the voltage regulating circuit 2 is used for controlling the control signal of the amplifying circuit 5, and the input end of the voltage regulating circuit is connected with the output end of the single-phase bridge rectification circuit 1; the voltage limiting circuit 3 is used as the lowest reference voltage of the signal input of the voltage regulating circuit 2, and the voltage limiting circuit 3 is connected with the voltage regulating circuit 2; the output protection circuit 4 is used for maximum output protection of the amplifying circuit 5, the input end of the output protection circuit is connected with the voltage regulating circuit 2, and the output end of the output protection circuit is connected with the signal input end of the amplifying circuit 5; the amplifying circuit 5 is used for adjusting the current of the load resistor on the direct current side, and the current input end of the amplifying circuit is connected with the output end of the single-phase bridge rectifier circuit 1; and the resistive load circuit 6 is used for adjusting residual current, and the input end of the resistive load circuit is connected with the output end of the amplifying circuit 5.
More specific circuit diagram referring to fig. 2, it can be seen that the single-phase bridge rectifier circuit 1 is composed of a rectifier bridge and a discharge protection circuit. The rectifier bridge is a full-wave rectifier circuit formed by four diodes D1-D4, and the discharge protection circuit is a resistor R bridged at the output end of the rectifier bridge.
The voltage regulating circuit 2 is formed by connecting a resistor R2 and a diode D5 in series and is connected with a potentiometer RP in parallel. The voltage limiting circuit 3 is a zener diode ZD1 connected in series with the voltage regulating circuit 2, and a filter capacitor C1 is connected in parallel at two ends of the zener diode ZD 1.
The output protection circuit 4 is composed of a current-limiting resistor R6 and a voltage-stabilizing diode ZD2 which are connected in series, the input end of the resistor R6 is connected with the output end of the potentiometer RP, and the other end of the voltage-stabilizing diode ZD2 is connected with the output end of the amplifying circuit 5. The output end of the current-limiting resistor R6 is connected with a voltage-dividing resistor R5, the other end of the voltage-dividing resistor R5 is connected with the connecting end of the voltage-stabilizing diode ZD1 and the potentiometer RP, and the other end of the voltage-dividing resistor R5 is also provided with a grounding capacitor C2. The amplifier circuit 5 is a field effect transistor IR.
The resistive load circuit 6 is a 3-stage load adjusting circuit consisting of 3 groups of resistive loads RL 1-RL 3 connected in parallel. A changeover switch K1 is provided between the resistive load RL1 and the resistive load RL2, and a changeover switch K2 is provided between the resistive load RL2 and the resistive load RL 3.
By adopting the residual current operating characteristic testing device of the residual current regulating circuit, the residual current can be continuously adjustable from 6mA to 1000 mA. The residual current action test of a test article with the I delta n of 30 mA-500 mA can be met. If 4 groups of fixed resistors, namely the graded load adjusting circuit 7, are connected in parallel before the residual current adjusting circuit, each group of resistors allows the graded adjustment through the test current of 1A, and the test current is used for measuring the action time of 2I delta n-10I delta n, the maximum test current can reach 5A, and the adjusting requirements of 1A-2A, 2A-3A, 3A-4A and 4A-5A can be met. When the potentiometer RP in the voltage regulator circuit 2 is set to the lowest potential output, the output potential of the field effect transistor IR in the amplifier circuit 5 is also the lowest, the current flowing through the resistive loads RL1 to RL3 in the resistive load circuit 6 is the lowest, and the I Δ (residual current) flowing through the test piece is also the lowest. The output potential of the potentiometer RP is adjusted, so that the residual current of the test article can be changed. As the residual current adjusting circuit adopts the amplifying circuit 5 for adjustment, the testing current value meeting the relevant standard can be adjusted at will only by using a potentiometer with the power of 1W-2W.
The invention is not limited to the embodiments disclosed and described above, but rather, modifications and variations of the invention are possible within the scope of the invention as defined in the claims.
Claims (8)
1. A residual current regulating circuit of residual current operating characteristic testing equipment is characterized in that: the circuit consists of a single-phase bridge rectifier circuit, a voltage regulating circuit, a voltage limiting circuit, an output protection circuit, an amplifying circuit and a resistive load circuit; wherein,
the single-phase bridge rectifier circuit converts 50Hz and 220V sine wave currents required by a test sample into direct currents, and the input ends of the single-phase bridge rectifier circuit are respectively connected with the wire outlet end of the test sample and the input end of the residual current measuring instrument;
the voltage regulating circuit is used for controlling the control signal of the amplifying circuit, and the input end of the voltage regulating circuit is connected with the output end of the single-phase bridge rectifier circuit;
the voltage limiting circuit is used as the lowest reference voltage of the signal input of the voltage regulating circuit and is connected with the voltage regulating circuit;
the output protection circuit is used for maximum output protection of the amplifying circuit, the input end of the output protection circuit is connected with the voltage regulating circuit, and the output end of the output protection circuit is connected with the signal input end of the amplifying circuit;
the amplifying circuit is used for adjusting the current of the load resistor on the direct current side, and the current input end of the amplifying circuit is connected with the output end of the single-phase bridge rectifier circuit;
and the resistive load circuit is used for adjusting residual current, and the input end of the resistive load circuit is connected with the output end of the amplifying circuit.
2. A residual current regulating circuit for a residual current operated characteristic testing device according to claim 1, wherein: the single-phase bridge type rectifying circuit is composed of a rectifying bridge.
3. A residual current regulating circuit for a residual current operated characteristic testing device according to claim 2, wherein: the rectifier bridge is a full-wave rectifier circuit consisting of four diodes.
4. A residual current regulation circuit for a residual current operated characteristic testing device according to claim 3, further comprising: the voltage regulating circuit is a potentiometer.
5. A residual current regulation circuit for a residual current operated characteristic testing device according to claim 4, further comprising: the voltage limiting circuit is a voltage stabilizing diode connected with the potentiometer in series.
6. A residual current regulation circuit for a residual current operated characteristic testing device according to claim 5, further comprising: the output protection circuit is formed by connecting a current limiting resistor and a voltage stabilizing diode, the input end of the resistor is connected with the output end of the potentiometer, and the other end of the voltage stabilizing diode is connected with the output end of the amplifying circuit.
7. A residual current regulation circuit for a residual current operated characteristic testing device according to claim 6, further comprising: the amplifying circuit is a field effect transistor.
8. A residual current regulation circuit for a residual current operated characteristic testing device according to claim 6, further comprising: the resistive load circuit is a 3-stage load adjusting circuit consisting of 3 groups of resistive loads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320867605.1U CN203643883U (en) | 2013-12-26 | 2013-12-26 | Aftercurrent regulating circuit of aftercurrent operating characteristic testing equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320867605.1U CN203643883U (en) | 2013-12-26 | 2013-12-26 | Aftercurrent regulating circuit of aftercurrent operating characteristic testing equipment |
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| CN203643883U true CN203643883U (en) | 2014-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320867605.1U Expired - Fee Related CN203643883U (en) | 2013-12-26 | 2013-12-26 | Aftercurrent regulating circuit of aftercurrent operating characteristic testing equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021227128A1 (en) * | 2020-05-09 | 2021-11-18 | 国网湖南省电力有限公司 | Action characteristic test method and test circuit for electric leakage protection action device |
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2013
- 2013-12-26 CN CN201320867605.1U patent/CN203643883U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021227128A1 (en) * | 2020-05-09 | 2021-11-18 | 国网湖南省电力有限公司 | Action characteristic test method and test circuit for electric leakage protection action device |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140611 Termination date: 20171226 |