CN105322503A - Integrated leakage relay - Google Patents
Integrated leakage relay Download PDFInfo
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- CN105322503A CN105322503A CN201410351783.8A CN201410351783A CN105322503A CN 105322503 A CN105322503 A CN 105322503A CN 201410351783 A CN201410351783 A CN 201410351783A CN 105322503 A CN105322503 A CN 105322503A
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Abstract
The invention discloses an integrated leakage relay used for solving the problem that a leakage relay in the prior art is not sensitive in motions under low leakage current. The relay comprises a capacitance-resistance voltage drop power supply, and a zero sequence current transformer, a signal detection amplification circuit, a rectifier circuit, a comparison unit, a return difference locking and motion delay circuit and a motion execution circuit electrically connected in sequence; the capacitance-resistance voltage drop power supply is respectively connected with the signal detection amplification circuit, the rectifier circuit, the comparison unit and the motion execution circuit; the capacitance-resistance voltage drop power supply provides needed DC current for circuits of various levels; the signal detection amplification circuit is used for amplifying detected current so as to shape and compare succeeding circuits; the rectifier circuit is used for determining sizes of leakage signal values; then the motion execution circuit is used for driving the inner relay to carry out a switch-off motion. The integrated leakage relay uses the signal detection amplification circuit and the capacitance-resistance voltage drop technology to realize leakage detection and motion functions of the relay, and is sensitive and reliable in motions.
Description
Technical field
The electric break-make control field of the present invention, is specifically related to one and is active in one's movements, zero-sequence transformer and relay assembly all-in-one-piece leakage relay.
Background technology
Leakage relay is a kind of protective device that can cut off protected circuit power supply after protected circuit leakage current reaches set point.Existing leakage relay volume is little; easy to install; operate simple and easy; reliable in action; continuous power supply is stablized; can be used for carrying out earth fault protection to circuit, prevent the equipment breakdown because earth fault current causes or electrical fire, also can be used to remove human electric shock provide indirect contact to protect.Leakage relay plays very important effect in electric power system, is the basis ensureing power supply reliability.And when electric leakage or the fault such as short circuit occur equipment and equipment residue leakage current is less, do not reach the operating current value of leakage relay, relay attonity, circuit shut-down action is insensitive.
Summary of the invention
In order to solve the defect that above-mentioned technology exists, the invention provides one and being active in one's movements, zero-sequence transformer and relay assembly all-in-one-piece leakage relay.
The present invention realizes the technical scheme that above-mentioned technique effect adopts:
A kind of integral type leakage relay, comprise resistance-capacitance depressurization power supply and the zero sequence current mutual inductor be electrically connected successively, signal detection amplifying circuit, rectification circuit, comparing unit, return difference locking and action delay circuit and action executing circuit, resistance-capacitance depressurization power supply respectively connection signal detects amplifying circuit, rectification circuit, comparing unit and action executing circuit, described zero-sequence transformer and relay assembly integral.
Above-mentioned a kind of integral type leakage relay, zero sequence current mutual inductor is parallel with the first relay K 1, zero sequence current mutual inductor one end ground connection, other end series resistance and electric capacity access signal detection amplifying circuit, described signal detection amplifying circuit comprises the signal deteching circuit and signal amplification circuit that are electrically connected successively.
Above-mentioned a kind of integral type leakage relay, described zero sequence current mutual inductor is also parallel with electric capacity C1, diode D4 and diode D5 successively at the upstream extremity of the first relay K 1.
Above-mentioned a kind of integral type leakage relay, described signal amplification circuit connects an experimental circuit, described experimental circuit comprises three terminal regulator U3B, be connected with divider resistance between the input of three terminal regulator U3B and resistance-capacitance depressurization power supply, between the output of three terminal regulator U3B and signal amplification circuit, be connected with diode D10.
Above-mentioned a kind of integral type leakage relay, described signal amplification circuit comprises three terminal regulator U3C, the output access rectification circuit of three terminal regulator U3C, the output that described rectification circuit comprises three terminal regulator U3A in parallel and three terminal regulator U3D, three terminal regulator U3A and three terminal regulator U3D is connected rectifier diode D2 and rectifier diode D6 respectively.
Above-mentioned a kind of integral type leakage relay, the negative pole of the rectifier diode D2 in described rectification circuit is connected with the negative pole of rectifier diode D6 and accesses comparing unit, then by comparing unit access return difference locking and action delay circuit.
Above-mentioned a kind of integral type leakage relay, described return difference locking and action delay circuit comprise three terminal regulator U2A, and the output of three terminal regulator U2A is connected with the second relay K 2, second relay K 2 other end access action executing circuit.
Above-mentioned a kind of integral type leakage relay, described action executing circuit comprises three terminal regulator U2B, the input of three terminal regulator U2B is connected to the second relay K 2, and the input of three terminal regulator U2B is connected with transistor Q2, and the collector electrode of transistor Q2 is connected with the 3rd relay K 3.
Beneficial effect of the present invention is: resistance-capacitance depressurization power supply no power supply transformer of the present invention; structure is simple; have the advantages that volume is little, lightweight, with low cost, dynamic response is fast, reliable and stable; return difference locking and action delay circuit can effectively stability contorting residual current action relay actions; and according to system requirements delayed alarm; the comparing unit control relay break-make that action executing circuit is built by operational amplifier and then cut off protected circuit, is active in one's movements reliable.Adopt the current amplification unit of particular design, employing signal detection amplifying circuit, resistance-capacitance depressurization technology realize detection of electrical leakage and the holding function of leakage relay.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention;
Fig. 2 a is a part for schematic block circuit diagram of the present invention;
Fig. 2 b is another part of schematic block circuit diagram of the present invention;
Fig. 3 is the circuit diagram of resistance-capacitance depressurization power supply of the present invention;
Fig. 4 is the circuit diagram of signal deteching circuit of the present invention;
Fig. 5 is the circuit diagram of signal amplification circuit of the present invention;
Fig. 6 is the circuit diagram of rectification circuit of the present invention;
Fig. 7 is the circuit diagram of return difference of the present invention locking and action delay circuit;
Fig. 8 is the circuit diagram of action executing circuit of the present invention;
Fig. 9 is the circuit diagram of experimental circuit of the present invention.
In figure: the locking of 1-signal detection amplifying circuit, 2-rectification circuit, 3-resistance-capacitance depressurization power supply, 4-return difference and action delay circuit, 5-action executing circuit, 6-experimental circuit, 11-signal deteching circuit, 12-signal amplification circuit.
Embodiment
For making to do further understanding to the present invention, referring to Figure of description and specific embodiment, the invention will be further described:
As shown in Figure 1 to 9, a kind of integral type leakage relay, comprises resistance-capacitance depressurization power supply 3 and the zero sequence current mutual inductor L1 be electrically connected successively, signal detection amplifying circuit 1, rectification circuit 2, comparing unit, return difference locking and action delay circuit 4 and action executing circuit 5.Each branch relay assembly that resistance-capacitance depressurization power supply 3 difference connection signal detects in amplifying circuit 1, rectification circuit 2, comparing unit and action executing circuit 5, zero-sequence transformer L1 and the present invention is integral.Resistance-capacitance depressurization power supply 3 is respectively direct current that signal detection amplifying circuit 1, rectification circuit 2, return difference locking and action delay circuit 4 and action executing circuit 5 provide its needs of institute, the power access end access 220V electric main of resistance-capacitance depressurization power supply 3, step-down is carried out by components and parts such as the diode in circuit, electric capacity and resistance, no power supply transformer in circuit, structure is very simple, has that volume is little, lightweight, with low cost, dynamic response is fast, reliable and stable.Zero sequence current mutual inductor L1 is parallel with the first relay K 1, zero sequence current mutual inductor L1 one end ground connection, other end series resistance and electric capacity access signal detection amplifying circuit 1, described signal detection amplifying circuit 1 comprises the signal deteching circuit 11 and signal amplification circuit 12 that are electrically connected successively.Whole circuit theory diagrams are made up of the part shown in the part shown in Fig. 2 a and Fig. 2 b, A point line in Fig. 2 a is connected with the A point line in Fig. 2 b, signal deteching circuit 11 detects the residual current in its primary side by zero sequence current mutual inductor L1, and convert voltage signal to, by switching over gear.Signal amplification circuit 12 is amplified the signal detected by operational amplifier, then sends into late-class circuit and carries out shaping and compare.Rectification circuit 2 changes variable AC signal into stable direct current signal, and judges the size of electric leakage signal value, then drives internal relay to perform by action executing circuit 5 and turns off action.
Concrete, in a preferred embodiment of the invention, zero sequence current mutual inductor L1 is also parallel with electric capacity C1, diode D4 and diode D5 successively at the upstream extremity of the first relay K 1.Whether for residual current occurs in simulation, simply to detect aftercurrent action protecting equipment effective; signal amplification circuit 12 is connected with an experimental circuit 6; this experimental circuit 6 comprises three terminal regulator U3B; divider resistance is connected with between the input of three terminal regulator U3B and resistance-capacitance depressurization power supply; diode D10 is connected with, pin 5 ground connection of three terminal regulator U3B between the output of three terminal regulator U3B and signal amplification circuit.Signal amplification circuit 12 comprises three terminal regulator U3C, the output access rectification circuit 2 of three terminal regulator U3C, the output that rectification circuit 2 comprises three terminal regulator U3A in parallel and three terminal regulator U3D, three terminal regulator U3A and three terminal regulator U3D is connected rectifier diode D2 and rectifier diode D6 respectively.The negative pole of the rectifier diode D2 in rectification circuit 2 is connected with the negative pole of rectifier diode D6 and accesses comparing unit, and comparing unit is the comparison circuit that operational amplifier is formed.Then rectification circuit 2 is by comparing unit access return difference locking and action delay circuit 4, and return difference locking and action delay circuit 4 can the actions of more effective stability contorting residual current action relay, and according to system requirements delayed alarm.Return difference locking and action delay circuit 4 comprise three terminal regulator U2A, and the output of three terminal regulator U2A is connected with the second relay K 2, second relay K 2 other end access action executing circuit 5.Action executing circuit 5 comprises three terminal regulator U2B, and the input of three terminal regulator U2B is connected to the second relay K 2, and the input of three terminal regulator U2B is connected with transistor Q2, and the collector electrode of transistor Q2 is connected with the 3rd relay K 3.This integral type leakage relay is by detecting protected electric equipment residue leakage current size as the signal sending action tripping operation, and the protective device of execution tripping operation task.In the low-voltage equipment of installing integral type earth leakage protective device, under normal circumstances, equipment residue leakage current is less, and do not reach the operating current value of leakage relay, therefore earth leakage protective device is failure to actuate.After there is the faults such as electric leakage or short circuit in protected equipment; when reaching its residual operating current value by the electric current of leakage relay detecting element; then will there is action tripping operation in leakage relay; the main circuit switch action tripping operation making it control; cut off the electricity supply, thus complete earth leakage protective task.Integral type leakage relay is widely used in the places such as power plant, industrial and mining enterprises, colliery, mansion.
More than show and describe general principle of the present invention, principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; the just principle of the present invention described in above-described embodiment and specification; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention; these changes and improvements all fall in claimed scope of the present invention, and the protection range of application claims is defined by appending claims and equivalent thereof.
Claims (8)
1. an integral type leakage relay, it is characterized in that, comprise resistance-capacitance depressurization power supply and the zero sequence current mutual inductor be electrically connected successively, signal detection amplifying circuit, rectification circuit, comparing unit, return difference locking and action delay circuit and action executing circuit, resistance-capacitance depressurization power supply respectively connection signal detects amplifying circuit, rectification circuit, comparing unit and action executing circuit, described zero-sequence transformer and relay assembly integral.
2. a kind of integral type leakage relay according to claim 1, it is characterized in that, zero sequence current mutual inductor is parallel with the first relay K 1, zero sequence current mutual inductor one end ground connection, other end series resistance and electric capacity access signal detection amplifying circuit, described signal detection amplifying circuit comprises the signal deteching circuit and signal amplification circuit that are electrically connected successively.
3. a kind of integral type leakage relay according to claim 2, is characterized in that, described zero sequence current mutual inductor is also parallel with electric capacity C1, diode D4 and diode D5 successively at the upstream extremity of the first relay K 1.
4. a kind of integral type leakage relay according to claim 2, it is characterized in that, described signal amplification circuit connects an experimental circuit, described experimental circuit comprises three terminal regulator U3B, be connected with divider resistance between the input of three terminal regulator U3B and resistance-capacitance depressurization power supply, between the output of three terminal regulator U3B and signal amplification circuit, be connected with diode D10.
5. a kind of integral type leakage relay according to claim 4, it is characterized in that, described signal amplification circuit comprises three terminal regulator U3C, the output access rectification circuit of three terminal regulator U3C, the output that described rectification circuit comprises three terminal regulator U3A in parallel and three terminal regulator U3D, three terminal regulator U3A and three terminal regulator U3D is connected rectifier diode D2 and rectifier diode D6 respectively.
6. a kind of integral type leakage relay according to claim 5, it is characterized in that, the negative pole of the rectifier diode D2 in described rectification circuit is connected with the negative pole of rectifier diode D6 and accesses comparing unit, then by comparing unit access return difference locking and action delay circuit.
7. a kind of integral type leakage relay according to claim 1, it is characterized in that, described return difference locking and action delay circuit comprise three terminal regulator U2A, and the output of three terminal regulator U2A is connected with the second relay K 2, second relay K 2 other end access action executing circuit.
8. a kind of integral type leakage relay according to claim 7, it is characterized in that, described action executing circuit comprises three terminal regulator U2B, the input of three terminal regulator U2B is connected to the second relay K 2, the input of three terminal regulator U2B is connected with transistor Q2, and the collector electrode of transistor Q2 is connected with the 3rd relay K 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410351783.8A CN105322503A (en) | 2014-07-22 | 2014-07-22 | Integrated leakage relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410351783.8A CN105322503A (en) | 2014-07-22 | 2014-07-22 | Integrated leakage relay |
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| Publication Number | Publication Date |
|---|---|
| CN105322503A true CN105322503A (en) | 2016-02-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410351783.8A Pending CN105322503A (en) | 2014-07-22 | 2014-07-22 | Integrated leakage relay |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655085A (en) * | 2016-08-31 | 2017-05-10 | 兰溪市中冠电气科技有限公司 | Grounding protection apparatus preventing personal electric shock |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2165555Y (en) * | 1993-08-04 | 1994-05-18 | 张可 | Multifunctional protector for electric appliances |
| CN101741059A (en) * | 2009-12-31 | 2010-06-16 | 嘉兴市永信电子有限公司 | Intelligent electronic leakage protector |
| CN203377585U (en) * | 2013-08-28 | 2014-01-01 | 德力西电气有限公司 | Residual current protection circuit |
| CN204103450U (en) * | 2014-07-22 | 2015-01-14 | 金华市奥凯电器有限公司 | A kind of integral type leakage relay |
-
2014
- 2014-07-22 CN CN201410351783.8A patent/CN105322503A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2165555Y (en) * | 1993-08-04 | 1994-05-18 | 张可 | Multifunctional protector for electric appliances |
| CN101741059A (en) * | 2009-12-31 | 2010-06-16 | 嘉兴市永信电子有限公司 | Intelligent electronic leakage protector |
| CN203377585U (en) * | 2013-08-28 | 2014-01-01 | 德力西电气有限公司 | Residual current protection circuit |
| CN204103450U (en) * | 2014-07-22 | 2015-01-14 | 金华市奥凯电器有限公司 | A kind of integral type leakage relay |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655085A (en) * | 2016-08-31 | 2017-05-10 | 兰溪市中冠电气科技有限公司 | Grounding protection apparatus preventing personal electric shock |
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Application publication date: 20160210 |
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