CN1048363C - Three-phase AC Voltage protector - Google Patents
Three-phase AC Voltage protector Download PDFInfo
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- CN1048363C CN1048363C CN98110669A CN98110669A CN1048363C CN 1048363 C CN1048363 C CN 1048363C CN 98110669 A CN98110669 A CN 98110669A CN 98110669 A CN98110669 A CN 98110669A CN 1048363 C CN1048363 C CN 1048363C
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- circuit
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Abstract
The present invention relates to a voltage-type emergency protective device for a power source input end and a load end of a three-phase AC circuit. The present invention circuit simultaneously protects the load ends on the basis of the existent input end protection. A protection circuit of one load end is composed of a rectifying circuit 5, a detection circuit 6 and a coupling circuit, wherein the rectifying circuit is connected to the detection circuit, while the detection circuit is connected to the coupling circuit. A virtual voltage supplied by a DC voltage source is connected between the rectifying circuit and the detection circuit. The DC voltage source is obtained after the rectification of the three-phase AC power source input end. The present invention can realize the protection for a plurality of load end targets, and has the advantages of simple control circuit, clear failure display, etc.
Description
The present invention relates to three-phase circuit power input and load terminal voltage type emergency protective device.
Electric drive in the three-phase circuit is made up of three-phase alternating-current supply, protective device and control device, load (as motor) etc.Be connected to load from three-phase alternating-current supply, according to the difference of dragging load, the centre is connected to protective device and control device.Control device is generally A.C. contactor, the employing industrial procedure controller that has or other intelligent controller.Three-phase alternating-current supply is called power input between control device, and control device is called load end between load.Existing voltage protection generally can only be protected power input or load end; being the protective device of input has defencive function for the phase sequence of three phase mains inlet wire, the phase failure, Voltage unbalance, under-voltage overvoltage etc., perhaps adopts such as the subsidiary loop of moving closing (the often opening) contact of the delayed start-up of the time relay at load end and realizes protection.Existing three-phase alternating voltage protective device adopts be at the three-phase alternating-current supply input by detection to phase sequence, the phase failure, under-voltage and overvoltage, Voltage unbalance, circuit output signal is differentiated behind the coupling circuit control relay action to signal and the three-phase main circuit is carried out is opened and closed after testing.The three-phase alternating voltage protective device adopts the subsidiary loop of the time relay to realize to the protection of load end; but it has inconvenience in the use; as: control circuit is complicated; the setting of delay time brings destabilizing factor to the reliability of the protective feature of circuit; maintenance detects inconvenient; the form of expression of fault is indeterminate, and original fault of power input is not protected (promptly under the out of order situation of input, switch can also close) or the like.
The object of the present invention is to provide a kind of three-phase ac voltage protector, it compared with prior art can all can realize urgent protection at three-phase circuit power input and load end, and simple in structure, easy to maintenance.
For achieving the above object, the present invention inserts one and presets operating voltage between load end step-down rectifying circuit that detection line that the three-phase circuit load end is drawn connects and load end testing circuit, under the load end off-position, the load end testing circuit is exported normal signal presetting under the operating voltage effect, make the relay adhesive, then load end is in the permission "on" position.A.C. contactor is in case connection makes the load end energising, then the load end detection line receives the voltage signal back loading end testing circuit work from three-phase circuit, and control relay adhesive or disconnection, and then the switching of the A.C. contactor main contacts in the control three-phase main circuit.
Operation principle of the present invention is as follows: the three-phase detection circuit that the three-phase circuit power input is drawn through behind the step-down rectifying circuit again behind open-phase detection circuit, Voltage unbalance testing circuit, circuit of testing the phase sequence, over-and under-voltage testing circuit output detection signal to signal differentiate coupling circuit, differentiate the coupling circuit control relay by signal; Draw the three-phase detection circuit at the three-phase circuit load end, this detection line is differentiated coupling circuit by load end step-down rectifying circuit, load end testing circuit and signal and is formed, the load end step-down rectifying circuit connects the load end testing circuit, this load end testing circuit comprises open-phase detection circuit, Voltage unbalance testing circuit, the load end testing circuit is connected in signal and differentiates coupling circuit, be connected to the operating voltage that presets from another output between load end step-down rectifying circuit and load end testing circuit again, this presets operating voltage is direct voltage.When A.C. contactor does not close, load end is in off-position, preset operating voltage and work dc voltage value of output to the load end testing circuit, make testing circuit obtain one that set in advance, and to export testing result be that normal signal to signal is differentiated coupling circuit, differentiate the adhesive of coupling circuit control relay by signal, the conducting of can closing of the A.C. contactor of three-phase alternating current main circuit.When A.C. contactor closes, the load end conducting, the three-phase alternating voltage that load end is drawn is input to the load end testing circuit after line drop, the rectification after testing, dc voltage value after three characteristics of the middle term voltage step-down, the rectification greater than and covered and preset operational voltage value, the detected signal of load end testing circuit is the load end three-phase voltage signal, load end testing circuit output signal is differentiated coupling circuit to signal, and signal is differentiated the action of coupling circuit output signal control relay.When signal for just often, relay keeps attracting state, the three-phase alternating current main circuit can be by inlet wire to the load conducting and make load running; When signal was undesired, relay disconnected, and the ac contactor coil loop disconnects, and main contacts disconnects, the load outage.The adhesive of relay is by the break-make of contact realization to ac contactor coil with disconnecting, and controls the break-make that the three-phase ac contactor main contacts is realized main circuit then.
Fig. 1 is a prior art three-phase alternating voltage power input protective device control circuit schematic diagram; Fig. 2 is a prior art three-phase alternating voltage power input protective device circuit block diagram; Fig. 3 is existing three-phase alternating voltage load end protective device control circuit schematic diagram; Fig. 4 is a three-phase alternating voltage protective device control circuit schematic diagram of the present invention; Fig. 5 is a three-phase alternating voltage protective device circuit block diagram of the present invention; Fig. 6 is load end protective circuit block diagram in the three-phase alternating voltage protective device of the present invention, and Fig. 7 is load end protective device one a phase voltage value schematic diagram of the present invention.
With reference to accompanying drawing, be described in detail specific embodiments of the present invention.
In Fig. 1; three-phase ac voltage protector is protected three-phase power input end; from the three-phase alternating voltage main circuit; promptly by the three phase mains inlet wire; be connected to the A.C. contactor main contacts; the A.C. contactor main contacts is connected to load, draws three-phase voltage detection lead-in wire from the A.C. contactor input and receives the control loop of being made up of relay J and A.C. contactor K (coil and auxiliary contact).The circuit block diagram of this control loop as shown in Figure 2, the three-phase voltage of drawing from three phase mains inlet wire R, S, T inputs to testing circuit behind the power end step-down rectifying circuit, respectively behind open-phase detection circuit, Voltage unbalance testing circuit, circuit of testing the phase sequence, over-and under-voltage testing circuit, output signal to signal and differentiate coupling circuit, differentiate coupling circuit control relay J by signal.The testing circuit output signal is normal, then relay J adhesive, and A.C. contactor K can close, and is undesired as output signal, and then relay J disconnects, and A.C. contactor K can not close.Whether the electric power incoming line that can detect the three-phase alternating current main circuit like this meets the load request that is dragged.
In Fig. 3, three-phase ac voltage protector is a load end protection to the A.C. contactor of three-phase circuit to the major loop of load.Draw three-phase circuit from the load end of three-phase alternating voltage major loop and detect lead-in wire; the folding of detection signal control relay J after signal is differentiated coupling circuit; the time relay of moving closing (the often opening) contact of power line of drawing in A.C. contactor K main contacts upper end and A.C. contactor K (coil and auxiliary contact), delayed start-up, switch etc. are formed a control loop, and mainly the subsidiary loop that constitutes of moving closing (often opening) the contact KT of the delayed start-up by the time relay is realized protection to major loop.
Fig. 4 has provided a kind of the simplest control circuit figure by the concrete scheme of three-phase ac voltage protector of the present invention, and this control circuit figure combines power input protection and load end protection (being the protection of power input and load end).Fig. 5 is the circuit block diagram of Fig. 4, and Fig. 6 provides the circuit block diagram of three-phase ac voltage protector load end protection of the present invention, and Fig. 7 has provided a phase voltage value that is indicated on the reference axis.In Fig. 4, having indicated power input three-phase voltage lead-out wire is R, S, T, and load end three-phase voltage lead-out wire is r, s, t.
In the figure of the circuit controling line road of Fig. 4, Fig. 5, when the control loop of power input R, S, T can enter A.C. contactor K main contacts to three-phase alternating-current supply phase sequence, the phase failure, over-and under-voltage, the Voltage unbalance of the desired three phase mains of load are protected.Detection line r, s that load end is drawn, t mutually in, comprise load end step-down rectifying circuit 5, load end testing circuit 6 and signal differentiation coupling circuit, load end step-down rectifying circuit 5 is connected to testing circuit 6, and load end testing circuit 6 is connected to signal and differentiates coupling circuit.Because power input R, S, T detect phase sequence, under-voltage overvoltage etc., can guarantee that the three-phase alternating-current supply of importing meets the requirement of load.Protection at load end is mainly the phase failure and Voltage unbalance, so load end testing circuit 6 is set to open-phase detection circuit and Voltage unbalance testing circuit, has guaranteed that load both can just transport row, the operation of also can reversing.The signal arriving signal of load end testing circuit 6 outputs is differentiated coupling circuit, the adhesive of control relay J after signal is differentiated the coupling circuit processing, and then the switching of control A.C. contactor K coil and main contacts.But between power input protection and load end protection, there is a problem of how to mate; the present invention has introduced one and has preset operating voltage Vx; this presets between the step-down rectifying circuit 5 and testing circuit 6 that operating voltage is connected on load end r, s, t phase; be direct voltage; see Fig. 6, for sake of convenience, now select for use the r phase voltage to specify; see Fig. 7, s, t phase operation principle are mutually identical with r in addition.
The power supply of three-phase alternating voltage main circuit is connected to load through A.C. contactor K main contacts, drags load running.Three-phase detection lead-in wire R, the S, the T that draw at power input and load end are connected three-phase ac voltage protector with r, s, t.Referring to Fig. 4, Fig. 6, r with load end is example mutually, before A.C. contactor K main contacts does not have adhesive, r cuts off the power supply mutually, a point current potential between load end step-down rectifying circuit 5 and load end testing circuit 6 should be zero, but, the present invention presets operating voltage Vxr because inserting one at a point, so the magnitude of voltage that a is ordered is Vxr, this presets operational voltage value Vxr and is set to minimum operating voltage Vq greater than load end testing circuit 6, (if a point voltage be lower than Vq then testing circuit 6 with misoperation or do not work), like this load end testing circuit 6 exportable by the normal signal that presets output under the operating voltage effect to signal differentiation coupling circuit and then control relay J adhesive, but the conducting of A.C. contactor K coil, A.C. contactor K main contacts then can be closed.After A.C. contactor K main contacts closed, r was conducted, and the direct voltage of exporting through load end step-down rectifying circuit 5 by the alternating voltage of r phase is Vr, and this load end step-down rectifying circuit 5 is by resistance R
1, R
2With diode N
1And capacitor C
1Form, because of r cross streams voltage has ceiling voltage and minimum voltage, so the direct voltage peak of exporting after step-down, rectification is Vr
+, minimum is Vr
-, the scope of the direct voltage Vr of r cross streams voltage after step-down, rectification is at Vr
-And Vr
+Between, Vxr should be less than Vr when presetting operating voltage Vxr and being provided with
-, referring to Fig. 7.Because the impedance of presetting operating voltage and r be the impedance matching of step-down rectifying circuit 5 and testing circuit 6 mutually, thus get high potential Vr during the detection of a point, the Vr value greater than and covered and preset operational voltage value Vxr, load end testing circuit 6 is got the detection of Vr current potential.If the r phase voltage is normal, then testing circuit 6 this signal of output control relay J adhesives after signal is differentiated coupling circuit, A.C. contactor K main contacts remains closed shape, the main circuit energising; If the r phase voltage is undesired, then testing circuit 6 this signal of output control relay J after signal is differentiated coupling circuit disconnect, A.C. contactor K coil blackout, and the A.C. contactor main contacts disconnects, the main circuit outage.Therefore the value that presets operating voltage Vxr is for the minimum operating voltage Vq greater than load end testing circuit 6, less than the minimum dc voltage value Vr of the three-phase voltage of exporting after step-down, rectification
-, referring to Fig. 7, in like manner applicable to s, t phase voltage.Presetting operating voltage Vx is provided by direct voltage source, and this direct voltage source obtains after three-phase alternating-current supply input R, S, T step-down, rectification.This presets operating voltage is direct voltage, and this direct voltage is greater than the minimum operating voltage of load end testing circuit 6, less than load end r, s, the t three-phase voltage dc voltage value of output respectively after step-down, rectification.Load end testing circuit 6 is set to open-phase detection circuit and Voltage unbalance testing circuit.
Three-phase ac voltage protector of the present invention both can have been realized three-phase power input end is protected Protect, can protect load end again, can be to R, S, T end and r, s, t end Between the fault that takes place protect. Protective device repeat circuit J of the present invention is not only controlled The coil of A.C. contactor K processed also can be controlled such as industrial procedure controller or other intelligent Controller; When apparatus of the present invention and meet multichannel r, s, t, can realize multi-load end object Protection, to the broad covered area of alternating current circuit protection, and it is simple to have a control circuit, maintenance Convenient, fault shows and judges the advantages such as easy.
Claims (3)
1. three-phase ac voltage protector; be connected between the power input and A.C. contactor main contacts of three-phase alternating current main circuit; the A.C. contactor main contacts connects load; this voltage protector is by power end step-down rectifying circuit (1); power end testing circuit (2); signal differentiates coupling circuit and relay is formed; power end step-down rectifying circuit (1) is connected to power end testing circuit (2); power end testing circuit (2) is connected to signal and differentiates coupling circuit; signal is differentiated coupling circuit output signal control relay and is opened and closed; power end testing circuit (2) comprises phase sequence; the phase failure; Voltage unbalance; under-voltage over-voltage detection circuit; it is characterized in that this voltage protector also comprises the load end step-down rectifying circuit (5) that connects to the detection line of drawing between the load from the A.C. contactor main contacts; load end testing circuit (6) and signal are differentiated coupling circuit; load end step-down rectifying circuit (5) is connected to load end testing circuit (6); load end testing circuit (6) is connected to signal and differentiates coupling circuit; insert one and preset operating voltage between load end step-down rectifying circuit (5) and load end testing circuit (6), load end testing circuit (6) comprises open-phase detection circuit; the Voltage unbalance testing circuit.
2. three-phase ac voltage protector according to claim 1, it is characterized in that presetting operating voltage is to be provided by direct voltage source, this direct voltage source obtains after the step-down of three-phase alternating-current supply input, rectification.
3. three-phase ac voltage protector according to claim 1 and 2; it is characterized in that presetting operating voltage is direct voltage; this voltage is greater than the minimum operating voltage of load end testing circuit (6), less than three-phase mains voltage dc voltage value of output respectively after step-down, rectification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98110669A CN1048363C (en) | 1998-02-24 | 1998-02-24 | Three-phase AC Voltage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98110669A CN1048363C (en) | 1998-02-24 | 1998-02-24 | Three-phase AC Voltage protector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1190817A CN1190817A (en) | 1998-08-19 |
| CN1048363C true CN1048363C (en) | 2000-01-12 |
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ID=5220695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98110669A Expired - Fee Related CN1048363C (en) | 1998-02-24 | 1998-02-24 | Three-phase AC Voltage protector |
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| Country | Link |
|---|---|
| CN (1) | CN1048363C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103490376A (en) * | 2012-06-13 | 2014-01-01 | 西门子公司 | Over-voltage and under-voltage protection device for single-phase source system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104300491A (en) * | 2014-11-06 | 2015-01-21 | 北京铁道工程机电技术研究所有限公司 | Power supply protecting circuit for movable car lifting machine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2072291U (en) * | 1990-07-17 | 1991-02-27 | 倪建国 | Multifunctional protector for three-phase motor |
| CN2096831U (en) * | 1991-08-07 | 1992-02-19 | 唐山钢铁公司中型轧钢厂 | Three-phase electric machinery protector |
| CN2120401U (en) * | 1992-03-06 | 1992-10-28 | 岳阳市三力电控设备厂 | Multi-function protector for three-phase motor |
-
1998
- 1998-02-24 CN CN98110669A patent/CN1048363C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2072291U (en) * | 1990-07-17 | 1991-02-27 | 倪建国 | Multifunctional protector for three-phase motor |
| CN2096831U (en) * | 1991-08-07 | 1992-02-19 | 唐山钢铁公司中型轧钢厂 | Three-phase electric machinery protector |
| CN2120401U (en) * | 1992-03-06 | 1992-10-28 | 岳阳市三力电控设备厂 | Multi-function protector for three-phase motor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103490376A (en) * | 2012-06-13 | 2014-01-01 | 西门子公司 | Over-voltage and under-voltage protection device for single-phase source system |
| CN103490376B (en) * | 2012-06-13 | 2016-04-06 | 西门子公司 | For the over-and under-voltage protective device of single-phase source system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1190817A (en) | 1998-08-19 |
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