CN2229724Y - Phase-faulty and phase interruption full-protector - Google Patents
Phase-faulty and phase interruption full-protector Download PDFInfo
- Publication number
- CN2229724Y CN2229724Y CN 95218330 CN95218330U CN2229724Y CN 2229724 Y CN2229724 Y CN 2229724Y CN 95218330 CN95218330 CN 95218330 CN 95218330 U CN95218330 U CN 95218330U CN 2229724 Y CN2229724 Y CN 2229724Y
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- CN
- China
- Prior art keywords
- phase
- voltage comparator
- circuit
- integrated voltage
- phase failure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model relates to a phase-faulty and phase interruption full-protector, comprising a DC power supply circuit, voltage sampling testing circuits, and a two-channel control output circuit of an integrated voltage comparator. The utility model adopts two sampling testing circuits, one of the voltage sampling testing circuits, which is arranged in front of an alternating current contactor is used to test the phase-faulty and phase interruption in the front, and the other one of the voltage sampling testing circuits which is arranged on the rear is only used to test the phase interruption on the rear. The utility model adopts the in-phase input terminal and the reversed phase input terminal of the integrated voltage comparator, and a gating terminal to carry out an independent two-channel control and drive a relay directly. The utility model has the advantage of complete functions. In particular, the utility model protects the main contact of an alternating current contactor from the accident of phase interruption caused by arc erosion, and makes up for the defects of the similar products both at home and abroad at present.
Description
The utility model relates to misphase and the phase failure general protection device that a kind of threephase motor uses.
Make a general survey of domestic and international existing misphase and phase failure relay; nearly all be single channel control; can only protect the open phase fault and the misphase of A.C. contactor the place ahead circuit; reliability is limited; their fundamental drawback is to protect the long-term dynamic phase failure accident that causes because of arc erosion of using of A.C. contactor main contacts, can not protect the phase failure accident of the rear circuit of A.C. contactor.Wherein the phase failure accident that causes because of the main contacts arc erosion will account for more than 40% of threephase motor phase failure accident usually.
The purpose of this utility model be a kind of dependable performance of design, control effectively, complete function, misphase with low cost, easy for installation, futuramic and phase failure general protection device; to remedy the deficiency of existing protector, promote the ratio of performance to price of model change, raising product.
The utility model is made up of base, housing and wiring board with a plurality of binding posts.
Technical characterstic of the present utility model is to adopt integrated voltage comparator CI
2, its output directly is connected with relay K A, and circuit is simple and direct; Adopt two independently voltage sample testing circuits, the testing circuit in A.C. contactor KM the place ahead has misphase, phase failure measuring ability, and the testing circuit at A.C. contactor KM rear only has phase failure measuring ability; Adopt integrated voltage comparator CI
2Homophase, anti-phase two inputs are to inverter V
5The voltage signal that provides compares and differentiates, with decision integrated voltage comparator output current whether; Adopt integrated voltage comparator gating end ST by changing the control level height, whether have the function of output current after the comparison with the decision comparator.
Below in conjunction with accompanying drawing the utility model is elaborated:
Fig. 1, Fig. 2 are respectively the utility model electric hookup and schematic diagram.
The three-phase circuit L in 1 of the utility model base, 2,3 binding posts and A.C. contactor KM the place ahead as seen from Figure 1
1, L
2, L
3Be connected 1,2,3, constitute the place ahead testing circuit.4,7,8 binding posts of its base then are connected 4,7,8 with three-phase circuit U, V, the W at the rear of A.C. contactor KM, constitute the rear testing circuit.5,6 binding posts of its base are serially connected in the normally opened contact of relay K A in the control loop of threephase motor.QS is a Three-phase knife switch, FU
1, FU
2Be fuse, FR is a thermal relay, SB
2Be starting button, SB
1Be stop button, M is a threephase motor.
As seen from Figure 2, wiring board of the present utility model is made up of DC power supply circuit, two voltage sample testing circuits and integrated voltage comparator binary channels controlling output circuit.Described dc power electric routing transformer T, circle heap CI
1And capacitor C
1Constitute; Described two voltage sample testing circuits are separately positioned on the place ahead and the rear of A.C. contactor, and the place ahead circuit has misphase and phase failure measuring ability, and it is by resistance R
1～R
4, diode V
1～V
4And capacitor C
2～C
4Constitute; The rear circuit only has phase failure measuring ability, and it is by resistance R
7, R
9～R
14, diode V
11～V
14And capacitor C
5Constitute; Described integrated voltage comparator binary channels controlling output circuit is by integrated voltage comparator CI
2, binary channels control circuit and relay K A constitute.Integrated voltage comparator CI in the first passage controlling output circuit
2Homophase, end of oppisite phase go into to hold a, b respectively with triode V
5Collector electrode be connected integrated voltage comparator CI with base stage
2Gating end ST and triode V
10Collector electrode be connected emitter series resistor R
8Back ground connection, base stage serial connection voltage-stabiliser tube V
9The back links to each other with A.C. contactor KM rear voltage sample testing circuit output.CI
2Output e is connected with relay K A coil one end, the other end ground connection of KA, and the normally opened contact of relay K A is serially connected in the control loop of motor M.
Light-emitting diode V
7One end and CI
2Output e is connected, ground connection behind the other end series resistor R5.Light-emitting diode V
6One end is connected with b, the other end and triode V
5Base stage be connected.
The integrated voltage comparator assembly becomes non-zero voltage comparator, employing+V
cSingle power supply, negative power end ground connection, relay K A is directly by non-zero voltage comparator C I
2Drive.
Operation principle of the present utility model is as follows: when normal and unusual (misphase or the phase failure) powered, the output voltage of A.C. contactor KM the place ahead voltage sample testing circuit had the order of magnitude to change this voltage u
1Through inverter V
5Couple directly to integrated voltage comparator CI after shaping and the amplification
2Input, during normal power supply, inverter V
5Input low level, output high level, integrated voltage comparator CI at this moment
2Forward is saturated, output voltage+V
e, relay K A gets electronic work, normally opened contact 5,6 closures in the Motor Control loop, and M gets ready for starting motor; During unusual the power supply, inverter V
5Input high level, output low level, integrated voltage comparator CI
2Negative sense is saturated, and output voltage is a null value, and relay K A must not be electric, and the normally opened contact 5,6 of control loop repeat circuit KA disconnects motor M fail to start.
A.C. contactor KM rear voltage sample testing circuit behind motor starting just immediately electric work, when three-phase is complete, voltage sample testing circuit output low level.Be not enough to puncture voltage-stabiliser tube V
9, triode V
10End, gating end ST is a high level, at this moment integrated voltage comparator CI
2Has comparing function; Disconnected any phase time, voltage sample testing circuit output high level, voltage-stabiliser tube V
8Breakdown, triode V
10Conducting, gating end ST is a low level, causes integrated voltage comparator CI
2Lose comparing function, output voltage is a null value, and relay K A must not be electric, and its normally opened contact 5,6 resets, and cuts off control loop, and the main circuit power supply is cut off.
Light-emitting diode V in the utility model
7(green) is relay indicating light, and during normal power supply, green indicating lamp is bright, V
6(redness) is malfunction indicator lamp.During unusual the power supply, red led is bright.
In sum, the utility model modern design, circuit is simple and direct; dual control; dependable performance, easy for installation, complete function, components and parts are few, with low cost, are applicable in 380 volts of electric power systems threephase motor and the equipment that dragged thereof are carried out the protection of the phase failure and misphase.
Claims (4)
1. the misphase of a complete function and phase failure general protection device; it is made of base, housing and the wiring board with a plurality of binding posts, it is characterized in that: wiring board comprises the indicator light of DC power supply circuit, two voltage sample testing circuits, integrated voltage comparator binary channels controlling output circuit, display abnormality and normal power supplies.
2. it is characterized in that by described misphase of claim 1 and phase failure general protection device: A.C. contactor KM the place ahead and rear are provided with the voltage sample testing circuit respectively, and its place ahead circuit is by the resistance R that can detect the misphase and the phase failure
1～R
4, diode V
1～V
4And capacitor C
2～C
4Constitute; Its rear circuit is by the resistance R that can detect the phase failure
5, R
9～R
14, diode V
11～V
14And capacitor C
5Form.
3. by described misphase of claim 1 and phase failure general protection device, it is characterized in that: integrated voltage comparator binary channels controlling output circuit is by integrated voltage comparator CI
2, binary channels control circuit and relay K A constitute, the first passage control circuit is by integrated voltage comparator CI
2Homophase, anti-phase two inputs respectively with inverter V
5Output, input be connected integrated voltage comparator CI
2Gating end ST and triode V
10Collector electrode is connected, emitter series resistor R
10Back ground connection, base stage serial connection voltage-stabiliser tube V
9The back links to each other integrated voltage comparator CI with rear voltage sample testing circuit output
2Output is connected with relay K A coil one end, coil other end ground connection, and the normally opened contact of relay K A is serially connected in the control loop of motor M.
4. by described misphase of claim 1 and phase failure general protection device, it is characterized in that: integrated voltage comparator CI
2Assembly becomes non-zero voltage comparator, employing+V
eSingle power supply, negative power end ground connection, relay K A is directly by integrated non-zero voltage comparator C I
2Drive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95218330 CN2229724Y (en) | 1995-08-10 | 1995-08-10 | Phase-faulty and phase interruption full-protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95218330 CN2229724Y (en) | 1995-08-10 | 1995-08-10 | Phase-faulty and phase interruption full-protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2229724Y true CN2229724Y (en) | 1996-06-19 |
Family
ID=33866896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95218330 Expired - Fee Related CN2229724Y (en) | 1995-08-10 | 1995-08-10 | Phase-faulty and phase interruption full-protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2229724Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111952954A (en) * | 2020-08-13 | 2020-11-17 | 国网湖北省电力有限公司咸宁供电公司 | Residual current action protection integrated device with phase sequence identification |
-
1995
- 1995-08-10 CN CN 95218330 patent/CN2229724Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111952954A (en) * | 2020-08-13 | 2020-11-17 | 国网湖北省电力有限公司咸宁供电公司 | Residual current action protection integrated device with phase sequence identification |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |