CN203135386U - Main contact adhesion detection device for AC contactor - Google Patents
Main contact adhesion detection device for AC contactor Download PDFInfo
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- CN203135386U CN203135386U CN 201320014621 CN201320014621U CN203135386U CN 203135386 U CN203135386 U CN 203135386U CN 201320014621 CN201320014621 CN 201320014621 CN 201320014621 U CN201320014621 U CN 201320014621U CN 203135386 U CN203135386 U CN 203135386U
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Abstract
The utility model relates to a main contact adhesion detection device and a detection method for an AC contactor so as to solve a problem that the main contacts cannot be separated when the contactor is under abnormal condition; the detection device comprises an AC contactor main loop, an AC contactor control loop, an adhesion signal detection circuit and a main controller control circuit; adhesion detection circuit signals are collected from a lower end of the AC contactor, an intermediate relay of the contactor control circuit and auxiliary contacts of the AC contactor; adhesion detection circuit output signals are passively output in an open-collector output manner; the main controller control circuit is the control circuit with a programmable controller PLC or a microcontroller MCU as a core, and can drive the intermediate relay to control the AC contactor and pre-stage power of the AC contactor. The detection device is simple in structure, stable and reliable in work, and can detect various work states of the AC contactor in real time; and if adhesion happens, fault signals will be sent immediately, the pre-stage power will be disconnected by the main controller, thereby ensuring safety of onsite work personnel and properties.
Description
Technical field
The utility model relates to that a kind of main contact can not disjunction and the A.C. contactor main contact adhesion checkout gear that designs when unusual in order to solve contactor.
Background technology
A.C. contactor is the common executive component in power-equipment and the distribution system, is applicable to the long distance control in the distribution system, frequently disjunction/connection main circuit and big volume controlled circuit.Be mainly used in Motor Control, electroheat equipment, capacitor group etc.
High-power and often work in the electric power system of overload state at some, when contactor transships serious or equipment short circuit, because electric current is very big, the main noddle on contactor caloric value can be very serious, so and the high temperature of generation can make the contact of contactor be sticked together.Even contactor control loop outage in this case, its main contact can not disjunction, power-equipment can't be out of service according to instruction, and this has brought great potential safety hazard for upstream device and staff, therefore need a kind of contactor device that main contact can not disjunction when unusual that solve.
Summary of the invention
In order to overcome above-mentioned defective of the prior art, whether the utility model provides a kind of contactor that can detect to stick together, when sticking together, can send control signal and give control appliance, level power supply before the control appliance automatic disconnection, give the alarm, and send information to Surveillance center, the staff is handling failure in time, avoids causing the A.C. contactor main contact adhesion checkout gear of heavy losses.
For achieving the above object, the technical scheme that provides of the utility model is as follows:
A kind of A.C. contactor adhesion checkout gear, comprise A.C. contactor major loop and control loop thereof, adhesion signal deteching circuit and main controller control circuit, it is characterized in that: described adhesion testing circuit signal is taken from auxiliary relay and the A.C. contactor auxiliary contact of A.C. contactor lower end, contactor control loop; Described adhesion testing circuit output signal is passive output, and pattern is open collector output; Described main controller control circuit is to be the control core circuit with Programmable Logic Controller PLC or microcontroller MCU, can drive auxiliary relay and realize control to the preceding level power supply of A.C. contactor and A.C. contactor.
Described A.C. contactor major loop comprises the isolating switch QS that links to each other with three phase mains; the fuse FU that is used for the motor short circuit protection that is connected with isolating switch QS; the thermal relay FR that is used for motor overload protection that links to each other with motor and be connected three phase mains and motor between major loop executive component A.C. contactor KM; connecting order is main power source U0; V0; W0 meets isolating switch QS; isolating switch QS lower end connects fuse FU1-FU3; fuse FU1-FU3 lower end connects A.C. contactor KM; A.C. contactor KM lower end connects thermal relay FR; thermal relay FR leading-out terminal connects motor, and described A.C. contactor lower end U11 draws the signal input part that lead is connected the adhesion testing circuit respectively with V11.
Described A.C. contactor control loop comprises transformer T, the control core main controller CPU of system, first normally opened contact of the start button start that links to each other with CPU, first normally opened contact of the stop button stop that links to each other with CPU, the auxiliary relay KA1 coil that is used for control A.C. contactor KM and links to each other with CPU, auxiliary relay KA1 normally opened contact, the thermal relay normally closed auxiliary contact is connected in turn with A.C. contactor KM coil, two are terminated at transformer output L1, N1, wherein the main controller power supply is taken from the output L1 that meets transformer T, N1, button start and stop signal be control auxiliary relay KA1 action after main controller is judged, disjunction/connection of the normally-closed contact control A.C. contactor KM of auxiliary relay KA1 normally opened contact and thermal relay.
Described adhesion signal deteching circuit comprises that signals collecting, signal are handled and signal output, it is respectively terminal S1, S2 and terminal S3, S4 that signals collecting has two parts, for detection of the A.C. contactor adhesion under two kinds of situations, the one, the adhesion of A.C. contactor main contact but auxiliary contact regular event, the 2nd, the adhesion simultaneously of A.C. contactor main contact and auxiliary contact; Terminal S1, S2 signal derive from A.C. contactor KM lower end, this signal is via the normally closed auxiliary contact of A.C. contactor KM, for detection of above-mentioned first kind of adhesion situation, the signal input part end connects diode D and carries out halfwave rectifier, and connect resistance R 2, R3 produces and meets the electric current that photoelectrical coupler PL uses, capacitor C is connected in parallel on resistance R 3 and photoelectrical coupler PL two ends are used for filtering, guarantee that photoelectrical coupler PL is lasting open-minded when first kind of adhesion appears in A.C. contactor KM, transistor T 1 is open-minded simultaneously; The base stage that photoelectrical coupler PL output circuit connects transistor T 1 forms the open collector output circuit; What terminal S3, S4 signal were taken from the normally-closed contact of auxiliary relay KA1 and A.C. contactor KM often drives auxiliary contact, the series connection of two contacts is connected the base stage of transistor T 2 through current-limiting resistance R1, for detection of above-mentioned second kind of adhesion situation, when this adhesion takes place in contactor, transistor T 2 is open-minded, forms the open collector output circuit; The logic OR circuit is formed in the output in parallel of described two kinds of adhesion situation testing circuits, and wherein any one circuit has the transmission of adhesion signal all can produce output signal at S5, S6 end.
Described adhesion testing circuit is passive circuit, and input is respectively by A.C. contactor KM lower end U11, V11 and the power supply of main controller terminal.
Advantage and the good effect that the utlity model has are:
1, simple in structure, working stability is reliable, can detect the various operating states of A.C. contactor in real time, in case stick together, sends fault-signal immediately, and level power supply before disconnecting by main controller guarantees field personnel and property safety.
The testing circuit no current cooperated main controller to guarantee electric power system safety by playing the effect of energy-saving and emission-reduction when 2, the adhesion testing circuit was passive circuit, contactor operate as normal, avoided causing heavy losses.
Description of drawings
Fig. 1 is adhesion testing circuit of the present utility model.
Fig. 2 is contactor major loop of the present utility model and control loop thereof.
Embodiment
As shown in Figure 1, 2, the utility model discloses a kind of A.C. contactor adhesion checkout gear, comprise A.C. contactor major loop and control loop thereof, adhesion signal deteching circuit and main controller control circuit, it is characterized in that: described adhesion testing circuit signal is taken from auxiliary relay and the A.C. contactor auxiliary contact of A.C. contactor lower end, contactor control loop; Described adhesion testing circuit output signal is passive output, and pattern is open collector output; Described main controller control circuit is to be the control core circuit with Programmable Logic Controller PLC or microcontroller MCU, can drive auxiliary relay and realize control to the preceding level power supply of A.C. contactor and A.C. contactor.
As shown in Figure 2; A.C. contactor major loop described in the utility model comprises the isolating switch QS that links to each other with three phase mains; the fuse FU that is used for the motor short circuit protection that is connected with isolating switch QS; the thermal relay FR that is used for motor overload protection that links to each other with motor and be connected three phase mains and motor between major loop executive component A.C. contactor KM; connecting order is main power source U0; V0; W0 meets isolating switch QS; isolating switch QS lower end connects fuse FU1-FU3; fuse FU1-FU3 lower end connects A.C. contactor KM; A.C. contactor KM lower end connects thermal relay FR; thermal relay FR leading-out terminal connects motor, and described A.C. contactor lower end U11 draws the signal input part that lead is connected the adhesion testing circuit respectively with V11.
As shown in Figure 2, A.C. contactor control loop described in the utility model comprises transformer T, the control core main controller CPU of system, first normally opened contact of the start button start that links to each other with CPU, first normally opened contact of the stop button stop that links to each other with CPU, the auxiliary relay KA1 coil that is used for control A.C. contactor KM and links to each other with CPU, auxiliary relay KA1 normally opened contact, the thermal relay normally closed auxiliary contact is connected in turn with A.C. contactor KM coil, two are terminated at transformer output L1, N1, wherein the main controller power supply is taken from the output L1 that meets transformer T, N1, button start and stop signal be control auxiliary relay KA1 action after main controller is judged, disjunction/connection of the normally-closed contact control A.C. contactor KM of auxiliary relay KA1 normally opened contact and thermal relay.
As shown in Figure 2, adhesion signal deteching circuit described in the utility model comprises that signals collecting, signal are handled and signal output, it is respectively terminal S1, S2 and terminal S3, S4 that signals collecting has two parts, for detection of the A.C. contactor adhesion under two kinds of situations, the one, the adhesion of A.C. contactor main contact but auxiliary contact regular event, the 2nd, the adhesion simultaneously of A.C. contactor main contact and auxiliary contact; Terminal S1, S2 signal derive from A.C. contactor KM lower end, this signal is via the normally closed auxiliary contact of A.C. contactor KM, for detection of above-mentioned first kind of adhesion situation, the signal input part end connects diode D and carries out halfwave rectifier, and connect resistance R 2, R3 produces and meets the electric current that photoelectrical coupler PL uses, capacitor C is connected in parallel on resistance R 3 and photoelectrical coupler PL two ends are used for filtering, guarantee that photoelectrical coupler PL is lasting open-minded when first kind of adhesion appears in A.C. contactor KM, transistor T 1 is open-minded simultaneously; The base stage that photoelectrical coupler PL output circuit connects transistor T 1 forms the open collector output circuit; What terminal S3, S4 signal were taken from the normally-closed contact of auxiliary relay KA1 and A.C. contactor KM often drives auxiliary contact, the series connection of two contacts is connected the base stage of transistor T 2 through current-limiting resistance R1, for detection of above-mentioned second kind of adhesion situation, when this adhesion takes place in contactor, transistor T 2 is open-minded, forms the open collector output circuit; The logic OR circuit is formed in the output in parallel of described two kinds of adhesion situation testing circuits, and wherein any one circuit has the transmission of adhesion signal all can produce output signal at S5, S6 end.
Described adhesion testing circuit is passive circuit, and input is respectively by A.C. contactor KM lower end U11, V11 and the power supply of main controller terminal.
This device is divided into major loop and control loop, and major loop adopts conventional short circuit, overload protection measure.Control loop is core with the main controller, by the disjunction/connection of KA1 control contactor, by level power supply before the KA2 disjunction and warning, provides a signal to watch-dog by the signal_out port, and this signal is used for centralized management control, can.
Behind the Contactor Starting, when operate as normal and normal disjunction, signal input part all disconnects.
During the contactor operate as normal: the normally closed point of KM is opened, and photoelectrical coupler PL is cut off as the loop, and coupler input electric current is zero, does not have electric current output, and transistor T 1 ends, no signal output; KM control relay KA1 normally-closed contact is opened, and transistor T 2 ends; The output of fault-free signal;
During the normal disjunction of contactor: the KM main contact disconnects, though the KM normally-closed contact closes, has connected the photoelectrical coupler loop, U11, V11 no-voltage, and the photoelectrical coupler input does not still have electric current, does not have electric current output, and transistor T 1 ends; KM often opens assisting in opening, and transistor T 2 tunnel ends; The output of fault-free signal;
When contactor disjunction fault, wherein one road signal input part can be closed.
Main controller control KA1 makes the KM disjunction, when main noddle on contactor adhesion auxiliary contact does not have adhesion: the adhesion of KM main contact, the KM normally closed auxiliary contact does not have adhesion to close, signal is connected, and U11, V11 voltage 1140V are through diode D halfwave rectifier, resistance R 2, R3 current limliting, capacitor C filtering, photoelectrical coupler PL is open-minded, and T1 is open-minded for coupler output circuit driving transistors; KM often drives auxiliary contact and opens, and transistor T 2 ends;
The output of adhesion fault signal is arranged this moment.
Main controller control KA1 makes the KM disjunction, during the adhesion simultaneously of main noddle on contactor and auxiliary contact: the normally closed point of KM is opened owing to being in the adhesion state, and photoelectrical coupler PL is cut off as the loop, and coupler input electric current is zero, do not have electric current output, transistor T 1 ends; It is closed that KM control relay KA1 normally-closed contact has recovered, and KM often drives auxiliary contact because adhesion also is in closure state, and transistor T 2 is open-minded; The output of adhesion fault signal is arranged this moment.
When above-mentioned situation had the output of adhesion fault signal, main controller made the KA2 action according to the signal that monitors, and KA2 can cut off the electricity supply and give the alarm, and issues a signal to watch-dog by signal_out simultaneously.
Its circuit theory (is the adhesion checkout gear) as shown in Figure 1 in the thick frame, this circuit is applicable to the electronic type control system, when contactor sticks together, this device can send current signal to control system, control system just can in time be sent instruction and turn-off preceding level power supply, guarantees the safety of whole electric power system.
During system's normal (no adhesion), contactor KM coil is outage in a single day, and main contact will be opened normally closed auxiliary contact closure simultaneously, and the adhesion device can be not charged, the output port no-output.
When adhesion appears in main contact, in two kinds of situation: 1. auxiliary contact are simultaneously bonding; 2. auxiliary contact normally reset.
1. during auxiliary contact adhesion simultaneously, T2 will conducting among Fig. 1, provides current signal to the outside.
2. when main contact adhesion, auxiliary contact normally resetted, the V of power supply, W two phase voltages just were added in the input port of adhesion device.Simultaneously to the capacitor C charging, negative half-cycle supplies optocoupler work by capacitor discharge to the positive half period of alternating current to the optocoupler power supply.Optical coupler is selected the driving device of low current, this circuit is selected HCPL0701 for use, and its lowest drive current is 0.01mA, and its CTR has just reached 1000% during 0.1mA, the energising back makes T be operated in the effect that saturation condition just can play switch by optical coupler driving transistors T.When this device is used for the PLC controller, as shown in Figure 2, when the contactor adhesion, under the effect of DC power supply, the photoelectric current that optocoupler PL forms amplifies through transistor T, as long as the β value of T surpasses 100, its output current just can reach 100mA, enough drives the input terminal of PLC.
Device parameters requires:
R3 is in order to increase the charging voltage of capacitor C, to increase its storage power, by W=CU
2/ 2 as can be known, and U can not be too small, otherwise the C energy stored just can not be kept the continuous conducting of optocoupler PL, and the terminal voltage of C can rise to I behind the increase R3
PL* if R3 is I
PLValue 0.15mA, according to the voltage endurance of common electric capacity, the desirable 100K of R3 here.Because the power-frequency voltage frequency is 50Hz, thus C as long as can also keep PL output when guaranteeing 0.02S, the value of pressing above R3, voltage 15V when C is full of electricity, in order to make the PL operate as normal, make 0.02S after voltage be maintained to more than the 10V, electric current is more than the 1mA.Therefore can get equation:
Solve an equation and can get C 4.9*10-7, but that the value of C also is difficult for is excessive, otherwise the charging interval is long, and response speed is slow, desirable 1uF.The selection of R2 is relevant with supply power voltage, calculates comparatively complexity, but uses circuit simulating software to be easy to just can obtain suitable parameters.In the 220V power supply circuits, when R2 got 300K, the DC component of PL was 0.11mA, and the loop total current is 0.6mA.The R2 power consumption is I2*R2=0.11W.
Claims (5)
1. A.C. contactor main contact adhesion checkout gear, comprise A.C. contactor major loop and control loop thereof, adhesion signal deteching circuit and main controller control circuit, it is characterized in that: described adhesion testing circuit signal is taken from auxiliary relay and the A.C. contactor auxiliary contact of A.C. contactor lower end, contactor control loop; Described adhesion testing circuit output signal is passive output, and pattern is open collector output; Described main controller control circuit is to be the control core circuit with Programmable Logic Controller PLC or microcontroller MCU, can drive auxiliary relay and realize control to the preceding level power supply of A.C. contactor and A.C. contactor.
2. A.C. contactor main contact adhesion checkout gear according to claim 1; it is characterized in that: described A.C. contactor major loop comprises the isolating switch QS that links to each other with three phase mains; the fuse FU that is used for the motor short circuit protection that is connected with isolating switch QS; the thermal relay FR that is used for motor overload protection that links to each other with motor and be connected three phase mains and motor between major loop executive component A.C. contactor KM; connecting order is main power source U0; V0; W0 meets isolating switch QS; isolating switch QS lower end connects fuse FU1-FU3; fuse FU1-FU3 lower end connects A.C. contactor KM; A.C. contactor KM lower end connects thermal relay FR; thermal relay FR leading-out terminal connects motor, and described A.C. contactor lower end U11 draws the signal input part that lead is connected the adhesion testing circuit respectively with V11.
3. A.C. contactor main contact adhesion checkout gear according to claim 1, it is characterized in that: described A.C. contactor control loop comprises transformer T, the control core main controller CPU of system, first normally opened contact of the start button start that links to each other with CPU, first normally opened contact of the stop button stop that links to each other with CPU, the auxiliary relay KA1 coil that is used for control A.C. contactor KM and links to each other with CPU, auxiliary relay KA1 normally opened contact, the thermal relay normally closed auxiliary contact is connected in turn with A.C. contactor KM coil, two are terminated at transformer output L1, N1, wherein the main controller power supply is taken from the output L1 that meets transformer T, N1, button start and stop signal be control auxiliary relay KA1 action after main controller is judged, disjunction/connection of the normally-closed contact control A.C. contactor KM of auxiliary relay KA1 normally opened contact and thermal relay.
4. A.C. contactor main contact adhesion checkout gear according to claim 1, it is characterized in that: described adhesion signal deteching circuit comprises that signals collecting, signal are handled and signal output, it is respectively terminal S1, S2 and terminal S3, S4 that signals collecting has two parts, for detection of the A.C. contactor adhesion under two kinds of situations, the one, the adhesion of A.C. contactor main contact but auxiliary contact regular event, the 2nd, the adhesion simultaneously of A.C. contactor main contact and auxiliary contact; Terminal S1, S2 signal derive from A.C. contactor KM lower end, this signal is via the normally closed auxiliary contact of A.C. contactor KM, for detection of above-mentioned first kind of adhesion situation, the signal input part end connects diode D and carries out halfwave rectifier, and connect resistance R 2, R3 produces and meets the electric current that photoelectrical coupler PL uses, capacitor C is connected in parallel on resistance R 3 and photoelectrical coupler PL two ends are used for filtering, guarantee that photoelectrical coupler PL is lasting open-minded when first kind of adhesion appears in A.C. contactor KM, transistor T 1 is open-minded simultaneously; The base stage that photoelectrical coupler PL output circuit connects transistor T 1 forms the open collector output circuit; What terminal S3, S4 signal were taken from the normally-closed contact of auxiliary relay KA1 and A.C. contactor KM often drives auxiliary contact, the series connection of two contacts is connected the base stage of transistor T 2 through current-limiting resistance R1, for detection of above-mentioned second kind of adhesion situation, when this adhesion takes place in contactor, transistor T 2 is open-minded, forms the open collector output circuit; The logic OR circuit is formed in the output in parallel of described two kinds of adhesion situation testing circuits, and wherein any one circuit has the transmission of adhesion signal all can produce output signal at S5, S6 end.
5. A.C. contactor main contact adhesion checkout gear according to claim 4, it is characterized in that: described adhesion testing circuit is passive circuit, input is respectively by A.C. contactor KM lower end U11, V11 and the power supply of main controller terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320014621 CN203135386U (en) | 2013-01-11 | 2013-01-11 | Main contact adhesion detection device for AC contactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320014621 CN203135386U (en) | 2013-01-11 | 2013-01-11 | Main contact adhesion detection device for AC contactor |
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| CN203135386U true CN203135386U (en) | 2013-08-14 |
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| CN 201320014621 Expired - Fee Related CN203135386U (en) | 2013-01-11 | 2013-01-11 | Main contact adhesion detection device for AC contactor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103022959A (en) * | 2013-01-11 | 2013-04-03 | 南阳防爆电气研究所有限公司 | Method and device for adhesion detection of main contact of alternating-current contactor |
| CN105485867A (en) * | 2015-12-18 | 2016-04-13 | 珠海格力电器股份有限公司 | Control method and device for air conditioner and circuit |
| CN109490768A (en) * | 2018-11-12 | 2019-03-19 | 北京长城华冠汽车科技股份有限公司 | The redundance judging method and system of contacts of contactor adhesion |
-
2013
- 2013-01-11 CN CN 201320014621 patent/CN203135386U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103022959A (en) * | 2013-01-11 | 2013-04-03 | 南阳防爆电气研究所有限公司 | Method and device for adhesion detection of main contact of alternating-current contactor |
| CN103022959B (en) * | 2013-01-11 | 2014-12-24 | 南阳防爆电气研究所有限公司 | Method and device for adhesion detection of main contact of alternating-current contactor |
| CN105485867A (en) * | 2015-12-18 | 2016-04-13 | 珠海格力电器股份有限公司 | Control method and device for air conditioner and circuit |
| CN105485867B (en) * | 2015-12-18 | 2018-12-07 | 珠海格力电器股份有限公司 | Control method, device and the circuit of air-conditioning |
| CN109490768A (en) * | 2018-11-12 | 2019-03-19 | 北京长城华冠汽车科技股份有限公司 | The redundance judging method and system of contacts of contactor adhesion |
| CN109490768B (en) * | 2018-11-12 | 2021-01-26 | 北京长城华冠汽车科技股份有限公司 | Redundancy judgment method and system for contactor contact adhesion |
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