CN102890237B - The detection method of a kind of high-voltage DC contactor main contacts fault and device - Google Patents
The detection method of a kind of high-voltage DC contactor main contacts fault and device Download PDFInfo
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- CN102890237B CN102890237B CN201210374273.3A CN201210374273A CN102890237B CN 102890237 B CN102890237 B CN 102890237B CN 201210374273 A CN201210374273 A CN 201210374273A CN 102890237 B CN102890237 B CN 102890237B
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Abstract
The invention discloses the detection method of a kind of high-voltage DC contactor main contacts fault, the main contacts two ends of D.C. contactor are connected with electrical equipment and the first DC source respectively, and electrical equipment is connected with the first DC source, the auxiliary contact two ends of D.C. contactor are connected with dropping resistor and the second DC source respectively, and dropping resistor and the second DC source connect, auxiliary contact link along with main contacts；Including: when needs the first DC source stops powering for electrical equipment, control to disconnect the voltage being applied to D.C. contactor coil two ends；The voltage at detection auxiliary contact two ends；If the voltage at auxiliary contact two ends is not setting voltage, then send the first alarm signal, in order to characterize the main contacts of D.C. contactor, adhesion fault occurs.The invention also discloses the detection device of a kind of high-voltage DC contactor main contacts fault.
Description
Technical field
The present invention relates to technical field of HVDC transmission, particularly relate to detection method and the device of a kind of high-voltage DC contactor main contacts fault.
Background technology
D.C. contactor is a kind of control electrical equipment utilizing the connection of low-voltage circuit distant control high direct voltage electric line and disjunction, it is mainly used in connecting at a distance and disjunction DC circuit, the frequent starting of dc motor can be realized by the break-make controlling DC circuit, stop, inverting and reversing braking, its solenoid etc. being also used for being frequently switched on and disconnect lifting electromagnet, electromagnetic valve, clutch.
The running voltage of D.C. contactor is relatively big, when using bad environments, frequent operation, often because of mechanical fatigue or moment electric arc, causes main contacts adhesion to disconnect.Described main contacts adhesion refer to should the contact of relative motion because of metal molten adhesion integral, generally caused by two kinds of reasons: 1) main contacts combines insufficient pressure, causes contact resistance to increase, during long-term work, at contact, heating causes metal molten；2) big electric current is by main contacts action while main contacts, forms electric arc, cause metal molten at contact between contact.
It addition, D.C. contactor also often because of mechanical fatigue or when dispatching from the factory mismachining tolerance normally opened compared with causing greatly main contacts, i.e. main contacts machinery is stuck, the phenomenon that cannot close.
Because D.C. contactor fault will result directly in electrical equipment and cannot work by demand, also can cause security incident, and need once to check whole electrical system during maintenance under special occasions, the troubleshooting time of cost is longer.If D.C. contactor duty can quickly be judged, then can when the system failure quick fault location, shorten the repair time, reduce the loss that brings because of fault.
But, prior art is only capable of judging to control the fault such as line broken circuit, short circuit, the specific fault such as the adhesion fault of relay main contacts or mechanical stuck fault cannot be monitored and judge, therefore, it is impossible to quickly, correctly determine failure cause and fault location.
Summary of the invention
In view of this, present invention is primarily targeted at detection method and the device that a kind of high-voltage DC contactor main contacts adhesion fault is provided, to realize accurately judging whether D.C. contactor main contacts sticks together or the purpose of mechanical stuck fault.
For achieving the above object, the invention provides the detection method of a kind of high-voltage DC contactor main contacts fault, it is characterized in that, the main contacts two ends of described D.C. contactor are connected with electrical equipment and the first DC source respectively, and described electrical equipment is connected with described first DC source；The auxiliary contact two ends of described D.C. contactor are connected with dropping resistor and the second DC source respectively, and described dropping resistor is connected with described second DC source, and described auxiliary contact link along with described main contacts, and described method includes:
When described first DC source of needs stops powering for described electrical equipment, control to disconnect the voltage being applied to described D.C. contactor coil two ends；
Detect the voltage at described auxiliary contact two ends；
If the voltage at described auxiliary contact two ends is not setting voltage, then send the first alarm signal, in order to characterize the business that the main contacts of described D.C. contactor occurs that adhesion fault, described setting voltage are described second direct current power source voltage and described dropping resistor.
Preferably, said method also includes:
When described electrical equipment needs work, control to connect the voltage being applied to described D.C. contactor coil two ends；
Detect the voltage at described auxiliary contact two ends；
If the voltage at described auxiliary contact two ends is described setting voltage, then send the second alarm signal, in order to characterize the main contacts of described D.C. contactor, mechanical stuck fault occurs.
Preferably, said method also includes:
When disconnecting the voltage being applied to described D.C. contactor coil two ends, if the voltage at described auxiliary contact two ends is described setting voltage, then send the first safety signal, in order to characterize the main contacts of described D.C. contactor, adhesion fault does not occurs.
Preferably, said method also includes:
When connecting the voltage being applied to described D.C. contactor coil two ends, if the voltage at described auxiliary contact two ends is not described setting voltage, then send the second safety signal, in order to characterize the main contacts of described D.C. contactor, mechanical stuck fault does not occurs.
Preferably, in the above-mentioned methods, between main contacts and the auxiliary contact of described D.C. contactor, it is provided with mechanical linkage, so that described auxiliary contact simultaneously engage with described main contacts or disconnect.
Present invention also offers the detection device of a kind of high-voltage DC contactor main contacts fault, it is characterised in that the main contacts two ends of described D.C. contactor are connected with electrical equipment and the first DC source respectively, described electrical equipment is connected with described first DC source；The auxiliary contact two ends of described D.C. contactor are connected with dropping resistor and the second DC source respectively, and described dropping resistor is connected with described second DC source, and described auxiliary contact link along with described main contacts, and described device includes:
First control unit, for when described first DC source of needs stops powering for described electrical equipment, controlling to disconnect the voltage being applied to described D.C. contactor coil two ends；
Detector unit, for detecting the voltage at described auxiliary contact two ends；
Whether judging unit, be setting voltage for judging the voltage at described auxiliary contact two ends, and described setting voltage is the business of described second direct current power source voltage and described dropping resistor；
First transmitting element, for when described judging unit judges the voltage at the described auxiliary contact two ends obtained not as setting voltage, sends the first alarm signal, adhesion fault occurs in order to characterize the main contacts of described D.C. contactor.
Preferably, said apparatus also includes:
Second control unit, for when described electrical equipment needs work, controls to connect the voltage being applied to described D.C. contactor coil two ends；
Described detector unit, is additionally operable to detect the voltage at described auxiliary contact two ends；
Described judging unit, is additionally operable to judge whether the voltage at described auxiliary contact two ends is setting voltage；
Second transmitting element, during for judging that at described judging unit the voltage at the described auxiliary contact two ends obtained is described setting voltage, sends the second alarm signal, mechanical stuck fault occurs in order to characterize the main contacts of described D.C. contactor.
Preferably, said apparatus also includes:
3rd transmitting element, for when disconnecting the voltage being applied to described D.C. contactor coil two ends, and described judging unit judges when the voltage at the described auxiliary contact two ends obtained is described setting voltage, send the first safety signal, in order to characterize the main contacts of described D.C. contactor, adhesion fault does not occurs.
Preferably, said apparatus also includes:
4th transmitting element, for when connecting the voltage being applied to described D.C. contactor coil two ends, and described judging unit judges that the voltage at the described auxiliary contact two ends obtained is not as described setting voltage, send the second safety signal, in order to characterize the main contacts of described D.C. contactor, mechanical stuck fault does not occurs.
Preferably, in said apparatus, between main contacts and the auxiliary contact of described D.C. contactor, it is provided with mechanical linkage, so that described auxiliary contact simultaneously engage with described main contacts or disconnect.
Visible, the detection method of high-voltage DC contactor main contacts fault of the present invention and device, when stop (needs) be described electrical equipment power time, the voltage at described D.C. contactor coil two ends it is applied to by controlling disconnection (joint), detect the voltage at described auxiliary contact two ends again, when the voltage at auxiliary contact two ends is zero (for setting voltage), show that the auxiliary contact that should be in disconnection (joint) state become joint (disconnection) state, and then would know that main contacts is also at engaging (disconnection) state, the i.e. main contacts of D.C. contactor occurs in that adhesion fault (mechanical stuck fault).Visible, utilize D.C. contactor main contacts-auxiliary contact link gear, by the adhesion fault (mechanical stuck fault) of D.C. contactor main contacts in low-voltage circuit is detected, just can determine whether out the working condition of current high-tension line, and judge the system failure without obtaining the high-voltage signal of output, the safety that the system that ensure that detects, reduce signal processing difficulty because using low-voltage signal simultaneously, reduce testing cost, and avoid electrical equipment itself is carried out fault detect.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structure principle chart of raw DC catalyst；
Fig. 2 is the structure principle chart of the improved D.C. contactor of the present invention；
Fig. 3 is the systematic schematic diagram that the present invention detects high-voltage DC contactor main contacts fault；
Fig. 4 is the schematic flow sheet of the embodiment 1 of the detection method of high-voltage DC contactor main contacts fault of the present invention；
Fig. 5 is the schematic flow sheet of the embodiment 2 of the detection method of high-voltage DC contactor main contacts fault of the present invention；
Fig. 6 is the structural representation of the embodiment 1 of the detection device of high-voltage DC contactor main contacts fault of the present invention；
Fig. 7 is the structural representation of the embodiment 2 of the detection device of high-voltage DC contactor main contacts fault of the present invention.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of protection of the invention.
Shown in Figure 1, Fig. 1 is the structure principle chart of raw DC catalyst, in high-voltage direct-current circuit, D.C. contactor is generally used to connect and disjunction circuit, when using bad environments, frequent operation, the main contacts 1 of D.C. contactor often occurs that adhesion fault causes system stalls, or D.C. contactor main contacts 1 often occurs that mechanical stuck fault causes circuit to be not turned on or operation irregularity.The present invention adds auxiliary contact and mechanical linkage on the basis of the raw DC catalyst shown in Fig. 1, obtain the improved D.C. contactor shown in Fig. 2, the structure principle chart of the improved D.C. contactor that Fig. 2 provides for the present invention, be provided with mechanical linkage between main contacts 1 and the auxiliary contact 2 of described D.C. contactor so that described auxiliary contact and described main contacts in combination with or disconnect.
Shown in Figure 3, the systematic schematic diagram of the detection high-voltage DC contactor main contacts fault that Fig. 3 provides for the present invention, the present invention increases D.C. contactor linkage auxiliary contact in original D.C. contactor, and devise corresponding control strategy to judge whether D.C. contactor exists fault, positive mechanical attachment means it is designed with between D.C. contactor auxiliary contact and main contacts, auxiliary contact and main contacts are linked all the time, i.e. auxiliary contact follow main contacts motion (main contacts engage, auxiliary contact simultaneously engage with；Main contacts disconnects, and auxiliary contact simultaneously switch off).
In the case of said system normally works, i.e. when electrical equipment needs work, apply the voltage of Ua=U1 ≠ 0 at D.C. contactor coil two ends, then main contacts engages, and auxiliary contact also simultaneously engage with, and now detect the voltage Ub=0 at the auxiliary contact two ends obtained；When needing to disconnect electrical equipment, apply the voltage of Ua=0 at D.C. contactor coil two ends, then main contacts disconnects, and auxiliary contact also simultaneously switch off, and now detect voltage Ub=U2 ≠ 0 at the auxiliary contact two ends obtained.
Shown in Figure 4, the schematic flow sheet of the embodiment 1 of the detection method of a kind of high-voltage DC contactor main contacts fault that Fig. 4 provides for the present invention, the main contacts two ends of described D.C. contactor are connected with electrical equipment and the first DC source respectively, and described electrical equipment is connected with described first DC source；The auxiliary contact two ends of described D.C. contactor are connected with dropping resistor and the second DC source respectively, and described dropping resistor is connected with described second DC source, and described auxiliary contact link along with described main contacts, it is achieved the step of described method is as follows:
Step 401: when needs the first DC source stops powering for described electrical equipment, control to disconnect the voltage Ua being applied to described D.C. contactor coil two ends, it is therefore an objective to make the main contacts of described D.C. contactor and auxiliary contact simultaneously switch off；
Control to disconnect the voltage Ua being applied to described D.C. contactor coil two ends shown in Fig. 3, it may be assumed that when disconnecting electrical equipment, the voltage at described coil two ends is become Ua=0 from Ua=U1.In normal operation, the main contacts of D.C. contactor and auxiliary contact should simultaneously switch off, voltage Ub=U2 ≠ 0 at auxiliary contact two ends.
Step 402: detect the voltage Ub at described auxiliary contact two ends；
Step 403: if the voltage at described auxiliary contact two ends is not setting voltage i.e. Ub=0 ≠ U2, then send the first alarm signal, in order to characterize the business that the main contacts of described D.C. contactor occurs that adhesion fault, described setting voltage are described second direct current power source voltage and described dropping resistor.
When disconnecting electrical equipment, after controlling to disconnect the voltage Ua being applied to D.C. contactor coil two ends, the main contacts of D.C. contactor under normal circumstances and auxiliary contact should simultaneously switch off, and when adhesion fault occurs in main contacts, i.e. main contacts will be in engagement state, and auxiliary contact are also at engagement state, now, when not being always 0 for setting voltage U2 by the voltage Ub at detection auxiliary contact two ends, i.e. can determine whether that adhesion fault occurs in main contacts.
The detection method of high-voltage DC contactor main contacts fault of the present invention, when stopping powering for described electrical equipment, the voltage at described D.C. contactor coil two ends it is applied to by controlling disconnection, detect the voltage at described auxiliary contact two ends again, when the voltage at auxiliary contact two ends is zero, show that the auxiliary contact that should be off become engagement state, and then would know that main contacts is also at engagement state, i.e. the main contacts of D.C. contactor occurs in that adhesion fault.Visible, utilize D.C. contactor main contacts-auxiliary contact link gear, by the adhesion fault of D.C. contactor main contacts in low-voltage circuit is detected, just can determine whether out the working condition of current high-tension line, and judge the system failure without obtaining the high-voltage signal of output, it is ensured that and the safety of system detection, reduce signal processing difficulty because using low-voltage signal simultaneously, reduce testing cost, and avoid electrical equipment itself is carried out fault detect.
Shown in Figure 5, the schematic flow sheet of the embodiment 2 of the detection method of a kind of high-voltage DC contactor main contacts fault that Fig. 5 provides for the present invention, the main contacts two ends of described D.C. contactor are connected with electrical equipment and the first DC source respectively, and described electrical equipment is connected with described first DC source；The auxiliary contact two ends of described D.C. contactor are connected with dropping resistor and the second DC source respectively, and described dropping resistor is connected with described second DC source, and described auxiliary contact link along with described main contacts, it is achieved the step of described method is as follows:
Step 501: judge whether to need to power for electrical equipment, if it is not, then execution step 502 is to step 506, if it is, perform step 507 to step 511.
Step 502: control to disconnect the voltage Ua being applied to described D.C. contactor coil two ends, it is therefore an objective to make the main contacts of described D.C. contactor and auxiliary contact simultaneously switch off；
Step 503: detect the voltage Ub at described auxiliary contact two ends；
Step 504: judge whether the voltage at described auxiliary contact two ends is whether setting voltage i.e. Ub is equal to U2, if, then show that main contacts and auxiliary contact are simultaneously in off-state, perform step 505, if not, then show that main contacts and auxiliary contact are simultaneously in engagement state, then perform step 506；
, there is not adhesion fault in order to characterize the main contacts of described D.C. contactor in step 505: send the first safety signal.
When adhesion fault does not occurs in main contacts, main contacts is off, and auxiliary contact link with main contacts, i.e. auxiliary contact are also at off-state；It is off by detection auxiliary contact, i.e. can determine whether that main contacts is also at off-state.
, there is adhesion fault in order to characterize the main contacts of described D.C. contactor in step 506: send the first alarm signal.
Step 507: control to connect the voltage Ua being applied to described D.C. contactor coil two ends, it is therefore an objective to make the main contacts of described D.C. contactor and auxiliary contact simultaneously engage with；
Step 508: detect the voltage at described auxiliary contact two ends；
Step 509: judge whether the voltage at described auxiliary contact two ends is whether setting voltage i.e. Ub is equal to U2, if it is, show that main contacts and auxiliary contact are simultaneously in off-state, perform step 510, if it is not, then show that main contacts and auxiliary contact are simultaneously in engagement state, perform step 511；
, there is mechanical stuck fault in order to characterize the main contacts of described D.C. contactor in step 510: send the second alarm signal.
When connecting electrical equipment, after controlling to connect the voltage Ua being applied to D.C. contactor coil two ends, the main contacts of D.C. contactor under normal circumstances and auxiliary contact should simultaneously engage with, and when mechanical stuck fault occurs in main contacts, i.e. main contacts will be off, and auxiliary contact are also at off-state, now, by detection auxiliary contact two ends voltage Ub be not 0 be always setting voltage U2 time, i.e. can determine whether main contacts occur mechanical stuck fault.
, there is not mechanical stuck fault in order to characterize the main contacts of described D.C. contactor in step 511: send the second safety signal.
When mechanical stuck fault does not occurs in main contacts, main contacts is in engagement state, and auxiliary contact link with main contacts, i.e. auxiliary contact are also at engagement state；It is in engagement state by detection auxiliary contact, i.e. can determine whether that main contacts is also at engagement state.
The detection method of high-voltage DC contactor main contacts fault of the present invention, when needs are powered for described electrical equipment, the voltage at described D.C. contactor coil two ends it is applied to by controlling connection, detect the voltage at described auxiliary contact two ends again, when the voltage at auxiliary contact two ends is setting voltage, show that the auxiliary contact that should be in engagement state become off-state, and then would know that main contacts is also at off-state, by the voltage at auxiliary contact two ends is detected, can quickly judge that mechanical stuck fault occurs in the main contacts of D.C. contactor.
Shown in Figure 6, the structural representation of the embodiment 1 of the detection device of a kind of high-voltage DC contactor main contacts fault that Fig. 6 provides for the present invention, the main contacts two ends of described D.C. contactor are connected with electrical equipment and the first DC source respectively, and described electrical equipment is connected with described first DC source；The auxiliary contact two ends of described D.C. contactor are connected with dropping resistor and the second DC source respectively, and described dropping resistor is connected with described second DC source, and described auxiliary contact link along with described main contacts, and described device includes:
First control unit 1, for when described first DC source of needs stops powering for described electrical equipment, controlling to disconnect the voltage being applied to described D.C. contactor coil two ends；Detector unit 2, for detecting the voltage at described auxiliary contact two ends；Whether judging unit 3, be setting voltage for judging the voltage at described auxiliary contact two ends, and described setting voltage is the business of described second direct current power source voltage and described dropping resistor；First transmitting element 4, for when described judging unit 3 judges the voltage at the described auxiliary contact two ends obtained not as setting voltage, sends the first alarm signal, adhesion fault occurs in order to characterize the main contacts of described D.C. contactor.
It addition, be provided with mechanical linkage between the main contacts of described D.C. contactor and auxiliary contact so that described auxiliary contact and described main contacts in combination with or disconnect.
The detection device of high-voltage DC contactor main contacts fault of the present invention, when stopping powering for described electrical equipment, the voltage at described D.C. contactor coil two ends it is applied to by controlling disconnection, detect the voltage at described auxiliary contact two ends again, when the voltage at auxiliary contact two ends is zero, show that the auxiliary contact that should be off become engagement state, and then would know that main contacts is also at engagement state, i.e. the main contacts of D.C. contactor occurs in that adhesion fault.Visible, utilize D.C. contactor main contacts-auxiliary contact link gear, by the adhesion fault of D.C. contactor main contacts in low-voltage circuit is detected, just can determine whether out the working condition of current high-tension line, and judge the system failure without obtaining the high-voltage signal of output, it is ensured that and the safety of system detection, reduce signal processing difficulty because using low-voltage signal simultaneously, reduce testing cost, and avoid electrical equipment itself is carried out fault detect.
Shown in Figure 7, the structural representation of the embodiment 2 of the detection device of a kind of high-voltage DC contactor main contacts fault that Fig. 7 provides for the present invention, the main contacts two ends of described D.C. contactor are connected with electrical equipment and the first DC source respectively, and described electrical equipment is connected with described first DC source；The auxiliary contact two ends of described D.C. contactor are connected with dropping resistor and the second DC source respectively, and described dropping resistor is connected with described second DC source, and described auxiliary contact link along with described main contacts, and described device includes:
First control unit 1, for when described first DC source of needs stops powering for described electrical equipment, controlling to disconnect the voltage being applied to described D.C. contactor coil two ends；Detector unit 2, for detecting the voltage at described auxiliary contact two ends；Whether judging unit 3, be setting voltage for judging the voltage at described auxiliary contact two ends；First transmitting element 4, during for judging that at described judging unit 3 voltage at the described auxiliary contact two ends obtained is not as setting voltage, send the first alarm signal, in order to characterize the main contacts of described D.C. contactor, adhesion fault occurs, 3rd transmitting element 5, for being applied to the voltage at described D.C. contactor coil two ends when disconnecting, and described judging unit 3 judges, when the voltage at the described auxiliary contact two ends obtained is described setting voltage, to send the first safety signal.Second control unit 6, for when electrical equipment needs work, controls to connect the voltage being applied to described D.C. contactor coil two ends；Described detector unit 2, is additionally operable to detect the voltage at described auxiliary contact two ends；Described judging unit 3, is additionally operable to judge whether the voltage at described auxiliary contact two ends is setting voltage；Second transmitting element 7, during for judging that at described judging unit 3 voltage at the described auxiliary contact two ends obtained is described setting voltage, send the second alarm signal, in order to characterize the main contacts of described D.C. contactor, mechanical stuck fault occurs, 4th transmitting element 8, for when connecting the voltage being applied to described D.C. contactor coil two ends, and described judging unit 3 judges that the voltage at the described auxiliary contact two ends obtained is not as described setting voltage, send the second safety signal, in order to characterize the main contacts of described D.C. contactor, mechanical stuck fault does not occurs.
The detection device of high-voltage DC contactor main contacts fault of the present invention, when needs are powered for described electrical equipment, the voltage at described D.C. contactor coil two ends it is applied to by controlling connection, detect the voltage at described auxiliary contact two ends again, when the voltage at auxiliary contact two ends is setting voltage, show that the auxiliary contact that should be in engagement state become off-state, and then would know that main contacts is also at off-state, by the voltage at auxiliary contact two ends is detected, can quickly judge that mechanical stuck fault occurs in the main contacts of D.C. contactor.
It can further be stated that, in this article, the relational terms of such as first and second or the like is used merely to separate an entity or operation with another entity or operating space, and not necessarily requires or imply the relation or sequentially that there is any this reality between these entities or operation.And, term " includes ", " comprising " or its any other variant are intended to comprising of nonexcludability, so that include that the process of a series of key element, method, article or equipment not only include those key elements, but also include other key elements being not expressly set out, or also include the key element intrinsic for this process, method, article or equipment.In the case of there is no more restriction, statement " including ... " key element limited, it is not excluded that there is also other identical element in including the process of described key element, method, article or equipment.
The method described in conjunction with the embodiments described herein or the step of algorithm can directly use the software module that hardware, processor perform, or the combination of the two is implemented.In any other form of storage medium that software module is known in can being placed in random access memory (RAM), internal memory, read only memory (ROM), electrically programmable ROM, electrically erasable ROM, depositor, hard disk, moveable magnetic disc, CD-ROM or technical field.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.Multiple amendment to these embodiments will be apparent from for those skilled in the art, and generic principles defined herein can realize without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein, and is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (10)
1. the detection method of a high-voltage DC contactor main contacts fault, it is characterised in that described directly
The main contacts two ends of stream catalyst are connected with electrical equipment and the first DC source respectively, described electrical equipment
It is connected with described first DC source；The auxiliary contact two ends of described D.C. contactor respectively with dropping resistor
Connecting with the second DC source, described dropping resistor is connected with described second DC source, and described auxiliary is touched
Point links along with described main contacts, and described method includes:
When described first DC source of needs stops powering for described electrical equipment, control disconnection and be applied to
The voltage at described D.C. contactor coil two ends；
Detect the voltage at described auxiliary contact two ends；
If the voltage at described auxiliary contact two ends is not setting voltage, then send the first alarm signal, use
Occur that adhesion fault, described setting voltage are that auxiliary contact break with the main contacts of the described D.C. contactor of sign
When opening, the difference of the voltage drop of described second direct current power source voltage and described dropping resistor.
Method the most according to claim 1, it is characterised in that described method also includes:
When described electrical equipment needs work, control connection and be applied to described D.C. contactor coil two ends
Voltage；
Detect the voltage at described auxiliary contact two ends；
If the voltage at described auxiliary contact two ends is described setting voltage, then send the second alarm signal,
In order to characterize the main contacts of described D.C. contactor, mechanical stuck fault occurs.
Method the most according to claim 1, it is characterised in that described method also includes:
When disconnecting the voltage being applied to described D.C. contactor coil two ends, if described auxiliary contact two
The voltage of end is described setting voltage, then send the first safety signal, in order to characterize described D.C. contactor
Main contacts adhesion fault does not occurs.
Method the most according to claim 2, it is characterised in that described method also includes:
When connecting the voltage being applied to described D.C. contactor coil two ends, if described auxiliary contact two
The voltage of end is not described setting voltage, then send the second safety signal, in order to characterize the contact of described direct current
There is not mechanical stuck fault in the main contacts of device.
5. according to the method described in any one of Claims 1-4, it is characterised in that described direct current connects
It is provided with mechanical linkage between main contacts and the auxiliary contact of tentaculum, so that described auxiliary contact and institute
State main contacts simultaneously engage with or disconnect.
6. the detection device of a high-voltage DC contactor main contacts fault, it is characterised in that described direct current
The main contacts two ends of catalyst are connected with electrical equipment and the first DC source respectively, described electrical equipment with
Described first DC source connects；The auxiliary contact two ends of described D.C. contactor respectively with dropping resistor and
Second DC source connects, and described dropping resistor is connected with described second DC source, described auxiliary contact
Along with described main contacts links, described device includes:
First control unit, for when needing described first DC source to stop powering for described electrical equipment
Time, control to disconnect the voltage being applied to described D.C. contactor coil two ends；
Detector unit, for detecting the voltage at described auxiliary contact two ends；
Judging unit, for judging whether the voltage at described auxiliary contact two ends is setting voltage, described in set
Determining voltage is auxiliary contact when disconnecting, the voltage drop of described second direct current power source voltage and described dropping resistor
Difference；
First transmitting element, for judging the electricity at the described auxiliary contact two ends obtained at described judging unit
When pressure is not setting voltage, send the first alarm signal, in order to characterize the main contacts of described D.C. contactor
Adhesion fault occurs.
Device the most according to claim 6, it is characterised in that described device also includes:
Second control unit, for when described electrical equipment needs work, controls connection and is applied to described
The voltage at D.C. contactor coil two ends；
Described detector unit, is additionally operable to detect the voltage at described auxiliary contact two ends；
Described judging unit, is additionally operable to judge whether the voltage at described auxiliary contact two ends is setting voltage；
Second transmitting element, for judging the electricity at the described auxiliary contact two ends obtained at described judging unit
When pressure is for described setting voltage, send the second alarm signal, touch in order to characterize the master of described D.C. contactor
There is mechanical stuck fault in point.
Device the most according to claim 6, it is characterised in that described device also includes:
3rd transmitting element, for being applied to the voltage at described D.C. contactor coil two ends when disconnection, and
Described judging unit judges, when the voltage at the described auxiliary contact two ends obtained is described setting voltage, to send
, there is not adhesion fault in order to characterize the main contacts of described D.C. contactor in first safety signal.
Device the most according to claim 7, it is characterised in that described device also includes:
4th transmitting element, for being applied to the voltage at described D.C. contactor coil two ends when connection, and
Described judging unit judges that the voltage at the described auxiliary contact two ends obtained is not as described setting voltage, transmission
, there is not mechanical stuck fault in order to characterize the main contacts of described D.C. contactor in second safety signal.
10. according to the device described in any one of claim 6 to 9, it is characterised in that described direct current connects
It is provided with mechanical linkage between main contacts and the auxiliary contact of tentaculum, so that described auxiliary contact and institute
State main contacts simultaneously engage with or disconnect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210374273.3A CN102890237B (en) | 2012-09-27 | 2012-09-27 | The detection method of a kind of high-voltage DC contactor main contacts fault and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210374273.3A CN102890237B (en) | 2012-09-27 | 2012-09-27 | The detection method of a kind of high-voltage DC contactor main contacts fault and device |
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