CN102890237A - Method and device for detecting faults of main touch point of high-voltage direct-current contact - Google Patents
Method and device for detecting faults of main touch point of high-voltage direct-current contact Download PDFInfo
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- CN102890237A CN102890237A CN2012103742733A CN201210374273A CN102890237A CN 102890237 A CN102890237 A CN 102890237A CN 2012103742733 A CN2012103742733 A CN 2012103742733A CN 201210374273 A CN201210374273 A CN 201210374273A CN 102890237 A CN102890237 A CN 102890237A
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Abstract
The invention discloses a method for detecting faults of a main touch point of a high-voltage direct-current contact. Two ends of the main touch point of the direct-current contact are respectively connected with a piece of electric equipment and a first direct-current power supply; the electric equipment is connected with the first direct-current power supply; two ends of an auxiliary touch point of the direct-current contact are respectively connected with a dropping resistor and a second direct-current power supply; the dropping resistor is connected with the second direct-current power supply; the auxiliary touch point is linked with the main touch point; the method comprises the following steps of: when the first direct-current power supply needs to stop supplying power to the electric equipment, controlling to power off the voltages exerted to two ends of a direct-current contact coil; detecting the voltages at two ends of the auxiliary touch point; and if the voltages at the two ends of the auxiliary touch point are not set voltages, transmitting a first alarming signal to represent that the main touch point of the direct-current contact has adhesion faults. The invention also discloses a device for detecting the faults of the main touch point of the high-voltage direct-current contact.
Description
Technical field
The present invention relates to the high voltage dc transmission technology field, relate in particular to a kind of detection method and device of high-voltage DC contactor main contacts fault.
Background technology
D.C. contactor is a kind of control apparatus that utilizes the connection of low-voltage circuit far distance controlled high direct voltage electric line and disjunction, be mainly used in remote the connection and the disjunction DC circuit, by the break-make of control DC circuit can realize direct current motor frequent starting, stop, counter-rotating and reversing braking, it also is used for switching on and off continually the solenoid etc. of lifting electromagnet, solenoid valve, clutch coupling.
The operating voltage of D.C. contactor is larger, during, frequent operation abominable in environment for use, often because of mechanical fatigue or moment electric arc, cause the main contacts adhesion to disconnect.Described main contacts adhesion refers to and should be integral because of the metal molten adhesion relatively movable contact, is usually caused by two kinds of reasons: 1) main contacts causes contact resistance to increase in conjunction with insufficient pressure, and the heating of place, contact causes metal molten during long-term work; The main contacts action formed electric arc when 2) large electric current was by main contacts between the contact, caused place, contact metal molten.
In addition, D.C. contactor also often because of mechanical fatigue or when dispatching from the factory mismachining tolerance cause more greatly main contacts often to be opened, namely main contacts machinery stuck, can't closed phenomenon.
Because the D.C. contactor fault will directly cause consumer also can cause security incident under special occasions by demand work, and maintenance the time need to once check whole electrical system, and the troubleshooting time of cost is longer.If can judge fast the D.C. contactor duty, then can when the system failure, locate fast abort situation, shorten the repair time, reduce to hinder for some reason the loss that brings.
But, the prior art scheme only can be judged the faults such as operation circuit opens circuit, short circuit, can't monitor and judge specific fault such as the adhesion fault of relay main contacts or mechanical stuck faults, therefore, can't fast, correctly determine failure cause and location abort situation.
Summary of the invention
In view of this, fundamental purpose of the present invention is to provide a kind of detection method and device of high-voltage DC contactor main contacts adhesion fault, to realize judging accurately whether the D.C. contactor main contacts sticks together or the purpose of mechanical stuck fault.
For achieving the above object, the invention provides a kind of detection method of high-voltage DC contactor main contacts fault, it is characterized in that, the main contacts two ends of described D.C. contactor respectively with consumer be connected direct supply and be connected, described consumer is connected with described the first direct supply; The auxiliary contact two ends of described D.C. contactor respectively with dropping resistor be connected direct supply and be connected, described dropping resistor is connected with described the second direct supply, described auxiliary contact are along with described main contacts links, described method comprises:
When described the first direct supply of needs stopped as described consumer power supply, control disconnected the voltage that is 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 alerting signal, adhesion fault appears in order to the main contacts that characterizes described D.C. contactor, and described setting voltage is the merchant of described the second direct supply voltage and described dropping resistor.
Preferably, said method also comprises:
When described consumer needed work, the voltage that is applied to described D.C. contactor coil two ends was connected in control;
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 alerting signal, mechanical stuck fault appears in order to the main contacts that characterizes described D.C. contactor.
Preferably, said method also comprises:
When disconnection is applied to the voltage at 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, adhesion fault does not appear in order to the main contacts that characterizes described D.C. contactor.
Preferably, said method also comprises:
When connection is applied to the voltage at 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, mechanical stuck fault does not appear in order to the main contacts that characterizes described D.C. contactor.
Preferably, in said method, be provided with mechanical linkage between the main contacts of described D.C. contactor and the auxiliary contact, so that described auxiliary contact engage simultaneously with described main contacts or disconnect.
The present invention also provides a kind of pick-up unit of high-voltage DC contactor main contacts fault, it is characterized in that, the main contacts two ends of described D.C. contactor respectively with consumer be connected direct supply and be connected, described consumer is connected with described the first direct supply; The auxiliary contact two ends of described D.C. contactor respectively with dropping resistor be connected direct supply and be connected, described dropping resistor is connected with described the second direct supply, described auxiliary contact are along with described main contacts links, described device comprises:
The first control module is used for when described the first direct supply of needs stops as described consumer power supply, and control disconnects the voltage that is applied to described D.C. contactor coil two ends;
Detecting unit is for detection of the voltage at described auxiliary contact two ends;
Judging unit is used for judging whether the voltage at described auxiliary contact two ends is setting voltage, and described setting voltage is the merchant of described the second direct supply voltage and described dropping resistor;
The first transmitting element when being not setting voltage for the voltage at the described auxiliary contact two ends that described judgment unit judges obtains, sends the first alerting signal, adhesion fault occurs in order to the main contacts that characterizes described D.C. contactor.
Preferably, said apparatus also comprises:
The second control module is used for when described consumer needs work, and the voltage that is applied to described D.C. contactor coil two ends is connected in control;
Described detecting unit is also for detection of the voltage at described auxiliary contact two ends;
Described judging unit also is used for judging whether the voltage at described auxiliary contact two ends is setting voltage;
The second transmitting element when being described setting voltage for the voltage at the described auxiliary contact two ends that described judgment unit judges obtains, sends the second alerting signal, mechanical stuck fault occurs in order to the main contacts that characterizes described D.C. contactor.
Preferably, said apparatus also comprises:
The 3rd transmitting element, be used for being applied to when disconnection the voltage at described D.C. contactor coil two ends, and when the voltage at the described auxiliary contact two ends that described judgment unit judges obtains is described setting voltage, send the first safety signal, adhesion fault do not occur in order to the main contacts that characterizes described D.C. contactor.
Preferably, said apparatus also comprises:
The 4th transmitting element, be used for being applied to when connection the voltage at described D.C. contactor coil two ends, and the voltage at the described auxiliary contact two ends that described judgment unit judges obtains is not described setting voltage, send the second safety signal, mechanical stuck fault do not occur in order to the main contacts that characterizes described D.C. contactor.
Preferably, in said apparatus, be provided with mechanical linkage between the main contacts of described D.C. contactor and the auxiliary contact, so that described auxiliary contact engage simultaneously with described main contacts or disconnect.
As seen, detection method and the device of high-voltage DC contactor main contacts fault of the present invention, when stopping (needs) for described consumer power supply, disconnect the voltage that (joint) is applied to described D.C. contactor coil two ends by control, detect again the voltage at described auxiliary contact two ends, 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 have become joint (disconnection) state, and then can know that main contacts also is in joint (disconnection) state, namely adhesion fault (mechanical stuck fault) has appearred in the main contacts of D.C. contactor.As seen, utilize D.C. contactor main contacts-auxiliary contact link gear, detect by the adhesion fault (mechanical stuck fault) to D.C. contactor main contacts in the low-voltage circuit, just can judge the working condition of current high-tension line, and the high-voltage signal that need not to obtain output is judged the system failure, and the security that the system that guaranteed detects is simultaneously because adopting low-voltage signal to reduce the signal intractability, reduced testing cost, and avoided consumer itself is carried out fault detect.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structure principle chart of original D.C. contactor;
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 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 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 embodiment 1 of the pick-up unit of high-voltage DC contactor main contacts fault of the present invention;
Fig. 7 is the structural representation of embodiment 2 of the pick-up unit of high-voltage DC contactor main contacts fault of the present invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Referring to shown in Figure 1, Fig. 1 is the structure principle chart of original D.C. contactor, in the high-voltage direct-current circuit, usually connect with D.C. contactor and minute deenergizing, during, frequent operation abominable in environment for use, the main contacts 1 of D.C. contactor often adhesion fault occurs and causes system to quit work, or the mechanical stuck fault of D.C. contactor main contacts 1 frequent appearance causes circuit can't connect or operation irregularity.The present invention adds auxiliary contact and mechanical linkage on the basis of original D.C. contactor shown in Figure 1, obtain improved D.C. contactor shown in Figure 2, Fig. 2 is the structure principle chart of improved D.C. contactor provided by the invention, be provided with mechanical linkage between the main contacts 1 of described D.C. contactor and the auxiliary contact 2, so that the simultaneously combination of described auxiliary contact and described main contacts or disconnection.
Referring to shown in Figure 3, Fig. 3 is the systematic schematic diagram of detection high-voltage DC contactor main contacts fault provided by the invention, the present invention increases D.C. contactor interlock auxiliary contact in original D.C. contactor, and designed corresponding control strategy and judged whether D.C. contactor exists fault, between D.C. contactor auxiliary contact and main contacts, be designed with the positive mechanical coupling arrangement, so that auxiliary contact and main contacts link all the time, be that auxiliary contact are followed main contacts motion (main contacts is engaged, and auxiliary contact engage simultaneously; Main contacts disconnects, and auxiliary contact disconnect simultaneously).
In the situation that said system normal operation, namely when consumer needs work, apply the voltage of Ua=U1 ≠ 0 at D.C. contactor coil two ends, then main contacts engages, auxiliary contact also engage simultaneously, detect the voltage U b=0 at the auxiliary contact two ends that obtain this moment; In the time of need to disconnecting consumer, apply the voltage of Ua=0 at D.C. contactor coil two ends, then main contacts disconnects, and auxiliary contact also disconnect simultaneously, the voltage U b=U2 at the auxiliary contact two ends that at this moment detection obtains ≠ 0.
Referring to shown in Figure 4, Fig. 4 is the schematic flow sheet of embodiment 1 of the detection method of a kind of high-voltage DC contactor main contacts fault provided by the invention, the main contacts two ends of described D.C. contactor respectively with consumer be connected direct supply and be connected, described consumer is connected with described the first direct supply; The auxiliary contact two ends of described D.C. contactor respectively with dropping resistor be connected direct supply and be connected, described dropping resistor is connected with described the second direct supply, described auxiliary contact are along with described main contacts links,, realize that the step of described method is as follows:
Step 401: when needs the first direct supply stopped as described consumer power supply, control disconnected the voltage U a that is applied to described D.C. contactor coil two ends, and purpose is that the main contacts of described D.C. contactor and auxiliary contact are disconnected simultaneously;
Control disconnects the voltage U a that is applied to described D.C. contactor coil two ends shown in Figure 3, that is: when disconnecting consumer, the voltage at described coil two ends becomes Ua=0 by Ua=U1.In normal operation, the main contacts of D.C. contactor and auxiliary contact should disconnect simultaneously, the voltage U b=U2 at auxiliary contact two ends ≠ 0.
Step 402: the voltage U b that detects described auxiliary contact two ends;
Step 403: if the voltage at described auxiliary contact two ends is not Ub=0 ≠ U2 for setting voltage, then send the first alerting signal, adhesion fault occurs in order to the main contacts that characterizes described D.C. contactor, described setting voltage is the merchant of described the second direct supply voltage and described dropping resistor.
When disconnecting consumer, after control disconnects and is applied to the voltage U a at D.C. contactor coil two ends, the main contacts of D.C. contactor under normal circumstances and auxiliary contact should disconnect simultaneously, and when adhesion fault appears in main contacts, be that main contacts will be in engagement state, auxiliary contact also are in engagement state, at this moment, voltage U b by detecting the auxiliary contact two ends can judge that not for setting voltage U2 is always at 0 o'clock adhesion fault appears in main contacts.
The detection method of high-voltage DC contactor main contacts fault of the present invention, when stopping as described consumer power supply, disconnect the voltage that is applied to described D.C. contactor coil two ends by control, detect again the voltage at described auxiliary contact two ends, when the voltage at auxiliary contact two ends is zero, show that the auxiliary contact that should be in off-state have become engagement state, and then can know that main contacts also is in engagement state, namely adhesion fault has appearred in the main contacts of D.C. contactor.As seen, utilize D.C. contactor main contacts-auxiliary contact link gear, detect by the adhesion fault to D.C. contactor main contacts in the low-voltage circuit, just can judge the working condition of current high-tension line, and the high-voltage signal that need not to obtain output is judged the system failure, and the security that the system that guaranteed detects is simultaneously because adopting low-voltage signal to reduce the signal intractability, reduced testing cost, and avoided consumer itself is carried out fault detect.
Referring to shown in Figure 5, Fig. 5 is the schematic flow sheet of embodiment 2 of the detection method of a kind of high-voltage DC contactor main contacts fault provided by the invention, the main contacts two ends of described D.C. contactor respectively with consumer be connected direct supply and be connected, described consumer is connected with described the first direct supply; The auxiliary contact two ends of described D.C. contactor respectively with dropping resistor be connected direct supply and be connected, described dropping resistor is connected with described the second direct supply, described auxiliary contact realize that along with described main contacts links the step of described method is as follows:
Step 501: judge whether and need to power for consumer, if not, then execution in step 502 is to step 506, and if so, then execution in step 507 is to step 511.
Step 502: control disconnects the voltage U a that is applied to described D.C. contactor coil two ends, and purpose is that the main contacts of described D.C. contactor and auxiliary contact are disconnected simultaneously;
Step 503: the voltage U b that detects described auxiliary contact two ends;
Step 504: whether the voltage of judging described auxiliary contact two ends is that setting voltage is whether Ub equals U2, if, show that then main contacts and auxiliary contact are in off-state simultaneously, execution in step 505, if not, show that then main contacts and auxiliary contact are in engagement state simultaneously, then execution in step 506;
Step 505: send the first safety signal, adhesion fault do not occur in order to the main contacts that characterizes described D.C. contactor.
When adhesion fault did not appear in main contacts, main contacts was in off-state, and auxiliary contact link with main contacts, and namely auxiliary contact also are in off-state; Be in off-state by detecting auxiliary contact, can judge that main contacts also is in off-state.
Step 506: send the first alerting signal, adhesion fault occurs in order to the main contacts that characterizes described D.C. contactor.
Step 507: the voltage U a that is applied to described D.C. contactor coil two ends is connected in control, and purpose is that the main contacts of described D.C. contactor and auxiliary contact are engaged simultaneously;
Step 508: the voltage that detects described auxiliary contact two ends;
Step 509: whether the voltage of judging described auxiliary contact two ends is that setting voltage is whether Ub equals U2, if, show that then main contacts and auxiliary contact are in off-state simultaneously, execution in step 510, if not, show that then main contacts and auxiliary contact are in engagement state simultaneously, execution in step 511;
Step 510: send the second alerting signal, mechanical stuck fault occurs in order to the main contacts that characterizes described D.C. contactor.
When connecting consumer, after control is connected and is applied to the voltage U a at D.C. contactor coil two ends, the main contacts of D.C. contactor under normal circumstances and auxiliary contact should engage simultaneously, and when mechanical stuck fault appears in main contacts, be that main contacts will be in off-state, auxiliary contact also are in off-state, at this moment, be not 0 when being always setting voltage U2 by the voltage U b that detects the auxiliary contact two ends, can judge that mechanical stuck fault appears in main contacts.
Step 511: send the second safety signal, mechanical stuck fault do not occur in order to the main contacts that characterizes described D.C. contactor.
When mechanical stuck fault did not appear in main contacts, main contacts was in engagement state, and auxiliary contact link with main contacts, and namely auxiliary contact also are in engagement state; Be in engagement state by detecting auxiliary contact, can judge that main contacts also is in engagement state.
The detection method of high-voltage DC contactor main contacts fault of the present invention, when needs are powered for described consumer, connect the voltage that is applied to described D.C. contactor coil two ends by control, detect again the voltage at described auxiliary contact two ends, when the voltage at auxiliary contact two ends is setting voltage, show that the auxiliary contact that should be in engagement state have become off-state, and then can know that main contacts also is in off-state, detect by the voltage to the auxiliary contact two ends, can judge fast that mechanical stuck fault appears in the main contacts of D.C. contactor.
Referring to shown in Figure 6, Fig. 6 is the structural representation of embodiment 1 of the pick-up unit of a kind of high-voltage DC contactor main contacts fault provided by the invention, the main contacts two ends of described D.C. contactor respectively with consumer be connected direct supply and be connected, described consumer is connected with described the first direct supply; The auxiliary contact two ends of described D.C. contactor respectively with dropping resistor be connected direct supply and be connected, described dropping resistor is connected with described the second direct supply, described auxiliary contact are along with described main contacts links, described device comprises:
The first control module 1 is used for when described the first direct supply of needs stops as described consumer power supply, and control disconnects the voltage that is applied to described D.C. contactor coil two ends; Detecting unit 2 is for detection of the voltage at described auxiliary contact two ends; Judging unit 3 is used for judging whether the voltage at described auxiliary contact two ends is setting voltage, and described setting voltage is the merchant of described the second direct supply voltage and described dropping resistor; The first transmitting element 4 is used for sending the first alerting signal when described judging unit 3 judges that the voltage at the described auxiliary contact two ends that obtain is not setting voltage, adhesion fault occurs in order to the main contacts that characterizes described D.C. contactor.
In addition, be provided with mechanical linkage between the main contacts of described D.C. contactor and the auxiliary contact, so that the simultaneously combination of described auxiliary contact and described main contacts or disconnection.
The pick-up unit of high-voltage DC contactor main contacts fault of the present invention, when stopping as described consumer power supply, disconnect the voltage that is applied to described D.C. contactor coil two ends by control, detect again the voltage at described auxiliary contact two ends, when the voltage at auxiliary contact two ends is zero, show that the auxiliary contact that should be in off-state have become engagement state, and then can know that main contacts also is in engagement state, namely adhesion fault has appearred in the main contacts of D.C. contactor.As seen, utilize D.C. contactor main contacts-auxiliary contact link gear, detect by the adhesion fault to D.C. contactor main contacts in the low-voltage circuit, just can judge the working condition of current high-tension line, and the high-voltage signal that need not to obtain output is judged the system failure, and the security that the system that guaranteed detects is simultaneously because adopting low-voltage signal to reduce the signal intractability, reduced testing cost, and avoided consumer itself is carried out fault detect.
Referring to shown in Figure 7, Fig. 7 is the structural representation of embodiment 2 of the pick-up unit of a kind of high-voltage DC contactor main contacts fault provided by the invention, the main contacts two ends of described D.C. contactor respectively with consumer be connected direct supply and be connected, described consumer is connected with described the first direct supply; The auxiliary contact two ends of described D.C. contactor respectively with dropping resistor be connected direct supply and be connected, described dropping resistor is connected with described the second direct supply, described auxiliary contact are along with described main contacts links, described device comprises:
The first control module 1 is used for when described the first direct supply of needs stops as described consumer power supply, and control disconnects the voltage that is applied to described D.C. contactor coil two ends; Detecting unit 2 is for detection of the voltage at described auxiliary contact two ends; Judging unit 3 is used for judging whether the voltage at described auxiliary contact two ends is setting voltage; The first transmitting element 4, be used for when described judging unit 3 judges that the voltage at the described auxiliary contact two ends that obtain is not setting voltage, send the first alerting signal, adhesion fault appears in order to the main contacts that characterizes described D.C. contactor, the 3rd transmitting element 5, be used for the voltage that is applied to 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 that obtain is described setting voltage, send the first safety signal.The second control module 6 is used for when consumer needs work, and the voltage that is applied to described D.C. contactor coil two ends is connected in control; Described detecting unit 2 is also for detection of the voltage at described auxiliary contact two ends; Described judging unit 3 also is used for judging whether the voltage at described auxiliary contact two ends is setting voltage; The second transmitting element 7, be used for when described judging unit 3 judges that the voltage at the described auxiliary contact two ends that obtain is described setting voltage, send the second alerting signal, mechanical stuck fault appears in order to the main contacts that characterizes described D.C. contactor, the 4th transmitting element 8, be used for being applied to when connection the voltage at described D.C. contactor coil two ends, and described judging unit 3 judges that the voltage at the described auxiliary contact two ends that obtain is not described setting voltage, send the second safety signal, mechanical stuck fault do not occur in order to the main contacts that characterizes described D.C. contactor.
The pick-up unit of high-voltage DC contactor main contacts fault of the present invention, when needs are powered for described consumer, connect the voltage that is applied to described D.C. contactor coil two ends by control, detect again the voltage at described auxiliary contact two ends, when the voltage at auxiliary contact two ends is setting voltage, show that the auxiliary contact that should be in engagement state have become off-state, and then can know that main contacts also is in off-state, detect by the voltage to the auxiliary contact two ends, can judge fast that mechanical stuck fault appears in the main contacts of D.C. contactor.
Also need to prove, in this article, relational terms such as the first and second grades only is used for an entity or operation are separated with another entity or operational zone, and not necessarily requires or hint and have the relation of any this reality or sequentially between these entities or the operation.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby not only comprise those key elements so that comprise process, method, article or the equipment of a series of key elements, but also comprise other key elements of clearly not listing, or also be included as the intrinsic key element of this process, method, article or equipment.In the situation that not more restrictions, the key element that is limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can directly use the software module of hardware, processor execution, and perhaps the combination of the two is implemented.Software module can place the storage medium of any other form known in random access memory (RAM), internal memory, ROM (read-only memory) (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or the technical field.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, in other embodiments realization.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. the detection method of a high-voltage DC contactor main contacts fault is characterized in that, the main contacts two ends of described D.C. contactor respectively with consumer be connected direct supply and be connected, described consumer is connected with described the first direct supply; The auxiliary contact two ends of described D.C. contactor respectively with dropping resistor be connected direct supply and be connected, described dropping resistor is connected with described the second direct supply, described auxiliary contact are along with described main contacts links, described method comprises:
When described the first direct supply of needs stopped as described consumer power supply, control disconnected the voltage that is 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 alerting signal, adhesion fault appears in order to the main contacts that characterizes described D.C. contactor, and described setting voltage is the merchant of described the second direct supply voltage and described dropping resistor.
2. method according to claim 1 is characterized in that, described method also comprises:
When described consumer needed work, the voltage that is applied to described D.C. contactor coil two ends was connected in control;
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 alerting signal, mechanical stuck fault appears in order to the main contacts that characterizes described D.C. contactor.
3. method according to claim 1 is characterized in that, described method also comprises:
When disconnection is applied to the voltage at 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, adhesion fault does not appear in order to the main contacts that characterizes described D.C. contactor.
4. method according to claim 2 is characterized in that, described method also comprises:
When connection is applied to the voltage at 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, mechanical stuck fault does not appear in order to the main contacts that characterizes described D.C. contactor.
5. according to claim 1 to 4 each described methods, it is characterized in that, be provided with mechanical linkage between the main contacts of described D.C. contactor and the auxiliary contact, so that described auxiliary contact engage simultaneously with described main contacts or disconnect.
6. the pick-up unit of a high-voltage DC contactor main contacts fault is characterized in that, the main contacts two ends of described D.C. contactor respectively with consumer be connected direct supply and be connected, described consumer is connected with described the first direct supply; The auxiliary contact two ends of described D.C. contactor respectively with dropping resistor be connected direct supply and be connected, described dropping resistor is connected with described the second direct supply, described auxiliary contact are along with described main contacts links, described device comprises:
The first control module is used for when described the first direct supply of needs stops as described consumer power supply, and control disconnects the voltage that is applied to described D.C. contactor coil two ends;
Detecting unit is for detection of the voltage at described auxiliary contact two ends;
Judging unit is used for judging whether the voltage at described auxiliary contact two ends is setting voltage, and described setting voltage is the merchant of described the second direct supply voltage and described dropping resistor;
The first transmitting element when being not setting voltage for the voltage at the described auxiliary contact two ends that described judgment unit judges obtains, sends the first alerting signal, adhesion fault occurs in order to the main contacts that characterizes described D.C. contactor.
7. device according to claim 6 is characterized in that, described device also comprises:
The second control module is used for when described consumer needs work, and the voltage that is applied to described D.C. contactor coil two ends is connected in control;
Described detecting unit is also for detection of the voltage at described auxiliary contact two ends;
Described judging unit also is used for judging whether the voltage at described auxiliary contact two ends is setting voltage;
The second transmitting element when being described setting voltage for the voltage at the described auxiliary contact two ends that described judgment unit judges obtains, sends the second alerting signal, mechanical stuck fault occurs in order to the main contacts that characterizes described D.C. contactor.
8. device according to claim 6 is characterized in that, described device also comprises:
The 3rd transmitting element, be used for being applied to when disconnection the voltage at described D.C. contactor coil two ends, and when the voltage at the described auxiliary contact two ends that described judgment unit judges obtains is described setting voltage, send the first safety signal, adhesion fault do not occur in order to the main contacts that characterizes described D.C. contactor.
9. device according to claim 7 is characterized in that, described device also comprises:
The 4th transmitting element, be used for being applied to when connection the voltage at described D.C. contactor coil two ends, and the voltage at the described auxiliary contact two ends that described judgment unit judges obtains is not described setting voltage, send the second safety signal, mechanical stuck fault do not occur in order to the main contacts that characterizes described D.C. contactor.
10. according to claim 6 to 9 each described devices, it is characterized in that, be provided with mechanical linkage between the main contacts of described D.C. contactor and the auxiliary contact, so that described auxiliary contact engage simultaneously with described main contacts or disconnect.
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