CN101702604A - Multi-functional electric motor protecting and starting device - Google Patents
Multi-functional electric motor protecting and starting device Download PDFInfo
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- CN101702604A CN101702604A CN200910252970A CN200910252970A CN101702604A CN 101702604 A CN101702604 A CN 101702604A CN 200910252970 A CN200910252970 A CN 200910252970A CN 200910252970 A CN200910252970 A CN 200910252970A CN 101702604 A CN101702604 A CN 101702604A
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Abstract
A multi-functional electric motor protecting and starting device comprises three-phase fuses connected between a three-phase power and an electric motor orderly in series; a first, a second and a third normally open contact points of alternative current contactor for connecting the three-phase power supply lines correspondingly and a three-phase heat relay, wherein the device further comprises a three-phase leakage relay, a first, a second and a third switches; the first switch is normal close switch, the second switch is normal open switch and the third switch is double-pole interlock switch capable of normal opening and closing; the connecting ends of the three-phase power of the leakage relay are correspondingly connected to the two phase live wires and zero line in the three-phase power respectively; the leakage protecting controlling end of the leakage relay is connected with the other phase live wire through the normal close contact joint of heat relay, the coil of the alternative current contactor and the series circuits of the first switch and the second switch; the normal open contact joint of the third switch is connected with the second switch in parallel; and the normal close contact joint of the third switch is connected with the series circuit of the fourth normal open contact joint of the alternative contactor and the second switch in parallel.
Description
Technical field
The present invention relates to the electric motor protecting technical field, relate in particular to a kind of multi-functional electric motor protecting, starting drive.
Background technology
Traditional electric motor protecting scheme as shown in Figure 1; the three-phase normal opened contact KM-1, KM-2, KM-3 and the thermal relay FR that are serially connected with fuse Fu, A.C. contactor KM successively between three phase mains (L1, L2, L3 phase) and the motor M; thisly can carry out short circuit, overload protection and because the overtemperature protection that overcurrent causes, but present this protection scheme can not carry out phase shortage, earth leakage protective reliably in the wet environment by fuse Fu, A.C. contactor KM and thermal relay FR.
Summary of the invention
The purpose of this invention is to provide a kind of multi-functional electric motor protecting, starting drive, not only can carry out short circuit, overload, overtemperature protection, can also carry out crawl, the long-term work start-up operation of phase shortage, earth leakage protective and motor.
A kind of multi-functional electric motor protecting; starting drive; comprise the three-phase fuse that is serially connected with successively between three phase mains and the motor; the correspondence that is used for of A.C. contactor connects first of three-phase power line; second; the 3rd normal opened contact and three-phase thermal relay; wherein: this multi-functional electric motor protecting; starting drive also comprises the three-phase leakage relay; first; second; the 3rd switch; wherein; first switch is a normally closed switch; second switch is a normal open switch; the 3rd switch is for often opening; normally closed double-pole linked switch; wherein; on corresponding respectively two phase firewires and zero line that are connected in the three phase mains of the three phase mains link of this leakage relay; the earth leakage protective control end of leakage relay is by the normally closed contact of thermal relay; the coil of A.C. contactor; first switch; the series circuit of second switch is connected on another phase firewire in the three phase mains; the normal opened contact of the 3rd switch second switch in parallel, the normally closed contact of the 3rd switch is in parallel with second switch with the series circuit of A.C. contactor the 4th normal opened contact.
Described multi-functional electric motor protecting, starting drive; wherein: on corresponding respectively L1 phase, L2 phase firewire and the zero line that is connected in the three phase mains of the three phase mains link of this leakage relay, the series circuit of the coil of the normally closed contact of the earth leakage protective control end of leakage relay by thermal relay, A.C. contactor, first switch, second switch is connected on the L3 phase firewire in the three phase mains.
Described multi-functional electric motor protecting, starting drive; wherein: on corresponding respectively L2 phase, L3 phase firewire and the zero line that is connected in the three phase mains of the three phase mains link of this leakage relay, the series circuit of the coil of the normally closed contact of the earth leakage protective control end of leakage relay by thermal relay, A.C. contactor, first switch, second switch is connected on the L1 phase firewire in the three phase mains.
Described multi-functional electric motor protecting, starting drive; wherein: on corresponding respectively L1 phase, L3 phase firewire and the zero line that is connected in the three phase mains of the three phase mains link of this leakage relay, the series circuit of the coil of the normally closed contact of the earth leakage protective control end of leakage relay by thermal relay, A.C. contactor, first switch, second switch is connected on the L2 phase firewire in the three phase mains.
The present invention adopts technique scheme will reach following technique effect:
Multi-functional electric motor protecting of the present invention, starting drive, on corresponding respectively two phase firewires and zero line that are connected in the three phase mains of the three phase mains link of this leakage relay, the earth leakage protective control end of leakage relay is by the normally closed contact of thermal relay, the coil of A.C. contactor, first switch, the series circuit of second switch is connected on another phase firewire in the three phase mains, if three phase mains generation phase shortage or motor electric leakage accident, leakage relay is with immediate response, disconnect the normally closed contact of thermal relay, the coil of A.C. contactor, first switch, the series circuit of second switch, the ac contactor coil dead electricity, the A.C. contactor three-phase normal opened contact that is serially connected with between three phase mains and the motor all disconnects, motor has a power failure, and the protection motor is not damaged; And under three phase mains normal power supply and the normal situation of motor, when needing the crawl motor, press the 3rd switch (after unclamping the 3rd switch, the 3rd switch promptly resets to reset condition), the normal opened contact adhesive of the 3rd switch once, ac contactor coil gets electricity, the adhesive simultaneously of first, second, third normal opened contact of A.C. contactor once, motor gets electricity, realizes crawl; When needing motor to continue long-term work, press second switch, the series circuit of the normally closed contact of thermal relay, the coil of A.C. contactor, first switch, second switch powers on, first, second, third, fourth normal opened contact adhesive of A.C. contactor, the 4th normal opened contact of A.C. contactor and the normally closed contact of the 3rd switch and second switch constitute latching circuit, after unclamping second switch and resetting, can guarantee that also motor continues to obtain power supply, when needing to disconnect the motor power supply, pressing one time first switch gets final product, the supply line of motor disconnects, and first switch resets.As fully visible, multi-functional electric motor protecting of the present invention, starting drive not only have short circuit, overload, the overheat protective function of conventional motors protective device, can also carry out crawl, the long-term work start-up operation of phase shortage, earth leakage protective and motor.
Description of drawings
Fig. 1 is the structural principle schematic diagram of electric motor protective device in the prior art;
Fig. 2 is the structure principle chart of multi-functional electric motor protecting of the present invention, starting drive.
Embodiment
A kind of multi-functional electric motor protecting; starting drive; as shown in Figure 2; comprise the three-phase fuse FU that is serially connected with successively between three phase mains and the motor; the correspondence that is used for of A.C. contactor KM connects first of three-phase power line; second; the 3rd normal opened contact KM-1; KM-2; KM-3 and three-phase thermal relay FR; also comprise three-phase leakage relay JD (present embodiment adopts JD6-E); the first switch S B1; second switch SB2; the 3rd switch S B3; wherein; the first switch S B1 is a normally closed switch; second switch SB2 is a normal open switch; the 3rd switch is that SB3 often opens; normally closed double-pole linked switch (normal opened contact SB3-1; normally closed contact SB3-2); wherein; the three phase mains link 1 of this leakage relay JD; 2; 3 pin correspondence respectively are connected in zero line; L1 phase in the three phase mains; on the L2 phase firewire; earth leakage protective control end 4 pin of leakage relay JD are by the normally closed contact FR-1 of thermal relay FR; the coil of A.C. contactor KM; the first switch S B1; the series circuit of second switch SB2 is connected on the L3 phase firewire in the three phase mains; the normal opened contact SB3-1 of the 3rd switch S B3 second switch SB2 in parallel, the normally closed contact SB3-2 of the 3rd switch S B3 is in parallel with second switch SB2 with the series circuit of A.C. contactor KM the 4th normal opened contact KM-4.
If L1, L2, L3 three phase mains generation phase shortage or motor M electric leakage accident, leakage relay JD is with immediate response, disconnect the coil of normally closed contact FR-1, the A.C. contactor KM of thermal relay FR, the series circuit of the first switch S B1, second switch SB2, A.C. contactor KM coil losing electricity, the A.C. contactor KM three-phase normal opened contact that is serially connected with between three phase mains and the motor all disconnects, motor has a power failure, and the protection motor is not damaged; And under three phase mains normal power supply and the normal situation of motor, when needing the crawl motor, press the 3rd switch S B3 (after unclamping the 3rd switch S B3, the 3rd switch S B3 promptly resets to reset condition), the normal opened contact SB3-1 adhesive of the 3rd switch S B3 once, A.C. contactor KM coil gets electricity, the adhesive simultaneously of first, second, third normal opened contact of A.C. contactor KM once, motor gets electricity, realizes crawl; When needing motor to continue long-term work, press second switch SB2, the normally closed contact FR-1 of thermal relay FR, the coil of A.C. contactor KM, the first switch S B1, the series circuit of second switch SB2 powers on, first of A.C. contactor KM, second, the 3rd, the 4th normal opened contact adhesive, the normally closed contact SB3-2 of the 4th normal opened contact of A.C. contactor KM and the 3rd switch S B3 and second switch SB2 constitute latching circuit, after unclamping second switch SB2 and resetting, can guarantee that also motor continues to obtain power supply, when needing to disconnect the motor power supply, pressing one time first switch S B1 gets final product, the supply line of motor disconnects, and the first switch S B1 resets.
In addition, three phase mains link 1,2,3 pin of leakage relay JD are can also be respectively corresponding to be connected on L2 phase in zero line, the three phase mains, the L3 phase firewire, perhaps, three phase mains link 1,2,3 pin of leakage relay JD are corresponding respectively to be connected on L1 phase in zero line, the three phase mains, the L3 phase firewire, also can produce same effect, the concrete course of work repeats no more here with reference to aforementioned first kind of situation.
As fully visible, multi-functional electric motor protecting of the present invention, starting drive not only have short circuit, overload, the overheat protective function of conventional motors protective device, can also carry out crawl, the long-term work start-up operation of phase shortage, earth leakage protective and motor M.
Claims (4)
1. multi-functional electric motor protecting; starting drive; comprise the three-phase fuse that is serially connected with successively between three phase mains and the motor; the correspondence that is used for of A.C. contactor connects first of three-phase power line; second; the 3rd normal opened contact and three-phase thermal relay; it is characterized in that: this multi-functional electric motor protecting; starting drive also comprises the three-phase leakage relay; first; second; the 3rd switch; wherein; first switch is a normally closed switch; second switch is a normal open switch; the 3rd switch is for often opening; normally closed double-pole linked switch; wherein; on corresponding respectively two phase firewires and zero line that are connected in the three phase mains of the three phase mains link of this leakage relay; the earth leakage protective control end of leakage relay is by the normally closed contact of thermal relay; the coil of A.C. contactor; first switch; the series circuit of second switch is connected on another phase firewire in the three phase mains; the normal opened contact of the 3rd switch second switch in parallel, the normally closed contact of the 3rd switch is in parallel with second switch with the series circuit of A.C. contactor the 4th normal opened contact.
2. multi-functional electric motor protecting as claimed in claim 1, starting drive; it is characterized in that: on corresponding respectively L1 phase, L2 phase firewire and the zero line that is connected in the three phase mains of the three phase mains link of this leakage relay, the series circuit of the coil of the normally closed contact of the earth leakage protective control end of leakage relay by thermal relay, A.C. contactor, first switch, second switch is connected on the L3 phase firewire in the three phase mains.
3. multi-functional electric motor protecting as claimed in claim 1, starting drive; it is characterized in that: on corresponding respectively L2 phase, L3 phase firewire and the zero line that is connected in the three phase mains of the three phase mains link of this leakage relay, the series circuit of the coil of the normally closed contact of the earth leakage protective control end of leakage relay by thermal relay, A.C. contactor, first switch, second switch is connected on the L1 phase firewire in the three phase mains.
4. multi-functional electric motor protecting as claimed in claim 1, starting drive; it is characterized in that: on corresponding respectively L1 phase, L3 phase firewire and the zero line that is connected in the three phase mains of the three phase mains link of this leakage relay, the series circuit of the coil of the normally closed contact of the earth leakage protective control end of leakage relay by thermal relay, A.C. contactor, first switch, second switch is connected on the L2 phase firewire in the three phase mains.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910252970A CN101702604A (en) | 2009-12-07 | 2009-12-07 | Multi-functional electric motor protecting and starting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910252970A CN101702604A (en) | 2009-12-07 | 2009-12-07 | Multi-functional electric motor protecting and starting device |
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| CN101702604A true CN101702604A (en) | 2010-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910252970A Pending CN101702604A (en) | 2009-12-07 | 2009-12-07 | Multi-functional electric motor protecting and starting device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101908852A (en) * | 2010-06-29 | 2010-12-08 | 河南省电力公司许昌供电公司 | Power-saving Y-delta starter of motor |
| CN102723690A (en) * | 2012-07-05 | 2012-10-10 | 三一重型装备有限公司 | Protection device and engineering machinery |
| CN102931626A (en) * | 2011-08-12 | 2013-02-13 | 国家电网公司 | Circuit capable of protecting fuse-type disconnecting switch in rural distribution network |
| CN106384939A (en) * | 2016-09-05 | 2017-02-08 | 衢州市依科达节能技术有限公司 | Distribution box with open-phase protection |
| CN107528501A (en) * | 2017-07-21 | 2017-12-29 | 东莞建晖纸业有限公司 | Paper machine coating cycle hot blast centrifugal blower control device |
| CN114124986A (en) * | 2021-09-02 | 2022-03-01 | 杭州腾泰智能设备有限公司 | Intelligent power distribution system with remote and near range interconnection and intercommunication and multi-million mutual control |
-
2009
- 2009-12-07 CN CN200910252970A patent/CN101702604A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101908852A (en) * | 2010-06-29 | 2010-12-08 | 河南省电力公司许昌供电公司 | Power-saving Y-delta starter of motor |
| CN102931626A (en) * | 2011-08-12 | 2013-02-13 | 国家电网公司 | Circuit capable of protecting fuse-type disconnecting switch in rural distribution network |
| CN102723690A (en) * | 2012-07-05 | 2012-10-10 | 三一重型装备有限公司 | Protection device and engineering machinery |
| CN106384939A (en) * | 2016-09-05 | 2017-02-08 | 衢州市依科达节能技术有限公司 | Distribution box with open-phase protection |
| CN107528501A (en) * | 2017-07-21 | 2017-12-29 | 东莞建晖纸业有限公司 | Paper machine coating cycle hot blast centrifugal blower control device |
| CN114124986A (en) * | 2021-09-02 | 2022-03-01 | 杭州腾泰智能设备有限公司 | Intelligent power distribution system with remote and near range interconnection and intercommunication and multi-million mutual control |
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Open date: 20100505 |