CN220289749U - Phase failure protection function detector - Google Patents
Phase failure protection function detector Download PDFInfo
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- CN220289749U CN220289749U CN202321851364.1U CN202321851364U CN220289749U CN 220289749 U CN220289749 U CN 220289749U CN 202321851364 U CN202321851364 U CN 202321851364U CN 220289749 U CN220289749 U CN 220289749U
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- 238000001514 detection method Methods 0.000 claims abstract description 136
- 238000000034 method Methods 0.000 abstract description 7
- 238000012360 testing method Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000819 phase cycle Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The utility model belongs to the technical field of detectors, and discloses a fault phase protection function detector which comprises a detector, wherein the detector is provided with a thermal relay and a main switch, the main switch is connected with a fuse, the main switch is connected with a fault phase detection knob switch and a fault phase detection knob switch in parallel, the fault phase detection knob switch is connected with a first state indicator lamp, a second state indicator lamp and a third state indicator lamp, and the fault phase detection knob switch is connected with a fourth state indicator lamp, a fifth state indicator lamp and a sixth state indicator lamp; the manual operation steps in the phase failure detection process can be greatly reduced, the safety risk caused by frequent line replacement operation is effectively reduced, the detection efficiency and quality are improved, and meanwhile, the device has a wide practical range and can be suitable for detecting the phase failure protection function of all three-phase power supply control lines.
Description
Technical Field
The utility model belongs to the technical field of detectors, and particularly relates to a fault phase protection function detector.
Background
The detection requirements for the phase failure protection are: "each elevator should have a phase failure and phase failure protection function; when the elevator runs independently of the phase sequence, a phase error protection device can be not arranged. The detection method comprises the following steps: (1) opening the main switch, respectively opening any one wire of the three-phase alternating current power supply at the output end of the main switch, closing the main switch, and checking whether the elevator can be started or not; (2) And (3) opening the main switch, exchanging the mutual positions of the two wires of the three-phase alternating current power supply at the output end of the main switch, closing the main switch, and checking whether the elevator can be started. "
From the above inspection requirement and method analysis, the inspection of the elevator open-phase protection function needs to disconnect any one wire of the three-phase alternating current for 3 times, and the inspection of the elevator open-phase protection function needs to exchange any two wires of the three-phase alternating current. In the function verification process, because the operation procedure is tedious, the risk of large safety operation such as electric shock of operators, disorder of wire identification and the like is easy to occur.
Therefore, the operation flow is simplified, the operation steps of detection personnel are reduced, the safety risk in the operation process is reduced, and the setting and research of the phase failure protection function detector are particularly important.
Disclosure of Invention
In view of the above-mentioned problems with the background art, the present utility model has as its object: aims to provide a phase failure protection function detector.
In order to achieve the technical purpose, the utility model adopts the following technical scheme:
the fault phase protection function detector comprises a detector, wherein the detector is provided with a thermal relay () and a main switch, the main switch is connected with a fuse, the main switch is connected with a fault phase detection knob switch and a fault phase detection knob switch in parallel, the fault phase detection knob switch is connected with a first state indicator lamp, a second state indicator lamp and a third state indicator lamp, and the fault phase detection knob switch is connected with a fourth state indicator lamp, a fifth state indicator lamp and a sixth state indicator lamp;
the detector is internally provided with a plurality of contactors and relays, wherein the contactors comprise contacts and coils, and are divided into a first contactor normally-closed contact, a first contactor normally-open contact, a first contactor coil, a second contactor normally-closed contact, a second contactor normally-open contact, a second contactor coil, a third contactor normally-closed contact, a third contactor normally-open contact, a third contactor coil, a fourth contactor normally-closed contact, a fourth contactor normally-open contact, a fourth contactor coil, a fifth contactor normally-closed contact, a fifth contactor normally-open contact, a fifth contactor coil, a first relay normally-open contact, a second relay normally-open contact, a third relay and a third relay normally-open contact;
the main switch is provided with three gears, namely a zero position gear, a phase-failure gear and a phase-failure gear, the phase-failure gear is connected with the second contactor coil, the phase-failure gear is connected with the first contactor coil, and the phase-failure gear are connected with a work indicator lamp ();
the open-phase detection knob switch is provided with four gears, namely an open-phase detection zero gear, an open-phase detection first gear, an open-phase detection second gear and an open-phase detection third gear, wherein the open-phase detection first gear is connected with the first relay, the second relay and the first status indicator () in parallel, the open-phase detection second gear is connected with the second relay, the third relay and the second status indicator in parallel, and the open-phase detection third gear is connected with the first relay, the third relay and the third status indicator in parallel;
the error phase detection knob switch is provided with four gears, namely an error phase detection zero gear, an error phase detection first gear, an error phase detection second gear and an error phase detection third gear, wherein the error phase detection first gear is connected with the third contactor coil and is connected with the fourth state indicator lamp in parallel, the error phase detection second gear is connected with the fourth contactor coil and is connected with the fifth state indicator lamp in parallel, the error phase detection third gear is connected with the fifth contactor coil and is connected with the sixth state indicator lamp in parallel, the fourth contactor normally-closed contact and the fifth contactor normally-closed contact are connected between the error phase detection first gear and the third contactor coil, the third contactor normally-closed contact and the fifth contactor normally-closed contact are connected between the error phase detection second gear and the fourth contactor coil, and the third contactor normally-closed contact and the fourth contactor normally-closed contact are connected between the error phase detection third gear and the fifth contactor coil;
the input end of the detector is connected with a first fire wire, a second fire wire, a third fire wire and a zero wire, and the output end of the detector is connected with a circuit to be detected.
Further limited, the main switch, the phase-failure detection knob switch and the phase-failure detection knob switch have a mechanical interlocking function, and the first contactor contact and the second contactor contact have an electrical interlocking function, so that the phase-failure detection knob switch cannot be used when the phase-failure detection knob switch is used, namely the phase-failure detection knob switches do not interfere with each other, and short circuit is prevented; the third contactor contact, the fourth contactor contact and the fifth contactor contact have an electric interlocking function during the phase-dislocation detection, so that when the phase-dislocation function is detected, the gear functions are independent of each other and do not interfere with each other, and the circuit short circuit is prevented.
The beneficial effects of the utility model are that:
the detection instrument has compact design, portability, simple operation, low failure rate, low maintenance difficulty and low cost; the device can greatly reduce manual operation steps in phase failure and phase error detection, effectively reduce safety risks caused by frequent line replacement operation, improve detection efficiency and quality, and is wide in practical range and applicable to verification of phase failure and phase error protection functions of all three-phase power supply control lines.
Drawings
The utility model can be further illustrated by means of non-limiting examples given in the accompanying drawings;
FIG. 1 is a schematic diagram of circuit connection of an embodiment of a phase failure protection function detector according to the present utility model;
the main reference numerals are as follows:
a detector 1; thermal relay FR; a main switch SB; a fuse FU; a phase failure detection knob switch SA1; a phase error detection knob switch SA2; a work indicator lamp HL1; a first status indicator lamp HL2; a second status indicator lamp HL3; a third status indicator lamp HL4; a fourth status indicator lamp HL5; a fifth status indicator lamp HL6; a sixth status indicator lamp HL7;
a first contactor normally-closed contact KM1'; a first contactor normally open contact KM1"; a first contactor coil KM1; a second contactor normally closed contact KM2'; a second contactor normally open contact KM2"; a second contactor coil KM2; a third contactor normally closed contact KM3'; a third contactor normally open contact KM3"; a third contactor coil KM3; a fourth contactor normally closed contact KM4'; a fourth contactor normally open contact KM4"; a fourth contactor coil KM4; a fifth contactor normally closed contact KM5'; a fifth contactor normally open contact KM5"; a fifth contactor coil KM5; a first relay KT1; a first relay normally open contact KT1'; a second relay KT2; a second relay normally open contact KT2'; a third relay KT3; a third relay normally open contact KT3';
a phase shift SB1; zero gear SB2; open phase gear SB3;
phase failure detection zero shift SA11; phase failure detection one gear SA12; phase failure detection second gear SA13; open-phase detection three gear SA14;
phase-error detection zero shift SA21; detecting a gear SA22 by phase error; error phase detection second gear SA23; phase error detection three-gear SA24;
a first live line L1; a second live line L2; a third live line L3; zero line N.
Detailed Description
In order that those skilled in the art will better understand the present utility model, the following technical scheme of the present utility model will be further described with reference to the accompanying drawings and examples.
As shown in fig. 1, the phase failure protection function detector of the utility model comprises a detector 1, wherein the detector 1 is provided with a thermal relay (FR) and a master switch SB, the master switch SB is connected with a fuse FU, the master switch SB is connected with a phase failure detection knob switch SA1 and a phase failure detection knob switch SA2 in parallel, the phase failure detection knob switch SA1 is connected with a first status indicator lamp HL2, a second status indicator lamp HL3 and a third status indicator lamp HL4, and the phase failure detection knob switch SA2 is connected with a fourth status indicator lamp HL5, a fifth status indicator lamp HL6 and a sixth status indicator lamp HL7;
the detector 1 is internally provided with a plurality of contactors and relays, the contactors comprise contacts and coils, the device comprises a first contactor normally-closed contact KM1', a first contactor normally-open contact KM1', a first contactor coil KM1, a second contactor normally-closed contact KM2', a second contactor normally-open contact KM2', a first contactor coil and a second contactor coil, wherein the first contactor coil is a closed contact of the first contactor coil and the second contactor coil is a closed contact of the second contactor coil, the second contactor coil is a closed contact of the second contactor coil, and the first contactor coil of the second contactor coil a second contactor coil KM2, a third contactor normally-closed contact KM3', a third contactor normally-open contact KM3", a third contactor coil KM3, a fourth contactor normally-closed contact KM4', a third contactor normally-closed contact KM3, a fourth contactor normally-closed contact KM4', a third contactor normally-closed contact KM a fourth contactor normally open contact KM4", a fourth contactor coil KM4, a fifth contactor normally closed contact KM5', a fifth contactor normally open contact KM5", a fifth contactor coil KM5, a first relay KT1, a first relay normally open contact KT1', a second relay KT2, a second relay normally open contact KT2', a third relay KT3, and a third relay normally open contact KT3';
the main switch SB has three gears, which is divided into a zero position gear SB2, a phase-failure gear SB1 and a phase-failure gear SB3, wherein the phase-failure gear SB1 is connected with the second contactor coil KM2, the phase-failure gear SB3 is connected with the first contactor coil KM1, and the phase-failure gear SB1 and the phase-failure gear SB3 are connected with a working indicator lamp (HL 1) in parallel;
the open-phase detection knob switch SA1 has four gears, namely an open-phase detection zero gear SA11, an open-phase detection first gear SA12, an open-phase detection second gear SA13 and an open-phase detection third gear SA14, wherein the open-phase detection first gear SA12 is connected with the first relay KT1, the second relay KT2 and the first status indicator lamp (HL 2) in parallel, the open-phase detection second gear SA13 is connected with the second relay KT2, the third relay KT3 and the second status indicator lamp HL3 in parallel, and the open-phase detection third gear SA14 is connected with the first relay KT1, the third relay KT3 and the third status indicator lamp HL4 in parallel;
the error phase detection knob switch SA2 has four gears, namely an error phase detection zero gear SA21, an error phase detection first gear SA22, an error phase detection second gear SA23 and an error phase detection third gear SA24, wherein the error phase detection first gear SA22 is connected with a third contactor coil KM3 and is connected with a fourth state indicator lamp HL5 in parallel, the error phase detection second gear SA23 is connected with a fourth contactor coil KM4 and is connected with a fifth state indicator lamp HL6 in parallel, the error phase detection third gear SA24 is connected with a fifth contactor coil KM5 and is connected with a sixth state indicator lamp HL7 in parallel, a fourth contactor normally-closed contact KM4' and a fifth contactor normally-closed contact KM5' are connected between the error phase detection first gear SA22 and the third contactor coil KM3, a third contactor normally-closed contact KM3' and a fifth contactor normally-closed contact KM5' are connected between the error phase detection second gear SA23 and the fourth contactor coil KM4, and a third contactor normally-closed contact KM3' and a fourth contactor normally-closed contact KM4' are connected between the error phase detection third gear SA24 and the fifth contactor coil 5';
the input end of the detector 1 is connected with a first live wire L1, a second live wire L2, a third live wire L3 and a zero line N, and the output end of the detector is connected with a circuit to be detected.
In this embodiment, when the phase failure protection function detector is used, the power distribution box is turned on, the three-phase power main switch is turned off, four wires at the input end of the detector 1 are sequentially connected to the output end and the zero line end of the main switch, and three phases of the circuit to be detected are guided to be correspondingly connected to the output end of the detector 1, namely, the series connection of the circuit to be detected and the detector 1 with the first live wire L1, the second live wire L2 and the third live wire L3 is realized, the three-phase power main switch is turned on, the main switch SB on the detector 1 is turned on, and the phase failure detection knob switch SA2 and the phase failure detection knob switch SA1 are placed in zero positions.
Embodiment one:
when the fault phase protection function is detected, the main switch SB is arranged in a fault phase gear SB1, a coil of the second contactor KM2 is electrified, a normally open contact KM2 'of the second contactor is attracted, a normally closed contact KM2' of the second contactor is disconnected, the fault phase detection knob switch SA1 is in a fault phase detection zero gear SA11 state, the working indicator lamp HL1 is lightened to indicate that the working is started, the state is normal, and the fault phase detection knob switch SA2 is rotated to start detection;
when the misphase detection knob switch SA2 is placed in a misphase detection first gear SA22, a fourth contactor normally-closed contact KM4 'and a fifth contactor normally-closed contact KM5' are kept in a closed state, a third contactor coil KM3 is electrified, a third contactor normally-open contact KM3 'is attracted, a third contactor normally-closed contact KM3' is disconnected, a fourth state indicator lamp HL5 is lightened, and at the moment, a second live wire L2 and a third live wire L3 in a three-phase alternating-current electric wire are exchanged; similarly, when the misphase detection knob switch SA2 is placed in the misphase detection second gear SA23, the third contactor normally-closed contact KM3 'and the fifth contactor normally-closed contact KM5' are kept in a closed state, the fourth contactor coil KM4 is electrified, the fourth contactor normally-open contact KM4 'is attracted, the fourth contactor normally-closed contact KM4' is disconnected, and the fifth state indicator lamp HL6 is lightened, and at the moment, the first live wire L1 and the third live wire L3 in the three-phase alternating-current electric wire are exchanged; similarly, when the misphase detection knob switch SA2 is arranged in the misphase detection three-gear SA24, the third contactor normally-closed contact KM3 'and the fourth contactor normally-closed contact KM4' are kept in a closed state, the fifth contactor coil KM5 is electrified, the fifth contactor normally-open contact KM5 'is attracted, the fifth contactor normally-closed contact KM5' is disconnected, the sixth state indicator lamp HL7 is lightened, and at the moment, the first live wire L1 and the second live wire L2 in the three-phase alternating-current electric wire are exchanged;
therefore, the detection of the misphase protection function can be completed by operating the misphase detection knob switch SA2, and if the equipment connected with the detection circuit cannot be started in the misphase state, the misphase protection function of the equipment is effective; if the running direction of the equipment in the wrong phase state is opposite to the normal running direction, the wrong phase protection function of the equipment is invalid or the wrong phase protection function does not exist; if the running direction of the equipment in the wrong phase state is the same as the normal running direction, the running direction of the equipment is irrelevant to the phase sequence, and a detector can judge according to the corresponding standard and specification.
Embodiment two:
when the open-phase protection function is detected, the main switch SB is arranged in an open-phase gear SB3, the first contactor coil KM1 is electrified, the first contactor normally-open contact KM1 'is in suction, the first contactor normally-closed contact KM1' is disconnected, the wrong-phase detection knob switch SA2 is in a wrong-phase detection zero-gear SA21 state, the working indicator lamp HL1 is lightened, the starting working state is normal, and the rotation open-phase detection knob switch SA1 starts to detect;
when the open-phase detection knob switch SA1 is placed in an open-phase detection first gear SA12 gear, coils of the first relay KT1 and the second relay KT2 are electrified, contacts of the first relay KT1 and the second relay KT2 are attracted, a first state indicator lamp HL2 is lightened, a normally open contact KT3' of the third relay is not connected, and a first live wire L1 is in a non-connection state; similarly, when the open-phase detection knob switch SA1 is placed in the open-phase detection second gear SA13 gear, coils of the second relay KT2 and the third relay KT3 are electrified, contacts of the second relay KT2 and the third relay KT3 are attracted, the second state indicator lamp HL3 is lightened, the normally open contact KT1' of the first relay is not connected, and the third live wire L3 is in a non-connected state; similarly, when the open-phase detection knob switch SA1 is placed in the open-phase detection three-gear SA14, coils of the first relay KT1 and the third relay KT3 are electrified, contacts of the first relay KT1 and the third relay KT3 are attracted, the third state indicator lamp HL4 is lightened, a normally open contact KT2' of the second contactor is not connected, and the second live wire L2 is in a non-connected state;
therefore, the detection of the open-phase protection function can be completed by operating the open-phase detection knob switch SA1, and if the equipment cannot be started in the open-phase state, the open-phase protection function of the equipment is effective; if the equipment can be started in the open-phase state, the equipment is not driven by a three-phase power supply, and a detection personnel can judge according to corresponding standards and specifications.
Embodiment III:
the main switch SB is arranged in the open phase SB3 grade, the first contactor coil KM1 is electrified, the first contactor normally open contact KM1 'is in suction, the first contactor normally closed contact KM1' is disconnected, the wrong phase detection knob switch SA2 is arranged in the state of wrong phase detection first gear SA22, wrong phase detection second gear SA23 or wrong phase detection third gear SA24, the working indicator lamp HL1 is not lightened, the working state is abnormal, the test of open phase protection function cannot be carried out, a detector is required to test the wrong phase detection switch in the wrong phase detection zero gear SA21, and the design can effectively prevent short circuit caused by misoperation or illegal operation in the operation process of the detector, thereby damaging a test circuit.
Embodiment four:
the main switch SB is arranged in wrong phase SB1 shelves, the second contactor KM2 coil is electrified, the second contactor normally open contact KM2 'is sucked, the second contactor normally closed contact KM2' is disconnected, the open-phase detection knob switch SA1 is arranged in the open-phase detection first gear SA12, the open-phase detection second gear SA13 or the open-phase detection third gear SA14 state, the working indicator lamp HL1 is not lightened, the working state is abnormal, the test of wrong phase protection function cannot be carried out, the open-phase detection switch is arranged in the open-phase detection zero gear SA11 side by a detector to carry out the test, and the design can effectively prevent short circuit caused by misoperation or illegal operation in the operation process of the detector, thereby damaging a test circuit.
The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims of this utility model, which are within the skill of those skilled in the art, can be made without departing from the spirit and scope of the utility model disclosed herein.
Claims (2)
1. The fault phase protection function detector comprises a detector (1), and is characterized in that: the detector (1) is provided with a thermal relay (FR) and a main Switch (SB), the main Switch (SB) is connected with a Fuse (FU), the main Switch (SB) is connected with a phase failure detection knob switch (SA 1) and a phase failure detection knob switch (SA 2) in parallel, the phase failure detection knob switch (SA 1) is connected with a first state indicator lamp (HL 2), a second state indicator lamp (HL 3) and a third state indicator lamp (HL 4), and the phase failure detection knob switch (SA 2) is connected with a fourth state indicator lamp (HL 5), a fifth state indicator lamp (HL 6) and a sixth state indicator lamp (HL 7);
the detector (1) is internally provided with a plurality of contactors and relays, wherein the contactors comprise a contact and a coil, and are divided into a first contactor normally-closed contact (KM 1 '), a first contactor normally-open contact (KM 1'), a first contactor coil (KM 1), a second contactor normally-closed contact (KM 2 '), a second contactor normally-open contact (KM 2'), a second contactor coil (KM 2), a third contactor normally-closed contact (KM 3 '), a third contactor normally-open contact (KM 3'), a third contactor coil (KM 3), a fourth contactor normally-closed contact (KM 4 '), a fourth contactor normally-open contact (KM 4), a fourth contactor coil (KM 4'), a fifth contactor normally-closed contact (KM 5 '), a fifth contactor coil (KM 5), a first relay (KT 1), a first relay normally-open contact (KT 1'), a second relay (KT 2), a second relay normally-open contact (KT 3 ') and a third relay (KT 3');
the main Switch (SB) is provided with three gears, which are a zero position gear (SB 2), a phase-failure gear (SB 1) and a phase-failure gear (SB 3), wherein the phase-failure gear (SB 1) is connected with the second contactor coil (KM 2), the phase-failure gear (SB 3) is connected with the first contactor coil (KM 1), and the phase-failure gear (SB 1) and the phase-failure gear (SB 3) are connected with a working indicator lamp (HL 1) in parallel;
the open-phase detection knob switch (SA 1) is provided with four gears, namely an open-phase detection zero gear (SA 11), an open-phase detection first gear (SA 12), an open-phase detection second gear (SA 13) and an open-phase detection third gear (SA 14), wherein the open-phase detection first gear (SA 12) is connected with the first relay (KT 1), the second relay (KT 2) and the first status indicator lamp (HL 2) in parallel, the open-phase detection second gear (SA 13) is connected with the second relay (KT 2), the third relay (KT 3) and the second status indicator lamp (HL 3) in parallel, and the open-phase detection third gear (SA 14) is connected with the first relay (KT 1), the third relay (KT 3) and the third status indicator lamp (HL 4) in parallel;
the error phase detection knob switch (SA 2) is provided with four gears, namely an error phase detection zero gear (SA 21), an error phase detection first gear (SA 22), an error phase detection second gear (SA 23) and an error phase detection third gear (SA 24), the error phase detection first gear (SA 22) is connected with the third contactor coil (KM 3) in parallel connection with the fourth state indicator lamp (HL 5), the error phase detection second gear (SA 23) is connected with the fourth contactor coil (KM 4) in parallel connection with the fifth state indicator lamp (HL 6), the error phase detection third gear (SA 24) is connected with the fifth contactor coil (KM 5) in parallel connection with the sixth state indicator lamp (HL 7), the error phase detection first gear (SA 22) is connected with the fourth contactor contact (KM 4 ') and the fifth contactor coil (KM 3 '), and the error phase detection first contactor (SA 24 ') is connected with the fifth contactor coil (KM 3 ') and the fifth contactor coil (KM 3 ');
the input end of the detector (1) is connected with a first live wire (L1), a second live wire (L2), a third live wire (L3) and a zero wire (N), and the output end of the detector is connected with a circuit to be detected.
2. The phase failure protection function detector according to claim 1, wherein: the main Switch (SB), the phase failure detection knob switch (SA 2) and the phase failure detection knob switch (SA 1) have mechanical interlocking functions, the first contactor normally-closed contact (KM 1 ') and the second contactor normally-closed contact (KM 2 ') have electrical interlocking functions, and the third contactor normally-closed contact (KM 3 ') and the fourth contactor normally-closed contact (KM 4 ') and the fifth contactor normally-closed contact (KM 5 ') have electrical interlocking functions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321851364.1U CN220289749U (en) | 2023-07-14 | 2023-07-14 | Phase failure protection function detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321851364.1U CN220289749U (en) | 2023-07-14 | 2023-07-14 | Phase failure protection function detector |
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| Publication Number | Publication Date |
|---|---|
| CN220289749U true CN220289749U (en) | 2024-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202321851364.1U Active CN220289749U (en) | 2023-07-14 | 2023-07-14 | Phase failure protection function detector |
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| CN (1) | CN220289749U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110571764A (en) * | 2019-09-30 | 2019-12-13 | 江苏省特种设备安全监督检验研究院 | Automatic power supply switching device for checking fault phase protection function of crane |
-
2023
- 2023-07-14 CN CN202321851364.1U patent/CN220289749U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110571764A (en) * | 2019-09-30 | 2019-12-13 | 江苏省特种设备安全监督检验研究院 | Automatic power supply switching device for checking fault phase protection function of crane |
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