CN211498753U - Emergency gate monitoring system for alternating current/direct current motor - Google Patents
Emergency gate monitoring system for alternating current/direct current motor Download PDFInfo
- Publication number
- CN211498753U CN211498753U CN201922185702.2U CN201922185702U CN211498753U CN 211498753 U CN211498753 U CN 211498753U CN 201922185702 U CN201922185702 U CN 201922185702U CN 211498753 U CN211498753 U CN 211498753U
- Authority
- CN
- China
- Prior art keywords
- motor
- alternating current
- direct current
- double
- monitoring system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model relates to an emergent gate monitored control system of AC/DC motor, in particular to gate control technical field. The method comprises the following steps: the controller, the alternating current electric control unit and the direct current control unit; the alternating current electric control unit comprises a working power supply, a double-shaft extension motor and a positive and negative rotation alternating current contactor, a main brake switch is arranged at the output end of the working power supply, and the double-shaft extension motor is electrically connected with the working power supply through the positive and negative rotation alternating current contactor and the main brake switch; the direct current control unit comprises a charger, a storage battery, a coupling, a forward and reverse direct current contactor and a direct current motor; the positive and negative rotation direct current contactor is electrically connected with the direct current motor, the direct current motor and the double-shaft extension motor are both provided with main shafts, and the main shafts are connected with the main shafts of the double-shaft extension motor through the coupling. The technical problem of how to supply power emergently when the alternating current power supply is cut off is solved, and the emergency power supply device is suitable for emergency power supply when the alternating current power supply is cut off.
Description
Technical Field
The utility model relates to a gate control technical field, in particular to emergent gate monitored control system of AC/DC motor.
Background
The hydropower station is influenced by heavy rain to cause river water to swell violently, form local debris flow and mountain landslide, and often at the critical moment, power grid disconnection, unit accident shutdown and station service interruption occur simultaneously. When the power generation is interrupted after the accident shutdown, the river water can not flow downstream through the water intake gate, the channel, the forebay, the unit and the tail water, the water level along the water intake gate dam forebay area and the water diversion channel rises sharply, and if the water intake flood discharge gate can not be lifted in time, the gate top and the gate dam top are turned over; then the top of the flood control dike at the two banks at the upstream of the gate dam and the top of the dike at the two sides of the water inlet channel start to turn over; river water which turns over an earth dam or an earth canal can take away slope filler behind the dam (dyke) in a short time, then the foundation of the dam (dyke) is washed away, the dam or the dyke breaks in a short time, and if a certain reservoir capacity exists in front of a gate dam of a power station, serious water damage accidents can cause large-area personal casualties and property loss accidents. In the flood season of a power station, major water damage accidents are caused by the interruption of power station power supply due to accidents every year.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is how to promptly supply power when alternating current power supply cuts off.
The utility model provides an above-mentioned technical problem's technical scheme as follows: an emergency gate monitoring system for an alternating current/direct current motor, comprising: the controller, the alternating current electric control unit and the direct current control unit;
the alternating current electric control unit comprises a working power supply, a double-shaft extension motor and a positive and negative rotation alternating current contactor, a main brake switch is arranged at the output end of the working power supply, and the double-shaft extension motor is electrically connected with the working power supply through the positive and negative rotation alternating current contactor and the main brake switch;
the direct current control unit comprises a charger, a storage battery, a coupling, a forward and reverse direct current contactor and a direct current motor; the positive and negative rotation direct current contactor is electrically connected with the direct current motor, the direct current motor and the double-shaft extension motor are both provided with a main shaft, and the main shaft is connected with the main shaft of the double-shaft extension motor through the coupling;
the controller is connected with the alternating current electric control unit and the direct current control unit.
The utility model has the advantages that: when the power grid is normal, the system alternating current voltage supplies power, and the gate is controlled through the forward and reverse rotating alternating current contactor and the main gate switch; once the power consumption equipment connected with the system is interrupted by AC power supply due to reasons, the controller detects the interruption of the power supply of the AC electric control unit, the DC control unit is started immediately, and the storage battery drives the DC motor to drive the hoist to rotate positively and negatively through the positive and negative rotating contactor so as to control the gate. Therefore, the reliability of the hydropower station flood discharge gate is greatly improved.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Further, the alternating current control unit specifically comprises a working electric brake switch, a loop protection switch, an alternating current contactor and a hoist, the working power supply is introduced through the working electric brake switch and the loop protection switch, and the alternating current contactor is electrically connected with the double-shaft extension motor through the alternating current positive and negative rotation contactor; one output end of the double-shaft extension motor is connected with the hoist to output mechanical torque to drive the hoist to rotate positively and negatively so as to drive the gate to ascend and descend; the other end of the direct current motor is connected with an output shaft of the direct current motor through a coupling, and when the alternating current is lost, the output torque of the direct current motor is transmitted to the hoist through the shaft of the alternating current motor to drive the hoist to rotate positively and negatively to drive the gate to lift and descend.
The positive and negative rotating contactor is used for controlling the positive rotation and the negative rotation of the double-shaft extension motor, and the load of the hoist (including the gate) driven by the direct-current motor can be ensured to drive the gate to lift and descend at least 3 times by matching with the storage battery.
Further, the charger is provided with an alternating current input end and a charger output end, the alternating current input end is connected with an alternating current power supply end, and the charger output end is connected with a + -end of the storage battery; a backstop is connected in series with the connecting end of the storage battery and the charger; and the main shaft of the direct current motor is connected with the main shaft of the alternating current double-shaft extension motor through a coupling. After the connection, the alternating current motor and the direct current motor can independently drive the hoist to rotate positively and negatively to drive the gate to ascend and descend.
The beneficial effect of adopting above-mentioned further scheme is that can guarantee after setting up the backstop that the battery can only supply power to DC motor and can not supply power to the system reversal when the system loses the electricity.
Furthermore, the alternating current electric control unit also comprises an LCU monitoring system and an isolation transformer, wherein the input end of the isolation transformer is electrically connected with the input bus of the double-shaft extension motor, and the output end of the isolation transformer is electrically connected with the LCU monitoring system; the LCU monitoring system in the embodiment comprises a data acquisition unit, a monitoring unit, a communication unit, an information processing unit and an execution unit.
The technical scheme has the advantages that the LCU monitoring system is used for carrying out data acquisition and monitoring on a gate control production process and an alternating current and direct current motor control unit, carrying out communication through a local area network, completing control and accident handling tasks and automatically controlling actions of a main gate switch and a forward and reverse rotating contactor.
Furthermore, the AC and DC main circuits are both connected in series with a small-sized air switch with shunt release for protection.
The further scheme has the advantages that the two small air switches receive the control command of the LCU, can perform switching-on and switching-off operation, and respectively implement automatic protection on the alternating current loop and the direct current loop.
Further, an alternating current-direct current double-coil loose brake is mounted on an output shaft of the double-shaft extension motor.
The double-coil loose band-type brake coil has the advantages that the double-coil loose band-type brake coil is characterized in that the brake is released by the alternating current coil when alternating current exists; when there is no AC, the DC coil is used to release the brake.
The system further comprises an LCU monitoring system and an isolation transformer, wherein the input end of the isolation transformer is electrically connected with the input bus of the double-shaft extension motor, and the output end of the isolation transformer is also electrically connected with the LCU monitoring system; the LCU monitoring system in the embodiment comprises a data acquisition unit, a monitoring unit, a communication unit, an information processing unit and an execution unit, and is used for automatically controlling the opening and closing of the main brake switch and the forward and reverse alternating current contactors.
The technical scheme has the advantages that the opening and closing of the gate are automatically controlled through the LCU monitoring system; the automatic control gate lifting can be further realized according to the rising of the water level in front of the gate, and the gate lifting height, the gate opening time, the gate opening load and the stable gate descending can be brought into the protection monitoring range.
Further, the output end of the main brake switch is connected in series with a power supply protector, and an overload thermal relay is connected in series between the forward and reverse alternating current contactor and the double-shaft extension motor.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic circuit connection diagram of an embodiment of the emergency gate monitoring system for ac/dc motors of the present invention.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
The embodiment is basically as shown in the attached figure 1:
the emergent gate monitored control system of alternating current-direct current motor 17 in this embodiment includes: a controller, an alternating current electric control unit and a direct current control unit 13;
the alternating current electric control unit comprises a working power supply, a double-shaft extension motor 8 and a forward and reverse rotation alternating current contactor 6, a main brake switch 1 is arranged at the output end of the working power supply, and the double-shaft extension motor 8 is electrically connected with the working power supply through the forward and reverse rotation alternating current contactor 6 and the main brake switch 1;
the direct current control unit 13 comprises a charger 9, a storage battery, a coupling 18, a forward and reverse rotation direct current contactor 14 and a direct current motor 17; the positive and negative rotation direct current contactor 14 is electrically connected with a direct current motor 17, the direct current motor 17 and the double-shaft extension motor are both provided with a main shaft, and the main shaft is connected with the main shaft of the double-shaft extension motor through a coupling 18; in this embodiment, the charger 9 may be a rectifying circuit, the storage battery is charged through the rectifying circuit, the electric energy is converted into chemical energy and stored in the storage battery, and the dc control unit 13 in this embodiment further includes a power supply protector 12 connected to the charger 9;
the controller is connected with the alternating current electric control unit and the direct current control unit 13; the controller in this embodiment may be a subsequent control loop, and the subsequent control loop is composed of an LCU and related secondary devices.
The utility model has the advantages that: when the power grid is normal, the system alternating current voltage supplies power, and the gate is controlled through the forward and reverse rotating alternating current contactor 6 and the main gate switch 1; once the power consumption equipment connected with the system is interrupted by AC power supply due to reasons, the controller detects the interruption of the power supply of the AC electric control unit, the DC control unit 13 is started immediately, and the storage battery drives the DC motor 17 through the forward and reverse rotating contactor to drive the hoist to rotate forward and reverse to control the gate. Therefore, the reliability of the hydropower station flood discharge gate is greatly improved.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Optionally, in some other embodiments, the ac power control unit further includes a working electric brake switch, a circuit protection switch 3, an ac contactor 6, and an on-off machine, wherein a working power supply is introduced through the working electric brake switch and the circuit protection switch 3, and the ac contactor 6 is electrically connected to the double-shaft extension motor 8 through an ac forward/reverse rotating contactor; one output end of the double-shaft extension motor is connected with the hoist to output mechanical torque to drive the hoist to rotate positively and negatively so as to drive the gate to ascend and descend; the other end of the direct current motor 17 is connected with an output shaft of the direct current motor 17 through a coupling 18, and when the alternating current is lost, the output torque of the direct current motor 17 is transmitted to the hoist through the shaft of the alternating current motor to drive the hoist to rotate positively and negatively to drive the gate to lift and descend;
in this embodiment, the lift of motor 8 is stretched to biax through the assembly pulley control gate, this embodiment uses the asynchronous machine is stretched to the three-phase biax as the example, under the generating set normal operating condition, generating set is the electric wire netting system power supply, the biax is stretched motor 8 and is inserted into the electric wire netting system, when needing to carry out opening and close of power station gate, the three-phase alternating current power supply of the V that comes from the electric wire netting system is as working power supply and is stretched asynchronous machine power supply for the three-phase biax, through master switch 1 and positive and negative contactor to the biax and stretch motor 8 circular telegram, drive the gate and rise or. In a normal state, the charger 9 of the direct current control unit 13 charges the storage battery pack 11 through the backstop 10, and the storage battery stores enough electric energy (actually, the electric energy is converted into chemical energy for storage); when the generator set has emergency situations such as power generation interruption due to failure or failure of a power grid system, the working power supply cannot normally supply power to the double-shaft extension motor 8, at the moment, the storage battery pack 11 is protected by the direct current loop, supplies power to the direct current motor 17 through the direct current positive and negative rotation contactor and the direct current loop thermal relay 15, drives the direct current motor 17 to rotate in the positive and negative direction, the main shaft of the direct current motor 17 is connected to the main shaft of the alternating current double-shaft extension motor through the coupling 18, the main shaft of the alternating current double-shaft extension motor drives the opening and closing machine to operate, lifting and descending control of a gate is implemented, and emergency operation of.
The forward and reverse rotating contactor is used for controlling the forward rotation and the reverse rotation of the double-shaft extension motor 8, and the load of a hoist (including a gate) driven by the direct-current motor 17 can be ensured to drive the gate to lift and descend at least 3 times by matching with the storage battery.
Optionally, in some other embodiments, the charger 9 is provided with an ac input terminal and a charger 9 output terminal, the ac input terminal is connected to an ac power supply terminal, and the charger 9 output terminal is connected to the + -terminal of the storage battery; a backstop 10 is connected in series with the connecting end of the storage battery and the charger 9; and the main shaft of the dc motor 17 is connected to the main shaft of the ac biaxial tension motor via a coupling 18. After the connection, the alternating current motor and the direct current motor 17 can independently drive the hoist to rotate positively and negatively to drive the gate to ascend and descend.
The provision of the backstop 10 ensures that the battery can only supply power to the dc motor 17 and cannot supply power back to the system in the event of a system loss of power.
Optionally, in some other embodiments, the ac electric control unit further includes an LCU monitoring system 5 and an isolation transformer 4, an input end of the isolation transformer 4 is electrically connected to the input bus of the dual-axis motor 8, and an output end of the isolation transformer 4 is electrically connected to the LCU monitoring system 5; the LCU monitoring system 5 in this embodiment includes a data acquisition unit, a monitoring unit, a communication unit, an information processing unit, and an execution unit.
The LCU monitoring system 5 is used for carrying out data acquisition and monitoring on a gate control production process and a control unit of an alternating current and direct current motor 17, carrying out communication through a local area network, completing control and accident handling tasks and automatically controlling the actions of a main gate switch 1 and a forward and reverse rotating contactor.
Optionally, in some other embodiments, the ac and dc main circuits are both connected in series with a small air switch with shunt release for protection.
The two small air switches receive the control command of the LCU, can perform switching-on and switching-off operations, and respectively implement automatic protection on an alternating current loop and a direct current loop.
Optionally, in some other embodiments, an alternating current-direct current double-coil loose brake is mounted on an output shaft of the double-shaft extension motor 8; in this embodiment, an ac/dc release brake coil 16 is installed on an output shaft of the double-shaft extension motor 8, an ac/dc double-coil release brake is connected in parallel with the ac motor, and a dc release brake coil is connected in parallel with the dc motor 17, so that the release brake coil can be electrified regardless of whether the ac motor or the dc motor 17 acts to lift or release the brake, the brake is released when the motor rotates, the release brake coil is immediately powered off when the motor is powered off and stops rotating, the brake immediately holds the hoist shaft tightly, and the gate is ensured to be fixed at the position when the motor is powered off and not fall down due to self weight. The opening and closing of the gate are automatically controlled through an LCU monitoring system 5; the automatic control gate lifting can be further realized according to the rising of the water level in front of the gate, and the gate lifting height, the gate opening time, the gate opening load and the stable gate descending can be brought into the protection monitoring range.
The double-coil loose band-type brake coil is characterized in that the brake is released by an alternating current coil when alternating current exists; when there is no AC, the DC coil is used to release the brake.
Optionally, in some other embodiments, the system further includes an LCU monitoring system 5 and an isolation transformer 4, an input end of the isolation transformer 4 is electrically connected to an input bus of the dual-axis motor 8, and an output end of the isolation transformer 4 is also electrically connected to the LCU monitoring system 5; the LCU monitoring system 5 in the embodiment comprises a data acquisition unit, a monitoring unit, a communication unit, an information processing unit and an execution unit, and is used for automatically controlling the opening and closing of the main brake switch 1 and the forward and reverse alternating current contactor 6.
The opening and closing of the gate are automatically controlled through an LCU monitoring system 5; the automatic control gate lifting can be further realized according to the rising of the water level in front of the gate, and the gate lifting height, the gate opening time, the gate opening load and the stable gate descending can be brought into the protection monitoring range.
Optionally, in some other embodiments, the output end of the main brake switch 1 is connected in series with the power supply protector 2, and the passing heat carrier relay 7 is connected in series between the forward and reverse rotating ac contactor 6 and the double-shaft extension motor 8.
It should be noted that the above embodiments are product embodiments corresponding to the above method embodiments, and for the description of each structural device and the optional implementation in this embodiment, reference may be made to the corresponding description in the above method embodiments, and details are not repeated herein.
The reader should understand that in the description of this specification, reference to the description of the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. An emergency gate monitoring system for an alternating current/direct current motor, comprising:
the controller, the alternating current electric control unit and the direct current control unit;
the alternating current electric control unit comprises a working power supply, a double-shaft extension motor and a positive and negative rotation alternating current contactor, a main brake switch is arranged at the output end of the working power supply, and the double-shaft extension motor is electrically connected with the working power supply through the positive and negative rotation alternating current contactor and the main brake switch;
the direct current control unit comprises a charger, a storage battery, a coupling, a forward and reverse direct current contactor and a direct current motor; the positive and negative rotation direct current contactor is electrically connected with the direct current motor, the direct current motor and the double-shaft extension motor are both provided with a main shaft, and the main shaft is connected with the main shaft of the double-shaft extension motor through the coupling;
the controller is connected with the alternating current electric control unit and the direct current control unit.
2. The ac/dc motor emergency gate monitoring system according to claim 1, wherein: the alternating current control unit specifically comprises a working electric brake switch, a loop protection switch, an alternating current contactor and a hoist, the working power supply is led in through the working electric brake switch and the loop protection switch, and the alternating current contactor is electrically connected with the double-shaft extension motor through an alternating current positive and negative rotating contactor; one output end of the double-shaft extension motor is connected with the hoist to output mechanical torque to drive the hoist to rotate positively and negatively so as to drive the gate to ascend and descend; the other end of the direct current motor is connected with an output shaft of the direct current motor through a coupling, and when the alternating current is lost, the output torque of the direct current motor is transmitted to the hoist through the shaft of the alternating current motor to drive the hoist to rotate positively and negatively to drive the gate to lift and descend.
3. The ac/dc motor emergency gate monitoring system according to claim 1, wherein: the charger is provided with an alternating current input end and a charger output end, the alternating current input end is connected with an alternating current power supply end, and the charger output end is connected with the + -end of the storage battery; a backstop is connected in series with the connecting end of the storage battery and the charger; the main shaft of the direct current motor is connected with the main shaft of the alternating current double-shaft extension motor through a coupling; after the connection, the alternating current motor and the direct current motor can independently drive the hoist to rotate positively and negatively to drive the gate to ascend and descend.
4. The ac/dc motor emergency gate monitoring system according to claim 1, wherein: the alternating current electric control unit further comprises an LCU monitoring system and an isolation transformer, wherein the input end of the isolation transformer is electrically connected with the input bus of the double-shaft extension motor, and the output end of the isolation transformer is electrically connected with the LCU monitoring system; the LCU monitoring system of the monitoring system comprises a data acquisition unit, a monitoring unit, a communication unit, an information processing unit and an execution unit.
5. The ac/dc motor emergency gate monitoring system according to claim 1, wherein: the AC and DC main circuits are connected in series with a small air switch with shunt release for protection.
6. The ac/dc motor emergency gate monitoring system according to claim 1, wherein: an alternating current-direct current double-coil loose brake is mounted on an output shaft of the double-shaft extension motor.
7. The ac/dc motor emergency gate monitoring system according to claim 1, wherein: the system comprises a double-shaft extension motor, an LCU monitoring system and an isolation transformer, wherein the input end of the isolation transformer is electrically connected with an input bus of the double-shaft extension motor, and the output end of the isolation transformer is also electrically connected with the LCU monitoring system; the LCU monitoring system of the monitoring system comprises a data acquisition unit, a monitoring unit, a communication unit, an information processing unit and an execution unit, and is used for automatically controlling the opening and closing of the main brake switch and the forward and reverse alternating current contactors.
8. The ac/dc motor emergency gate monitoring system according to claim 1, wherein: the output end of the main brake switch is connected in series with a power supply protector, and an overload thermal relay is connected in series between the forward and reverse alternating current contactor and the double-shaft extension motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922185702.2U CN211498753U (en) | 2019-12-09 | 2019-12-09 | Emergency gate monitoring system for alternating current/direct current motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922185702.2U CN211498753U (en) | 2019-12-09 | 2019-12-09 | Emergency gate monitoring system for alternating current/direct current motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211498753U true CN211498753U (en) | 2020-09-15 |
Family
ID=72414316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922185702.2U Expired - Fee Related CN211498753U (en) | 2019-12-09 | 2019-12-09 | Emergency gate monitoring system for alternating current/direct current motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211498753U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114576412A (en) * | 2022-03-11 | 2022-06-03 | 四川水利职业技术学院 | Control system with runner protection and energy storage type hydropower station gate or valve |
-
2019
- 2019-12-09 CN CN201922185702.2U patent/CN211498753U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114576412A (en) * | 2022-03-11 | 2022-06-03 | 四川水利职业技术学院 | Control system with runner protection and energy storage type hydropower station gate or valve |
| CN114576412B (en) * | 2022-03-11 | 2022-09-23 | 四川水利职业技术学院 | Control system with runner protection and energy storage type hydropower station gate or valve |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105186588B (en) | Arc flash protection battery energy storage system, conversion system and protection method | |
| CA2784306C (en) | Control method for low voltage ride through | |
| CN102005779B (en) | Converter-based low voltage ride through control system of wind generating set | |
| CN103217641A (en) | Device and method for testing CROWBAR circuit of wind power converter | |
| CN106533148A (en) | Photovoltaic inverter having emergency stop function and emergency stop method for photovoltaic inverter | |
| CN105048497A (en) | Doubly-fed wind turbine generator low-voltage ride through method | |
| CN211498753U (en) | Emergency gate monitoring system for alternating current/direct current motor | |
| CN205790256U (en) | A kind of power battery pack security protection module cascaded | |
| CN202309058U (en) | Pressure-sensitive energy consumption brake protection circuit | |
| CN110661290B (en) | Low-water-head hydropower intelligent control system and method | |
| CN203014354U (en) | Circuit for controlling auxiliary device of large units | |
| CN102684158A (en) | Overheat delay protection device for motor | |
| CN105932344A (en) | Cascadable power battery pack safety protection module | |
| CN212435345U (en) | Waste heat utilization generating set and protection device thereof | |
| CN101672244B (en) | Power loss protecting device of fast-stopping electromagnetic valve of hydraulic turbine governor | |
| CN205725140U (en) | A kind of machine supplying powder reactance voltage disturbance power-supply system | |
| CN211880160U (en) | Direct current motor gate monitored control system | |
| CN202474823U (en) | Integrated protection device for electromotor | |
| CN211039259U (en) | Electro-hydraulic emergency gate operating system | |
| CN214464821U (en) | One-to-two variable frequency motor accident button control wiring circuit | |
| CN201615023U (en) | Automatic power-off device after tripping operation of small-sized water wheel generator | |
| CN203911834U (en) | Oil pump power supply device used in large thermal power plant accident | |
| CN219627373U (en) | Double-fed converter stator grid-connected contactor control device | |
| CN203879683U (en) | Electric feathering control system | |
| CN208763661U (en) | Screw machine back brake door switch unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200915 Termination date: 20211209 |