CN116345410A - Mining intrinsically safe high-voltage switch protection controller - Google Patents
Mining intrinsically safe high-voltage switch protection controller Download PDFInfo
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- CN116345410A CN116345410A CN202310076016.XA CN202310076016A CN116345410A CN 116345410 A CN116345410 A CN 116345410A CN 202310076016 A CN202310076016 A CN 202310076016A CN 116345410 A CN116345410 A CN 116345410A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B15/00—Supervisory desks or panels for centralised control or display
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B7/00—Enclosed substations, e.g. compact substations
- H02B7/06—Distribution substations, e.g. for urban network
- H02B7/08—Underground substations
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention relates to the technical field of circuit control, in particular to a mining intrinsically safe high-voltage switch protection controller, a high-voltage switch with the switch protection controller, and a transformer substation with the high-voltage switch, especially a mining underground mobile transformer substation. The modules can be disassembled into independent modules which are respectively arranged in the equipment, and can be integrally assembled together. The state of elements such as the sensor can be self-checked before equipment is put into operation, and the work with faults is avoided. The controller has universality and is suitable for high-voltage distribution equipment such as a mining high-voltage distribution device, a mining general distribution box, a mining high-voltage switch for a mobile substation and the like.
Description
Technical Field
The invention relates to the technical field of circuit control, in particular to a mining intrinsically safe high-voltage switch protection controller, a high-voltage switch with the switch protection controller, and a transformer substation with the high-voltage switch, and particularly relates to a mining underground mobile transformer substation.
Background
The intelligent construction of the coal mine is accelerated, and the intelligent construction is a core technical support for promoting transformation, upgrading and high-quality development of the coal industry. On the one hand, through intellectualization and unmanned, the risk of disaster accidents can be avoided for miners to directly face, misoperation of personnel is reduced, and potential safety hazards in production are eliminated greatly. On the other hand, through intelligent construction, the flexible production capacity of the coal mine is improved, and the supply quality and the supply elasticity are enhanced.
In the intelligent development of coal mines, the high-voltage switch equipment of the coal mines is a key node of underground power transmission and distribution and is a key link of underground intelligence. The existing high-voltage switch protection controller only comprises basic three-phase current, voltage and zero sequence voltage display, setting and protection, has the special characteristic, and is not mixable with different platforms. A situation may occur in which the protection controller is not adapted.
Disclosure of Invention
In order to solve the above technical problems. The invention discloses a mining intrinsic safety type high-voltage switch protection controller, which actively or passively controls the switching-on and switching-off of a high-voltage circuit breaker, and the controller detects the parameter of a sensor to lock the circuit breaker so as to avoid fault switching-on; the main loop is protected by comparison setting through data acquired by the sensor.
The complete technical scheme of the invention comprises the following steps:
an intrinsically safe high-voltage switch protection controller for mines, comprising: the system comprises a main control module (M1), a communication module (B0), an IO module (B1), a temperature module (B2), a current-voltage sensor pre-detection module (B3), a permanent magnet circuit breaker control module (B4, B5), a display module and an intrinsic safety power module (B6);
the main control module (M1) is connected with the display module, the main control module (M1) is connected with the communication module through optical fibers, and the communication module is respectively connected with the temperature module, the IO module, the first permanent magnet circuit breaker control module (B4) and the second permanent magnet circuit breaker control module (B5) through optical fibers, and the current and voltage sensor is a pre-detection module.
The main control module (M1) comprises a local control, a communication interface and a display interface;
the IO module (B1) comprises input and output of switching value and input and output of analog value;
the communication module (B0) is provided with an RS485, RJ45 and FC optical fiber interface;
the temperature module (B2) is provided with multiple paths of temperature detection;
the current-voltage sensor pre-detection module (B3) comprises direct current resistance detection of a constant current source generator;
the permanent magnet circuit breaker control module (B4) comprises capacitance detection, switching-on and switching-off control and position feedback;
the display module comprises a 7-inch color liquid crystal configuration display screen;
the intrinsically safe power module (B6) includes a 24v "ib" intrinsically safe protection switching power supply.
The main control module (M1) specifically comprises 3 paths of current acquisition interfaces, 1 path of zero sequence current interfaces and 1 path of system voltage interfaces; the main control module (M1) uses a 16-key simulation keyboard input in a display module powered by the intrinsic safety power supply module (B6), sets local parameters and module parameters, sets communication parameters, sets temperature module parameters, IO module parameters, current and voltage protection, sets temperature module parameters and permanent magnet breaker module parameters.
The IO interface included in the IO module (B1) is as follows: the switching-on/off switch (B1-1), the switching-off switch (B1-2), the backup switch (B1-3), the short circuit test switch (B1-4), the overload test switch (B1-5), the ready-to-complete switch (B1-6), the breaker fault switch (B1-7), the current sensor fault switch (B1-8), the voltage sensor fault switch (B1-9), the overtemperature switch (B1-10), the other fault switches (B1-11) and the three controller current sampling switches B1-12, B1-13 and B1-14, wherein the B1-12, B1-13 and B1-14 adopt 4-20 mA analog current output, and the current sampling values of the controllers can be output in the form of analog quantity according to the proportion to provide data basis for the other controllers. The three external variable switches B1-15, B1-16 and B1-17 are also included, wherein the B1-15, B1-16 and B1-17 adopt 0-10V analog voltage input, and physical quantities such as water pressure, liquid level and air quantity introduced by an external transmitter can be output in the form of analog voltage.
The voltage input of 0-10V analog quantity is adopted, different numbers of modules can be accessed according to different use conditions of the use controller, and the applicable names of the interfaces can be customized by the main control module and then displayed in the display module.
The communication module (B0) is powered by the intrinsic safety power supply module, is connected between each module and the main control module (M1) through an optical fiber interface, and is connected with external upper computer equipment of the switch through RS485, RJ45 and FC optical fiber interfaces.
The temperature module (B2) comprises 8 independent temperature units, each temperature unit comprises a mutually independent temperature detection interface, 8 paths of temperatures are detected simultaneously through connection with the PT100, and an alarm threshold value of each path of temperature can be independently set through the main control module.
The intrinsic safety power supply module comprises six paths of 24V power supply output interfaces, and is used for supplying power to a main control module, an IO module communication module, a temperature module, a display module, a current and voltage sensor pre-detection module and a permanent magnet circuit breaker control module, wherein the intrinsic safety level is 'ib'.
When the current and voltage sensor pre-detection module is in a separated position in the front isolation of the system, the keyboard is used for operation, the main control module controls the current and voltage sensor pre-detection module to sequentially test loop resistance of secondary side loops of the current and voltage sensors, test results are compared with parameters set by the main control module, the display module prompts the results, and if the results exceed the range, audible and visual alarms are sent out.
After the main system is started, the permanent magnet circuit breaker module detects the capacity of the position switch and the capacity of the capacitor, compares the set parameters, prompts locking or preparation to be completed, and can carry out a closing request of the main circuit, which is provided by the controller, after the preparation is completed.
The high-voltage switch protection controller is applied to high-voltage switch equipment provided with a front-end isolation element, and is applicable to different types of high-voltage switches through parameter setting and module selection.
Compared with the prior art, the invention has the following beneficial effects:
the mining intrinsic safety type high-voltage switch protection controller is split type modularized, and each module can be disassembled into independent modules which are respectively arranged in the equipment, and can be integrally assembled together. And an intelligent module for pre-detecting each key sensor and energy storage element in the switch. The controller is an ib-level protection intrinsic safety type controller, and an IO module, a communication module, a keyboard control interface and a temperature interface led out to a non-safety area are not limited by the environment.
Because the optical fiber transmission is adopted among the modules, the data transmission among the modules cannot be affected by arc radiation generated by opening and closing of the circuit breaker in the high-voltage chamber, and a proprietary protocol is adopted among the modules, so that the data transmission speed is within 5 ms. The current and voltage sensor pre-detection module in the controller can self-detect the states of elements such as the sensor and the like before equipment is put into the controller, so that the operation with faults is avoided. The controller has universality and is suitable for high-voltage distribution equipment such as a mining high-voltage distribution device, a mining general distribution box, a mining high-voltage switch for a mobile substation and the like.
Drawings
Fig. 1 is a schematic diagram of a circuit structure of a mining intrinsic safety type high-voltage switch protection controller applied to a full class module.
Fig. 2 is a schematic diagram of a multifunctional distribution device of a mining underground substation with a high-voltage switch protection controller according to the invention.
Description of the embodiments
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only examples and are not intended to limit the present application.
The disclosure of the present invention is schematically illustrated below.
The invention discloses a mining intrinsic safety type high-voltage switch protection controller structure, as shown in figure 1, which is applied to various high-voltage switch equipment, and comprises a main control module M1, an IO module B1, a communication module B0, a temperature module B2, a current and voltage sensor pre-detection module B3, a permanent magnet breaker control module B4, a display module and an intrinsic safety power supply module B6, wherein the mining intrinsic safety type high-voltage switch protection controller structure is not limited to be used by each module, can be repeatedly applied by the same module, has special functions, and adjusts setting parameters according to different types and installation positions of a switch.
The main control module M1 is connected with the communication module B0 through optical fibers. IO module B1, temperature module B2, current-voltage sensor pre-detection module B3, permanent magnetism circuit breaker control module B4, B5, display module, this ampere of power module B6 also is connected to communication module through optic fibre.
The main control module M1 is connected with the display module through the serial port RS232, the running state of the system is set in the display screen, and the parameter setting is stored in the main control module.
IO module B1 includes separating brake switch B1-1, closing switch B1-2, backup switch B1-3, short circuit test switch B1-4, overload test switch B1-5, ready to accomplish switch B1-6, circuit breaker fault switch B1-7, current sensor fault switch B1-8, voltage sensor fault switch B1-9, overtemperature switch B1-10, other fault switches B1-11, insert permanent magnetism circuit breaker control module B4 respectively, every switch accessible software shields.
The current sampling values of the controllers can be output in the form of analog quantity according to the proportion by adopting 4-20 mA analog quantity current output of the B1-12, the B1-13 and the B1-14, and data basis is provided for other controllers. B1-15, B1-16 and B1-17 adopt 0-10V analog voltage input, and external transmitters can be introduced, such as water pressure, liquid level, air quantity and the like.
The communication module B0 is connected between the main module and other modules, and the module transmits the data of the main control module M1 to an upper computer system of the unsafe zone through an optical fiber/RJ 45/RS 485.
The temperature module B2 includes 8 temperature detection loops as shown in fig. 1. T1-T5 respectively detect QS isolating switch, QF circuit breaker main loop, busbar cable temperature, CT current sensor temperature, PT power transformer temperature. According to the mining safety requirements, PT100 is selected, collected data is compared with parameters of a main control module, the data is transmitted to an IO module B1, a main loop is disconnected or locked, and the safe operation of equipment is ensured. The temperature data collected by the temperature module often generate certain noise due to the complex underground environment and the precision problem of the temperature sensor, and the cost of immediately alarming and stopping is too high for the situation. If it cannot be determined whether the noise is generated or the data acquisition is normal, the manual inspection mode is difficult and accidents are easy to cause in the underground environment. Thus, in order to solve the problem, the present invention processes the collected temperature data, specifically, processes the historical data collected by combining with the temperature module, including: the temperature module selects the temperature measurement of the current time and the temperature measurement data of 9 times continuously before to obtain 10 times of temperature data, and records the 10 times of temperature data as data T 0 To T 9 . Normalization was performed on each data Ti divided by the maximum of 10 temperature data and T' i Subsequent calculation of
Wherein->
Is T' i Is a mean arithmetic value of (c). When M is greater than 0.01, the temperature data is temporarily set as the first abnormality, and the arithmetic average value of the 9 previous temperature data is temporarily replaced by the arithmetic average value as the current temperature measurement value to carry out the next operation. If no abnormality occurs in the next temperature measurement, continuing to measure the temperature according to a normal program; if 3 anomalies appear continuously, it is determined that the 3 temperature data are not noise, and the arithmetic average value before is replaced by the real temperature measurement value. And if the alarm threshold is reached, immediately alarming.
And the current-voltage sensor pre-detection module B3 transmits PT and CT test data to the IO module B1 through optical fibers under the condition of QS breaking through the operation of the display module.
The display module is a resistive type intrinsic safety display screen powered by the intrinsic safety power supply module B5, the screen display size is 7 inches, the display module has 400nit brightness, and meanwhile, the buzzer is embedded, and when the system fails, the alarm can be given out sound and light simultaneously.
The above scheme is only used as an example, and the number and arrangement positions of each module can be customized. The controller can flexibly apply the types and the number of the modules, and is not limited to one application in fig. 1.
Furthermore, the invention also discloses a mining underground mobile substation, which comprises a box body, wherein the box body is divided into a high-voltage chamber, a low-voltage chamber, a transformation chamber and a control chamber through a partition board, the high-voltage chamber is internally provided with high-voltage equipment, the low-voltage chamber is internally provided with low-voltage equipment, the transformation chamber is internally provided with a transformer, the control chamber is internally provided with control equipment, and the partition board is provided with terminals and cable channels for installing, connecting and communicating all parts of equipment. The high-voltage equipment comprises a high-voltage switch cabinet, a high-voltage vacuum switch is arranged in the high-voltage switch cabinet, the high-voltage vacuum switch is protected by adopting the high-voltage switch protection controller, and the high-voltage switch is used for conducting circuit breaking operation through a mining high-voltage vacuum switch composite circuit breaker.
The component structure of the high-voltage vacuum switch composite breaker is as follows: the permanent magnet circuit breaker comprises a control power supply installation chamber, a permanent magnet mechanism installation chamber, a mechanical circuit breaker mechanism and a permanent magnet circuit breaker mechanism, wherein the mechanical circuit breaker mechanism is positioned in the mechanical mechanism installation chamber, and the permanent magnet circuit breaker mechanism is positioned in the permanent magnet mechanism installation chamber.
The permanent magnet switch controller is arranged in the control power supply installation chamber and controls the permanent magnet breaking mechanism to operate, and the permanent magnet breaking mechanism adopts a mode of combining a tripping permanent magnet mechanism with mechanical hand tripping.
The low-voltage indoor low-voltage power distribution cabinet comprises a wire inlet input part, a sub-control part and an output part, wherein the output part is provided with a starter and a frequency converter, and the frequency converter adopts a three-level four-quadrant frequency conversion machine core and is matched with a multifunctional power distribution device. And a voltage and current transformer is arranged on motor equipment connected with the transformer substation.
The multifunctional power distribution device with the oil temperature and oil level protection function is shown in fig. 2, and comprises a comprehensive protector based on a PLC, a display screen, an intermediate relay set KA, a contact relay set KJ, a vacuum alternating current contactor set KM, an isolated phase change switch and an explosion-proof shell;
the isolated phase change switch is connected with an alternating current vacuum contactor set KM, the alternating current vacuum contactor set KM is connected with an intermediate relay set KA, and the intermediate relay set KA and a contact relay set KJ are respectively connected with the comprehensive protector. The comprehensive protector calculates and then controls the intermediate relay group KA and the contact relay group KJ through a PLC program, and then the intermediate relay KA group controls the vacuum alternating current contactor group KM.
The vacuum alternating-current contactor group KM comprises a first vacuum alternating-current contactor KM1, a second vacuum alternating-current contactor KM2, a third vacuum alternating-current contactor KM3, a fourth vacuum alternating-current contactor KM4, a fifth vacuum alternating-current contactor KM5 and a sixth vacuum alternating-current contactor KM6.
The contact relay group KJ comprises a first contact relay KJ1, a second contact relay KJ2, a third contact relay KJ3, a fourth contact relay KJ4, a fifth contact relay KJ5 and a sixth contact relay KJ6.
The intermediate relay group KA comprises a first intermediate relay KA1, a second intermediate relay KA2, a third intermediate relay KA3, a fourth intermediate relay KA4, a fifth intermediate relay KA5 and a sixth intermediate relay KA6.
The isolating phase change switch comprises a first isolating switch and a second isolating switch, wherein the first isolating switch is connected with the front three alternating current vacuum contactors KM1-KM3, and the second isolating switch is connected with the rear three alternating current vacuum contactors KM4-KM6.
The comprehensive protector is connected with a display screen, the PLC and the display screen are internally provided with software programs subjected to verification and optimization, and the display screen is provided with a man-machine interaction interface;
the multifunctional power distribution device can be used as a matching of a mining frequency converter, wherein a first alternating current vacuum contactor KM1 is connected with a fourth alternating current vacuum contactor KM4 in parallel, a second alternating current vacuum contactor KM2 is connected with a fifth alternating current vacuum contactor KM5 in parallel, and a third alternating current vacuum contactor KM3 is connected with a sixth alternating current vacuum contactor KM6 in parallel; then the first 3 alternating current vacuum contactors (namely, a first alternating current vacuum contactor, a second alternating current vacuum contactor and a third alternating current vacuum contactor) are used as isolation elements of a mining frequency converter to be connected with the mining frequency converter, and the mining frequency converter is respectively connected with 3 motors (a first motor M1, a second motor M2 and a third motor M3); the last 3 alternating current vacuum contactors (namely, a fourth alternating current vacuum contactor, a fifth alternating current vacuum contactor and a sixth alternating current vacuum contactor) are directly connected with the 3 motors M1-M3 as a power frequency standby loop of the mining frequency converter. The 6 contact relays KJ1-KJ6 are respectively connected with 3 electric ball valves of the 3 mining frequency converters, respectively supply power to the 3 electric ball valves and control the 3 electric ball valves.
The multifunctional power distribution device can be used for controlling and protecting the water pump oil pumps, and 6 water pump oil pumps are directly connected to 6 vacuum alternating current contactors KM of the device.
The device comprises a water tank oil cylinder, wherein 8 sensors including 4 oil temperatures, 3 oil levels and 1 liquid level are connected to a comprehensive protector, the comprehensive protector is connected to the device, the setting of overrun threshold values of the liquid levels, the oil levels and the oil temperatures is carried out through a man-machine interaction interface of a display screen, real-time values of the liquid levels, the oil levels and the oil temperatures can be displayed in real time, after the real-time values of the liquid levels, the oil levels and the oil temperatures are set according to actual requirements on site, the automatic control of the oil temperatures, the oil levels and the liquid levels is realized through calculation of software programs in a PLC according to the real-time values, when the set threshold values are reached, the corresponding alternating current contactor is automatically switched on or automatically switched off, and when the overrun occurs, a red alarm frame is popped up by the display screen to prompt overrun alarm.
The above applications are only some of the embodiments of the present application. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the inventive concept.
Claims (10)
1. An intrinsically safe high-voltage switch protection controller for mines, comprising: the system comprises a main control module (M1), a communication module (B0), an IO module (B1), a temperature module (B2), a current-voltage sensor pre-detection module (B3), a permanent magnet circuit breaker control module (B4, B5), a display module and an intrinsic safety power module (B6).
2. The mining intrinsically-safe high-voltage switch-protection controller of claim 1, wherein the master control module (M1) comprises a local control, communication interface, display interface; the IO module (B0) comprises input and output of switching value and input and output of analog value; the communication module (B1) is provided with an RS485, RJ45 and FC optical fiber interface; the temperature module (B2) is provided with multiple paths of temperature detection; the current-voltage sensor pre-detection module (B3) comprises direct current resistance detection of a constant current source generator; the permanent magnet circuit breaker control module (B4) comprises capacitance detection, switching-on and switching-off control and position feedback; the display module (B5) comprises a 7-inch color liquid crystal configuration display screen; the intrinsically safe power module (B6) includes a 24v "ib" intrinsically safe protection switching power supply.
3. The mining intrinsically-safe high-voltage switch protection controller of claim 2, wherein the high-voltage switch protection controller is applied to high-voltage switch equipment provided with a front-end isolation element, and is applicable to different types of high-voltage switches through parameter setting and module selection.
4. A mining intrinsically safe high-voltage switch-protection controller according to any one of claims 1-3, characterized in that the main control module (M1) comprises in particular 3 current acquisition interfaces and 1 zero sequence current interface, and 1 system voltage interface; the main control module (M1) uses a 16-key simulation keyboard input in a display module powered by the intrinsic safety power supply module (B6), sets local parameters and module parameters, sets communication parameters, sets temperature module parameters, IO module parameters, current and voltage protection, sets temperature module parameters and permanent magnet breaker module parameters.
5. The intrinsically-safe high-voltage switch-protection controller of claim 4, wherein the IO block (B0) comprises an IO interface: the switching-on/off switch (B1-1), the switching-off switch (B1-2), the backup switch (B1-3), the short circuit test switch (B1-4), the overload test switch (B1-5), the ready-to-complete switch (B1-6), the breaker fault switch (B1-7), the current sensor fault switch (B1-8), the voltage sensor fault switch (B1-9), the overheat switch (B1-10) and other fault switches (B1-11), wherein B1-12, B1-13 and B1-14 adopt 4-20 mA analog current output, B1-15, B1-16 and B1-17 adopt 0-10V analog voltage input, different numbers of modules can be accessed according to different use conditions of the use controller, and the applicable names of the interfaces can be displayed in the display module after being customized by the main control module.
6. The mining intrinsically safe high-voltage switch protection controller of claim 4, wherein the communication module (B0) is powered by the intrinsically safe power module, and is connected between each module and the main control module (M1) through an optical fiber interface, and the communication module (B0) is connected with external upper computer equipment of the switch through RS485, RJ45 and FC optical fiber interfaces.
7. The mining intrinsically safe high-voltage switch protection controller of claim 4, wherein the temperature module (B2) comprises 8 separate temperature units each having a mutually independent temperature detection interface, and the alarm threshold of each temperature can be set separately by the master control module by connecting the PT100 and simultaneously detecting 8 paths of temperatures.
8. The mining intrinsically safe high-voltage switch protection controller of claim 4, wherein the intrinsically safe power module comprises six paths of 24V power output interfaces for supplying power to the main control module, the IO module communication module, the temperature module, the display module, the current-voltage sensor pre-detection module and the permanent magnet circuit breaker control module, and the intrinsic safety level is "ib".
9. The mining intrinsically safe high-voltage switch protection controller of claim 4, wherein the current-voltage sensor pre-detection module is operated by a keyboard when the system is in a separated position in front of isolation, the main control module controls the current-voltage sensor pre-detection module to sequentially perform loop resistance test on secondary side loops of the current and voltage sensors, the test result is compared with parameters set by the main control module, the result is prompted by the display module, and if the result exceeds the range, an audible and visual alarm is given.
10. The mining intrinsically-safe high-voltage switch-protection controller of claim 4, wherein the permanent-magnet circuit-breaker module detects the position switch and capacitance capacity after the main system is started, compares the set parameters, prompts locking or preparation for completion, and can perform a closing request of the main circuit proposed by the controller after the preparation for completion.
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| CN202310076016.XA CN116345410A (en) | 2023-02-07 | 2023-02-07 | Mining intrinsically safe high-voltage switch protection controller |
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| CN117134295A (en) * | 2023-07-10 | 2023-11-28 | 中国矿业大学 | Solid-state switch system of underground motor and emergency stop protection control method thereof |
| CN117294025A (en) * | 2023-11-27 | 2023-12-26 | 泰安众诚自动化设备股份有限公司 | Mining high-voltage switch protection control method, system, controller and storage medium |
| CN117743106A (en) * | 2024-02-19 | 2024-03-22 | 宁波长壁流体动力科技有限公司 | Safety detection method of explosion-proof intrinsic safety type keyboard and explosion-proof intrinsic safety type keyboard |
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| CN103427343A (en) * | 2013-09-03 | 2013-12-04 | 天津华宁电子有限公司 | Mining flameproof and intrinsically-safe type load center based on high-voltage switches and low-voltage switches |
| CN114362090A (en) * | 2022-01-18 | 2022-04-15 | 上海山源电子科技股份有限公司 | Intelligent high-explosive switch for internet of things |
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| CN103427343A (en) * | 2013-09-03 | 2013-12-04 | 天津华宁电子有限公司 | Mining flameproof and intrinsically-safe type load center based on high-voltage switches and low-voltage switches |
| CN114362090A (en) * | 2022-01-18 | 2022-04-15 | 上海山源电子科技股份有限公司 | Intelligent high-explosive switch for internet of things |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117134295A (en) * | 2023-07-10 | 2023-11-28 | 中国矿业大学 | Solid-state switch system of underground motor and emergency stop protection control method thereof |
| CN117134295B (en) * | 2023-07-10 | 2024-04-16 | 中国矿业大学 | Solid-state switch system of underground motor and emergency stop protection control method thereof |
| CN117294025A (en) * | 2023-11-27 | 2023-12-26 | 泰安众诚自动化设备股份有限公司 | Mining high-voltage switch protection control method, system, controller and storage medium |
| CN117294025B (en) * | 2023-11-27 | 2024-02-27 | 泰安众诚自动化设备股份有限公司 | Mining high-voltage switch protection control method, system, controller and storage medium |
| CN117743106A (en) * | 2024-02-19 | 2024-03-22 | 宁波长壁流体动力科技有限公司 | Safety detection method of explosion-proof intrinsic safety type keyboard and explosion-proof intrinsic safety type keyboard |
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