CN215185865U - Medium-voltage dual-power supply automatic step-by-step switching control device with expansion function - Google Patents
Medium-voltage dual-power supply automatic step-by-step switching control device with expansion function Download PDFInfo
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- CN215185865U CN215185865U CN202120928174.XU CN202120928174U CN215185865U CN 215185865 U CN215185865 U CN 215185865U CN 202120928174 U CN202120928174 U CN 202120928174U CN 215185865 U CN215185865 U CN 215185865U
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Abstract
The utility model provides an automatic switching controlling means step by step of medium voltage dual supply with extended functionality, including embedded microprocessor, bus switch switching on/off state input circuit, bus switch switching on/off control output circuit, voltage sampling unit, current sampling unit and at least one expandable switch unit, expandable switch unit includes load switch state detection input module and load switch switching control module; the bus switch switching-on/off state input circuit, the bus switch switching-on/off control output circuit, the voltage sampling unit and the current sampling unit are respectively connected with the embedded microprocessor, and the load switch state detection input module and the load switch switching control module are respectively connected with the embedded microprocessor through RS485 interfaces.
Description
Technical Field
The utility model relates to an automatic switching controlling means step by step of middling pressure dual supply, specific theory has related to an automatic switching controlling means step by step of middling pressure dual supply with extended functionality.
Background
With the development of social economy and rapid industrial development, the application of some medium-voltage power distribution systems is greatly increased, and the simplicity, reliability, safety and stability of the power distribution systems are particularly important. The corresponding medium-voltage automatic change-over switch is also widely applied to industries such as medium and large data centers, semiconductor factories, super high-rise commercial buildings, large airports and the like. The product combines advanced electrical and mechanical design technology to realize reliable and stable switching of the medium-voltage power supply.
In order to realize stable and reliable switching of the medium-voltage power supply, a control device for gradually opening and then gradually closing load switches is needed, but due to different application environments and occasions, the number of load side switches has different requirements on the number of load switches, the switching control of the number of fixed switches is insufficient for application places with more load switches, and the waste of cost is caused for application places with less load switches.
In order to solve the above problems, people are always seeking an ideal technical solution.
Disclosure of Invention
The utility model aims at the not enough of prior art to a automatic switching controlling means step by step of middling pressure dual supply with extended functionality is provided.
In order to realize the purpose, the utility model discloses the technical scheme who adopts is: a medium-voltage dual-power supply automatic step-by-step switching control device with an expansion function comprises an embedded microprocessor, a bus switch on-off state input circuit, a bus switch on-off control output circuit, a voltage sampling unit, a current sampling unit and at least one expandable switch unit, wherein the expandable switch unit comprises a load switch state detection input module and a load switch switching control module; the bus switch switching-on/off state input circuit, the bus switch switching-on/off control output circuit, the voltage sampling unit and the current sampling unit are respectively connected with the embedded microprocessor, and the load switch state detection input module and the load switch switching control module are respectively connected with the embedded microprocessor through RS485 interfaces;
the voltage sampling unit is used for detecting medium-voltage values of two paths of buses, and the embedded microprocessor is used for outputting a bus switch switching-on and switching-off instruction to the bus switch switching-on and switching-off control output circuit according to the sampling value of the voltage sampling unit; the bus switch switching-on and switching-off control output circuit is used for executing a bus switch switching-on and switching-off instruction; the bus switch switching-on and switching-off state input circuit is used for detecting the state of a bus switch;
the current sampling unit is used for detecting the value of a load current; the embedded microprocessor is used for outputting a load switch switching-on and switching-off instruction to the load switch switching control module according to the sampling value of the current sampling unit; the load switch switching control module is used for controlling switching-on and switching-off of the load switch; the load switch state detection input module is used for detecting the working position state and the switching-on/off state of the load switch.
Based on the above, the load switch state detection input module includes at least one path of state detection circuit, and each path of state detection circuit is used for detecting the switch state of one load switch; the state detection circuit comprises an electronic transient suppression diode, a diode and an RC filter circuit, wherein one end of the electronic transient suppression diode is grounded, the other end of the electronic transient suppression diode collects switching-on and switching-off feedback signals of a load switch load, the other end of the electronic transient suppression diode is also connected with the cathode of the diode, and the anode of the diode is connected with a 5V power supply through a pull-up resistor; the anode of the diode is also connected with one end of the RC filter circuit through a current-limiting resistor, and the other end of the RC filter circuit is connected with the embedded microprocessor so as to output a load switch state to the embedded microprocessor.
Based on the above, the load switch switching control module includes at least two switch control circuits, and each of the two switch control circuits is connected to one load switch and is used for controlling the opening and closing of the load switch;
the switch control circuit comprises a relay, a triode and a diode, and the base electrode of the triode is connected with the embedded microprocessor through a resistor; the collector of the triode is connected with the coil of the relay in series and then is connected with a 5V power supply; one end of a normally open contact of the relay is connected with a common COM end of the power supply circuit, and the other end of the normally open contact of the relay is connected with the load switch; the diode is connected in parallel at two ends of the coil of the relay.
The utility model discloses relative prior art has substantive characteristics and progress, specific theory, the utility model discloses a load switch state detection input module and the load switch switching control module of extension control a plurality of load switches close a floodgate step by step and divide the floodgate step by step, have effectively avoided multistage load to close a floodgate simultaneously to busbar voltage and busbar switch's impact, make the load side steady excessively to another way power area load power supply by the power of the same kind, realized the steady transition of power to the consumer has been protected.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic circuit diagram of the present invention.
Fig. 3 is a schematic diagram of an application of the expansion scheme of the present invention.
Fig. 4 is a circuit diagram of the state detection circuit of the present invention.
Fig. 5 is a schematic circuit diagram of the switching control circuit of the present invention.
Detailed Description
The technical solution of the present invention will be described in further detail through the following embodiments.
As shown in fig. 1-3, the embodiment provides an automatic step-by-step switching control device for medium-voltage dual power supplies with an extended function, which includes an embedded microprocessor, a bus switch on/off state input circuit, a bus switch on/off control output circuit, a voltage sampling unit, a current sampling unit, and at least one extensible switch unit, where the extensible switch unit includes a load switch state detection input module and a load switch switching control module; the bus switch switching-on/off state input circuit, the bus switch switching-on/off control output circuit, the voltage sampling unit and the current sampling unit are respectively connected with the embedded microprocessor, and the load switch state detection input module and the load switch switching control module are respectively connected with the embedded microprocessor through RS485 interfaces;
the voltage sampling unit is used for detecting medium voltage values of the two buses, and in specific implementation, the voltage sampling unit comprises a voltage transformer and a voltage sampling circuit, and the voltage sampling circuit respectively samples the medium voltage values S1(A1, B1, C1, N1) and S2(A2, B2, C3, N2) of the two buses through the voltage transformer; the embedded microprocessor is used for outputting a bus switch switching-on and switching-off instruction to the bus switch switching-on and switching-off control output circuit according to the sampling value of the voltage sampling unit; the bus switch switching-on and switching-off control output circuit is used for executing a bus switch switching-on and switching-off instruction; the bus switch switching-on and switching-off state input circuit is used for detecting the state of a bus switch;
the current sampling unit is used for detecting a load current value, and in specific implementation, the current sampling unit comprises a current transformer and a current sampling circuit, and the current sampling circuit samples A, B, C three-phase load current values IA, IB and IC through the current transformer; the embedded microprocessor is used for outputting a load switch switching-on and switching-off instruction to the load switch switching control module according to the sampling value of the current sampling unit; the load switch switching control module is used for controlling switching-on and switching-off of the load switch; the load switch state detection input module is used for detecting the working position state and the switching-on/off state of the load switch.
Assuming that the bus of the S1 path is a main power supply and the bus of the S2 path is a standby power supply, the working principle of the automatic step-by-step switching control device for the medium-voltage dual power supply is as follows:
the embedded microprocessor judges whether the abnormal condition of the bus voltage exists according to the medium voltage values of the two paths of buses sampled by the voltage sampling unit, and if the abnormal condition of the main power supply voltage is detected, the embedded microprocessor controls the corresponding load switch switching control module to execute the switching-off action according to the preset number of load side switches and the set switching-off sequence and time interval; at the moment, the switching-on and switching-off states of the load switches are detected through the corresponding load switch state input detection module; after all the load switches are switched off, the bus switch of the main power supply is controlled to execute switching-off action by the bus switch switching-on and switching-off control output circuit;
after the main power supply bus switch is switched off, the bus switch of the standby power supply is controlled to execute switching-on action by a bus switch switching-on and switching-off control output circuit, and the corresponding load switch switching control module is controlled to execute switching-on action according to the set switching-on sequence and time interval according to the load switch state detected by the load switch state detection input module, the load current collected by the current sampling unit and the preset number of switches on the load side, so that the load is gradually loaded, and the impact current is prevented from being overlarge; specifically, the load current value acquired by the current sampling unit provides a basis for determining the switching-on number of the load-side switches, and after the load current value acquired by the current sampling unit is obtained, the embedded microprocessor judges whether to continue switching-on according to the load current value; for example, when the load current value after closing is greater than the set value, other load switches are not closed continuously, and overload of the equipment is prevented.
When the embedded microprocessor judges and detects that the main power supply voltage is recovered to normal according to the sampling value of the voltage sampling unit and before the standby power supply is disconnected, the embedded microprocessor controls the corresponding load switch switching control module to execute a switching-off action according to the preset number of load side switches and the set switching-off sequence and time interval; at the moment, the switching-on and switching-off states of the load switches are detected through the corresponding load switch state input detection module; after all the load switches are switched off, the bus switch of the standby power supply is controlled to execute switching-off action by the bus switch switching-on and switching-off control output circuit;
after the bus switch of the standby power supply is switched off, the bus switch of the main power supply is controlled to execute switching-on action through the bus switch switching-on/off control output circuit, the load switch state detected by the input module and the load current collected by the current sampling unit are detected according to the load switch state, the corresponding load switch switching control module is controlled to execute switching-on action according to the preset switching-on sequence and time interval according to the preset number of switches on the load side, the load is gradually loaded, the overlarge impact current is prevented, and the stable transition of the main power supply and the standby power supply is realized.
The automatic switching control device step by step of this medium voltage dual supply makes the impact of multistage load closing simultaneously to busbar voltage and busbar switch effectually avoided closing step by step of load side switch, makes the steady power of load side pass another way power on-load power supply by the power of a way to realize the steady transition of power to the consumer has been protected.
When the bus switch is used specifically, the number of the bus switch on-off state input circuits can be two, and at the moment, each bus switch on-off state input circuit is connected with one bus respectively so as to acquire the bus switch state on the bus.
When the bus switch is used specifically, the number of the bus switch on-off control output circuits can be two, and at the moment, each bus switch on-off control output circuit is connected with one bus respectively so as to control the on-off of the bus switch on the bus.
In specific implementation, the load switch state detection input module includes at least one path of state detection circuit, and each path of state detection circuit is used for detecting the switch state of one load switch.
As shown in fig. 4, the state detection circuit includes an electronic transient suppression diode, a diode and an RC filter circuit, one end of the electronic transient suppression diode is grounded, the other end of the electronic transient suppression diode collects a switching-on/off feedback signal of the load switch, the other end of the electronic transient suppression diode is further connected to a cathode of the diode, and an anode of the diode is connected to a 5V power supply through a pull-up resistor; the anode of the diode is also connected with one end of the RC filter circuit through a current-limiting resistor, and the other end of the RC filter circuit is connected with the embedded microprocessor so as to output a load switch state to the embedded microprocessor.
When the load switch is in a closing state, the cathode end of the diode can detect a low level, the diode is conducted at the moment, and the load switch state detection input module outputs the low level representing the closing state to the embedded microprocessor; when the load switch is in a switching-off state, the cathode end of the diode is suspended, the diode is cut off, and the load switch state detection input module outputs a high level representing the switching-off state to the embedded microprocessor.
In specific implementation, the load switch switching control module comprises at least two switch control circuits, and each switch control circuit is connected with one load switch and used for controlling the opening and closing of the load switch.
In specific implementation, as shown in fig. 5, the switch control circuit includes a relay, a transistor, and a diode, and a base of the transistor is connected to the embedded microprocessor through a resistor; the collector of the triode is connected with the coil of the relay in series and then is connected with a 5V power supply; one end of a normally open contact of the relay is connected with a common COM end of the power supply circuit, and the other end of the normally open contact of the relay is connected with the load switch; the diode is connected in parallel at two ends of the coil of the relay.
Specifically, one of the switch control circuits is configured to receive a switching-on instruction issued by the embedded microprocessor, and when the switching-on instruction issued by the embedded microprocessor is received, a triode of the switch control circuit is turned on, so that a coil of a relay of the switch control circuit is energized to drive a normally open contact of the relay of the switch control circuit to be closed, and the load switch is controlled to be switched on;
meanwhile, the embedded microprocessor detects the state of the load switch through a load switch state detection input module connected with the load switch, when a low level state is detected, the switch-on is considered to be successful, at the moment, the embedded microprocessor stops issuing a switch-on instruction, and a triode of the switch control circuit is cut off, so that a coil of a relay of the switch control circuit is powered off, a normally open contact of the relay is disconnected, and the switch-on is finished.
The other switch control circuit is used for receiving a brake separating instruction issued by the embedded microprocessor, and when the brake separating instruction issued by the embedded microprocessor is received, a triode of the switch control circuit is conducted, so that a coil of a relay of the switch control circuit is electrified to drive a normally open contact of the relay of the switch control circuit to be closed, and the load switch is controlled to be switched off;
and at the moment, the embedded microprocessor detects the state of the load switch through a load switch state detection input module connected with the load switch, when a suspended state is detected, the opening is considered to be successful, the embedded microprocessor stops issuing an opening instruction at the moment, and a triode of the switch control circuit is cut off, so that a coil of a relay of the switch control circuit is powered off, a normally open contact of the relay is disconnected, and the opening is finished.
Further, the automatic step-by-step switching control device for the medium-voltage dual power supply further comprises a display screen, and preferably, the display screen adopts a 240 × 132 dot matrix liquid crystal screen; the display screen is connected with the embedded microprocessor and used for displaying the voltage values and the states of the two paths of buses, the load current values and the on-off states of the load switches.
Specifically, the embedded microprocessor monitors the load switch state detected by the input module according to the load switch state, judges whether the load switch is successfully switched on or successfully switched off, and displays the judgment result on the LCD (liquid crystal display) so as to conveniently check whether the switch is successfully switched on or switched off and whether the load switch has a fault.
Further, the automatic step-by-step switching control device for the medium-voltage dual power supply further comprises an upper computer communication module, wherein the upper computer communication module is used for connecting the embedded processor with an upper computer through an RS485 or a USB and is used for receiving a control instruction sent by the upper computer or uploading two paths of bus voltage values and states, load current values and load switch on-off states to the upper computer.
Further, the automatic step-by-step switching control device for the medium-voltage dual power supply further comprises a key circuit and an EEPROM (electrically erasable programmable read-only memory) storage module, wherein the key circuit is connected with the embedded processor and is used for manually inputting a bus switch switching-on/off instruction and a load switch switching-on/off instruction and setting operation configuration parameters; the EEPROM storage module is connected with the embedded microprocessor through an SPI bus and used for storing operation configuration parameters, alarm records and fault data.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (6)
1. The utility model provides an automatic switching controlling means step by step of middling pressure dual supply with extended functionality which characterized in that: the system comprises an embedded microprocessor, a bus switch on-off state input circuit, a bus switch on-off control output circuit, a voltage sampling unit, a current sampling unit and at least one expandable switch unit, wherein the expandable switch unit comprises a load switch state detection input module and a load switch switching control module; the bus switch switching-on/off state input circuit, the bus switch switching-on/off control output circuit, the voltage sampling unit and the current sampling unit are respectively connected with the embedded microprocessor, and the load switch state detection input module and the load switch switching control module are respectively connected with the embedded microprocessor through RS485 interfaces;
the voltage sampling unit is used for detecting medium-voltage values of two paths of buses, and the embedded microprocessor is used for outputting a bus switch switching-on and switching-off instruction to the bus switch switching-on and switching-off control output circuit according to the sampling value of the voltage sampling unit; the bus switch switching-on and switching-off control output circuit is used for executing a bus switch switching-on and switching-off instruction; the bus switch switching-on and switching-off state input circuit is used for detecting the state of a bus switch;
the current sampling unit is used for detecting the value of a load current; the embedded microprocessor is used for outputting a load switch switching-on and switching-off instruction to the load switch switching control module according to the sampling value of the current sampling unit; the load switch switching control module is used for controlling switching-on and switching-off of the load switch; the load switch state detection input module is used for detecting the working position state and the switching-on/off state of the load switch.
2. The automatic stage-by-stage switching control device for the medium-voltage dual power supply according to claim 1, characterized in that: the load switch state detection input module comprises at least one path of state detection circuit, and each path of state detection circuit is used for detecting the switch state of one load switch; the state detection circuit comprises an electronic transient suppression diode, a diode and an RC filter circuit, wherein one end of the electronic transient suppression diode is grounded, the other end of the electronic transient suppression diode collects switching-on and switching-off feedback signals of a load switch, the other end of the electronic transient suppression diode is also connected with the cathode of the diode, and the anode of the diode is connected with a 5V power supply through a pull-up resistor; the anode of the diode is also connected with one end of the RC filter circuit through a current-limiting resistor, and the other end of the RC filter circuit is connected with the embedded microprocessor so as to output a load switch state to the embedded microprocessor.
3. The automatic stage-by-stage switching control device for the medium-voltage dual power supply according to claim 1, characterized in that: the load switch switching control module comprises at least two switch control circuits, and each two switch control circuits are used for controlling the switching-on and switching-off of one load switch;
the switch control circuit comprises a relay, a triode and a diode, and the base electrode of the triode is connected with the embedded microprocessor through a resistor; the collector of the triode is connected with the coil of the relay in series and then is connected with a 5V power supply; one end of a normally open contact of the relay is connected with a common COM end of the power supply circuit, and the other end of the normally open contact of the relay is connected with the load switch; the diode is connected in parallel at two ends of the coil of the relay.
4. The automatic stage-by-stage switching control device for the medium-voltage dual power supply according to claim 1, characterized in that: the display screen is connected with the embedded microprocessor and used for displaying the voltage values and the states of the two paths of buses, the load current values and the switching-on and switching-off states of the load switches.
5. The automatic stage-by-stage switching control device for the medium-voltage dual power supply according to claim 1, characterized in that: the embedded processor is connected with the upper computer through an RS485 or a USB and used for receiving a control instruction sent by the upper computer or uploading a voltage value and a state of two paths of buses, a load current value and a switching-on/off state of a load switch to the upper computer.
6. The automatic stage-by-stage switching control device for the medium-voltage dual power supply according to claim 1, characterized in that: the system also comprises a key circuit and an EEPROM storage module, wherein the key circuit is connected with the embedded processor and is used for manually inputting a bus switch switching-on/off instruction and a load switch switching-on/off instruction and setting operation configuration parameters; the EEPROM storage module is connected with the embedded microprocessor through an SPI bus and used for storing operation configuration parameters, alarm records and fault data.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120928174.XU CN215185865U (en) | 2021-04-30 | 2021-04-30 | Medium-voltage dual-power supply automatic step-by-step switching control device with expansion function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120928174.XU CN215185865U (en) | 2021-04-30 | 2021-04-30 | Medium-voltage dual-power supply automatic step-by-step switching control device with expansion function |
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| CN215185865U true CN215185865U (en) | 2021-12-14 |
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| CN202120928174.XU Active CN215185865U (en) | 2021-04-30 | 2021-04-30 | Medium-voltage dual-power supply automatic step-by-step switching control device with expansion function |
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