CN110601347B - Control device and control method of low-voltage switch equipment - Google Patents
Control device and control method of low-voltage switch equipment Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/06—Arrangements for supplying operative power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The invention discloses a control device and a control method of low-voltage switch equipment, wherein the control device comprises: the voltage detection module is used for detecting the voltage, the frequency and the phase of the double power supplies; the current detection module is used for detecting the current of the double power supplies; the judging module is used for judging the effectiveness of the double power supplies and whether a feed circuit of the double power supplies breaks down; the action module is used for adjusting the state of the dual power supply side switch; the parameter setting module is used for acquiring preset reference parameters; and the power supply module is used for providing power for the voltage detection module, the current detection module, the judgment module, the action module and the parameter setting module. The invention judges the effectiveness of the voltage of the double power supplies and whether the load has a fault according to the voltage and the current of the double power supplies so as to adjust the switching state of the low-voltage switch equipment, realizes the coordination and unification of the protection function and the double power supply conversion function of the low-voltage distribution system, and effectively prevents more serious accidents caused by the fact that the double power supply conversion is still implemented when the circuit fault exists.
Description
Technical Field
The invention relates to the technical field of low-voltage distribution control, in particular to a control device and a control method for a dual-power-supply automatic switching function and a feeder circuit protection function.
Background
In a low-voltage distribution system, faults of short circuit, overload, grounding, phase loss and the like of a power supply loop are protected by disconnecting the power supply loop through a circuit breaker and a fuse; in a double-loop power distribution system with a common power supply and a standby power supply, when the common power supply fails, the power supply switching function is completed by an automatic change-over switch. The operation of the circuit breaker is controlled by a trip unit and the operation of the automatic transfer switch is controlled by a controller. When the output end of the automatic change-over switch breaks down, the tripper can drive the breaker at the side of the common power supply to be disconnected and stop supplying power, and the controller of the automatic change-over switch detects that the voltage or frequency of the common power supply fails and can drive the automatic change-over switch to be switched to the standby power supply to supply power. At this time, the line fault still exists, and the automatic transfer switch connects the standby power supply to a fault loop, so that huge energy can be generated to damage a low-voltage power distribution system.
Disclosure of Invention
Therefore, the technical problems to be solved by the invention are as follows: in a low-voltage distribution system, the circuit breaker and the automatic transfer switch equipment are controlled in a non-uniform and non-coordinated mode, when a load or a feed circuit breaks down, the circuit breaker requires to cut off power supply, the automatic transfer switch requires to be transferred to a standby power supply for continuous power supply, and huge accident potential is brought to the whole distribution system.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, an embodiment of the present invention provides a low voltage switchgear control apparatus, including: the voltage detection module is used for detecting the voltage, the frequency and the phase of the common power supply and the standby power supply; the current detection module is used for detecting the current of the common power supply and the standby power supply; the judging module is used for judging the effectiveness of the common power supply and the standby power supply and judging whether the feed loops of the common power supply and the standby power supply have faults or not; the action module is used for adjusting the states of the common power supply side switch and the standby power supply side switch according to the judgment result of the judgment module; the parameter setting module is used for acquiring preset reference parameters and comprises: voltage reference parameters of a common power supply and a standby power supply, frequency reference parameters of the common power supply and the standby power supply, current reference parameters of the common power supply and the standby power supply, and action delay parameters of a switch at the side of the common power supply and a switch at the side of the standby power supply; and the power supply module is used for providing power for the voltage detection module, the current detection module, the judgment module, the action module and the parameter setting module.
In one embodiment, the low voltage switchgear control apparatus further includes: the display module is used for displaying the detected voltages of the common power supply and the standby power supply, the currents of the common power supply and the standby power supply, the reference parameters of the voltages of the common power supply and the standby power supply, the reference parameters of the currents of the common power supply and the standby power supply, the switching state of the common power supply side and the switching state of the standby power supply side; and the communication module is used for information interaction between the control device of the low-voltage switch equipment and the remote control terminal.
In one embodiment, the voltage detection module of the low-voltage switchgear control device includes: the common power supply input transformer is used for converting common power supply voltage into preset weak current voltage; the standby power supply input transformer is used for converting the standby power supply voltage into a preset weak current voltage; and the voltage sampling circuit unit is used for acquiring voltage, frequency and phase sampling signals of the common power supply and the standby power supply.
In one embodiment, the low voltage switchgear control apparatus, the current detection module includes: the current transformer at the input end of the common power supply is used for converting the current of the common power supply into a current signal which can be sampled by the current sampling circuit unit; the standby power supply input end current transformer is used for converting standby power supply current into a current signal which can be sampled by the current sampling circuit unit; and the current sampling circuit unit is used for acquiring current sampling signals of the current of the common power supply and the standby power supply.
In an embodiment, the low voltage switchgear control apparatus, the determining module includes: the switching state detection unit is used for acquiring the switching state of the common power supply side and the switching state of the standby power supply side; and the main processor is used for generating a judgment result according to the reference parameters, the voltage sampling signal, the frequency sampling signal and the current sampling signal of the common power supply and the standby power supply, judging the effectiveness of the common power supply and the standby power supply and judging whether the feed loops of the common power supply and the standby power supply have faults or not, and controlling the action module to act.
In an embodiment, the operation module of the low voltage switch device control apparatus is a driving circuit, and is configured to drive an energy storage capacitor in a common power source side switch or a standby power source side switch to supply power to an electromagnetic coil according to the determination result, so that the electromagnetic coil adjusts states of the common power source side switch and the standby power source side switch.
In one embodiment, the low-voltage switchgear control device, the power supply module includes: and the power supply circuit unit is used for processing the preset weak current voltage after the voltage of the common power supply voltage or the standby power supply voltage is reduced when the common power supply voltage or the standby power supply voltage is connected, and supplying power to the voltage detection module, the current detection module, the judgment module, the action module, the parameter setting module, the communication module and the display module.
In one embodiment, the low-voltage switchgear control device, the power supply module further includes: and the power supply capacitor is used for supplying power to the voltage detection module, the current detection module, the judgment module, the action module, the parameter setting module, the communication module and the display module when the common power supply and the standby power supply are powered off.
In a second aspect, an embodiment of the present invention provides a low voltage switchgear control method, including the following steps: acquiring preset reference parameters, wherein the reference parameters comprise: voltage reference parameters of a common power supply and a standby power supply, frequency reference parameters of the common power supply and the standby power supply, current reference parameters of the common power supply and the standby power supply, and time delay parameters of switching actions of the common power supply side and the standby power supply side; acquiring a real-time sampling signal, the real-time sampling signal comprising: the method comprises the steps of sampling a real-time common power supply voltage, a real-time common power supply frequency, a real-time standby power supply voltage, a real-time standby power supply frequency, a real-time common power supply current and a real-time standby power supply current; detecting the states of a common power supply side switch and a standby power supply side switch; judging the effectiveness of the common power supply according to the common power supply voltage reference parameter, the common power supply frequency reference parameter, the real-time common power supply voltage sampling signal and the real-time common power supply frequency sampling signal, and taking the effectiveness as a first judgment result; judging whether the currents of the common power supply and the standby power supply are abnormal or not according to the current reference parameters of the common power supply and the standby power supply and the current sampling signals of the real-time common power supply and the standby power supply, and taking the current sampling signals as a second judgment result; and adjusting the states of the common power supply side switch and the standby power supply side switch according to the first judgment result and the second judgment result.
In an embodiment, the step of adjusting the states of the normal power source side switch and the standby power source side switch according to the first determination result and the second determination result includes: when the first judgment result is that the common power supply fails, starting conversion delay; when the conversion delay is finished, acquiring a real-time common power supply voltage sampling signal and a real-time common power supply frequency sampling signal; judging the effectiveness of the common power supply according to the common power supply voltage reference parameter, the common power supply frequency reference parameter, the real-time common power supply voltage sampling signal and the real-time common power supply frequency sampling signal, and taking the effectiveness as a third judgment result; and when the third judgment result is that the common power supply fails, turning off the side switch of the common power supply.
In an embodiment, the step of adjusting the states of the normal power source side switch and the standby power source side switch according to the first determination result and the second determination result further includes: when the second judgment result is that the current of the common power supply or the current of the standby power supply is abnormal, a conversion forbidding instruction is generated; disconnecting the common power supply side switch; a first alarm signal is generated.
In an embodiment, the step of adjusting the states of the normal power source side switch and the standby power source side switch according to the first determination result and the second determination result further includes: judging the effectiveness of the standby power supply according to the standby power supply voltage reference parameter, the standby power supply frequency reference parameter, the real-time standby power supply voltage sampling signal and the real-time standby power supply frequency sampling signal, and taking the effectiveness as a fourth judgment result; when the fourth judgment result is that the standby power supply is effective, judging whether a conversion forbidding instruction exists or not, and generating a fifth judgment result; and when the fifth judgment result is that no conversion prohibition instruction exists, closing the switch of the standby power supply side.
In an embodiment, the step of adjusting the states of the normal power source side switch and the standby power source side switch according to the first determination result and the second determination result further includes: and generating a second alarm signal when the fourth judgment result is that the standby power supply is invalid.
In an embodiment, the step of adjusting the states of the normal power source side switch and the standby power source side switch according to the first determination result and the second determination result further includes: and generating a first alarm signal when the fifth judgment result is that the conversion prohibition instruction exists.
The technical scheme of the invention has the following advantages:
1. the low-voltage switch equipment control device and the control method thereof provided by the invention expand the existing automatic change-over switch equipment control device to detect only voltage, frequency and phase signals and detect current signals, and the low-voltage switch equipment control device adjusts the switching state of the low-voltage switch equipment according to the detected voltage, frequency, phase and current sampling signals of a real-time common power supply and a standby power supply, realizes the coordination and unification of the protection function and the dual-power switching function of a low-voltage power distribution system, and effectively prevents more serious accidents caused by the fact that a line fault still has a power supply.
2. According to the low-voltage switch equipment control device and the control method, the extra power supply capacitor is additionally arranged in the power circuit and used for providing power for the control device when a common power supply and a standby power supply are both powered off, and the energy storage capacitor in the low-voltage switch equipment is controlled to provide power for the electromagnetic coil, so that the condition that the low-voltage switch equipment does not act when a feed circuit fails can be prevented, and potential safety hazards are effectively reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a composition diagram of a specific example of a low-voltage switchgear control apparatus in an embodiment of the present invention;
fig. 2 is a composition diagram of another specific example of the low-voltage switchgear control apparatus in the embodiment of the present invention;
fig. 3 is a composition diagram of another specific example of the low-voltage switchgear control apparatus in the embodiment of the present invention;
fig. 4 is a composition diagram of another specific example of the low-voltage switchgear control apparatus in the embodiment of the present invention;
fig. 5 is a flowchart showing a specific example of the low-voltage switchgear control apparatus in the embodiment of the present invention;
fig. 6 is a flowchart showing another specific example of the low-voltage switchgear control apparatus in the embodiment of the present invention;
fig. 7 is a flowchart showing another specific example of the low-voltage switchgear control apparatus in the embodiment of the present invention;
fig. 8 is a flowchart showing another specific example of the low-voltage switchgear control apparatus in the embodiment of the present invention;
fig. 9 is a control principle flow chart of the low-voltage switchgear control method in the embodiment of the invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
An embodiment of the present invention provides an automatic transfer switching device control apparatus, which may be applied to an emergency power supply system, as shown in fig. 1, and includes: voltage detection module 1, current detection module 2, judge module 3, action module 4, parameter setting module 5 and power module 6, wherein:
and the voltage detection module 1 is used for detecting the voltage, the frequency and the phase of the common power supply and the standby power supply. In the embodiment of the invention, the voltage detection module 1 detects a common power supply voltage sampling signal, a common power supply frequency sampling signal, a common power supply phase sampling signal, a standby power supply voltage sampling signal, a standby power supply frequency sampling signal and a standby power supply phase sampling signal by using two input transformers and a voltage sampling circuit.
And the current detection module 2 is used for detecting the current of the common power supply and the standby power supply. In the embodiment of the invention, the current detection module 2 detects the currents of the common power supply and the standby power supply by using the common power supply input end current transformer, the standby power supply input end current transformer and the current sampling circuit.
And the judging module 3 is used for judging the effectiveness of the common power supply and the standby power supply and judging whether the feed loops of the common power supply and the standby power supply have faults or not. In the embodiment of the invention, the judging module 3 acquires the switch state of the common power supply side and the switch state of the standby power supply side by using the switch state detecting unit, judges the effectiveness of the common power supply and the standby power supply and whether a feed loop of the common power supply and the standby power supply has a fault or not by using the main processor according to the voltage, frequency and current reference parameters of the common power supply and the standby power supply and the voltage sampling signal, the frequency sampling signal and the current sampling signal of the common power supply and the standby power supply, and controls the action module to act.
And the action module 4 is used for adjusting the states of the common power supply side switch and the standby power supply side switch according to the judgment result of the judgment module. In the embodiment of the invention, the action module 4 is a driving circuit and controls the action of the electromagnetic coil in the automatic transfer switch device according to the judgment result of the judgment module.
The parameter setting module 5 is configured to obtain preset reference parameters, and includes: the voltage reference parameters of the common power supply and the standby power supply, the frequency reference parameters of the common power supply and the standby power supply, the current reference parameters of the common power supply and the standby power supply, and the action delay parameters of the switch at the side of the common power supply and the switch at the side of the standby power supply. In the embodiment of the invention, the parameter setting module 5 acquires preset voltage, frequency, current reference parameters and delay parameters for the main processor and provides an action threshold value basis for the control device.
And the power supply module 6 is used for providing power for the voltage detection module, the current detection module, the judgment module, the action module and the parameter setting module. In the embodiment of the present invention, the power supply module 6 includes a power supply circuit unit, which is used for rectifying and filtering the weak current voltage converted by the two input transformers into a constant direct current voltage, and providing a power supply for the low voltage switch device control apparatus.
The low-voltage switch equipment control device and the control method thereof provided by the invention expand the existing automatic change-over switch equipment control device to detect only voltage, frequency and phase signals and detect current signals, and the low-voltage switch equipment control device adjusts the switching state of the low-voltage switch equipment according to the detected voltage, frequency, phase and current sampling signals of a real-time common power supply and a standby power supply, realizes the coordination and unification of the protection function and the dual-power switching function of a low-voltage power distribution system, and effectively prevents more serious accidents caused by the fact that a line fault still has a power supply.
In a specific embodiment, as shown in fig. 2, the low voltage switchgear control apparatus further includes:
and the display module 7 is used for displaying the detected voltages of the common power supply and the standby power supply, the currents of the common power supply and the standby power supply, the reference parameters of the voltages of the common power supply and the standby power supply, the reference parameters of the currents of the common power supply and the standby power supply, the switching state of the common power supply side and the switching state of the standby power supply side.
And the communication module 8 is used for information interaction between the control device of the low-voltage switch equipment and the remote control terminal. In the embodiment of the present invention, the communication module 8 is a communication circuit, and is configured to send a control instruction of the low-voltage switchgear control device to the remote control end, where the remote control end sends the control instruction to the low-voltage switchgear, and adjusts a switching state according to the control instruction, and the low-voltage automatic transfer switchgear transmits an operation parameter and a state of the low-voltage switchgear to the control device through the remote control end, so that the control device sends a correct control instruction.
In one embodiment, as shown in fig. 3, the voltage detection module 1 includes:
and the common power supply input transformer is used for converting the common power supply voltage into a preset weak current voltage. In the embodiment of the invention, the common power voltage is converted into safe and reliable weak current voltage after being isolated and reduced by the common power input transformer.
And the standby power supply input transformer is used for converting the standby power supply voltage into a preset weak current voltage. In the embodiment of the invention, the standby power supply voltage is converted into safe and reliable weak current voltage after being isolated and reduced by the standby power supply input transformer.
And the voltage sampling circuit unit is used for acquiring voltage, frequency and phase sampling signals of the common power supply and the standby power supply. In the embodiment of the invention, the common power supply voltage and the standby power supply voltage are converted into weak current voltage through two paths of input transformers, and the weak current voltage is isolated and filtered through the voltage sampling circuit to provide voltage, frequency and phase sampling signals for the main processor.
In one embodiment, as shown in fig. 3, the current detection module 2 includes:
and the current transformer at the input end of the common power supply is used for converting the common power supply current into a current signal which can be sampled by the current sampling circuit unit. In the embodiment of the invention, the current transformer at the input end of the common power supply converts larger current of the common power supply into a current signal which can be received by the control device.
And the standby power supply input end current transformer is used for converting standby power supply current into a current signal which can be sampled by the current sampling circuit unit. In the embodiment of the invention, the current transformer at the input end of the standby power supply converts larger common power supply current into a current signal which can be received by the control device.
And the current sampling circuit unit is used for acquiring current sampling signals of the current of the common power supply and the standby power supply. In the embodiment of the invention, in order to facilitate the main processor to process the load current, the current sampling circuit modulates and filters the current signal acceptable by the control device to obtain the current sampling signals of the common power supply and the standby power supply.
In an embodiment, as shown in fig. 3, the determining module 3 includes:
and the switch state detection unit is used for acquiring the switch state of the common power supply side and the switch state of the standby power supply side. In the embodiment of the invention, the switch state detection unit is a switch position detection circuit and mainly converts the positions of a common power switch and a standby power switch in low-voltage switch equipment into electric signals and transmits the electric signals to the main processor.
And the main processor is used for generating a judgment result according to the reference parameters, the voltage sampling signal, the frequency sampling signal and the current sampling signal of the common power supply and the standby power supply, judging the effectiveness of the common power supply and the standby power supply and judging whether the feed loops of the common power supply and the standby power supply have faults or not, and controlling the action module to act. In the embodiment of the invention, an analog-to-digital converter of a main processor converts a voltage sampling signal, a frequency sampling signal and a current sampling signal into digital quantity, and real-time voltage value, frequency, phase and current value are obtained after the operation of the main processor, so that real-time voltage, frequency, phase and current detection basis is provided for a control device; an I/O port of the main processor acquires a common power supply side switching state and a standby power supply side switching state provided by the switching state detection circuit in real time, and provides a switching state basis for the control device; the main processor compares the real-time detected voltage value, frequency, phase and current value with the threshold value obtained by the parameter setting module, judges the effectiveness of the common power supply and the standby power supply and whether the feed circuit has faults or not, and sends a correct control instruction to the action module to adjust the switching state of the low-voltage switch equipment. The main processor can also perform information interaction with the remote control end through the communication module to complete the transmission of the operating parameters and the state of the low-voltage switch equipment, the remote operation conversion of the remote control end on the low-voltage switch equipment and the like.
In an embodiment, as shown in fig. 3, the action module 4 is a driving circuit, configured to drive an energy storage capacitor in the common power source side switch or the standby power source side switch to supply power to the electromagnetic coil according to the determination result, so that the electromagnetic coil adjusts a state of the common power source side switch or the standby power source side switch. As shown in fig. 4, in the embodiment of the present invention, the driving circuit drives the energy storage capacitor in the low-voltage switching device to discharge to the electromagnetic coil according to the control command sent by the determining module, so as to control the electromagnetic coil to operate.
In an embodiment, as shown in fig. 3, the power supply module 6 includes a power circuit unit, and is configured to process a preset weak current voltage obtained by reducing the voltage of the common power supply or the standby power supply when the common power supply or the standby power supply is connected, so as to provide power for the voltage detection module, the current detection module, the determination module, the action module, the parameter setting module, the communication module, and the display module. Because the weak current voltage of the common power supply and the weak current voltage of the standby power supply are alternating current, in the embodiment of the invention, the power supply circuit rectifies the weak current voltage of the common power supply and the weak current voltage of the standby power supply into direct current voltage, and provides power for each module in the control device after filtering and voltage stabilization.
In an embodiment, as shown in fig. 3, the power supply module 6 further includes a power supply capacitor for providing power to the voltage detection module, the current detection module, the judgment module, the action module, the parameter setting module, the communication module and the display module when the power supply of the common power supply and the standby power supply is cut off. In the embodiment of the present invention, as shown in fig. 4, when the common power source or the standby power source is active, each module in the control device is powered by the common power source or the standby power source, but when the common power source or the standby power source is inactive, an additional power supply capacitor is required to supply power to the control device in order to avoid the inactivity of the low voltage switch device.
The low-voltage switch equipment control device and the control method thereof provided by the invention expand the existing automatic change-over switch equipment control device to detect only voltage, frequency and phase signals and detect current signals, and the low-voltage switch equipment control device adjusts the switching state of the low-voltage switch equipment according to the detected voltage, frequency, phase and current sampling signals of a real-time common power supply and a standby power supply, realizes the coordination and unification of the protection function and the dual-power switching function of a low-voltage power distribution system, and effectively prevents more serious accidents caused by the fact that a line fault still has a power supply. In addition, the control device and the control method of the low-voltage switch equipment provided by the invention have the advantages that the extra power supply capacitor is additionally arranged in the power circuit and is used for providing power for the control device when a common power supply and a standby power supply are both powered off, and the energy storage capacitor in the low-voltage switch equipment is controlled to provide power for the electromagnetic coil, so that the condition that the low-voltage switch equipment does not act when a feed circuit fails can be prevented, and the potential safety hazard is effectively reduced.
Example 2
An embodiment of the present invention provides a method for controlling an automatic transfer switch device, as shown in fig. 5, including the following steps:
step S1: acquiring preset reference parameters, wherein the reference parameters comprise: the system comprises a common power supply and standby power supply voltage reference parameter, a common power supply and standby power supply frequency reference parameter, a common power supply and standby power supply current reference parameter and a switch action delay parameter of a common power supply side and a standby power supply side.
In the embodiment of the invention, the low-voltage switch equipment control device compares the real-time sampling signal with the reference parameter so as to judge the effectiveness of the common power supply and the standby power supply. Therefore, a preset reference parameter needs to be obtained, and in the embodiment of the present invention, in addition to switching between dual power supplies, short circuit protection, overload protection, ground fault protection, and open-phase protection can be implemented, so the reference parameter number includes: the voltage reference parameters of the common power supply and the standby power supply, the frequency reference parameters of the common power supply and the standby power supply, the current reference parameters of the common power supply and the standby power supply, and the action delay parameters of the switch at the side of the common power supply and the switch at the side of the standby power supply.
Step S2: acquiring a real-time sampling signal, the real-time sampling signal comprising: the system comprises a real-time common power supply voltage sampling signal, a real-time common power supply frequency sampling signal, a real-time standby power supply voltage sampling signal, a real-time standby power supply frequency sampling signal, a real-time common power supply current sampling signal and a real-time standby power supply current sampling signal.
In the embodiment of the present invention, the low-voltage switch device control apparatus compares the real-time sampling signal with the reference parameter to further determine the effectiveness of the common power supply and the standby power supply, so that the real-time sampling signal needs to be obtained, and in addition to switching between the dual power supplies, the present invention can also implement short-circuit protection, overload protection, ground fault protection, and open-phase protection, so that the real-time sampling signal includes: the real-time voltage of the common power supply and the standby power supply, the real-time frequency of the common power supply and the standby power supply, and the real-time current of the common power supply and the standby power supply.
Step S3: the states of the normal power source side switch and the standby power source side switch are detected.
In the embodiment of the invention, the positions of a common power supply side switch and a standby power supply side switch in the low-voltage switch equipment are mainly converted into electric signals to be transmitted to the main processor, so that the judgment module can send out an accurate control instruction.
Step S4: and judging the effectiveness of the common power supply according to the common power supply voltage reference parameter, the common power supply frequency reference parameter, the real-time common power supply voltage sampling signal and the real-time common power supply frequency sampling signal, and taking the effectiveness as a first judgment result.
In the embodiment of the invention, when the dual power supplies are switched, the low-voltage switch equipment control device needs to compare the voltage and the frequency reference parameters of the common power supply and the standby power supply with the real-time voltage and frequency of the common power supply and the standby power supply, judge the effectiveness of the voltage of the common power supply and the voltage of the standby power supply, and send out a control instruction according to the judgment result.
Step S5: and judging whether the currents of the common power supply and the standby power supply are abnormal according to the current reference parameters of the common power supply and the standby power supply and the current sampling signals of the real-time common power supply and the standby power supply, and taking the current sampling signals as a second judgment result.
In the embodiment of the invention, in order to prevent the breaker of the protective element in the power distribution system from breaking the power supply loop when short circuit, overload, ground fault, phase failure and other faults occur, so that the control device of the low-voltage switch equipment detects that the common power supply is cut off and drives the standby power supply switch to be closed, and the device is burnt to cause larger damage. Therefore, in order to detect whether the feed circuit has a fault, the embodiment of the invention judges whether the feed circuit has the fault according to the current reference parameters of the common power supply and the standby power supply and the current sampling signals of the real-time common power supply and the standby power supply.
Step S6: and adjusting the states of the common power supply side switch and the standby power supply side switch according to the first judgment result and the second judgment result.
In the embodiment of the invention, in order to realize the switching of the double power supplies and prevent the load from having the faults of short circuit, overload, ground fault and open phase, the effectiveness of the common power supply and the standby power supply and whether the current of the common power supply and the current of the standby power supply are abnormal need to be comprehensively considered.
In a specific embodiment, as shown in fig. 6, the process of executing step S6 may specifically include the following steps:
step S611: and when the first judgment result is that the common power supply fails, starting conversion delay.
In order to prevent the malfunction of the dual-power automatic transfer switch caused by the voltage sag of the common power supply, in the embodiment of the invention, when the main processor judges that the common power supply fails, the transfer is started for delaying.
Step S612: and after the conversion delay is finished, acquiring a real-time common power supply voltage sampling signal and a real-time common power supply frequency sampling signal.
In the embodiment of the invention, after the conversion delay is finished, whether the common power supply still fails needs to be confirmed again, so that the real-time voltage and the real-time frequency of the common power supply are obtained.
Step S613: and judging the effectiveness of the common power supply according to the common power supply voltage reference parameter, the common power supply frequency reference parameter, the real-time common power supply voltage sampling signal and the real-time common power supply frequency sampling signal, and taking the effectiveness as a third judgment result.
In the embodiment of the invention, in order to complete the switching from the power supply of the common power supply to the power supply of the standby power supply of the low-voltage switch equipment, the main processor needs to judge whether the common power supply still fails or not again.
Step S614: and when the third judgment result is that the common power supply fails, turning off the side switch of the common power supply.
In the embodiment of the invention, when the main processor judges that the common power supply fails, the load needs to be supplied by the standby power supply, so that the low-voltage switch equipment needs to be controlled to disconnect the common power supply switch.
In a specific embodiment, as shown in fig. 7, the process of executing step S6 may specifically include the following steps:
step S621: and when the second judgment result is that the current of the common power supply or the current of the standby power supply is abnormal, generating a conversion forbidding instruction.
When the load has short circuit, overload, grounding and open-phase faults, the low-voltage switch equipment in the embodiment of the invention generates a conversion forbidding instruction when judging that the current of the common power supply or the current of the standby power supply is abnormal, and prevents the switching between the double power supplies, thereby providing power for a fault loop and causing more harm.
Step S622: the common power side switch is turned off.
In the embodiment of the invention, the initial state of the low-voltage switch device is that the switch on the side of the common power supply is closed and the switch on the side of the standby power supply is opened, so that when the control device judges that the current of the common power supply or the current of the standby power supply is abnormal, the power supply of the feed circuit needs to be cut off in time, namely the switch on the side of the common power supply is cut off.
Step S623: a first alarm signal is generated.
In the embodiment of the invention, when the low-voltage switch equipment control device judges that the current of the common power supply or the current of the standby power supply is abnormal, a first alarm signal is generated to inform a worker to maintain, and in the embodiment of the invention, two alarm signals are set so that the worker can distinguish the fault types and the maintenance is convenient.
In a specific embodiment, as shown in fig. 8, the process of executing step S6 may specifically include the following steps:
step S631: and judging the effectiveness of the standby power supply according to the standby power supply voltage reference parameter, the standby power supply frequency reference parameter, the real-time standby power supply voltage sampling signal and the real-time standby power supply frequency sampling signal, and taking the effectiveness as a fourth judgment result.
In the embodiment of the invention, in the process of switching the double power supplies, after the common power supply is disconnected in order to prevent the double power supply from failure, the effectiveness of the standby power supply needs to be judged according to the standby power supply voltage reference parameter, the standby power supply frequency reference parameter, the real-time standby power supply voltage sampling signal and the real-time standby power supply frequency sampling signal.
Step S632: and when the fourth judgment result is that the standby power supply is effective, judging whether a conversion forbidding instruction exists or not, and generating a fifth judgment result.
In the embodiment of the invention, the common power supply is disconnected possibly because the feed circuit has a fault or the common power supply fails, when the current of the common power supply or the current of the standby power supply is abnormal, namely the feed circuit has a fault, the control device can generate the switching forbidding instruction to forbid the switching from the power supply of the common power supply to the power supply of the standby power supply, and when the common power supply fails and the feed circuit has no fault, the control device can not generate the switching forbidding instruction, so that the dual power supply switching can be carried out at the moment.
Step S633: and when the fifth judgment result is that no conversion prohibition instruction exists, closing the switch of the standby power supply side.
In the embodiment of the invention, when the common power supply fails and the switching prohibition instruction is not provided, the dual power supply switching is carried out, and the switch of the side of the standby power supply can be closed at the moment.
In a specific embodiment, the process of performing step S6 may include the following:
and generating a second alarm signal when the fourth judgment result is that the standby power supply is invalid.
In order to timely handle hidden trouble and ensure normal operation of equipment, in the embodiment of the invention, when a common power switch and a standby power switch are both disconnected due to an external fault or an automatic transfer switching equipment fault, namely when the common power supply fails, the standby power supply fails and no fault occurs in a feed circuit, an alarm signal is sent out in time to inform a worker of timely maintenance.
In a specific embodiment, the process of performing step S6 may include the following:
and generating a first alarm signal when the fifth judgment result is that the conversion prohibition instruction exists.
When the load has short circuit, overload, grounding and open-phase faults, in the embodiment of the invention, the low-voltage switch equipment control device drives the electromagnetic coil to act to disconnect the common power supply, generates a conversion forbidding command and sends out a first alarm signal to inform a worker to maintain.
In the embodiment of the invention, the low-voltage switch equipment control device controls the electromagnetic coil to act to adjust the switch state by judging whether the common power supply and the standby power supply fail and whether the currents of the common power supply and the standby power supply are abnormal, and a specific control principle flow chart is shown in fig. 9.
Firstly, acquiring a voltage reference parameter, a frequency reference parameter, a current reference parameter and a delay parameter which are considered to be preset; then, detecting the voltage, frequency, phase and current of the double power supplies at the same time; then, judging whether the current of the common power supply and the standby power supply is abnormal or not, and judging whether the voltage and the frequency of the common power supply are normal or not; then, the steps after the current of the common power supply and the standby power supply is abnormal are as follows: if the current of the common power supply or the standby power supply is abnormal, a conversion forbidding instruction is generated, a side switch of the common power supply is disconnected, and a first accident alarm is generated; if the currents of the common power supply and the standby power supply are normal, the currents of the common power supply and the standby power supply are continuously detected; then, the steps after judging whether the voltage and the frequency of the common power supply are normal are as follows: firstly, if the voltage and the frequency of the common power supply are abnormal, the side switch of the common power supply is disconnected, and if the voltage and the frequency of the common power supply are normal, the voltage, the frequency and the phase of the common power supply and the standby power supply are continuously detected; then, if the voltage and the frequency of the common power supply are abnormal, after a switch at the side of the common power supply is disconnected, judging whether the voltage and the frequency of the standby power supply are normal or not, if the voltage and the frequency of the standby power supply are abnormal, generating a second accident warning signal, and if the voltage and the frequency of the standby power supply are normal, continuously judging whether a conversion forbidding instruction exists or not; then, if the voltage and the frequency of the standby power supply are normal and the switching prohibition instruction is not provided, the switch of the standby power supply is closed, and if the voltage and the frequency of the standby power supply are normal and the switching prohibition instruction is provided, a first alarm signal is generated.
The low-voltage switch equipment control device and the control method thereof provided by the invention expand the existing automatic change-over switch equipment control device to detect only voltage, frequency and phase signals and detect current signals, and the low-voltage switch equipment control device adjusts the switching state of the low-voltage switch equipment according to the detected voltage, frequency, phase and current sampling signals of a real-time common power supply and a standby power supply, realizes the coordination and unification of the protection function and the dual-power switching function of a low-voltage power distribution system, and effectively prevents more serious accidents caused by the fact that a line fault still has a power supply. In addition, the control device and the control method of the low-voltage switch equipment provided by the invention have the advantages that the extra power supply capacitor is additionally arranged in the power circuit and is used for providing power for the control device when a common power supply and a standby power supply are both powered off, and the energy storage capacitor in the low-voltage switch equipment is controlled to provide power for the electromagnetic coil, so that the condition that the low-voltage switch equipment does not act when a feed circuit fails can be prevented, and the potential safety hazard is effectively reduced.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (11)
1. A control device for a low-voltage switchgear, characterized in that it comprises:
the voltage detection module is used for detecting the voltage, the frequency and the phase of the common power supply and the standby power supply;
the current detection module is used for detecting the current of the common power supply and the standby power supply;
the judging module is used for judging the effectiveness of the common power supply and the standby power supply and judging whether the feed loops of the common power supply and the standby power supply have faults or not;
the action module is used for adjusting the states of the common power supply side switch and the standby power supply side switch according to the judgment result of the judgment module;
the parameter setting module is used for acquiring preset reference parameters and comprises: voltage reference parameters of a common power supply and a standby power supply, frequency reference parameters of the common power supply and the standby power supply, current reference parameters of the common power supply and the standby power supply, and action delay parameters of a switch at the side of the common power supply and a switch at the side of the standby power supply;
and the power supply module is used for providing power for the voltage detection module, the current detection module, the judgment module, the action module and the parameter setting module.
2. The control device of a low-voltage switchgear apparatus according to claim 1, characterized in that it further comprises:
the display module is used for displaying the detected voltages of the common power supply and the standby power supply, the currents of the common power supply and the standby power supply, the reference parameters of the voltages of the common power supply and the standby power supply, the reference parameters of the currents of the common power supply and the standby power supply, the switching state of the common power supply side and the switching state of the standby power supply side;
and the communication module is used for information interaction between the control device of the low-voltage switch equipment and the remote control terminal.
3. The control device of a low-voltage switchgear apparatus according to claim 1, characterized in that said voltage detection module comprises: a common power input transformer, a standby power input transformer and a voltage sampling circuit unit; wherein,
the common power supply input transformer is used for converting common power supply voltage into preset weak current voltage;
the standby power supply input transformer is used for converting the standby power supply voltage into a preset weak current voltage;
and the voltage sampling circuit unit is used for acquiring voltage, frequency and phase sampling signals of the common power supply and the standby power supply.
4. The control device of a low-voltage switchgear apparatus according to claim 3, characterized in that said current detection module comprises: a current transformer at the input end of a common power supply, a current transformer at the input end of a standby power supply and a current sampling circuit unit; wherein,
the current transformer at the input end of the common power supply is used for converting the current of the common power supply into a current signal which can be sampled by the current sampling circuit unit;
the standby power supply input end current transformer is used for converting standby power supply current into a current signal which can be sampled by the current sampling circuit unit;
and the current sampling circuit unit is used for acquiring current sampling signals of the current of the common power supply and the standby power supply.
5. The control device of the low-voltage switchgear apparatus according to claim 4, wherein the judging module comprises: a switch state detection unit and a main processor; wherein,
the switching state detection unit is used for acquiring the switching state of the common power supply side and the switching state of the standby power supply side;
and the main processor is used for generating a judgment result according to the reference parameters, the voltage sampling signal, the frequency sampling signal and the current sampling signal of the common power supply and the standby power supply, judging the effectiveness of the common power supply and the standby power supply and judging whether the feed loops of the common power supply and the standby power supply have faults or not, and controlling the action module to act.
6. The control device of a low-voltage switch apparatus as claimed in claim 5, wherein the operation module is a driving circuit, and is configured to drive an energy storage capacitor in a common power source side switch or a backup power source side switch to supply power to the solenoid according to the determination result, so that the solenoid adjusts states of the common power source side switch and the backup power source side switch.
7. Control device of a low-voltage switchgear apparatus according to claim 2, characterized in that said power supply module comprises: and the power supply circuit unit is used for processing the preset weak current voltage after the voltage of the common power supply voltage or the standby power supply voltage is reduced when the common power supply voltage or the standby power supply voltage is connected, and supplying power to the voltage detection module, the current detection module, the judgment module, the action module, the parameter setting module, the communication module and the display module.
8. The control device of a low-voltage switchgear apparatus according to claim 7, characterized in that said power supply module further comprises: and the power supply capacitor is used for supplying power to the voltage detection module, the current detection module, the judgment module, the action module, the parameter setting module, the communication module and the display module when the common power supply and the standby power supply are powered off.
9. A method of controlling a low voltage switchgear comprising the steps of:
acquiring preset reference parameters, wherein the reference parameters comprise: voltage reference parameters of a common power supply and a standby power supply, frequency reference parameters of the common power supply and the standby power supply, current reference parameters of the common power supply and the standby power supply, and time delay parameters of switching actions of the common power supply side and the standby power supply side;
acquiring a real-time sampling signal, the real-time sampling signal comprising: the method comprises the steps of sampling a real-time common power supply voltage, a real-time common power supply frequency, a real-time standby power supply voltage, a real-time standby power supply frequency, a real-time common power supply current and a real-time standby power supply current;
detecting the states of a common power supply side switch and a standby power supply side switch;
judging the effectiveness of the common power supply according to the common power supply voltage reference parameter, the common power supply frequency reference parameter, the real-time common power supply voltage sampling signal and the real-time common power supply frequency sampling signal, and taking the effectiveness as a first judgment result;
judging whether the currents of the common power supply and the standby power supply are abnormal or not according to the current reference parameters of the common power supply and the standby power supply and the current sampling signals of the real-time common power supply and the standby power supply, and taking the current sampling signals as a second judgment result;
adjusting the states of the common power supply side switch and the standby power supply side switch according to the first judgment result and the second judgment result, including: when the first judgment result is that the common power supply fails, starting conversion delay; when the conversion delay is finished, acquiring a real-time common power supply voltage sampling signal and a real-time common power supply frequency sampling signal; judging the effectiveness of the common power supply according to the common power supply voltage reference parameter, the common power supply frequency reference parameter, the real-time common power supply voltage sampling signal and the real-time common power supply frequency sampling signal, and taking the effectiveness as a third judgment result; when the third judgment result is that the common power supply fails, turning off a switch at the side of the common power supply;
when the second judgment result is that the current of the common power supply or the current of the standby power supply is abnormal, a conversion forbidding instruction is generated; disconnecting the common power supply side switch; generating a first alarm signal;
judging the effectiveness of the standby power supply according to the standby power supply voltage reference parameter, the standby power supply frequency reference parameter, the real-time standby power supply voltage sampling signal and the real-time standby power supply frequency sampling signal, and taking the effectiveness as a fourth judgment result; when the fourth judgment result is that the standby power supply is effective, judging whether a conversion forbidding instruction exists or not, and generating a fifth judgment result; and when the fifth judgment result is that no conversion prohibition instruction exists, closing the switch of the standby power supply side.
10. The method of claim 9, wherein the step of adjusting the states of the normal power source side switch and the standby power source side switch according to the first determination result and the second determination result further comprises:
and generating a second alarm signal when the fourth judgment result is that the standby power supply is invalid.
11. The method of claim 10, wherein the step of adjusting the states of the normal power source side switch and the standby power source side switch according to the first determination result and the second determination result further comprises:
and generating a first alarm signal when the fifth judgment result is that the conversion prohibition instruction exists.
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