CN106300398B - Interphase load transfer terminal device based on steady-state waveform fitting - Google Patents
Interphase load transfer terminal device based on steady-state waveform fitting Download PDFInfo
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- CN106300398B CN106300398B CN201610907863.6A CN201610907863A CN106300398B CN 106300398 B CN106300398 B CN 106300398B CN 201610907863 A CN201610907863 A CN 201610907863A CN 106300398 B CN106300398 B CN 106300398B
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention provides an interphase load transfer terminal device based on steady-state waveform fitting, which comprises an alternating current main circuit module, a sampling module, an instruction operation module, a main control module and a communication interface module, wherein the main control module is respectively connected with the communication interface module, the sampling module and the instruction operation module, and the sampling module and the instruction operation module are also connected with the alternating current main circuit module. The interphase load transfer terminal device based on the steady-state waveform fitting, provided by the embodiment of the invention, can quickly realize interphase load transfer in the phase-changing operation process, and avoid power failure of a user; the instantaneous current of the break point and the closing point in the phase change operation tends to zero, so that the generation of large impact current is avoided, and the impact on the phase change device body and electric equipment is reduced. The purpose is through the three-phase unbalanced load of automatic adjustment distribution transformer and low voltage circuit, reduces the power consumption, less low-voltage problem, solves distribution transformer single-phase overload problem.
Description
Technical Field
The invention relates to the technical field of low-voltage power distribution and energy conservation, in particular to an interphase load transfer terminal device based on steady-state waveform fitting.
Background
The existing low-voltage line generally comprises three-phase lines of A phase, B phase and C phase and a zero line, if the load of the three-phase circuit is unbalanced, the electric energy loss of a distribution transformer and the low-voltage line is increased, and a low-voltage problem can be caused, and even a single-phase winding of the transformer is burnt.
Currently, methods for automatically adjusting three-phase load imbalance include a power supply side interphase capacitance bridging method, a dynamic reactive power compensation method, a load side load transfer method and the like. The principle of the inter-phase bridging capacitor method is that capacitors are bridged on a low-voltage bus, and the three-phase current of a low-voltage outlet of a distribution transformer is basically balanced by the aid of the current which is distributed from a phase with a heavy load to a phase with a light load. The method has the advantages that the adjusting device is simple and convenient to install, and the defects that the unbalance of the three-phase current of the distribution transformer can be adjusted only and the unbalance of the three-phase current of the low-voltage line can not be adjusted. The dynamic powerless compensation method is a new method developed in recent years, the principle of the dynamic powerless compensation method is similar to that of an interphase bridging capacitor method, and the dynamic powerless compensation method has the advantages of adjusting both current imbalance and voltage imbalance. The method has the advantages of complete functions, fine adjustment and high response speed, and has the defects of capability of only adjusting the unbalance of the three-phase current of the distribution transformer and incapability of adjusting the unbalance of the three-phase current of a low-voltage line, high power consumption of the device and high cost.
The principle of the load side load transfer method is that a plurality of automatic phase-changing terminals installed on a single-phase user branch line are adopted to automatically transfer part of the load of a user from a phase with a heavier load to a phase with a lighter load, so that basic balance of three-phase current of an outlet of a distribution transformer and the line is realized.
The current commonly used interphase load transfer method adopts a zero-crossing phase selection method, namely, in an ABC three-phase circuit, when the current waveform of the current phase with a heavier load crosses zero, the phase is disconnected, and when the waveform of the target phase voltage with a lighter load crosses zero, the phase is closed. The method has the problems that after the circuit is disconnected, induced electromotive force exists in a load side circuit, when target phase voltage crosses zero, the voltage of a closing point is not zero, and at the moment of closing the circuit, a relatively large current can be generated, so that relatively large impact is generated on electric equipment or electric appliances, or operation overvoltage is generated, the normal use of the electric equipment is influenced, or the quality of electric energy is reduced.
Disclosure of Invention
The embodiment of the invention aims to provide an interphase load transfer terminal device based on steady-state waveform fitting, which can quickly realize interphase load transfer in the phase change operation process and avoid power failure of a user; the instantaneous current of the break point and the closing point in the phase change operation tends to zero, so that the generation of large impact current is avoided, the stable transfer of the interphase load is realized, and the impact on the phase change device body and electric equipment is reduced. The purpose is through the three-phase unbalanced load of automatic adjustment distribution transformer and low voltage circuit, reduces the power consumption, less low-voltage problem, solves distribution transformer single-phase overload problem.
In order to achieve the above object, the present invention provides an interphase load transfer terminal device based on steady-state waveform fitting, the terminal device includes an ac main circuit module, a sampling module, an instruction operation module, a main control module and a communication interface module, the main control module is respectively connected to the communication interface module, the sampling module and the instruction operation module are further connected to the ac main circuit module, wherein: the alternating current main circuit module comprises a power supply side circuit, a switching circuit and a load side circuit, wherein the power supply side circuit comprises an A-phase circuit, a B-phase circuit and a C-phase circuit which are connected in parallel, the switching circuit comprises magnetic latching relays corresponding to the phase circuits, and the load side circuit comprises a current transformer, a voltage transformer and a load side output terminal; the A-phase circuit, the B-phase circuit and the C-phase circuit have the same structure and respectively comprise an input terminal and a voltage transformer; the communication interface module is used for receiving a commutation instruction switched from a current phase circuit to a target phase circuit and sending the commutation instruction to the main control module; the sampling module is used for collecting current signals of a current transformer in the load side circuit and collecting voltage signals of a voltage transformer in the current phase circuit; the main control module comprises a timer and a timer control unit for controlling the timer to be started or closed, wherein the timer is used for responding to a control instruction of the timer control unit, recording the change time of a current signal of a current transformer in the load side circuit and recording the change time of a voltage signal of a voltage transformer in the current phase circuit; the instruction operation module is used for transmitting the breaking instruction or the closing instruction issued by the main control module to each magnetic latching relay.
Furthermore, the A-phase circuit, the B-phase circuit and the C-phase circuit further comprise fuses or air switches.
Furthermore, the terminal device further comprises a power module, a data storage module and a display keyboard circuit module, wherein the power module is used for supplying power to each module in the terminal device, and the display keyboard circuit module and the data storage module are connected with the main control module.
Further, the main control module further comprises a logic matching unit for matching the time recorded by the timer with a preset time.
Furthermore, the main control module further comprises a correction unit for correcting the breaking time or the closing time of the magnetic latching relay.
According to the technical scheme provided by the embodiment of the invention, the embodiment of the invention can determine the zero-crossing time point of the current signal by detecting the current signal of the current transformer in the load side circuit. The zero-crossing time point of the current signal is used as the breaking point of the current phase, so that the instant current at the breaking point of the line tends to zero, and larger current cannot be generated at the breaking point. In addition, after the circuit is disconnected, the voltage signal of the voltage transformer in the target phase and the induced electromotive force signal of the voltage transformer in the load side circuit are detected, so that the time point when the voltage in the target phase circuit is equal to the voltage of the induced electromotive force on the load side can be determined, the instant current at the closing point of the target phase circuit can be ensured to be zero by determining the time point as the closing time point of the target phase, larger current cannot be generated at the closing point, and the electric equipment can be protected.
Further, the induced electromotive force generated at the load side gradually decays to 0 with the lapse of time. In the first period of the induced electromotive force generation, the waveform of the electromotive force is approximately consistent with the voltage waveform in the current phase circuit (namely, the attenuation value of the electromotive force along with the time is ignored), and the current phase voltage waveform can be approximately used for replacing the load side induced electromotive force waveform. In order to simplify the control circuit, a point in time at which the electrical voltage of the target phase is equal to the voltage of the current phase may be determined, which is determined as the closing point in time of the target phase.
Drawings
Fig. 1 is a graph of voltage waveforms after an ac circuit is disconnected in an embodiment of the present invention;
FIG. 2 is a waveform diagram illustrating a phase change process from phase A to phase B according to an embodiment of the present invention;
FIG. 3 is a waveform diagram illustrating a phase change process from phase A to phase C according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an inter-phase load transfer terminal device based on steady-state waveform fitting according to an embodiment of the present invention;
fig. 5 is a circuit diagram of an ac main circuit module according to an embodiment of the invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of the present invention.
The invention provides an interphase load transfer terminal device based on steady-state waveform fitting. Referring to fig. 4 and 5, the terminal device includes an ac main circuit module 1, a sampling module 3, an instruction operation module 4, a main control module 6, and a communication interface module 8, where the main control module 6 is connected to the communication interface module 8, the sampling module 3, and the instruction operation module 4, respectively, and the sampling module 3 and the instruction operation module 4 are further connected to the ac main circuit module 1.
In the present embodiment, the ac main circuit module 1 includes a power supply side circuit including an a-phase circuit, a B-phase circuit, and a C-phase circuit connected in parallel, a switching circuit including magnetic latching relays 14, 18, and 112 corresponding to the respective phase circuits, and a load side circuit including a current transformer 113, a voltage transformer 114, and a load side output terminal 115, and the a-phase circuit, the B-phase circuit, and the C-phase circuit have the same structure and each include an input terminal 11, 15, and 19 and a voltage transformer 13, 17, and 111.
Please refer to fig. 1. In the present embodiment, the voltage signals in each phase circuit, i.e., the steady-state waveforms, are all sinusoidal waveforms. The phases of the voltage signals in the three-phase circuit are 120 ° apart. At the same time, only one phase circuit is in a closed state, and the other two phase circuits are in an open state. Assume that the current a-phase circuit is in a closed state, and the B-phase and C-phase circuits are in an open state. Then when the a-phase circuit is disconnected at a certain time, an induced electromotive force, i.e., a transient waveform, is generated on the load side, and the dotted line in fig. 1 is the waveform of the induced electromotive force. As seen from fig. 1, the induced electromotive force generated on the load side after the a-phase circuit is disconnected gradually decays to 0 with the lapse of time. In the present embodiment, in the first period in which the induced electromotive force is generated, the waveform thereof approximately coincides with the voltage waveform in the a-phase circuit (that is, the attenuation value thereof with time is ignored), and the load-side induced electromotive force waveform may be approximately replaced with the a-phase voltage waveform. Thus, after the a-phase circuit is disconnected, a normal voltage waveform that lasts for one cycle is also applied to the load side.
Referring to fig. 2, the zero-crossing points of the current signal 200 of the a-phase circuit are T0 and T2, and the zero-crossing points of the voltage signal 100 of the a-phase circuit are T1. As can be seen from fig. 2, at time T1, when the voltage signal 100 crosses zero, the current signal 200 is not zero. Therefore, if the a-phase circuit is disconnected at time T1, the disconnection point still has a large current, which may cause damage to the load-side electric equipment. In this embodiment, the a-phase circuit is disconnected at time T2, i.e., when the current signal 200 crosses zero, and the instantaneous current at the disconnection point approaches zero. And at this time, an induced electromotive force as shown by a dotted line in fig. 2 is also generated in the load side circuit. In order that the voltage of the power source side circuit and the induced electromotive voltage of the load side circuit can be the same at the closing point of the B-phase circuit, the B-phase circuit is closed at a time T3 shown in fig. 2, that is, when the voltage waveform of the induced electromotive voltage intersects with the voltage waveform 300 input from the B-phase circuit. Thus, when the B-phase circuit is closed, the voltage on the power supply side is equal to the voltage on the load side, and the instantaneous current at the closing point tends to zero. In order to simplify the control circuit, a time point at which the voltage of the B phase is equal to the voltage of the a phase may be determined as a closing time point of the B phase. After the phase B circuit is closed, phase B current 500 may be generated in the circuit.
Similarly, referring to fig. 3, after the a-phase circuit is disconnected, at time T4, that is, when the voltage waveform of the induced electromotive force on the load side intersects the voltage waveform 400 input to the C-phase circuit, the C-phase circuit is closed, so that the instantaneous current at the closing point tends to zero. In order to simplify the control circuit, a time point at which the voltage of the C phase is equal to the voltage of the a phase may be determined, and the time point may be determined as a closing time point of the target phase. After the C-phase circuit is closed, C-phase current 600 may be generated in the circuit.
Please refer to fig. 4 and 5 together. In this embodiment, the communication interface module 8 is configured to receive a phase change instruction for switching from a current phase circuit to a target phase circuit, and send the phase change instruction to the main control module 6. For convenience of description, it is assumed that the current phase is phase a and the target phase is phase B. In this way, the main control module 6 collects the current signal of the current transformer 113 in the load side circuit and the voltage signal of the voltage transformer 13 in the current phase circuit through the sampling module.
In this embodiment, the main control module 6 includes a timer and a timer control unit for controlling the timer to be turned on or off, and the timer is configured to record a change time of a current signal of a current transformer in the load side circuit and record a change time of a voltage signal of a voltage transformer in the current phase circuit in response to a control instruction of the timer control unit. Specifically, when detecting that the current waveform 200 shown in fig. 2 changes from positive to 0, i.e., at point T0, the main control module 6 starts the breaking timer program in the timer control unit. When detecting that the voltage waveform 100 in fig. 2 changes from negative to 0, i.e., at point T1, the main control module 6 starts a closing timer program in the timer control unit. Thus, the timer counts the breaking process and the closing process, respectively, wherein the starting point for counting the breaking process is T0, and the starting point for counting the closing process is T1.
In this embodiment, the frequency of the voltage signal and the current signal in the line are both 50Hz, and the time span of the half cycle of the voltage signal and the current signal is 10 milliseconds. Thus, when the dividing time recorded in the timer is equal to 10-Tr, the main control module 6 divides the main contact S of the magnetic latching relay 14 corresponding to the a-phase circuit in advance by instructing the operation module 4. Wherein, Tr is the breaking/closing time of the magnetic latching relay, and the typical value is 5 milliseconds, that is, after the magnetic latching relay is given a breaking or closing instruction, the main contact S will break or close the line after 5 milliseconds. Thus, after 5 milliseconds, the main control module 6 sends an opening command to the magnetic latching relay 14 through the command operation module 4 from T0, so as to open the a-phase circuit at point T2 in fig. 2.
In this embodiment, the timer in the main control module 6 starts to count the B-phase circuit closing process from time T1. Since the phase difference between the voltage signal of the a-phase circuit and the voltage signal of the B-phase circuit is 120 °, the angular difference between the time T3 and the time T1 in fig. 2 is calculated to be 150 °, and the time difference between T1 and T3 is (150/360) × 20 — 8.33 msec. Thus, when the counted time for the closing process in the timer is equal to 8.33-Tr, the main control module 6 instructs the operation module 4 to close the main contact S of the magnetic latching relay 18 corresponding to the B-phase circuit in advance, so that the main control module 6 issues an opening instruction to the magnetic latching relay 18 through the instruction operation module 4 after 3.33 milliseconds from T1, thereby closing the B-phase circuit at point T3 in fig. 2.
In the present embodiment, the phase change process from the a-phase circuit to the C-phase circuit is also similar to the above process except that the time counted by the timer is different in the process of closing the C-phase circuit. Referring to fig. 3, when the breaking time recorded in the timer is equal to 10-Tr, the main control module 6 instructs the operation module 4 to break the main contact S of the magnetic latching relay 14 corresponding to the a-phase circuit in advance. Wherein, Tr is the breaking/closing time of the magnetic latching relay, and the typical value is 5 milliseconds, that is, after the magnetic latching relay is given a breaking or closing instruction, the main contact S will break or close the line after 5 milliseconds. Thus, after 5 milliseconds, the main control module 6 sends an opening command to the magnetic latching relay 14 through the command operation module 4 from T0, so as to open the a-phase circuit at point T2 in fig. 2.
In this embodiment, the timer in the main control module 6 starts to count the C-phase circuit closing process from time T1. Since the phase difference between the voltage signal of the a-phase circuit and the voltage signal of the C-phase circuit is 210 °, the angle difference between the time T4 and the time T1 in fig. 3 is calculated to be 210 °, and the time difference between T1 and T4 is (210/360) × 20 ═ 11.67 msec. Thus, when the counted time for the closing process in the timer is equal to 11.67-Tr, the main control module 6 closes the main contact S of the magnetic latching relay 112 corresponding to the C-phase circuit in advance by instructing the operation module 4. Thus, after 6.67 milliseconds from T1, the main control module 6 issues an open command to the magnetic latching relay 112 through the command operation module 4, thereby closing the C-phase circuit at point T4 in fig. 3.
As can be seen from the above, the instruction operation module 4 is configured to transmit a breaking instruction or a closing instruction issued by the main control module 6 to each magnetic latching relay.
In one embodiment of the present invention, the a-phase circuit, the B-phase circuit and the C-phase circuit further include fuses 12, 16 and 110, the fuses limit the maximum current in each phase circuit, and when the current in the circuit exceeds the maximum limit value, the fuses are blown, so as to protect the electronic devices in the circuit from being damaged. The fuse may also be replaced with an air switch.
In an embodiment of the present invention, the terminal device further includes a power module 2, a data storage module 5, and a display keyboard circuit module 7, where the power module 2 is configured to supply power to each module in the terminal device, and the display keyboard circuit module 7 and the data storage module 5 are both connected to the main control module 6. The display keyboard circuit module 7 is used as an interaction module between the main control module 6 and the outside, a user issues various instructions to the main control module 6 through the display keyboard circuit module 7, and the main control module 6 displays various parameters of the current device to the user through the display keyboard circuit module 7. The data storage module 5 stores data generated during data processing of the terminal device.
In an embodiment of the present invention, the main control module 6 further includes a logic matching unit for matching the time recorded by the timer with a preset time. The logic matching unit sets different preset time aiming at different phase circuits. For example, when the phase of the a-phase circuit is changed to the phase of the B-phase circuit, the logic matching unit sets the preset time to 5 milliseconds for the breaking process, so that once the breaking time recorded by the timer reaches 5 milliseconds, the main control module 6 issues a breaking instruction to the magnetic latching relay 14 through the instruction operation module 4, thereby breaking the a-phase circuit at point T2 in fig. 2. In addition, the preset time set in the logical matching unit is, for example, 3.33 msec and 6.67 msec.
In an embodiment of the present invention, the main control module 6 further includes a correction unit for correcting the open time or the close time of the magnetic latching relay. Specifically, as shown in fig. 2, the correction unit controls the timer to record the actual time ts from T0 until the current becomes zero. Since the theoretical time difference between the point T2 and the point T0 is 10 milliseconds, the correction time Toff becomes 10-ts during the breaking process. Then, from the point T0, the time point at which the magnetic latching relay 14 corresponding to the a-phase circuit performs the opening operation is 10-Tr + Toff. And calculating the breaking correction time of the B-phase magnetic latching relay and the C-phase magnetic latching relay by using the same method.
Likewise, for the closing correction time from the a-phase to the B-phase, as shown in fig. 2, the correction unit controls the timer to record the time ts1 from the start of T1 until the current signal in the load-side current transformer rises from zero. Since the theoretical time difference between the point T3 and the point T1 is 8.33 milliseconds, the closing correction time Ton of the magnetic latching relay corresponding to the B-phase circuit becomes 8.33-ts 1. Then the point in time at which the magnetic latching relay corresponding to the B-phase circuit performs the closing operation is 8.33-Tr + Ton from the point T1. The closing correction times of "phase B to phase C" and "phase C to phase a" were calculated by the same method.
The closing correction time from phase a to phase C is also calculated in a similar manner to that described above for phase a to phase B. Referring to fig. 3, the correction unit controls the timer to record the time ts2 from T1 to the time when the current signal in the load-side current transformer rises from zero. Since the theoretical time difference between the point T4 and the point T1 is 11.67 milliseconds, the closing correction time of the magnetic latching relay corresponding to the C-phase circuit is Ton1, which is 11.67-ts 2. Then the point in time at which the magnetic latching relay corresponding to the C-phase circuit performs the closing operation is 11.67-Tr + Ton from the point T1. The closing correction times of "phase C to phase B" and "phase B to phase a" were calculated by the same method.
According to the technical scheme provided by the embodiment of the invention, the embodiment of the invention detects the current signal of the current transformer in the load side circuit, so that the time point of the zero crossing of the current signal is determined. The time point of the zero crossing of the current signal is used as a breaking point of the current phase, so that large current cannot be generated at the breaking point after the line is broken. In addition, after the circuit is disconnected, the current phase voltage is detected, so that the time point when the voltage of the target phase is equal to the current phase voltage is determined, and the current tends to zero at the moment when the circuit of the target phase is closed by determining the time point as the closing time point of the target phase.
The foregoing description of various embodiments of the invention is provided to those skilled in the art for the purpose of illustration. Various alternatives and modifications of the invention will be apparent to those skilled in the art to which the invention pertains. Thus, while some alternative embodiments have been discussed in detail, other embodiments will be apparent or relatively easy to derive by those of ordinary skill in the art. The present invention is intended to embrace all such alternatives, modifications, and variances which have been discussed herein, and other embodiments which fall within the spirit and scope of the above application.
Claims (5)
1. The utility model provides an interphase load transfer terminal device based on steady state waveform fitting, terminal device includes exchanges main circuit module, sampling module, instruction operation module, host system and communication interface module, its characterized in that, host system respectively with communication interface module, sampling module, instruction operation module link to each other, sampling module with instruction operation module still with exchange the main circuit module and link to each other, wherein:
the alternating current main circuit module comprises a power supply side circuit, a switching circuit and a load side circuit, wherein the power supply side circuit comprises an A-phase circuit, a B-phase circuit and a C-phase circuit which are connected in parallel, the switching circuit comprises magnetic latching relays corresponding to the phase circuits, and the load side circuit comprises a current transformer, a voltage transformer and a load side output terminal; the A-phase circuit, the B-phase circuit and the C-phase circuit have the same structure and respectively comprise an input terminal and a voltage transformer;
the communication interface module is used for receiving a commutation instruction switched from a current phase circuit to a target phase circuit and sending the commutation instruction to the main control module;
the sampling module is used for collecting current signals of a current transformer in the load side circuit and collecting voltage signals of a voltage transformer in the current phase circuit;
the main control module comprises a timer and a timer control unit for controlling the timer to be started or closed, wherein the timer is used for responding to a control instruction of the timer control unit, recording the change time of a current signal of a current transformer in the load side circuit and recording the change time of a voltage signal of a voltage transformer in the current phase circuit so as to determine the time point of zero crossing of a first current signal and determine the time point of equal voltage of voltage in a target phase circuit and induced electromotive force of the load side; the time point of the zero crossing of the first current signal is used as a breaking point of the current phase, and the time point of the voltage in the target phase circuit which is equal to the voltage of the induced electromotive force on the load side is determined to be used as a closing time point of the target phase;
the instruction operation module is used for transmitting the breaking instruction or the closing instruction issued by the main control module to each magnetic latching relay.
2. The terminal device according to claim 1, wherein the a-phase circuit, the B-phase circuit, and the C-phase circuit further comprise a fuse or an air switch.
3. The terminal device according to claim 1, further comprising a power module, a data storage module and a display keyboard circuit module, wherein the power module is configured to supply power to each module in the terminal device, and the display keyboard circuit module and the data storage module are both connected to the main control module.
4. The terminal apparatus according to claim 1, wherein the main control module further comprises a logic matching unit for matching the time recorded by the timer with a preset time.
5. The terminal device according to claim 1, wherein the main control module further comprises a correction unit for correcting an opening time or a closing time of the magnetic latching relay.
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| CN201610907863.6A CN106300398B (en) | 2016-10-18 | 2016-10-18 | Interphase load transfer terminal device based on steady-state waveform fitting |
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| CN201610907863.6A CN106300398B (en) | 2016-10-18 | 2016-10-18 | Interphase load transfer terminal device based on steady-state waveform fitting |
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| CN108933444A (en) * | 2017-05-22 | 2018-12-04 | 菏泽峥艳电力科技有限公司 | Intelligent phase-change switch control circuit |
| CN107086593A (en) * | 2017-06-05 | 2017-08-22 | 泰豪科技股份有限公司 | A kind of breaker for possessing alternate load forwarding function |
| CN107069781A (en) * | 2017-06-05 | 2017-08-18 | 泰豪科技股份有限公司 | A kind of air switch for possessing alternate load forwarding function |
| CN108306315B (en) * | 2018-01-19 | 2019-09-24 | 中南大学 | A kind of low-voltage network phase change method and commutation equipment and terminal |
| CN111970886B (en) * | 2020-08-06 | 2022-05-17 | 贵州振华群英电器有限公司（国营第八九一厂） | Analog deputy device for double-redundancy transient pulse input |
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