CN113595227A - Low-voltage transformer area load uninterrupted switching system and working method thereof - Google Patents
Low-voltage transformer area load uninterrupted switching system and working method thereof Download PDFInfo
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- CN113595227A CN113595227A CN202110821338.3A CN202110821338A CN113595227A CN 113595227 A CN113595227 A CN 113595227A CN 202110821338 A CN202110821338 A CN 202110821338A CN 113595227 A CN113595227 A CN 113595227A
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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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- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/42—Synchronising a generator for connection to a network or to another generator with automatic parallel connection when synchronisation is achieved
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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
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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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
- 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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- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
The invention discloses a low-voltage transformer area load uninterrupted switching system and a working method thereof, and relates to the technical field of electric power operation, maintenance and power supply. At present, power failure switching is needed during power grid maintenance. The invention comprises a main conducting branch, a short-time conducting branch, a mains supply bypass, a control circuit and a current/voltage signal acquisition module; the main conductive branch comprises a second circuit breaker Q2; one end of a second breaker Q2 is connected with the mobile box transformer/power supply vehicle S1, and the other end of the second breaker Q2 is connected with the outlet end of the low-voltage distribution box JP 1; the short-time conducting branch comprises an electronic solid-state switch D1; the short-time conducting branch is connected with a second breaker Q2 in parallel; the mains bypass comprises a first circuit breaker Q1; one end of the first breaker Q1 is connected with a low-voltage distribution box JP1 wire outlet end, and the other end of the first breaker Q1 is connected with a low-voltage distribution box JP1 wire inlet end; in the technical scheme, the solid-state electronic solid-state switch D1 undertakes a transient process, and solves the short-time power failure phenomenon caused by the breaking of a mechanical contact, so that the uninterrupted switching of the load between a power grid and a standby power supply is realized.
Description
Technical Field
The invention relates to the technical field of power operation, maintenance and power supply, in particular to a low-voltage transformer area load uninterrupted switching system and a working method thereof.
Background
For operations such as user access, defect handling, equipment scheduled inspection, maintenance, accident handling, higher-level power grid maintenance and the like, the low-voltage distribution network often uses a method of first power cut and then power down, so that the power cut times are more, the time is longer, the normal production of enterprises is seriously influenced, and much inconvenience is brought to the life of people. The power supply enterprise reduces the electricity selling amount due to power failure, so economic loss is caused, complaint responsibility caused by frequent power failure of users in the jurisdiction is born, the social image of the power supply enterprise is damaged, and the social influence caused by power failure is highly valued by the power supply enterprise.
At present, a scheme for realizing the back-off between commercial power and a generator is applied in a 0.4kV low-voltage system by synchronization detection and switching after grid connection, but the defects are described as follows: firstly, the scheme requires the grid-connected operation of the generator and the power grid, has large impact on the generator and the power grid, can affect the stability of the system, and even has the risk and fault of grid-connected failure. Secondly, in order to simplify the grid-connected operation steps, the bypass power supply operation needs to be performed on the grid side, the live-line operation needs to be performed on the grid side outlet end, the live-line operation needs to be performed on the grid side inlet end, and the live-line operation steps and the safety risks are increased. In addition, the standby power supply modes in various places are also obviously different, for example, the standby power supply adopts a mobile box transformer, and at this time, because the wiring modes of the transformer are different and the two power supplies are different between full load and no load, the two power supplies on the low-voltage side have the same frequency but have a larger angle difference, and at this time, the grid connection requirement cannot be met, the load switching cannot be realized by synchronous grid connection, and therefore, the use requirements of all users cannot be met.
In order to solve the problem that the existing quasi-synchronization grid connection is safe and is not limited from the technical innovation point, the steps of live working are further simplified, the application scene of uninterrupted working is increased, and the reliability and the safety of uninterrupted switching are improved, a novel uninterrupted switching scheme is urgently needed, so that uninterrupted smooth transition of loads is realized.
Disclosure of Invention
The technical problem to be solved and the technical task provided by the invention are to perfect and improve the prior technical scheme, and provide a low-voltage transformer area load uninterrupted switching system and a working method thereof, so as to realize uninterrupted switching of the load between a power grid and a standby power supply and achieve the purposes of simple network side live access and high switching speed. Therefore, the invention adopts the following technical scheme.
A low-voltage transformer area load uninterrupted switching system comprises a main power conducting branch, a short-time power conducting branch, a mains supply bypass, a control circuit and a current/voltage signal acquisition module;
the main conductive branch comprises a second circuit breaker Q2; one end of a second breaker Q2 is connected with a mobile box transformer/power supply vehicle S1; the other end of the second breaker Q2 is connected with a low-voltage distribution box JP1 outlet end;
the short-time conducting branch comprises an electronic solid-state switch D1; the short-time conducting branch is connected with a second breaker Q2 in parallel;
the mains supply bypass comprises a first circuit breaker Q1; one end of a first breaker Q1 is connected with a low-voltage distribution box JP1 outlet end; the other end of the first breaker Q1 is connected with the inlet wire end of a low-voltage distribution box JP 1;
the control circuit comprises a main control unit MC1, wherein the main control unit MC1 is connected with a current/voltage signal acquisition module to acquire voltage and current information; the main control unit MC1 controls the on-off of the main conductive branch circuit through a second circuit breaker Q2; the master control unit MC1 controls the on-off of the short-time conducting branch through the electronic solid-state switch D1; the main control unit MC1 controls the on-off of the main conducting branch through a first circuit breaker Q1;
when the load needs to be transferred to the mobile box transformer substation/power supply vehicle S1 from the mains supply side, the main control unit MC1 judges whether the voltage value of the mobile box transformer substation/power supply vehicle S1 and the mains supply is within an error range and whether the phase sequence is consistent through a current/voltage signal acquisition module, and if the conditions are met, the mobile box transformer substation/power supply vehicle enters a waiting switching stage;
when the main control unit MC1 instantly detects the voltage drop of the outlet end of the low-voltage distribution box JP1 through the current/voltage signal acquisition module, the main control unit MC1 controls and conducts the electronic solid-state switch D1, and the load supplies power to the load through the mobile box transformer/power supply vehicle S1 and the short-time conductive branch, so that the load is guaranteed to supply power uninterruptedly;
meanwhile, the master control unit MC1 controls a second circuit breaker Q2 to close, so that the main conducting branch is conducted; when the main control unit MC1 detects that the main conductive branch has current through the current/voltage signal acquisition module, the main control unit MC1 controls the short-time conductive branch to be disconnected through the electronic solid-state switch D1, at the moment, the load supplies power to the load through the mobile box transformer/power supply vehicle S1 and the main conductive branch, and at the moment, the high-voltage side of the commercial power is allowed to perform power failure maintenance operation;
when the high-voltage side of the commercial power is in a power failure state, allowing the commercial power bypass to be connected with the inlet wire end of the low-voltage distribution box JP 1;
after the high-voltage side is overhauled, the main control unit MC1 obtains the voltage of the incoming line of the low-voltage distribution box JP1 through a current/voltage signal acquisition module, whether the voltage values of the incoming line end and the outgoing line end of the low-voltage distribution box JP1 are within an error range and whether the phase sequences are consistent or not is judged, if the conditions are met, the main control unit MC1 drives an electronic solid-state switch D1 to be conducted, a short-time conducting branch is conducted, and meanwhile, a second circuit breaker Q2 is driven to be switched off, so that a main conducting branch is disconnected; at the moment, the load is supplied with power in a short time through a mobile box transformer/power supply vehicle S1 and a short-time conductive branch;
the main control unit MC1 controls the first breaker Q1 to switch on to conduct the mains supply bypass, when the main control unit MC1 detects that current appears on the mains supply bypass through the current/voltage signal acquisition module, the main control unit MC1 cuts off the short-time conducting branch through the electronic solid-state switch D1, and at the moment, the mains supply supplies power to the load through the mains supply bypass;
after a low-voltage distribution box JP1 general incoming line switch is manually switched on, the main control unit MC1 controls the first circuit breaker Q1 to be switched off, so that a mains supply bypass is disconnected, and the operation of returning the load from a mobile box transformer substation/power supply vehicle S1 to mains supply is completed in a non-power-cut mode.
The technical scheme is realized by adopting non-grid-connected rapid switching, and a voltage sudden change rapid detection technology, a hybrid switch switching technology and an excitation switch closing rapid detection technology are applied to a conversion system; in the switching process, the solid-state electronic solid-state switch D1 undertakes a transient process, and solves the short-time power failure phenomenon caused by the breaking of a mechanical contact, so that the uninterrupted switching of the load between a power grid and a standby power supply is realized, and the device has the remarkable advantages of simple electrified access of the grid side, high switching speed, high synchronization performance, low static loss, good comprehensive performance and the like.
The electronic solid-state switch D1 is driven to be instantly conducted, so that the short-time power failure phenomenon caused by the action delay of the mechanical contact is compensated, and the uninterrupted switching control of the load is realized.
Voltage signal acquisition provides the main control unit MC1 with in-phase sequence detection and low-voltage distribution box JP1 main switch opening time detection; the collection of the current signal not only provides effective value calculation for overload and short circuit protection, but also provides three-phase instantaneous current modulus value calculation as the switching-on and switching-off feedback information of the first breaker Q1 and the second breaker Q2 and as the instantaneous on-off trigger signal of the electronic solid-state switch D1.
The first and second circuit breakers Q1 and Q2 not only complete the switching on/off and power switching on operation of the main power supply, but also have the overload short-circuit protection function.
As a preferable technical means: the short-time conducting branch circuit also comprises a third breaker Q3, and the third breaker Q3 is connected with an electronic solid-state switch D1 in series. The third circuit breaker Q3 is mainly used for overload and short-circuit protection caused by the failure of the electronic solid-state switch D1, and the fault accident is prevented from being expanded.
As a preferable technical means: the current/voltage signal acquisition module comprises a first current sensor CT1 for acquiring the current information of a mains supply bypass, a second current sensor CT2 for acquiring the current information of a main conducting branch, a first voltage sensor PT1 for acquiring the voltage information of a mains supply, a second voltage sensor PT2 for acquiring the voltage information of a mobile power supply vehicle S1 and a third voltage sensor PT3 for acquiring the voltage information of a wire outlet end; the first current sensor CT1, the second current sensor CT2, the first voltage sensor PT1, the second voltage sensor PT2 and the third voltage sensor PT3 are connected with the main control unit MC 1.
As a preferable technical means: the three sensors are respectively provided with three A \ B \ C three phases, wherein the three phases are respectively corresponding to the first current sensor CT1, the second current sensor CT2, the first voltage sensor PT1, the second voltage sensor PT2 and the third voltage sensor PT 3.
As a preferable technical means: the first current sensor CT1 is arranged on a commercial power bypass, and the first current sensor CT1 is positioned between the first breaker Q1 and the outlet end of the press-fit box JP 1;
the second current sensor CT2 is arranged on the main conductive branch, and the second current sensor CT2 is positioned between the second circuit breaker Q2 and the outlet end of the press-fit box JP 1;
the first voltage sensor PT1 is arranged on a mains supply bypass, and the first voltage sensor PT1 is positioned between the first breaker Q1 and the inlet wire end of the press-fit box JP 1;
the second voltage sensor PT2 is arranged on the main conductive branch, and the second voltage sensor PT2 is positioned between the second circuit breaker Q2 and the mobile power supply vehicle S1;
the third voltage sensor PT3 is arranged on the main conducting branch or the commercial power bypass, the third voltage sensor PT3 is positioned between the second circuit breaker Q2 and the outlet end of the low-voltage distribution box JP1, or the third voltage sensor PT3 is positioned between the first circuit breaker Q1 and the outlet end of the low-voltage distribution box JP 1.
The invention also aims to provide a working method of the uninterrupted switching system for the loads of the low-voltage transformer area.
A working method of a low-voltage transformer area load uninterrupted switching system comprises the following steps:
1) when the load needs to be transferred to the mobile box type transformer/power supply vehicle S1 from the mains supply side, the main control unit MC1 acquires the voltage value of each phase of the corresponding mobile box type transformer/power supply vehicle S1 and the voltage value of each phase of the mains supply through the second voltage sensor PT2 and the third voltage sensor PT3, judges whether the voltage values of the mobile box type transformer/power supply vehicle S1 and the mains supply are within an error range and whether the phase sequences are consistent, and if the conditions are met, enters a waiting switching stage;
2) at the moment, when the master control unit MC1 detects the instantaneous voltage drop of the outlet end of the low-voltage distribution box JP1 through the third voltage sensor PT3, the master control unit MC1 controls the electronic solid-state switch D1 to be switched on, and the load supplies power to the load through the mobile box transformer/power supply vehicle S1 and the short-time conductive branch, so that the load is guaranteed to supply power uninterruptedly;
3) the master control unit MC1 controls the second circuit breaker Q2 to close, so that the main conductive branch is conducted; when the main control unit MC1 detects that the main conductive branch has current through the second current sensor CT2, the main control unit MC1 controls the short-time conductive branch to be disconnected through the electronic solid-state switch D1, at the moment, the load supplies power to the load through the mobile box transformer/power supply vehicle S1 and the main conductive branch, and at the moment, the power failure maintenance operation is allowed to be carried out on the high-voltage side of the commercial power;
4) when the high-voltage side of the commercial power is in a power failure state, allowing the commercial power bypass to be connected with the inlet wire end of the low-voltage distribution box JP 1;
5) after the high-voltage side is overhauled, the main control unit MC1 correspondingly monitors the voltage of the incoming line end of the low-voltage distribution box JP1 and the voltage of the outgoing line end of the low-voltage distribution box JP1 through a first voltage sensor PT1 and a third voltage sensor PT3, judges whether the voltage values of the incoming line end and the outgoing line end of the low-voltage distribution box JP1 are in an error range and whether the phase sequence is consistent, and if the conditions are met, the main control unit MC1 drives an electronic solid switch D1 to be conducted to enable a short-time conductive branch to be conducted and simultaneously drives a second circuit breaker Q2 to be switched off to enable a main conductive branch to be disconnected; at the moment, the load is supplied with power in a short time through a mobile box transformer/power supply vehicle S1 and a short-time conductive branch;
6) the main control unit MC1 controls a first breaker Q1 to switch on to conduct a mains supply bypass, when the main control unit MC1 detects that current appears on the mains supply bypass through a first current sensor CT1, the main control unit MC1 cuts off a short-time conducting branch through an electronic solid-state switch D1, and at the moment, the mains supply supplies power to a load through the mains supply bypass;
7) after a low-voltage distribution box JP1 general incoming line switch is manually switched on, the main control unit MC1 controls the first circuit breaker Q1 to be switched off, so that a mains supply bypass is disconnected, and the operation of returning the load from a mobile box transformer substation/power supply vehicle S1 to mains supply is completed in a non-power-cut mode.
As a preferable technical means: the short-time conducting branch is provided with a third circuit breaker Q3, the third circuit breaker Q3 is connected with an electronic solid-state switch D1 in series, and when the short-time conducting branch is switched on, the load supplies power to the load through a mobile box transformer/power supply vehicle S1, the third circuit breaker Q3 and the electronic solid-state switch D1.
Has the advantages that:
the technical scheme solves the problem that safety exists in the existing quasi-synchronization grid connection, further simplifies the steps of live working, increases the application scenes of uninterrupted working, and improves the reliability and safety of uninterrupted switching.
In the switching process, the solid-state electronic solid-state switch D1 undertakes a transient process, and solves the short-time power failure phenomenon caused by the breaking of a mechanical contact, so that the uninterrupted switching of the load between a power grid and a standby power supply is realized, and the device has the remarkable advantages of simple electrified access of the grid side, high switching speed, high synchronization performance, low static loss, good comprehensive performance and the like.
Drawings
Fig. 1 is an electrical schematic diagram of the low-voltage load uninterrupted fast switching system.
Fig. 2 is a schematic diagram of short-time power supply of the utility power supply vehicle S1 by the Q3 and D1 at the moment of the commercial power outage.
Fig. 3 is a schematic diagram of the load power supply circuit after the second circuit breaker Q2 is closed.
Fig. 4 is a schematic diagram of the bypass power supply of the utility power through the first circuit breaker Q1.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the drawings in the specification.
As shown in fig. 1, the invention mainly includes a main conducting branch, a short-time conducting branch, a mains supply bypass, a control circuit and a current/voltage signal acquisition module;
wherein: the main conductive branch comprises a second circuit breaker Q2; one end of a second breaker Q2 is connected with a mobile box transformer/power supply vehicle S1; the other end of the second breaker Q2 is connected with a low-voltage distribution box JP1 outlet end;
the short-time conducting branch comprises an electronic solid-state switch D1 and a first breaker Q1; the short-time conducting branch is connected with a second breaker Q2 in parallel;
the mains supply bypass comprises a first circuit breaker Q1; one end of a first breaker Q1 is connected with a low-voltage distribution box JP1 outlet end; the other end of the first breaker Q1 is used for being connected with a low-voltage distribution box JP1 incoming line end; initially, the inlet end of the first disconnector Q1 is temporarily disconnected from the inlet end of the external low-voltage switchgear JP1, as indicated by the dashed line segment in fig. 1;
the control circuit comprises a main control unit MC1, wherein the main control unit MC1 is connected with a current/voltage signal acquisition module to acquire voltage and current information; the main control unit MC1 controls the on-off of the main conductive branch circuit through a second circuit breaker Q2; the master control unit MC1 controls the on-off of the short-time conducting branch through the electronic solid-state switch D1; the main control unit MC1 controls the on-off of the main conducting branch through a first circuit breaker Q1;
the current/voltage signal acquisition module comprises a first current sensor CT1 for acquiring the current information of a mains supply bypass, a second current sensor CT2 for acquiring the current information of a main conducting branch, a first voltage sensor PT1 for acquiring the voltage information of a mains supply, a second voltage sensor PT2 for acquiring the voltage information of a mobile power supply vehicle S1 and a third voltage sensor PT3 for acquiring the voltage information of a wire outlet end; the first current sensor CT1, the second current sensor CT2, the first voltage sensor PT1, the second voltage sensor PT2 and the third voltage sensor PT3 are connected with the main control unit MC 1; the three first current sensors CT1, the three second current sensors CT2, the three first voltage sensors PT1, the three second voltage sensors PT2 and the three third voltage sensors PT3 are respectively provided with corresponding A \ B \ C three phases; the first current sensor CT1 is arranged on a commercial power bypass, and the first current sensor CT1 is positioned between the first breaker Q1 and the outlet end of the press-fit box JP 1;
the second current sensor CT2 is arranged on the main conductive branch, and the second current sensor CT2 is positioned between the second circuit breaker Q2 and the outlet end of the press-fit box JP 1;
the first voltage sensor PT1 is arranged on a mains supply bypass, and the first voltage sensor PT1 is positioned between the first breaker Q1 and the inlet wire end of the press-fit box JP 1;
the second voltage sensor PT2 is arranged on the main conductive branch, and the second voltage sensor PT2 is positioned between the second circuit breaker Q2 and the mobile power supply vehicle S1;
the third voltage sensor PT3 is arranged on the main conductive branch or the commercial power bypass, the third voltage sensor PT3 is positioned between the second circuit breaker Q2 and the outlet end of the low-voltage distribution box JP1, or the third voltage sensor PT3 is positioned between the first circuit breaker Q1 and the outlet end of the low-voltage distribution box JP1
As shown in fig. 1, the excitation control circuit 1 and the excitation control circuit 2 of the master control unit MC1 respectively control the switching coils Coil1 and Coil2 of the first circuit breaker Q1 and the second circuit breaker Q2, and the driving circuit of the electronic solid-state switch D1 is used for driving the conduction and the disconnection of the electronic solid-state switch D1; in addition, a first voltage sensor PT1 × 3, a second voltage sensor PT2 × 3 and a third voltage sensor PT3 × 3 on the main control unit MC1 are respectively used for measuring three-phase voltage, frequency and phase of the commercial power, the mobile power supply vehicle S1 and the load end; the first current sensor CT1 × 3 and the second current sensor CT2 × 3 measure a power supply current signal and the on/off state of the first breaker Q1 and the second breaker Q2 through the connection with the master control unit MC 1.
The working process is as follows:
and S1, when the load needs to be transferred to the mobile box transformer/power supply vehicle S1 from the mains supply side, the main control unit MC1 firstly monitors voltage signals through the second voltage sensor PT2 × 3 and the third voltage sensor PT3 × 3, judges whether the voltage values of the mobile box transformer/power supply vehicle S1 and the mains supply are within an error range and whether the phase sequence is consistent, and enters a phase of waiting for switching if the conditions are met.
S2, at the moment, a main switch of a manual brake-separating low-voltage distribution box JP1 is adopted, a main control unit MC1 instantly detects voltage drop of a voltage outlet end of the low-voltage distribution box JP1 through voltage sampling of a third voltage sensor PT3 x 3, at the moment, a loop is driven through an electronic solid-state switch D1 of a main control unit MC1 to drive the electronic solid-state switch D1 to be conducted, and a load supplies power to the load through a movable box transformer/power supply vehicle S1, a third circuit breaker Q3 and the electronic solid-state switch D1 to guarantee that the load supplies power uninterruptedly, as shown in FIG. 2.
S3, the master control unit MC1 drives the switching-closing Coil2 to act through the excitation control loop 2 at the same time, waiting for the second breaker Q2 to act and close, when the master control unit MC1 detects current flowing through the current sensor second current sensor CT2 x 3, the second breaker Q2 is successfully closed, the electronic solid-state switch D1 allows the master control unit MC1 to be disconnected, and the load supplies power to the load through the mobile box type transformer/power supply vehicle S1 and the second breaker Q2, so that the non-power-stop switching of the load from the mains supply to the mobile box type transformer/power supply vehicle S1 is completed, and as shown in FIG. 3, the high-voltage side is allowed to carry out power-cut maintenance operation.
And S4, after the high-voltage side of the low-voltage load uninterrupted switching system is powered off, allowing the incoming line side of the first breaker Q1 to pass through a cable and be connected with the incoming line end of the low-voltage distribution box under the uncharged condition.
S5, after the high-voltage side is overhauled, the main control unit MC1 monitors voltage signals through a first voltage sensor PT1 × 3 and a third voltage sensor PT3 × 3, judges whether the voltage values of the end of the low-voltage distribution box JP1 are in an error range and whether the phase sequence is consistent, if the conditions are met, the main control unit MC1 drives an electronic solid switch D1 to be conducted, and simultaneously drives a switching Coil2 and a second breaker Q2 to be opened, when the main control unit MC1 detects that the current is zero through a second current sensor CT2 × 3 of a current sensor, the second breaker Q2 is opened successfully, and at the moment, the load is powered by a mobile box transformer/power supply vehicle S1, the third breaker Q3 and the electronic solid switch D1 in a short time, as shown in FIG. 2.
S6, allowing the master control unit MC1 to drive the switching Coil1 through the excitation control loop 1 at the moment, waiting for the first breaker Q1 to operate and switch on, when the master control unit MC1 detects current flowing through the current sensor first current sensor CT1 x 3, indicating that the first breaker Q1 is successfully switched on, at the moment, switching off the electronic solid-state switch D1 through the master control unit MC1, and at the moment, supplying power to the load through the first breaker Q1 by-pass circuit at the moment, as shown in FIG. 4.
And S7, manually closing a low-voltage distribution box JP1 main incoming line switch, and finally driving and controlling a switching Coil1 and a first breaker Q1 through a main control unit MC1 to complete the operation of returning the load from a mobile box transformer/power supply vehicle S1 to the mains supply in a non-power-cut mode.
The uninterrupted switching system for low-voltage transformer area loads and the working method thereof shown in fig. 1-4 are embodiments of the present invention, which already embody the substantial features and progress of the present invention, and can be modified equivalently in shape, structure and the like according to the practical use requirements and under the teaching of the present invention, and are within the scope of protection of the present invention.
Claims (7)
1. The utility model provides a low pressure platform district load switched systems that does not have a power failure which characterized in that: the short-time power supply comprises a main conducting branch, a short-time conducting branch, a mains supply bypass, a control circuit and a current/voltage signal acquisition module;
the main conductive branch comprises a second circuit breaker Q2; one end of a second breaker Q2 is connected with a mobile box transformer/power supply vehicle S1; the other end of the second breaker Q2 is connected with a low-voltage distribution box JP1 outlet end;
the short-time conducting branch comprises an electronic solid-state switch D1; the short-time conducting branch is connected with a second breaker Q2 in parallel;
the mains supply bypass comprises a first circuit breaker Q1; one end of a first breaker Q1 is connected with a low-voltage distribution box JP1 outlet end; the other end of the first breaker Q1 is connected with the inlet wire end of a low-voltage distribution box JP 1;
the control circuit comprises a main control unit MC1, wherein the main control unit MC1 is connected with a current/voltage signal acquisition module to acquire voltage and current information; the main control unit MC1 controls the on-off of the main conductive branch circuit through a second circuit breaker Q2; the master control unit MC1 controls the on-off of the short-time conducting branch through the electronic solid-state switch D1; the main control unit MC1 controls the on-off of the main conducting branch through a first circuit breaker Q1;
when the load needs to be transferred to the mobile box transformer substation/power supply vehicle S1 from the mains supply side, the main control unit MC1 judges whether the voltage value of the mobile box transformer substation/power supply vehicle S1 and the mains supply is within an error range and whether the phase sequence is consistent through a current/voltage signal acquisition module, and if the conditions are met, the mobile box transformer substation/power supply vehicle enters a waiting switching stage;
when the main control unit MC1 instantly detects the voltage drop of the outlet end of the low-voltage distribution box JP1 through the current/voltage signal acquisition module, the main control unit MC1 controls and conducts the electronic solid-state switch D1, and the load supplies power to the load through the mobile box transformer/power supply vehicle S1 and the short-time conductive branch, so that the load is guaranteed to supply power uninterruptedly;
meanwhile, the master control unit MC1 controls a second circuit breaker Q2 to close, so that the main conducting branch is conducted; when the main control unit MC1 detects that the main conductive branch has current through the current/voltage signal acquisition module, the main control unit MC1 controls the short-time conductive branch to be disconnected through the electronic solid-state switch D1, at the moment, the load supplies power to the load through the mobile box transformer/power supply vehicle S1 and the main conductive branch, and at the moment, the high-voltage side of the commercial power is allowed to perform power failure maintenance operation;
when the high-voltage side of the commercial power is in a power failure state, allowing the commercial power bypass to be connected with the inlet wire end of the low-voltage distribution box JP 1;
after the high-voltage side is overhauled, the main control unit MC1 obtains the voltage of the incoming line of the low-voltage distribution box JP1 through a current/voltage signal acquisition module, whether the voltage values of the incoming line end and the outgoing line end of the low-voltage distribution box JP1 are within an error range and whether the phase sequences are consistent or not is judged, if the conditions are met, the main control unit MC1 drives an electronic solid-state switch D1 to be conducted, a short-time conducting branch is conducted, and meanwhile, a second circuit breaker Q2 is driven to be switched off, so that a main conducting branch is disconnected; at the moment, the load is supplied with power in a short time through a mobile box transformer/power supply vehicle S1 and a short-time conductive branch;
the main control unit MC1 controls the first breaker Q1 to switch on to conduct the mains supply bypass, when the main control unit MC1 detects that current appears on the mains supply bypass through the current/voltage signal acquisition module, the main control unit MC1 cuts off the short-time conducting branch through the electronic solid-state switch D1, and at the moment, the mains supply supplies power to the load through the mains supply bypass;
after a low-voltage distribution box JP1 general incoming line switch is manually switched on, the main control unit MC1 controls the first circuit breaker Q1 to be switched off, so that a mains supply bypass is disconnected, and the operation of returning the load from a mobile box transformer substation/power supply vehicle S1 to mains supply is completed in a non-power-cut mode.
2. The uninterrupted switching system of low-voltage transformer area loads as claimed in claim 1, wherein: the short-time conducting branch circuit also comprises a third breaker Q3, and the third breaker Q3 is connected with an electronic solid-state switch D1 in series.
3. The uninterrupted switching system of low-voltage transformer area loads as claimed in claim 2, wherein: the current/voltage signal acquisition module comprises a first current sensor CT1 for acquiring the current information of a mains supply bypass, a second current sensor CT2 for acquiring the current information of a main conducting branch, a first voltage sensor PT1 for acquiring the voltage information of a mains supply, a second voltage sensor PT2 for acquiring the voltage information of a mobile power supply vehicle S1 and a third voltage sensor PT3 for acquiring the voltage information of a wire outlet end; the first current sensor CT1, the second current sensor CT2, the first voltage sensor PT1, the second voltage sensor PT2 and the third voltage sensor PT3 are connected with the main control unit MC 1.
4. The uninterrupted switching system of low-voltage transformer area loads as claimed in claim 3, wherein: the three sensors are respectively provided with three A \ B \ C three phases, wherein the three phases are respectively corresponding to the first current sensor CT1, the second current sensor CT2, the first voltage sensor PT1, the second voltage sensor PT2 and the third voltage sensor PT 3.
5. The uninterrupted switching system of low-voltage transformer area loads as claimed in claim 4, wherein:
the first current sensor CT1 is arranged on a commercial power bypass, and the first current sensor CT1 is positioned between the first breaker Q1 and the outlet end of the press-fit box JP 1;
the second current sensor CT2 is arranged on the main conductive branch, and the second current sensor CT2 is positioned between the second circuit breaker Q2 and the outlet end of the press-fit box JP 1;
the first voltage sensor PT1 is arranged on a mains supply bypass, and the first voltage sensor PT1 is positioned between the first breaker Q1 and the inlet wire end of the press-fit box JP 1;
the second voltage sensor PT2 is arranged on the main conductive branch, and the second voltage sensor PT2 is positioned between the second circuit breaker Q2 and the mobile power supply vehicle S1;
the third voltage sensor PT3 is arranged on the main conducting branch or the commercial power bypass, the third voltage sensor PT3 is positioned between the second circuit breaker Q2 and the outlet end of the low-voltage distribution box JP1, or the third voltage sensor PT3 is positioned between the first circuit breaker Q1 and the outlet end of the low-voltage distribution box JP 1.
6. A working method of a low-voltage transformer area load uninterrupted switching system is characterized by comprising the following steps:
1) when the load needs to be transferred to the mobile box type transformer/power supply vehicle S1 from the mains supply side, the main control unit MC1 acquires the voltage value of each phase of the corresponding mobile box type transformer/power supply vehicle S1 and the voltage value of each phase of the mains supply through the second voltage sensor PT2 and the third voltage sensor PT3, judges whether the voltage values of the mobile box type transformer/power supply vehicle S1 and the mains supply are within an error range and whether the phase sequences are consistent, and if the conditions are met, enters a waiting switching stage;
2) at the moment, when the master control unit MC1 detects the instantaneous voltage drop of the outlet end of the low-voltage distribution box JP1 through the third voltage sensor PT3, the master control unit MC1 controls the electronic solid-state switch D1 to be switched on, and the load supplies power to the load through the mobile box transformer/power supply vehicle S1 and the short-time conductive branch, so that the load is guaranteed to supply power uninterruptedly;
3) the master control unit MC1 controls the second circuit breaker Q2 to close, so that the main conductive branch is conducted; when the main control unit MC1 detects that the main conductive branch has current through the second current sensor CT2, the main control unit MC1 controls the short-time conductive branch to be disconnected through the electronic solid-state switch D1, at the moment, the load supplies power to the load through the mobile box transformer/power supply vehicle S1 and the main conductive branch, and at the moment, the power failure maintenance operation is allowed to be carried out on the high-voltage side of the commercial power;
4) when the high-voltage side of the commercial power is in a power failure state, allowing the commercial power bypass to be connected with the inlet wire end of the low-voltage distribution box JP 1;
5) after the high-voltage side is overhauled, the main control unit MC1 correspondingly monitors the voltage of the incoming line end of the low-voltage distribution box JP1 and the voltage of the outgoing line end of the low-voltage distribution box JP1 through a first voltage sensor PT1 and a third voltage sensor PT3, judges whether the voltage values of the incoming line end and the outgoing line end of the low-voltage distribution box JP1 are in an error range and whether the phase sequence is consistent, and if the conditions are met, the main control unit MC1 drives an electronic solid switch D1 to be conducted to enable a short-time conductive branch to be conducted and simultaneously drives a second circuit breaker Q2 to be switched off to enable a main conductive branch to be disconnected; at the moment, the load is supplied with power in a short time through a mobile box transformer/power supply vehicle S1 and a short-time conductive branch;
6) the main control unit MC1 controls a first breaker Q1 to switch on to conduct a mains supply bypass, when the main control unit MC1 detects that current appears on the mains supply bypass through a first current sensor CT1, the main control unit MC1 cuts off a short-time conducting branch through an electronic solid-state switch D1, and at the moment, the mains supply supplies power to a load through the mains supply bypass;
7) after a low-voltage distribution box JP1 general incoming line switch is manually switched on, the main control unit MC1 controls the first circuit breaker Q1 to be switched off, so that a mains supply bypass is disconnected, and the operation of returning the load from a mobile box transformer substation/power supply vehicle S1 to mains supply is completed in a non-power-cut mode.
7. The operating method of the low-voltage transformer area load uninterrupted switching system according to claim 6, wherein: the short-time conducting branch is provided with a third circuit breaker Q3, the third circuit breaker Q3 is connected with an electronic solid-state switch D1 in series, and when the short-time conducting branch is switched on, the load supplies power to the load through a mobile box transformer/power supply vehicle S1, the third circuit breaker Q3 and the electronic solid-state switch D1.
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| CN202110821338.3A CN113595227B (en) | 2021-07-20 | 2021-07-20 | Low-voltage transformer area load uninterrupted switching system and working method thereof |
| PCT/CN2021/136824 WO2023000585A1 (en) | 2021-07-20 | 2021-12-09 | Low-voltage transformer area load non-power-cut switching system and working method thereof |
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| CN202110821338.3A CN113595227B (en) | 2021-07-20 | 2021-07-20 | Low-voltage transformer area load uninterrupted switching system and working method thereof |
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Cited By (2)
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| CN114552654A (en) * | 2022-03-22 | 2022-05-27 | 国网冀北电力有限公司电力科学研究院 | Grid-connected electrical system |
| WO2023000585A1 (en) * | 2021-07-20 | 2023-01-26 | 杭州电力设备制造有限公司 | Low-voltage transformer area load non-power-cut switching system and working method thereof |
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| CN116978751A (en) * | 2023-08-03 | 2023-10-31 | 国网山东省电力公司东营供电公司 | Bypass switch with metering nuclear phase remote control switch-on/off function |
| CN117977702A (en) * | 2024-01-25 | 2024-05-03 | 湖北能源集团鄂州发电有限公司 | Microcomputer-aided nuclear phase three-phase automatic quasi-synchronization device and synchronization parallel method |
| CN118199250B (en) * | 2024-05-16 | 2024-08-09 | 安徽徽电科技股份有限公司 | Low-voltage dual-power quick-cutting system and method thereof |
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| CN113595227B (en) | 2023-09-15 |
| WO2023000585A1 (en) | 2023-01-26 |
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