CN220628951U - Bypass type medium-voltage dual-power automatic conversion system - Google Patents
Bypass type medium-voltage dual-power automatic conversion system Download PDFInfo
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- CN220628951U CN220628951U CN202322315647.0U CN202322315647U CN220628951U CN 220628951 U CN220628951 U CN 220628951U CN 202322315647 U CN202322315647 U CN 202322315647U CN 220628951 U CN220628951 U CN 220628951U
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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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Abstract
The utility model provides a bypass type medium-voltage dual-power automatic conversion system, which relates to the technical field of common power supply inlet wire cabinets, standby power supply inlet wire cabinets and control cabinets; the control cabinet is electrically connected with the common power supply inlet wire cabinet and the standby power supply inlet wire cabinet; the common power supply inlet cabinet provides a mains supply, and is provided with a main power switch I and a bypass switch I aiming at the mains supply; the standby power supply inlet wire cabinet provides a standby power supply, and a second main power supply switch and a second bypass switch are arranged for the standby power supply; the bypass type medium-voltage dual-power automatic conversion system provides bypass switches for two paths of power supply, and can be automatically switched to corresponding bypass switches when a common main power switch or a standby main power switch is maintained, so that uninterrupted power supply of the whole circuit can be realized.
Description
Technical Field
The utility model relates to the technical field, in particular to a bypass type medium-voltage dual-power automatic conversion system.
Background
In recent years, with the development and application of new technologies such as big data, cloud computing, artificial intelligence, etc., many new sites have been in a new development stage for the use and requirements of electric energy. The medium-voltage dual power conversion system is a standby power switching system for a medium-voltage power system, and aims to ensure the continuity and reliability of power supply, and has been approved by design houses, general packages and users in various fields, such as data centers, scientific research institutions, semiconductors, highways, national defense and military industry, and the like.
The requirements of users on the power grid and the power transmission and distribution process are gradually improved, and the requirements are mainly reflected in the aspects of safety, reliability, persistence, easy overhaul and maintenance of power supply equipment and the like, so that the dual-power automatic conversion system with the typical characteristics is more and more widely applied.
The medium-voltage double-power automatic conversion system can greatly improve the power supply reliability of the system, monitor the states of two paths of power supplies in real time, and convert the load to the standby power supply in a short time when faults such as overvoltage, undervoltage, phase failure, frequency and the like occur in the common power supply, so that the continuous and stable operation of important loads is ensured, and the loss possibly caused by power failure is reduced to the minimum. However, due to the importance of the medium-voltage dual-power supply product, once the medium-voltage dual-power supply product fails, a large-area power failure of the power distribution system is caused, and due to the particularity of the medium-voltage product, the product replacement and maintenance time is long, so that the single-point fault hidden danger is reduced, and a backup or bypass is required to be set for the medium-voltage dual-power supply conversion system.
Therefore, the conventional medium-voltage dual-power automatic switching system has a part to be improved, and the utility model provides a bypass-type medium-voltage dual-power automatic switching system.
Disclosure of Invention
Aiming at the defects existing in the prior art, the utility model aims to provide a bypass type medium-voltage dual-power automatic conversion system, which comprises the following specific schemes:
a bypass type medium-voltage dual-power automatic conversion system consists of three switch cabinets, namely a common power supply inlet cabinet, a standby power supply inlet cabinet and a control cabinet;
the control cabinet is electrically connected with the common power supply inlet wire cabinet and the standby power supply inlet wire cabinet;
the common power supply inlet cabinet provides a mains supply, and is provided with a main power switch I and a bypass switch I aiming at the mains supply;
the standby power supply inlet wire cabinet provides a standby power supply, and a second main power supply switch and a second bypass switch are arranged for the standby power supply;
when the system is powered by the common power supply inlet wire cabinet, the first main power switch, the second main power switch and the second bypass switch corresponding to the common power supply inlet wire cabinet are closed, and when the system is powered by the standby power supply inlet wire cabinet, the second main power switch is closed, and the first main power switch, the first bypass switch and the second bypass switch are opened;
when the main power switch I corresponding to the common power inlet wire is maintained, the bypass switch I is closed;
when the main power switch II of the standby power supply inlet wire cabinet is maintained, the bypass switch II is closed.
Further, two common main power circuit breakers VCB1 and two common bypass circuit breakers VCB2 which are arranged up and down are arranged in the common power supply incoming cabinet, and two standby main power circuit breakers VCB3 and two standby bypass circuit breakers VCB4 which are arranged up and down are arranged in the standby power supply incoming cabinet;
a first switching-on and switching-off mechanism and an ATS mechanical interlocking are arranged between the common main power circuit breaker VCB1 and the standby main power circuit breaker VCB3, a second switching-on and switching-off mechanism and an ATS mechanical interlocking are arranged between the common bypass circuit breaker VCB2 and the standby bypass circuit breaker VCB4, and the first ATS mechanical interlocking and the second ATS mechanical interlocking are respectively provided with a mechanical connecting rod which is in cross connection with the first switching-off mechanism and the second switching-on and switching-off mechanism so as to realize that only one of the two circuit breakers can be switched on;
an electrical interlock I is arranged between the common main power circuit breaker VCB1 and the common bypass circuit breaker VCB2, an electrical interlock II is arranged between the standby main power circuit breaker VCB3 and the standby bypass circuit breaker VCB4, and the electrical interlock I and the electrical interlock II are used for realizing that only one of two circuit breakers of the same incoming line cabinet can be switched on;
two locks and one key are respectively arranged between the common main power circuit breaker VCB1 and the standby bypass circuit breaker VCB4 and between the common bypass circuit breaker VCB2 and the standby main power circuit breaker VCB3 to realize that one of the two circuit breakers is in a working position.
Further, the common power supply inlet wire cabinet and the standby power supply inlet wire cabinet are composed of a cabinet body and a partition board, and a space formed between the partition board and the cabinet body comprises a handcart room, a cable room for the inlet wire cabinet and a bus room for the inlet wire cabinet.
Further, the control cabinet comprises a cable chamber for the control cabinet, a bus chamber for the control cabinet and a secondary chamber, wherein the bus chamber for the control cabinet and the cable chamber for the control cabinet are arranged on the rear side of the control cabinet up and down, and the secondary chamber is arranged on the front side of the control cabinet.
Furthermore, a main loop conductor is arranged between the handcart room and the cable room for the control cabinet and between the handcart room and the bus room for the control cabinet in a penetrating way, and when the main loop conductor penetrates through the partition board, the main loop conductor is isolated by adopting a funnel-shaped insulating contact cover.
Furthermore, the system is suitable for an indoor three-phase alternating current 50Hz medium-voltage dual power supply with rated voltage of 3.6 kV-12 kV.
Compared with the prior art, the utility model has the following beneficial effects:
(1) The utility model adopts the combination of three switch cabinets, the bypass type is a double bypass structure, and the main power switch of the two paths of power supplies is provided with the bypass switch, namely, the common power supply and the standby power supply are both provided with the bypass switch, so that the power supply of the power supply is not interrupted during maintenance.
(2) The utility model has mechanical interlocking and electrical interlocking at the same time to ensure safer operation, thereby realizing uninterrupted power supply of the whole circuit and ensuring the requirements of the continuity and stability of the power consumption of the key load.
(3) The dual-power automatic switching system can monitor and control the first main power switch and the first bypass switch of the common power supply, the second main power switch and the second bypass switch of the standby power supply, control the positions of all the circuit breakers of the feeder circuits, the positions of the handcarts and each circuit breaker, and monitor the voltage and the frequency of the bus section at the same time.
Drawings
FIG. 1 is a schematic overall view of an embodiment of the present utility model;
fig. 2 is a schematic diagram of the internal structure of the incoming line cabinet;
FIG. 3 is an internal schematic diagram of a control cabinet;
fig. 4 is a flow chart of the operation of the present utility model.
Reference numerals: 1. a common power supply inlet wire cabinet; 2. a standby power supply inlet wire cabinet; 3. a control cabinet; 4. a first main power switch; 5. a bypass switch I; 6. a second main power switch; 7. a bypass switch II; 8. ATS mechanical interlock one; 9. ATS mechanical interlock two; 10. a handcart room; 11. a cable chamber for a control cabinet; 12. bus-bar chamber for control cabinet; 13. a secondary chamber; 14. a current transformer; 15. a voltage transformer; 16. a cable chamber for a wire inlet cabinet; 17. bus-bar chamber for inlet wire cabinet.
Detailed Description
The present utility model will be described in further detail with reference to examples and drawings, but embodiments of the present utility model are not limited thereto.
The utility model relates to a bypass type medium voltage dual-power automatic conversion system with a double-layer cabinet structure, which is a device for realizing conversion between two paths of medium voltage power supplies and always keeping power supply of only one path of medium voltage power supply. The dual-power automatic conversion system is suitable for switching the power supply of important loads in an indoor three-phase alternating-current 50Hz medium-voltage system with rated voltage of 3.6kV to 12kV when an emergency power supply exists, so as to meet the requirement of reliable and continuous power supply.
Meanwhile, the double-power automatic conversion system is provided with the bypass switch for the two-path power inlet switch, so that the power supply is not interrupted during maintenance, and meanwhile, the double-power automatic conversion system is provided with mechanical interlocking and electrical interlocking to ensure safer operation, so that uninterrupted power supply of the whole circuit is realized, and the requirements on the persistence and stability of power consumption of a key load are ensured.
The medium-voltage dual power supply is two paths of medium-voltage power supplies, and the conversion types between the two paths of power supplies are as follows: mains supply-diesel engine. In the present utility model, the commercial power is the commercial power, the diesel generator is the common power, and the diesel generator is the standby power. The bypass type power supply is a double bypass structure, namely a common power supply and a standby power supply are provided with bypass switches, and a bypass type scheme is provided for high-requirement application, so that complete power supply switching capacity can be provided when equipment maintenance and overhaul is performed, and uninterrupted power supply on a load side is realized.
In terms of appearance mechanical structure, as shown in fig. 1, the automatic conversion system is a combination of three switch cabinets, wherein the three switch cabinets comprise two incoming line cabinets and one control cabinet 3, meet the performance requirements of LSC2B types classified according to operation continuity in the national standard GB/T3906, and meet the related requirements of the IEC 62271:200 standard.
As shown in fig. 2, one of the incoming line cabinets is a common power supply incoming line cabinet 1, adopts a centrally-mounted double-layer cabinet structure and is used for being provided with two circuit breakers, a common main power supply circuit breaker VCB1 and a common bypass circuit breaker VCB2 respectively correspond to a main power supply and a bypass power supply in the common power supply incoming line cabinet 1, the functions of the two incoming line cabinets are a main power supply switch 4 and a bypass switch 5 of the common power supply, and the common main power supply circuit breaker VCB1 and the common bypass circuit breaker VCB2 are arranged in two different cabinets of the common power supply incoming line cabinet 1 up and down. The other incoming line cabinet is a standby power incoming line cabinet 2, also adopts a middle-mounted double-layer cabinet structure, is also used for being provided with two circuit breakers, and is characterized in that a standby main power circuit breaker VCB3 and a standby bypass circuit breaker VCB4 respectively correspond to a main power supply and a bypass power supply in the standby power incoming line cabinet 2, and are respectively provided with a main power switch II 6 and a bypass switch II 7 of the standby power supply, and the standby main power circuit breaker VCB3 and the standby bypass circuit breaker VCB4 are arranged in two different cabinets of the standby power incoming line cabinet 2 up and down.
The common power supply inlet wire cabinet 1, the standby power supply inlet wire cabinet 2 of this embodiment, when assembling the same functional unit, can save two cabinet bodies than the individual layer cabinet of same type, save the cost.
The common main power circuit breaker VCB1, the common bypass circuit breaker VCB2, the standby main power circuit breaker VCB3, and the standby bypass circuit breaker VCB4 all adopt existing handcart type circuit breakers, and the handcart type circuit breaker is a switching device used in a medium-low voltage power system, and is commonly used in places such as power transmission and distribution stations, industrial equipment, buildings and the like. The manual switch has the characteristic of manual operation, and can manually push the movable handcart of the circuit breaker to realize switching-on and switching-off operations.
In general, a cart-type circuit breaker is generally composed of the following parts:
the breaker body: the breaker body is a main switching device for controlling the on-off of a circuit.
Chassis truck: the chassis is a mobile device, and the breaker body is mounted on the chassis. Rails are arranged on the left side and the right side in the switch cabinet, and the chassis drives the breaker body to move back and forth in the switch cabinet along the rails.
Contact arm and contact: the contact arm and the contact are arranged on the breaker body, and are generally arranged in two rows, namely three rows of ABC three phases. Through the front and back movement of the chassis, the circuit breaker handcart is positioned at a test position and a working position in the switch cabinet, and after reaching the working position, the contact arm, the contact and the upper and lower branch buses are communicated, so that the circuit breaker can perform switching-on and switching-off operations.
In this embodiment, when the common main power circuit breaker VCB1, the common bypass circuit breaker VCB2, the standby main power circuit breaker VCB3, and the standby bypass circuit breaker VCB4 are in operation, the opening and closing of the circuit breaker, the pushing and moving out of the operation handcart, and the like can be performed on the cabinet door by operating the contact arm, the contact, the upper and lower branch buses, and other elements.
In combination with fig. 2 and 3, in order to install the circuit breaker, each incoming line cabinet specifically comprises a cabinet body and withdrawable parts, the partition plates between the outer shell of the cabinet body and each functional unit are made of high-quality aluminum-zinc-coated steel plates, and each part of the cabinet body is formed by bolting bolts. The distribution of the partition plates mainly divides the common power supply inlet wire cabinet 1 and the standby power supply inlet wire cabinet 2 into two handcart chambers 10, a cable chamber 16 for the inlet wire cabinet and a bus chamber 17 for the inlet wire cabinet, wherein the handcart chambers 10 are areas for storing and operating handcart type circuit breakers, such as the common power supply inlet wire cabinet 1, and the common main power supply circuit breaker VCB1 and the common bypass circuit breaker VCB2 are respectively arranged in the two handcart chambers 10; the cable compartment 16 for the incoming cabinet is used for storing the area of the cable in the power system, and has the characteristics of fire resistance, explosion resistance, water resistance and the like, so as to ensure the safe operation of the cable; the bus bar compartment 17 for the incoming line cabinet is an area for concentrated connection and distribution of electric power.
In order to realize power supply to two wire inlet cabinets, the control cabinet 3 is divided into a cable chamber 11 for the control cabinet, a bus chamber 12 for the control cabinet and a secondary chamber 13, wherein the bus chamber 12 for the control cabinet and the bus chamber 17 for the wire inlet cabinet are consistent in function and are areas for centralized connection and distribution of electric energy, and in the bus chamber 12 for the control cabinet, all power supplies, loads and equipment are connected together through buses to realize transmission and distribution of the electric energy; the secondary chamber 13 is also called a low-voltage chamber and is used for installing and connecting auxiliary equipment and equipment rooms or areas of a secondary circuit, the secondary chamber 13 carries functions of measurement, control, protection, communication and the like of a power system, and in the secondary chamber 13, electric energy metering equipment, a protection relay, a control switch, communication equipment and the like are installed and used for realizing monitoring, control and protection of the power system.
In order to realize the transmission and distribution of electric energy, main loop conductors, such as cables and buses, are arranged between the handcart room 10 and the cable room 11 for the control cabinet and between the handcart room and the bus room 12 for the control cabinet, and the main loop conductors are used as conductors for carrying main current, and are isolated by adopting a funnel-shaped insulating contact cover when penetrating through the partition plates. In the utility model, each functional unit (except the secondary chamber 13) is provided with a pressure release channel, one side of a cover plate of the pressure release channel is fastened by a metal bolt, and the other side of the cover plate is fastened by an M6 nylon screw. And the cable chamber 11 for the control cabinet and the bus chamber 12 for the control cabinet meet the condition that the air gap between the phases and the ground is more than or equal to 125mm.
As shown in fig. 2, functional units such as a current transformer 14, a voltage transformer 15, a lightning arrester and the like are arranged at the rear part and the rear lower part of the cabinet body of the incoming cabinet according to actual demands of users so as to meet the requirements of collecting current and voltage signals and the like of the control cabinet 3.
When the two incoming line cabinets are arranged side by side, the common main power supply breaker VCB1 and the standby main power supply breaker VCB3 are positioned at the same height, and the common bypass breaker VCB2 and the standby bypass breaker VCB4 are positioned at the same height. The two circuit breakers arranged adjacently at the same height of the two incoming line cabinets are mechanically and electrically interlocked, the two circuit breakers of the same incoming line cabinet are electrically interlocked, and the two circuit breakers arranged alternately of the two incoming line cabinets are mechanically interlocked by adopting two locks and one key. The circuit breaker has perfect mechanical interlocking and electric interlocking functions, and ensures the safe use of the circuit breaker in a power system.
Referring to fig. 2 and 4, specifically, a first switching-on and switching-off mechanism is installed between the common power supply incoming line cabinet 1 and the standby power supply incoming line cabinet 2 and between the common main power supply circuit breaker VCB1 and the standby main power supply circuit breaker VCB3, an ATS mechanical interlock 8 is installed between the common main power supply circuit breaker VCB1 and the standby main power supply circuit breaker VCB3, and the ATS mechanical interlock 8 is connected with the switching-off mechanism through a mechanical connecting rod. Similarly, a second switching-on and switching-off mechanism and an ATS mechanical interlocking second 9 are also arranged between the common bypass breaker VCB2 and the standby bypass breaker VCB4, and the ATS mechanical interlocking second 9 is connected with the second switching-off mechanism through a mechanical connecting rod. The mechanical connecting rod converts one form of mechanical kinetic energy into another form of mechanical kinetic energy through rotation and relative position change of the connecting rod, so that power control is realized on the first opening and closing mechanism and the second opening and closing mechanism, and the specific structure of the mechanical connecting rod is not limited, so long as the control on the first opening and closing mechanism and the second opening and closing mechanism can be realized.
ATS mechanical interlock is an existing device for automatically switching power sources, which is mainly used to automatically switch a load from a main power source to a standby power source when the main power source fails or is interrupted, so as to ensure continuous power supply, and the principle of mechanical interlock is to limit the operation of a circuit breaker according to the position and state of a switching mechanism. For example, when the switching mechanism is in the primary power position, the backup power circuit breaker will be locked and unable to close. On the contrary, when the switching mechanism is positioned at the position of the standby power supply, the main power supply circuit breaker is locked and cannot be switched on. In the embodiment, when the first ATS mechanical interlock 8 and the second ATS mechanical interlock 9 are in operation, the first ATS mechanical interlock 8 can only realize the switching on of one of the common main power supply circuit breaker VCB1 and the standby main power supply circuit breaker VCB3, and the second ATS mechanical interlock 9 can only realize the switching on of one of the common bypass circuit breaker VCB2 and the standby bypass circuit breaker VCB4, so that the two circuit breakers in the common power supply inlet cabinet 1 and the standby power supply inlet cabinet 2 cannot be simultaneously switched on when in the working position.
The common main power circuit breaker VCB1 and the standby main power circuit breaker VCB3 are provided with secondary line interlocking, the common bypass circuit breaker VCB2 and the standby bypass circuit breaker VCB4 are also provided with secondary line interlocking, and the secondary line interlocking is an existing electrical interlocking mechanism and is used for ensuring interlocking protection during operation between two circuit breakers or switches in an electrical system, and when switching on of any one circuit breaker is ensured by using switching-on and switching-off signals of the two circuit breakers, the other circuit breaker cannot be switched on. The interlock mechanism is controlled by using signals on the secondary line, and can achieve mutual coordination and limitation between circuit breakers under specific conditions required for faults, maintenance or operation. For example, between the normal main power circuit breaker VCB1 and the standby main power circuit breaker VCB3, the related signal is transmitted from the normal main power circuit breaker VCB1 to the standby main power circuit breaker VCB3 through the secondary line interlock. These signals may be electrical signals or digital signals, which indicate the state of the circuit breaker or the operation to be performed, and the standby main power circuit breaker VCB3 receives and analyzes the signals from the secondary line, and makes a logical judgment based on the interlock condition, and determines whether the closing or opening operation is permitted.
Similarly, the operations between the common bypass breaker VCB2 and the backup bypass breaker VCB4 are analogized.
And second, an electric interlock I is arranged between the common main power circuit breaker VCB1 and the common bypass circuit breaker VCB2, and an electric interlock II is arranged between the standby main power circuit breaker VCB3 and the standby bypass circuit breaker VCB4. The electrical interlock is an upper control mechanism for ensuring safe operation of the electrical system, in this embodiment, a specific mode of the electrical interlock is not limited, for example, a secondary line interlock is adopted, the electrical interlock is same as that only one of the two circuit breakers can be switched on through switching-on and switching-off signals of the common main power circuit breaker VCB1 and the common bypass circuit breaker VCB2, and the electrical interlock is same as that only one of the two circuit breakers can be switched on through switching-on and switching-off signals of the standby main power circuit breaker VCB3 and the standby bypass circuit breaker VCB4.
Finally, a two-lock one-key mechanical interlocking is arranged between the common main power circuit breaker VCB1 and the standby bypass circuit breaker VCB4, and a two-lock one-key mechanical interlocking is arranged between the common bypass circuit breaker VCB2 and the standby main power circuit breaker VCB3, so that the two circuit breakers are alternatively located at the working position or the test position through the operation of the two-lock one-key mechanical interlocking. Two lock-key mechanical interlocking is a common mechanical interlocking mechanism, the principle being to control the operation of two circuit breakers by one key, ensuring that only one of the circuit breakers can be opened or closed under certain conditions. For example, an interlocking mechanism is specifically required to be arranged between the common main power circuit breaker VCB1 and the standby bypass circuit breaker VCB4, the common main power circuit breaker VCB1 and the standby bypass circuit breaker VCB4 are both provided with a lock cylinder, the two lock cylinders are respectively connected with the interlocking mechanism, a shared key hole is formed in the interlocking mechanism, a specific key can be inserted into the interlocking mechanism, and the key can be rotated or moved to realize specific circuit breaker operation when the key is inserted into the interlocking mechanism. For example, when the normal main power circuit breaker VCB1 is in the operating state, the key cannot be pulled out from the interlock mechanism, which prevents the operation of the backup bypass circuit breaker VCB4, and the key can be released only after the normal main power circuit breaker VCB1 is restored to the normal state, so that the operation of the backup bypass circuit breaker VCB4 is performed.
Similarly, the operation between the common bypass breaker VCB2 and the backup main power breaker VCB3 is analogized.
As for the control cabinet 3, the control cabinet 3 is a common device, and the front surface of the control cabinet 3 is provided with a controller which has the functions of liquid crystal display, over-voltage and under-voltage current, adjustable conversion delay and the like. The controller can monitor and control the first main power switch 4 and the first bypass switch 5 of the common power supply, the second main power switch 6 and the second bypass switch 7 of the standby power supply, and simultaneously control the positions of all the circuit breakers of the feeder circuits, the positions of the handcarts and each circuit breaker, and can monitor the voltage and the frequency of the bus section.
The normal operation process of the medium-voltage double-power automatic conversion system comprises the following steps:
during normal use, the main power supply of the common power supply incoming cabinet 1 supplies commercial power, namely the common main power supply breaker VCB1 is closed, the other 3 breakers (the common bypass breaker VCB2, the standby main power supply breaker VCB3 and the standby bypass breaker VCB 4) are in an interlocking relation with the common main power supply breaker VCB1 and are in an off state, when the commercial power is lost, the diesel generator is in a hot standby state, a worker cuts off outgoing breakers of corresponding loads according to a preset sequence through the control cabinet 3, the common main power supply breaker VCB1 is opened, the standby main power supply breaker VCB3 in the standby power supply incoming cabinet 2 is combined, and then the outgoing breakers are put into each load according to the preset sequence in a time delay mode. After the commercial power is recovered, the outgoing line breakers of corresponding loads are cut off according to a preset sequence, the standby power supply (diesel generator) is cut off, the standby main power supply breaker VCB3 is disconnected, the common main power supply breaker VCB1 of the common power supply incoming line cabinet 1 is combined, and then the load outgoing line breakers are put into step by step according to the preset sequence.
The bypass breaker operation process of the medium-voltage double-power automatic switching system comprises the following steps:
when the common main power supply breaker VCB1 in the common power supply incoming cabinet 1 is maintained and overhauled, the common main power supply breaker VCB1 is disconnected, and the system automatically switches on the common bypass breaker VCB2 in the common power supply incoming cabinet 1. When the system is powered by the diesel generator, when the standby main power circuit breaker VCB3 of the standby power inlet wire cabinet 2 is maintained and overhauled, the standby main power circuit breaker VCB3 is disconnected, and the system automatically switches on the standby bypass circuit breaker VCB4 in the standby power inlet wire cabinet 2.
Considering that the model specification parameters of the circuit breaker are the same, the VCB1, the VCB2, the VCB3 and the VCB4 can be mutually bypassed to realize the uninterrupted power supply on the load side.
The bypass type medium-voltage double-power automatic conversion system with the double-layer cabinet structure can automatically cut off or put in a medium-voltage feed-out line according to a preset sequence in the conversion of the commercial power and the standby power, and the reliability of an important power supply loop is ensured.
In summary, the utility model provides a bypass switch for both power supplies to realize uninterrupted power supply of the whole circuit, and simultaneously has mechanical interlocking and electrical interlocking to ensure safer operation, thereby ensuring the requirements of the continuity and stability of the power consumption of the key load.
The above description is only a preferred embodiment of the present utility model, and the protection scope of the present utility model is not limited to the above examples, and all technical solutions belonging to the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that modifications and adaptations to the present utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.
Claims (6)
1. The bypass type medium-voltage dual-power automatic conversion system is characterized by comprising three switch cabinets, namely a common power supply incoming cabinet (1), a standby power supply incoming cabinet (2) and a control cabinet (3);
the control cabinet (3) is electrically connected with the common power supply incoming line cabinet (1) and the standby power supply incoming line cabinet (2);
a common power supply inlet cabinet (1) provides a mains supply, and a main power switch I (4) and a bypass switch I (5) are arranged aiming at the mains supply;
the standby power supply inlet wire cabinet (2) provides a standby power supply, and a main power supply switch II (6) and a bypass switch II (7) are arranged for the standby power supply;
when the system is powered by the common power supply inlet wire cabinet (1), a first main power switch (4) corresponding to the common power supply inlet wire cabinet (1) is closed, a first bypass switch (5), a second main power switch (6) and a second bypass switch (7) are opened, and when the system is powered by the standby power supply inlet wire cabinet (2), the second main power switch (6) is closed, and the first main power switch (4), the first bypass switch (5) and the second bypass switch (7) are opened;
when the main power switch I (4) corresponding to the common power inlet wire is maintained, the bypass switch I (5) is closed;
when the standby power supply inlet wire cabinet (2) is maintained by the second main power supply switch (6), the second bypass switch (7) is closed.
2. The bypass type medium-voltage double-power-supply automatic switching system according to claim 1, wherein two common main power supply breakers VCB1 and two common bypass breakers VCB2 which are arranged up and down are arranged in the common power supply incoming cabinet (1), and two standby main power supply breakers VCB3 and two standby bypass breakers VCB4 which are arranged up and down are arranged in the standby power supply incoming cabinet (2);
a first switching-on and switching-off mechanism and an ATS mechanical interlock (8) are arranged between the common main power circuit breaker VCB1 and the standby main power circuit breaker VCB3, a second switching-on and switching-off mechanism and an ATS mechanical interlock (9) are arranged between the common bypass circuit breaker VCB2 and the standby bypass circuit breaker VCB4, and the first ATS mechanical interlock (8) and the second ATS mechanical interlock (9) are respectively provided with a mechanical connecting rod for cross-connecting the first switching-off mechanism and the second switching-on and switching-off mechanism so as to realize that only one of the two circuit breakers can be switched on;
an electrical interlock I is arranged between the common main power circuit breaker VCB1 and the common bypass circuit breaker VCB2, an electrical interlock II is arranged between the standby main power circuit breaker VCB3 and the standby bypass circuit breaker VCB4, and the electrical interlock I and the electrical interlock II are used for realizing that only one of two circuit breakers of the same incoming line cabinet can be switched on;
two locks and one key are respectively arranged between the common main power circuit breaker VCB1 and the standby bypass circuit breaker VCB4 and between the common bypass circuit breaker VCB2 and the standby main power circuit breaker VCB3 to realize that one of the two circuit breakers is in a working position.
3. The bypass type medium-voltage dual-power automatic switching system according to claim 1, wherein the common power supply inlet wire cabinet (1) and the standby power supply inlet wire cabinet (2) are composed of a cabinet body and a partition board, and a space formed between the partition board and the cabinet body comprises a handcart room (10), a cable room (16) for the inlet wire cabinet and a bus room (17) for the inlet wire cabinet.
4. The bypass type medium-voltage dual-power automatic switching system according to claim 3, wherein the control cabinet (3) is composed of a control cabinet cable chamber (11), a control cabinet bus chamber (12) and a secondary chamber (13), the control cabinet bus chamber (12) and the control cabinet cable chamber (11) are vertically arranged on the rear side of the control cabinet (3), and the secondary chamber (13) is arranged on the front side of the control cabinet (3).
5. The bypass type medium voltage dual power automatic switching system according to claim 4, wherein a main loop conductor is arranged between the handcart room (10) and the cable room (11) for the control cabinet and between the handcart room and the bus room (12) for the control cabinet in a penetrating way, and when the main loop conductor penetrates through the partition board, the main loop conductor is isolated by adopting a funnel-shaped insulating contact cover.
6. The bypass type medium voltage dual power supply automatic switching system according to claim 1, wherein the system is suitable for an indoor three-phase alternating current 50Hz medium voltage dual power supply with rated voltage of 3.6 kV-12 kV.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322315647.0U CN220628951U (en) | 2023-08-28 | 2023-08-28 | Bypass type medium-voltage dual-power automatic conversion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322315647.0U CN220628951U (en) | 2023-08-28 | 2023-08-28 | Bypass type medium-voltage dual-power automatic conversion system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220628951U true CN220628951U (en) | 2024-03-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322315647.0U Active CN220628951U (en) | 2023-08-28 | 2023-08-28 | Bypass type medium-voltage dual-power automatic conversion system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220628951U (en) |
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2023
- 2023-08-28 CN CN202322315647.0U patent/CN220628951U/en active Active
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