CN109659938B - Voltage switching circuit of low-voltage side of voltage transformer - Google Patents
Voltage switching circuit of low-voltage side of voltage transformer Download PDFInfo
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- CN109659938B CN109659938B CN201910071674.3A CN201910071674A CN109659938B CN 109659938 B CN109659938 B CN 109659938B CN 201910071674 A CN201910071674 A CN 201910071674A CN 109659938 B CN109659938 B CN 109659938B
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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Abstract
The application discloses a voltage switching circuit of a low-voltage side of a voltage transformer, which comprises a first voltage transformer module, a second voltage transformer module and a voltage switching module, wherein a first input end of the voltage switching module is connected with the low-voltage side of the first voltage transformer module, a second input end of the voltage switching module is connected with the low-voltage side of the second voltage transformer module, a first output end of the voltage switching module is connected with secondary equipment, and the voltage switching module can detect the opening and closing states of a breaker QF1 and a breaker QF2 and control the on-off state between the first input end of the voltage switching module and the first output end of the voltage switching module and the on-off state between the second input end of the voltage switching module and the first output end of the voltage switching module, so that the purpose that the secondary equipment can continuously supply power when a double-loop system breaks down is required.
Description
Technical Field
The application relates to the field of power supply systems, in particular to a voltage switching circuit of a low-voltage side of a voltage transformer.
Background
The existing 6-10kV power supply system is usually double-loop power supply, the double-loop power supply comprises first power supply equipment, second power supply equipment, a breaker QF1, a breaker QF2 and a high-voltage bus, the first power supply equipment is connected with one end of the breaker QF1, the other end of the breaker QF1 is connected with the high-voltage bus, the second power supply equipment is connected with one end of the breaker QF2, the other end of the breaker QF2 is connected with the high-voltage bus, the second power supply equipment is put into operation after the first power supply equipment fails, the two power supply equipment are standby, and a voltage transformer is used for transforming high voltage into standard secondary voltage of 100V according to a proportion relationship and is used for protection, metering and instrument devices.
In order to save the space of a power distribution room and equipment investment, a special bus voltage transformer cabinet (PT cabinet) is not arranged in a power supply scheme, 100V bus voltage used by a protection, metering and instrument device of a feed-out line cabinet is taken from a voltage transformer at the inlet side of power supply equipment, when a power supply system is powered by first power supply equipment, 100V bus voltage used by secondary equipment such as the protection, metering and instrument device is taken from the voltage transformer at the output end of the first power supply equipment, when the first power supply equipment fails and power is supplied by second power supply equipment, the voltage transformer at the inlet side of the first power supply equipment loses electricity, and the secondary equipment does not have bus voltage, so that a protection device loses monitoring on the running state of the system, and the metering and instrument loses monitoring on the running state of the system.
Disclosure of Invention
The application provides a voltage switching circuit at the low-voltage side of a voltage transformer, which aims to solve the problem that secondary equipment such as protection, metering and instrument devices and the like of the existing double-loop power supply system lose power when loop power supply switching is performed.
The technical scheme adopted for solving the technical problems is as follows: a voltage switching circuit for a low voltage side of a voltage transformer, comprising:
the high-voltage side of the first voltage transformer module is connected with one end of the circuit breaker QF1 and the output end of the first power supply equipment respectively;
the high-voltage side of the second voltage transformer module is connected with one end of the circuit breaker QF2 and the output end of the second power supply equipment respectively;
the voltage switching module comprises a first input end, a second input end and a first output end, wherein the first input end of the voltage switching module is connected with the low-voltage side of the first voltage transformer module, the second input end of the voltage switching module is connected with the low-voltage side of the second voltage transformer module, the first output end of the voltage switching module is connected with secondary equipment, and the voltage switching module can detect the opening and closing states of the circuit breaker QF1 and the circuit breaker QF2 and control the on-off state between the first input end of the voltage switching module and the first output end of the voltage switching module and the on-off state between the second input end of the voltage switching module and the first output end of the voltage switching module.
The voltage switching module comprises a first switch assembly, a second switch assembly and a low-voltage bus assembly, wherein the head end of the first switch assembly is connected with a first voltage transformer module, the tail end of the first switch assembly is connected with the low-voltage bus assembly and the head end of the second switch assembly respectively, the tail end of the second switch assembly is connected with the second voltage transformer module, the first switch assembly is interlocked with a breaker QF1, the on-off state of the first switch assembly is the same as the on-off state of the breaker QF1, the second switch assembly is interlocked with a breaker QF2, the on-off state of the second switch assembly is the same as the on-off state of the breaker QF2, and the low-voltage bus assembly is connected with secondary equipment.
The first voltage transformer module comprises a first single-phase voltage transformer and a second single-phase voltage transformer, and the first single-phase voltage transformer is connected with the second single-phase voltage transformer in a V/V connection way;
the second voltage transformer module comprises a third single-phase voltage transformer and a fourth single-phase voltage transformer, and the third single-phase voltage transformer and the fourth single-phase voltage transformer are connected through a V/V connection method.
The voltage switching circuit of the low-voltage side of the voltage transformer further comprises:
a first detection part and a second detection part;
the first switch assembly comprises a first switch, a second switch and a third switch;
the second switch assembly comprises a fourth switch, a fifth switch and a sixth switch;
the first detection component can detect the opening and closing state of the breaker QF1 and control the simultaneous on-off of the first switch, the second switch and the third switch;
the second detection component can detect the opening and closing state of the breaker QF2 and control the simultaneous on-off of the fourth switch, the fifth switch and the sixth switch;
the low-voltage bus assembly comprises a first low-voltage bus, a second low-voltage bus and a third low-voltage bus, and the first low-voltage bus, the second low-voltage bus and the third low-voltage bus are connected with secondary equipment;
one end of the high-voltage side of the first single-phase voltage transformer is connected with an A phase of a three-phase power supply, the other end of the high-voltage side of the first single-phase voltage transformer is connected with one end of the high-voltage side of the second single-phase voltage transformer and a B phase of the three-phase power supply respectively, the other end of the high-voltage side of the second single-phase voltage transformer is connected with a C phase of the three-phase power supply, one end of the low-voltage side of the first single-phase voltage transformer is connected with the head end of the first switch, the other end of the low-voltage side of the first single-phase voltage transformer is connected with the ground end, one end of the low-voltage side of the second single-phase voltage transformer and the head end of the second switch respectively, and the other end of the low-voltage side of the second single-phase voltage transformer is connected with the head end of the third switch;
one end of the high-voltage side of the third single-phase voltage transformer is connected with an A phase of a three-phase power supply, the other end of the high-voltage side of the third single-phase voltage transformer is respectively connected with one end of the high-voltage side of the fourth single-phase voltage transformer and a B phase of the three-phase power supply, the other end of the high-voltage side of the fourth single-phase voltage transformer is connected with a C phase of the three-phase power supply, one end of the low-voltage side of the third single-phase voltage transformer is connected with the head end of the fourth switch, and the other end of the low-voltage side of the third single-phase voltage transformer is respectively connected with the grounding end, one end of the low-voltage side of the fourth single-phase voltage transformer and the head end of the fifth switch;
the tail end of the first switch is connected with the tail end of the fourth switch and the first low-voltage bus respectively; the tail end of the second switch is connected with the tail end of the fifth switch and the second low-voltage bus respectively; the tail end of the third switch is connected with the tail end of the sixth switch and the third low-voltage bus respectively.
The voltage switching circuit of the low-voltage side of the voltage transformer further comprises a first protection component and a second protection component, one end of the first protection component is connected with the low-voltage side of the first voltage transformer module, the other end of the first protection component is connected with the first input end of the voltage switching module, one end of the second protection component is connected with the low-voltage side of the second voltage transformer module, and the other end of the second protection component is connected with the second input end of the voltage switching module.
The first voltage transformer module comprises a first three-phase voltage transformer, the high-voltage side of the first three-phase voltage transformer is connected with the output end of the first power supply equipment, and the low-voltage side of the first three-phase voltage transformer is connected with the first input end of the voltage switching module;
the second voltage transformer module comprises a second three-phase voltage transformer, the high-voltage side of the second three-phase voltage transformer is connected with the output end of the second power supply equipment, and the low-voltage side of the second three-phase voltage transformer is connected with the second input end of the voltage switching module.
A power distribution system, further comprising:
a first power supply device;
the circuit breaker QF1, the high voltage side of the first voltage transformer module in the voltage switching circuit of the low voltage side of the voltage transformer is respectively connected with one end of the circuit breaker QF1 and the output end of the first power supply equipment;
the other end of the breaker QF1 is connected with the high-voltage bus;
a breaker QF2, wherein one end of the breaker QF2 is connected with the high-voltage bus, the breaker QF2 and the breaker QF1 are interlocked with each other so that one and only one of the breaker QF2 and the breaker QF1 is closed, and the other is opened;
and the output end of the second power supply equipment is connected with the other end of the circuit breaker QF2 and the high voltage side of a second voltage transformer module in the voltage switching circuit of the low voltage side of the voltage transformer respectively.
The power distribution system further comprises:
the first interlocking module comprises a first closing command switch, a seventh switch and a breaker QF1 closing coil HQ1, one end of the first closing command switch is connected with one end of an external power supply, the other end of the first closing command switch is connected with the head end of the seventh switch, the tail end of the seventh switch is connected with one end of the breaker QF1 closing coil HQ1, and the other end of the breaker QF1 closing coil HQ1 is connected with the other end of the external power supply;
the second interlocking module comprises a second closing command switch, an eighth switch and a breaker QF2 closing coil HQ2, one end of the second closing command switch is connected with one end of an external power supply, the other end of the second closing command switch is connected with the head end of the eighth switch, the tail end of the eighth switch is connected with one end of the breaker QF2 closing coil HQ2, and the other end of the breaker QF2 closing coil HQ2 is connected with the other end of the external power supply;
the first closing command switch and the second closing command switch can receive external closing commands;
the seventh switch is opposite to the opening and closing state of the breaker QF2, and the eighth switch is opposite to the opening and closing state of the breaker QF 1.
The beneficial effects of the application are as follows: the technical scheme includes that the high-voltage side of first voltage transformer module, second voltage transformer module and voltage switching module, first voltage transformer module's high-voltage side is connected with circuit breaker QF 1's one end and first power supply unit's output respectively, and second voltage transformer module's high-voltage side is connected with circuit breaker QF 2's one end and second power supply unit's output respectively, and voltage switching module includes first input, second input and first output, voltage switching module's first input is connected with first voltage transformer module's low-voltage side, voltage switching module's second input is connected with second voltage transformer module's low-voltage side, voltage switching module's first output and secondary equipment are connected, voltage switching module can detect the break-make state of circuit breaker QF1 and circuit breaker QF2 and control voltage switching module's first input and voltage switching module's second input and voltage switching module's first output, thereby can continuously carry out the power supply loop when the second power supply unit is connected with the second output of voltage switching module, can reach the purpose of continuous power supply loop when two times of switching.
Drawings
The application is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a primary wiring diagram of the present application;
FIG. 2 is a circuit diagram of a first interlock module and a second interlock module of the present application;
fig. 3 is a circuit diagram of the voltage switching module of the present application.
Detailed Description
Referring to fig. 1 to 3, the present application is a voltage switching circuit for a low voltage side of a voltage transformer, comprising:
a first voltage transformer module 1, wherein the high voltage side of the first voltage transformer module 1 is respectively connected with one end of a circuit breaker QF1 and the output end of a first power supply device 51;
a second voltage transformer module 2, the high voltage side of the second voltage transformer module 2 is connected with one end of the circuit breaker QF2 and the output end of the second power supply equipment 52 respectively;
the voltage switching module 3, the voltage switching module 3 includes first input, second input and first output, the first input of voltage switching module 3 is connected with the low voltage side of first voltage transformer module 1, the second input of voltage switching module 3 is connected with the low voltage side of second voltage transformer module 2, the first output of voltage switching module 3 is connected with secondary equipment, voltage switching module 3 can detect the on-off state of circuit breaker QF1 and circuit breaker QF2 and control the break-make between the first input of voltage switching module 3 and the first output of voltage switching module 3 and the break-make of the second input of voltage switching module 3 and the first output of voltage switching module 3.
The first voltage transformer module 1 and the second voltage transformer module 2 are connected through the voltage switching module 3, so that power is not lost when the power supply of the secondary equipment is switched.
The voltage switching module 3 comprises a first switch assembly, a second switch assembly and a low-voltage bus assembly, wherein the head end of the first switch assembly is connected with the first voltage transformer module 1, the tail end of the first switch assembly is connected with the low-voltage bus assembly and the head end of the second switch assembly respectively, the tail end of the second switch assembly is connected with the second voltage transformer module 2, the first switch assembly is interlocked with the circuit breaker QF1, the on-off state of the first switch assembly is the same as the on-off state of the circuit breaker QF1, the second switch assembly is interlocked with the circuit breaker QF2, the on-off state of the second switch assembly is the same as the on-off state of the circuit breaker QF2, and the low-voltage bus assembly is connected with secondary equipment.
After the first switch component is interlocked with the breaker QF1, the first switch component can be opened when the breaker QF1 is opened, and the first switch component is closed when the breaker QF1 is closed; the second switch assembly is interlocked with the breaker QF2, so that the second switch assembly is opened when the breaker QF2 is opened, and the first switch assembly is closed when the breaker QF2 is closed, thereby realizing the switching of the power supplies of the first voltage transformer module 1 and the second voltage transformer module 2.
The first voltage transformer module 1 comprises a first single-phase voltage transformer 11 and a second single-phase voltage transformer 12, and the first single-phase voltage transformer 11 and the second single-phase voltage transformer 12 are connected by a V/V connection method;
the second voltage transformer module 2 comprises a third single-phase voltage transformer 21 and a fourth single-phase voltage transformer 22, and the third single-phase voltage transformer 21 and the fourth single-phase voltage transformer 22 are connected by a V/V connection method.
The double-loop system related in the application is suitable for a 6-10KV power distribution system, so that two three-phase voltage transformers can be directly adopted, but the three-phase voltage transformers are more expensive, have complex structures, high maintenance cost and lower market popularization, and the double-single-phase voltage transformers are adopted to form a V/V connection method, so that the conversion of three-phase voltages can be realized.
The voltage switching circuit of the low-voltage side of the voltage transformer further comprises a first detection part 41 and a second detection part 42;
the first switch assembly comprises a first switch 31, a second switch 32 and a third switch 33;
the second switch assembly includes a fourth switch 34, a fifth switch 35, and a sixth switch 36;
the first detecting part 41 can detect the opening and closing state of the circuit breaker QF1 and control the simultaneous opening and closing of the first switch 31, the second switch 32 and the third switch 33;
the second detecting part 42 can detect the opening and closing state of the circuit breaker QF2 and control the simultaneous opening and closing of the fourth switch 34, the fifth switch 35 and the sixth switch 36;
the low-voltage bus assembly comprises a first low-voltage bus 43, a second low-voltage bus 44 and a third low-voltage bus 45, and the first low-voltage bus 43, the second low-voltage bus 44 and the third low-voltage bus 45 are connected with secondary equipment;
one end of the high-voltage side of the first single-phase voltage transformer 11 is connected with an A of a three-phase power supply, the other end of the high-voltage side of the first single-phase voltage transformer 11 is respectively connected with one end of the high-voltage side of the second single-phase voltage transformer 12 and a B of the three-phase power supply, the other end of the high-voltage side of the second single-phase voltage transformer 12 is connected with a C of the three-phase power supply, one end of the low-voltage side of the first single-phase voltage transformer 11 is connected with the head end of the first switch 31, the other end of the low-voltage side of the first single-phase voltage transformer 11 is respectively connected with a grounding end, one end of the low-voltage side of the second single-phase voltage transformer 12 and the head end of the second switch 32, and the other end of the low-voltage side of the second single-phase voltage transformer 12 is connected with the head end of the third switch 33;
one end of the high-voltage side of the third single-phase voltage transformer 21 is connected with an A phase of a three-phase power supply, the other end of the high-voltage side of the third single-phase voltage transformer 21 is respectively connected with one end of the high-voltage side of the fourth single-phase voltage transformer 22 and a B phase of the three-phase power supply, the other end of the high-voltage side of the fourth single-phase voltage transformer 22 is connected with a C phase of the three-phase power supply, one end of the low-voltage side of the third single-phase voltage transformer is connected with the head end of the fourth switch 34, the other end of the low-voltage side of the third single-phase voltage transformer 21 is respectively connected with a grounding end, one end of the low-voltage side of the fourth single-phase voltage transformer 22 and the head end of the fifth switch 35, and the other end of the low-voltage side of the fourth single-phase voltage transformer 22 is connected with the head end of the sixth switch 36;
the tail end of the first switch 31 is connected with the tail end of the fourth switch 34 and the first low-voltage bus 43 respectively; the tail end of the second switch 32 is connected with the tail end of the fifth switch 35 and the second low-voltage bus 44 respectively; the tail end of the third switch 33 is connected to the tail end of the sixth switch 36 and the third low-voltage bus 45, respectively.
The first detecting component 41 detects the opening and closing state of the circuit breaker QF1, and controls the simultaneous actions of the first switch 31, the second switch 32 and the third switch 33 according to the detection result, when the dual-loop power distribution system is powered by the loop where the circuit breaker QF1 is located, if the loop fails and the power failure occurs, the circuit breaker QF1 trips, the first switch 31, the second switch 32 and the third switch 33 are simultaneously opened, the first voltage transformer module 1 is disconnected from the voltage switching module 3, and because the circuit breaker QF1 and the circuit breaker QF2 are in an interlocking state, the circuit breaker QF2 is closed when the circuit breaker QF1 is opened, the second detecting component 42 detects the closing of the circuit breaker QF2, and then controls the fourth switch 34, the fifth switch 35 and the sixth switch 36 to be simultaneously closed, the second voltage transformer module 2 is connected to the voltage switching module 3 to supply power for the low-voltage bus assembly, and the low-voltage bus supplies power for the secondary equipment.
The voltage switching circuit of the low voltage side of the voltage transformer further comprises a first protection component 71 and a second protection component 72, one end of the first protection component 71 is connected with the low voltage side of the first voltage transformer module 1, the other end of the first protection component 71 is connected with the first input end of the voltage switching module 3, one end of the second protection component 72 is connected with the low voltage side of the second voltage transformer module 2, and the other end of the second protection component 72 is connected with the second input end of the voltage switching module 3.
The first protection component 71 includes a first circuit breaker ZK1 disposed between the first switch 31 and one end of the low voltage side of the first single-phase voltage transformer 11, a second circuit breaker ZK2 disposed between the second switch 32 and the other end of the low voltage side of the first single-phase voltage transformer 11, and a third circuit breaker ZK3 disposed between the third switch 33 and the other end of the low voltage side of the second single-phase voltage transformer 12.
The second protection component 72 includes a fourth circuit breaker ZK4 disposed between the fourth switch 34 and one end of the low voltage side of the third single-phase voltage transformer 13, a fifth circuit breaker ZK5 disposed between the fifth switch 35 and the other end of the low voltage side of the third single-phase voltage transformer 13, and a sixth circuit breaker ZK6 disposed between the sixth switch 36 and the other end of the low voltage side of the fourth single-phase voltage transformer 14.
The first and second protection components 71, 72 function as arc extinction protection in the circuit.
The first voltage transformer module 1 comprises a first three-phase voltage transformer, the high-voltage side of the first three-phase voltage transformer is connected with the output end of the first power supply equipment 51, and the low-voltage side of the first three-phase voltage transformer is connected with the first input end of the voltage switching module 3;
the second voltage transformer module 2 comprises a second three-phase voltage transformer, the high-voltage side of the second three-phase voltage transformer is connected with the output end of the second power supply equipment 52, and the low-voltage side of the second three-phase voltage transformer is connected with the second input end of the voltage switching module 3.
The use of a three-phase voltage transformer also enables three-phase voltage conversion from the first power supply device and the second power supply device to the secondary device.
A power distribution system, further comprising:
a first power supply device 51;
the circuit breaker QF1, the high voltage side of the first voltage transformer module 1 in the voltage switching circuit of the low voltage side of the voltage transformer is respectively connected with one end of the circuit breaker QF1 and the output end of the first power supply equipment 51;
a high-voltage bus 6, wherein the other end of the breaker QF1 is connected with the high-voltage bus 6;
a breaker QF2, one end of the breaker QF2 is connected with the high-voltage bus 6, the breaker QF2 and the breaker QF1 are interlocked with each other so that one and only one of the breaker QF2 and the breaker QF1 is closed, and the other is opened;
and a second power supply device 52, wherein an output end of the second power supply device 52 is respectively connected with the other end of the circuit breaker QF2 and the high voltage side of the second voltage transformer module 2 in the voltage switching circuit of the low voltage side of the voltage transformer.
The power distribution system further comprises:
the first interlocking module 7, the first interlocking module 7 includes a first closing command switch 91, a seventh switch 37 and a breaker QF1 closing coil HQ1, one end of the first closing command switch 91 is connected with one end of an external power supply, the other end of the first closing command switch 91 is connected with the head end of the seventh switch 37, the tail end of the seventh switch 37 is connected with one end of the breaker QF1 closing coil HQ1, and the other end of the breaker QF1 closing coil HQ1 is connected with the other end of the external power supply;
the second interlock module 8, the second interlock module 8 includes a second closing command switch 92, an eighth switch 38, and a breaker QF2 closing coil HQ2, one end of the second closing command switch 92 is connected to one end of the external power source, the other end of the second closing command switch 92 is connected to the head end of the eighth switch 38, the tail end of the eighth switch 38 is connected to one end of the breaker QF2 closing coil HQ2, and the other end of the breaker QF2 closing coil HQ2 is connected to the other end of the external power source;
the first closing command switch 91 and the second closing command switch 92 can receive an external closing command;
the seventh switch 37 is opposite to the opening/closing state of the breaker QF2, and the eighth switch 38 is opposite to the opening/closing state of the breaker QF 1.
When the first closing command switch 91 and the second closing command switch 92 receive a closing command from the outside and the power distribution system is powered by a loop where the circuit breaker QF2 is located, if the second power supply equipment 52 fails and is powered off, the second closing command switch 92 is opened, the circuit breaker QF2 trips, the seventh switch 37 is closed, the first closing command switch 91 is closed, the closing coil HQ1 of the circuit breaker QF1 is powered on, and the circuit breaker QF1 is closed; when the power distribution system is powered by a loop where the breaker QF1 is located, if the first power supply equipment 51 fails to cause power failure, the first closing command switch 91 is opened, the breaker QF1 trips, the eighth switch 38 is closed, the second closing command switch 92 is closed, the closing coil HQ2 of the breaker QF2 is powered on, and the breaker QF2 is closed, so that the interlocking of the breaker QF1 and the breaker QF2 is realized, and the external closing command can enable a manual closing command or an automatic closing command.
The above examples are only preferred embodiments of the application, and other embodiments of the application are possible. Equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the application, and these equivalent modifications or substitutions are intended to be included within the scope of the present application as set forth in the following claims.
Claims (5)
1. A voltage switching circuit for a low voltage side of a voltage transformer, comprising:
the high-voltage side of the first voltage transformer module (1) is connected with one end of the circuit breaker QF1 and the output end of the first power supply equipment (51) respectively;
the high-voltage side of the second voltage transformer module (2) is respectively connected with one end of the circuit breaker QF2 and the output end of the second power supply equipment (52); the voltage switching module (3), the voltage switching module (3) comprises a first input end, a second input end and a first output end, the first input end of the voltage switching module (3) is connected with the low-voltage side of the first voltage transformer module (1), the second input end of the voltage switching module (3) is connected with the low-voltage side of the second voltage transformer module (2), the first output end of the voltage switching module (3) is connected with secondary equipment, and the voltage switching module (3) can detect the opening and closing states of the circuit breaker QF1 and the circuit breaker QF2 and control the on-off between the first input end of the voltage switching module (3) and the first output end of the voltage switching module (3) and the on-off between the second input end of the voltage switching module (3) and the first output end of the voltage switching module (3);
the voltage switching module (3) comprises a first switch assembly, a second switch assembly and a low-voltage bus assembly, wherein the head end of the first switch assembly is connected with the first voltage transformer module (1), the tail end of the first switch assembly is respectively connected with the low-voltage bus assembly and the head end of the second switch assembly, the tail end of the second switch assembly is connected with the second voltage transformer module (2), the first switch assembly is interlocked with the circuit breaker QF1, the on-off state of the first switch assembly is the same as the on-off state of the circuit breaker QF1, the second switch assembly is interlocked with the circuit breaker QF2, the on-off state of the second switch assembly is the same as the on-off state of the circuit breaker QF2, and the low-voltage bus assembly is connected with secondary equipment;
the first voltage transformer module (1) comprises a first single-phase voltage transformer (11) and a second single-phase voltage transformer (12), and the first single-phase voltage transformer (11) and the second single-phase voltage transformer (12) are connected by a V/V connection method;
the second voltage transformer module (2) comprises a third single-phase voltage transformer (21) and a fourth single-phase voltage transformer (22), and the third single-phase voltage transformer (21) and the fourth single-phase voltage transformer (22) are connected by a V/V connection method;
also comprises a first detection component (41) and a second detection component (42);
the first switch assembly comprises a first switch (31), a second switch (32) and a third switch (33);
the second switch assembly comprises a fourth switch (34), a fifth switch (35) and a sixth switch (36);
the first detection component (41) can detect the opening and closing state of the breaker QF1 and control the simultaneous on-off of the first switch (31), the second switch (32) and the third switch (33);
the second detection component (42) can detect the opening and closing state of the breaker QF2 and control the simultaneous on-off of the fourth switch (34), the fifth switch (35) and the sixth switch (36);
the low-voltage bus assembly comprises a first low-voltage bus (43), a second low-voltage bus (44) and a third low-voltage bus (45), and the first low-voltage bus (43), the second low-voltage bus (44) and the third low-voltage bus (45) are connected with secondary equipment;
one end of the high-voltage side of the first single-phase voltage transformer (11) is connected with an A of a three-phase power supply, the other end of the high-voltage side of the first single-phase voltage transformer (11) is respectively connected with one end of the high-voltage side of the second single-phase voltage transformer (12) and a B of the three-phase power supply, the other end of the high-voltage side of the second single-phase voltage transformer (12) is connected with a C of the three-phase power supply, one end of the low-voltage side of the first single-phase voltage transformer (11) is connected with the head end of the first switch (31), the other end of the low-voltage side of the first single-phase voltage transformer (11) is respectively connected with a grounding end, one end of the low-voltage side of the second single-phase voltage transformer (12) and the head end of the second switch (32), and the other end of the low-voltage side of the second single-phase voltage transformer (12) is connected with the head end of the third switch (33);
one end of the high-voltage side of the third single-phase voltage transformer (21) is connected with an A of a three-phase power supply, the other end of the high-voltage side of the third single-phase voltage transformer (21) is respectively connected with one end of the high-voltage side of the fourth single-phase voltage transformer (22) and a B of the three-phase power supply, the other end of the high-voltage side of the fourth single-phase voltage transformer (22) is connected with a C of the three-phase power supply, one end of the low-voltage side of the third single-phase voltage transformer is connected with the head end of the fourth switch (34), the other end of the low-voltage side of the third single-phase voltage transformer (21) is respectively connected with a grounding end, one end of the low-voltage side of the fourth single-phase voltage transformer (22) and the head end of the fifth switch (35), and the other end of the low-voltage side of the fourth single-phase voltage transformer (22) is connected with the head end of the sixth switch (36);
the tail end of the first switch (31) is connected with the tail end of the fourth switch (34) and the first low-voltage bus (43) respectively; the tail end of the second switch (32) is connected with the tail end of the fifth switch (35) and the second low-voltage bus (44) respectively; the tail end of the third switch (33) is connected with the tail end of the sixth switch (36) and the third low-voltage bus (45) respectively.
2. The voltage switching circuit of claim 1, wherein: the voltage transformer module further comprises a first protection component (71) and a second protection component (72), wherein one end of the first protection component (71) is connected with the low-voltage side of the first voltage transformer module (1), the other end of the first protection component (71) is connected with the first input end of the voltage switching module (3), one end of the second protection component (72) is connected with the low-voltage side of the second voltage transformer module (2), and the other end of the second protection component (72) is connected with the second input end of the voltage switching module (3).
3. The voltage switching circuit of claim 1, wherein:
the first voltage transformer module (1) comprises a first three-phase voltage transformer, the high-voltage side of the first three-phase voltage transformer is connected with the output end of the first power supply equipment (51), and the low-voltage side of the first three-phase voltage transformer is connected with the first input end of the voltage switching module (3);
the second voltage transformer module (2) comprises a second three-phase voltage transformer, the high-voltage side of the second three-phase voltage transformer is connected with the output end of the second power supply equipment (52), and the low-voltage side of the second three-phase voltage transformer is connected with the second input end of the voltage switching module (3).
4. A power distribution system, characterized by being applied to a voltage switching circuit of a low-voltage side of a voltage transformer according to any one of claims 1-3, further comprising:
a first power supply device (51);
the circuit breaker QF1, the high voltage side of a first voltage transformer module (1) in the voltage switching circuit of the low voltage side of the voltage transformer is respectively connected with one end of the circuit breaker QF1 and the output end of first power supply equipment (51);
a high-voltage bus (6), wherein the other end of the breaker QF1 is connected with the high-voltage bus (6);
a breaker QF2, one end of the breaker QF2 is connected with a high-voltage bus (6), the breaker QF2 and the breaker QF1 are interlocked with each other so that one and only one of the breaker QF2 and the breaker QF1 is closed, and the other is opened;
and the output end of the second power supply equipment (52) is respectively connected with the other end of the circuit breaker QF2 and the high voltage side of the second voltage transformer module (2) in the voltage switching circuit of the low voltage side of the voltage transformer.
5. The electrical distribution system of claim 4, further comprising:
the first interlocking module (7), the first interlocking module (7) comprises a first closing command switch (91), a seventh switch (37) and a breaker QF1 closing coil HQ1, one end of the first closing command switch (91) is connected with one end of an external power supply, the other end of the first closing command switch (91) is connected with the head end of the seventh switch (37), the tail end of the seventh switch (37) is connected with one end of the breaker QF1 closing coil HQ1, and the other end of the breaker QF1 closing coil HQ1 is connected with the other end of the external power supply;
the second interlocking module (8), the second interlocking module (8) comprises a second closing command switch (92), an eighth switch (38) and a breaker QF2 closing coil HQ2, one end of the second closing command switch (92) is connected with one end of an external power supply, the other end of the second closing command switch (92) is connected with the head end of the eighth switch (38), the tail end of the eighth switch (38) is connected with one end of the breaker QF2 closing coil HQ2, and the other end of the breaker QF2 closing coil HQ2 is connected with the other end of the external power supply;
the first closing command switch (91) and the second closing command switch (92) can receive external closing commands;
the seventh switch (37) is opposite to the opening and closing state of the breaker QF2, and the eighth switch (38) is opposite to the opening and closing state of the breaker QF 1.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201153219Y (en) * | 2007-12-29 | 2008-11-19 | 云南通变电器有限公司高低压成套设备厂 | Auto-switch-on ring network cabinet for PLC controlled double electricity supply |
| KR20120068260A (en) * | 2010-12-17 | 2012-06-27 | 현대중공업 주식회사 | Power auto trnasfer switch controller |
| CN102522809A (en) * | 2011-12-20 | 2012-06-27 | 浪潮(北京)电子信息产业有限公司 | System and method for achieving power redundancy |
| CN102790426A (en) * | 2012-06-29 | 2012-11-21 | 宝钢不锈钢有限公司 | Improved spare power source automatic switch method for single bus sectionalized operation of power substation |
| CN202663182U (en) * | 2012-01-09 | 2013-01-09 | 山东电力集团公司德州供电公司 | Power supply control system |
| CN203761134U (en) * | 2013-10-23 | 2014-08-06 | 武汉联动设计股份有限公司 | ATS-based dual power source station electricity consumption wire inlet screen for wind electric power generating field |
| CN106532922A (en) * | 2016-12-27 | 2017-03-22 | 池州学院 | Automatic input circuit for two-path three-phase power |
| CN208127986U (en) * | 2018-05-24 | 2018-11-20 | 山东铁雄冶金科技有限公司 | Gas-blowing engine power supply system |
-
2019
- 2019-01-24 CN CN201910071674.3A patent/CN109659938B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201153219Y (en) * | 2007-12-29 | 2008-11-19 | 云南通变电器有限公司高低压成套设备厂 | Auto-switch-on ring network cabinet for PLC controlled double electricity supply |
| KR20120068260A (en) * | 2010-12-17 | 2012-06-27 | 현대중공업 주식회사 | Power auto trnasfer switch controller |
| CN102522809A (en) * | 2011-12-20 | 2012-06-27 | 浪潮(北京)电子信息产业有限公司 | System and method for achieving power redundancy |
| CN202663182U (en) * | 2012-01-09 | 2013-01-09 | 山东电力集团公司德州供电公司 | Power supply control system |
| CN102790426A (en) * | 2012-06-29 | 2012-11-21 | 宝钢不锈钢有限公司 | Improved spare power source automatic switch method for single bus sectionalized operation of power substation |
| CN203761134U (en) * | 2013-10-23 | 2014-08-06 | 武汉联动设计股份有限公司 | ATS-based dual power source station electricity consumption wire inlet screen for wind electric power generating field |
| CN106532922A (en) * | 2016-12-27 | 2017-03-22 | 池州学院 | Automatic input circuit for two-path three-phase power |
| CN208127986U (en) * | 2018-05-24 | 2018-11-20 | 山东铁雄冶金科技有限公司 | Gas-blowing engine power supply system |
Non-Patent Citations (1)
| Title |
|---|
| 改两路高压由手动合闸切换兼自动合闸切换功能;王玉忠;;电气应用(第13期);40-43 * |
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