CN213185616U - Power distribution system - Google Patents

Abstract

The utility model relates to a supply distribution technical field, a distribution system is disclosed, this distribution system includes two way inlet wires as the power, two section at least first distribution generating lines, one section second distribution generating line and at least a set of transformer bank, every transformer bank of group includes first transformer and a second transformer with first distribution generating line one-to-one, first transformer in every transformer bank of group is connected through first circuit breaker one-to-one with first distribution generating line, the second transformer passes through the second circuit breaker with second distribution generating line and is connected, two way inlet wires pass through the third circuit breaker with two sections first distribution generating lines respectively and are connected, two section at least first distribution generating lines loop through the fourth circuit breaker and are connected, every section first distribution generating line all passes through the fifth circuit breaker with second distribution generating line and is connected. This distribution system can reduce the degree of difficulty of electric power system dispatch to reduce distribution equipment quantity, and then improve the operation flexibility, reduce distribution equipment setting and fortune dimension cost, effectively promote equipment utilization.

Description

Power distribution system

Technical Field

The utility model relates to a supply and distribution technical field, in particular to power distribution system.

Background

At present, the electrical load is large and the load level is high, for example, when the primary and secondary loads are in use, the power supply, the bus and the transformer of the power distribution system need to be configured redundantly according to the national design specification, and a standby power supply and a standby transformer are provided for the primary and secondary electrical loads. As shown in fig. 1 and 2, the most common 10(20) kV distribution system mostly uses 2 power incoming lines 01, and a single bus 02 is segmented (2 segments). Every 2 transformers 03 are in one group, the capacities are mutually redundant, and a low-voltage bus 04 is arranged on the low-voltage side for communication, so that a mutually standby system is achieved, and the power supply and distribution system is called as an N + N configuration. When the system runs normally, the load rate of each path and section of the bus 02 is about 50%, when 1 path or section of the bus 02 has a fault, the electric load on the fault side needs to be transferred to the other 1 path or section, and the load rate on the working side reaches 100%.

When the electrical load is large and the load level is high, for example, when the electrical load is a first-level load and a second-level load, when one section of 10(20) kV bus 02 has a fault, the electrical load of 1/2 is transferred to the other section of 10(20) kV bus, the load on the non-fault side increases steeply, and the scheduling difficulty of the power system is increased. Moreover, the capacities of the incoming cables, the bus interfaces and the distribution transformer need to be configured by N + N (2N), the capacity configuration of the power supply and distribution equipment is overlarge, and the number of 2N is very large.

Taking fig. 1 as an example, when a 20kV distribution system is adopted, 16 transformers with a capacity of 2000kVA are required to be arranged in normal operation, and 32 transformers with a capacity of 2000kVA are required to be configured to meet the load redundancy N + N (2N) requirements of the primary and secondary loads;

taking fig. 2 as an example, when a 10kV distribution system is adopted, 8 transformers with a capacity of 2000kVA are required to be arranged in normal operation, and 16 transformers with a capacity of 2000kVA are required to be arranged to meet the load redundancy N + N (2N) requirements of the primary and secondary loads; the capacity of the distribution transformer is 2 times that of the actual requirement.

SUMMERY OF THE UTILITY MODEL

The utility model provides a distribution system, above-mentioned distribution system can reduce the degree of difficulty of electric power system dispatch to a great extent reduces distribution equipment quantity, and then can improve the operation flexibility, reduces distribution equipment setting and fortune dimension cost, effectively promotes power consumption enterprise equipment utilization ratio, improves market competition.

In order to achieve the above purpose, the utility model provides the following technical scheme:

the utility model provides a power distribution system, includes two way inlet wires as the power, two section at least first distribution bus, one section second distribution bus and a set of at least transformer bank, every group the transformer bank include with first distribution bus one-to-one's first transformer and a second transformer, every group in the transformer bank first transformer with first distribution bus connects through first circuit breaker one-to-one, the second transformer with second distribution bus passes through the second circuit breaker and connects, two the inlet wire respectively with two sections first distribution bus passes through the third circuit breaker and connects, two sections at least first distribution bus loops through the fourth circuit breaker and connects, every section first distribution bus all with second distribution bus passes through the fifth circuit breaker and connects.

The distribution system comprises two incoming lines serving as a power supply, at least two sections of first distribution buses, one section of second distribution bus and at least one group of transformer banks, wherein the two incoming lines are respectively connected with the two sections of first distribution buses through third circuit breakers, the at least two sections of first distribution buses are sequentially connected through fourth circuit breakers, each section of first distribution bus is connected with the second distribution bus through a fifth circuit breaker, first transformers in each group of transformer banks are correspondingly connected with the first distribution buses one by one, second transformers are connected with the second distribution buses, when the distribution system operates normally, the first distribution buses supply power to the first transformers, the second distribution buses and the second transformers are in redundant configuration to provide standby buses and standby transformers for power loads, when one section of the first distribution buses is in fault, the first distribution buses can be stopped, and the first transformers connected with the fault buses are stopped from operating, any section of the first distribution buses except the first distribution bus with the fault is communicated with a standby second distribution bus, and a standby second transformer connected with the second distribution bus is put into operation to recover power supply. Among the above-mentioned distribution system, distribution bus sets for N +1 section (N is greater than or equal to 2), N section first distribution bus and 1 section second distribution bus promptly, when one of them section first distribution bus trouble, can shift 1/N's power consumption load to reserve second distribution bus, during the bus trouble, non-trouble first distribution bus load does not sharply increase, the degree of difficulty of electric power system dispatch has been reduced, and, transformer capacity also is N +1 configuration, promptly every transformer bank sets up N first transformer and 1 second transformer, under the prerequisite that satisfies the power consumption demand, to a great extent reduces distribution equipment quantity, and then can improve the operation flexibility, reduce distribution equipment setting and fortune dimension cost, effectively promote power consumption enterprise equipment utilization ratio, and the cost is reduced, and the market competition is improved.

Optionally, the power supply further comprises low-voltage buses corresponding to all the first transformers one by one and a plurality of feeders connected to each of the low-voltage buses, and the low-voltage buses are connected to the secondary sides of the corresponding first transformers through sixth breakers.

Optionally, the system further comprises low-voltage interconnection buses in one-to-one correspondence with the transformer banks, each section of the low-voltage interconnection bus is connected with the second transformer in the corresponding transformer bank through a seventh circuit breaker, and the low-voltage buses connected with all the first transformers in the corresponding transformer bank are connected through an eighth circuit breaker.

Optionally, the number of the first distribution busbars is 2 or more and 4 or less.

Optionally, the first distribution bus and the second distribution bus are 20kV buses.

Alternatively, when the number of the first distribution bus bars is 4, the number of the transformer banks is 4.

Optionally, the first distribution bus and the second distribution bus are 10kV buses.

Alternatively, when the number of the first distribution bus bars is 4, the number of the transformer banks is 2.

Optionally, the low voltage bus is a 0.4kV bus.

Optionally, the first and second transformers have a capacity of 2000 kVA.

Drawings

Fig. 1 is a schematic circuit diagram of a 20kV power distribution system in the prior art;

FIG. 2 is a schematic circuit diagram of a prior art 10kV power distribution system;

fig. 3 is a schematic circuit structure diagram of a 20kV power distribution system according to an embodiment of the present invention;

fig. 4 is a schematic circuit structure diagram of a 10kV power distribution system provided by an embodiment of the present invention.

Icon:

01-incoming line; 02-bus bar; 03-a transformer; 04-low voltage bus;

1-feeding wire; 2-a first distribution bus; 3-a second distribution bus; 41-a first transformer; 42-a second transformer; 51-a first circuit breaker; 52-a second circuit breaker; 53-third circuit breaker; 54-a fourth circuit breaker; 55-fifth circuit breaker; 56-sixth circuit breaker; 57-seventh circuit breaker; 58-eighth circuit breaker; 6-low voltage bus; 7-low voltage tie bus; 8-a feeder line.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Please refer to fig. 3 and 4, the utility model provides a power distribution system, including two way inlet wires 1 as the power, at least two sections first distribution generating line 2, one section second distribution generating line 3 and at least a set of transformer bank, every transformer bank of group includes first transformer 41 and a second transformer 42 with 2 one-to-one of first distribution generating line, first transformer 41 and first distribution generating line 2 in every transformer bank of group are connected through first circuit breaker 51 one-to-one, second transformer 42 passes through second circuit breaker 52 with second distribution generating line 3 and is connected, two way inlet wires 1 are connected through third circuit breaker 53 with two sections first distribution generating line 2 respectively, at least two sections first distribution generating line 2 loop through fourth circuit breaker 54 and are connected, every section first distribution generating line 2 all is connected through fifth circuit breaker 55 with second distribution generating line 3.

The embodiment of the utility model provides an in a distribution system, including two way inlet wires 1 as the power, at least two sections first distribution generating lines 2, one section second distribution generating line 3 and at least a set of transformer bank, two way inlet wires 1 are connected with two sections first distribution generating lines 2 respectively through third circuit breaker 53, at least two sections first distribution generating lines 2 loop through fourth circuit breaker 54 to be connected, each section first distribution generating line 2 all is connected with second distribution generating line 3 through fifth circuit breaker 55, first transformer 41 in each set of transformer bank is connected with first distribution generating line 2 one-to-one correspondence, second transformer 42 is connected with second distribution generating line 3, distribution system normal operating, first distribution generating line 2 supplies power for first transformer 41, second distribution generating line 3 and second transformer 42 are as redundant configuration, provide reserve generating line and reserve transformer for the power consumption load, when one section of the first distribution bus has a fault, the first distribution bus can be deactivated, the first transformer connected with the fault bus is out of operation, any section of the first distribution bus except the fault first distribution bus is connected with the standby second distribution bus 3, and the standby second transformer 42 connected with the second distribution bus 3 is put into operation to recover power supply. Among the above-mentioned distribution system, distribution bus sets for N +1 section (N is greater than or equal to 2), N section first distribution bus 2 and 1 section second distribution bus 3 promptly, when one of them section first distribution bus trouble, can shift 1/N's power consumption load to reserve second distribution bus 3, during the bus trouble, the first distribution bus load of non-trouble does not increase suddenly, the degree of difficulty of electric power system dispatch has been reduced, and, transformer capacity also is N +1 configuration, promptly every transformer bank sets up N first transformer 41 and 1 second transformer 42, under the prerequisite that satisfies the power consumption load demand, to a great extent reduces distribution equipment quantity, and then can improve the operation flexibility, reduce distribution equipment setting and fortune dimension cost, effectively promote power consumption enterprise equipment utilization rate, improve market competition.

In a specific embodiment, the power distribution system further includes low-voltage buses 6 corresponding to all the first transformers 41 in a one-to-one manner, and a plurality of feeders 8 connected to each low-voltage bus 6, the low-voltage buses 6 are connected to the secondary side of the corresponding first transformer 41 through sixth disconnectors 56, and the power distribution system supplies power to the corresponding low-voltage buses 6 through the first transformers 41.

In a specific embodiment, the power distribution system further includes low-voltage interconnection bars 7 corresponding to the transformer banks one by one, each low-voltage interconnection bar 7 is connected with the second transformer 42 in its corresponding transformer bank through a seventh breaker 57, and the low-voltage busbars 6 connected with all the first transformers 41 in its corresponding transformer bank are connected through an eighth breaker 58.

When one section of the first distribution bus bar has a fault, the first distribution bus bar is stopped, the first transformer connected with the fault bus bar is out of operation, any section of the first distribution bus bar except the fault first distribution bus bar is connected with the standby second distribution bus bar 3, the standby second transformer 42 connected with the second distribution bus bar 3 is put into operation, and power supply to the low-voltage bus bar 6 connected with the first transformer 41 out of operation is recovered through the low-voltage interconnection bus bar 7.

Or, when any first transformer 41 in one transformer group has a fault, the faulty first transformer 41 exits from operation, the second distribution bus 3 is connected with any first distribution bus 2, the second transformer 42 in the transformer group where the faulty first transformer 41 is located is put into operation, and the low-voltage bus 6 corresponding to the faulty transformer is supplied with power through the low-voltage interconnection bus 7 connected with the second transformer 42.

It should be noted that, in the above power distribution system, the circuit breaker can close, carry, and open/close the current under the normal loop condition, and the circuit breaker can automatically cut off the circuit when the line and the power distribution equipment are in fault, and the types or models of the circuit breakers at different junctions are selected according to the actual situation, and are not limited herein. For example, the third, fourth and fifth circuit breakers 53, 54 and 55 may be vacuum circuit breakers.

The embodiment of the utility model provides an among the distribution system, under the condition that satisfies the power consumption load demand, compare the distribution system among the prior art, can effectual reduction distribution equipment's quantity, distribution system's capacity is big more, the embodiment of the utility model provides an in the distribution system's advantage more obvious.

In one possible embodiment, the number of first distribution busbars 2 may be set to 2 or more and 4 or less. For example, the number of the first distribution buses can be set to 4, when one of the distribution buses has a fault, only 1/4 electric loads can be transferred to the second distribution bus, only 1/4 electric loads can be transferred, and the transfer capacity is reduced by 50% when the buses have faults, compared with the prior art, and the scheduling difficulty of the power system is reduced.

In particular embodiments, the power distribution system may be a 20kV power distribution system and a 10kV power distribution system. The low-voltage bus 6 is a 0.4kV bus. The capacity of the first transformer 41 and the second transformer 42 may be 2000 kVA.

Specifically, as shown in fig. 3, a 2-way incoming line 1 is adopted in a 20kV power distribution system, and the first power distribution bus 2 and the second power distribution bus 3 are 20kV buses. The number of the first distribution buses 2 can be set to 4, the second distribution bus 3 is one, and each section of the first distribution bus accounts for 1/4 of the total load, for example, the 4 sections of the first distribution buses in fig. 3 are bus I1, bus I2, bus II1 and bus II2, respectively, and the second distribution bus 3 is bus S. Specifically, in the 20kV distribution system, 16 transformers may need to be arranged for normal operation, when the number of the first distribution buses 2 is set to 4, since each group of transformer sets includes the first transformers connected to the first distribution buses in a one-to-one correspondence, each group of transformer sets includes 4 first transformers, and the number of the transformer sets is 4, for example, the 4 groups of transformer sets in fig. 3 are respectively the B group, the C group, the D group and the E group, that is, 16 first transformers 41 are configured for the 4 sections of the first distribution buses 2, each first distribution bus 2 is connected to 4 first transformers 41, for example, the 16 first transformers in fig. 3 are respectively the transformers TR-11B, the transformer TR-11C, the transformer TR-11D and the transformer TR-11E connected to the bus I1, the transformer TR-12B, the transformer TR-12C connected to the bus I2, and the transformer TR-11E, The transformer TR-12D, the transformer TR-12E, the transformer TR-22B, the transformer TR-22C, the transformer TR-22D and the transformer TR-22E which are connected with the bus II2, and the transformer TR-21B, the transformer TR-21C, the transformer TR-21D and the transformer TR-21E which are connected with the bus II 1. In order to meet the load redundancy requirements of the primary and secondary loads, each group of transformer banks has 1 second transformer, and 4 groups of transformer banks need to be configured with 4 second transformers, for example, in fig. 3, 4 second transformers are respectively a transformer TR-SB, a transformer TR-SC, a transformer TR-SD and a transformer TR-SE. In the above power distribution system, 20 transformers are required to be arranged in total. Compared with the power distribution system in the prior art, the capacity configuration of the power distribution equipment is reduced to a great extent, and the setting, operation and maintenance costs of the power distribution equipment are reduced.

In the 20kV power distribution system, if the bus I2 fails, the bus is deactivated, and the transformer TR-12B, the transformer TR-12C, the transformer TR-12D and the transformer TR-12E connected with the bus I2 are out of operation. The spare bus S can be connected with any section of the bus I1, the bus II1 and the meter line II2, a transformer TR-SB, a transformer TR-SC, a transformer TR-SD and a transformer TR-SE which are connected with the spare bus S are put into operation, and power supply of low-voltage buses corresponding to the transformer TR-12B, the transformer TR-12C, the transformer TR-12D and the transformer TR-12E is recovered through the low-voltage interconnection bus 7; if any one of the transformers TR-11B, the transformer TR-12B, the transformer TR-22B and the transformer TR-21B in the transformer bank B has a fault, the fault transformer quits operation, the standby bus S is connected with other buses, the transformer TR-SB is put into operation, and power is supplied to the low-voltage bus corresponding to the fault transformer through the low-voltage communication bus 7.

Specifically, as shown in fig. 4, a 2-way incoming line 1 is adopted in a 10kV power distribution system, and the first power distribution bus 2 and the second power distribution bus 3 are 10kV buses. The number of the first distribution buses 2 can be set to 4, the second distribution bus 3 is 1, each section of the first distribution bus 2 is 1/4 of the total load, for example, in fig. 4, the 4 sections of the first distribution buses are respectively a bus I1, a bus I2, a bus II1 and a bus II2, and the second distribution bus 3 is a bus S. Specifically, in a 10kV distribution system, when the first distribution bus 2 is set to 4 sections, since each section of transformer bank includes the first transformer connected to the first distribution bus in a one-to-one correspondence, each group of transformer banks includes 4 first transformers, and the number of transformer banks is 2, for example, 2 groups of transformer banks in fig. 4 are respectively B group and C group, that is, 4 sections of the first distribution bus 2 are provided with 8 first transformers 41, each first distribution bus 2 is connected to 2 first transformers 41, for example, 8 first transformers in fig. 4 are respectively a transformer TR-11B and a transformer TR-11C connected to a bus I1, a transformer TR-12B and a transformer TR-12C connected to a bus I2, a transformer TR-22B and a transformer TR-22C connected to a bus II2, and a transformer TR-21B and a transformer connected to a bus II1, And a transformer TR-21C. In order to meet the load redundancy requirement of the primary and secondary loads, 1 second transformer is provided in each transformer bank, and 2 second transformers are required to be configured in 2 transformer banks, for example, the 2 second transformers in fig. 4 are respectively a transformer TR-SB and a transformer TR-SC. The transformer in the power distribution system needs to be configured with 10 transformers totally, and the capacity of the distribution transformer is 1.2 times of the actual capacity, so that compared with the prior art, the power distribution system reduces the setting, operation and maintenance cost of power distribution equipment.

In the 10kV power distribution system, if the bus I2 fails, the bus is deactivated, and the transformer TR-12B and the transformer TR-12C connected with the bus I2 are out of operation. The spare bus S can be connected with any section of the bus I1, the bus II1 and the meter line II2, a transformer TR-SB and a transformer TR-SC connected with the spare bus S are put into operation, and power supply to low-voltage buses corresponding to the transformer TR-12B and the transformer TR-12C is recovered through the low-voltage interconnection bus 7; if any one of the transformers TR-11B, the transformer TR-12B, the transformer TR-22B and the transformer TR-21B in the transformer bank B has a fault, the fault transformer quits operation, the standby bus S is connected with other buses, the transformer TR-SB is put into operation, and power is supplied to the low-voltage bus corresponding to the fault transformer through the low-voltage communication bus 7.

It will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. The utility model provides a distribution system, its characterized in that includes two way inlet wires as the power, two section at least first distribution bus, one section second distribution bus and a set of at least transformer bank, every group the transformer bank include with first distribution bus one-to-one's first transformer and a second transformer, every group in the transformer bank first transformer with first distribution bus is connected through first circuit breaker one-to-one, the second transformer with second distribution bus passes through the second circuit breaker and connects, two the inlet wire respectively with two sections first distribution bus passes through the third circuit breaker and connects, two sections at least first distribution bus loops through the fourth circuit breaker and connects, every section first distribution bus all with second distribution bus passes through the fifth circuit breaker and connects.

2. The power distribution system of claim 1, further comprising a low voltage bus in one-to-one correspondence with all of the first transformers and a plurality of feeders connected to each of the low voltage buses, the low voltage buses being connected to the secondary side of their corresponding first transformers by a sixth circuit breaker.

3. The power distribution system of claim 2, further comprising low voltage interconnection bars in one-to-one correspondence with the transformer banks, each of the low voltage interconnection bars being connected to the second transformer of its corresponding transformer bank by a seventh circuit breaker and the low voltage bus bars connected to all the first transformers of its corresponding transformer bank being connected by an eighth circuit breaker.

4. The electrical distribution system of claim 1, wherein the number of first distribution busbars is 2 or more and 4 or less.

5. An electrical distribution system according to any of claims 1-4, wherein the first and second distribution busbars are 20kV busbars.

6. The power distribution system of claim 5, wherein when the number of first distribution busbars is 4, the number of transformer banks is 4.

7. An electrical distribution system according to any of claims 1-4, wherein the first and second distribution busbars are 10kV busbars.

8. The power distribution system of claim 7, wherein when the number of first distribution busbars is 4, the number of transformer banks is 2.

9. The power distribution system of claim 2, wherein the low voltage bus is a 0.4kV bus.

10. The power distribution system of claim 1, wherein the first and second transformers have a capacity of 2000 kVA.

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