CN208045949U - A main wiring system of a high-voltage power distribution device - Google Patents

Abstract

The utility model provides a main wiring system of a high-voltage power distribution device, which comprises three sets of isolation circuit breakers, two sets of grounding switches and two sets of voltage transformers. One end of the first isolating circuit breaker is connected to No. The circuit breaker is connected to the No. 2 busbar. The output ends of the first voltage transformer and the second voltage transformer are respectively connected to the outlet loads. A detachable connection device is provided between the isolation circuit breaker and adjacent equipment. Compared with the existing power distribution device wiring system, the use of the isolation circuit breaker simplifies the wiring system and reduces the number of isolation switch power equipment in the wiring system. In the case of ensuring the good operation reliability of the power distribution device, the structure and wiring method of the power distribution device are simplified, the size of the power equipment is shortened, the occupied area and space are reduced, and the cost of power engineering is reduced.

Description

A main wiring system of a high-voltage power distribution device

technical field

The utility model relates to the technical field of power grid power distribution, in particular to a main wiring system of a high-voltage power distribution device.

Background technique

High-voltage power distribution devices refer to devices that play on-off, control or protection functions in power system generation, transmission, distribution, power conversion and consumption. They are mainly located in power stations and substations, and are important for the safe operation of power systems. Components occupy a very important position in the entire power industry.

The main wiring type of commonly used high-voltage power distribution devices often adopts the wiring mode of one and a half circuit breakers. 112), No. 1 bus side circuit breaker (113), No. 1 bus side current transformer (114), No. 1 bus side combination isolating switch (115), breaking circuit breaker (132), medium current transformer (131), No. 2 bus side combined isolating switch (125), No. 2 bus side current transformer (124), No. 2 bus side circuit breaker (123), No. 2 bus side isolating switch (122) is connected with No. 2 bus (121), A wiring method is formed in which every two outlet circuits share three circuit breakers. The current transformers are also respectively connected with outlet loads, and the outlet lines are respectively provided with an isolating switch (116) on the outlet side 1 side and an outlet side 2 side (126). It has the characteristics of high reliability, flexible operation scheduling, and convenient operation and maintenance.

However, the main wiring method of one and a half circuit breakers commonly used in power distribution devices involves more electrical equipment such as circuit breakers and isolating switches, which makes the structure and lead wires more complicated, occupies a large area, and requires high investment costs. In the case of the reliability of the main wiring method, reducing the occupied area has become an urgent problem to be solved.

Utility model content

The present application provides a main wiring system of a high-voltage power distribution device to solve the problems of complicated structures and lead wires and high investment costs in the one-and-a-half circuit breaker main wiring mode of common power distribution devices.

A main wiring system of a high-voltage power distribution device, including three sets of isolating circuit breakers, two sets of grounding switches, and two sets of voltage transformers;

One end of the first isolating circuit breaker is connected to No. The circuit breaker is connected to the No. 2 busbar;

The output ends of the first voltage transformer and the second voltage transformer are respectively connected to outlet loads;

A detachable connection device is provided between the isolating circuit breaker and adjacent equipment.

Optionally, the main wiring system of the high-voltage power distribution device further includes a first isolating switch and a second isolating switch;

The input end of the first isolating switch is connected to the No. 1 bus bar, and the output end is connected to the first isolating circuit breaker;

The input end of the second isolating switch is connected to the No. 2 busbar, and the output end is connected to the second isolating circuit breaker.

Optionally, the detachable connecting device includes reconnectable connecting fittings.

Optionally, a control device is provided inside the isolating circuit breaker.

Optionally, the control device includes an alarm unit.

The technical solution provided by the application includes the following beneficial technical effects:

This application provides a main wiring system of a high-voltage power distribution device. Compared with the existing one-and-a-half circuit breaker wiring system, the isolation function of the isolating switch is integrated into the circuit breaker, and the wiring system is simplified by using the isolating circuit breaker, reducing The number of power equipment such as isolating switches in the wiring system of the power distribution device is reduced, and the reliability of the power distribution device is improved at the same time. In the case of ensuring the good operation reliability of the power distribution device, the structure and wiring mode of the power distribution device are effectively simplified, the horizontal size of the substation is optimized, the occupied area and space are reduced, and the cost of power engineering is reduced.

Description of drawings

In order to illustrate the technical solution of the present application more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, on the premise of not paying creative labor, Additional drawings can also be derived from these drawings.

Fig. 1 is the schematic diagram of one and a half circuit breaker wiring systems in the existing distribution device that the utility model embodiment provides;

Fig. 2 is a schematic diagram of a main wiring system of a high-voltage power distribution device provided by an embodiment of the present invention.

Explanation of reference signs: 1. The first isolating circuit breaker, 11. The second isolating circuit breaker, 12. The second bus bar, 13. The second voltage transformer, 14. The second grounding switch, 15. The second isolating switch, 2 , No. 1 busbar, 21. Intermediate isolation circuit breaker, 3. The first voltage transformer, 4. The first grounding switch, 5. The first isolation switch, 6. Control device, 7. Alarm unit, 8. Detachable connection device , 111, No. 1 bus, 112, No. 1 bus side isolating switch, 113, No. 1 bus side circuit breaker, 114, No. 1 bus side current transformer, 115, No. 1 bus side combination isolating switch, 121, No. 2 bus , 122, No. 2 bus side isolating switch, 123, No. 2 bus side circuit breaker, 124, No. 2 bus side current transformer, 125, No. 2 bus side combined isolating switch, 131, medium current transformer, 132, open circuit device.

Detailed ways

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description serve to explain the principles of the application.

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, In other words, other drawings can also be obtained from these drawings without paying creative labor.

The embodiment of the utility model provides a main wiring system of a high-voltage power distribution device, which is mainly described in detail by using the wiring form of one and a half circuit breakers in a 330kV substation.

Please refer to accompanying drawing 2, which shows a schematic diagram of a main wiring system of a high-voltage power distribution device provided in this embodiment.

A main wiring system of a high-voltage power distribution device includes three sets of isolating circuit breakers, two sets of grounding switches and two sets of voltage transformers.

One end of the first isolating circuit breaker 1 is connected to the No. 1 bus bar 2, and the other end leads to wiring, which successively passes through the first voltage transformer 3, the first grounding switch 4, the intermediate isolating circuit breaker 21, the second grounding switch 14, and the second voltage The transformer 13 and the second isolating circuit breaker 11 are connected to the No. 2 bus 12 .

The output end of the No. 1 busbar 2 is connected to the input end of the first isolation circuit breaker 1, the output end of the first isolation short circuit breaker 1 is connected to the input end of the first voltage transformer 3, and part of the output end of the first voltage transformer 3 It is connected with the input end of the middle isolation circuit breaker 21. The output end of the second isolation circuit breaker 11 is connected with the input end of the second voltage transformer 31, and the output end part of the second voltage transformer 31 is connected with the input end of the middle isolation circuit breaker 21, and the output of the second isolation circuit breaker 11 The end is connected with No. 2 busbar 21.

A first grounding switch 4 is connected between the first voltage transformer 3 and the intermediate isolation circuit breaker 21 . A second grounding switch 14 is connected between the second voltage transformer 13 and the intermediate isolation circuit breaker 21 . The grounding switch is a mechanical switch used for the grounding part of the circuit. It can carry the current under abnormal conditions for a certain period of time. It can ground the equipment during the maintenance of high-voltage equipment and lines to protect personal safety.

The output ends of the first voltage transformer 3 and the second voltage transformer 13 are respectively connected to the outlet loads, and another part of the output ends of the first voltage transformer 3 and the second voltage transformer 13 is also connected to the outlet. The outlet end is connected to a load for power supply to meet the power supply demand.

The isolated circuit breaker integrates the isolation function with the circuit breaker, so there is no need to install two sets of equipment separately. Effectively reduce the occupied area, reduce power loss, improve the security of the power grid, and improve the reliability of the system. Compared with the existing power distribution wiring system, the isolation circuit breaker is used to configure the isolation switch at both ends of the original circuit breaker, and the isolation function of the isolation switch is integrated into the arc extinguishing chamber of the circuit breaker, and the distribution wiring The line is optimized, reducing the number of isolating switchgear used in the line, reducing the area occupied by the equipment and the space, and reducing the investment cost of the project. It should be noted that the isolation short circuit in this embodiment is integrated with the functional components of the current transformer, which has a high degree of safety and applicability.

A detachable connection device 8 is provided between the isolation circuit breaker and adjacent equipment. The detachable device acts as a disconnect switch in existing power distribution installations. The detachable connection device is provided between each isolating circuit breaker and adjacent equipment. When it is necessary to overhaul the isolating circuit breaker, pull the isolating circuit breaker, and stop the adjacent busbar or adjacent outgoing line. In the case of power failure, untie the detachable connection device 8, and then restore the power supply to the adjacent busbar or adjacent outgoing line. The isolating circuit breaker to be overhauled shall be overhauled safely within the scope of ensuring the safe distance for overhauling. At the same time, the detachable connection device is convenient for quick disassembly and installation during maintenance, which is beneficial to shorten the time required for maintenance and improve the efficiency of maintenance work.

In this embodiment, between the first isolation circuit breaker 1 and the first voltage transformer 3, between the second isolation circuit breaker 11 and the second voltage transformer 13, between the intermediate isolation circuit breaker 21 and the first grounding switch 4 The detachable connection devices are provided between the intermediate and intermediate isolation circuit breakers 21 and the second grounding switch 14 .

Compared with the main wiring system used in the existing power distribution device, the main wiring system of the power distribution device in the embodiment of the utility model uses an isolating circuit breaker, and cancels the isolating switch on the outgoing line side and the isolation on the bus side provided on the outgoing line end. The switch simplifies the wiring system, reduces the number of isolating switchgear used in the line system, optimizes the horizontal size of the substation, reduces the area occupied by power equipment, and also reduces the construction cost.

Apply the one-and-a-half circuit breaker wiring system of the common power distribution device and the wiring system provided in this embodiment to the 330kV substation system, and calculate and evaluate the reliability of its line operation:

According to the ABB survey of the maintenance time of isolation circuit breakers abroad, it takes about 2 hours for its maintenance. Due to the current domestic operation measures and practical habits, its maintenance time is more than 2 hours. Considering the extreme situation, the maintenance time is about 6 hours, according to Investigating the operation and maintenance of ABB's foreign isolation circuit breakers, and considering the above maintenance conditions, the calculation parameters of the isolation circuit breakers are as follows in Table 1:

Table 1 Reliability parameter table for calculation of 330kV isolation circuit breaker

Take the one-and-a-half circuit breaker wiring system commonly used in existing power distribution devices as scheme C, and take the wiring system in this embodiment that uses isolating circuit breakers and cancels the isolating switch on the outgoing line side and the isolating switch on the busbar side as scheme A, considering the isolation circuit breaker It takes 2 hours for the overhaul of the circuit breaker to be the plan A-1, and considering the 6 hours for the maintenance of the isolation circuit breaker is the plan A-2. The reliability of the wiring system after use is calculated, and the results are shown in Table 2:

Table 2 Reliability comparison of the wiring system with the bus-side switch and the outlet-side switch removed

It can be seen from Table 2 above that, compared with the existing power distribution device wiring system, the failure rate of the power distribution device wiring system provided by this embodiment is significantly reduced. Although the relative repair time has increased, the overall reliability is improved. It shows that the main wiring system of the high-voltage power distribution device provided by this embodiment cancels the isolating switch on the busbar side and the isolating switch on the outlet side. In the case of high power supply reliability, the structure and wiring mode of the power distribution device are simplified, the occupied area is reduced, and the cost of power engineering is reduced.

Optionally, the main wiring system of the high-voltage power distribution device further includes a first isolation switch 5 and a second isolation switch 15 . The input end of the first isolating switch 5 is connected to the No. 1 bus 2 , and the output end is connected to the first isolating circuit breaker 1 . The input end of the second isolating switch 15 is connected to the No. 2 bus 12 , and the output end is connected to the second isolating circuit breaker 11 . The first isolating switch 5 and the second isolating switch 15 are isolating switches arranged on both sides of the busbar, which can reduce the probability of busbar outage, reduce the failure rate, and effectively improve the reliability of power supply line operation.

Compared with the main wiring system used in the existing power distribution device, in the main wiring system of the power distribution device, only the outlet-side isolating switch set on the outlet end is canceled, which reduces the number of isolating switch equipment used in the line system. The system structure and wiring are simplified, which reduces the area occupied by power equipment and also reduces the construction cost.

Apply the common one and a half circuit breaker wiring system of power distribution equipment and the wiring system in which only the disconnecting switch on the outlet side is removed in this embodiment to the power supply of the 330kV substation line, and calculate and evaluate the line operation reliability:

Take the one-and-a-half circuit breaker wiring system commonly used in existing power distribution devices as scheme C, and take the wiring system in this embodiment that uses isolating circuit breakers and only cancels the isolating switch on the outlet side as scheme B, considering the time required for maintenance of the isolating circuit breaker 2 hours is the plan B-1, considering the maintenance time of the isolation circuit breaker is 6 hours is the plan B-2, according to the reliability parameter table calculated by the 330kV isolation circuit breaker in the above table 1, the reliability of the wiring system after use is carried out. Calculated, the results are shown in Table 3:

Table 3 Reliability comparison of the wiring system with only the switch on the outlet side removed

It can be seen from Table 3 above that, compared with the existing power distribution device wiring system, the failure rate of the power distribution device wiring system that only cancels the isolating switch on the wiring side is significantly reduced, and the average repair time is increased, but the overall reliability rate is improved. It shows that in this embodiment, only the main wiring system of the high-voltage power distribution device with the isolating switch on the outgoing line side is canceled, and the wiring system is simplified by using an isolating short-circuiter, which reduces the number of isolating switch devices in the system and ensures good power supply reliability. In this case, the structure and wiring method of the power distribution device are simplified, the occupied area is reduced, and the cost of power engineering is reduced.

Combining the above Tables 2 and 3, it can be seen that compared with the power distribution wiring system that cancels both the busbar side isolating switch and the outgoing line side isolating switch, the power distribution wiring system that only cancels the outgoing line side isolating switch has a lower failure rate and a higher failure rate. reliability, but they are all lower than the failure rate of the existing power distribution system, and have better reliability.

Optionally, the detachable connecting device 8 includes reconnectable connecting fittings. The connection fittings can be quickly untied and connected and can be reused, so as to reduce the time required for maintenance, quickly restore power supply, and improve power supply reliability. The type and structure of the connecting fittings are not limited in the present invention, specifically, those skilled in the art can choose according to the use environment. The connection fittings include compression type or bolt type equipment clamps for connecting equipment and soft wires, and the bolts between the equipment clamps and the equipment terminal board can be unfastened to realize quick release.

Optionally, a control device 6 is provided inside the isolation circuit breaker. The control device 6 is integrated into the isolation circuit breaker to realize local control, online detection, intelligent operation of a set of equipment and a cabinet, and further enhance the integration and intelligence level of switchgear. The overall equipment realizes integration and modularization, and has reliable compatibility.

Optionally, the control device 6 includes an alarm unit 7 . When the line fails, it can detect and warn the specific fault location, that is, the fault state, which is conducive to the accurate and rapid maintenance, improves the maintenance work efficiency, shortens the maintenance time, and improves the reliability of power supply.

This application provides a main wiring system of a high-voltage power distribution device. Compared with the existing one-and-a-half circuit breaker wiring system, the isolation function of the isolating switch, current transformers, intelligent components, etc. are integrated into the circuit breaker, and the isolating circuit breaker is used The wiring system is simplified, reducing the number of power equipment such as isolating switches in the wiring system of the power distribution device, and at the same time improving the reliability of the power distribution device. In the case of ensuring the good operation reliability of the power distribution device, the structure and wiring mode of the power distribution device are effectively simplified, the occupied area and space are reduced, and the cost of power engineering is reduced.

It should be noted that relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply a relationship between these entities or operations. There is no such actual relationship or order between them. Moreover, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that an article or device comprising a set of elements includes not only those elements but also other elements not expressly listed, Or also include elements inherent in such a process, method, article or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above descriptions are only specific implementation manners of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, the present application will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

It should be understood that the present application is not limited to what has been described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (5)

1. A main wiring system of a high-voltage power distribution device, characterized in that it comprises three groups of isolating circuit breakers, two groups of grounding switches and two groups of voltage transformers; One end of the first isolating circuit breaker (1) is connected to No. 1 busbar (2), and the other end leads to wiring, which passes through the first voltage transformer (3), the first grounding switch (4), and the intermediate isolating circuit breaker (21) in sequence. , the second grounding switch (14), the second voltage transformer (13) and the second isolating circuit breaker (11) are connected to the No. 2 busbar (12); The output ends of the first voltage transformer (3) and the second voltage transformer (13) are respectively connected to outlet loads; A detachable connection device (8) is provided between the isolating circuit breaker and adjacent equipment. 2. The main wiring system of the high-voltage power distribution device according to claim 1, characterized in that, the main wiring system of the high-voltage power distribution device further comprises a first isolating switch (5) and a second isolating switch (15); The input end of the first isolating switch (5) is connected to the No. 1 bus bar (2), and the output end is connected to the first isolating circuit breaker (1); The input end of the second isolating switch (15) is connected to the No. 2 busbar (12), and the output end is connected to the second isolating circuit breaker (11). 3. The main wiring system of the high-voltage power distribution device according to claim 1, characterized in that, the detachable connection device (8) includes reconnectable connection fittings. 4. The main wiring system of a high-voltage power distribution device according to claim 1, characterized in that a control device (6) is provided inside the isolating circuit breaker. 5. The main wiring system of a high-voltage power distribution device according to claim 4, characterized in that the control device (6) includes an alarm unit (7).