CN210577813U

CN210577813U - Quick voltage regulating device for 10KV line

Info

Publication number: CN210577813U
Application number: CN201922022484.0U
Authority: CN
Inventors: 孙换春; 齐良; 张宝
Original assignee: Yan'an Power Supply Branch Of Shaanxi Local Power Group Co ltd
Current assignee: Shaanxi Energy Research Institute Co Ltd
Priority date: 2019-11-21
Filing date: 2019-11-21
Publication date: 2020-05-19
Anticipated expiration: 2029-11-21

Abstract

The utility model discloses a rapid voltage regulation device for 10KV line, which comprises a combined transformer, an electronic on-load tapping system and a control and protection system; the combined transformer comprises a series transformer and an adjusting transformer with tap taps, the series transformer is connected in a line in series, the adjusting transformer is connected on an output line in parallel, the secondary side of the adjusting transformer is connected with the primary side of the series transformer, the secondary side of the series transformer is connected with the electronic on-load tap system, a control and protection system is respectively connected with one tap of the electronic on-load tap system and the primary side of the adjusting transformer, and other tap taps of the adjusting transformer are respectively connected with the electronic on-load tap system; the effect is as follows: the defects that the voltage regulating device in the prior art cannot frequently act and has low reaction speed are overcome, and meanwhile, the adopted electronic tap switch is contactless and does not draw an arc, so that the service life is long, the transformer oil does not need to be replaced, and the maintenance is avoided.

Description

Quick voltage regulating device for 10KV line

Technical Field

The utility model relates to a pressure regulating device technical field, concretely relates to quick pressure regulating device for 10KV circuit.

Background

Since the improvement of urban rural power networks, China does a lot of work on improving the voltage quality in the aspects of power distribution network construction and management, and the 'rural power supply' is basically realized. However, in many areas, especially in remote mountainous areas, the problem of "low voltage" is not fundamentally solved. In some areas, the problems of unreasonable power grid structure, thin wire section, long feeder line, large power supply radius, weak reactive power compensation capability and the like still exist. Especially, the power supply load of rural areas and urban and rural junctions varies greatly with seasons and day and night, so that the voltage is low under a heavy load, and the terminal voltage is raised when the load is light. These problems directly affect the output power and the power supply reliability of the power supply equipment, increase the line loss, and in severe cases, voltage collapse, frequency drop and large-area power failure occur, which become bottlenecks in improving the power supply quality in some areas, even in economic development, and must be effectively solved.

The current voltage regulation mode mainly comprises:

(1) and (5) building a new substation.

(2) The taps of the substation main transformer are adjusted to change the system voltage.

(3) Reactive power compensation equipment is reasonably configured in the system, and reactive power flow distribution of a power grid is improved.

(4) The line parameters are improved according to the voltage regulation requirements, and the section of the conducting wire is selected according to the allowable voltage loss.

(5) The number of conductors of the distribution line is increased to share the load.

(6) A mechanical on-load tap changer is used to regulate the transformer.

In the above measures, the newly built substation is expensive to manufacture. The tap joint for adjusting the main transformer takes the bus voltage of the transformer substation as a reference, the fluctuation of all lines cannot be ensured, and the safe operation of the main transformer is adversely affected by frequent adjustment. When a parallel capacitor is installed for reactive compensation, the voltage can be adjusted only in a small range, and for a light load line or when the reactive power is sufficient, the voltage is raised too high after compensation, so that the line loss of a distribution transformer is increased, and the service life of the capacitor is reduced. The measures of adopting thick-section and large-capacity wires, increasing feeders to share load, building a new substation and the like have high cost. The purpose of stabilizing the line voltage is achieved by using a mechanical on-load tap-changer regulating transformer, and as the mechanical switch is adopted and a mechanical spring needs certain energy storage time, the gear shifting time is long, and generally about 12 seconds is needed for tapping and gear shifting once; in addition, since the mechanical tap changer is not suitable for frequent actions, regular maintenance and repair are required after a certain period of operation, and meanwhile, the service life is limited, which causes inconvenience to users. In some application occasions, due to severe voltage change or strict requirements of users on the stability time of voltage quality, the response speed of the regulating transformer adopting the mechanical on-load tap-changer type can not meet the requirements of the users obviously.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a quick regulator for 10KV circuit to overcome the unable frequent action of current regulator, defect that reaction rate is slow.

The utility model discloses the technical scheme who takes does: a rapid voltage regulation device for a 10KV line comprises a combined transformer, an electronic on-load tapping system and a control and protection system;

the combined transformer comprises a series transformer and an adjusting transformer with tap taps, the series transformer is connected in a line in series, the adjusting transformer is connected on an output line in parallel, the secondary side of the adjusting transformer is connected with the primary side of the series transformer, the secondary side of the series transformer is connected with the electronic on-load tap system, the control and protection system is respectively connected with the electronic on-load tap system and one tap of the primary side of the adjusting transformer, and other tap taps of the adjusting transformer are respectively connected with the electronic on-load tap system.

Preferably, the electronic on-load tap-changing system comprises a plurality of groups of thyristors which are arranged in anti-parallel, and each group of thyristors which are arranged in anti-parallel is respectively connected with the tap of the corresponding regulating transformer.

Preferably, the control and protection system comprises a controller, a trigger circuit and a synchronous circuit, the controller is respectively connected with the trigger circuit and the synchronous circuit, and the trigger circuit is further connected with a thyristor arranged in the on-load tap-changer system in an anti-parallel manner.

Preferably, the control and protection system further comprises a communication interface, and the communication interface is connected with a wireless communication module.

Preferably, the rapid voltage regulating device for the 10KV line further comprises a bypass switch, wherein one end of the bypass switch is connected with the input end of the line, and the other end of the bypass switch is connected with the output end of the line.

By adopting the technical scheme, the method has the following advantages: the utility model provides a quick voltage regulation device for 10KV circuit replaces mechanical on-load tap-changer to carry out the pressure regulating through the electronic on-load tap-changer, and the pressure regulating is fast, can step the pressure regulating, can not appear high voltage because of getting rid of the load;

the gears can be frequently switched, and the adopted electronic tap switch is contactless and does not draw an arc, so that the electronic tap switch can frequently act, has long service life, does not need to replace transformer oil and is free from maintenance;

the combined transformer structure is adopted, so that gear switching and a high-voltage line are completely isolated, the electronic tap switch works on a low-voltage side, and the voltage resistance problem of power electronic devices is solved.

Drawings

Fig. 1 is a schematic structural diagram of a fast voltage regulation device for a 10KV line provided in an embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments, which are used for illustrating the present invention but are not used for limiting the scope of the present invention.

Referring to fig. 1, the present embodiment provides a fast voltage regulating device for 10KV line, which includes a combined transformer, an electronic on-load tap system and a control and protection system;

the combined transformer comprises a series transformer and an adjusting transformer with tap taps, the series transformer is connected in a line in series, the adjusting transformer is connected on an output line in parallel, the secondary side of the adjusting transformer is connected with the primary side of the series transformer, the secondary side of the series transformer is connected with the electronic on-load tap system, the control and protection system is respectively connected with one tap of the electronic on-load tap system and the primary side of the adjusting transformer, and other tap taps of the adjusting transformer are respectively connected with the electronic on-load tap system; as can be seen from fig. 1, the number of tap-offs is multiple.

Specifically, the electronic on-load tap-changing system comprises a plurality of groups of thyristors which are arranged in anti-parallel, and each group of thyristors which are arranged in anti-parallel is respectively connected with corresponding tap taps of the regulating transformer;

the electronic on-load tap-changing system is used for switching a tap under the condition of load, connecting the secondary side of the regulating transformer with the primary side of the series transformer by controlling and connecting the corresponding thyristor, and compensating the input voltage by the voltage of the secondary side of the series transformer to keep the output voltage stable; the control and protection system collects input and output voltages, determines a target gear according to the deviation of the output voltages from the reference voltage, determines the trigger time of the thyristor according to the current signal, and finally sends a control instruction to trigger the corresponding thyristor by the control and protection system, so that the transformation ratio of the regulating transformer is changed, and the secondary side voltage of the regulating transformer is transmitted to the series transformer to achieve the purpose of stabilizing the output voltage.

Further, the control and protection system comprises a controller, a trigger circuit and a synchronous circuit, wherein the controller is respectively connected with the trigger circuit and the synchronous circuit, and the trigger circuit is also connected with thyristors which are arranged in the on-load tap-changer system in an anti-parallel mode. Namely, when the gears are switched, the trigger pulse of the anti-parallel thyristor for controlling the current gear must be stopped before the trigger pulse of the anti-parallel thyristor for controlling the target gear, so that the thyristor is naturally turned off when the current passes zero.

The protection functions in the control and protection system include: the protection functions are mature applications in the prior art, and it should be understood by those skilled in the art that the detailed description is omitted here.

Furthermore, the control and protection system further comprises a communication interface, and the communication interface is connected with a wireless communication module.

Specifically, the communication interface adopts an RS232 communication interface, the parameters of the controller are checked and modified within a certain distance by connecting the wireless communication module, and the wireless communication module adopts a GPRS module to realize remote monitoring, so that the control is more convenient.

Furthermore, the rapid voltage regulating device for the 10KV line further comprises a bypass switch, wherein one end of the bypass switch is connected with the input end of the line, and the other end of the bypass switch is connected with the output end of the line; therefore, when equipment fails or a line is overloaded, the bypass switch is automatically closed, so that power failure of a user due to the fault of the voltage regulator is avoided, and the safe operation of the voltage regulator is also ensured. Similarly, the device also comprises a service switch and a protection breaker, and the specific structure of the service switch and the protection breaker is shown in figure 1.

According to the scheme, the electronic on-load tap-changer replaces a mechanical on-load tap-changer to carry out voltage regulation, the voltage regulation speed is less than 100ms, the voltage can be regulated in a cross-gear mode, and high voltage cannot occur due to load shedding;

the combined transformer structure is adopted, so that gear switching and a high-voltage line are completely isolated, the electronic tap switch works on the low-voltage side, and the voltage resistance problem of power electronic devices is solved;

the bypass protection function is provided, and when equipment fails or a line is overloaded, the bypass switch is automatically closed, so that power failure of a user due to the fault of the voltage regulator is avoided, and the safe operation of the voltage regulator is also ensured;

the wireless communication module is provided with a communication interface, and parameters of the controller can be checked and modified within a certain distance from a mounting point through the wireless communication module, for example, remote monitoring can be realized through the GPRS wireless communication technology.

Finally, it should be noted that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention.

Claims

1. A rapid voltage regulation device for a 10KV line is characterized by comprising a combined transformer, an electronic on-load tap system and a control and protection system;

2. A rapid voltage regulation device according to claim 1 for a 10KV line, wherein the electronic on-load tap-changing system comprises a plurality of sets of thyristors arranged in anti-parallel, each set of thyristors arranged in anti-parallel being connected to a tap of the regulating transformer respectively.

3. The fast voltage regulation device for a 10KV line according to claim 2, wherein the control and protection system comprises a controller, a trigger circuit and a synchronous circuit, the controller is connected with the trigger circuit and the synchronous circuit respectively, and the trigger circuit is further connected with a thyristor arranged in inverse parallel in the on-load tap-changer system.

4. The fast voltage regulation device for a 10KV line according to claim 3, wherein the control and protection system further comprises a communication interface, and the communication interface is connected with a wireless communication module.

5. A rapid voltage regulation device for 10KV line according to any one of claims 1 to 4, further comprising a bypass switch, one end of which is connected to the input end of the line and the other end of which is connected to the output end of the line.