JPS61202409A - Shunt reactor - Google Patents

Abstract

PURPOSE:To switch a capacitance of a reactor by a switch of low cost by winding a secondary coil on an iron core of either of principal or auxiliary reactor part and shortening or releasing the secondary coil by a switch. CONSTITUTION:A principal reactor part 1 is composed of iron core legs 2-4 and principal coils 5-7. An auxiliary reactor part is composed of iron core legs 13-15 and auxiliary coils 16-18. Also secondary coils 25-27 are wound on the iron core legs 13-15. The ends of one side of the coils 25-27 are connected together and the ends of another side are connected together through auxiliary switches 20-22. As a voltage of the secondary coil can be selected arbitrarily, the low-cost switch can be used.

Description

[Detailed description of the invention] (Industrial application field) This invention relates to shunt reactors.

(Prior Art) As is well known, shunt reactors are widely used as a means for supplying delayed phase reactive power to a power system, for example, in order to suppress a voltage rise during light loads in the power system. In this case, depending on the degree of voltage rise in the system, it may be necessary to change the amount of delayed phase reactive power supplied, and therefore it is desirable to make the reactor capacity variable.

In order to satisfy such requirements, instead of preparing a plurality of shunt reactors, a configuration as shown in FIG. 3 has been separately proposed. In the figure, 1 is the main reactor section, and core legs 2 to 4.

It is composed of main coils 5 to 7 wound around each of the iron core legs 2 to 4. 8 is an upper yoke core, and 9 to 11 are main switching devices connected to each of the main coils 5 to 7.

Reference numeral 12 denotes an auxiliary reactor section, which includes core legs 13 to 15 and auxiliary coils 16 to 18 wound around each core leg 13 to 15.
It is composed of. 19 is the lower yoke core, 2
0-22 are auxiliary switching devices connected to auxiliary coils 16-18. Both reactor parts 1 and 12 are integrally constructed via an intermediate yoke core 23.

According to this configuration, when the main switching devices 9 to 11 and the auxiliary switching devices 20 to 22 are turned off, the capacity of the shunt reactor at that time is zero. Also, when the main switching devices 9 to 1 are turned on and the auxiliary switching devices 20 to 22 are turned off, only the main reactor section 1 is connected to the system and current flows. The capacity of the shunt reactor at this time is the same as the capacity of the main reactor section 1.

Further, when both the main and auxiliary switching devices are turned on, both the main and auxiliary reactor sections 1 and 12 are connected in parallel and connected to the system. The capacity of the shunt reactor at this time is the same as the sum of the capacities of the main and auxiliary reactor sections. In this way, the capacity can be switched by appropriately turning on and off both the main and auxiliary switching devices.

In this way, one shunt reactor can be used by switching the capacity, but on the other hand, as can be understood from the configuration of Figure 1, the auxiliary switchgear 2
22 are applied with the system voltage like the main switchgears 9 to 11, and therefore require a switchgear with the same rating as the main switchgear. In particular, the switchgear used when the system voltage is 66 KV or higher is large and expensive, and the installation space for the entire shunt reactor including the switchgear is large.

(Problems to be Solved by the Invention) The present invention provides a shunt reactor with switchable capacity.
The purpose is to downsize and lower the voltage of the switchgear for switching capacity.

(Means for Solving the Problems) This invention provides two iron core legs for either the main or auxiliary glue axle part.
Wind the secondary coil, connect the auxiliary switching device to this secondary coil, and turn on the auxiliary switching device.

It is characterized in that it is turned off to short-circuit and open the secondary coil, thereby switching the reactor capacity.

(Example) An example of the present invention will be described with reference to FIG. 1 and subsequent figures. Note that parts with the same reference numerals as those shown in FIG. 3 indicate the same or corresponding parts.

According to this invention, secondary coils 25 to 27 are wound around core legs 13 to 15 of either the main or auxiliary reactor section, in the example of FIG. 1, the auxiliary reactor section 12.

One end of each secondary coil 25-27 is connected together, and the other end is connected together via auxiliary switching devices 20-22.

The example shown in Figure 1 shows both the main and auxiliary coils 5-7, 16-18.
This is a configuration in which they are connected in series with each other.

In the above configuration, both opening/closing devices 9 to 11 and 20 to
22 are both off, the capacity of the five-shunt reactor is zero. Next, the main and auxiliary double doors.

When both closing devices are turned on, the secondary coils 25 to 27 are short-circuited, so the iron core legs 13 to 27 of the auxiliary reactor section 12 are
15 are canceled out, and therefore the capacity of the shunt reactor at this time is the same as the capacity of the main reactor section 1. The capacity at this time is defined as 100% capacity.

Furthermore, when the opening/closing devices 20 to 22 are turned off, the main.

Both auxiliary reactor sections 1 and 12 are connected in series to the grid. At this time, if the number of turns of the coils 16 to 18 of the reactor section 12 is approximately ε-1 times the number of turns of the coils 5 to 7,
At this time, the total number of turns of the glue handle is approximately F times that of 100% capacity.

On the other hand, since the power supply voltage is constant, the magnitude of the magnetic flux in the iron core is approximately 14 at 100% capacity.

At this time, the glue accelerator current generates a magnetic flux of 1/J with the number of turns of the pressure multiplier at 100% capacity, so it is 10
It becomes almost 1/2 of the 0% capacity. Therefore, the reactor capacity is approximately 1/2 of the capacity of the main reactor section 1.

In this way, the capacity can be switched by turning the switchgear on and off.

In the example shown in FIG. 2, the auxiliary coils 16 to 18 are connected to the main coil 5.
This configuration is connected in parallel to 7.

Here, when both the main and auxiliary switching devices are turned off, the capacity of the 1-shunt reactor is zero. Main opening/closing device 9-1
If only 1 is turned on, both main and auxiliary reactor parts 1
, 12 are connected in parallel to the system, the capacity of the shunt reactor at this time is the same as the sum of the capacities of the main reactor section 1 and the auxiliary reactor section 12.

If both the main and auxiliary opening/closing devices are turned on, the magnetic flux of the auxiliary reactor section 13 becomes zero, so the capacity of the adjustment axle at this time is the same as the capacity of the main reactor section 1. In this way, even in this case, the capacity can be switched by turning the switching device on and off.

In either case, the voltage of the secondary coils 25 to 27 can be arbitrarily selected depending on the winding ratio with respect to the coil wound around the core leg around which the secondary coil is wound. Therefore 2
As the auxiliary switchgear 20 to 22 connected to the next coil, any rated voltage lower than the system voltage can be used.

In the embodiment shown in FIG. 2, the secondary coils 25 to 27 are wound around the same core legs as the auxiliary coils 16 to 18, but instead, they are wound around the same core legs as the main coils 5 to 7. You can.

Note that the shunt reactor capacity is 50% when the auxiliary switching devices 20 to 22 are turned off, and 1.0% when the auxiliary switching devices 20 to 22 are turned on. O0
%, in the configuration shown in Figure 1 it is 100
The current corresponding to % capacity is the main.

Since the current flows throughout the auxiliary image coil, it is necessary to design both coils to be large enough to withstand this flow.

On the other hand, in the configuration shown in FIG. 2, 100% current flows only to the side where the secondary coil is not provided, so the other coil itself can be made smaller.

It is also advantageous because there is less loss.

(Effects of the Invention) As detailed above, according to the present invention, when a single accelerator is used by switching the capacity,
The voltage of the secondary coil used for switching can be selected to be any voltage lower than the grid voltage, so the auxiliary switchgear connected to it can also be selected with the most economical voltage rating. Therefore, the main auxiliary opening/closing device can be sufficiently miniaturized and inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a wiring diagram showing an embodiment of the present invention, FIG. 2 is a wiring diagram showing another embodiment of the invention, and FIG. 3 is a wiring diagram showing a previously proposed configuration. 1... Main reactor part, 2-4... Iron core leg, 5-7
...Main coil, 9-11...Main switchgear, 12...
・Auxiliary reactor part, 13~15... Iron core leg, 16~
18... Auxiliary coil section, 20-22... Auxiliary switchgear, 23... Intermediate yoke core, 25-27... Secondary coil,

Claims (1)

[Claims] A main reactor section including a main coil and an auxiliary reactor section including an auxiliary coil connected in series or parallel to the main reactor section are integrated via an intermediate yoke core, and A main switchgear is connected to connect this to the grid line, and a secondary coil is wound around the iron core leg around which the main or auxiliary coil is wound. The shunt reactor becomes a shunt reactor by connecting an auxiliary switchgear to short-circuit and open the reactor to switch the reactor capacity.