JPH03226236A - Indoor-use high-voltage switchgear - Google Patents

Abstract

PURPOSE:To limit an isolated division due to failure and supply power continuously to a sound section upon failure by a method wherein load switches for trunk line, which can be controlled by remote control, are arranged at both ends of a branch point to use them as a branch switching unit. CONSTITUTION:A loop is switched at one end of an arbitrary branch point 11 by a load switch 8 for a trunk line 6 mounted on both ends of the branch point 11 of a branch switching unit 7. When a failure occurs at a point F1 in the main line 6, load switches 8c, 8d positioned at both ends of the trunk line are opened and all other load switches are closed whereby an open loop power distribution, in which power distribution to all branch circuits can be maintained, is obtained. When a failure occurs at the point F2 of a branch circuit, the load switches 8e, 8f belonging to a branch switching unit are opened and all other load switches are closed whereby the open loop power distribution, in which the power distribution to all branch circuits excluding the part of the failure can be maintained, is obtained.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a high-voltage switchgear for indoor use, which is used in a high-voltage loop power distribution system applied to power distribution equipment in relatively large buildings, factories, etc. be.

[Conventional technology] Low-voltage radial power distribution has traditionally been the most common power distribution method for relatively large buildings, factories, etc., but high-voltage loop power distribution has been applied due to improved power distribution efficiency and supply reliability due to increased capacity in recent years. is expanding.

Figure 5 shows Japanese Patent Application Laid-Open No. 56-1481 regarding high-voltage loop power distribution.
This is a system diagram showing the conventional power distribution system published in No. 35, in which (1) is a loop switch, (2) is a branch switch unit, (3) is a branch switch, and (4) is a low voltage distribution system. A distribution transformer, (5) a main circuit breaker for power distribution, and (6) a main line for power distribution.

Next, the operation of the high voltage loop power distribution system configured by these devices will be explained.

In the high-voltage loop power distribution, power is supplied to distributed loads via a power distribution main circuit breaker (5) and a power distribution main line (6) connected in a loop.

In addition, the distribution line configured in this way is equipped with a loop switch (1
), and the open-loop distribution method is used when the circuit is always open, and the closed-loop distribution method is used when the circuit is always closed.

Since power cables are used as the distribution lines constituting the main line (6), the branch switch unit (2) employs a cable connector that allows easy cable attachment and detachment.

[Problem to be solved by the invention] In the device configuration applied to the conventional loop power distribution system,
Since the position of the loop switch (1) that divides the loop is uniquely fixed, in the case of an open-loop power distribution system, the load is adjusted to each separated main line in consideration of future fluctuations in power distribution capacity. In addition, in the event of a failure of a main line, power distribution across the entire area of the separated main line will be impossible, so structural measures have been taken to ensure recoverability, such as using cable connectors that are easy to connect and disconnect cables as mentioned above. There were issues such as the need to take into account

This invention was made in order to solve the above-mentioned problems, and aims to provide a high-voltage switchgear that can set the loop opening point in a high-voltage loop power distribution system to an arbitrary branch point corresponding to distributed loads. purpose.

[Means for Solving the Problems] A high-voltage switchgear according to the first invention is one in which switches that can be remotely controlled for main lines are arranged at both ends of a branch point to a distributed load supplied from a loop main line. It is.

The second invention is one insulating the switches provided at both ends of a branch point including the branch point.

[Function] This invention provides the function of a loop switch that divides a trunk line by arranging remotely controllable load switches for main lines at both ends of a branch point to create a uni-soto branch switch. This makes it possible to limit the fault isolation section in the event of a failure and to continuously supply power to healthy parts by controlling the switching from a distance.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
In the figure, (3) to (6) are similar to the conventional system described above. (7) is a branch switch unit which is a high voltage switchgear of the present invention, and (8) is a main line load switch that can be remotely controlled and is installed at both ends of the branch point (11) of the branch switch unit (7). be.

The high-voltage loop power distribution configured as described above will be explained using an open loop power distribution method. In Figure 1, while the normal loop opening is done by opening the load switch (8a), when it is better to use the load switch (8b) as the opening point due to the load distribution of each main line, the load The main line load switch (8) installed at both ends of the branch point of the branch switch unit (7) can close the switch (8a) and open the load switch (8b) to open any branch. Since the loop can be opened at one end of the point, the loop opening position can be freely selected as the load changes. Next, operations for each fault in the distribution line will be explained based on FIG. 2. If a failure occurs in the main line (4) at point 11, open the main line load switches (8C) and (8d) located at both ends of the main line, and close all other main line load switches. By closing the circuit, it becomes an open-loop power distribution that can maintain power distribution to all branch circuits, and if a failure occurs at point F2 of the branch circuit, the load switch for the main line (8e ) and (8f) and close all other main line load switches, an open-loop power distribution that can maintain power distribution to all branch lines except for the faulty part becomes possible.

Next, another embodiment of the invention will be described with reference to the drawings.

Since the capacity of the load switch (8) for the main line explained above is uniquely determined according to the capacity of the main line, the capacities of the load switches (8) connected to the branch points of the same main line may all be the same. On the other hand, a branch switch (3) and a distribution transformer (4) for low voltage distribution
) varies depending on the capacity of each branch circuit.

Therefore, in the second invention, the load switch (8) and the branch point (11), which are not affected by the branch circuit capacity, are integrated to improve the reliability and downsize the device. An example of such integration is shown in FIG.

In Figure 3, two load switches (8) (8) are connected to both ends of the branch point (11), and the load switches (8) (
8) Attach an external connection part (9) to each terminal and branch point (11).
a) (9b) (9C). The above high-voltage main circuit parts are integrally gas-insulated or solid-insulated, and the switchgear (l
O). As explained above, the same switching device (10) can be used at any branch point on the same trunk line.

That is, a plurality of switchgear (lO) are manufactured for the number of branch points of the main line and installed at each distributed load branch point during loop power distribution, as shown in FIG. By using a plurality of the same integrated switching devices (10) as described above, the device can be manufactured at low cost and its reliability can be improved.

Furthermore, as another embodiment of the above-mentioned inventions, the main line switches provided at both ends of the branch point of the branch switch unit are not used as load switches, but can be controlled remotely and are defined between the poles of the disconnect switch. In the case of a circuit breaker having a high withstand voltage performance, it is possible to cut off a short circuit in the event of a failure, which further improves operational stability.

In the above description of the embodiment, the high-voltage switchgear of the present invention was shown as an example in an open-loop power distribution system, but it goes without saying that it is also applicable to each branch point in a closed-loop power distribution system.

[Effects of the Invention] As in the first invention, when high voltage loop power distribution is applied in wide area distributed power distribution, the effect that the operability of power distribution can be improved by applying the indoor high voltage switchgear of this invention There is.

Further, as in the second invention, by integrating the branch point of the distributed load and the switches at both ends thereof, an inexpensive and highly reliable indoor high voltage switchgear can be obtained.

[Brief explanation of drawings]

Fig. 1 is a system diagram showing an example of application of this invention, Fig. 2 is a diagram showing operation in the event of a failure according to this application example, and Fig. 3 is an integration of load switch (8) and branch point (11). switchgear (l)
4 is a block diagram of the switchgear (10) shown in FIG. 3.
) is a block diagram of a loop power distribution showing another embodiment of the present invention to which the invention is applied, and FIG. 5 shows a system diagram based on conventional operation. In the figure, (7) is a branch switch unit, (8) (8
a) (8b) (8e) (lid) (8e) (
8f) is a load switch, (lO) is a switchgear, and (11) is a branch point. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (2)

[Claims] (1) When power distribution equipment is configured into a loop-shaped power distribution network,
An indoor high-voltage switchgear characterized by not having a dedicated loop switch, but having switches at both ends of the branch point to the distributed load supplied from the loop main line. (2) The indoor high voltage switchgear according to claim (1), wherein the switches 8, 8 provided at both ends of the branch point are integrally insulated including the branch point 11.