JPS61288526A - Remote supervisory and control system for power equipment - Google Patents

Abstract

PURPOSE:To obtain a system capable of transmitting a signal wit the low voltage specification without special installation of a communication system by providing a signal injector and a detector to a shield layer of a cable. CONSTITUTION:Since a shield copper tape, that is, a shield layer 2 to prevent malfunction due to electrostatic shielding is formed normally to a cable, the shield layer 2 is utilized to transmit a signal for supervision and control. Thus, the shield layer 2 is provided with the signal injector and the signal detector. As the signal injector and the signal detector, a signal injecting transformer and a search coil type sensor are used. Thus, a signal injected to the injector of a remote control slave station 51 is detected by the detector of a remote control slave station 52, and a signal injected to the injector of the remote control slave station 52 is detected by the detector of the remote control slave station 51 similarly so as to attain the signal transmission in two-way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a remote monitoring and control system for power equipment (mainly power distribution equipment) that is supplied with power via an electric cable.

[Conventional technology]

2. Description of the Related Art Conventionally, power equipment supplied with power via a cable has been monitored and controlled using a power line 9 communication line, wireless communication, or the like.

[Problem that the invention seeks to solve]

However, since the ground capacitance of the cable is large when using electric power transmission, not only is it necessary to increase the signal injection capacity, but also the equipment becomes larger because the signal is directly injected into the high voltage or extra high voltage line. It is expensive and difficult to maintain and operate ◎In addition, those that use one communication line have problems such as installation costs and installation space ◇
Furthermore, the fact is that devices without SIK are not used much at present because it is difficult to secure a frequency and there are problems with reliability.

Therefore, it is an object of the present invention to provide a remote monitoring and control system for power equipment that is capable of transmitting signals with low voltage specifications without the need to specially install communication cables.

[Means for solving problems]

A signal injector and a detector are provided in the shielding layer of the cable.

[Effect]

By injecting this signal and transmitting monitoring and control signals via the detector, it is possible to eliminate the need for special installation of communication cables, thereby simplifying the system and reducing costs.

〔Example〕

11t! FIG. 1 is a schematic diagram showing an embodiment of the present invention.

In the figure, 1 is the cable, 2 (point M3i1: cable layer 1, alt32 is the pole switch, 41.4
2 is a signal injection/detector, 51.52 is a remote monitoring/control slave station (also called 0), 61.62 is a power transformer for the remote slave station, and 71 is a high voltage or extra high power distribution line. It is.

That is, this embodiment is an example in which power is supplied from a remotely controlled slave station 51 located on a remote island or mainland A to a remote controlled slave station 52 located on a remote island B via the submarine cable 1. Cables are usually coated with a thin steel tape, or a thin layer 2, to prevent malfunctions caused by static electricity.
Performs signal transmission for control. For this purpose, the thin layer 2 is provided with a signal injector and a signal detector.

As the signal injector and signal detector, well-known signal injection transformers, search coil sensors, etc. are used, respectively, and in this case, each of 41 and 42 includes a signal injector and a signal detector. It is shown integrally as . Therefore, the signal injected into the injector on the side of remote control slave station 51 is detected by the detector on the side of remote control slave station 52, and similarly, the signal injected into the injector on the side of remote control slave station 52 is detected by the detector on the side of remote control slave station 52. Child station 51
Bidirectional signal transmission is possible as detected by side detectors. Each of these remote control slave stations is connected to a master station (not shown) via a cable, and signals are transmitted between the master station and slave stations using a normal power line carrier method or a dedicated line (communication line, optical cable). However, it goes without saying that the signal transmission between the master station and the slave station may be performed using a barrier layer as in the present invention. 0 which is a schematic diagram showing
This is an example of application to an underground distribution line system, in which cable 1 is an underground distribution line, remote control slave stations 51 and 52
Since this is almost the same as in FIG. 1 except that the terminals are connected via switches swl and SW2, a description thereof will be omitted. In addition, 8 is a substation or multi-circuit switch,
SWa is a switch connected to the demand end. again\
The underground cable system can also be applied to rivers, lakes, or wide roads.

〔Effect of the invention〕

This invention utilizes the thin layer normally formed in cables to transmit signals for monitoring and control.
This not only eliminates the need for special signal lines, but also enables low-voltage specifications, resulting in smaller size, lighter weight, and lower cost, which has the advantage of improving operability, safety, and maintainability. brought about.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the invention, and FIG. 2 is a schematic diagram showing another embodiment of the invention. Description of symbols 1... Cable, 2... Sheer layer of cable 1, 31, 32... Pole switch, 41
, 42... Signal injection/detector, 51.52...
... Remote monitoring/control slave station (remote control slave station), 61,6
2...Power transformer, 71...High voltage or extra-high distribution line, 8...Substation or multi-circuit switch, SWt~SW3...Switch .

Claims (1)

[Claims] In a system for remotely monitoring and controlling power equipment supplied via a cable having at least a thin layer, a signal injector and a signal detector are provided in the thin layer, and the signal injection and the signal detector are provided. A remote monitoring and control system for power equipment, characterized by transmitting signals for monitoring and control.