KR-20260066008-A - HIGHLY RELIABLE INTELLIGENT SWITCHGEAR

Abstract

The present invention relates to an intelligent switch and a self-testing method thereof. The intelligent switch performs switching operations with respect to a distribution line and includes a communication unit, a battery that performs charging using power supplied from the distribution line, and a processor that controls the communication unit so that, when a reference condition is satisfied, a signal indicating that the reference condition is satisfied is transmitted to a preset server, and in response to the transmission of the signal, blocks the supply of power from the distribution line for a predetermined time, and controls the power supply from the distribution line to be restored after the predetermined time has elapsed.

Inventors

• 김경태
• 임무현

Assignees

• 한국전력공사

Dates

Publication Date

20260512

Application Date

20260409

Claims (1)

1. As an intelligent switch that performs switching operations on a distribution line, Communications Department; A battery that performs charging using power supplied from the above distribution line; and A processor that, when the criteria condition for the intelligent switch to start a self-test is satisfied, controls the communication unit to transmit a message related to the test start time, test end time, and test items, along with a signal indicating the start of the self-test, to a preset server, automatically records the message in the memory of the server, and in response to the transmission of the signal, controls the supply of 220V power from the distribution line through the PT (potential transformer, instrument transformer) of the intelligent switch to be cut off for 5 minutes, and controls the power to be supplied again from the distribution line after 5 minutes have elapsed. Includes, Based on the above message, it is confirmed whether the intelligent switch is in a test state, and The above processor is, The battery is controlled so that the battery supplies power to the communication unit for a predetermined period of time, and The above processor is, At least one of the current and voltage of the battery is monitored during the above-mentioned predetermined time, and the normal operation of the battery is tested based on the monitoring information. The above processor is, If the battery is determined to be abnormal before the above predetermined time has elapsed, control is provided to supply power again from the power distribution line. The above processor is, An intelligent switch that controls the communication unit so that the above monitoring information is transmitted to the server.

Description

Highly Reliable Intelligent Switchgear The present invention relates to an intelligent switch and a self-testing method thereof, and provides an intelligent switch that performs switching operations on a distribution line and a self-testing method thereof. Distribution switches are used to detect and isolate faulty sections of distribution lines (distribution line protection coordination), reduce power outage sections during line work, and relieve overloaded lines through load switching. Along with transformers and circuit breakers, they are the most important core devices among all equipment used in power systems. Distribution switches can be classified into manual and automatic switches based on their operation method, and can also be categorized into gas-insulated switches, oil-immersed switches, and vacuum switches based on their internal insulation material. Among these, manual switches are operated by field workers directly opening or closing the switch on the ground, whereas automatic switches (intelligent switches) operate by opening or closing the switch via an intelligent distribution network from a remote distribution control center. These switches are equipped with drive units, Current Transformers (CTs) and Potential Transformers (PTs) capable of measuring current and voltage, as well as various status monitoring contacts and sensors. The Feeder Remote Terminal Unit (FRTU) is installed alongside intelligent switches to measure current and voltage flowing through distribution lines in real time and calculate various power quantities. In the event of a fault, such as a ground fault or short circuit, it detects the status and transmits it to a remote distribution control center. It also receives control commands from the switches and opens the distribution line at the fault location to minimize the extent of the fault (e.g., power outage). Furthermore, it stores all events occurring on the distribution lines to provide information for fault cause analysis and performs remote status monitoring and control of the distribution lines by transmitting the line status to a remote location using protocols such as DNP3.0. Meanwhile, as shown in Fig. 1, there is a trend in which communication-enabled terminal devices are attached to distribution switches to minimize power outage sections and enable remote operation. Switches that are capable of remote operation and power outage detection and are connected to communication are referred to as intelligent switches. 22.9 kV distribution lines are equipped with GAs to reduce power outage times and minimize fault sections. The proportion of GAs in distribution switches is over 60% of the total switches. These intelligent switches are normally switched on and off by an external power source, and in the event of a power outage, they are switched on and off by their own batteries. On a normal line, the intelligent switch supplies power from the 22.9kV distribution line → switch PT (transformer) → control unit → switch body and distribution automation terminal unit (FRTU) → battery (charging) → modem. On a power outage line, the intelligent switch supplies power from the battery (discharging) → control unit → switch body and distribution automation terminal unit (FRTU) → modem. In other words, the intelligent switch receives power from the distribution line during normal operation, but is driven by the battery in the event of a power outage. In the event of a power outage, control of switching operations must be performed using power supplied by the battery; however, this poses a problem due to the high failure rate of batteries and the difficulty in extracting defective ones. Furthermore, since the circuits of the control unit and the power unit are exposed to the external environment, there is a possibility of circuit-related issues occurring. (Patent Document 0001) Republic of Korea Registered Patent Publication No. 10-1725514 (Registered on April 5, 2017) Figure 1 is a configuration diagram for explaining an intelligent switch. FIGS. 2 and FIGS. 3 are actual example drawings of intelligent switches. FIG. 4 is a block diagram illustrating an intelligent switch according to an embodiment of the present invention. FIG. 5 is a flowchart for explaining a self-test method using the intelligent switch of FIG. 4. Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Identical or similar components are assigned the same reference number regardless of the drawing symbols, and redundant descriptions thereof will be omitted. The suffixes "module" and "part" used for components in the following description are assigned or used interchangeably solely for the ease of drafting the specification and do not have distinct meanings or roles in themselves. Furthermore, in describing the embodiments disclosed in this specification, if it is determined that a detailed description of related prior art could obscure