KR-20260064663-A - System for deciding failure of generating facility due to current transformer error

Abstract

A system capable of monitoring the abnormal condition of a substation facility in a continuous and real-time manner is disclosed. The system is characterized by comprising: a substation facility equipped with a remote terminal device and generating measurement data; and a management server that receives the measurement data via a communication network, determines whether there is an abnormality in the substation facility using the measurement data, and generates alarm information based on the determination of whether there is an abnormality.

Inventors

• 유병구
• 박춘오
• 최석종

Assignees

• 한국전력공사

Dates

Publication Date

20260507

Application Date

20260403

Claims (2)

1. A substation (110) equipped with a remote terminal device (111) that generates measurement data; and The system includes a management server (130) that receives the measurement data through a communication network (120), determines whether there is an abnormality in the substation equipment (110) using the measurement data, and generates alarm information according to the abnormality. The above management server (130) is, A collection unit (220) for collecting the above measurement data; A reading unit (230) that classifies by substation equipment using the above measurement data and generates an error between the above substation equipment; and It includes an analysis unit (240) that generates the alarm information using the above error, The error between the above substation equipment is the error between the 87 primary current transformer (①) and the 51P current transformer (②), and A system for determining faults in substation equipment due to current transformer errors, characterized in that the error between the above substation equipment is the error between the 87 secondary current transformer (③) and the 51S current transformer (④).
2. In Article 1, A system for determining a fault in a substation equipment due to a current transformer error, characterized in that the above error is generated by comparing the current values of the same phase between the 87 secondary current transformer (③) and the 51S current transformer (④) using the secondary side (23kV) current value of the main transformer (330), and the comparison is the value obtained by dividing the current value of the 87 secondary current transformer (③) by the current value of the 51S current transformer (④).

Description

System for deciding failure of generating facility due to current transformer error The present invention relates to a technology for determining current transformer faults, and more specifically, to a system and method for determining faults in current transformers of a substation in real time by utilizing big data from SCADA (Supervisory Control and Data Acquisition). Generally, current transformers (including transformer current transformers) are instruments for measuring current, and are used in combination with protective relays and/or power meters to protect facilities from fault currents such as overcurrents, or to measure power consumption for electricity billing. In order to ensure stable power supply and accurate calculation of electricity charges, current transformers must be managed to ensure normal operation at all times. However, when used for a long time, internal failures such as ground faults may occur due to the influx of external stresses such as abnormal voltage and overcurrent during use, which can lead to abnormal operation such as poor metering error. If an internal fault, such as a ground fault, occurs in the secondary winding of a current transformer, the measurement error of the current transformer increases, although the severity varies, making normal current measurement difficult. Such current transformer failures can cause electrical hazards due to the malfunction of protection equipment resulting from abnormal current measurement, and make accurate electricity billing difficult. However, internal failures in these current transformers generally do not show any outward signs of abnormality and are easily mistaken for normal operation, making it considerably difficult even to identify whether there is a problem. In addition, power outages caused by saturation, open circuits, and miswiring of substation current transformers are occurring continuously. Over the past 10 years, approximately 40 incidents, including busbar shutdowns, have occurred. Generally, current transformers for instrumentation and relays are used in 154kV substations, and current inspection methods include routine inspection, thermal imaging inspection, and visual inspection. To elaborate, there is a problem in that there is no method to constantly check for abnormal conditions in current transformers, so failures are detected only after they occur, leading to post-failure recovery. Therefore, there is a need for technology that can remotely manage and control information on various power facilities in substations, rather than these current inspection methods. FIG. 1 is a block diagram of a fault determination system for a substation according to an embodiment of the present invention. Figure 2 is a detailed configuration block diagram of the management server shown in Figure 1. FIG. 3 is a conceptual diagram of collecting data from a substation facility according to an embodiment of the present invention. Figure 4 is a table for determining normality using the error between the 87 primary transformer and the 51P transformer in Figure 3. Figure 5 is a table for determining normality using the error between the 87 secondary current transformer and the 51S current transformer in Figure 3. Figure 6 is a table for determining normality using the error between the current transformer for the main transformer meter (M.Tr (Main.Transformer) meter) and the current transformer for the distribution line meter (D/L (Distribution Line) meter) in Figure 3. FIG. 7 is an example showing the result of applying the present invention. Figure 8 is an example showing a typical power outage case related to a current transformer. FIG. 9 is a flowchart showing the fault determination process of a current transformer according to an embodiment of the present invention. The present invention is capable of various modifications and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the invention to specific embodiments, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. Similar reference numerals are used for similar components when describing each drawing. Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. The term "and/or" includes a combination of a plurality of related described items or any of a plurality of related described items. Unless otherwise defined, all terms used herein, including technical or scientific terms, have the