DC Ground Fault Detect System

GFDS1000DC Ground Fault Detect System

Overview of development technologies

The DC Ground Fault Detect System is a real-time monitoring system to prevent ground accidents of DC supply power systems used in power plants and substations.

The Ground Fault Detect Module Source (GFDMS) periodically generates AC signal. The ground fault detect module(GFDM) measures the leakage current (Ix) of each line at all times and derives insulation resistance (Rx) and capacitance (Cx).

The monitoring system is connected to each module to collect all the measured data and to provide historical, state, and alarm management of the collected data. This system makes easy maintenance for DC power supply line.

Key functions and characteristics

· The Ground Fault Detect Module Source (GFDMS) periodically generates the diagnostic signal power to the system.

· The leakage current sensing clamp installed on the DC control power line uses a retractable shielding type and has good sensitivity characteristics and can be operated in power on-line state.

·The processors in each Ground Fault Detect Module (GFDM) communicates to the monitoring system with a fast DSP based on the ARM core.

· Monitoring and alerting system for insulation resistance of DC control power lines based on server PC and LAN communication.

DC Ground Fault Detect System configuration

EXISTING TECHNOLOGY

- Measure only leakage current

- Low precision

- Real-time monitoring only

NEW TECHNOLOGY

- Measure capacitance (Cx) and Resistance (Rx) of DC control power system

- Manageable with insulation over 100K ohms

- Historical management possible with real-time monitoring and data storage

DC GROUND FAULT DETECT SYSTEM

- It is possible to clearly distinguish whether the detected leakage current is resistive or capacitive.

- Intuitively observe changes in DC distribution lines according to external environmental changes.

- Securing system stability by managing insulation resistance over 100K ohms

- Possible to recognize problematic DC distribution lines through history management

GFDMS / GFDM 진단 전원 모듈 / 감시모듈 이미지

· Ground Fault Detect Module Source (GFDMS) Periodically apply the current source for measurement.

· Ground Fault Detect Module (GFDM) It receives the input current of each line through the small current clamp composed of zct, amplifies it, filters it, and measures it.

· The processor of the monitoring module adopts an arithmetic module based on ARM cortex-m7, enabling real-time high-speed arithmetic processing of leakage current, insulation resistance and capacitance.

Small current Sensing module 미소전류 센싱 모듈 이미지

· Sensing module Bipolar balanced pair signal processing minimizes the influence of ambient noise.

· Easy to install on already installed lines by using small current clamp composed of retractable zct.

Installation example 설치 사례 이미지

Monitoring and alarm system

· The monitoring system is composed of a data server, a switching hub, a PC, a monitor and a printer, and is connected to the monitoring module and communication. It is a device that collects and manages all measured and calculated data.