PRODUCTS

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      SUBSTATION TOTAL DIAGNOSTIC SYSTEM

      System Overview

      As industries progress, the diversity and advancement of equipment among consumers of power facilities are increasing. Consequently, there is a simultaneous demand for superior quality in power facilities and operational stability. The "Substation Total Diagnostic System" is designed and developed to diagnose and analyze the operational status and signs of faults in real-time for power company substations operating continuously. It provides real-time alerts to operators. The diagnostic information and operational history are optimized for use by power companies as long and short-term operational data, facilitating database management, voltage and equipment condition monitoring, and maintenance planning, all within the realm of leveraging Big Data.

      COMPOSITION

      GIS Element Technology GIS Partial Discharge Diagnostic Detecting/Diagnosing Partial Discharge Signals when Electrical Interference and Insulation Issues Occur within GIS to Verify GIS Reliability
      Breaker Operation Characteristic Analysis Measuring/Analyzing Operating Current and Operating Time during the insertion or opening/closing of a circuit breaker to verify the reliability of the circuit breaker
      Transformers Element Technolo Transformers Partial Discharge Diagnostic When there's electrical interference or insulation issues within the transformer, detecting/diagnosing partial discharge signals to verify the transformer's reliability
      Bushing Leakage Current Diagnostic Measuring/Analyzing Leakage Current Generated by Bushing Insulation Deterioration in Transformers to Verify Bushing Reliability
      OLCT(On Load Tap Changer) Diagnostic Measuring/Analyzing Partial Discharge Signals within OLTC and Motor Drive Current of OLTC to Verify OLTC Reliability
      Insulating Gas Diagnostic Monitoring/Analyzing Insulating Oil Gas Generated from Transformer Insulation Deterioration to Verify Transformer Reliability

      SYSTEM SCREEN CONFIGURATION

      Certification

      Electric Strength Test Procedure IEC 60950-1 : 2005/A2 : 2013 (Edition2.2) Electrostatic discharge IEC 61000-4-2 : 2008, Level 3
      High Temperature Operation IEC 60068-2-2 : 2007 Radiated Susceptibility IEC 61000-4-3 : 2008, Level 2
      Low Temperature Operation IEC 60068-2-1 : 2007 Electric Fast Transient IEC 61000-4-4 : 2012, Level 3
      High Temperature Storage IEC 60068-2-2 : 2007 Surge Transient IEC 61000-4-5 : 2014, Level 3
      Low Temperature Storage IEC 60068-2-1 : 2007 Conducted Susceptibility IEC 61000-4-6 : 2013, Level 3
      Damp Heat, Cycle test IEC 60068-2-30 : 2005 Magnetic Field Immunity IEC 61000-4-8 : 2009, Level 4
      Vibration Response Test IEC 60068-2-6 : 2007 Voltage dip/interruption IEC 61000-4-11 : 2004
      Vibration Endurance Test IEC 60068-2-6 : 2007

      GIS PREVENTIVE DIAGNOSTIC SYSTEM

      BREAKER OPERATION CHARACTERISTIC ANALYSIS

      • BREAKER OPERATING CHARACTERISTIC ANALYSIS DEVICE

      • AC CURRENT SENSOR

      • DC CURRENT SENSOR

      • BREAKER OPERATION CHARACTERISTIC ANALYSIS

      The circuit breaker operating characteristic analysis device monitors, analyzes, and diagnoses the mechanical operating characteristics and variations of circuit breakers by utilizing acquired values of Trip/Close coil operating currents, AC load currents, and circuit breaker opening/closing contact signals. This device predicts the timing for preventative maintenance of the circuit breaker based on its types.

      Function
      Input Port Detail
      Trip Coil : 2 Channel Detection of coil current during circuit breaker opening
      Close Coil : 1 Channel Detection of coil current during circuit breaker closing
      Current : 3 Channel Measurement of circuit breaker-specific load currents
      Auxiliary Contact : 2 Channel Measuring opening and closing current times using auxiliary contacts
      Etc Accumulation of circuit breaker operation counts
      analysis of measured data trends

      TRANSFORMER PREVENTIVE DIAGNOSTIC SYSTEM

      TRANSFORMER PARTIAL DISCHARGE DIAGNOSTIC

      • Transformer Partial Discharge Diagnostic DAU

      • Main Body Partial Discharge Sensor

      • Transformer Partial Discharge Diagnostic

      An system that acquires partial discharge signals occurring due to internal anomalies in the M.Tr through sensors, processes the digital signals through the Local Unit's DAU, and transmits them to the diagnostic unit as data CU (communication device). It monitors, analyzes, and diagnoses partial discharge, making assessments based on abnormal indications. This system includes sensors, Local Unit (including DAU and CU), and the diagnostic unit (including diagnostic software).

      SYSTEM CONFIGURATION AND SPECIFICATION
      Product Composition and Specification
      UHF Senor 300MHz ∼ 1,800MHz
      Local Unit - DAU (Data Acquisition Unit)
      - CU (Communication Unit)[IEC 61850 base]

      BUSHING LEAKAGE CURRENT DIAGNOSTIC

      • Bushing Diagnostic Device

      • Bushing Diagnostic Adapter

      • Bushing Leakage Current Diagnostic

      The Bushing Leakage Current Analysis Device (BMD) is a diagnostic tool monitoring insulation degradation within the transformer's bushing. It measures and analyzes the capacitance, leakage current, and phase of the transformer's bushing to predict the timing of equipment maintenance.

      Function

      - Current and Voltage Vector Display
      - Compatible with 800 kV, 362 kV, 170 kV Transformer Bushings

      - Calibration Function According to On-Site Conditions
      - Real-Time Trend Analysis

      Measurement and Analysis Items
      Measurement of Transformer Phase Voltage (PT Secondary) Measurement of Bushing Leakage Current (Phases A, B, C) Bushing Capacitance Analysis Bushing Power Factor (%) Analysi Real-time Trend Analysis

      OLCT DIAGNOSTIC

      • OLTC Diagnostic Device

      • OLTC Partial Discharge Sensor

      • OLTC Current Sensor

      • OLTC Diagnostic

      This is a system that continuously monitors and diagnoses the On-Load Tap Changer (OLTC) of a power transformer. It monitors real-time electrical signals such as arcs and corona discharge occurring due to internal faults in OLTC, and also tracks the filtering pressure, oil temperature, and insulation oil contamination of the Oil Filter Unit (OFU) used for insulating oil filtration. In case of anomalies, it triggers alert functions and provides OLTC monitoring information to the diagnostic unit via the data communication device (CU) of the comprehensive preventive diagnostic system for the substation.

      SYSTEM CONFIGURATION AND SPECIFICATION
      Product Composition and Specification
      UHF Partial Discharge UHF Sensor (300MHz~1,200MHz)
      Drive Unit - Drive Motor Operating Current (Excessive and Rated Current, and the Trend of Waveform Pattern Changes)
      - Motor Drive Contacts (Operating Time, Operating Frequency)

      INSULATING GAS DIAGNOSTIC

      This device, installed in the incoming power transformer, continuously monitors the state of insulating gas generated due to internal insulation degradation and the increase of moisture that deteriorates insulation. It performs alert functions in case of anomalies and provides insulating gas analysis information to the diagnostic unit through the signal acquisition device (DAU) and data communication device (CU) as per the substation's comprehensive preventive diagnostic system specifications.

      Types of Analytical Gases Detection Range Error
      Device Specifications KEPCO Specifications
      Hydrogen (H2) 5~5,000 ppm 5~5,000 ppm ±10% or ±LDL
      Carbon Monoxide (CO) 10~50,000 ppm 10~5,000 ppm
      Acetylene (C2H2) 3~50,000 ppm 5~5,000 ppm
      Moisture (H2O) 0~100% RS 0~100% RS

      SUBSTATION TOTAL DIAGNOSTIC SYSTEM

      • Substation Total Diagnostic UNIT

      • GIS Preventive Diagnostic System GLU

      • Transformer Preventive Diagnostic System MLU

      DIMRUS EQUIPMENT INVENTORY

      Dimrus Company was founded in 2009, specializing in the development and manufacturing of cutting-edge diagnostic equipment for stable operation of major high-voltage equipment such as transformers, circuit breakers, and generators.
      They provide customers with portable devices for continuous condition monitoring of high-voltage equipment and for precise and versatile diagnostics purposes.
      Dimrus products are globally recognized for their performance and quality, selling to more than 45 countries, including major clients in the United States, the United Kingdom, and many others.
      Gabo Corporation signed a domestic distribution agreement with Dimrus Company in 2019, aimed at collaborating in the preventive diagnosis field. They exclusively supply Dimrus Company's preventive diagnostic equipment such as the PD-Analyzer (multi-purpose partial discharge diagnostic device), PD-Unit (portable partial discharge diagnostic equipment), Test-PD (portable cable diagnostic equipment) within the domestic market.

      PD-Unit

      Portable Insulation State Online Monitoring Device

      FUNCTION
      • Without a screen or keyboard, all control can be managed via a standard wireless communication interface from a smartphone or tablet.
      • Built-in HF and UHF frequency sensors for PD measurements
      • Connectable to four types of external sensors
      • The PD-Unit can measure the insulation status of cable, GIS, power transformers, switchgear, terminals, and connections related to partial discharge.
      • Includes an integrated battery
      Accessory

      • - The basic sensor is built into the main body.
        - Additional provided sensors
           1) External acoustic sensor
           2) HFCT (High-Frequency Current Transformer)
           3) TEV (Transient Earth Voltage) sensor
           4) UHF frequency sensor

      Test-PD

      High Voltage Cable Connection and Line Status Online Diagnostic Device

      FUNCTION
      • It can diagnose the terminations and connections of operating high-voltage cables of 6.0 (kV) and above, as well as the status of the cable line, all online.
      • The device is equipped with self-diagnostic algorithms, allowing ease of use for diagnosticians without requiring special training.
      • Diagnostic results can be accessed and managed via wireless communication interface using a smartphone or tablet.
      TECHNICAL FEATURES
      1. The device integrates five types of built-in measurement sensors, providing rapid assessment of insulation and fault conditions in connection with the information from these sensors.
         1) Acoustic ultrasonic sensor for partial discharge diagnosis
         2) Electromagnetic high-frequency PD sensor
         3) Capacitive VHF PD sensor
         4) Contact-based temperature sensor designed to measure the temperature of connections
         5) Power frequency current sensor for measurement synchronization
      2. Partial discharge diagnosis occurs across three frequency ranges: ultrasound (AC), high-frequency (HF), and very high frequency (VHF), providing a measurement approach to detect various types of insulation faults.
      3. The contact-based temperature sensor evaluates the temperature of connections and is designed to identify points of failure associated with temperature rises.
      4. With a current sensor, measurements synchronize with the cable's current, necessary to determine the type of insulation fault in monitored connections.
      USE
      1. To diagnose the equipment, there are built-in sensors in the central part of the backside of the device. Simply bring it close to the area you want to measure. The acoustic and
         temperature sensors have holes in the housing cover to enhance sensitivity, while the rest operate through the rear housing cover that can penetrate electronic waves.
      2. As you move the Test-PD device along the connector's surface, you can compare areas with increased partial discharge intensity or higher temperatures. This diagnostic method can
         estimate the location of insulation faults, and the intensity of each sensor's measured signal is displayed in bar graph format.
      3. Depending on the cable discharge form, the device screen displays a red cursor indicating the discharge form in real-time on an approximate cross-section of the cable. In the case of
         external noise, the red cursor reacts outside the cable system.
      4. The intensity, represented by the number and brightness of the displayed cursors, is designed to vary according to the energy intensity of the actual internal partial discharges in the
         equipment.
      5. When the device's current sensor detects current in the cable line, the device screen displays the symbol "N," and all diagnoses of faults synchronize with the sine wave phase of the
         power. If this signal is absent, the "G" symbol appears on the screen, synchronizing with the internal power source to carry out measurements.
      ADVANTAGES
      Firstly, Test-PD allows all basic information and analyzed data obtained from the device to be accessed and used on other devices with the same interface through integrated Bluetooth wireless connectivity.
      Information from the Test-PD device can be received wirelessly using interfaces such as smartphones or tablets. The image on the left shows the Test-PD device and a smartphone, displaying the same screen as that measured on the device itself.

      Secondly, by mounting the Test-PD device on a bar, measurements can be taken in narrow spaces where access to equipment is difficult. The results of these measurements can be viewed on the screen of a smartphone.
      DEVICE SPECIFICATION
      CPU frequency range 2~100MHz, 0.1~2MHz, 40kHz
      Measurement temperature range, (°C) -40 ~ +120
      Wireless interface Bluetooth 4.1
      Device operating temperatur, ° C -20 ~ +40
      Battery usage tim (Hour) 10
      Device and the main body size (mm) 205 x 85 x 75, plastic (ABS)
      Device weight (kg) 0.3
      Transportation case size (mm) 300 x 270 x 145
      Weight of the transport case for the device (kg) 2.0

      PD-Analyzer HF / UHF

      A wide-area diagnosable partial discharge diagnostic device

      • PD-Analyzer HF&UHF

      • PD-Analyzer HF&UHF Accessory Box

      FUNCTION
      • It can be considered as the most useful device for precisely analyzing the insulation condition of high-voltage equipment
      • Capable of measuring partial discharges in HF and UHF bands (able to diagnose underground cables using RF-CT)
      • Able to diagnose winding conditions of generators and motors (TEV sensor applicable)
      • Embedded diagnostic analysis program ('PD-Expert')
      • Capable of analyzing pulse generation time and location with the Time of Arrival feature
      • The signals are measured with six independent channels, each with different synchronization signals, allowing confirmation of how partial discharge pulses are distributed and where they occur on high-voltage equipment.
      • Provides insulation partial discharge measurements over a wide frequency range like HF and UHF, enabling measurement and analysis of partial discharges in all types of high-voltage equipment including transformers, GIS, cables, etc.
      • One of the main advantages of this device is the embedded specialized analysis algorithm 'PD-Expert,' used for automatic diagnosis of insulation faults in high-voltage equipment, allowing easy transmission of diagnostic analysis results even for users with no experience.
        - This device is designed with hardware and firmware to eliminate external signal noise during the partial discharge measurement process, and it is equipped with the 'Time of Arrival' analysis feature to accurately locate the source of the discharge.
      • When the device's built-in program function, 'PD-Expert,' is activated, it enables the analysis of pulse frequencies that aid in distinguishing random pulses from partial discharges. This capability assists in identifying types of insulation faults and assessing their associated risks
      • Automatic generation of diagnostic reports for high-voltage equipment is feasible, and users can also modify these reports as neede
      • The signals from partial discharges occurring in the bushings of power transformers can be measured using the DB-2 sensor.
      • The RFCT sensor allows for the detection of faults in cable connections and lines.
      • The diagnosis of GIS can be measured by installing a UHF sensor on the spacer, enabling approximate location tracking diagnosis through an ultrasonic sensor.
      • There are two methods for diagnosing partial discharges in the stator winding of high-voltage motors and generators.
        - You can measure it by using coupling capacitors (capacitive PD sensor) in advance on the stator winding of the high-voltage motor or generator.
        - You can measure it using temperature sensors on the winding or discharge sensors pre-installed in the stator slots.
      Parameter
      Number of measurement channels 6
      Operating voltage, kV > 3
      Discharge pulse frequency, MHz 0.5 ~ 1500,0
      Discharge amplitude, pC 20 ~ 100,000
      Computer connection USB
      Supply voltage, V, AC / DC 90 ~ 260
      Operating temperature range, °C 0 ~ 60
      Case size, mm 520 x 435 x 230
      Total weight, kg 25
      PD Simulator

      Partial Discharge Signal Simulator

      FUNCTION
      • The device is designed to emulate six types of partial discharge patterns that can occur in insulation defects and electrical interference in high-voltage equipment.
        1. Partial discharge inside the insulation
        2. Partial discharge of the 'floating potential' type
        3. Surface discharge at ground potential
        4. Surface discharge from high-voltage electrodes
        5. Corona discharge from high-voltage electrodes
        6. Surface discharge from the 'ground electrode
      TECHNICAL FEATURES
      1. It can simulate partial discharge signals similar to those of low voltage breakdown.
      2. The simulator for generated fault types has a separate BNC connector for connection with PD measurement devices and oscilloscopes.
      3. To simulate various forms of partial discharge, the device has an external voltage adjustment handle, enabling gradual voltage changes to observe the detailed shapes and types of PD occurrences.
      Parameter
      Number of measurement channels 6
      Voltage applied to the models of defects, kV Up to 5.5
      PD amplitude in models, V Up to 2
      Simualtor supply voltage 220V, 1A
      Diemensions, mm 475 * 415 * 215
      Weight, kg 20