Product Introduction

Substation high-voltage electrical equipment insulation conditions are typically monitored in two ways: online monitoring and live (portable) online testing.

The ED8020 capacitive equipment insulation online monitoring and analysis system can obtain characteristic parameters reflecting insulation anomalies in real-time, facilitating automated management; however, it requires a relatively high investment, is more complicated to install and construct, and necessitates regular maintenance. In contrast, the portable live-line detection method offers advantages such as low investment, strong targeting, ease of installation and maintenance, and updates. By simply installing a sampling unit or a clamp-on sampling sensor on electrical equipment in advance, regular inspections of operating electrical equipment can be conducted using portable live-line detection instruments. This method can also achieve the goal of promptly identifying insulation defects and extending the pre-outage testing period, completely replacing the more expensive online monitoring approach. The ED8020 capacitive equipment insulation online monitoring and analysis system, whether it's the sampling unit or the detection instrument, is technologically and in terms of ease of use, far superior to previous detection systems (previous sampling units had safety hazards, and detection instruments were not user-friendly and could not easily upgrade to online monitoring systems).

ED8020 Capacitive Device Insulation Online Monitoring and Analysis System, featuring a brand-new design structure, overcomes the defects of existing live-line testing systems. It offers various testing functions, enabling both online and offline measurements of dielectric loss and capacitance in capacitive devices, as well as testing of zinc oxide arrester resistive current parameters. Primarily used for real-time online monitoring of transformer bushings, CTs, CVTs, and coupled capacitors' capacitance, dielectric loss values, and end-screen currents, as well as the full current, resistive current, and capacitive current of lightning arresters, to determine the insulation status of the equipment.

The ED8020 capacitive device insulation online monitoring and analysis system is primarily composed of a detector and a sampling unit. It is used for the detection of dielectric loss and capacitance of capacitive electrical equipment (insulators, CT, CVT, coupling capacitors) under power. It has been installed and used on nearly 10,000 high-voltage electrical equipment, effectively detecting multiple insulation defects, gaining the trust of users. The Southern Power Grid and the North China Power Grid have also formulated field application guidelines for this product.

The ED8020 capacitive equipment insulation online monitoring and analysis system is superior to previous detection systems in both technical aspects and ease of use, whether it's the sampling unit or the detection instrument.

Product Alias:

Capacitive Equipment Online Monitoring System, DC System Insulation Monitoring, DC System Insulation Monitoring Device, Insulation Online Monitoring Device, Insulator Pollution Online Monitoring, Cable Insulation Online Monitoring Device, Insulation Online Monitoring Method, Insulation Online Monitoring, Insulator Online Monitoring

Product Features

The successful development of the ED8020 capacitive equipment insulation online monitoring and analysis system is attributed to the adoption of high-performance current sensors and advanced embedded systems. Compared to similar detection systems, it features the following:

1. Replacing the previously commonly used "sampling protection unit" (which includes multiple switch circuits, used during testing to switch the end screen current to the test equipment, posing the risk of an open circuit at the end screen, and requiring the operation of multiple shorting strips to direct the end screen current to the test equipment), the sampling unit of the ED8020 capacitive equipment insulation online monitoring and analysis system utilizes a through-core current sensor. This sensor is installed locally near the equipment, ensuring there are no breaks in the end screen leads and with a minimal lead distance, thereby fundamentally eliminating safety hazards like open circuits. The sensor accurately detects input signals within the range of 100μA to 1000mA. It has a low input impedance, capable of withstanding the effects of 10A AC current and the impact of 10kA lightning surges, meeting the requirements for online detection.

2. The sampling unit of the ED8020 capacitive equipment insulation online monitoring and analysis system features a pressure die-cast aluminum shell for waterproof sealing design. The secondary output uses a waterproof cable connector for easy testing connections. After the sensor is installed, it is normally non-powered. For testing, simply connect the secondary cable of the sampling unit, enabling "plug and play" without any operation required on the final screen signal leads.

3. The core processor of the ED8020 capacitive equipment insulation online monitoring and analysis system uses a 32-bit floating-point high-performance digital signal processor (DSP) from Texas Instruments (TI) Company. This DSP runs a real-time operating system and employs an external 16-bit, high-speed, multi-channel synchronous sampling analog-to-digital converter (A/D), enabling real-time measurement and high-precision calculation of the monitored quantities. It is capable of simultaneously monitoring multiple devices.

4. The ED8020 capacitive equipment insulation online monitoring and analysis system offers two methods of online dielectric loss detection. It can measure the difference in dielectric loss and the capacity ratio of two identical capacitive equipment, as well as use the PT secondary side voltage as a reference signal to measure the capacity and dielectric loss values of the equipment. Employing an auto-compensating high-precision current sensor and advanced digital filtering technology, it effectively addresses the accuracy and stability issues in dielectric loss testing. Combined with comprehensive electromagnetic shielding measures and advanced digital filtering processing technology, it ensures that the test results are not affected by harmonic or pulse interference, achieving a detection accuracy of up to ±0.05%.

5. The ED8020 capacitive equipment insulation online monitoring and analysis system has been enhanced with the detection function for the difference in dielectric loss and the capacity ratio of the same-phase capacitive equipment. Not only does it prevent distortion in dielectric loss test results caused by using the PT secondary side voltage as the reference signal, but it also helps to reduce the impact of inter-phase electric field interference.

6. The ED8020 capacitive equipment insulation online monitoring and analysis system is equipped with a large-screen Chinese LCD screen, used for displaying monitored data such as voltage, current, dielectric loss, resistive current, and capacitive current.

7. The ED8020 Capacitive Equipment Insulation Online Monitoring and Analysis System not only features real-time online detection capabilities but also allows for long-term continuous online monitoring of the equipment, automatically recording all monitored data.

8. The ED8020 capacitive equipment insulation online monitoring and analysis system replaces the "sampling protection unit" with an external sensor, allowing for a seamless upgrade from "live testing" to "online monitoring" mode while the equipment is operating normally. There's no need to remove the installed sensor or shut down the equipment; simply install the monitoring unit (IED).

9. The ED8020 capacitive equipment insulation online monitoring and analysis system features a portable design structure, with simple operation and use. The internal lead-acid battery can support 8 hours of continuous working time, fully meeting the on-site operation requirements.

Technical Specifications