American SEL Microcomputer Protection Device Debugging and Installation Method

Brand: SEL/USA

Delivery Time: Over one month

Application Areas: Chemical, Petroleum, Energy, Electrical, General

SEL Microcomputer Protection Device Commissioning and Installation Method (USA)

SEL products are composed of highly integrated, bus-less microcontrollers, high-precision current and voltage transformers, high-insulation-strength output intermediate relays, and high-reliability switching power supply modules. The microcomputer protection device is mainly used in power plants, substations, and distribution stations with voltage levels of 110KV and below. It can also be used for voltage and current protection and control in some systems with voltage levels between 70V and 220V.

Advantages of SEL Microcomputer Protection Device (USA):

Product Features: Ultra-thin size, powerful functions, excellent workmanship, beautiful appearance, and high cost-effectiveness. Nanjing Dongzi microcomputer protection devices feature high integration, complete protection configuration, strong anti-interference ability, low power consumption, and resistance to harsh environments. They are particularly suitable for installation in KYN-28 medium-voltage switchgear, ring network switchgear, and various box-type substations, and can also be installed in centralized panels.

Features of the American SEL Microcomputer Protection Device:

In addition to the advantages of microcomputer protection mentioned above, the American SEL microcomputer protection device has the following characteristics compared with similar products:

(1) Complete Variety: The microcomputer protection device offers a particularly complete range of varieties, meeting the various protection requirements of various equipment in different types of substations. This greatly facilitates substation design and computer networking.

(2) Hardware: The use of the latest chips enhances technical precision. The CPU uses an 80C196KB chip, with 14-bit A/D conversion and up to 24 analog input circuits. The acquired data is processed by a DSP signal processing chip, utilizing high-speed Fourier transform to obtain harmonics from the fundamental to the 8th order. Special software automatic correction ensures high measurement accuracy. A multi-CPU system is formed by using dual-port RAM and CPU to convert data, with communication via a CAN bus. It features high communication speed (up to 100MHz, generally operating at 80 or 60MHz) and strong anti-interference capability. On-site observation and setting of various protection modes and parameters can be easily performed via the keyboard and LCD display unit. (3) The hardware design employs special isolation and anti-interference measures in the power supply, analog inputs, digital inputs and outputs, and communication interfaces, resulting in strong anti-interference capabilities. Besides centralized panel mounting, it can be directly installed on switchgear.

(4) The software boasts rich functions. In addition to various measurement and protection functions, it can perform fault recording (1-second high-speed fault recording and 9-second dynamic fault recording), harmonic analysis, and low-current grounding line selection functions by cooperating with a host computer.

(5) It can use RS232 and CAN communication methods, supports multiple remote control transmission protocols, and facilitates networking with various computer management systems.

(6) It adopts a wide-temperature-range background 240×128 large-screen LCD display, which is easy to operate and provides a beautiful display.

(7) It features high integration, small size, and light weight, facilitating centralized panel mounting and decentralized installation on switchgear. SEL Microcomputer Protection (SEL551, SEL351A, SEL587, SEL751A, SEL)

Overview of SEL Microcomputer Protection (SEL):

Featured Applications

Monitor Transformer Life Trajectory: Transformers utilize the IEEE C57.91 Life Loss-1995 thermal model for various winding configurations (including three single-phase transformers). Direct measurement of ambient and maximum oil temperature via resistance temperature detectors (RTDs) or thermocouple (TC) input cards. Monitoring of both digital and analog sensor outputs, such as oil level and pressure.

Increased System Awareness: In addition to basic metering such as voltage and current measurements, the SEL-2414 provides metrics such as maximum/minimum metering, demand and peak demand, and energy data. Thermal model reports allow you to accurately trend transformer loads and correlate data with other system parameters. Use instrumentation data to better manage your assets and plan for future development.

Manage and Protect Critical Assets: Manage and protect critical substation assets and integrate transformer thermal through-fault monitoring. Assert alarms based on transformer thermal conditions or other monitored conditions.

Transformer and fan control – Load control utilizes exchange (LTC) in a wide variety of applications, from distribution transformers to large autotransformers (references). Furthermore, cooling fans for transformers eliminate maintenance surprises under critical load conditions. Fan banks are individually controlled to balance cooling duty cycles and increase the life of the cooling system. The LTC and fan control design template is implemented using the AcSELerator Hedge SEL-5030 software.