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This post was last edited by Jibao NARI – Microcomputer Protection – Islanding Prevention – Zhang on 2020-2-20 at 19:22. What is a transformer differential protection device? What are the characteristics of transformer differential protection devices? Next, we will explain in detail the transformer differential protection device for you. Introduction to Transformer Differential Protection Devices. Scope of application: 995 is primarily used for the differential protection as well as monitoring and control of main transformers at voltage levels of 110 KV and below. It is suitable for two-circuit main transformer differential protection and three-circuit main transformer differential protection. Protection functions include differential quick-break protection, ratio differential protection, differential current quick-break protection, and non-electrical quantity protection. Communication functions: The 995 transformer differential protection measurement and control device comes standard with an RS485 communication interface; an RS232 communication interface is available as an option, and an industrial-grade CAN communication interface can also be installed according to on-site requirements. Measurement functions: Equipped with 12 digital inputs, 4 voltage channels, 6 current channels, with a measurement accuracy meeting the national standard of grade 0.2. Product features of the 995 transformer differential protection measurement and control device: 1. It uses a high-performance imported 32-bit (DSP) signal processor, offering stable performance and fast processing speed. 2. It can support the Modbus protocol, as well as RS485 and RS232 communication interfaces; additionally, an industrial-grade CAN communication interface can be installed depending on the project requirements. It is well-suited for various communication scenarios, and can be combined with a microcomputer-based back-end system to form a power comprehensive automation system with four remote control functions. 3. It features a high-performance, fully enclosed metal chassis with a low depth, allowing it to fit into any type of cabinet and enabling easy installation. 4. It can perform self-checking; if there are problems with the device itself, it will automatically issue an alarm alert ； It has excellent self-protection capabilities, which can prevent damage to the device caused by wiring errors ； 5. An intelligent, maintenance-free design that eliminates the need to adjust the sampling precision at the point of use; the measurement accuracy is not affected by working conditions, **thereby enhancing the reliability and stability of the entire power automation system. 6. It is equipped with various non-electrical protection devices such as high gas level protection, low gas level protection, and high temperature protection. Insulation performance of the 995 transformer differential protection measurement and control device: 1. Intensity of insulation: between various live conductive circuits (either the enclosure or exposed non-metallic components), between AC circuits and DC circuits, and between AC current circuits and AC voltage circuits. For those with a rated voltage greater than 60V, they must be able to withstand an alternating voltage of 50HZ and 2KV for 1 minute without any breakdown or flickering occurring; for those with a rated voltage less than 60V, they must be able to withstand an alternating voltage of 50HZ and 500V for 1 minute without any breakdown or flickering. 2. Insulation resistance: The insulation resistance value, measured using a 500V open-circuit voltage tester, must be no less than 100 ohms between each live conductive part (such as the housing or exposed non-metallic components), between AC circuits and DC circuits, and between AC current circuits and AC voltage circuits!