The microcomputer protection device is a new generation of microcomputer relay protection equipment specially developed by our company to meet the requirements of modern switch cabinet miniaturization. It provides perfect protection functions for primary equipment such as overhead lines, cable lines, transformers, motors, capacitors, PT, etc. with voltage levels of 35KV and below. The product appearance is carefully designed, small and exquisite, and can be directly installed on various small-space ring network switch cabinets such as solid cabinets and inflatable cabinets.

Features

◆ Adopt the latest high-integration single-chip microcomputer development platform, the bus does not leave the chip, and has good anti-interference performance;

◆ Adopting a unified hardware framework and software platform, the product consistency is good;

◆ The device adopts a fully sealed aluminum alloy structure, has strong anti-electrical interference ability, small appearance, and is very easy to install;

◆ The protection function configuration is flexible and complete, and various protection functions can be activated or deactivated through control words;

◆ The analog input, switch input, power input and communication interface parts adopt the anti-interference measures of transformer isolation, photoelectric isolation and TVS protection, which makes the device have a particularly strong anti-interference ability;

◆ The device has a complete self-checking function. When it is found that the device is not working properly, it can reliably lock the protection outlet to ensure that the device does not operate erroneously;

◆ Using a dedicated clock chip, supported by a separate crystal oscillator and equipped with a backup battery, the clock can keep correct time even after the device loses power, allowing the device to accurately record various fault information;

◆ The device has three levels of watchdogs, external hardware watchdog, CPU hardware timer watchdog and software watchdog, to ensure that the device will not crash under any circumstances;

◆ It has a high-speed photoelectrically isolated RS485 communication interface, which ensures stable and reliable communication and provides users with an open communication protocol to facilitate the realization of an integrated automation system;

◆ The software in the device adopts modular design, has multiple redundancy measures, and has been tested in field operation for a long time, so the program runs stably and reliably;

◆ It adopts a full Chinese LCD display interface, multi-layer menu display, rich display information, and a friendly human-machine interface. The debugging work can be completed without complex training.

Working environment conditions

◆ Ambient temperature: -20℃-+60℃;

◆ Relative humidity: 5%-95%;

◆ Atmospheric pressure: 86-106KPa.

Technical Parameters

Main electrical technical parameters

◆ Working power supply: AC/DC85-265V;

◆ The allowable deviation is ±20%, and the ripple factor is not more than 5%;

◆ Zero sequence current: 0.1A-6.25A;

◆ Voltage: 5V-160V;

◆ AC current: rated 5A or 1A (please specify when ordering);

◆ AC voltage: 57.7V or 100V (please specify when ordering);

◆ Rated frequency: 50Hz;

◆ Power consumption: DC circuit is not more than 5W AC circuit is not more than 0.5VA;

◆ Accurate measurement range: phase current 0.11n-201n;

◆ Measurement accuracy: current 0.5 level & voltage 0.5 level;

◆ Protection action time: Under 1.5 times the set value, the inherent protection action time is no more than 35ms;

◆ Open circuit: DC 24V, 5mA (provided inside the device);

◆ Open contact: can continuously connect AC/DC220V, 5A current (pure positive load).

Insulation resistance, dielectric strength and impulse voltage

◆ Insulation resistance: ≥50MΩ;

◆ Dielectric strength: 2KV, 50Hz, 1min;

◆ Impact voltage: 5KV, (1.2/50) μs.

Vibration, shock, collision

◆ Vibration: Comply with the relevant provisions of 3.2.1 and 3.2.2 in IEC 60255-21-1.

◆ Impact: Comply with the relevant provisions of 4.2.1 and 4.2.2 of GB/T14537-1993.

◆ Collision: Comply with the relevant provisions of 4.3 of GB/T14537-1993.

Anti-electromagnetic interference performance

◆ Able to withstand frequencies of 1MH and 100KHz, voltage amplitudes of 2500V common mode and 1000V differential mode;

◆ Attenuated shock wave pulse interference test;

◆ Able to withstand the electrostatic discharge test of IEC1000-4-2 standard lV level and test voltage 8kV;

◆ Able to withstand the radiated electromagnetic field interference test of EC1000-4-3 standard level III and interference field strength of 10V/m;

◆ Able to withstand the 1V level fast transient interference test of IEC1000-4-4 standard;

◆ Able to withstand the severe level III surge immunity test specified in GB/T14598.18-2007.

Overload capacity

◆ 2 times rated current: continuous operation;

◆ 10 times rated current: 16S;

◆ 20 times rated current: 1S.