Detailed introduction：

Product description

SMG-200 series microcomputer protection device is a new generation of microprocessor-based relay protection equipment developed by our company in order to meet the miniaturization requirement of modern switchgear cabinet. It is an overhead line, cable line, transformer, motor, capacitor and so on of 35KV and below voltage level. PT and other primary equipment to provide complete protection. Product appearance has been carefully designed, small and exquisite, can be directly installed in the solid cabinet counters and other small space ring switch cabinet.

Features

○ using the latest high-integrated single-chip development platform, the bus does not chip, anti-jamming performance.

○ A unified hardware framework, software platform, product consistency.

○ The device is fully sealed aluminum alloy structure, anti-interference ability, small size, the installation is very simple.

○ The protection function is flexible and complete, and various protection functions can be inputted through the control word.

○ Analog input, digital input, power input and communication interface part of the transformer isolation, optical isolation, TVS protection of anti-interference measures, making the device particularly strong anti-interference ability.

○ The device has a perfect self-test function, when the device is not working properly when the latch to protect the export to ensure that the device does not malfunction.

○ Using a dedicated clock chip, supported by a separate crystal, with a backup battery, the clock even in the device after power-down can correctly travel, so that the device can accurately record a variety of fault information.

○ device has three watchdog, external hardware watchdog, CPU hardware timer watchdog and software watchdog, to ensure that the device in any case will not crash.

○ high-speed optical isolation RS485 communication interface, communication is stable and reliable, and to provide users with an open communication protocol to facilitate the realization of integrated automation system.

○ Modular design of the software in the device, with a variety of redundancy measures, and after a long period of on-site operation test, the program is stable and reliable operation.

○ Full Chinese LCD display interface, multi-layer menu display, display information-rich, friendly man-machine interface, without the need for complex training to complete the debugging work.

Technical Parameters

○ Main electrical technical parameters

○ Power supply: AC / DC85 - 265V

○ Allowable deviation: ± 20%. Ripple factor is not more than 5%.

○ AC current: rated 5A or 1A (specified when ordering)

○ AC voltage: 57.7V or 100V (specify when ordering)

○ Rated frequency: 50Hz

○ Power consumption: DC circuit is not big 5w. AC circuit is not big 0.5VA

○ Accurate measurement range: phase current 0.1ln ~ 20ln

○ Zero sequence current: 0.1A ~ 6.25A

○ Voltage: 5V ~ 160V

○ Measurement Accuracy: Current 0.5, voltage 0.5

○ Protection action time: 1.5 times the value of the protection that the inherent action time is not much dry 35ms

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

○ open contact: can be continuously connected AC / DC220V, 5A current (purely positive load)

○ Insulation resistance, dielectric strength and impulse voltage

○ Insulation resistance: ≥50MΩ

○ Dielectric strength: 2KV. 50Hz. 1 min

○ Impulse voltage: 5KV, (1.2 / 50) μs

○ Overload capacity

○ 2 times the rated current: continuous work

○ 10 times the rated current: 16S

○ 20 times the rated current: 1S

○ Working conditions

○ Ambient temperature: -20 ℃ - +60 ℃

○ relative humidity: 5% - 95%.

○ Atmospheric pressure: 86 - 106KPa

○ Vibration

○ According to IEC60255-21-1 3.2.1, 3.2.2 of the relevant provisions.

○ Shock

○ comply with the relevant provisions of GB / T14537-1993 in 4.2.1,4.2.2.

○ Collision

○ According to 4.3 of GB / T14537-1993.

○ anti-electromagnetic interference performance

○ can withstand the frequency of 1MH and 100K1-1z, voltage amplitude common mode 2500V, differential mode 1000V

○ attenuation of the shock wave pulse interference test

○ can withstand IEC1000-4-2 standard lV level, the test voltage of 8kv electrostatic discharge test

○ can withstand IEC1000-4-3 standard ... level, the interference field strength of 10V / m radiation electromagnetic interference test

○ can withstand IEC1000-4-4 standard lV-level rapid transient interference test

○ Surge immunity test capable of withstanding severity class G / T14598 18-2007

 

Protection device selection table

 

 

Integrated microcomputer protection schematic diagram

 

Circuit Protection Schematic

 

Station with the protection of the schematic diagram

 

 

Schematic diagram of induction motor protection

 

 

Capacitor Protection Schematic

 

 

Schematic diagram of automatic switching device for standby power supply

 

 

Schematic diagram of line backup protection

 

 

Schematic diagram of voltage transformer monitoring device