Detailed introduction：

Product description

In the power system, ferroresonance frequently occurs, will produce over-voltage resonance, a serious threat to system security. Ferroresonance overvoltages can occur in any system of 3-220 kV, and in particular in the 35 kV and below grid, almost all internal overvoltage events are caused by ferroresonance. The overvoltage caused by ferroresonance has a long duration and may even be present for a long time. In the sub-resonant, the general over-voltage is not high, but PT's current, easy to PT overheating and explosion, fundamental and harmonic resonance, the general current is not large, but the high voltage, often the equipment insulation damage , Resulting in a vicious accident. SMG-1 00 computer harmonic elimination device is developed by our company's new intelligent power resonance elimination device, easy to use, no maintenance, can quickly eliminate the frequency of ferromagnetic resonance, high accuracy. At the same time according to user needs to print the relevant information or through the communication interface to the superior monitoring system for unattended substation.

Features

○ Suitable for all kinds of voltage levels of distribution network.

○ Up to four bus bars can be monitored.

○ quickly eliminate the three-frequency, two-frequency, power frequency and frequency characteristics such as the ferromagnetic resonance frequency.

○ Can distinguish between external overvoltage, ferroresonance and single-phase earthing.

○ The use of high-power, non-contact harmonic elimination components, harmonic elimination quickly and reliably.

○ Provide a group of missed alarm nodes.

○ The fault report (type, time, voltage value and frequency) can be displayed when a fault occurs.

○ Optional micro-printer can print the fault report in time.

○ Configurable communication interface to the relevant information to the superior monitoring system.

○ Save the ten most recent fault information, data is not lost after power failure.

○ Hardware watchdog circuit to prevent crash phenomenon.

○ has a perfect self-test function.

○ man-machine interface is simple and convenient, full Chinese menu, display information rich and intuitive.

The main technical parameters

○ Indoor use, ventilation should be good.

○ Ambient temperature: -10 ℃ - +55 ℃

○ relative speed: less than 90%. No condensation on the surface

○ Atmospheric pressure: 80 ~ 110Kpa

○ Altitude: <2000m.

○ No conductive dust and corrosive gases, molds, etc. which cause metal damage or insulation damage.

○ Power supply: AC / DC: 220V (if there are special requirements, please specify when ordering), power consumption ≤ 20W

○ Alarm node capacity: AC250V, 5A; DC30V, 5A

○ Communication Interface: RS232 / 485 (optional one, please specify when ordering)

Baud rate 1200 - 9600bps

○ Communication protocol: built-in three communication protocol CM90, CDT, MODBUS

Working principle

There are many iron core inductance components in the power system, such as transformer, voltage transformer, arc suppression and shunt compensation reactor, mostly non-linear components, it and the system capacitance composed of many complex oscillation circuit, if meet certain conditions, Can stimulate a longer duration ferromagnetic resonance over-voltage. The occurrence of ferroresonance when the higher over-voltage and large over-current easily make electrical equipment, insulation damage,

Serious circumstances endanger the safety of operating personnel.

SMG-100 computer harmonic elimination device real-time monitoring voltage transformer PT open triangle voltage and frequency When ferroresonance occurs, the device instantly start non-contact harmonic elimination components, resulting in strong resistance, thus eliminating ferromagnetic resonance.

Outline and hole size (mm)