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NGD-820Small current grounding protection device
NGD-820 low current grounding protection device for small current system refers to the non direct ground neutral system, including neutral non grounding system, neutral point grounding through Petersen coil system or neutral grounding system through high resistance. When the grounding phase occurs in the system, the fault feature is not obvious, which can rapidly, accurately indicate the ground loop to a certain degree of difficulty. This product adopts the new principle, new analysis methods, the line selection accuracy is high, and the line selection without dead. The box type structure, plug-in design, can be conveniently installed in various screen cabinet.
Operating parameters
Bus number: 1~4
Line number: 32 Road (line on every bus can be obtained through setting, every bus up to 32 way line)
Relay type: DC220V/5A, normally open contact, self or non self maintenance
Communication interface: RS-485
PT input saturation voltage: 120V
CT input saturation current: 1A
Action voltage setting range: 30~80V, range: 10V
The export type setting: alarm or export
Power supply: AC220V or DC220V, 50Hz
Device power consumption: <30W
Operating environment
Storage temperature: - 25 ℃ ~ 70 ℃
Working temperature: 20 ℃ ~ 55 ℃
Relative humidity: the maximum not exceeding 90%
Atmospheric pressure: 80 ~ 110KPa, the relative altitude below 2KM
The insulation performance:
According to IEC255-5, GB/T15145-94 standard
Anti interference ability strong line selection
The grounding grid size according to the grounding current will be different, and even the existence of up to two times the side only a few mA,
In this case the unbalanced current and various interference will affect the line selection,
Due to the adoption of the new analysis method, this effect is reduced to the minimum, has almost no effect on the product line selection.
Fault display rich
In addition to the normal display of bus line, grounding and grounding are adopted to keep time, display fault information,
Display until after the troubleshooting of zero sequence voltage drop after the lifting of display.
At the same time, the fault of other bus fault in the use of stack processing, the fault display in the new information.
When failure to lift automatically checks a fault latest is removed, if not display.
System is running stable
The design of the system has two processors, which are used to deal with the fault line selection and liquid crystal display and communication,
The system is rich in resources do not conflict, so as to make the system run fast and stable.
LCD interface simple rich
Products with a large LCD, 138*64mm, let people can more easily understand the product information.
Equipped with automatic backlight, reduce power consumption increase the LCD life. Interface design is not perfect, make people easy to understand.
Export diversity
According to the need to choose the action type is export driven trip, or the overall alarm.
Also can choose the type of relay based on selecting the trip, used to drive a different circuit.
Set the value of a simple
The analysis object principle of for transient grounding transient zero sequence voltage, thus starting the requirement is not high,
Without precise calculation of grounding voltage value, as long as the guarantee that the minimum starting voltage can be introduced later, see the specific requirements.
Bus number: 1~4
Line number: 32 Road (line on every bus can be obtained through setting, every bus up to 32 way line)
Relay type: DC220V/5A, normally open contact, self or non self maintenance
Communication interface: RS-485
PT input saturation voltage: 120V
CT input saturation current: 1A
Action voltage setting range: 30~80V, range: 10V
The export type setting: alarm or export
Power supply: AC220V or DC220V, 50Hz
Device power consumption: <30W
Operating environment
Storage temperature: - 25 ℃ ~ 70 ℃
Working temperature: 20 ℃ ~ 55 ℃
Relative humidity: the maximum not exceeding 90%
Atmospheric pressure: 80 ~ 110KPa, the relative altitude below 2KM
The insulation performance:
According to IEC255-5, GB/T15145-94 standard
Anti interference ability strong line selection
The grounding grid size according to the grounding current will be different, and even the existence of up to two times the side only a few mA,
In this case the unbalanced current and various interference will affect the line selection,
Due to the adoption of the new analysis method, this effect is reduced to the minimum, has almost no effect on the product line selection.
Fault display rich
In addition to the normal display of bus line, grounding and grounding are adopted to keep time, display fault information,
Display until after the troubleshooting of zero sequence voltage drop after the lifting of display.
At the same time, the fault of other bus fault in the use of stack processing, the fault display in the new information.
When failure to lift automatically checks a fault latest is removed, if not display.
System is running stable
The design of the system has two processors, which are used to deal with the fault line selection and liquid crystal display and communication,
The system is rich in resources do not conflict, so as to make the system run fast and stable.
LCD interface simple rich
Products with a large LCD, 138*64mm, let people can more easily understand the product information.
Equipped with automatic backlight, reduce power consumption increase the LCD life. Interface design is not perfect, make people easy to understand.
Export diversity
According to the need to choose the action type is export driven trip, or the overall alarm.
Also can choose the type of relay based on selecting the trip, used to drive a different circuit.
Set the value of a simple
The analysis object principle of for transient grounding transient zero sequence voltage, thus starting the requirement is not high,
Without precise calculation of grounding voltage value, as long as the guarantee that the minimum starting voltage can be introduced later, see the specific requirements.
