Audited Supplier
NR-320
Microprocessor Protection Device
Mechanical Structure Type
for Switchgear
Digital Type
Integration
/
IP20
GB
Customized
OEM & ODM
Carton
As standard drawing
China
8538900000
Product Description
| NR-320 Self powered microcomputer protection and measurement device | vertical installation |
| NR-321 Self powered microcomputer protection and measurement device | horizontal installation |
Applicable scope
The NR-320series self powered microcomputer protection and monitoring device is specifically developed for system application such as box transformer, ring network cabinet and small switchgear. It can be integrated into circui tbreaker cabinet or load switch+fuse cabinet for use. The phase overcurrent protection, zero sequence overcurrent protection and external contact direct tripping function with multiple action characteristic curves can be applied to protection occasions such as bus, line, distribution transformer, motor, capacitor, etc.
Dimension:
| overall dimension | opening dimension | |
| NR-320 | 71mm (width)*160mm(height)*115mm (depth) | 72mm(width)*148mm(height) |
| NR-321 | 71mm (width)*160mm(height)*115mm (depth) | 72mm(height)*148mm(width) |
Function setting
1.Two-section definite time limit overcurrent protection, inverse time limit overcurrent protection
2. Definite time limit zero sequence overcurrent protection, inverse time limit zero sequence overcurrent protection
3.External contact direct tripping, high current blocking tripping
4.Passive trip output(direct drive trip coil)
5. RS-485 communication interface
Working environment condition
Environmental temperature: -20ºC ~+55ºC
Relative humidity: 5%~95%
Atmospheric pressure: 80kPa~110kPa (below 2000M altitude)
Other conditions: The air around the device should not contain substances with acid, alkali corrosion or explosive
properties, and should be free of lightning, rain and snow
Standard atmospheric conditions for the test: temperature +15~+35ºC , humidity 45%-75%, air pressure 86~106kPa
Rated electrical parameter
Measuring voltage: AC380V (direct measurement), AC100V (PT measurement)
Measuring current: 1~300A (direct measurement),5A (CT measurement)
Rated frequency: 50Hz
Working power supply: AC/DC 100~265V
Device characteristics
1.The entire machine adopts extremely low-power design technology, ensuring reliable and fast startup of the protection function under any condition.
2.The device has simple and compact structure, convenient and flexible installation, and is suitable for compact
installation conditions of ring main unit.
3.A self powered function(powered by a current transformer) can be selected to avoid the additional burden caused by installing DC screen or UPS.
4.The protection configuration is flexible and complete, and various protection functions can be freely switched on or off through the interface menu.
5.Multiple IEC standard inverse time limit curve selection. Equipped with high current blocking protection function,it's suitable for use with various fuses to solve the problem of dead zone protection in distribution system.
6.It adopts Chinese and English LCD display interface, with multi-layer menu display, and the human-machine
interface is extremely friendly.
7.The device is equipped with a large capacity non volatile memory to ensure the storage of 100 historical event records, with detailed recording content and no data loss during power failure.
8.The device has a comprehensive dynamic and static self-inspection function, which monitors the working
conditions of various parts of the device online, ensuring the reliability of the device's operation.
9.High precision components and processes ensure the accuracy, reliability and long service life of the device.
10.The device provides panel debugging RS-232 communication port, as well as optional rear terminal RS-485 communication bus interface, and it provides users with open communication protocol to facilitate the implementation of SCADA functions.
Instructions for use
Self powered CT generally uses the measurement winding of current transformer without accuracy requirement, but the output capacity of the transformer should be considered-the starting power of the device is 0.2VA.
Power CT parameter:
When the primary current is 10% of the CT rated current, the CT secondary output is ≥12V.
When the primary current is 50% of the CT rated current, the CT secondary output is ≥25V.
When the primary current is 100-200% of the CT rated current, then 25V≤CT secondary output<30V.
When the primary current is greater than 100% of the CT rated current, the CT secondary open circuit voltage is<40V.
Please indicate the system power frequency, secondary rated current value, operating voltage(DC24V or DC220V),
communication interface and other parameters when ordering.
COMPANY PROFILE:
Zhejiang Anhuang Imp & Exp. Co .. Ltd. We provide high quality, low cost products for utility systems worldwide
Company constantly introducing new technology,newcraft, the product structure constantly improved.Our Professional
production testing equipment.special production technology and professional service team can satisfy the customers demand.
Our professioal engineers,technicansand managers team always keep our promise:ANHUANG is not only provide cost-effective high quality products.but also provide high quality, efficient, fast service and technical support to ensure customers' require.
Our company obtained international quality management system ccertification for ISO9001,ISO1401,OHSAS18001.
Our company adhenring to the "safety electricity, forever brilliant " as our enterprise's humanism. Willing to work with you hand in hand to build better future
