Middle Cabinet Protection
Device Features
- It adopts fully sealed structure, which has good shock resistance and dustproof performance
- Miniaturized design, small size, light weight, beautiful appearance, easy installation
- Using a unique reliability design, no adjustable components, good device stability and strong anti-interference
- Fully Chinese LCD display, the man-machine interface is clear and easy to understand, and the operation and setting are extremely convenient
- The power supply and control circuit of the device are both AC and DC
- It has RS485 bus serial communication port, and integrates MODBUS and IEC60870-103 standard communication protocol.
- It has the function of event sequence recording, which can record 128 events, and the data will not be lost when power off
- It has a complete self-checking function, complete abnormal records, event records, operation records, and all information is retained after power failure
- The shape is small and fine, the structure is reasonable, the use of high-grade, high-quality components and multi-layer board technology and SMT technology, so that the product has high electrical performance
- Ultra low power consumption
The main function
| Feature name | Have | |
| Protective function | Quick break protection |
√ |
| Overcurrent stage I protection |
√ |
|
| Overcurrent stage II protection |
√ |
|
| Inverse time limit protection |
√ |
|
| overload protection |
√ |
|
| Zero sequence overcurrent stage I |
√ |
|
| Zero sequence overcurrent stage II |
√ |
|
| Zero sequence overcurrent stage III |
√ |
|
| Rear acceleration protection |
√ |
|
| Reclosing |
√ |
|
| Overvoltage protection |
√ |
|
| Loss of pressure protection |
√ |
|
| Zero sequence overvoltage protection |
√ |
|
| Startup time is too long |
√ |
|
| Negative sequence overcurrent stage I |
√ |
|
| Negative sequence overcurrent stage II |
√ |
|
| Overheating protection |
√ |
|
| PT disconnection check |
√ |
|
| CT disconnection check |
√ |
|
| Measurement and control function | Ia、Ib、Ic、3I0、UAB、UBC、UCA、U0、P、Q、COS |
√ |
| 10 way remote communication |
√ |
|
| Circuit breaker remote opening, remote closing |
√ |
|
| hardware resources | 10 switch inputs |
√ |
| Closing relay, opening relay, alarm exit relay, accident exit relay |
√ |
|
| Analog Inputs: Ia, Ib, Ic, 3I0, UAB, UBC, UBC, U0 |
√ |
|
| 1 channel RS485 communication |
√ |
Appendix: Protection Dimensional Drawings
Product terminal definition diagram
Application
|
product name |
product model |
basic function |
remarks |
|
|
Medium-sized microcomputer protection |
NLK700 |
Ring network cabinet overhead line, cable line, transformer, motor, capacitor PT cabinet and other primary setting to provide perfect protection function. |
Open hole is 154*123mm |
|
|
line protection |
NLK710 |
|
breaking protection Limit speed break protection overcurrent protection excess voltage protection undervoltage protection overvoltage crowbar undervoltage protection Three-phase primary reclosing Speed up after the overlapping gate Zero order voltage protection |
Open hole is 154*123mm |
|
Enter the line for self-investment protection |
NLK711 |
Open hole is 154*123mm |
||
|
Transformer protection |
NLK720 |
Open hole is 154*123mm |
||
|
motor protection |
NLK730 |
Open hole is 154*123mm |
||
|
Capacitor protection |
NLK740 |
Open hole is 154*123mm |
||
|
Bus voltage monitoring |
NLK750 |
Open hole is 154*123mm |
||
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