One.Overview
When single-phase grounding in power system, due to the fault current is small, and because the system still symmetric three-phase voltage does not affect the normal power supply, the load of general allowed to continue with faults run 1 to 2 hours. But in the long run, due to the double voltage increase of non-fault, it may cause the weak link of insulation to be puncture, and the development becomes interphase short circuit, which causes the accident to expand greatly.
Jt-wx series microcomputer small current grounding device, which can be picked up accurately and quickly when single phase grounding system occurs.
Ground or bus lines. Simple and easy to use, without maintenance, the relevant information can be passed to the user according to the user's need.
Level monitoring system for unattended substation.
Two.Functional features
1. The new hardware system is designed with dual CPU structure, and the program function distribution is more reasonable and the operation is more stable.
2. Up to four bus bars can be monitored;
3. Earthing circuit or bus can be selected when single phase grounding;
4. Using the wavelet analysis method of transient process and the harmonic analysis method of steady state process, a variety of line selection schemes are provided, further.
The accuracy of line selection is improved.
5. Optional record wave function to record the data of 2 weeks after the failure of 1 week before the failure;
6. Optional printer, can print the relevant information of the failure, easy to see;
7. Optional tripping function, can set the delay or not trip. 8. Optional remote function, to provide remote output signal relay nodes, relay node output signal output can be in the binary code output, BCD code output way either;
9. When the fault occurs, it can display the fault report (type, time, voltage value and frequency), and give the alarm;
10. Easy and integrated automation interface. The rs-232 or rs-485 communication interface is provided, with three communication protocols built in and flexible and convenient to use.
11. The man-machine interface is simple and convenient, with a full Chinese menu, displaying information rich and intuitive;
12. The on-site CT variable ratio and the starting voltage can be set by the software, and the site needs no adjustment.
13. Save 30 recent failure information, and the data is not lost after losing power.
Three. Technical parameters
1. Environment and requirements.
1.1 indoor use, ventilation should be good;
1.2 degrees: - 10 ℃ ~ + 55 ℃;
1.3 degree: less than 90%, with no condensation on the surface;
1.4 force: 80 ~ 110Kpa;
1.5 degree: < 2000m;
1.6 non-conductive dust and corrosive gases, mold, etc. that cause metal or cause insulation damage.
2. Technical parameters
2.1 Numbers: 1 ~ 4 paragraphs;
2.2: no more than 60, the number of lines in parallel operation of each segment is unlimited, and can be combined arbitrarily;
2.3 type: applicable to neutral, arc suppression coil grounding or resistance grounding system;
2.4 type: cable or overhead line;
2.5 flow input range: 20 ~ 1000mA (if greater than time, the order must be declared);
2.6 pressure input range: 0 ~ 120V;
2.7 contact capacity: AC 250V 5A; 30 v DC 5 a;
2.9 frequency: 50Hz;
2.10 < 25 w;
2.11 rs232/485 (please specify in order), the baud rate is 1200 ~ 9600bps;
2.12 built-in three communication protocols CM90, CDT, MODBUS.
Four. Ordering instructions
1. Product model, name and order quantity;
2. Work power rating of the device;
3. Whether it has communication function and specifies the interface form;
4. Other special requirements;
5. If there is any change in this instruction, please do not notify us in advance.
