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Basic Info.
| Model NO. | FZW28-12F |
| Series | Three |
| Structure of Operating | Electric |
| Certification | CE, ISO9001 |
| Brand | Vacem |
| Power Frequency Withstand Voltage | 42/48kV |
| Lightning Impulse Withstand Voltage | 75/85kV(Peak) |
| Rated Short Time Withstand Current | 16kA |
| Rated Cable Charged Breaking Time | 20A |
| Mechanical Life Time | 10,000 times |
| Trademark | VACEM |
| Origin | Wenzhou, China |
1.General description
On the 12kV feeding line, when the error happened at one tributary line of the T type link users, normally it will cause the main line or adjacent users power cut accident, the investing make known this kind of accident takes 20%-30% or higher percentage in all power distribution accident, the result is enlarged power cutting scope and cause responsibility disputation.
Mounted a user boundary load break switch (also name watchdog) at the above T-type connecting point is the ideal solution to the above accident.
2.Main function characteristic
Automatically cut single phase earthing fault: when users tributary line cause single phase earthing fault, the boundary switch will open automatically, other distribution line users of the substation and feeding line will be without influence; isolation interphase short circuit fault automatically.
When the tributary line cause interphase short-circuit fault, boundary switch will open at once after out-wire protection tripping. After the substation reclose, fault line is isolated passively,other distribution users in feeding line resume power supply rapidly (equal to a transient fault).
Quick localization of fault: the tributary line fault cause boundary switch protection action, only the accident user cause power cut and by itself report the fault information, the power company could dispatch worker to life investigation;if the boundary switch match with communication module, it could transmit message to electricity management center.
Monitoring users load, boundary switch could configure wired or wireless communication enclosure to monitor data and transmit to electricity management center,make the achievement of real-time data monitoring of users load in long distance.
Function of network running, it could be used in network lines,function of measurement,monitor voltage,current,frequency and quantity of electricity of lines,and transmit to management center in long distance.Function of harmonic analyzing.to supply reliable basis for pollution administration of electricity net afterwards.
3.Condition of using environment
a.Altitude:≤2000m
b.Relative humidity:≤90%(25℃)
c.Max.wind speed:≤25m/s
d.Ambient temperature:-40℃~85℃
e.Max.day temperature gap:25℃
f.Max.ice-covering thickness:10 mm
4.Main technical parameter
a. Switch body
| Item | Unit | FZW28-12F |
| Rated voltage | kV | 12 |
| Power frequency withstand voltage(phase to phase, to earth/fracture) | kV | 42/48 |
| Lightning impulse withstand voltage(phase to phase, to earth/fracture) | kV | 75/85(peak) |
| Rated current | A | 630 |
| Rated short time withstand current | kA | 16 |
| Rated thermal stability current | s | 2 |
| Rated short circuit making current (peak) | kA | 40 |
| Rated dynamic stability current (peak) | kA | 40 |
| Rated cable charged breaking time | A | 20 |
| Rated switching no-load transformer induction current | A | <5 |
| Mechanical life time | time | 10,000 |
b. Controller
| Item | FDR-100(CH-40) |
| Input operation voltage | AC220±20% |
| Input operation voltage frequency | 50Hz |
| Output voltage (opening) | DC220V,DC48V |
| Inter-phase short circuit protection current setting value | 0.2,0.4,0.6,0.8,1.0,A5 section switching |
| Earthing protection zero-order current setting value | 10~200mA 20 section switching, differential 10mA |
| Earthing protection time setting value | 0.2,0.4,0.6,0.8,1.0,S6 section switching |
| Setting value error | ±5% |
| Insulation impedance (outer terminal to earth input terminal, to output terminal) | >100MΩ/DC500V |
| P.F. withstand voltage (outer terminal to earth input terminal, to output terminal) | 2000V/1min |
| Impulse withstand voltage(outer terminal to earth input terminal, to output terminal) | 5000V, 1.2/50μ each 3 times of plus and minus |
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