The circuit breaker adopts the principle of self-energy arc extinguishing with spring mechanism. When the circuit breaker receives the opening instruction, the rigid components such as cylinder, moving arc contact and tie rod move downward under the action of the spring force of the opening. In the process of movement, the static main contact is separated from the main contact, and the current is transferred to the arc contact, then the arc contact is separated, and the arc is generated between the dynamic and static arc contacts. When short-circuit current is interrupted, the arc energy between arc contacts is large because of the high current value. The arc heat flow is injected into the thermal expansion chamber to exchange heat in the thermal expansion chamber and form low temperature and high pressure gas. At this time, the one-way valve in the arc extinguishing chamber closes because the pressure of the thermal expansion chamber is greater than that of the auxiliary pressure chamber. When the current is zero, the high-pressure gas in the thermal expansion chamber blows back to the fracture to extinguish the arc. When switching off small current (usually below several thousand amperes), because of the small arc energy, the pressure rise in the expansion chamber is slower than that in the auxiliary chamber. The one-way valve opens and the compressed gas in the auxiliary chamber enters the expansion chamber, which produces gas blowing and extinguishes the arc when the current passes zero.
Using self-energy arc extinguishing principle, the operation work is small and the impact is small.
With spring mechanism, the performance of the mechanism has nothing to do with temperature, small wear and stable performance.
The optimized structure of arc extinguishing chamber and contact motion curve have high interruption reliability.
No reburning and re-breakdown occurs when capacitive current is switched off.
The optimized design of pole column and braced frame has high seismic capacity.
It has high reliability, long average trouble-free time and low maintenance cost.
On-site installation and debugging is fast, only 1 to 2 days;
Low operating noise, suitable for residential areas.
| No | Items | unit | parameter | ||
| 1 | Rated voltage | kV | 126 | ||
| 2 | Rated power frequency withstand voltage (1 min) |
Intersection
and opposition |
kV | 230 | |
| Fracture | kV | 230+73* | |||
| 3 | Rated lightning impulse withstand voltage | Intersection and opposition | kV | 550 | |
| Fracture | kV | 550+103* | |||
| 4 | Power Frequency Tolerance Voltage (5min) at SF6 Zero Meter Voltage | kV | 95 | ||
| 5 | Rated Frequency | Hz | 50 | ||
| 6 | Rated current | A | 3150 | ||
| 7 | Rated short circuit breaking current | kA | 40 | ||
| 8 | First open pole coefficient | 1.5 | |||
| 9 | DC Component of Rated Short Circuit Opening Current | 不小于41% | |||
| 10 | Rated short circuit switching current (peak value) | kA | 100 | ||
| 11 | Rated short-term withstand current (RMS) | kA | 40 | ||
| 12 | Rated peak tolerance current (peak) | kA | 100 | ||
| 13 | Rated short circuit duration | s | 4 | ||
| 14 | Rated out-of-step switching-on current | kA | 3(OP1) ,10(OP2) | ||
| 15 | Close-zone fault switching-on current | kA | 36；30 | ||
| 16 | Disconnecting Current of Dissimilar Grounding Fault | kA | 34.8 | ||
| 17 | Rated line charging switching current | A | 31.5 | ||
| 18 | No overhaul full capacity interruption times | 次 | 20（或额定电流开断次数：3000次） | ||
| 19 | Rated operation sequence | O-0.3s-CO-180s-CO | |||
| 20 | Rated Sulfur Hexafluoride Gas Pressure (20 C Meter Pressure) | MPa | 0.6 | ||
| 21 | Alarm/Block Pressure (20 C Meter Pressure) | MPa | 0.55/0.50 | ||
| 22 | Annual leakage rate of SF6 gas | %/Y | ≯0.5 | ||
| 23 | Gas moisture content | Handover Acceptance Value | μL/L | ≯150 | |
| Running allowable value | μL/L | ≯300 | |||
| 24 | Main circuit resistance | μΩ | ≤35 | ||
| 25 | Mechanical life | 次 | 6000 | ||
| 26 | Radio interference level (1.1 Ur)/ | μV | ≯500 | ||
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| 27 | Permissible Partial Discharge Intensity (1.2Ur) | pC | ≤5 | ||
| 28 | Noise (2 m and 1.5 m above the sound source level) | dB | 90 | ||
