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Product Introduction
The KNW1 series universal circuit breaker for grid-connected photovoltaic systems is suitable for photovoltaic power distribution networks with AC 50Hz, rated operating voltage of AC400V or AC690V, and rated current of 6300A and below. High Capacity Breakers Air Circuit Breaker This type of device is used to distribute electrical energy and protect lines and power equipment from overload, undervoltage, short circuit, and single-phase grounding faults; it can also be used as a disconnecting switch. High Capacity Breakers Air Circuit Breaker This circuit breaker features intelligent protection functions, precise selective protection, improved power supply reliability, and avoids unnecessary power outages.
The circuit breaker, as a High Capacity Breakers Air Circuit Breaker, can achieve undervoltage delayed tripping, avoiding power system fluctuations and sudden drops. It ensures that when grid voltage fluctuates, the photovoltaic power source does not immediately disconnect from the grid, maximizing the supporting role of distributed photovoltaic power sources in the grid and allowing users to obtain maximum economic benefits. High Capacity Breakers Air Circuit Breaker models like the KNW1 series are ideal for such demanding applications.
The basic parameters of the circuit breaker are shown in Table 1
|
Rated Current In (A) |
Rated Voltage Ue (V) |
Ultimate Short-Circuit Breaking Capacity Icu (kA) |
Service Short-Circuit Breaking Capacity Ics (kA) |
Rated Short-Time Withstand Current Icw (kA) (1s) |
Arcing Distance (mm) |
|||
|
400V |
690V |
400V |
690V |
400V |
690V |
|||
|
200, 400, 630, 800, 1000 |
50Hz |
42 |
25 |
30 |
20 |
30 |
20 |
0 |
|
400, 630, 800, 1000, 1250, 1600, 2000 |
80 |
50 |
65 |
40 |
65 |
40 |
||
|
2000, 2500, 2900, 3200 |
100 |
65 |
80 |
50 |
80 |
50 |
||
|
3200, 3600, 4000 |
100 |
65 |
80 |
50 |
80 |
50 |
||
|
4000, 5000, 6300 |
120 |
80 |
120 |
80 |
120 |
80 |
||
Note: 4000*A is the capacity-enhanced version of 3200A.
|
Parameter |
Value |
|
Undervoltage release setting (V) |
<20% Un |
|
Under-voltage setting (V) |
20%~70% Un |
|
Undervoltage delay time (s) |
0~10 |
|
Voltage check for closing (with voltage present) (V) |
85% Un |
|
Closing time (s) |
20~60 |
Table 3 shows the derating factor of the circuit breaker at different altitudes.
|
Altitude (m) |
Power Frequency Withstand Voltage (V) |
Max Rated Operating Voltage (V) |
Correction Factor for Operating Current |
Correction Factor for Circuit Breaker Breaking Capacity |
|
2000 |
3500 |
690 |
1 |
1 |
|
3000 |
3500 |
690 |
0.93 |
0.93 |
|
4000 |
3000 |
690 |
0.88 |
0.71 |
|
5000 |
2200 |
560 |
0.82 |
0.63 |
Table 4 shows the derating factor of the circuit breaker under different ambient temperatures.
|
Ambient Temperature |
+40℃ |
+45℃ |
+50℃ |
+55℃ |
+60℃ |
+70℃ |
|
Allowable Continuous Operating Current |
1In |
0.95In |
0.89In |
0.85In |
0.78In |
0.63In |
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