;
SICROWBAR AC overvoltage protection is used to protect power semiconductors (thyristors and diodes) in converters against overvoltages between the phases of a three-phase line supply. The range of applications is not restricted to protecting DC drive converters, but can also be used for infeed/regenerative feedback units of AC drive systems that are equipped with thyristors. Overvoltages that occur on the AC side of converters are mainly caused by switching operations when disconnecting from the line supply at the transformer primary. This applies both to operational switching operations (shutdown under no-load conditions) as well as in the case of a fault (shutdown under load).
Overvoltage protection is normally used in the following configuration:
General technical data | SICROWBAR AC overvoltage protection |
---|---|
Degree of protection | IP00 acc. to EN 60529 |
Protection class | I according to EN 50178 |
Overvoltage category | III, corresponding to EN 60664 |
Dimensioning creepages and clearances | Pollution degree 2 acc. to EN 50178 |
Rated insulation voltage | 725 V AC for rated supply voltage 400 ... 725 V |
Installation altitude | ≤ 2 000 m above sea level |
Permissible ambient temperature | |
| +5 ... +55 °C |
| -40 ... +70 °C |
Climate class | 3K3 acc. to EN 60721-3-3 |
Fuse monitoring (microswitch at the fused disconnector, 1 changeover contact) | Flat connector 6.3 mm × 0.8 mm |
| 1/2 closed, 1/4 opened |
| 1/4 closed, 1/2 opened |
| 1/4 closed, 1/2 opened |
| 50 Hz 250 V AC, 3 A |
1) Installation altitudes above 2 000 m on request.
|
| SICROWBAR AC overvoltage protection | |||
---|---|---|---|---|---|
|
| 7VV3002‑3CD20 | 7VV3002‑3AD20 | 7VV3002‑3BD20 | 7VV3002‑3GD20 |
Max. permissible rated supply voltage VN | V | 460 | 550 | ||
Nominal response voltage of the BOD element VAN | V | 1 000 | 1 200 | 1 400 | 1 600 |
Min. limit voltage of BOD element at 5 °C | V | 864 | 1 056 | 1 248 | 1 440 |
Max. limit voltage of BOD element at 55 °C | V | 1 166 | 1 378 | 1 590 | 1 802 |
Max. permissible peak current, Imax | A | 200 | 1 000 | 2 000 | |
Rated insulation voltage (the insulation voltage is determined by the highest rated supply voltage of the relevant construction type) VISO | V | 550 | |||
Varistor voltage (breakdown voltage) at TA = 25 °C, 1 mA | V | 720 | 860 | ||
Max. energy (for 2 ms) at TA = 85 °C | Ws | 600 | 720 | ||
Energy that can be absorbed 100 times | Ws | 350 | 419 | ||
Energy that can be absorbed 10 000 times | Ws | 42 | 50 | ||
Version | A | ||||
Dimensions | |||||
| mm | 265 | |||
| mm | 385 | |||
| mm | 237 | |||
Weight, approx. | kg | 7 |
|
| SICROWBAR AC overvoltage protection | ||||
---|---|---|---|---|---|---|
|
| 7VV3002‑3DD20 | 7VV3002‑3ED20 | 7VV3002‑3JD20 | 7VV3002‑3KD20 | 7VV3002‑3LD20 |
Max. permissible rated supply voltage VN | V | 770 | 920 | 1 100 | ||
Nominal response voltage of the BOD element VAN | V | 1 900 | 2 400 | 2 600 | 2 800 | 3 000 |
Min. limit voltage of BOD element at 5 °C | V | 1 728 | 2 208 | 2 400 | 2 592 | 2 784 |
Max. limit voltage of BOD element at 55 °C | V | 2 120 | 2 650 | 2 862 | 3 074 | 3 286 |
Max. permissible peak current, Imax | A | 300 | 800 | 1 000 | 400 | 1 000 |
Rated insulation voltage (the insulation voltage is determined by the highest rated supply voltage of the relevant construction type) VISO | V | 770 | 1 100 | |||
Varistor voltage (breakdown voltage) at TA = 25 °C, 1 mA | V | 1 240 | 1 500 | 1 820 | ||
Max. energy (for 2 ms) at TA = 85 °C | Ws | 2 400 | 3 300 | 3 000 | ||
Energy that can be absorbed 100 times | Ws | 986 | 1 196 | 1 027 | ||
Energy that can be absorbed 10 000 times | Ws | 145 | 176 | 214 | ||
Version | B | C | ||||
Dimensions | ||||||
| mm | 580 | ||||
| mm | 305 | ||||
| mm | 205 | 245 | |||
Weight, approx. | kg | 11 | 12 |
There are three device versions depending on the rated voltage:
Version | Rated voltage | Design, installation |
---|---|---|
A | Up to 580 V | Mounted in an enclosure. |
B | Up to 725 V | Mounted on a baseplate. |
C | Up to 1 150 V | Mounted on a baseplate. |
The power section of the overvoltage protection device has a P3C connection, 3-pulse fully controlled polygon connection. The feeders to the polygon connection have metal-oxide varistors that absorb overvoltage energy.
Semiconductor fuses included in the devices are accommodated in a fused disconnector with integrated fuse monitoring.
The break-over diodes (BOD) and RC snubbers for the thyristors and varistors are mounted on a printed circuit board as are also the gate series resistors and diodes that transfer the line voltage to the break-over diodes.
If an overvoltage occurs, which reaches the response voltage of the integrated firing module, then the break-over diodes trigger and in turn trigger their associated thyristors. As a consequence, the varistors are switched to the line supply. The varistors absorb the overvoltage energy. An RC snubber circuit protects the thyristors against an excessively steep voltage gradient when the current is interrupted.
The following conditions should be maintained when selecting the overvoltage protection:
Detailed notes on configuration, standards and connection of the overvoltage protection are provided in the Operating Instructions, on the DVD-ROM supplied with Catalog D 23.1 or in the Internet under
http://support.automation.siemens.com/WW/view/en/18260008/130000.
Spare parts, see in the Internet under http://workplace.automation.siemens.de/sparesonweb.
Код | Заказной номер | Описание | Вес (кг) | Заказать |
---|---|---|---|---|
119118 | 7VV3002-3AD20 | overvoltage protection module for maximum permissible supply voltage 460v and rated transformer operating voltage 1200v nma: 449411910000 | 10.2 | Заказать |
119119 | 7VV3002-3BD20 | overvoltage protection module for maximum permissible supply voltage 550v and rated transformer operating voltage 1400v nma: 449411910100 | 10.4 | Заказать |
72565 | 7VV3002-3CD20 | overvoltage protection module for maximum permissible supply voltage 460v and rated transformer operating voltage 1000v nma: 449411910200 | 10.3 | Заказать |
119120 | 7VV3002-3DD20 | overvoltage protection module for maximum permissible supply voltage 770v and rated transformer operating voltage 1900v nma: 449411910401 | 11.1 | Заказать |
72566 | 7VV3002-3ED20 | overvoltage protection module for maximum permissible supply voltage 920v and rated transformer operating voltage 2400v nma: 449411910500 | 13.1 | Заказать |
119121 | 7VV3002-3GD20 | overvoltage protection module for maximum permissible supply voltage 550v and rated transformer operating voltage 1600v nma: 449411910300 | 10.4 | Заказать |
119122 | 7VV3002-3JD20 | overvoltage protection module for maximum permissible supply voltage 920v and rated transformer operating voltage 2600v nma: 449411910600 | 17.5 | Заказать |
72567 | 7VV3002-3KD20 | overvoltage protection module for maximum permissible supply voltage 1100v and rated transformer operating voltage 2800v nma: 449411910700 | 19 | Заказать |
119123 | 7VV3002-3LD20 | overvoltage protection module for maximum permissible supply voltage 1110v and rated transformer operating voltage 3000v nma: 449411910800 | 13.4 | Заказать |