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SICROWBAR AC overvoltage protection производства Siemens

SICROWBAR AC overvoltage protection

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
(for installation altitudes up to 2 000 m above sea level) 1)

725 V AC for rated supply voltage 400 ... 725 V
1 200 V AC for rated supply voltages of 850 ... 1 150 V

Installation altitude

≤ 2 000 m above sea level

Permissible ambient temperature

 
  • In operation

+5 ... +55 °C

  • In storage

-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

  • Disconnector closed, all fuse links OK

1/2 closed, 1/4 opened

  • Disconnector closed, one or several fuse links defective

1/4 closed, 1/2 opened

  • Disconnector open

1/4 closed, 1/2 opened

  • Maximum switching capacity

50 Hz 250 V AC, 3 A
30 V DC, 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
VRRM_05

V

864

1 056

1 248

1 440

Max. limit voltage of BOD element at 55 °C
VRRM_55

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
(data sheet value × 2 for 2 series-connected varistors) VV

V

720

 

860

 

Max. energy (for 2 ms) at TA = 85 °C
(data sheet value × 2 for 2 series-connected varistors) W0

Ws

600

 

720

 

Energy that can be absorbed 100 times
(determined from the derating data) W2

Ws

350

 

419

 

Energy that can be absorbed 10 000 times
(determined from the derating data) W4

Ws

42

 

50

 

Version

 

A

   

Dimensions

     
  • Width

mm

265

   
  • Height

mm

385

   
  • Depth

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
VRRM_05

V

1 728

2 208

2 400

2 592

2 784

Max. limit voltage of BOD element at 55 °C
VRRM_55

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
(data sheet value × 2 for 2 series-connected varistors) VV

V

1 240

1 500

 

1 820

 

Max. energy (for 2 ms) at TA = 85 °C
(data sheet value × 2 for 2 series-connected varistors) W0

Ws

2 400

3 300

 

3 000

 

Energy that can be absorbed 100 times
(determined from the derating data) W2

Ws

986

1 196

 

1 027

 

Energy that can be absorbed 10 000 times
(determined from the derating data) W4

Ws

145

176

 

214

 

Version

 

B

C

   

Dimensions

      
  • Width

mm

580

    
  • Height

mm

305

    
  • Depth

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.
For mounting in an upright position on panels in cabinets or machine frames. 

B

Up to 725 V

Mounted on a baseplate.
For installation in 600 mm wide cabinets.

C

Up to 1 150 V

Mounted on a baseplate.
For installation in 600 mm wide cabinets.


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.

Notes on selection

The following conditions should be maintained when selecting the overvoltage protection:

  • The limit voltage of the overvoltage protection VRRM55 must not exceed the highest periodic and permissible peak blocking voltage of the power semiconductor to be protected.
  • The rated supply voltage of the overvoltage protection must not be exceeded.
  • Commutation overvoltages of the converter that periodically occur must remain below the response voltage of the overvoltage protection. The energy absorption capability of the selected overvoltage protection should be checked. A distinction must be made between two operating cases:
    • A transformer is shut down under no-load conditions
    • A transformer is shut down under load

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
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