Siemens Vacuum Recloser 3AD

Description

Siemens has more than 40 years of experience in vacuum switching technology and is a leader in the field of numerical protection technology. The 3AD recloser combines cutting-edge technology with quality engineering expertise in relay protection schemes for which Siemens is known.

Siemens reclosers meet all the requirements for outdoor use in accordance with the recloser standards IEEE C37.60 and IEC 62271-111.

Reclosers are used in overhead lines and in substations. Like circuit-breakers they are capable of switching normal and fault currents. The recloser consists of two main components: The switch unit, where Siemens offers its customers two designs, 12 ‒ 27 kV and 38 kV, and the controller as protection and control unit. The latter is located inside the control cubicle (CC), which also contains the electronics and auxiliary circuits. The control cubicle is also available in two different designs depending on the chosen controller.

The 7SR224 controller based on the Siemens Reyrolle protection relay family provides protection, control, monitoring, measuring and metering with integrated input and output logic, data logging, as well as fault reports. Communication access to relay functionality is via a front USB port for local PC connection or a rear electrical RS485 port for remote connection. Additional rear port options including RS232 and optical ports are available. Access to the user level menus and data is protected by multilevel password authentication.

As a second controller version, Siemens offers its customers the SIPROTEC 7SC80, which is ready for smart grids and therefore supports the integration of your medium-voltage grid. The integrated programmable logic (CFC) allows the user to add his own functions, e.g. for the automation of medium-voltage grids. Local communication with a PC is possible via the USB-DIGSI interface at the front, and also via network communication protocols. Furthermore, the 7SC80 controller offers a web-based HMI for local and remote access to the recloser in order to monitor measured values and indications, as well as to perform switching operations.

  • Rated voltage up to 38 kV

  • Factory engineered, pre-assembled and wired accessories for easy on-site installation

  • Advanced vacuum switching technology

  • Fully integrated current transformers (CTs) and voltage sensors

  • Dual-coil, low-energy magnetic actuator

You will find more detailed information in the recent catalog indicated on the right side of this page.

Technical Data

Rated continuos current

200 A; 400 A; 630 A; 800 A

Rated voltage according to ANSI C37.60

12 kV; 15.5 kV; 24 kV; 27 kV; 38 kV

Rated short-circuit breaking current

12.5 kA; 16 kA

Rated lightning impulse withstand voltage

75 kV; 110 kV; 125 kV; 150 kV; 170 kV; 195 kV*

Recloser sequence

0–0.2s...14,400s - CO–2s...14,400s–CO–2s...14,400s–CO– lockout

Opening time

< 35 ms

Closing time

< 60 ms

Number of operating cycles

10,000

Number of short circuit operations

Design 27: 50 short-circuit interruptions at 100% = 12.5 kA
Design 38: 35 short-circuit interruptions at 100% = 16 kA

Number of phases

Three-phase, single-phase, single-triple

Degree of protection

IP55

Site altitude

UP to 1,000m, above sea level. Up to 4,000m with derating

Ambient air temperature

- 30°C … + 55°C, optional - 40°C… + 50°C

Standards

IEEE C37.60/IEC 62271-111; IEC 60068; IEC 61109; IEC 60529

* on request

3-Phase

Rated voltage (kV)

Rated short-circuit
breaking current (kA)

Rated lightning impulse withstand
voltage (kV)

Rated normal Current 
200 A   400 A  630 A   800 A

12

12.5
16

75
75

  □
  -


-



15.5

12.5
16

110
110

  □
  -


-



24

12.5
16

125
125

  □
  -


-



27

12.5
12.5
16
16

125
150
125
150

  □
  -
  -
  -


-
-
-







38

12.5
16
16*

170
170
195*

  -
  -
  -

-
-
-






Design 27
Design 38

1-Phase

Rated voltage (kV)

Rated short-circuit
breaking current (kA)

Rated lightning impulse withstand
voltage (kV)

Rated normal Current 
200 A   400 A  630 A   800 A

12

12.5
16

75
75

  -
  -

  ■
  -



15.5

12.5
16

110
110

  -
  -

  ■
  -



24

12.5
16

125
125

  ■
  -

  ■
  -



27

12.5
16

125
125

  ■
  -

  ■
  -



* on request


Dimensions

Rated voltage Ur

12 kV up to 38 kV

Control cubicle weight

66 kg

Switch unit weight

65 - 120 kg

 
Sample
Control cubicle

Dimensions 3AD

Dimensions 3AD

Dimensions 3AD

Dimensions 3AD

Benefits

  • High-performance portfolio for up to 16 kA short-circuit breaking current and a rated operating voltage of up to 38 kV

  • Uniform design for all applications single, single triple, and three-phase

  • Large number of protection, metering, and monitoring functions including loop automation

  • Completely programmable via menu (not only PC)

  • Large Number of communication protocols