Siemens Vacuum Recloser 3AD

Description

Siemens has more than 30 years of experience in vacuum switching technology and is a leader in the field of digital protection technology. The 3AD recloser combines cutting-edge technology with quality engineering experience in relay protection schemes for which Siemens is known.

The Siemens 7SR controller constitutes the brains of the recloser. It comprises indicators and control elements, communication interfaces and a USB port for convenient connection of a laptop computer.

Access to the user level menus and data is protected by multi level password authentication. Along with overcurrent time protection (49 preset curves and multiple user configurable curves), it is equipped for earth fault and sensitive earth fault detection. Inrush restraint and load shedding are further protection functions that help prevent nuisance outages.

The Siemens 7SR controller offers a multitude of inputs and outputs for customer use. Additional communication modules for data transfer are available as options. Self-monitoring and measuring functions round out the profile. The Siemens 7SR controller is mounted in a cabinet, which also contains the auxiliary power supply and a battery-backed UPS unit, fuses and a general purpose outlet to power a laptop.

Siemens 3AD distribution reclosers offer dependable protection for temporary faults in overhead line networks and improve the reliability of power supply systems. The Siemens 7SR controller, the core of the system, provides a high level of protection, easy operation and high operating efficiency.

  • Ratings through 38 kV

  • Factory engineered, pre-installed and wired accessories for ease of on-site installation

  • Advanced vacuum interruption technology

  • Fully integrated current transformers (CTs) and resistive voltage transformers

  • Dual-coil, low-energy magnetic actuator

You will find detailed information in the recent catalog on the right hand side.

Technical Data

Rated continuos current

400 A; 630 A; 800 A

Rated voltage according to ANSI C37.60

12 kV; 15.5 kV; 27 kV; 38 kV

Short-circuit breaking current

12.5 kA; 16 kA

Lightning impulse withstand voltage

95 kV to 190 kV

Recloser sequence

O–0.2...14400s CO–2...14400s–CO–2...14400s–CO– lock out

Opening time

30 ms

Closing time

60 ms

Number of operating cycles

10.000

Number of short circuit operations

Up to 200; 166 according
to ANSI C37.60 duty cycle

Number of phases

Three-phase, single phase, single-triple

Standards

ANSI C37.60; IEC 62271-111; IEC 60255; IEC-62271-100

Rated voltage (kV)

Interrupting current (kA) (sym)

Lightning impulse withstand voltage (kV)

Operational current (A)

400

630

800

12

12.5

95

15.5

12.5

110

16

110

27

12.5

125

12.5

150

16

150

38

12.5

170 / optional 190

16

170 / optional 190


Dimensions

Rated voltage Ur

15 kV up to 38 kV

Control cubicle weight

66 kg

Switch unit weight

142 - 155 kg

 
Sample
Control cubicle

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

  • Controller based on a protection relay family

  • Completely programmable via menu (not only PC)

  • Integrated ring-core CT for high accuracy SEF protection in compensated networks