Metal - Clad Switchgear Withdrawable VCB Type (HVZ Series) 12Kv/17.5kV

Toshiba Switchgear

A) Design Concept

HVZ Series is designed & manufactured with the operator’s safety as the top priority while providing:

  • Minimum maintenance
  • Easy installation
  • A simple but flexible design

HVZ Series has passed all the mandatory tests stated in IEC standard. In addition, it has also passed the stringent tests to IEC highest endurance class E2 (list 1),mechanical endurance class M2, and Capacitive Switching Performance class C2 in accordance to the latest IEC 62271-100 (previously known as IEC 60056) and internal arc fault test for the operator’s safety.

HVZ Series also offers high power supply reliability during the maintenance of the circuit breaker with minimum loss of service continuity (Category 2B) & guarantees safety with perfectly earthed metallic partitions.

B) Key Features

  • Personal safety
    • Designed to withstand the effects of an internal arc in accordance to IEC 62271-200 (IAC class). Ensures maximum operator safety.
    • Equipped with mechanical and electrical interlocks across all various configuration in accordance to IEC 62271-200 to enable safe and reliable service.
    • Fully close door operation.
    • Front operation.
  • High Reliability
    • Utilizes Toshiba’s Vacuum Interrupter technology with abundant proven service record.
    • VCB with IEC highest mechanical & electrical endurance class.
    • Utilizes robust & highly reliable interlocking system.
  • Minimum Maintenance
    • Maintenance-free Toshiba Vacuum Interrupter (VI)
  • Fully Extensible Configuration
    • Fully extensible
    • Modular built allowing flexible customisation with shorter lead time.
  • Space Saving
    • Compact size with small footprint.
  • Simple Installation
    • Convenient and user-friendly installation process.
    • Low transport weight.
    • Easy panel line up.
    • Improved erection efficiency.

C) Safety Interlock

  • The Circuit Breaker Truck racked in and racked out only when the VCB is in OPEN condition.
  • The Circuit Breaker can be CLOSED condition only when it is in the “Isolated/Test” or the service position. In between these 2 positions (intermediate position), VCB cannot be CLOSED.
  • The Circuit Breaker Truck can be racked in from the “Isolated/Test” to the “service” position only when the control Secondary Plug is inserted and the Plug’s interlock bracket is located in its correct location.
  • The Circuit breaker can only be racked in from the “Isolated/Test” to the “service” position if and only if the front door is closed.
  • The Circuit Breaker Truck can be racked in from the “Isolated/Test” to the “service” position only when Earth Switch is in the “Open” condition.
  • The Earth Switch cannot be closed when the Circuit Breaker Truck is in the “Service” position.
  • The Earth Switch can only be closed when the Circuit Breaker Truck is in the “Isolated/Test” position.
  • The VCB Compartment door can only be opened when Circuit Breaker Truck is in the “Test” position.
  • The Earth Switch can only be operated when the VCB Compartment door is closed.
  • The Cable Compartment door/cover can only be opened when the Earth Switch is in the “Close” condition. (Optional)
  • The Earth Switch cannot be closed when the cable is live. (Optional)
  • Cylinder key lock/Castell key interlocking system. (Optional)

Technical Data

Typical View

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