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Horizontal V-type center break disconnector DDHV

Center break disconnector with smaller footprint and high reliability

Hitachi Energy’s DDHV – ‘V’ type center break disconnector is a compact, reliable and easy-to operate substation equipment.

Suitable for applications up to 145 kV voltage level, DDHV is designed for installation in outdoor switchyards. It has two moving insulators per phase arranged in a ‘V’ configuration, which makes DDHV design compact and simple.  Due to this, DDHV is a preferred solution for substations where space is costly or limited.

DDHV disconnectors enable flexible design and reliable operations. Built-on earth switches are available and can be mounted on one or both sides of the disconnector.

Applications:

  • Substations in small areas
  • Pole-top mounted
  • Mobile substations
Why Hitachi Energy
  • Reliable design
  • Tested as per latest and relevant standards
  • Maintenance-free contact system
  • Simple and reliable interlocks
  • Easy installation and commissioning
  • Consistent, smooth operation with manual or motor operated mechanism
Brief performance data

Specification

Unit

 

 

Rated voltage

kV

126

145

Rated current

A

<= 2000

<= 2000

Rated peak withstand current for disconnector earth switch

kA(peak)

115

115

Rated short time withstand current (3 s) for disconnector and earth switch

kA (rms)

44

44

Rated power frequency withstand voltage at 50 Hz for 1 min

To earth and between phases

kV (rms)

230

275 (wet) / 335 (dry)

Across isolating distance

kV (rms)

230 (+73)

369

Rated lightning impulse withstand voltage (1.2 / 50 μs)

To earth and between phases

kV

550

650

Across isolating distance

kV

550 (+103)

750

Resistance of circuit

μΩ

120

120

Horizontal V-type center break disconnector DDHV

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