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 |
|
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