Tone-frequency signal injection transformers, 20–70 MVA
Transformers for injecting tone-frequency signals of 175 / 188 Hz into 15 or 20 kV MV networks, throughput rating 20–70 MVA. Installed at HV/MV substations, they carry remote-control signals into the distribution network.
- Throughput rating
- oil-filled 20 or 40 MVA; dry-type single-phase 40 or 70 MVA
- MV network voltage
- 15 or 20 kV
- Injection frequency
- 175 / 188 Hz
- Short-circuit current
- 12.5 kA (up to 22 kA for 70 MVA)
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
The oil-filled version is intended for outdoor installation and is available in 20 or 40 MVA. Dry-type single-phase transformers are installed in a building as a bank of 3 units and are rated 40 or 70 MVA. Insulation of the dry-type units is class H, based on aramid fibres. Short-circuit current is 12.5 kA, up to 22 kA for the 70 MVA version.
Technical specifications
| Throughput rating | oil-filled 20 or 40 MVA; dry-type single-phase 40 or 70 MVA |
|---|---|
| MV network voltage | 15 or 20 kV |
| Injection frequency | 175 / 188 Hz |
| Short-circuit current | 12.5 kA (up to 22 kA for 70 MVA) |
| Insulation (dry-type) | class H, aramid fibres |
Replacement for
no direct analog
selected by purpose and main parameters, please confirm with our manager
Request a price and lead time
Tone-frequency signal injection transformers, 20–70 MVA. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Customs codes
| UKTZED (Ukraine) | 8504 23 00 00 |
|---|---|
| HS, 6 digits | 8504 23 |
| CN (EU) | 8504 23 00 |
| HTSUS (USA) | 8504 23 00 41 8504 23 00 45 |
| China customs tariff | 8504 23 11 00 |
Codes are for reference: the final code is determined at declaration for the specific model.
Questions and answers
What signal frequency are the transformers designed for?
Injection frequency is 175 / 188 Hz, MV network voltage 15 or 20 kV.
How do the oil-filled and dry-type versions differ?
Oil-filled transformers of 20 or 40 MVA are installed outdoors. Dry-type single-phase units of 40 or 70 MVA are assembled as a bank of 3 for installation in a building, with class H insulation.
What short-circuit current do the transformers withstand?
Short-circuit current is 12.5 kA, up to 22 kA for the 70 MVA version.
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