Latvia – Public tender: 550 kVA prime trailer-mounted sets
A written technical specification (public tender) for 550 kVA prime trailer-mounted sets: we analysed the requirements and selected TRX SD TA 0660 (SDEC SC27G755D2, 660 kVA standby / 600 kVA prime), answered 14 points in a compliance table and prepared the documents listed below.
- Country
- Latvia
- Application
- Public tender
- Power
- 660 kVA standby / 600 kVA prime · 50 Hz
- Quantity
- Several sets
- Source of requirements
- Written technical specification
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We reply in English.
The request
| Rating | 550 kVA prime |
|---|---|
| Electrical | 400/230 V, 50 Hz, 3-phase, 1500 rpm |
| Site conditions | Max 40 °C, min -30 °C |
| Noise | 75 dB(A) at 7 m |
| Enclosure | Trailer-mounted |
| Fuel tank and autonomy | 800 L tank, 8 h autonomy at 75 % load |
| Engine | Water-cooled, turbocharged; EN 590 fuel; Fuel consumption ≤85 L/h at 75% load; Start at -20 °C without pre-heater |
| Alternator | PMG or AREP excitation; Full damper winding; Class H; IP23; 3-phase sensing AVR ±0.5%; THD <2% no load / ≤4% load |
| Controller and communications | GSM + location + history log; Remote start/stop; USB log; Grid-parallel (GPO); Synchronisation/load sharing up to 3 sets; 5 years free monitoring software |
| Standards | ISO 9001:2015; CE; LVD; EMC; 2005/88/EC; 2006/42/EC; IEC 60034-1; ISO 8528-1 |
| Other requirements | 110% overload 1 h in 12 h; handover load test 0-50-100-110%; Negative phase sequence current ≥10% continuous; Stainless or plastic fuel tank; Cold-climate heaters; 16×20 m 150 mm² cables; Automatic gas fire suppression; Factory noise report (8 points at 7 m) with the bid |
Our work
Requirement analysis · Model selection and sizing
- 550 kVA PRP required → selected 600 kVA prime model
- 110% overload (605 kVA) checked against 660 kVA standby
- 8 h autonomy checked: 1,263 L / ≈87.4 L/h ≈ 14.5 h
Point-by-point compliance table
| Item | Required | Our proposal | Assessment |
|---|---|---|---|
| Prime power | 550 kVA prime | 660 kVA standby / 600 kVA prime | Complies |
| Frequency and speed | 50 Hz | 50 Hz, 1500 rpm | Complies |
| Fuel tank | 800 L | 1,263 L base tank | Complies |
| Fuel ≤85 L/h at 75% load | – | – | Deviation / to be confirmed |
| PMG/AREP alternator, AVR ±0.5% | – | – | With option |
| THD limits | – | To be confirmed on alternator datasheet | Deviation / to be confirmed |
| O4 trailer ≤12 t | – | To be confirmed | Deviation / to be confirmed |
| Tank material stainless/plastic | – | To be confirmed | Deviation / to be confirmed |
| Noise report 8 points at 7 m with bid | – | Factory test to be performed | Deviation / to be confirmed |
| Negative phase sequence current ≥10% | – | Alternator manufacturer declaration to be provided | Deviation / to be confirmed |
| Grid parallel and EN 50549 protection | – | Controller capable; grid requirements to be confirmed | Deviation / to be confirmed |
| -20 °C start without pre-heater | – | Engine manufacturer confirmation required | Deviation / to be confirmed |
| Cold-climate heaters | – | Cold-climate package | With option |
| Trailer registration, cables, handover load test, 72 h replacement set | – | By bidder; Terex Diesel technical support | Buyer / local scope |
Options identified and priced
- PMG + MX321 or AREP + D550 alternator
- Cold-climate package
- Stage V engine version
- O4 trailer
- Spare replacement unit for bidder
Documents prepared · Offer package
- Compliance table
- Compliance table prepared with 131 clauses (96 yes, 8 yes-option, 26 to be confirmed, 1 deviation)
Proposed solution
TRX SD TA 0660
| Standby power | 660 kVA / 528 kW |
|---|---|
| Prime power | 600 kVA / 480 kW |
| Voltage · Frequency · Speed | 230/400 V · 50 Hz · 1,500 rpm |
| Engine | SDEC SC27G755D2 · 26.6 L |
| Alternator | Terex TA355-470N · AVR AS440 · IP23/H |
| Fuel consumption · At 75% load | 95.3 L/h |
| Fuel consumption · At 100% load | 126 L/h |
| Fuel tank (Canopied (soundproof)) | 1,263 L |
| Dimensions (L × W × H) (Canopied (soundproof)) | 4,200 × 1,816 × 2,806 mm · 5,341 kg |
| Dimensions (L × W × H) (Open type) | 3,750 × 1,700 × 2,350 mm · 4,513 kg |
Values are taken from the model’s datasheet; the full datasheet and catalogue page are on the model page.
Offered configuration
- Controller: Deep Sea DSE8610 MKII
- 1263 L integrated tank
- Cold-climate package as option
Packing, shipping and export documents
- Sets are secured on the vehicle or in the container; loose parts travel in crates or on pallets.
- Export documents: commercial invoice, packing list, certificate of origin, A.TR movement certificate for EU customs clearance, factory test report.
Customer, tender and site names are withheld; only the country is shown. Prices and commercial terms are not published. Customer documents are not shared; requirements are summarised in our own words.
How we work with your specification
- Send the specification, datasheet form or list of needs (PDF, Excel, Word or a message).
- We reply on the same working day and ask about missing or unclear points.
- We size the power (prime/standby), voltage, frequency, ambient conditions and autonomy, select the model and prepare a point-by-point compliance table. Deviations and options are stated openly.
- We send the package — offer, datasheet, catalogue pages and any forms requested; for standard configurations within 24 hours.