HE-VERT
MEDIUM VOLTAGE FREQUENCY DRIVES
Product
Structure
Compact
Cabinet
3.3 kV / 150 – 590 kW
4.16 kV / 180 – 750 kW
6 kV / 315 – 500 kW
10 kV / 400 – 800 kW
Standard
Cabinet
Double-side Service Zone
3.3 kV / 1 .250 – 2 .750 kW
4.16 kV / 1 .600 – 4 .600 kW
6 kV / 630 – 5 .000 kW
6.6 kV / 2 .500 – 5 .500 kW
10 kV / 400 – 10 .000 kW
11 kV / 470 – 11 .000 kW
Standard
Cabinet
Front-side Service Zone Only
3.3 kV / 700 – 1 .100 kW
4.16 kV / 900 – 1 .400 kW
6 kV / 315 – 2 .000 kW
6.6 kV / 365 – 2 .250 kW
10 kV / 400 – 3 .200 kW
11 kV / 470 – 3 .700 kW
Water Cooled
Cabinet
3.3 kV / 3 .000 – 5 .700 kW
4.16 kV / 5 .500 – 7 .200 kW
6 kV / 2 .250 – 12 .500 kW
6.6 kV / 2 .500 – 13 .000 kW
10 kV / 12 .500 – 23 .000 kW
11 kV / 12 .500 – 25 .000 kW
Scheme 1 // External water supply
Specification and requirements
The external water quality and temperature requirements:
| Name | Parameter | Unit | |
|---|---|---|---|
| TDS(total dissolved solids ) | ≤1 .000 | mg / L | |
| PH value | 6.5 – 8.5 | ||
| Hardness (caco3) | ≤450 | mg / L | |
| Chloride | ≤250 | mg / L | |
| Sulfate | ≤250 | mg / L | |
| Suspended Material | ≤30 | mg / L | |
| Water Pressure | 2.50 – 6 | Bar | |
| Solid particles size | ≤200 | μm | |
| Water freezers of external water of water cooling cabinet | t / h | ||
| Water freezers of external water of transformer cabinet | t / h | ||
| inlet temperature of external water | 5 – 32 | °C | |
| outlet temperature of external water | T1+5 | °C | |
Scheme 2 // Cooling tower
Description
Closed Circuit Cooling Tower / Closed Loop Cooling Tower operates during a manner the same as standard cooling towers, except that the smart heat to be rejected is transferred from the method fluid to water and close air directly through a heat exchange coil. The coil serves to isolate the method fluid from outside atmosphere, keeping it clean and contamination free during a control system, so making two separate circuits.Closed Circuit Cooling Tower / Closed Loop Cooling Tower operates during a manner the same as standard cooling towers, except that the smart heat to be rejected is transferred from the method fluid to water and close air directly through a heat exchange coil. The coil serves to isolate the method fluid from outside atmosphere, keeping it clean and contamination free during a control system, so making two separate circuits.
- Primary / Internal circuit in which the process fluid circulates inside the coil
- Secondary / External circuit sprays circulating water from the basin over the coil which evaporates to reject heat to the environment.
Scheme 3 // Cooling chiller
Working principle
The cooling water removes heat from the HE-VERT VFD and returns warm water back to the chiller. The chiller cooling process contains a refrigerant which work on the basic principle of compression and phase-change of the refrigerant from a liquid to a gas and back to a liquid. This refrigeration principle provides two separate liquid systems. While the Chiller take the heat out of the cooling water of the VFD and transfers this heat to the second cooling system within the chiller.
The cooling cycle not only separates the two liquid systems, it also provides two independent temperature level in the VFD cooling cycle (Low temperature) and the Chiller cooling cycle (high temperature).
While the low temperature in the VFD cycle guarantees a perfect cooling performance of the power electronics inside the HE-VERT, the relatively high temperature in the Chiller cooling system enable a better heat exchange through the internal heat exchanger with the ambient air because of the higher temperature difference.