Transitioning from low voltage (LV) to medium voltage (MV) level is a natural progression for power protection in large critical power facilities. The approach offers two main advantages. It increases reliability and reduces the costs of installing and operating a critical power facility.
The MV design approach with larger protected load blocks achieves greater reliability thanks to a lower number of switchboards and the operating culture of medium voltage systems.
Installing power protection at the MV level provides the most energy-efficient configuration, as the lower currents at this voltage result in smaller cables and lower losses.
ABB ZISC is a revolutionary high-performance, high-efficiency power conditioning and uninterruptible power supply architecture. It protects against a wide range of grid voltage events and supplies continuous clean power.
The ZISC architecture is based on an isolation line reactor combined with high-performance ABB power converters. This simple approach, supported by advanced control, provides unparalleled reliability and performance with class-leading efficiency.
The power converters, separated from the electrical grid via the isolation line reactor, continuously regulate and filter harmonic and voltage imbalance distribution grid issues without cycling the energy stores. Load-related events such as downstream faults and other dynamic reactive current demands are managed by the high overload capacity of ZISC.
The isolation line reactor and coupling transformer are implemented at medium voltage, whereas the power converters and energy storage are at low voltage, thus facilitating maintenance.
ABB ZISC, combined with a wide range of modern energy stores, offers autonomy from a few seconds to several minutes.
| Product Class |
7.2 kV IEC |
12 kV IEC |
15 kV ANSI |
24 kV IEC |
| Nominal Voltage |
6–6.6 kV |
10 – 11 kV |
12.47 – 13.8 kV |
20 – 22 kV |
| Nominal Apparent Power |
2500 kVA |
2500 kVA |
2500 kVA |
Single unit |
| Nominal Active Power |
2500 kW |
2500 kW |
2500 kW |
2500 kW / Power factor 1.0 |
| Parallel Configuration |
Up to 10 units |
Up to 10 units |
Up to 10 units |
Up to 10 units |
| Performance |
|
| Efficiency |
98% (between 50–100% load) |
| Dynamic output performance |
Compliant with IEC62040-3 Level 1 SS III |
| Architecture |
Line-interactive structure with ZISC |
| Input |
|
| Voltage tolerance |
±10% |
| Frequency |
50 Hz / 60 Hz |
| Power distribution system |
IT, 3-Wire Input |
| Output |
|
| Nominal frequency |
50 Hz or 60 Hz |
| Load power factor range |
0.9 lagging – 0.8 lagging |
| Energy Storage |
|
| Energy storage type |
Lithium-Ion Batteries |
| Energy provider |
ABB recommendation |
| Energy storage duration |
15 seconds – 15 minutes |
| Interface |
|
| System display |
10” touchscreen |
| Advanced functionality via display |
Comprehensive service log |
| Communication |
Ethernet Modbus TCP™ |
Features
- Scalable power from 2.5 MW to 25 MW in parallel; allows for load growth with less wasted capacity and reduces CAPEX.
- Fifteen years of energy savings compared to rotary systems. Leading efficiency in line-interactive UPSs.
- The system can be used for energy reserves, grid support services, or peak shaving.
- Intervals between non-intrusive maintenance. Real-time monitoring with ABB Ability™ for maximum uptime.
- IEC 62040-3 Class 1 load protection, sub-cycle response load conditioning ensures the load is isolated from the grid.
- CO2 emissions reduced by 1,360 tons over the product's lifetime.
TR