WESCO | Voltage Sag compensation

FAQ

What is TSP^® Capacity?

Under 3-phase low-voltage standard such as AC 3-phase 208V, 220V, 380V, 440V, TSP^® can produce and provide the capacity of from 5kVA up to 2400kVA. – TSP^®Large Capacity

Under single-phase standard such as AC single-phase 110V, 208V, 220V, TSP^® can produce and provide the capacity of from 0.5kVA up to 20kVA. – TSP^®Small·Medium Capacity (compensation capacity supply other than the standard capacity is subject to customized order specification)

What should I do if I need TSP^® with larger capacity?

It can be supplied upon special request of client. It needs more capacitor of larger scale, and the semiconductor and static switch have to be upgraded.

Do I use multiple number of TSP^®s with small capacity? or Is it better to use oneTSP^® with large capacity?

It depends on the structure of control circuit. When many control transformers connected to one starter or contactor, proper number of TSP^®s with smaller capacity are needed. On the other hand, one control transformer with large capacity supplies various control items under common control bus, one TSP^® with larger capacity has to be used. Also, installation site and management viewpoint for maintenance need to be considered too.

Isn’t it inefficient if I use many TSP^®s with small capacity?

If possible, control circuit needs to be consolidated and the partial reconnection cost for this work needs to be considered. In this way, medium size or large size TSP^® can be installed. However, it can be difficult to consolidate and use one TSP^® because different timer settings are needed for many different loads. The best option is to use several medium-size units which can adjust its setting according to the cognate loads.

What don’t we use USP with a similar capacity for the same purpose?

There are many reasons.

1. When voltage sag occurs, the loads will drop with the Off-Line UPS with smaller capacity because Off-Line UPS cannot switch-over fast enough. Ultra-fast switch-over is needed for many sensitive equipment because they start causing problems in a very short period of time, 1/4 Cycle(4ms). TSP^® can switch over within 1/8 Cycle (2ms).

2. Many other USPs cannot operate under inductive load or low power factor in switchboard.

3. Due to inrush current which is highly related to current Relays, Contactors or Starter, users need to choose oversize UPS to bear this inrush current. For this purpose, Static Switch of TSP^® is overrated about 8-10 times in the aspect of voltage and current, thus the users don’t need to select oversize unit and select the size of the unit by the continuous VA rating.

4. Precise control is possible because the functions such as adjustable timer and variable transfer level are already included in each unit. Thus, no further purchase or installation of additional functions are needed unlike the case of UPS. USP provides the power current for an unlimited time because it doesn’t have timing device, and it is very dangerous in any case.

5. There are battery-related problems. Maintenance, replacement and hazardous waste processing and etc.

6. USP doesn’t satisfy the rigidity requirements of industrial environment. Sometimes cooling or ventilation is required and sometimes the thickness of its enclosure is too thin and not durable. There can be a limitation in applying UPS, due to the environmental constraint of the operation site.

Is the price of TSP^® with smaller capacity higher than the price of UPS with the proper capacity?

Per VA price is lower than UPS because even TSP^®with minimum standard has unique features as stated below.

1. TSP^®uses standby structure, super high-speed transfer time of 2mS, which is highly reliable.

2. TSP^® doesn’t need maintenance because it has no additional cooling fan with Off-Line compensation method.

3. TSP^®is very cost-efficient because it doesn’t need additional maintenance by using low-voltage Ultra-Capacitor with no battery which can last over 10 years.

4. TSP^® includes adjustable Ride-Through Timer and Variable Transfer Level.

5. TSP^® uses Overrated Static Switch which doesn’t need over-sizing according to changing loads.

6. TSP^®’s Housing is more suitable for the harsh industrial environment.

7. Long-term maintenance cost is negligible because TSP^® doesn’t need regular maintenance.

Even though the initial installation cost is somewhat higher, in the long term, TSP^® is more efficient because it doesn’t need a battery and there is no regular repair or further replacement cost.