New TemPower2 Air Circuit Breakers with Built-in OCR
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ACB - Two Steps Ahead Innovations 2008

2 The ultimate in compactness and operational capability TemPower2 is the world’s first “Double Break” ACB, having two breaking contacts per phase. The unique pole structure means that the short time withstand rating (Icw, 1sec) is equal to the service short-circuit breaking capacity (Ics) for all models. Full selectivity is guaranteed up to the full system fault level. TemPower2 ACBs have the world’s smallest depth resulting in space saving in switchboards. More than twenty design patents have been registered for the TemPower2 ACB. Terasaki’s core business belief is commitment to our...

3 Increased accessibility from the front It enhances ease of installation, operation, and maintenance. No extra arc space required, vertical stacking permitted Replacement of the main contacts¶ The fixed and moving main contacts can easily be replaced in the field, thus prolonging the life on the circuit breaker. Changing each pole takes The TemPower2 ACB dissi- around 15 minutes. pates all arc energy within its unique “DoubleBreak” arc chamber. The internal energy dissipation within the ACB allows the clearance distance of the ACB to nearby earthed metal to be zero. This will assist in...

4 No clamp screws used for the main circuit contact units¶ There are no clamp screws or flexible leads in the main circuit contact units. This substantially enhances the durability of the main circuit contact units and improves the reliability in ON-OFF operation. Isolating main contact Fixed main contact Moving main contact Main circuit contact units Easy Maintenance The unique design of TemPower2 incorporates its isolating clusters and main contacts on the ACB body. Allowing for quick easy maintenance of the main electrical contact points and for maintenance to be completed without having...

5 Enhanced selectivity At Terasaki our protection relays have ‘LSI’ characteristics as standard. This provides an adjustable time delay on overload (L) and also the l2t ramp characteristic (S). As shown, these are essential to provide selectivity when grading with other protective devices such as downstream fuses and upstream relays. The standard ‘LSI’ curve provides more than five million combinations of unique time current characteristics. Zone selective interlocking is available to provide zero time delay selectivity. As the rated breaking capacity is identical to the rated short-time...

6 7 Remote Communications Protocols (optional) Data communications via Modbus, an open network, are supported. Energy Measurement I, V, kW, MWh, kVar, cosø, frequency Intelligent Fault Analysis Status, fault type, fault size, tripping time, fault history Maintenance Information Trip circuit supervision, contact temperature monitoring. For details please refer to page 12. For other protocols please contact terasaki. Two channel pre-trip alarm function (optional) This function can be used to monitor and switch on additional power backup to feed critical circuits. For example, the function can...

8 1 Features Optimum protective coordination Why use a separate panel mounted protection relay when you can have all the benefits of I.D.M.T. protection integral to the ACB? TemPower2 is available with a choice of flexible protection curves to assist in selectivity applications. S.I. Standard Inverse V.I. Very Inverse E.I. Extremely Inverse All these curves are user definable and comply with IEC 60255-3. Standard transformer and generator protection characteristics are also available. AGR-L Industrial & transformer protection AGR-S Generator protection AGR-R Characteristics to IEC 60255-3...

9 Protection relay performance Ensure that the ACB you specify suffers no loss of performance when tripped by an external protection relay! The TemPower2 ACB suffers no loss in performance when tripped through an external protection relay. Some competitor’s ACBs have reduced breaking performance when an external protection relay is used. External Relay 100kA Double opening and closing coils Double Opening and Closing Coils provides extended control system redundancy to an ACB. Double coils allow designers to implement back-up tripping and closing systems. It provides the end user with...

10 1 Features Double Neutrals System harmonics, in the face of increasing triple-N harmonic currents Terasaki have launched a range of ACBs with double neutrals from 800 – 6300Amps – The ‘AR-DN’. Terasaki have the widest range of double rated neutral ACBs on the global market. TemCurve TemCurve Selectivity Analysis Software is shaped around the extensive range of Terasaki circuit breakers, but also includes a large number of complimentary protective devices such as High and Low Voltage Fuses to BS88/IEC269, IDMT Relays to BS142/IEC255. As a result, TemCurve can assist in protection device...

11 • Compact size for high packing density • No extra arc space required for clearance • Low temperature dissipation • Built in trip supervision circuit • Fully rated neutral as standard • Terminal connections and accessories are field changeable • Uniform panel cut out size • Time Current Characteristics to IEC 60255-3 • Standard, Very and Extremely Inverse curves available • Restricted and Unrestricted ground fault protection in one relay • LSI characteristic curves as standard • True r.m.s. protection • Integral reverse power protection and load shedding relay • Self checking protection...

12 1 Features Communication facility added to TemPower2 TemPower2 is equipped with an optional communication interface unit that allows data exchange with a host PC via a Modbus open network. Data communicated includes measurements, fault log, maintenance information, ON/ OFF status, settings, and control (ON/OFF/RESET) signals. Item Modbus Transmission standard RS-485 Transmission method Two-wire half-duplex Topology Multi-drop bus Transmission rate 19.2 kbps max Transmission distance 1.2 km max (at 19.2 kbps) Data format Modbus-RTU or ASCII Max number of nodes 1 – 31 Cause Whichever trip...