Powertech identified a new avenue within its arena of power distribution product and is proud to introduce a new force in the application of specialized Switchgear technology - the Air Insulated Medium Voltage PT ZZK-12 Switchgear series, now available in two models.
This metal enclosed withdrawable Air Insulated Medium Voltage PT ZZK-12 Switchgear series can be installed in a three-phase AC system with a rated frequency of 50 Hz, and voltage of 12 kV. A key feature of this series is the use of maintenance free VED 4-12 vacuum circuit-breakers, which enable continuous operation without expensive and unnecessary shutdown times. The circuit-breaker is flexible and can be used in immovable mounted cells and as part of an individual draw-out carriage when installed on the chassis. Remote-control racking, tripping and closing ensure user friendliness and safety, while its modular design minimizes space requirements. Clear and easily readable interfaces further add to its practical functionality and ease of use.
Safety first – KEMA approved
Peace of mind comes standard with any Powertech product. For maximum personal and operational safety our PT Switchgear designs have gone through rigorous local and international testing, passing set IEC standards and approved by the world-renowned KEMA institute in Holland – highly regarded for stringent independent testing and witnessing of products in the Electrical Industries, the PT Switchgear series is safe to use at altitudes of up to 2 000 m and can withstand seismic activity of 8 on the Richter Scale, making it safe to use in any condition.
Enhancing productivity with minimum maintenance
The maintenance-free design of the PT Switchgear vacuum circuit breakers enables seamless operation without expensive downtimes, while the logical mechanical interlocking system reduces operating interruptions to a minimum. One of its key features is that this product can be operated continually, ensuring optimal productivity.
Hands-on Technical Support
An experienced, highly trained and committed staff complement led by a seasoned management team is at the heart of Powertech's ability to consistently strive to exceed the expectations of our clients. Our PT Switchgear series is backed by our extensive technical support team and comes with a 12 month warranty. It can be fitted and installed within a highly competitive industrial time frame from date of order.
Technical Key Points
The zinc-aluminium coated steel sheets are formed and folded to create the enclosure. This ensures high machining and assembling accuracy, while the zinc-aluminium coated sheets guard against oxidation and corrosion.
The PT Switchgear can be equipped with a motorized racking device for remote control of the circuit-breaker and for a remote trip and close. Functions such as establishment of the isolating distance, as well as feeder and busbar earthing, can be completely controlled from the remote.
The PT Switchgear has such functions as temperature and humidity automatic convection, heat dissipation and internal fault explosion protection. To avoid condensation a 40 W heater should be installed. Relative humidity in a 24 hr average is less than 95%, with a month average less than 90%. Ambient temperature is -450?C +40?C.
Enclosure & Partition
The top three high-voltage compartments are all equipped with a pressure relief plate. A confinement of an internal arc to the respective compartments ensures maximum operational reliability and personal protection.
If an internal fault occurs (since the cubicle door has been reliably sealed), the high-pressure air will be released through the pressure relief plate. The adjacent switchgears are separated by the respective side plate and after the joint there is still an air buffer layer which can prevent the switchgear from penetration and melting caused by the fault arc. The low-voltage compartment is also separated from high-voltage compartments, while the circuit-breaker compartment and cable compartment are separated by the partition. In this way the operator is prevented from accessing the live parts in the busbar compartment and cable compartment, even if the circuit-breaker truck has been removed, in which case the shutter will close automatically.
Switchgear Compartments
The circuit-breaker trolley can be moved between service position and test/disconnected position through the guideway in the circuit-breaker compartment. When the trolley is moved from the service position to the test/disconnected position, the shutter will automatically cover the fixed contacts and the shutter will open with reverse movement. The trolley can be operated with the switchgear door closed. The position of the trolley, the ON (CB closed) / OFF (CB open) button, the closing/opening status indicator and charged/discharged status indicator can be seen through the observation window on the door.
Mechanical Interlocks
The trolley can only be moved from the test/disconnected position into the service position with the earthing switch and circuit-breaker open. When the earthing switch is closed, the trolley cannot be moved from the test/disconnected position into the service position.
The earthing switch can only be operated when the trolley is in the test/disconnected position or the removed position.
The Aurora Borealis, the famed northern lights, is a source of powerful inspiration, named after the Roman goddess of dawn, Aurora, and the Greek name for the north wind, Boreas. A natural phenomenon of stunning beauty which perfectly showcases the power of uncontrolled energy, nowhere else on the planet can such an incandescent display of untamed power be witnessed. It is this inspiration of nature which triggered Powertech's search for the perfect appliance to control the everyday usage of smart industrial energy.
