NEW SURGE SUPPRESSORS FOR EXTRA PROTECTION

Zorc surge suppressor rangesurge suppressor

ZORC™ produce a range of unique high-frequency transient overvoltage surge suppressors for the protection of motors, transformers, generators and filter banks from steep wave-front, short rise-time, high magnitude, spikes, surges and other transient voltages, generated by switching and certain other sources.

The protective characteristics of ZORC™ provide comprehensive insulation coordination with both the CiGRé and IEEE motor impulse voltage withstand characteristics at all practical surge magnitudes and rise times.

Overvoltages are not only related to atmospheric impulses, in reality faults and damage can often be caused by other overvoltages such as switching overvoltage, transient recovery voltages and iron-resonance overvoltages. Good reasons to consider the installation of the ZORC™ surge suppressor.

Key Features:

  • Saves money by eliminating production downtime due to insulation failure.
  • Protects motors, generators and transformers throughout their service life.
  • Eliminates multiple pre and re-strike transients associated when switching on or off with vacuum and other switchgear types.
  • Standard and intrinsically safe models available.
  • Three and single phase

Product Functions:

  • System Voltage: 3 phase 400V to 13.8kV with single phase at 15kV
  • Transient protection: 0.1 to 0.2 micro seconds range
  • Special compact versions that can be fitted within most motor/transformer terminal enclosures or switchgear panels
  • RC single phase units available from 24-40KV

Applications for motors include:

  • Fans
  • Compressors
  • Conveyors
  • Generators
  • Crushers
  • Motor-generator sets
  • Pumps
  • Mills
  • Mine winders
  • Mini and mobile substations
  • Power station auxiliaries

Other Applications include:

  • Induction and arc furnaces
  • Mini and mobile substations
  • Dry type transformers
  • Refrigeration machines

To find out more about these new surge suppressors and how they can help you secure your electrical installations from damaging overvoltages, download our new data sheet  or contact Cressall today.

POWER RESISTOR ENCLOSURES:
SEEKING THE ANSWERS

Cressall, has released an informative infographic explaining the essential questions to ask when designing an enclosure.

The guide aims to support design engineers as well as resistor end users across all industries to understand the requirements of their power resistor enclosure.

The infographic is now available to download here.

Power resistor enclosures provide a number of functions, including protection from harsh weather conditions, cooling and preserving the safety of the public. Each of these specifications will vary, dependant on the exact requirements of the client, and the resistor they purchase, however a full understanding is crucial to the design phase.

The research stage is usually undertaken when thecustomer provides an initial specification, but on some occasions, this does not happen, therefore it is the manufacturers responsibility to ask those important questions.

The infographic explains five questions that must be answered in order to design and manufacture an effective enclosure that meets all the required specifications. These queries cover the final resistor environment, industry challenges, aesthetic considerations, health and safety and choices around shipping and installation. By thinking about these points early, the final product can be designed to meet each and every requirement.

“We produced this infographic to provide design engineers, as well as the end user, a checklist of things to consider when they are planning their resistor and corresponding enclosure,” said Andrew Keith, engineering director at Cressall Resistors.

“Sometimes enclosures can be left as an afterthought, but this will rarely achieve the most efficient, advantageous solution. Thinking about the enclosure at the same time as designing the resistor is crucial to ensuring the final product will meet all the requirements, reducing the risk of compromises having to be made.”

Cressall works with clients worldwide to design and manufacture a range of resistors alongside enclosures, including dynamic braking resistors (DBRs), neutral earthing resistors (NERs) and harmonic filters. The full range includes specialised resistors for a number of sectors including rail traction, renewables, marine and offshore.

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CONSUMER RELUCTANCE AND ELECTRIC VEHICLE UPTAKE

Cressall has produced an infographic that explains the reasons why consumers are sceptical about electric vehicles, and how the industry should respond to this reluctance. By supporting design engineers to increase their understanding of consumer concerns, Cressall hopes the industry will be able to overcome many of the challenges it faces.

electric vehicle concerns

The infographic is available to download now.

Electric vehicle manufacturers are faced with a range of challenges, including the requirement for more advanced battery technologies. In addition to technical demands, consumer uncertainty is also hindering sales.

The concerns cited by consumers include a short driving range, limited heating and air conditioning and a lack of charging points. Each of these can be improved or overcome by careful design engineering.

For example, driving range can be increased by using regenerative braking to recapture energy that would ordinarily be lost through friction braking.

“By having an acute awareness of the concerns that are making consumers reluctant to buy an electric vehicle, design engineers can ensure their vehicles are more marketable and saleable,” explained Simone Bruckner, Managing Director at Cressall.

“Increasing electric vehicle sales will not only be profitable for manufacturers but will also have beneficial effects on the environment. According to The Guardian, a hybrid vehicle that uses regenerative braking produces 42g less CO2 per km than the equivalent petrol vehicle.

“In addition, electric vehicles are much more efficient and with government incentives such as bursaries, they can be a more cost-effective option for many consumers.”

Cressall’s EV2 advanced modular water-cooled resistor is specifically designed for hybrid and all-electric vehicles. It’s an essential component in the regenerative braking process, discharging any excess energy in case of the battery being full, an electrical fault or an emergency situation.

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AUTOMOTIVE INNOVATIONS WITH EVT WATER-COOLED RESISTORS

Cressall Resistors has announced the launch of the EVT, a new advanced water-cooled modular resistor. Building upon the success of the EV2, which is used for low and medium voltage applications, the EVT has been developed specifically for rheostatic braking for smaller vehicles.

EVT resistor
The new Cressall EVT resistor designed for the latest hybrid and electric cars.

With the same outline dimensions as the EV2, the EVT has a substantially lower power rating of 10 kilowatts (kW). The new unit has a reduced pressure drop, allowing it to better tackle the automotive market. While the EV2 was designed to fit larger vehicles such as trucks and buses, as well as in marine applications, the EVT is intended to fit into more cars.

In hybrid and pure electric vehicles, energy is usually discharged during braking on batteries. This is not always effective as batteries could be full and, moreover, it may not be viable in instances where drivers need to emergency brake. A resistor is the most size and cost-effective brake that can be added into a vehicle, and will ensure that any dissipated energy is safely and efficiently redirected.

Cooling in the EVT is achieved by pumping cold water into one end of the system. The water then absorbs the heat which is pumped out through a radiator.

“Electric braking via an EVT system provides a number of benefits over mechanical braking, including increased control, higher reliability, mechanical simplicity and weight saving,” explains Simone Bruckner, managing director of Cressall Resistors. “Additionally, any excess energy can be used to support the vehicle’s cabin heating, helping to increase overall energy efficiency.

“Air cooling is not efficient in automotive applications. With electric and hybrid car sales reaching a record high in September 2018, this trend is set to continue, meaning a more efficient way to dissipate low amounts of energy is important.”

According to regulations, vehicles must have three independent braking systems for safety reasons. In a conventional car, these are dual-circuit hydraulic brakes plus a handbrake. For electric vehicles, if braking systems aren’t regenerative, the supposedly green vehicles will waste a lot of energy.

EVT vehicle resistor

The introduction of the EVT means that a wider range of vehicles will benefit from the energy-saving properties of the original EV2. As the number of electric cars on the roads continues to rise, using a water-cooled modular resistor can help vehicles remain as green as their intentions.

For more information on how resistor technology can help advance hybrid and electric vehicle systems, get in touch with Cressall Resistors on 01162 733 633.

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