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Interface Technology Archives - Parshvi Technology (I) Pvt. Ltd.

Avoiding Risks of High-Voltage Motors

First temperature transmitter for motors up to 11 kV

A large German company in the process industry that equips its plants with the best available technology has become aware of a previously little-noticed risk:

Insulation defects of slot temperature sensors in high-voltage motors after years of use can present serious hazards to downstream systems and to the persons working on them. Knick has taken on the problem and closed this vulnerability with a temperature transmitter suitable for use in high-voltage motors up to 6.6 kV or 11 kV due to its extremely high isolation.

High-Voltage Motors in Continuous Operation
High-voltage motors as used in the process industry for fan, pump and compressor applications often carry out their service for years and decades without complaint. The motors are thermally monitored according to EN 60034‑1. The temperature sensors used for this purpose – so-called slot thermometers – are insulated in the stator slots together with the windings of each motor phase and are used to detect increased temperatures due to insufficient cooling or overload.  Their proper isolation is confirmed by a high-voltage test.

But the isolation is subject to influences in the course of many years of motor operation, which can lead to wear and at worst, to failure. Also carefully implemented isolation can be heavily burdened by transient overvoltages from the power supply, voltage spikes from converters, overvoltages by reflection, continuous mechanical and thermal loads and other effects. If the isolation breaks down, there is a risk of the temperature sensors becoming stressed by the high potential in a phase. The downstream systems and persons working on these systems are at risk.

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Cost Effective and Reliable Monitoring of Photovoltaic Plants using Specialized Isolation Amplifiers

In many cases, the investments intended to increase the efficiency of solar energy plants require a disproportionately high financial expenditure. On the other hand, centrally installed current and voltage metrology in the inverters based on isolation amplifiers can kill two birds with one stone: It increases the efficiency while saving money because it makes decentralized measurements superfluous.

Now that the phase of pure research and prestige objects in solar plants has come to an end and government support has been cut back, the highest priority in the competition of suppliers and systems is optimal cost-effectiveness. The main focus here is placed on the highest possible energy yield to ensure efficient plant operation.

But at the same time one needs to keep an eye on the expenditures required for continuously improving the plant efficiency. Increasing the efficiency by the last tenth of a percentage point doesn’t help if the costs increase disproportionately and the amortization time extends by months or even years. An increase in the efficiency with little or even no expenditure  would be ideal – a real challenge.

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Improving the Safety and Availability of Traction Power Supply Systems

Special components for the DC feeding systems ensure faultless emergency shutdown to avoid severe damages to the system and possible injury of people. Preventing unnecessary disruptions to operation with accurate fault detection has a considerable impact on rail traffic and availability of the system.

Worldwide, there are more than 7 billion dollars a year invested in permanently installed electrical equipment of railway networks. A considerable investment of this money will be spent on public transportation systems, where above average growth is expected over the coming years[1]. One reason for this is the increasing traffic congestion in metropolitan areas.
Another reason is the wish to achieve political aims concerning climate protection and conservation of natural resources.
Both are good reasons to promote the investments in public transportation systems.

Railway lines are installed or extended and existing networks are re-equipped with state-of-the-art technology. Uninterrupted and safe operation is of high priority for the operator of a public transportation system.
Therefore, high demands are placed on the technical equipment.

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On-Site: Controlled Revolutions

Knick isolation amplifiers provide flexible solutions for measurement of wind turbines


In the past few years the development of wind energy production has been characterized by increasingly larger plants up to multi-megawatt size as well as by entering more complex terrains and using offshore sites.

Nowadays, the use of wind energy for electricity generation is not only motivated by environmental concern, it is also a business. Large-scale wind farms with increasingly powerful turbines entail higher investment costs. With the growing capital requirements, also the demands on availability and productivity of the wind turbines (WT) are increasing.

The German WINDTEST Kaiser-Wilhelm-Koog GmbH has specialized on the inspection and assessment of wind energy projects. Their main tasks include the analysis of energetic, technical, and economical aspects related to a wind power plant….

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High Voltage Transducer for Voltage and Current Measurement in Railway Applications

ProLine P 50000

New voltage and current sensors for rail vehicles make it easier to measure electrical parameters by means of calibrated range selection and by equipping them with an integrated universal power supply unit.

The transducers meet all railway-specific standards and impress customers with their focus on safety and their particularly robust design.

Nowadays, in a large number of cases, power electronics are used in electric or diesel-electric locomotives and multiple units (EMU/DEMU), e.g., in the drive systems for traction motors or in the recuperation of braking energy into the power supply network. The control and monitoring of these processes requires the measurement of high electrical voltages and currents at various locations. Furthermore, the corresponding voltage and current sensors are also used to identify error situations (with emergency shutdown), performance and energy measurement, or to monitor auxiliary converters and accumulator batteries.

Based on decades of experience in the field of industrial measurement technology and railway power supply, Knick developed the completely new high voltage transducer series ProLine P 50000 that is characterized by its special design for voltage and current measurement in main and auxiliary circuits of rolling stock. This targeted focus on rolling stock accurately meets the functional requirements for deployment in the following applications.

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