No problem. We are also available after business hours via our emergency cell phone. Contact us for any emergency service.
T +49 5066 90333-0
New Factory in SarstedtIn addition to the existing plant, a new state-of-the-art manufacturing facility is under construction at the HELMKE site in Sarstedt (near Hannover, Germany).
Drive systems - engineered by HELMKEHELMKE is a worldwide acknowledged competence for the delivery of complete drive systems. The converter cabinets engineered by HELMKE are projected and manufactured for customized and branch-specific applications.
We are at your service to carry out diagnostic procedures on your drives both in our workshops and on site.
Diagnostic procedures in our testing station: Any measurings and tests specified according to IEC EN-DIN and VDE regulations or according to customer specifications are available.
The following tests will be executed in order to evaluate the condition of
With the available measurement equipment, these values can be documented
When manufacturing high-voltage and low-voltage windings, partly for converter applications as well as for traction motors, extended winding tests are becoming increasingly important in addition to the established quality inspections (e.g. determination of the insulation value, PI measurement and determination of the tangent-delta). The tests are necessary for all subsequent evaluations and preventive repair works. In particular, shock pulse and partial discharge measurements have emerged as important parameters over the past years.
In order to determine impulse voltage resistance, coil sections as well as entire stators are thoroughly tested at the HELMKE test facilities. The tests are feasible up to 40 kV using digital shock pulse test sources according to EN 60034 15 or IEE 522. These devices trigger a voltage rise within a very short time span (0.1 – 0.2 μs) which provides information on electric strength and insulation of the winding. Special analyzing and diagnostic equipment allow for the test to be carried out even on DC armatures via the so-called segment method.
Partial discharge measurings are carried out more and more frequently on running electric motors and generators worldwide. They help to identify insulation problems in an early stage and allow for more efficient planning of revision works. Partial discharges are a symptom of an ageing winding insulation which leads to small electrical sparks in the hollow spaces of the insulation. If the insulation system has faulty spots, the risk of a failure of the winding increases. Regular measurements of partial discharge activities provide relevant information in order to avoid a failure.
Partial discharges may not only occur in high voltage machines but, because of the pulse load, also in inverter-fed low voltage machines. A new partial discharge measuring system for motor-integrated inverters allows the measurement during active operation or during a winding test with impulse voltage.