Quality of the Power delivered to an electrical consumer is important because it has significant impact on
Energy consumption/ cost
System performance & efficiency
Equipment life time
Aging and performance of the equipment in a facility are influenced by many factors :
Power disturbances, caused by external factors (lightning strikes, faulty power lines, etc.)or internal factors (faulty equipment, electric discharge etc.), degrade the equipment over time, to eventual complete failure.
High-magnitude harmonic voltages are especially detrimental causing:
Malfunction of control devices, signaling systems, protective relays,
Extra losses in capacitors, transformers, and rotating machines,
Increased noise emitted by motors,
Voltage amplification even at a remote point from the distorting load.
Overloaded circuits heat up the wires and cables, decreasing efficiency and performance, and leading to damaged conductors, defective equimpent, and even fire
Excessive reactive loads drop eficiency and raise power bills
Unbalanced loads damage motors and equipment, decrease their efficiency and effective life span
Watching the power quality in real time can protect assets, improve performance, and decrease energy cost.
Factories and facilities have been working for years without a power quality sensor.
So, what would a supervisory device do in the first place?
How would such an investment justify?
In fact, NTPM is not a necessity if :
Unplanned down-times and their consequences are considered inevitable
Unexpected equipment failure and the expensive repair costs are negligible
The effective life of the motors, transformers, computers, and electronic devices is not an issue
Upgrade or modification/ renovation plans (adding, replacing, or moving equipment) are not based on the latest capacity and status of the system
Fire hazard is acceptable !!
NTPM, helps to improve the safety of power systems, and the performance of production lines and utility apparatus. That is possible simply because:
Electrical equipment like Pumps, compressors, cranes, blowers, mills, crashers, grinders, extruders, conveyers, lathes, rectifiers, computers, UPS systems, etc. display a normal electrical pattern indicating they are in a good condition. When something is starting to go wrong, it is first reflected on the pattern. so by keeping an eye on the electrical behavior of the equipment, it is possible to detect and fix impending problems ahead of time, i.e. before they turn into serious expensive and hazardous defects.
What can go wrong?
Overloads due to ware or improper wiring
Winding impedance increase
Conductors heated above their rating
Incoming disturbances such as lightning, grid induced harmonics, etc.
When it comes to modifications like system expansion, upgrade, adding or changing apparatus, and so forth, it is important to make sure that it is directed in a safe and secure manner. That in turn requires first to get a precise picture of the existing system so that the effect of modifications on the system can be foreseen and accounted for. To get a picture of the existing system, a comprehensive load study is required. A comprehensive an precise load study report ideally includes the actual load profiles on all the important portions of a facility during the hours of day (and night), days of month, and months of year. Such a comnprehensive report enables the engineers and managers to make optimum decisions.
NTPM meter/ recorders are, in a standard configuration, equipped with either Ethernet interface. This enables extremely easy integration in existing network infrastructure. In addition, a built in Web support provides an easy way to interact with a device from any web en
abled front end, including tablets and mobile phones.Any HTML5 based web browser is the only external software needed to configure and operate NTPM.
The built in web interface allows instant access to real-time as well as historical measurements, which are displayed in an attractive, dashboard like, user interface.It is possible to easily configure graphs to compare and display only desired information.
Two N.O. (Normally Open) contacts on NTPM may be controlled either directly over the Ethernet link, or by a Rule Enginegeneratedprogram. The output contacts can be used to Open/Close a circuit, Start/Stop an audible alarms or a flash light, etc.
Thanks to the built in rule engine, NTPM energy meters can actively support energy saving actions.NTPM meter/ recorders are equipped with a flexible yet simple rule engine for efficient automation of energy management tasks.
With the Rule Engine, NTPM can be programmed to perform automatic actions in the incidence of certain conditions, like overload, voltage drop, frequency change, termperature rise, harmonics threshold crossover, or even some specified date and/or time.
All the operations may be defined to be executed with some time delay using the embedded soft-timers
Rules are defined as simple IF-THEN statements, where measured and calculated parameters are combined to create a set of conditions.
The programmed sequence may be used to close or open an output contact, or to set or reset a soft alarm, which in turn may be used in the next action.
It is possible for example to create a rule that sets an alarm whenever the current energy demand goes above a certain level in the given time period, thus avoiding to cross the preset maximum demand level (and eventual penalties).