KMB NOVAR-1 Series, Руководство по эксплуатации

Страница: 5 / 77

Novar 1xxx KMB systems
5
1. Description
1.1 Manual Structure
The manual has three principal divisions. The first one describes Novar1106, Novar1114, Novar1206,
and Novar1214 power factor controllers, including “/S400”-version, and simple Novar1005,
Novar1007, Novar1005D and Novar1007D models.
Novar1312 and N ovar1312-3 power factor controllers, designed for rapid power factor compensation,
uses the concepts of Novar1214 and most their features and operations are identical. That is why their
description is in a separate chapter at the end of this manual, and it is only about this controller’s
specific features.
Similarly, it is with a three-phase Novar-1414 power factor controller. His description is therefore also
included in a separate chapter and shows only its specific characteristics.
1.2 Novar1106/1114/1206/1214 Basic Functions
Novar1xxx reactive power controllers are fully automatic instruments that allow optimum control of
reactive power compensation. They take their design concepts from the Novar 1xx/2xx line of
instruments, bringing up a number of improvements and new features while keeping the way of
operation.
The instruments feature precise voltage and current measurement circuits, and the digital processing
of values measured provides high evaluation accuracy of both true root–mean–square values of
voltage, current and power factor values. The inbuilt temperature sensor measures the temperature
inside the distribution board cabinet.
The instruments calculate fundamental harmonic component of active and reactive current with FFT
algorithm. Voltage fundamental harmonic component is calculated in an analogous manner thus
providing accurate measurement and control even in conditions of distortion by higher harmonic
components.
The voltage measurement circuit in Novar1106/1114 is internally connected to power supply terminals;
it is isolated in Novar1206/1214 allowing connection of voltage in the range from 45 to 760 V AC. The
power system frequency can vary in the range from 43 to 67 Hz. The current measurement input is a
general–purpose one for nominal value of a 1 A or 5 A metering current transformer’s secondary side.
The measurement inputs can be connected to the controller in any combination, that is any phase or
line voltage and any phase’s current.
The instrument’s installation is fully automatic. The controller automatically detects both the
connection configuration and the value of each compensation section connected. Entering these
parameters manually is also possible.
Control is provided in all four quadrants and its speed depends on both control deviation value and its
polarization (overcompensation / undercompensation). Connecting and disconnecting power factor
capacitors is carried out in such a way that achieving the optimum compensation condition is by a
single control intervention at minimum number of sections connected. At the same time, the
instrument chooses relay sections with regard to their even load and preferably connects those that
have been disconnected for the longest time and the remanent charge of which is thus minimum.
Within the control process the instrument continually checks the relay compensation sections. If
a section’s outage or change in value is detected, the section is temporarily disabled from control
under relevant setting. The section temporarily disabled is periodically tested and enabled for control
again when possible.
In measurement, harmonic component levels of both voltage and current are evaluated up to the 19 th
order. The current ’s Total Harmonic Distortion, THD, and the Capacitor Harmonic Load, CHL that can