The Worldwide Leader in Flicker and Arc Furnace Power Monitoring Technology
Flicker/Harmonic Analyzer 2DPC
UHP International, Inc. is the worldwide leader in flicker monitoring equipment, technology and services. Precision systems are installed in North America, Europe, Asia and Africa. Monitoring services and analysis have been provided throughout the world. As a result UHP maintains an extensive database of flicker situations for comparison and projection purposes.
The fully continuous three phase UHP Flicker/Harmonic Analyzer Model IID is the latest generation of precision flicker monitoring equipment utilizing fully digital technology to further enhance functionality, accuracy, analysis and control/warning capabilities. It is three separate and independent flicker and harmonic monitors in one. The system provides not only local, but also complete remote monitoring, display, data analysis and logging through normal telephone networks. Graphic and Summary data analysis and printing is provided from the operating software.
Typical Installation
The UHP Flicker/Harmonic Analyzer Model IID can be operated as a control and warning device independent of a host computer. After setup the system can provide user defined analog outputs for SCADA systems and relay warning for annunciator systems without further PC control. The typical local installation uses the following equipment (Remote PC should be similar):
- UHP Flicker/Harmonic Analyzer Model IID
- Host Windows®(or WinXP) based PC with modem and SVGA (800x600) display
- Open frame relay control board for annunciator system (optional)
- Local printer if required
PC Requirements
The local or remote PC should be a 486/66 or higher with at least 32 Meg ram running Windows® 3.1 or Windows 95®. The modem should be capable of 14.4 Kbs or faster. UHP can provide the local PC in standard lockable 19” rack mount form. The rack mount PC system typically consists of (units are lockable for security):
- 486/66 or Pentium PC Unit 32 Meg Ram, modem and Windows® software
- Keyboard/mouse sliding drawer
- SVGA(800X600) monitor with enclosure
- Rack mount surge suppresser
- Optional UPS system using station batteries
Software
UHP Flicker/Harmonic Analyzer local software and any other necessary software is pre-installed for each system shipped with host PC and is provided on 3.5" disks for local and remote software installation by the customer.
Flicker and Harmonic Computation
Each of the three inputs is measured independently by isolated modules. For each module the line voltage is resistively divided down to A/D levels and then digitized by a 16-bit converter. Two input ranges for voltages up to 240 volts RMS are software selected in supervisory mode. The sampling frequency is sufficient to measure up to the 30th harmonic at 60 Hz with a 100% over-range capability. Internally 30 harmonics, both real and imaginary components, are calculated. The dominant harmonic is selected from this information. The total harmonic distortion is calculated as the square root of the sum of the squares of all the components.
For the flicker measurements, each input data point is squared and passed through a sharp low pass digital filter with a break point at 38 Hz. Any residual line frequency components at 120/100 Hz are removed. Further filtering results in a flicker band pass filter of 0.5 Hz to 38 Hz. Between 1 and 30 Hz this (“FLAT”) filter deviates from 100% response by less than 1% and typically under 0.3%. The output, or processed flicker signal, is then converted to an RMS value. Dominant flicker frequency, line frequency and harmonic frequency are continuously calculated and displayed.
Special Filters
Filters corresponding to UIE and IEEE curves are included in the UHP Flicker/Harmonic Analyzer Model IID. These filters are based on the inverse of the defined filter and 100% response at the center or most critical frequency. Actual limits for the selected filter are set in the supervisory mode. When selected in supervisory mode, the flicker signal from the “FLAT” filter is passed through the selected digital filter to achieve the specific frequency response. Additional, user-specified filters are optionally available and can be selected by software or controlled by digital inputs selection on the rear of the unit.
Specifications
| Inputs Connections | Switch selectable from BNC or Barrier Terminal Strip |
| Input High Voltage Ranges | 50 to 240 in 2 ranges on barrier strip(software selectable) |
| Input Low Voltage Range | 05. to 2 volts RMS at BNC terminals |
| A/D Conversion | 16 Bit |
| Flicker Calculation | RMS |
| Harmonic Calculation | FFT |
| Output Time Constant* | 0.25 Seconds("FAST"), 2.5 Seconds("NORMAL") |
| Display Update Rate* | 0.5-1 Second Depending on host PC processor and Video |
| Communication | RS-232 Serial port 9 Pin male connector |
| Auxiliary Inputs (AUX 1, AUX 2) | 2 Channels Differential and ground referenced |
| Voltage Range | +/- 10 Volts DC can be scaled in software to any value |
| A/D Conversion | 12 Bit |
| Analog Outputs (Optional) | 3 Flicker Level and 3 Harmonic Level one for each phase |
| D/A | 12 Bit 4-20 ma or 0-10 volts DC with 100% overscale |
| Other options are available | |
| Relay Control (Optional) | Open Frame Relay Board |
| Digital Filter Selection (Optional) | Digital Inputs provided for user control of flicker curve selection |
| Power Requirements | 120 Volts AC |
| Case Size | Rack Mount or Portable |
| Weight | 35 Pounds approximately |
Download the Flicker/Harmonic Analyzer PDF