Fault recorder FR947 is one of the products of the family of fault recorders
manufactured by
IRUS
Energy Co.
This device is this company's general and initial version of Digital Fault Recorders
(DFR). The
above device is designed for use in the transmission grid and transmission and
sub-distribution
substations to record current, voltage, and digital values under certain conditions of
recording
(trigger condition) for each two analog and digital channels. The user can set the
recording
conditions for analog channels using thresholds (maximum, minimum, or rate) of RMS, RMS
50Hz, THD, zero, positive and negative sequences, active and reactive power, and
frequency. All
setting conditions can be placed in logical OR and or AND circuits.
DFR FR947 uses GPS signals for synchronization. This feature enables time values with
millisecond resolution and microsecond accuracy.
The GPS Receiver device is an internal board
integrated with the system, and only the GPS antenna is installed outside the device.
Other
synchronization sources, such as NTP and IRIG-B, are also available.
By connecting to the device's Ethernet 10/100 BASE-TX or FX port or RS232 serial port
and a
normal personal computer, the user can fully configure, parameterize, remote control,
and
download recorded values. FR947 with an internal memory can manually or automatically
save
errors and incidents in the memory of computers connected to the device.
Each FR947 device is equipped with 32 analog inputs configured in groups of 4 voltage/current according to the buyer's order and at the factory. The default design of this company is 16 current analog inputs and 16 voltage analog inputs.
Each channel provides the possibility of displaying a signal and measuring a wide range of values with a bandwidth of DC ÷ 3.5 (-3 dB). With the precise and complex architecture of the system, the sampling frequency can be adjusted up to 10 kHz.
Each analog input is converted to a digital signal with a 24-bit ADC.
For each current input, it is possible to measure 150 Arms for 1 second without changing the measurement accuracy and 40 amps per second permanently. According to the buyer's order, this company can design cards for current that can measure up to 300 amps.
For each analog voltage channel, it is possible to measure up to 700 V permanently. In this case, the resolution is better than 21 mV, so the best real signal-to-noise ratio of 92 dB can be achieved with these devices.
For each analog voltage channel, it is possible to measure up to 700 V permanently. In this case, the resolution is better than 21 mV, so the best real signal-to-noise ratio of 92 dB can be achieved with these devices.
Resistance sensors guarantee pure voltage signals without any delay, noise, distortion, or phase error.
A very important point is to consider isolation between the channels, the channel to the earth and the channel to the feed. Without taking into account the proper isolation of KVDC 3, it is impossible to record the error without the device hanging or the failure of the input channels, etc.
