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DGT 801D Digital generator Transformer Protection Relay AC power supply 5A, 100V, 50Hz
1) Mechanical and working environmental parameters
Dimensions of the cubicle structure:
Ambient temperature: -10ºC ~ +55ºC
Relative humidity: 5%~95%
Atmospheric pressure: 70Kpa~106Kpa
2) Rated electric parameters
Supplementary AC power supply of the printer:
Voltage: 220V, permissive variation: -15% ~ +10%
Frequency: 50Hz or 60Hz
DC power supply: 220V, 110V, permissive variation: –20% ~ +15%
AC current: 5A, 1A; frequency: 50Hz or 60Hz
AC voltage: 100V, 3 100 V; frequency: 50Hz or 60Hz
3) Power consumption
AC current circuit: <0.5VA/phase
AC voltage circuit: <0.25VA/phase (as U=Un)
DC power supply circuit: <50W (normal); <80W (protection operation)
4) Over loading capability
AC current circuit : 2 In—The long-time operation is permitted.
30 In—10s operation is permitted.
50 In—1s operation is permitted.
AC voltage circuit : 1.5Un—continuous operation.
DC power supply circuit (80%~115%) Un—continuous operation.
5) Insulation capability
Insulation resistance: Under the standard test conditions, the insulation resistance between
every circuit and the shell of the protection or between such circuits without electrical
connection is not lower than 100MΩ .
Media strength: Between every circuit and the shell of the protectation or between such circuits
without electrical connection, the 50Hz, 2kV(RMS) and 1 min. test can be tolerated without
insulation break downs and flashovers.
Impulse voltage: Under the standard test atmospheric conditions, the DC power supply input
circuit, AC input circuit, output contact circuit to the ground of the protection and between all the
circuits can tolerate the short-duration impulse voltage test of 1.2/50us standard lighting waves.
The open voltage is 5kV and no insulation damages will occur.
The DGT 801A, DGT 801B, DGT 801C, DGT 801D, DGT 801E, and DGT 801F Protections are the
DGT 801 series products. They are based on a common hardware and software platform except the
number of the hardware sources and the sizes of their respective display panels on the cabinets. The
details can be found in Table 1.1. They all adopt the design of duplicate power supplies and
dual-CPU systems with parallel processing technique. So they are advanced in configuration,
excellent in performance, humanized in debugging and maintenance, reliable and safe in operation.
The DGT801 series protections adopt a common software platform and each contain all the
protection functions necessary for the 600MW ~ 1000MW generator-transformer units. In a project
configuration, the required protection modules can be flexibly provided through the graphic-defined
software for several relays to pe rform their respective different functions. The several layers would
be combined to implement all functions for the generator-transformer units of the various capacities.