Wattmeter D305, D305 three-phase three-wire (D 305, D-305)
For measurement of active and reactive power in three-phase three-wire circuits AC 50 Hz for uniform and non-load phases.
Rated current of 5 to 15 000 A.
Full scale range from 1 kW to 800kW (quarks), from 800 MW to 4MW (MVAr), from 1.2 GW to 12GVt (GVar).
Vibration, resistant to shaking.
Wattmeter D305, D305 varmeter designed to measure three-phase active and reactive power in three-phase three-wire circuits of AC 50 Hz for uniform and non-load phases. Shields are used for picking stations and control panels.
Instruments are used at an ambient temperature of -40 to +50 C and relative humidity up to 95% (at 35 ° C). Use the equipment at a temperature of -50 to +60 ° C and relative humidity up to 95% (at 60 ° C).
In terms of resistance to mechanical impact devices are vibration and tryaskoprochnym.
The basic error of devices on all of the scale at the nominal operating conditions does not exceed ± 1,5% full scale.
Rated power factor wattmeter cos φ = 1, for varmeter sin φ = 1.
Settling time moving part ......... ≤ 4 sec
Operating position vertical unit ..............
The nature of the scale even ....................
Wattmeters D305, D305 varmeter (with zero on the left and middle) are included, directly or through instrument transformers. With the direct inclusion of voltage 127, 220 and 380. When a measuring transformers with secondary windings 100 and 127 to a nominal voltage of 380 to 5 ∙ 10 5 (GOST 1983-67).
Rated current of 5 to 15 000 a.
Scale value from 1 to 800 kW (quarter), from 4 to 800 MW (M Var) from 1.2 to 12 gigawatts (Gvar).
Change in the readings caused deviation of ambient temperature of 20 ± 5 ° C (class H) does not exceed ± 0,8% for every 10 degrees, under the influence of an external magnetic field of strength
400 A / m - less than ± 2,5%; due to the influence of non-uniform loading phase - less than ± 1,5%.
Overall dimensions are shown in the figure, the mass of the device 1.2 kg.
On a design case with a dust-and splash-proof.
According to the principle of the device are ferrodinamicheskim.
The device is applied to a fluid damper fluid POLYMETHYLSILICONE 700 cst.
The devices comply with GOST 8476-60 and TU 25-04-165-67.