Two technical parameter 2.1 Rated parameters 2.1.1Rated DC voltage： 220V or 110V (order indicated) 2.1.2 Rated AC data： a) Phase voltage V 3.9 inverse time negative sequence overcurrent protectionPower system occur asymmetric short-circuit and three-phase load imbalance may be the negative sequence current flowing in the stator winding of the generator, and produce harmonic current in the rotor, rotor surface overheating caused, generator's inverse time negative sequence over the protection of rotor flow under the situation not long overheated rotor insulation degradation caused damage to the generator, discrimination protection of generator stator negative sequence current size, consists of three parts: 1) under the time limit: when the negative sequence current is greater than the lower bound value but does not meet the start value of the anti time limit, the alarm ** is delayed by the lower limit; 2) inverse time: when the negative sequence current is larger than the inverse time start value, according to the inverse time lag action equation I22-K t is equal to or larger than a action, type: I2-- generator negative sequence current standard? Value, K - generator operation value of negative sequence current in the standard, a generator rotor surface bear negative sequence current capability of constant; 3) the upper bound limit: when the negative sequence current is greater than the upper bound limit, the upper limit is delayed by the time delay. It is proposed that the turning point in the component current Ir0 is set to 1 times the rated current of the high voltage side to ensure that the turn to turn short circuit in the braking current is less than the rated current Ie Ir, there is no braking effect. Differential current threshold criterion should not be too small, it is recommended to take Icd = (0.3 ~ 0.5) Ie. The setting of the ratio braking coefficient can be carried out according to the following formula: Kcd = Kk (Ktx / Fwc + Fph) Among them, Kk is the reliable coefficient, take 1.3 ~ 1.5 Ktx for the same type coefficient, take 1 Fwc for the current transformer to allow the error, take 0.1 The Fph for the current caused by current transformer unbalanced relative error is 0.05. Ratio braking coefficient Kcd recommended range of 0.3 to 0.7.Id ＝∣ 2.5 mechanical properties 2.5.1 vibration The device can withstand the vibration endurance test of the I level of 16.3 in the GB7261. 2.5.2 impact The device can withstand the impact endurance test of the I level of 17.5 in the GB7261. 2.5.3 collision The device can withstand the impact endurance test of the GB7261 level of I in the eighteenth chapter. 2.6 environmental conditions A) ambient temperature: Work: -40 C ~ 85. Storage: 25 degrees to +70 degrees Celsius, in the limit value does not apply the amount of incentive, the device does not appear irreversible change After the temperature is restored, the device should be able to work properly. Relative humidity: the maximum monthly average relative humidity of 90%, while the average monthly average of. The lowest temperature is 25 DEG C and no condensation surface. When the maximum temperature of +40 degrees Celsius, the average maximum relative humidity Degree no more than 50%. (c) atmospheric pressure: 86 to 106kPa (relative altitude below 2km)
