Power system frequency change on users, power plants and electricity equipment will produce adverse effect, so must be kept in the rating of 50 hz frequency fluctuation, and the migration does not exceed a certain range.
Power system frequency changes, the impact on the users by the following aspects: 1, the user USES the motor speed is related to the system frequency, frequency change will cause the change of the motor speed, thus affecting the quality of the products.
Through to the main line breaker, plus the rated power load.
Check the frequency meter, to guarantee the full load speed regulating speed at 50 hz is correct.
Check steps: a, indicating if the frequency meter is less than 50 hz, the droop value is bigger than hope.
B, counterclockwise rotation droop potentiometer slowly, until reach 5 ohz.
Disconnect circuit breaker, and adjust the idling speed again, until it is correct.
Close the main circuit breaker, with load, should be at 50 hz frequency meter.
If the frequency meter is not 50 hz, repeat the above method to adjust.
2, the system frequency instability will affect the normal work of the electronic equipment.
3 the main plant, power plants with mechanical equipment, such as fan and collapse in lower frequency, can supply air volume and water will quickly reduce, influence the normal operation of the boiler.
When the diesel engine rotating speed is too high, T -
Speed sensor input to the terminal 10 P detected pulse frequency is too high, T -
P make warning alarm terminal 8 and 17 a low level, turn on the alarm circuit, the fault warning lamp HL1 and fault alarm lights HL2, electric horn HA ring, T -
P at the same time in the process of downtime, shut off the diesel engine.
And the fault memory, multi-function alarm shown on the table & other;
With the words.
Overspeed protection threshold can be set to 1650 r/min.
4, low frequency operation will increase the pressure turbine blade, cause the resonance of blades, shorten the service life of blade, and even make the blade fracture.
5, low frequency is run, the generator
of the ventilation rate will be reduced, in order to maintain normal voltage, increase excitation current requirements, increase the temperature rise of generator jingse and rotor, in order not to surpass temperature limits, had to lower electricity generators.
6, the low frequency is run, due to the magnetic flux density increases, the core loss and excitation current transformer will be increased.
In order not to surpass temperature limits, had to reduce the transformer load.
7, reduce the frequency, the system of the reactive power load will increase, lead to a decrease in the level of system voltage from the son.
Anyway, because of all the equipment is according to the system's rated frequency setting, a drop in the quality of the system frequency will affect all walks of life.
What and when frequency is too low, can make the whole system collapsed.
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