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    Question 1:
    Which of the voltage stabilizer are the most common?
    Answer 1:
    Stepped voltage stabilizer: This stabilizer that is named “electricity transformer” in vulgar language, work in low power and changes and stabilizes voltage with use changing number of armature winder. Output accuracy of these systems is about 3 to 7 percent and has high correction speed.
    It isn’t suitable for consumptions that are sensitive for sudden changing because of voltage stabilization with 10 to 20 volt steps but it is suitable for domestic insensitive consumptions and that is not so expensive
    Answer 2:
    voltage stabilizer with system servo Motor: This system changes network electricity voltage and stabilize it by use of changing magnetic field in buck-boost transformer because of change the number of armatures in circuit of one ring shaped transformer. Correction accuracy of this system is in output of 1 percent and are suitable for voltage stabilization of sensitive medical and industrial users because of high correction accuracy. These systems are more precious and heavier than stepped stabilizer.

    Question 2 :
    Which are the kinds of U.P.S ?
    Answer 1:
    Offline U.P.S : In this kind of U.P.S the user directly uses network electricity when network is online and when the network become offline user uses U.P.S battery source . Time duration of battery source connection is about one second. This kind of U.P.S doesn’t do action for correction and stabilization of consumption electricity when network electricity is on. It is not suitable for users that have problem with momentary outage because of existence long time duration between outage and using saved current electricity in battery (like computer users). This kind of U.P.S almost abolished.
    Answer 2 :
    Line interactive U.P.S : In this kind of U.P.S when network is online at first electricity voltage stabilize by stepped stabilizer inside of the system and then transferred to user. When network is offline at duration of 0.01 second it use battery source. This kind of system is suitable for half sensitive consumptions and has much battery capacity. Settling next to sensitive users cause to creating noise in environment because of magnetic field that exist in transformer of system (like sonography system).
    Answer 3 :
    Online U.P.S : In this kind of U.P.S at first network electricity that is alternate changes to direct current electricity and saves in battery and user always use from battery. If user has had alternate current electricity, direct current electricity of battery always changes to alternate current electricity at first and then transferred to user. This kind of U.P.S is named double conversion because of continuance changing of alternate current electricity to direct current electricity and then vice versa. In this kind of U.P.S user always has stabilizer electricity and unless electricity cut and user electricity is completely isolated from network electricity.

    Question 3 :
    what is the isolation transformer and what is it’s application?
    Answer :
    Isolation transformer is a kind of electrical piece that isolate two electrical circuit from each other by means of one magnetic field, that is to say there isn’t any import connection between two lines of energy consequently imported electrical conditions isn’t established in output of transformer (There isn’t any connection with earth). This action of isolation transformer cause to necessary of voltage, in output of system, but because of non-connection to earth, at the time of connection, high potential difference with earth is zero and flowing doesn’t pass from connection and consequently electrical congestion doesn’t happen.
    Isolation transformer mostly is used in places that occasional connection between user and earth may be happen because of existing electrical energy and much moisture(like as operating rooms). Another application of isolation transformer is prevention of passing DC and at the time of entrance of thunderbolt shocks can prevent from passing much thunderbolt voltage to circuit of sensitive users.

    Question 4 :
    what is the responsibility insurance of production?
    Answer :
    In case systems seller have had responsibility insurance policy contract of production and at the time of remittance and system installation sellers complete mentioned insurance policy, buyer sign it and send two copy of that to insurance company. Insurance company recompense until certain extent when sold system demolished and if it is specified that destruction of system is because of electricity provider system problem or is because of non-correct operation.
    Voltage stabilizers of Sahand Keyvan Company have responsibility insurance of production.

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