9672 transformer protection unit

 
The 9672 transformer protection unit mainly used in the distribution transformer protection, station transformer protection and Grounding transformer protection that the voltage level of 110KV,66KV,35kV,10kV and 6kV voltage that directly turned into 380V and have the function of measurement, control, remote and communication.it not only can group screen intensively but also can put in the switch cabinet dispersedly. the 9672 also is suitable for medium and small transformer protection, and also the General electric power sector and industrial and mining enterprises transformer. If you need the main transformer protection unit, you can choose our company's 968X and 969X series main transformer protection unit.
protection function Of the 9672 transformer protection unit 
        current instantaneous trip protection
        time delay  current instantaneous trip protection
        Over-current protection
        Overload protection (overload alarm, overload trip)
        Zero sequences overcurrent protection (zero sequences over current, zero-sequence voltage lockout, zero sequence direction, zero sequence trip)
        Low voltage protection (trip)
        Busbar protection (alarm)
        PT line break Protection (alarm)
        Non-electricity protection－ 
        light Buchholtz－ alarm
        heavy Buchholtz－ trip 
     temperature rise  － trip 
        Temperature is too high－ trip  
 
control functions of the 9672 transformer protection unit measurement 
        Bus voltage：Uab、Ubc、Uca；Ua、Ub、Uc
        measuring current  ：Ia、 Ib、 Ic
        power ：P、Q、cosФ
        frequency ：f
 
the auxiliary function of  the 9672 transformer protection
        control circuit break
        Manual switching on and switching off
        remote control switching on and switching off
        Fault recording
 
communication mode of  the 9672 transformer protection unit
        485communication 
        Ethernet communication
        Optical fiber communication
 
the principle of action Of 9672 transformer protection unit
current instantaneous trip protection
        1．RLP1  current instantaneous trip protection－“投”；
        2．Protection current IA（IB）IC Any phase sampling value ≧ Fixed value of current instantaneous trip protection  （Idz0）
Protect immediate exit C7/C8, Simultaneous drive accident signal relay C1/C3（Return after 10s）. Panel accident light.
 
2．time delay  current instantaneous trip protection
        1．RLP2  time delay current instantaneous trip protection－“input”；
        2．Protection current IA（IB）IC Any phase sampling value≧ fixed value of the time delay current instantaneous trip protection （Idz1）
        3．Add current time ≧time delay current instantaneous trip  tzd1
        Protect immediate exit C7/C8，Simultaneous drive accident signal relay C1/C3（Return after 10s）. Panel accident light
 
Over-current protection  
        1．RLP3  Over current－“input”
        2．Protection current IA（IB）IC Any phase sampling value≧ Current setting value（Idz2）
        3．Add current time ≧Over current delay tzd2
Protect immediate exit C7/C8, Simultaneous drive accident signal relay C1/C3（Return after 10s）. Panel accident light.
        4．Low voltage blocking over current.（Need to put "over current" protection at the same time and the PT not line break and PT, not loss pressure）
        Low voltage judge Uca line voltage, At a certain phase, the current is greater than the set value. Uca line voltage is less than the set value（General low voltage set value of 70V) can be protected when the action, It is mainly used for the discrimination of voltage symmetrical short circuit, and the negative sequence voltage.
        5．Negative sequence voltage blocking over current（Need to put "over current" protection at the same time and the PT, not line break, PT not loss pressure）
 
        Negative sequence voltage is mainly used for voltage asymmetric short circuit, At a certain phase, the current is greater than the set value. Negative sequence voltage is greater than the set value（General negative sequence voltage setting value is 7V）then protection act
 
        explain：put into the "over current at the same time, low voltage blocking over current, negative sequence voltage blocking off the flow,it can reduce the transient current,It can also guarantee the action of the protection when the voltage appears symmetrical short circuit and the asymmetrical short circuit.
 
Protection for Overload   
        1．RLP6   overload  －“input”；
        2．Protection current IA（IB）IC Any phase sampling value≧ Overload value（Idz3）
        3．Add current time ≧Overload delay tzd3
        Protection for immediately driving alarm signal relay C2/C3（Return after 10s）.Panel warning light
 
description：Over load if required trip then need 
        1．RLP6    overload  －input
        2．RLP7  Overload trip－input
        3．Protection current IA（IB）IC Any phase sampling value ≧ Overload value（Idz3）
        4．Add current time ≧ Overload delay tzd3
        Protect immediate exit C7/C8 and Simultaneous drive accident signal relay C1/C3（Return after 10s）Panel accident light.
 
Zero sequences overcurrent protection
        1．RLP9  High side zero-sequence over current－input
        2． zero-sequence current 3Io sampling value  ≧ Zero sequence over current（Iodz）
        Add current time ≧High side zero-sequence overcurrent delay tozd
        Protection for immediately driving alarm signal relay C2/C3（Return after 10s）.The panel warning light is on.
 
Description: zero-sequence over current trip if required, the need to
        1．RLP9  High side zero-sequence over current－input
        2．RLP10  High side zero-sequence over current trip－input
        Add current time ≧High side zero-sequence over current delay tozd
        Protect immediate exit C7/C8, Simultaneous drive accident signal relay C1/C3（Return after 10s）Panel accident light.
 
Low-frequency load shedding
        1．RLP15 Low-frequency load shedding－input
        2．Frequency sampling value of protection unit ≦ Low-frequency load shedding（fdz1）
        3．(Frequency sampling value of protection unit ≦Low-frequency load shedding （time of fdz1）≧ Low-frequency load shedding I delayed tfzd1
        Protect immediate exit C7/C8, Simultaneous drive accident signal relayC1/C3（Return after 10s）Panel accident light.
 
PT line break alarm
        1．RLP17  PT line break－input
        2．Sampling value of the zero-sequence voltage of protection unit≦ fixed value of PT line break（3Uo1）
        3．The difference between the maximum phase voltage and the minimum phase voltage≧fixed value of  PT line break or Calculation of zero-sequence voltage ≧10V
        4．（Sampling value of the zero-sequence voltage of protection unit ≧set value of PT line Break set value（3Uo1））（Tzd3）
        Meet the above four conditions unit delay 10s, the PT line break alarm action, Protection for immediately driving alarm signal relay C2/C3（Return after 10s）Panel warning light
 
Bus ground alarm
        1．RLP18 Bus ground alarm－input
        2．Sampling value of the zero-sequence voltage of protection unit ≧Bus ground fixed value（3Uo2）
        3．（Sampling value of the zero-sequence voltage of protection unit ≧time of Bus ground fixed value（3Uo2））≧Bus ground delay（tzd3）
        Protection for immediately driving alarm signal relay C2/C3（Return after 10s）The panel warning light is on.
 
Low voltage protection
        1．RLP19  low voltage－input  Switch in position
        2．Any of the two-phase voltage sampling value ≦ Low voltage setting（Udz1）
        3．Low voltage sampling delay time ≧Low voltage delay（tuzd1）
        Protect immediate exitC7/C8, Simultaneous drive accident signal relay C1/C3（1Return after 0s）. Panel accident light
 
Control circuit break
        1．RLP8  control circuit －input
        2．Protection unit control circuit break time≧Control loop time delay（Tdz3）；
Protection for immediately driving alarm signal relay C2/C3（Return after 10s）.The panel warning light is on.
        illustration：The status of control loop disconnection is as follows：
        If the switch is in the position of switching on,  then send the information that the control loop is broken, the trip coil circuit is disconnected.
        If the switch is in the position of switching off, then send the information that the control loop is broken then  The closing coil circuit disconnect
        If the indicator of the switch's on and off is collected, then send the information that he control loop is broken 
        If the indicator of the switch's on and off is not collected, then send the information that he control loop is broken 
 
Non-electricity protection
        Non-electrical protection of transformer protection relay includes：heavy Buchholtz
        11、light Buchholtz
        12、Excessive temperature trip
        13, temperature rise R14
        For dry type transformer, then no the Light/heavy Buchholtz and have temperature signal
        1．RLP20  heavy Buchholtz－input 
        2．R11 then input to collect （From "0" to "1""）
        3． Protect immediate exit C7/C8, Simultaneous drive accident signal relay C1/C3（Return after 10s）Panel accident light.
 
illustration：
        1．High temperature trip situation with "heavy Buchholtz
        2．Light Buchholtz, Temperature rise only alarm signal, Panel "alarm" indicator light