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General
SHM-D motor drive unit is the new intelligent digital control drive mechanism. It can be applied to the whole range of HM tap changers.
In past decades, the motor drive unit is the conventional system of electric-magnetic contactors with various mechanical cam switches. Its structure is clumsy with low reliability. According to the statistics, 75% of tap changer accident are found on MDU. Its mechanical components may easily go loose or corroded under challenging environment.
Based on cutting edge technologies from automation, astronautic and bullet train industry, Huaming designed the new MDU SHM-D. It can decrease the failure rate to 0.01%. By increasing on-line monitor functions, the tap changer operation will be more stable in the future.
3. Features.
3.1 All moveable components are run preciously by step motor, their operation
accuracy can reach 100%
3.2 Instead of copper wire, the connection between motor and controller is by
optical fiber cable.
3.3 Non-contact type high-precision sensor replaces traditional signal producer. It
has excellent resistance disturbance capability and ensure excellent performance
under various harsh environment.
3.4 *Various on-line monitor devices are equipped. This can ensure the tap changer
and transformer will be locked and given alarm for abnormal operation. It can even
indicate the oil temperature and alarm.
3.5 *It can detect the vacuum decrease in the vacuum interrupter and alarm.
3.6 *It can sense the wear out of arcing alloy contact and give signal when its
expectancy finishes.
3.7 Its cabinet box is made of high quality aluminium alloy plate material via
compressing and stretching. Its protection degree can reach IP66.
3.8 Double-sealed protection are applied on its cabinet
3.9 All electrical and mechanical components are with capability of disturbance
resistance .
3.10 It can detect the gas inside tap changer or transformer oil and operate the online
filter automatically.
3.11 It can regulate the voltage automatically, saving you the cost of AVR.
3.12 It can realize parallel operation without extra controller
3.13 Modular design.
3.14 High precision position transmitting system
3.15 It has a variety of communication interface and communication protocol, and
provides more choices for smart grid applications.
* Marked item should be applied in cooperative with the user's request.
4. Function and Operation condition
4.1 Function
4.1 .1 Manual operation and motor operation
4.1.2 Remote control or local control
4.1.3 Step-by-step operation, overrunning at special request.
4.1.4 Local position indication and remote position indication
4.1.5 Tap position display
4.1.6 Electrical and mechanical limit switch
4.1.7 Local operation button
4.1.8 Operation counter
4.1.9 Overload protection
4.1.10 Parallel control
4.1.11 Restart device
4.1.12 Protection against overrun
4.1.13 Standard optical fiber transmitting interface
4.1.14 Over-current blocking signal input
4.1.15 BCD signal output
4.1.16 Contact signal output
4.1.17 4-20mA or 1-5V analog output signal.
4.1.18 Operation status signal output.
4.1.19 Motor drive unit accident detection and locking device
4.2 Operation conditions
4.2.1 Ambient temperature -25-60ºC (Special designed low-temperature type can withstand -60ºC )
4.2.2 Installation vertical inclination is no more than 2%
4.2.3 No severe sand dust, explosives or corrosive gas is allowed for the site.
This technical data is only applied to the standard design. It may vary according to different request in technical specification. Huaming reserves the right to revise the data in this table.
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PRODUCTS. THANK YOU FOR YOUR SUPPORT AND COORDINATION.
WE WOULD LIKE TO PROVIDE OUR CUSTOMER WITH HIGH QUALITY PRODUCT,
EXCELLENT SERVICE AND PREFERENTIAL PRICE.
