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Mobile box type grid power system for mechanical drilling rigs 
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The mobile box type variable frequency
is converted from an input 10KV high voltage switch to a 600V low voltage
through a transformer, and is protected by an incoming circuit breaker for
variable frequency. After passing through the incoming circuit breaker, it
enters the power grid converter and is converted into DC, which is then
converted into vector controlled AC through the motor converter and supplied to
the motor. Electric motors replace diesel engines to drive drilling equipment.
The AC
variable frequency speed control oil to electricity equipment consists of a
grid power inlet compartment, a frequency converter compartment, and an air
conditioning compartment. The internal inlet cabinets, transformers, frequency
converters, distribution cabinets, and air conditioning are all integrated into
a mobile electrical skid. The compartments are connected together through
cables.
|
system parameter |
rated voltage |
600V |
|
rated capacity |
2×1200kW |
|
|
Variable frequency topology |
two-level |
|
|
Efficiency |
≥97%（rated load） |
|
|
input |
AC voltage |
（600±5%）V |
|
Rectification method |
Six pulse rectification |
|
|
dc bus |
Rated DC voltage |
848V |
|
Maximum DC voltage |
1100V |
|
|
output |
Adaptive motor power |
2×1200kW |
|
Output voltage |
0~Uin（Incoming voltage） |
|
|
output current |
1168A continuous operation |
|
|
Frequency |
0~75Hz |
|
|
Overload capacity |
110% rated load 额定负载 rated load 额定负载 rated load |
|
|
Protection function |
Defect protection |
possess |
|
Overvoltage protection |
possess |
|
|
under voltage protection |
possess |
|
|
Overheat protection |
possess |
|
|
overload protection |
possess |
|
|
Overcurrent protection |
possess |
|
|
Short circuit protection |
possess |
|
|
Communication disconnection protection |
possess |
|
|
Motor fault protection |
possess |
|
|
Fast current limiting protection |
possess |
|
|
Operational control characteristics |
Motor control mode |
Vector control |
|
frequency resolution |
Digital setting: 0.1Hz; Simulation setting: 0.1% × Maximum frequency |
|
|
Frequency stability accuracy |
Digital setting: 0.1Hz; Analog setting: ± 0.2% × Maximum frequency |
|
|
Acceleration and deceleration time |
5-3000s arbitrary setting |
|
|
torque characteristic |
Constant torque below fundamental frequency, constant power above fundamental frequency |
|
|
Starting torque characteristics |
Can limit maximum starting torque, adaptive adjustment |
|
|
Operation control mode |
Local control, remote DCS control, remote communication control |
|
|
User DCS interface |
Analog input: (4-20) mA/(0-10) V default 2-way input |
|
|
Relay output: 250Vac/8A, 24Vdc/8A |
||
|
anti-jamming performance |
Design with self disturbance rejection function |
|
|
Other functions |
Automatic current limiting control, overvoltage stall control, automatic voltage adjustment, load change following control functions, etc |
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