Reactive power compensation device for starting high-power motor by limited-capacity power supply and use method
A power-starting, limited-capacity technology, applied in the direction of a single multi-phase induction motor starter, motor generator/starter, etc., can solve problems that affect the normal use of high-power equipment for users, motor shutdown, and excessive voltage drop. Achieve small line loss, ensure normal startup, and reduce the burden
Active Publication Date: 2013-09-11
LANZHOU ELECTRIC CORP
View PDF7 Cites 3 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The rated current of a low-voltage high-power asynchronous motor is often thousands of amperes. Although various step-down starting methods such as soft start are used, the starting current of the motor still reaches about three times the rated current. The maximum current lasts for a long time and the voltage drop is too large. Often the motor Before the start-up process is over, the limited-capacity power supply has been overwhelmed, causing the motor to stop, which affects the normal use of the user's high-power equipment
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0016] Such as figure 1 As shown, a reactive power compensation device for starting a high-power motor with a limited-capacity power supply, including contactors KM1~KM3, self-coupling transformer QZB, capacitor bank C, buttons SB1~SB5, indicator lights HL1~HL3 electrical components; KM1 controls the electrical components in series Input when the step-down reactor starts, KM2 controls the removal of the series step-down reactor after start-up, KM3 controls the input and removal of the parallel compensation capacitor bank; the lower pile heads U1, V1, W1 of the generator output circuit breaker are connected to the contactor KM2 The upper pile head of KM2, the lower pile head U2, V2, W2 of KM2 are connected to the upper pile head of contactor KM1, the lower pile head U3, V3, W3 of KM1 is connected to the primary side pile head of self-coupling transformer QZB, and the Output terminal (80%U E ) Pile heads U3, V3, W3 are connected in series to the input ends U4, V4, W4 of the sof...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a reactive power compensation device for starting a high-power motor by a limited-capacity power supply. The reactive power compensation device comprises contactors KM1-KM3, an auto-transformer QZB, a capacitor bank C, buttons SB1-SB5 and indicating lamps HL1-HL3. The KM1 controls input of a series voltage reduction reactor during starting, the KM2 controls cutting off of the series voltage reduction reactor after starting, and the KM3 controls input and cutting off of a parallel compensation capacitor bank. A use method includes: in a starting process of the motor, starting the series auto-transformer in a loop or starting the reactor in a voltage reduction mode, inputting the capacitor bank to compensate the motor, and after starting of the motor is finished, cutting off the reactor and the capacitor bank respectively. Starting current of the motor can be decreased greatly, load of the limited-capacity power supply is relieved, normal starting of the motor is guaranteed, high power factors and minimum line loss can be obtained, and the method is an economical and practical starting method. Aiming to solve the problem that low-voltage high-power motors are difficult to start in field operations such as geological exploration, oil exploration and well drilling, the reactive power compensation device has broad promotional value.
Description
technical field [0001] The invention relates to the field of motor impedance transformation, in particular to a reactive power device and a compensation method for further reducing the starting current when an asynchronous motor is started. Background technique [0002] With the rapid development of the country's modern industry, low-voltage high-power motors are used more and more in the independent power supply system of diesel generator sets, and the power capacity gradually increases accordingly. Under the condition of limited power of the diesel generator set, it is still very difficult to start the low-voltage high-power motor even though various decompression starting methods are used. Around the above problems, researches on new technologies and new methods are being carried out at home and abroad, but these technologies are only aimed at large-capacity grid power sources, which have great limitations in practical application, especially in the case of limited power ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H02P1/26
Inventor 李卫民曹立新邹明宝张琦
Owner LANZHOU ELECTRIC CORP