CN115940740A - Automatic energy-saving compensation device of variable frequency control cabinet - Google Patents
Automatic energy-saving compensation device of variable frequency control cabinet Download PDFInfo
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- CN115940740A CN115940740A CN202111094507.4A CN202111094507A CN115940740A CN 115940740 A CN115940740 A CN 115940740A CN 202111094507 A CN202111094507 A CN 202111094507A CN 115940740 A CN115940740 A CN 115940740A
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Abstract
An automatic energy-saving compensation device of a variable frequency control cabinet belongs to the technical field of electricity saving of electrical equipment and comprises a three-phase power supply, a frequency converter, a capacitance compensation controller, an isolating switch QS, a power frequency control breaker QF1, a variable frequency control breaker QF2, a capacitance control breaker QF3, a control loop breaker QF4, a variable frequency operation contactor KM1, a power frequency operation contactor KM2, a capacitance control contactor KM3, a capacitance control contactor KM4, a capacitance control contactor KM5, a thermal relay FR, a three-phase asynchronous motor M, a stop button SB1, a start button SB2, a change-over switch SA, a time relay KT, a capacitor C1, a capacitor C2 and a capacitor C3, wherein L1 wires, L2 wires and L3 wires which are led out from the three-phase power supply are connected with the power frequency control breaker QF1 through a normally open switch of the power frequency operation contactor KM2, the power frequency control breaker QF1 is connected with the thermal relay FR through the normally open switch of the power frequency operation contactor KM2, and three wires which are led out for the first time from the thermal relay FR are connected with the three-phase asynchronous motor M; the invention reduces reactive power and saves electric quantity.
Description
Technical Field
The invention belongs to the technical field of power saving of electrical equipment, and particularly relates to an automatic energy-saving compensation device of a variable frequency control cabinet.
Background
At present, the frequency conversion cabinet of the oil pumping unit controlled on site in oil field production is seriously damaged, most oil pumping units are in a power frequency running state, so that the power factor of a power distribution system is greatly reduced, and the electric charge is seriously exceeded.
Disclosure of Invention
In order to solve the problem of low power factor of a distribution line when an oil pumping unit operates at power frequency, the invention provides: an automatic energy-saving compensation device of a variable frequency control cabinet has the following technical scheme: the three-phase power supply thermal relay comprises a three-phase power supply, an isolating switch QS, a power frequency control circuit breaker QF1, a three-phase asynchronous motor M, a thermal relay FR and a power frequency operation contactor KM2, wherein an L1 line, an L2 line and an L3 line which are led out by the three-phase power supply pass through the isolating switch QS and the power frequency control circuit breaker QF1, the power frequency control circuit breaker QF1 passes through a normally open switch KM21 of the power frequency operation contactor KM2 and the thermal relay FR, and three lines led out by the thermal relay FR for the first time are connected with the three-phase asynchronous motor M.
The intelligent relay is characterized by further comprising a frequency converter, a frequency conversion control circuit breaker QF2 and a frequency conversion operation contactor KM1, wherein three wires led out of the thermal relay FR for the second time are connected with wiring terminals U, V and W of the frequency converter through a normally open switch KM11 of the frequency conversion operation contactor KM1, and wiring terminals R, S and T of the frequency converter are respectively connected with an L1 wire, an L2 wire and an L3 wire led out from the three-phase power supply through the frequency conversion control circuit breaker QF2 in sequence.
Further, the device comprises a capacitance control circuit breaker QF3, a capacitance control contactor KM4, a capacitance control contactor KM5, a capacitance C1, a capacitance C2 and a capacitance C3, wherein three wires led out by the thermal relay FR for the third time are connected with the capacitance control circuit breaker QF3, the three wires led out by the capacitance control circuit breaker QF3 for the first time are connected with a normally open switch KM3 'of the capacitance control contactor KM3, the three wires led out by the capacitance control circuit breaker QF3 for the second time are connected with a normally open switch KM4' of the capacitance control contactor KM4, the three wires led out by the capacitance control circuit breaker QF3 for the third time are connected with a normally open switch KM5 'of the capacitance control contactor KM5, the normally open switch KM3' is connected with the capacitance C1, the normally open switch KM4 'is connected with the capacitance C2, and the normally open switch KM5' is connected with the capacitance C3.
Further, still include stop button SB1, start button SB2 and change over switch SA, the L2 line that three phase current drawn forth pass through control loop circuit breaker QF4 with the normally closed switch FR 'of thermal relay FR links to each other, normally closed switch FR' through stop button SB1 with start button SB2 links to each other, start button SB2 respectively with the normally open switch KM13 of frequency conversion operation contactor KM1, the normally open switch KM22 parallel connection of power frequency operation contactor KM2, start button SB2 through change over switch SA respectively with the normally closed switch KM12 of frequency conversion operation contactor KM1, the normally closed switch KM23 of power frequency operation contactor KM2 link to each other, normally closed switch KM12 with power frequency operation contactor KM2 links to each other, normally closed switch KM23 with frequency conversion operation contactor KM1 links to each other.
Further, still include time relay KT, the L1 line that three phase current drawn forth pass through control circuit breaker QF4 with frequency conversion operation contactor KM 1's normally closed switch KM14 links to each other, normally closed switch KM14 through power frequency operation contactor KM 2's normally open switch KM24 with time relay KT links to each other.
Further, still include capacitance compensation controller, capacitance control contactor KM3, capacitance control contactor KM4, capacitance control contactor KM5, the L1 line that three phase current drawn forth through control loop circuit breaker QF4 with time relay KT's normally open switch KT' links to each other, normally open switch KT 'with capacitance compensation controller's A1 terminal links to each other.
Further, a terminal k1 of the capacitance compensation controller is connected to the capacitance control contactor KM3, a terminal k2 of the capacitance compensation controller is connected to the capacitance control contactor KM4, and a terminal k3 of the capacitance compensation controller is connected to the capacitance control contactor KM 5.
Furthermore, the A2 terminals of the variable-frequency operation contactor KM1, the power-frequency operation contactor KM2, the capacitance control contactor KM3, the capacitance control contactor KM4, the capacitance control contactor KM5, the time relay KT and the capacitance compensation controller are connected in parallel.
The invention has the beneficial effects that:
the reactive power in the distribution line when the power frequency operates is reduced, the purpose of saving electricity is achieved, and the electricity charge expenditure is reduced. The invention adopts the interlocking of the power and the variable frequency contactors to ensure that the compensation box can not be put into operation absolutely when the variable frequency control cabinet operates in a variable frequency mode, and because the input capacitor can damage the frequency converter when the variable frequency control cabinet operates in the variable frequency mode, the power and the variable frequency control cabinet never use the compensation capacitor. The compensation box can be put into operation in a delayed mode, and therefore the situation that the capacitor is burnt out due to frequent starting when the oil pumping well collides with a pump or is in operation construction is avoided. The input quantity of the capacitors is controlled by the compensation controller, and the capacitance compensation quantity is reasonably controlled.
Drawings
FIG. 1 is a circuit diagram of an automatic energy-saving compensation device of a variable frequency control cabinet;
fig. 2 is a structural diagram of an automatic energy-saving compensation device of a variable frequency control cabinet.
Detailed Description
Example 1
As shown in fig. 1-2, an automatic energy-saving compensation device for a variable frequency control cabinet comprises a three-phase power supply, an isolating switch QS, a power frequency control circuit breaker QF1, a three-phase asynchronous motor M, a thermal relay FR and a power frequency operation contactor KM2, wherein an L1 line, an L2 line and an L3 line led out from the three-phase power supply are connected with the power frequency control circuit breaker QF1 through the isolating switch QS, the power frequency control circuit breaker QF1 is connected with the thermal relay FR through a normally open switch KM21 of the power frequency operation contactor KM2, and three lines led out from the thermal relay FR for the first time are connected with the three-phase asynchronous motor M.
The intelligent relay is characterized by further comprising a frequency converter, a frequency conversion control circuit breaker QF2 and a frequency conversion operation contactor KM1, wherein three wires led out of the thermal relay FR for the second time are connected with wiring terminals U, V and W of the frequency converter through a normally open switch KM11 of the frequency conversion operation contactor KM1, and wiring terminals R, S and T of the frequency converter are sequentially connected with an L1 wire, an L2 wire and an L3 wire led out from a three-phase power supply through the frequency conversion control circuit breaker QF 2.
The three lines led out by the thermal relay FR for the third time are connected with a normally open switch KM3' of the capacitance control contactor KM4, the three lines led out by the capacitance control breaker QF3 for the first time are connected with a normally open switch KM3' of the capacitance control contactor KM3, the three lines led out by the capacitance control breaker QF3 for the second time are connected with a normally open switch KM4' of the capacitance control contactor KM4, the three lines led out by the capacitance control breaker QF3 for the third time are connected with a normally open switch KM5' of the capacitance control contactor KM5, the normally open switch KM3' is connected with the capacitance C1, the normally open switch KM4' is connected with the capacitance C2, and the normally open switch KM5' is connected with the capacitance C3.
Wherein, still include stop button SB1, start button SB2 and change over switch SA, the L2 line that three phase current source drawed out pass through control circuit breaker QF4 with the normally closed switch FR 'of thermal relay FR links to each other, normally closed switch FR' through stop button SB1 with start button SB2 links to each other, start button SB2 respectively with normally open switch KM13 of frequency conversion operation contactor KM1, the normally open switch KM22 parallel connection of power frequency operation contactor KM2, start button SB2 through change over switch SA respectively with normally closed switch KM12 of frequency conversion operation contactor KM1, the normally closed switch KM23 of power frequency operation contactor KM2 link to each other, normally closed switch KM12 with power frequency operation contactor KM2 links to each other, normally closed switch KM23 with frequency conversion operation contactor KM1 links to each other.
The intelligent power supply system further comprises a time relay KT, an L1 line led out by the three-phase power supply is connected with a normally closed switch KM14 of the variable-frequency operation contactor KM1 through a control loop breaker QF4, and the normally closed switch KM14 is connected with the time relay KT through a normally open switch KM24 of a power frequency operation contactor KM 2.
Wherein, still include capacitance compensation controller, capacitance control contactor KM3, capacitance control contactor KM4, capacitance control contactor KM5, the L1 line that three phase current drawn forth pass through control circuit breaker QF4 with time relay KT's normally open switch KT' links to each other, normally open switch KT 'with capacitance compensation controller's A1 terminal links to each other.
The k1 terminal of the capacitance compensation controller is connected with the capacitance control contactor KM3, the k2 terminal of the capacitance compensation controller is connected with the capacitance control contactor KM4, and the k3 terminal of the capacitance compensation controller is connected with the capacitance control contactor KM 5.
The frequency conversion operation contactor KM1, the power frequency operation contactor KM2, the capacitance control contactor KM3, the capacitance control contactor KM4, the capacitance control contactor KM5, the time relay KT and the A2 terminal of the capacitance compensation controller are connected in parallel.
An automatic energy-saving compensation device of a variable frequency control cabinet mainly aims at the problems that the variable frequency cabinet of an oil field production field control pumping unit is seriously damaged, most pumping units are in a power frequency running state, so that the power factor of a power distribution system is greatly reduced, and the electric charge is seriously exceeded. Therefore, the energy-saving control compensation box special for the variable frequency control cabinet is designed and assembled. The energy-saving compensation box is arranged on one side of the variable-frequency control cabinet, and when the variable-frequency control cabinet is in a variable-frequency operation state, the compensation box automatically cuts off a power supply and quits operation; when the variable frequency control cabinet is in a power frequency operation state, the compensation box control circuit is electrified. Through time relay time delay, the use of the interlocking of the power and the frequency conversion contactor ensures that the reactive power automatic control compensator is electrified after the frequency conversion circuit is disconnected, monitors the system power factor at the moment, and controls the contactor to pull in according to the high and low power number, thereby achieving the purpose of controlling the switching quantity of the capacitor and enabling the system power factor to achieve the optimal effect. The invention has the advantages of simple installation, flexible operation and good electricity-saving effect.
When the frequency conversion cabinet change-over switch SA is changed to a frequency conversion operation mode, the starting button SB2 is pressed, the contactor KM1 is attracted, and the motor starts to operate in a frequency conversion mode. When the frequency conversion cabinet is in a frequency conversion operation state, the normally closed contact KM1 of the contactor is disconnected, the time relay coil KT cannot be electrified, and the compensation device cannot be started. Because when the converter is in the frequency conversion running state, capacitance compensation can cause the electric current impact to the converter, burns out the converter, so the frequency conversion switch board does not adopt capacitance compensation device. When the frequency conversion cabinet is switched to a power frequency operation mode. And (3) converting the conversion switch SA of the frequency conversion cabinet into a power frequency operation mode, pressing a starting button SB2, attracting a contactor KM2, and starting and operating the motor at power frequency. At the moment, the normally closed contact of the contactor KM1 is closed, the KM2 normally open contact is closed, the coil of the time relay KT is electrified and delayed for 10 seconds, the normally open contact KT of the time relay is closed, and the coil of the capacitance compensation controller is electrified and operated. The capacitance compensation controller detects the real-time power factor of the system, controls the suction quantity of the contactors KM3, KM4 and KM5, and controls the input quantity of the capacitors C1, C2 and C3, so that the power factor of the system is more accurately controlled, and the power factor is usually set to be less than 0.85 for operation and more than 0.95 for off-operation.
The compensation device is started after delaying for 10 seconds, and the purpose of delaying is to ensure that the frequency converter is thoroughly disconnected from a power supply and technically avoid the occurrence of the accident of burning the frequency converter; and secondly, the capacitor damage caused by frequent capacitor investment during power frequency inching operation is avoided. The automatic compensation controller monitors the power factor of the operation of the pumping unit, and automatically controls the input quantity of the capacitors according to the power factor so as to achieve the optimal compensation.
After the energy-saving compensation box is put into use, the efficiency of the oil well actual measurement system can increase the power frequency power factor from 0.27 to over 0.75, and the three-phase average current is reduced from 44.9 amperes to 20.5 amperes; the power factor is improved, the power loss of a power transmission system can be reduced, the service efficiency of electrical equipment is improved, and the excess of electric charge is reduced.
The invention reduces the reactive power in the distribution line when the power frequency operates, achieves the purpose of saving electricity and reduces the electricity charge expenditure. The invention adopts the interlocking of the power and the variable frequency contactors to ensure that the compensation box can not be put into operation absolutely when the variable frequency control cabinet operates in a variable frequency mode, and because the input capacitor can damage the frequency converter when the variable frequency control cabinet operates in the variable frequency mode, the power and the variable frequency control cabinet never use the compensation capacitor. The compensation box can be put into operation in a delayed mode, and therefore the situation that the capacitor is burnt out due to frequent starting when the oil pumping well collides with a pump or is in operation construction is avoided. The input quantity of the capacitors is controlled by the compensation controller, and the capacitance compensation quantity is reasonably controlled.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and their concepts should be equivalent or changed within the technical scope of the present invention.
Claims (8)
1. The utility model provides an automatic energy-conserving compensation arrangement of variable frequency control cabinet, its characterized in that includes three phase current, isolator QS, power frequency control circuit breaker QF1, three-phase asynchronous motor M, thermorelay FR and power frequency operation contactor KM2, the L1 line, L2 line, the L3 line that three phase current drawn forth pass through isolator QS with power frequency control circuit breaker QF1 links to each other, power frequency control circuit breaker QF1 passes through power frequency operation contactor KM 2's normally open switch KM21 with thermorelay FR links to each other, the first three lines of drawing forth of thermorelay FR with three-phase asynchronous motor M links to each other.
2. The automatic energy-saving compensation device of the variable-frequency control cabinet according to claim 1, further comprising a frequency converter, a variable-frequency control circuit breaker QF2 and a variable-frequency operation contactor KM1, wherein the three wires led out from the thermorelay FR for the second time are connected to the connection terminals U, V and W of the frequency converter through a normally open switch KM11 of the variable-frequency operation contactor KM1, and the connection terminals R, S and T of the frequency converter are connected to the L1 wire, the L2 wire and the L3 wire led out from the three-phase power supply through the variable-frequency control circuit breaker QF2 respectively in sequence.
3. The automatic energy-saving compensation device of the variable-frequency control cabinet according to claim 2, further comprising a capacitive control breaker QF3, a capacitive control contactor KM4, a capacitive control contactor KM5, a capacitor C1, a capacitor C2 and a capacitor C3, wherein three wires led out from the thermal relay FR for the third time are connected to the capacitive control breaker QF3, three wires led out from the capacitive control breaker QF3 for the first time are connected to a normally open switch KM3 'of the capacitive control contactor KM3, three wires led out from the capacitive control breaker QF3 for the second time are connected to a normally open switch KM4' of the capacitive control contactor KM4, three wires led out from the capacitive control breaker QF3 for the third time are connected to a normally open switch KM5 'of the capacitive control contactor KM5, a switch KM3' is connected to a capacitor C1, a normally open switch KM4 'is connected to a capacitor C2, and a normally open switch KM5' is connected to a capacitor C3.
4. The automatic energy-saving compensation device of a variable-frequency control cabinet according to claim 3, further comprising a stop button SB1, a start button SB2 and a transfer switch SA, wherein the L2 line drawn from the three-phase power supply is connected to the normally closed switch FR 'of the thermal relay FR through a control loop breaker QF4, the normally closed switch FR' is connected to the start button SB2 through the stop button SB1, the start button SB2 is connected in parallel to the normally open switch KM13 of the variable-frequency operation contactor KM1 and the normally open switch KM22 of the power-frequency operation contactor KM2, respectively, the start button SB2 is connected to the normally closed switch KM12 of the variable-frequency operation contactor KM1 and the normally closed switch KM23 of the power-frequency operation contactor KM2 through the transfer switch SA, the normally closed switch KM12 is connected to the power-frequency operation contactor KM2, and the normally closed switch KM23 is connected to the variable-frequency operation contactor KM 1.
5. The automatic energy-saving compensation device of the variable-frequency control cabinet as claimed in claim 4, further comprising a time relay KT, wherein the L1 line from the three-phase power supply is connected with a normally closed switch KM14 of the variable-frequency operation contactor KM1 through a control loop breaker QF4, and the normally closed switch KM14 is connected with the time relay KT through a normally open switch KM24 of a power-frequency operation contactor KM 2.
6. The automatic energy-saving compensation device of the variable-frequency control cabinet as claimed in claim 5, further comprising a capacitance compensation controller, a capacitance control contactor KM3, a capacitance control contactor KM4 and a capacitance control contactor KM5, wherein the L1 line led out from the three-phase power supply is connected with a normally open switch KT 'of the time relay KT through a control loop breaker QF4, and the normally open switch KT' is connected with the A1 terminal of the capacitance compensation controller.
7. The automatic energy-saving compensation device of the variable-frequency control cabinet according to claim 6, wherein the terminal k1 of the capacitance compensation controller is connected to the capacitance control contactor KM3, the terminal k2 of the capacitance compensation controller is connected to the capacitance control contactor KM4, and the terminal k3 of the capacitance compensation controller is connected to the capacitance control contactor KM 5.
8. The automatic energy-saving compensation device of the variable-frequency control cabinet as claimed in claim 7, wherein the terminals A2 of the variable-frequency operation contactor KM1, the power-frequency operation contactor KM2, the capacitance control contactor KM3, the capacitance control contactor KM4, the capacitance control contactor KM5, the time relay KT and the capacitance compensation controller are connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111094507.4A CN115940740A (en) | 2021-09-17 | 2021-09-17 | Automatic energy-saving compensation device of variable frequency control cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111094507.4A CN115940740A (en) | 2021-09-17 | 2021-09-17 | Automatic energy-saving compensation device of variable frequency control cabinet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115940740A true CN115940740A (en) | 2023-04-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111094507.4A Pending CN115940740A (en) | 2021-09-17 | 2021-09-17 | Automatic energy-saving compensation device of variable frequency control cabinet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115940740A (en) |
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2021
- 2021-09-17 CN CN202111094507.4A patent/CN115940740A/en active Pending
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