CN210380259U - Voltage regulating system for low-voltage line - Google Patents
Voltage regulating system for low-voltage line Download PDFInfo
- Publication number
- CN210380259U CN210380259U CN201921598750.8U CN201921598750U CN210380259U CN 210380259 U CN210380259 U CN 210380259U CN 201921598750 U CN201921598750 U CN 201921598750U CN 210380259 U CN210380259 U CN 210380259U
- Authority
- CN
- China
- Prior art keywords
- voltage
- circuit
- transformer
- low
- switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model provides a voltage regulation system for low voltage circuit, this system increase one on the basis of original circuit and step up potential device and compensation potential device, and it passes through control loop control contactor KM1, switch K1Switch K2And the two-gear compensation transformer and the like realize switching voltage regulation, and the output voltage can be improved by 0-40%, so that the voltage regulator has the advantages of large boosting range, good flexibility, high reflection speed, good output waveform and the like compared with the traditional voltage regulator. In addition, the voltage regulating system has the characteristics of simple control and safe and reliable equipment operation, is suitable for places with dispersed low-voltage power grid terminal loads, and is particularly suitable for low-voltage line supply of rural power gridsThe power supply is used in places with longer electric radius, smaller load of a rear-section line and larger voltage drop, and can solve the problem of ultralow voltage at the tail end of a remote rural power grid.
Description
Technical Field
The utility model relates to a voltage regulation technical field especially relates to a voltage regulation system for low voltage circuit.
Background
The low voltage line is a line with a voltage of 220/380 v, and is usually connected to the user side. In the process of transmitting the voltage to the user through the low-voltage line, the voltage needs to be adjusted through the voltage adjusting device. At present, a voltage regulating device in a rural power grid is generally a step-up transformer. After the voltage is boosted by the boosting transformer, the voltage output by the output end of the boosting transformer is boosted, so that the boosting transformer has certain effect on boosting the voltage. However, the voltage boost degree of the step-up transformer is not high, and especially in a low-voltage line with a long low-voltage line, a light load and a large voltage drop loss, the voltage regulation effect of the step-up transformer is not obvious.
SUMMERY OF THE UTILITY MODEL
The utility model provides a voltage regulation system for low voltage circuit has solved the not good problem of voltage regulation effect in the present low voltage circuit.
The utility model provides a voltage regulation system for low voltage circuit, include: the device comprises a control loop, and an input sampling circuit, an input circuit, an output sampling circuit, a bypass circuit, a through circuit, a boosting transformation device and a compensation transformation device which are respectively connected with the control loop;
the input sampling circuit is respectively connected with the input circuit and the bypass circuit;
the output sampling circuit is respectively connected with the output circuit and the bypass circuit;
the boosting transformation device is respectively connected with the input circuit, the through circuit and the compensation transformation device;
the compensation transformation device and the through circuit are respectively connected with the output circuit.
Preferably, the boosting transformation device and the compensation transformation device are both connected with a zero line.
Preferably, the step-up transformer device comprises a step-up transformer and a circuit breaker, one end of the step-up transformer is connected to the input end Li through a current transformer and a lightning arrester, and the other end of the step-up transformer is respectively connected with the circuit breaker and the compensation transformer device.
Preferably, the compensation transformation device comprises a compensation transformer, a contactor KM1 and a switch K1And switch K2One end of the contactor KM1 is connected with the input circuit, and the other end is respectively connected with the output end L0Switch K1And switch K2(ii) a The switch K1Is connected with the contactor KM1, and the other end is connected with the compensation transformer X2Shifting; the switch K2Is connected with the contactor KM1, and the other end is connected with the compensation transformer X1And (4) shifting.
The embodiment of the utility model provides a technical scheme can include following beneficial effect:
the utility model provides a voltage regulation system for low voltage circuit, include: the device comprises a control loop, and an input sampling circuit, an input circuit, an output sampling circuit, a bypass circuit, a through circuit, a boosting transformation device and a compensation transformation device which are respectively connected with the control loop; the input sampling circuit is respectively connected with the input circuit and the bypass circuit; the output sampling circuit is respectively connected with the output circuit and the bypass circuit; the boosting transformation device is respectively connected with the input circuit, the through circuit and the compensation transformation device; the compensation transformation device and the through circuit are respectively connected with the output circuit. In the voltage regulation system for the low-voltage line, a boosting transformation device and a compensation transformation device are added on the basis of the original circuit, and the control loop controls the contactor KM1 and the switch K1Switch K2And two-stage compensation transformerThe output voltage can be increased by 0-40% by switching voltage regulation, so that the voltage regulator has the advantages of large voltage-boosting range, good flexibility, high response speed, good output waveform and the like compared with the traditional voltage regulator. In addition, the voltage regulating system has the characteristics of simplicity in control and safety and reliability in equipment operation, is suitable for places with dispersed low-voltage power grid terminal loads, is particularly suitable for places with longer power supply radius of low-voltage lines of rural power grids, smaller loads of rear-section lines and larger voltage drop, and can solve the problem of ultralow voltage at the tail end of remote rural power grids.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a schematic diagram of a connection structure of a voltage regulation system for a low voltage line according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a voltage regulation system for a low voltage line according to an embodiment of the present invention;
fig. 3 is a flowchart of the operation of the voltage regulation system for low voltage lines according to an embodiment of the present invention;
the symbols represent:
the circuit comprises a control loop 1, an input sampling circuit 2, an input circuit 3, an output circuit 4, an output sampling circuit 5, a bypass circuit 6, a direct circuit 7, a boosting and transforming device 8 and a compensating and transforming device 9.
Detailed Description
Referring to fig. 1 and 2, fig. 1 and 2 respectively show a schematic connection structure diagram and a schematic circuit diagram of a voltage regulation system for a low voltage line according to an embodiment of the present invention. As shown in fig. 1 and 2, the voltage regulation system for a low-voltage line provided in the embodiment of the present application includes a control loop 1, and an input sampling circuit 2, an input circuit 3, an output circuit 4, an output sampling circuit 5, a bypass circuit 6, a pass-through circuit 7, a step-up transformer 8, and a compensation transformer 9, which are respectively connected to the control loop 1. Specifically, the input sampling circuit 2 is also connected with the input circuit 3 and the bypass circuit 6 respectively; the output sampling circuit 5 is connected to the output circuit 4 and the bypass circuit 6, respectively. The boosting transformation device 8 is respectively connected with the input circuit 3, the through circuit 7 and the compensation transformation device 9. The compensating transformer device 9 and the through circuit 7 are also respectively connected with the output circuit 4. In the embodiment of the present application, the step-up transformer 8 and the compensation transformer 9 are further respectively connected to the zero line N, so as to implement the voltage regulation function.
Specifically, the step-up transformer 8 includes a step-up transformer TB1 and a breaker QF. One end of the step-up transformer TB1 is connected to the input end Li through the power transformer TA1 and the lightning arrester FV, and the other end is connected to the input ends of the breaker QF and the compensation transformer device 9 respectively. The setting of arrester FV can be right the embodiment of the utility model provides a voltage regulation system for low-voltage line plays the guard action. When the input voltage is lower, the boosting and transforming device 8 enters a boosting working state; when the input voltage approaches the rated voltage value, the step-up transformer 8 exits the step-up state and directly enters the bypass conduction state, i.e. enters the bypass circuit.
The compensation transformation device 9 comprises a compensation transformer, a contactor KM1 and a switch K1And switch K2Wherein the compensating transformer comprises X1Gear and X2The two gears can be switched to different gears according to specific values of output voltage, so that voltage in a certain range can be adjusted, and the power supply system is suitable for wide rural power grid power supply areas. In the compensation transformer device 9, one end of the contactor KM1 is connected with the input circuit 3, and the other end is respectively connected with the output end L0Switch K1And switch K2. Switch K1One end of the voltage-stabilizing switch is connected with a contactor KM1, and the other end is connected with a compensating transformer X2And (4) shifting. Switch K2One end of the voltage-stabilizing switch is connected with a contactor KM1, and the other end is connected with a compensating transformer X1And (4) shifting. When the step-up transformer 8 is in operation, the output sampling voltage still cannot satisfy the quotaWhen the voltage is fixed, the compensation voltage transformation device 9 enters a compensation voltage working state according to the gear sequence; if the output sampling voltage is higher than the rated voltage limit value, the compensation voltage transformation device 9 sequentially exits the compensation voltage working state according to the gear sequence and enters the voltage regulation circuit of the boosting voltage transformation device 8 working state.
In the embodiment of the application, the control loop 1 changes the output turn ratio of the compensating transformer to realize the adjustment and control of the working states of the boosting transformation device 8 and the compensating transformation device 9 by controlling the conduction of the contactors of the boosting transformer and the compensating transformer. In particular, as shown in fig. 3, when the input voltage is within the nominal value range, power is supplied by the bypass circuit 6. When the input voltage fluctuates or the load changes, the input sampling circuit 2 adopts the input voltage in the input circuit 3, and the output sampling circuit 5 adopts the output voltage in the output circuit 4, so that the voltage sampling is realized. The collected input voltage and output voltage are sent to the control circuit 1, the control circuit 1 compares and judges the input voltage and the output voltage with the reference voltage, and then the control circuit 1 outputs control signals to the boosting transformation device 8 and the compensation transformation device 9. If the input voltage is low, the step-up transformer 8 enters a step-up operating state. If the input voltage is close to the rated voltage value, the step-up transformer device 8 exits the operation state and directly enters the bypass conduction state, namely, the bypass circuit is accessed. When the boosting transformer device 8 is in a boosting working state, if the output voltage is still lower than the lower limit value of the rated voltage, the compensation transformer enters a working state. If the output voltage is higher than the upper limit value of the rated voltage, the compensation transformer device 9 exits the working state. When the system is over-current, the control loop 1 exits the voltage regulating circuit, and the bypass circuit is conducted. In addition, the control circuit 1 can also control the direct current circuit 7 to prevent the boosting transformer 8 and the compensation transformer 9 from being burnt due to overhigh voltage or system overcurrent.
In particular, when the input voltage U isiWhen the voltage is lower than 187V, the control loop 1 controls the action of the contactor KM1, and the breaker QF is conducted. At the moment, the step-up transformer enters a step-up state and regulates the output voltage range between 0 and 20 percent. When the input voltage is further reduced to 165V, the switch K2Conducting to realize the boosting effect of the compensating transformer, and at the moment, the voltage can be boostedThe voltage is boosted by 10%. When the input voltage is further reduced to 154V, the switch K1And conducting, changing the turn ratio of the compensation transformer, and increasing the voltage by 10 percent again. When the output voltage is higher than 235V, the control circuit 1 controls the switches K respectively according to the output voltage2、K1And the compensation transformer is withdrawn. If the output voltage is still higher than 235V, the control loop 1 controls the breaker QF to be disconnected, the contactor KM1 acts, the bypass circuit is conducted at the moment, the input voltage is consistent with the output voltage, and the voltage regulation is realized.
Further, when the voltage regulating system for the low-voltage line provided by the embodiment of the application has a fault, the voltage regulating system automatically supplies power by the bypass circuit 6 and gives out an audible and visual alarm to prompt a worker. When the output end of the voltage regulating system for the low-voltage line is short-circuited, the voltage regulating system automatically cuts off an input power supply, and electricity utilization safety is prevented. Furthermore, the voltage regulating system for the low-voltage line provided by the embodiment of the application can be provided with a remote monitoring system, so that the operation state of the voltage regulating system can be monitored.
In the voltage regulation system for the low-voltage line provided by the embodiment of the application, a boosting transformation device 8 and a compensation transformation device 9 are added on the basis of the original circuit, and the control loop 1 controls the contactor KM1Switch K1Switch K2And the two-gear compensation transformer and the like realize switching voltage regulation, and the output voltage can be improved by 0-40%, so that the voltage regulator has the advantages of large boosting range, good flexibility, high reflection speed, good output waveform and the like compared with the traditional voltage regulator. In addition, the voltage regulating system in the embodiment of the application has the characteristics of simple control and safe and reliable equipment operation, is suitable for places with dispersed low-voltage power grid terminal loads, is particularly suitable for places with longer power supply radius of low-voltage lines of rural power grids, smaller loads of rear-section lines and larger voltage drop, and can solve the problem of ultralow voltage at the tail end of remote rural power grids.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It is to be understood that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The present invention is not limited to the precise arrangements described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.
Claims (4)
1. A voltage regulation system for a low voltage line, comprising: the device comprises a control loop (1), and an input sampling circuit (2), an input circuit (3), an output circuit (4), an output sampling circuit (5), a bypass circuit (6), a through circuit (7), a boosting and transforming device (8) and a compensating and transforming device (9) which are respectively connected with the control loop (1);
the input sampling circuit (2) is respectively connected with the input circuit (3) and the bypass circuit (6);
the output sampling circuit (5) is respectively connected with the output circuit (4) and the bypass circuit (6);
the boosting transformation device (8) is respectively connected with the input circuit (3), the through circuit (7) and the compensation transformation device (9);
the compensation transformer device (9) and the through circuit (7) are respectively connected with the output circuit (4).
2. Voltage regulation system for low-voltage lines according to claim 1, characterized in that the step-up transformer (8) and the step-up transformer (9) are both connected to zero.
3. Voltage regulation system for low-voltage lines according to claim 1, characterized in that the step-up transformation device (8) comprises a step-up transformer and a circuit breaker, one end of the step-up transformer being connected to the input terminal Li through a current transformer and a lightning arrester, the other end being connected to the circuit breaker and the step-up transformation device (9), respectively.
4. Voltage regulation system for low-voltage lines according to claim 1, characterized in that the offset transformation device (9) comprises an offset transformer, a contactor KM1, a switch K1And switch K2One end of the contactor KM1 is connected with the input circuit (3), and the other end is respectively connected with the output end L0Switch K1And switch K2(ii) a The switch K1Is connected with the contactor KM1, and the other end is connected with the compensation transformer X2Shifting; the switch K2Is connected with the contactor KM1, and the other end is connected with the compensation transformer X1And (4) shifting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921598750.8U CN210380259U (en) | 2019-09-25 | 2019-09-25 | Voltage regulating system for low-voltage line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921598750.8U CN210380259U (en) | 2019-09-25 | 2019-09-25 | Voltage regulating system for low-voltage line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210380259U true CN210380259U (en) | 2020-04-21 |
Family
ID=70256056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921598750.8U Active CN210380259U (en) | 2019-09-25 | 2019-09-25 | Voltage regulating system for low-voltage line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210380259U (en) |
-
2019
- 2019-09-25 CN CN201921598750.8U patent/CN210380259U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102638114A (en) | Power supply device of current transformer | |
| CN211089218U (en) | High-capacity high-reliability rapid power supply switching device | |
| CN210380259U (en) | Voltage regulating system for low-voltage line | |
| CN211123742U (en) | Time-sharing power-off control device of power distribution cabinet | |
| CN110535139B (en) | Broad width pressure regulating device | |
| CN208638032U (en) | A kind of 10kVSF6 load ratio bridging switch route series winding automatic pressure regulating device | |
| CN202602381U (en) | Power supply device of current transformer | |
| CN201226418Y (en) | Power supply cabinet | |
| CN101414195B (en) | High voltage stabilizing feedback type electricity-saving device | |
| CN210111610U (en) | Automatic voltage regulating device for three-phase distribution line | |
| CN112367566B (en) | Communication base station high-reliability low-loss alternating current power supply method and device | |
| CN215185833U (en) | A shutting on-load voltage regulation device for main transformer overload | |
| CN2160937Y (en) | Multi-stage compensated ac electric power stabilizer | |
| CN111541375A (en) | Harmonic-free high-power supply device | |
| CN2223504Y (en) | Power-saving domestic full-automatic alternating current voltage regulator | |
| CN210577811U (en) | Voltage grading compensation voltage regulator | |
| CN204906232U (en) | Three -phase asynchronous motor reduced -voltage starting and operation reactive compensation circuit | |
| CN220139248U (en) | Inverter system | |
| CN218071004U (en) | Energy storage transformer slow start major loop circuit | |
| CN210183008U (en) | Main backup protection intelligent selection and hopping middle-section switch system in transformer | |
| CN213461230U (en) | Intelligent flexible power supply switching device | |
| CN211930525U (en) | Water pump one-use one-standby frequency conversion control system | |
| CN111092435A (en) | Adjustable intelligent capacitor | |
| CN2600846Y (en) | Intelligent regulation and control converting station | |
| CN203119483U (en) | Primary adjusting rural power grid low-voltage line end compensator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |