CN216720905U - Dynamic full-compensation arc suppression coil for grounding residual current of power distribution network - Google Patents
Dynamic full-compensation arc suppression coil for grounding residual current of power distribution network Download PDFInfo
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- CN216720905U CN216720905U CN202123025528.9U CN202123025528U CN216720905U CN 216720905 U CN216720905 U CN 216720905U CN 202123025528 U CN202123025528 U CN 202123025528U CN 216720905 U CN216720905 U CN 216720905U
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Abstract
The utility model relates to a dynamic full-compensation arc suppression coil for ground residual current of a power distribution network, which comprises an arc suppression coil circuit and a control unit, wherein the arc suppression coil circuit is connected with the control unit, digital quantity and analog quantity input signal lines in the arc suppression coil circuit are connected with the control unit, analog quantity and digital quantity control lines of the control unit are connected with corresponding signal lines of the arc suppression coil, and arc suppression lines, a current transformer, a voltage transformer, an overvoltage protector and the control unit can be used for quickly and accurately detecting and putting into operation to realize residual current compensation, so that the residual current is limited in a smaller range or even completely eliminated, the ground overvoltage of an electric arc is effectively inhibited, the safe operation of equipment is ensured, the power supply interruption and the economic loss caused by power accidents are reduced, meanwhile, the personal safety of personnel is ensured, and the safety and the reliability of power supply are improved.
Description
Technical Field
The utility model relates to the technical field of power distribution networks, in particular to a dynamic full-compensation arc suppression coil for grounding residual current of a power distribution network.
Background
With the increasing expansion of the capacity of urban and rural power distribution networks and the large use of cable lines, the capacitance current to ground of a ground fault is increased continuously, and the active component in the capacitance current is also improved greatly. The active current component is mainly caused by leakage current of power equipment, active loss in a zero sequence loop, corona loss, active loss of an arc suppression coil and the like. The resonance grounding mode meets the requirements of the operation of the power distribution network on safety and reliability, but the traditional arc suppression coil in the resonance grounding mode can not compensate active components, overcompensated reactive components and harmonic components, so that when a single-phase grounding fault occurs, larger residual current still exists, and even the residual current is out of limit. The arc cannot be extinguished in time due to large residual current and residual current, so that the single-phase earth fault can be further developed into other accidents such as power supply interruption and the like. Meanwhile, the maintenance of the grounding arc can cause overvoltage, further develop accidents, present the trends of expanded range, huge damage and serious loss, and cause immeasurable damage to power systems and users. In addition, the larger grounding residual current can increase the contact voltage and the step voltage of a human body, and great threat is brought to the safety and the life of the human body.
Disclosure of Invention
The utility model provides a dynamic full-compensation arc suppression coil for grounding residual current of a power distribution network, which can quickly and accurately detect and put into operation to realize residual current compensation and limit the grounding residual current in a smaller range or even completely eliminate the grounding residual current, thereby effectively inhibiting the grounding overvoltage of an electric arc, ensuring the safe operation of equipment, reducing the economic loss caused by power interruption and power accidents, simultaneously ensuring the personal safety of personnel and improving the safety and reliability of power supply.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a distribution network ground connection residual current developments full compensation arc suppression coil, includes arc suppression coil circuit and the control unit, and arc suppression coil circuit connection the control unit, digital quantity and analog input signal line access control unit in the arc suppression coil circuit, the analog quantity and the digital quantity control line of control unit connect the arc suppression coil and correspond the signal line.
The arc suppression coil circuit comprises an isolating switch, a grounding transformer, a grounding small resistor, an arc suppression coil, a line intelligent switch, a current transformer, a fuse, a voltage transformer and an overvoltage protection circuit; the upper end of the isolating switch is connected with a three-phase bus of the power distribution network, and the lower end of the isolating switch is respectively connected with a grounding transformer, a line intelligent switch overvoltage protection circuit and a voltage transformer; the windings of the grounding transformer are connected in a Z shape, a neutral point is connected with the upper end of the arc suppression coil, the lower end of the arc suppression coil is connected with a current transformer in series, and the current transformer is grounded; the lower end of the line intelligent switch is connected with the other current transformer and then is grounded; and the three-phase power at the front end of the voltage transformer is respectively connected into the fuse and then is connected with the overvoltage protection circuit in parallel.
The control unit comprises an analog input module, a digital input module, an analog output module, a digital output module, a controller, a communication module and a server, wherein the analog input module, the digital input module, the analog output module and the digital output module of the control unit are respectively connected with analog quantity and digital signal lines and control lines of a current transformer, a voltage transformer and an overvoltage protection circuit in an arc suppression coil circuit, the controller is connected with the communication module, and the communication module is connected with the server through an Ethernet line and an optical fiber.
Compared with the prior art, the utility model has the beneficial effects that:
1) the method can quickly and accurately detect and put into operation, realize the compensation of residual current, and limit the grounding residual current in a smaller range or even completely eliminate the residual current;
2) effectively inhibiting the arc grounding overvoltage and ensuring the safe operation of equipment;
3) the economic loss caused by power supply interruption and power accidents is reduced, the personal safety of personnel is ensured, and the safety and the reliability of power supply are improved.
Drawings
FIG. 1 is a schematic diagram of the present invention.
Fig. 2 is a schematic structural diagram of the control unit according to the present invention.
Fig. 3 is a schematic diagram of the operation of the arc suppression coil of the utility model when the arc suppression coil is not in fault.
Fig. 4 is a schematic diagram of the operation of the arc suppression coil of the utility model during a fault.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
fig. 1 is a schematic structural diagram of the present invention. The utility model discloses a dynamic full-compensation arc suppression coil for grounding residual current of a power distribution network, which comprises an arc suppression coil circuit and a control unit, wherein the arc suppression coil circuit is connected with the control unit, digital quantity and analog quantity input signal lines in the arc suppression coil circuit are connected into the control unit, and analog quantity and digital quantity control lines of the control unit are connected with corresponding signal lines of the arc suppression coil.
The arc suppression coil circuit comprises an isolating switch GQ, a grounding transformer Z, a grounding small resistor R, an arc suppression coil L, a line intelligent switch SQ, a current transformer CT, a fuse RT, a voltage transformer PT and an overvoltage protection circuit GY; the upper end of the isolating switch GQ is connected with a three-phase bus of a power distribution network, and the lower end of the isolating switch GQ is respectively connected with a grounding transformer Z, a line intelligent switch SQ, an overvoltage protection circuit GY and a voltage transformer PT; the windings of the grounding transformer Z are connected in a Z shape to provide a neutral point for the system, the neutral point is connected with the upper end of an arc suppression coil L, the lower end of the arc suppression coil L is connected with a current transformer CT in series, the current transformer CT adopts a capacitor current transformer CT and is grounded; the arc suppression coil L adopts a preset arc suppression coil L, the arc suppression coil L is adjusted to an overcompensation point of about 12% when the system normally operates, and the arc suppression coil L works near a resonance point; the lower end of the intelligent line switch SQ is connected with another current transformer CT and then is grounded; the voltage transformer CT front end three-phase electricity is connected with the overvoltage protection circuit GY in parallel after being connected with the fuse RT respectively, the voltage transformer PT collects three-phase voltage of a power distribution network, and the fuse RT and the overvoltage protection circuit GY form a circuit for restraining arc grounding overvoltage.
When the neutral point is grounded through the arc suppression coil L, the neutral point of the grounding transformer is grounded through the arc suppression coil L in a non-fault state, the current distribution of the arc suppression coil L and the equivalent capacitance C in single-phase grounding does not change greatly, after the current transformer CT is added to the grounding point, the current flows from the fault point to the arc suppression coil L and the current transformer CT through a fault line, the equivalent resistance RL grounding point current of the current transformer, the equivalent resistance grounding point current of the arc suppression coil L and the equivalent capacitance C current in fault single-phase grounding are offset to obtain full compensation, and the fault current basically disappears.
The control unit includes analog input module, digital input module, analog output module, digital output module, controller, communication module and server, the analog input module of control unit, digital input module, analog output module and digital output module connect the analog quantity and the digital signal line and the control line of current transformer CT, voltage transformer PT and overvoltage protection circuit GY in the arc suppression coil circuit respectively, the three-phase voltage that will gather and each line current transfer to the controller in, communication module is connected to the controller, communication module passes through ethernet line and optical fiber connection server, the controller adopts siemens 1500 series.
The following examples are carried out on the premise of the technical scheme of the utility model, and detailed embodiments and specific operation processes are given, but the scope of the utility model is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ examples ] A method for producing a compound
As shown in figure 1, the three-phase electricity of the power distribution network is connected to the upper end of a disconnecting switch GQ, the upper end of a Z-shaped grounding transformer Z is connected to the lower end of the disconnecting switch GQ, a neutral point is connected with an arc suppression coil L in series, the arc suppression coil L is connected with a current transformer CT in series and then connected with a grounding small resistor R in parallel, grounding points are all grounded, the upper end of a line intelligent switch SQ is connected with the lower end of the disconnecting switch GQ and then connected with the current transformer CT in series and grounded, the upper end of a fuse RT is connected with the lower end of the disconnecting switch GQ and then connected with the grounding transformer Z in series, after the series connection, the circuit is connected with an overvoltage protector GY in parallel, the three-phase voltage of the system and the current of each line are connected with an analog quantity input module of a control unit, an overcurrent and overvoltage signal is connected with a digital quantity input module and then connected with a controller, the controller sends control commands to an arc suppression circuit through the analog quantity output module and the digital quantity output module to control module, and finally passes through a communication module, the transmission to the server is made using ethernet lines and optical fibers.
Claims (3)
1. The utility model provides a distribution network ground connection residual current developments full compensation arc suppression coil, its characterized in that includes arc suppression coil circuit and the control unit, and arc suppression coil circuit connection the control unit, digital quantity and analog input signal line access control unit in the arc suppression coil circuit, the analog quantity and the digital quantity control line of control unit connect the arc suppression coil and correspond the signal line.
2. The power distribution network ground residual current dynamic full compensation arc suppression coil according to claim 1, wherein the arc suppression coil circuit comprises an isolation switch, a grounding transformer, a grounding small resistor, an arc suppression coil, a line intelligent switch, a current transformer, a fuse, a voltage transformer and an overvoltage protection circuit; the upper end of the isolating switch is connected with a three-phase bus of the power distribution network, and the lower end of the isolating switch is respectively connected with a grounding transformer, a line intelligent switch overvoltage protection circuit and a voltage transformer; the windings of the grounding transformer are connected in a Z shape, a neutral point is connected with the upper end of the arc suppression coil, the lower end of the arc suppression coil is connected with a current transformer in series, and the current transformer is grounded; the lower end of the line intelligent switch is connected with the other current transformer and then is grounded; and the three-phase power at the front end of the voltage transformer is respectively connected into the fuse and then is connected with the overvoltage protection circuit in parallel.
3. The dynamic full-compensation arc suppression coil for ground residual current of a power distribution network according to claim 1, wherein the control unit comprises an analog input module, a digital input module, an analog output module, a digital output module, a controller, a communication module and a server, the analog input module, the digital input module, the analog output module and the digital output module of the control unit are respectively connected with analog quantity and digital quantity signal lines and control lines of a current transformer, a voltage transformer and an overvoltage protection circuit in an arc suppression coil circuit, and then are connected with the controller, the controller is connected with the communication module, and the communication module is connected with the server through an Ethernet line and an optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123025528.9U CN216720905U (en) | 2021-12-06 | 2021-12-06 | Dynamic full-compensation arc suppression coil for grounding residual current of power distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123025528.9U CN216720905U (en) | 2021-12-06 | 2021-12-06 | Dynamic full-compensation arc suppression coil for grounding residual current of power distribution network |
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| Publication Number | Publication Date |
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| CN216720905U true CN216720905U (en) | 2022-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123025528.9U Active CN216720905U (en) | 2021-12-06 | 2021-12-06 | Dynamic full-compensation arc suppression coil for grounding residual current of power distribution network |
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| Country | Link |
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| CN (1) | CN216720905U (en) |
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2021
- 2021-12-06 CN CN202123025528.9U patent/CN216720905U/en active Active
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