CN215817530U - Power supply arc extinguishing circuit - Google Patents
Power supply arc extinguishing circuit Download PDFInfo
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- CN215817530U CN215817530U CN202121275805.9U CN202121275805U CN215817530U CN 215817530 U CN215817530 U CN 215817530U CN 202121275805 U CN202121275805 U CN 202121275805U CN 215817530 U CN215817530 U CN 215817530U
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Abstract
The utility model provides a power supply arc suppression circuit, which belongs to the field of circuit arc suppression and comprises a controller XD, a branch grounding fast switch JZ, a fault management and control system controller ZK, a voltage monitoring controller YK and an anti-saturation voltage protection circuit; one end of the branching grounding fast switch JZ is connected with a main power supply, the other end of the branching grounding fast switch JZ is connected with the input end of the controller XD through the current transformer LH, and the contact end of the branching grounding fast switch JZ is connected with the signal output end of the fault management and control system controller ZK; one end of the voltage protection circuit is connected with a main power supply, and the other end of the voltage protection circuit is connected with signal input ends of the controller XD, the fault management and control system controller ZK and the voltage monitoring controller YK. The circuit solves the problem that the compensation effect of the single-phase grounding electric arc of the power system is not ideal, and eliminates the grounding electric arc.
Description
Technical Field
The utility model belongs to the field of circuit arc extinction, and particularly relates to a power supply arc extinction circuit.
Background
The existing large-scale power supply system is a neutral point ungrounded system, and can continue to operate for 1-2 hours after a single-phase ground fault occurs according to the regulation of a safe operation rule of a power system, but the non-fault phase-to-ground voltage of the system is increased to be line voltage, and if the non-fault phase-to-ground voltage is not timely processed, a two-phase short circuit is easily developed to enlarge the fault. Especially, when the system supplies power to a single-core cable, huge energy is usually released when the single-phase arc light of the cable is grounded, the insulation of the peripheral cable is damaged, and the system is developed into an inter-phase short circuit in a very short time to cause a system vehicle jumping accident, so that the stable operation of production equipment facilities is seriously influenced. Therefore, the circuit must be arc-extinguished.
The prior art has a single governing means for single-phase arc grounding, adopts an arc suppression coil to compensate grounding arc current, and practices prove that the single-phase arc grounding fault can not be effectively governed only by the compensation of the arc suppression coil, and finally still can be further developed into a short-circuit accident.
The present application thus proposes a power supply arc suppression circuit.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides a power supply arc suppression circuit.
In order to achieve the above purpose, the utility model provides the following technical scheme:
a power supply arc suppression circuit comprises a controller XD, a branch grounding fast switch JZ, a fault management and control system controller ZK, a voltage monitoring controller YK and an anti-saturation voltage protection circuit;
one end of the branching grounding fast switch JZ is connected with a main power supply, the other end of the branching grounding fast switch JZ is connected with the input end of the controller XD through the current transformer LH, and the contact end of the branching grounding fast switch JZ is connected with the signal output end of the fault management and control system controller ZK;
one end of the voltage protection circuit is connected with a main power supply, and the other end of the voltage protection circuit is connected with signal input ends of the controller XD, the fault management and control system controller ZK and the voltage monitoring controller YK.
Preferably, the voltage protection circuit includes a high-voltage fuse RD and an anti-saturation voltage transformer YH connected in series, an output terminal of the anti-saturation voltage transformer YH is connected to signal input terminals of the controller XD, the fault management and control system controller ZK and the voltage monitoring controller YK, and the high-voltage fuse RD is connected to a main power supply.
Preferably, the high-voltage fuse RD is connected to the mains supply via a disconnector GN.
Preferably, the high-capacity energy absorber LEP and the indicator light are connected in parallel to both sides of the high-voltage fuse RD.
Preferably, a current-limiting type strong damping suppressor DR is connected in parallel to one side of the anti-saturation voltage transformer YH.
Preferably, the branching and grounding fast switch JZ includes three groups of control switch branches connected in parallel, one end of each of the three groups of control switch branches is connected to a main power supply, the other end of each of the three groups of control switch branches is connected to an input end of the controller XD through the current transformer LH, and contact ends of the three groups of control switch branches are connected to a signal output end of the fault management and control system controller ZK.
The power supply arc suppression circuit provided by the utility model has the following beneficial effects:
(1) the circuit can accurately select a fault line, when single-phase arc light grounding occurs, the fault phase grounding switch is actively connected with the fault phase, a metallic direct grounding point is actively manufactured, arc light grounding is converted into direct grounding, the grounding electric arc of the fault point is effectively treated, the arc light treatment effect of the fault point is achieved, and the expansion of accidents is reduced and prevented.
(2) The problem that the compensation effect of the single-phase grounding electric arc is not ideal is solved, and the grounding electric arc is eliminated.
(3) The grounding electric arc can be eliminated quickly, and the duration time of the single-phase grounding electric arc is greatly shortened; the direct grounding is actively intervened, and the electric arc of the fault grounding point can be well eliminated.
Drawings
In order to more clearly illustrate the embodiments of the present invention and the design thereof, the drawings required for the embodiments will be briefly described below. The drawings in the following description are only some embodiments of the utility model and it will be clear to a person skilled in the art that other drawings can be derived from them without inventive effort.
Fig. 1 is a circuit diagram of a power supply arc-extinguishing circuit of embodiment 1 of the present invention;
fig. 2 is a circuit diagram showing an example of installation of a power supply arc-extinguishing circuit provided in embodiment 1 of the present invention.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention and can practice the same, the present invention will be described in detail with reference to the accompanying drawings and specific examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
The utility model provides a power supply arc suppression circuit, which is particularly shown in figure 1 and comprises a controller XD, a branch grounding fast switch JZ, a fault management and control system controller ZK, a voltage monitoring controller YK and an anti-saturation voltage protection circuit, wherein the fault management and control system controller ZK is connected with the controller XD; the voltage protection circuit is mainly used for supplying power to a control element in a system when a line has a fault, so that the control element can normally operate to detect the fault.
One end of a branching grounding fast switch JZ is connected with a main power supply, the other end of the branching grounding fast switch JZ is connected with the input end of a controller XD through a current transformer LH, and the contact end of the branching grounding fast switch JZ is connected with the signal output end of a fault management and control system controller ZK;
one end of the voltage protection circuit is connected with the main power supply, and the other end of the voltage protection circuit is connected with signal input ends of the controller XD, the fault management and control system controller ZK and the voltage monitoring controller YK.
Specifically, in this embodiment, the voltage protection circuit includes a high-voltage fuse RD and an anti-saturation voltage transformer YH connected in series, an output terminal of the anti-saturation voltage transformer YH is connected to signal input terminals of the controller XD, the fault management and control system controller ZK, and the voltage monitoring controller YK, and the high-voltage fuse RD is connected to the main power supply.
For convenience of control, in this embodiment, the high-voltage fuse RD is connected to the main power supply through the disconnecting switch GN.
Meanwhile, the high-energy capacity energy absorber LEP and the indicating lamp are connected in parallel on two sides of the high-voltage fuse RD, the high-energy capacity energy absorber LEP has the purposes of storing electric energy and reducing the overvoltage amplitude, and the setting of the indicating lamp is convenient to observe the state of the circuit.
Specifically, in this embodiment, a current-limiting strong damping suppressor DR is connected in parallel to one side of the anti-saturation voltage transformer YH for eliminating ferromagnetic resonance generated by the anti-saturation voltage transformer YH, limiting an abrupt increase of an exciting current of a primary winding of the voltage transformer, and preventing an accident of fusing a high-voltage fuse or burning the voltage transformer due to a severe overload of the anti-saturation voltage transformer YH.
Specifically, in this embodiment, the branch-grounding fast switch JZ includes three groups of control switch branches connected in parallel, one end of each of the three groups of control switch branches is connected to the main power supply, the other end of each of the three groups of control switch branches is connected to the input end of the controller XD through the current transformer LH, and the contact ends of the three groups of control switch branches are connected to the signal output end of the fault management and control system controller ZK.
In use, the power supply arc suppression circuit provided by the present embodiment may be connected to a desired power system, and one signal output terminal of the controller XD may be connected to a bus of the power system. As shown in fig. 2, a current grounding line selection circuit is modified and installed in a company in combination with a distribution network comprehensive fault management and control system in 35kV, and a voltage value and an open voltage value of the current grounding line selection circuit and a zero sequence current on each feeder line loop are acquired in real time. When the voltage of the system is out of limit (for example, 130% higher than the rated voltage or 70% lower than the rated voltage), the system immediately sends out an alarm signal and outputs a switching value contact, and the fault time, the type and the voltage of each phase can be recorded. By utilizing the characteristics of the power supply arc suppression circuit and the high-voltage fast switch provided by the embodiment, when a single-phase ground fault occurs in a system, the controller controls the fault phase grounding switch to be switched on within 20mS, directly grounds the fault phase, extinguishes the grounding arc, limits the arc grounding voltage to the online voltage level, and controls the development of the fault.
The above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and any simple modifications or equivalent substitutions of the technical solutions that can be obviously obtained by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (6)
1. A power supply arc suppression circuit is characterized by comprising a controller XD, a branch grounding fast switch JZ, a fault management and control system controller ZK, a voltage monitoring controller YK and an anti-saturation voltage protection circuit;
one end of the branching grounding fast switch JZ is connected with a main power supply, the other end of the branching grounding fast switch JZ is connected with the input end of the controller XD through a current transformer LH, and the contact end of the branching grounding fast switch JZ is connected with the signal output end of the fault management and control system controller ZK;
one end of the voltage protection circuit is connected with a main power supply, and the other end of the voltage protection circuit is connected with signal input ends of the controller XD, the fault management and control system controller ZK and the voltage monitoring controller YK.
2. A power supply arc suppression circuit according to claim 1, wherein said voltage protection circuit comprises a high voltage fuse RD and an anti-saturation voltage transformer YH connected in series, an output terminal of said anti-saturation voltage transformer YH is connected to signal input terminals of said controller XD, fault management system controller ZK and voltage monitoring controller YK, and said high voltage fuse RD is connected to a main power supply.
3. A power supply crowbar circuit as claimed in claim 2, characterized in that the high-voltage fuse RD is connected to the mains supply via an isolating switch GN.
4. A power supply arc suppression circuit as claimed in claim 2, wherein a high-capacity energy absorber LEP and an indicator lamp are connected in parallel to both sides of the high-voltage fuse RD.
5. A power supply arc suppression circuit according to claim 2, characterized in that a current-limiting type strong damping suppressor DR is connected in parallel to one side of the anti-saturation voltage transformer YH.
6. A power supply arc suppression circuit according to claim 1, wherein the branch-to-ground fast switch JZ comprises three sets of control switch branches connected in parallel, one end of each of the three sets of control switch branches is connected to a main power supply, the other end of each of the three sets of control switch branches is connected to an input terminal of the controller XD through the current transformer LH, and contact terminals of the three sets of control switch branches are connected to a signal output terminal of the fault management and control system controller ZK.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121275805.9U CN215817530U (en) | 2021-06-08 | 2021-06-08 | Power supply arc extinguishing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121275805.9U CN215817530U (en) | 2021-06-08 | 2021-06-08 | Power supply arc extinguishing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215817530U true CN215817530U (en) | 2022-02-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121275805.9U Active CN215817530U (en) | 2021-06-08 | 2021-06-08 | Power supply arc extinguishing circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215817530U (en) |
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2021
- 2021-06-08 CN CN202121275805.9U patent/CN215817530U/en active Active
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