CN215378448U - Damage-free neutral point resistance cabinet - Google Patents
Damage-free neutral point resistance cabinet Download PDFInfo
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- CN215378448U CN215378448U CN202120556115.4U CN202120556115U CN215378448U CN 215378448 U CN215378448 U CN 215378448U CN 202120556115 U CN202120556115 U CN 202120556115U CN 215378448 U CN215378448 U CN 215378448U
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- resistor
- neutral point
- vacuum contactor
- phase vacuum
- current transformer
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Abstract
The utility model discloses a damage-free neutral point resistance cabinet which comprises a resistor, a single-phase vacuum contactor, a current transformer, an infrared temperature measurement sensor and a microcomputer controller, wherein the inlet end of the resistor can be connected with the neutral point of a Z-type connection three-phase grounding transformer or the neutral point of a generator or the neutral point of a main transformer, the outlet end of the resistor is connected with the inlet end of the single-phase vacuum contactor, the outlet end of the single-phase vacuum contactor is connected with the inlet end of the current transformer, and the outlet end of the current transformer is connected with the ground. The microcomputer controller of the neutral point resistance cabinet monitors the current and the temperature of the resistor in real time, and the problem that the existing zero sequence protection device is out of action or the switch fails to operate is solved, and the occurrence of long-time through-flow burning accidents of the neutral point resistance cabinet is avoided.
Description
The technical field is as follows:
the utility model relates to the technical field of power system grounding, in particular to a novel automatic control damage-free neutral point resistance cabinet.
Background art:
the neutral point resistance cabinet is an electrical device connected with a neutral point of a Z-connection three-phase grounding transformer, a neutral point of a generator or a neutral point of a main transformer, the neutral point can effectively limit clearance arc grounding overvoltage, reduce system operation overvoltage, eliminate system resonance overvoltage, facilitate configuration of unidirectional grounding fault protection, and effectively cut off a fault circuit in a short time through a resistance grounding system, so that the insulation level of system equipment is reduced, the service life of the system equipment is prolonged, and the safety and reliability of system operation are improved, thereby being widely applied.
The neutral point resistance cabinet is provided with resistors made of nickel-chromium alloy, iron-chromium-aluminum, stainless steel alloy and the like, the power industry standard DL/T780-2001 specifies the rated through-flow time 10S of the stainless steel resistor, the temperature rise is no more than 780K, the neutral point resistance cabinet grounding system belongs to a short-time working system, the neutral point resistance cabinet grounding system is provided with zero-sequence grounding protection, when the system is subjected to single-phase grounding, the setting tripping time of a zero-sequence grounding protection device is generally no more than 3S, so that the system is protected, and the resistor is prevented from being burnt due to overhigh temperature.
In practical application, the resistor burning accident often occurs in the neutral point resistor cabinet, and the reason is as follows: the fault line can not be cut off in time due to the failure of the zero sequence protection device, the secondary wiring error or the switch failure, so that the resistor is burnt out due to overhigh temperature when exceeding the running time of the resistor.
The utility model has the following contents:
the utility model aims to solve the problem that the existing zero sequence protection device is out of action or the switch fails to operate, so that the neutral point resistance cabinet is prevented from being burnt for a long time, and the damage-free neutral point resistance cabinet is provided.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a damage-free neutral point resistance cabinet, includes resistor, single-phase vacuum contactor, current transformer, infrared temperature sensor, microcomputer control ware, the resistor inlet wire end can be connected with Z type connection three-phase grounding transformer neutral point or generator neutral point or main transformer neutral point, the resistor leading-out terminal is connected with single-phase vacuum contactor inlet wire end, single-phase vacuum contactor leading-out terminal is connected with current transformer inlet wire end, the current transformer leading-out terminal is connected with the ground, single-phase vacuum contactor combined floodgate coil is connected with microcomputer control ware, the current transformer secondary line is connected with microcomputer control ware, infrared temperature sensor is connected with microcomputer control ware.
Further, the single-phase vacuum contactor is installed between the resistor and the current transformer, the single-phase vacuum contactor is in a closing state when the equipment normally operates, and the single-phase vacuum contactor is in an opening state when the temperature and the current of the resistor exceed set values.
Further, the microcomputer controller monitors current and temperature signals of the current transformer and the infrared temperature measuring sensor, and when the temperature and the current of the resistor exceed set values, an instruction is sent to enable the single-phase vacuum contactor to be opened.
The damage-free neutral point resistance cabinet provided by the utility model has the following beneficial effects: when the system normally operates, the single-phase vacuum contactor is in a closing state, and the resistor is connected with the ground. When the system is in single-phase grounding, the neutral point generates displacement voltage and is added to two ends of the resistor, and the resistor enters a working state to limit single-phase grounding overvoltage and provide resistive current for tripping the zero-sequence protection device. When the zero sequence protection device and the tripping circuit thereof have problems, the grounding fault line cannot be cut off in time, and the resistor current and the temperature thereof monitored by the microcomputer controller of the neutral point resistance cabinet exceed set values, the microcomputer controller sends a tripping command to break the single-phase vacuum contactor, so that the resistor is withdrawn from operation, and the resistor is prevented from being burnt due to long-time through current.
Description of the drawings:
the following detailed description of embodiments of the utility model is provided in conjunction with the appended drawings:
fig. 1 is a schematic structural diagram of a damage-free neutral point resistor cabinet provided in the present invention;
fig. 2 is a schematic structural diagram of the interior of the damaged neutral point resistor cabinet of the present invention.
The reference numbers in the figures illustrate: 1-a resistor incoming line end, 2-a resistor, 3-a single-phase vacuum contactor, 4-a current transformer, 5-an infrared temperature measurement sensor and 6-a microcomputer controller.
The specific implementation mode is as follows:
it should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the position of all the mounting components in the embodiments of the present invention is only illustrated for explaining the relative position relationship between the components in a specific posture (as shown in the drawings), and if the specific position is changed, the connection of the components is changed accordingly.
As shown in fig. 1, a damage-free neutral point resistance cabinet comprises a resistor incoming line end 1, wherein the resistor incoming line end 1 can be connected with a neutral point of a Z-connection three-phase grounding transformer or a neutral point of a generator or a main transformer, an outgoing line end of a resistor 2 is connected with an incoming line end of a single-phase vacuum contactor 3, an outgoing line end of the single-phase vacuum contactor 3 is connected with an incoming line end of a current transformer 4, an outgoing line end of the current transformer 4 is connected with the ground, a closing coil of the single-phase vacuum contactor 3 is connected with a microcomputer controller 6, a secondary line of the current transformer 4 is connected with the microcomputer controller 6, and an infrared temperature measuring sensor 5 is connected with the microcomputer controller 6.
Specifically, the single-phase vacuum contactor 3 is in a closing on state when normally operating.
Specifically, the microcomputer controller 6 collects a secondary current signal of the current transformer 4.
Specifically, the microcomputer controller 6 collects a temperature signal of the infrared temperature measurement sensor 5.
By adopting the technical scheme, when the intelligent protection device is used, the microcomputer controller 6 sends a tripping command to break the single-phase vacuum contactor 3 through the secondary current signal of the current transformer 4 and the temperature signal of the infrared temperature measurement sensor 5 which are monitored in real time, when the current signal and the temperature signal exceed set values, so that the resistor is withdrawn from operation, and the resistor is prevented from being burnt due to long-time through flow.
The foregoing shows and describes the general principles, essential features, and inventive features of this invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is to be protected by the following claims and their equivalents.
Claims (3)
1. A damage-free neutral point resistance cabinet comprises a resistor incoming line end (1), a resistor (2), a single-phase vacuum contactor (3), a current transformer (4), an infrared temperature measurement sensor (5) and a microcomputer controller (6); the three-phase grounding resistor is characterized in that a resistor wire inlet end (1) can be connected with a neutral point of a Z-type connection three-phase grounding transformer or a neutral point of a generator or a main transformer, a wire outlet end of a resistor (2) is connected with a wire inlet end of a single-phase vacuum contactor (3), a wire outlet end of the single-phase vacuum contactor (3) is connected with a wire inlet end of a current transformer (4), a wire outlet end of the current transformer (4) is connected with the ground, a closing coil of the single-phase vacuum contactor (3) is connected with a microcomputer controller (6), a secondary wire of the current transformer (4) is connected with the microcomputer controller (6), and an infrared temperature measuring sensor (5) is connected with the microcomputer controller (6).
2. The damage-free neutral point resistor cabinet as recited in claim 1, wherein: the single-phase vacuum contactor (3) is arranged between the resistor (2) and the current transformer (4), the single-phase vacuum contactor (3) is in a closing state when equipment normally operates, and the single-phase vacuum contactor (3) is in an opening state when the temperature and the current of the resistor exceed set values.
3. The damage-free neutral point resistor cabinet as recited in claim 1, wherein: the microcomputer controller monitors the current and temperature signals of the current transformer (4) and the infrared temperature measuring sensor (5), and when the temperature and the current of the resistor exceed set values, an instruction is sent out to enable the single-phase vacuum contactor (3) to be opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120556115.4U CN215378448U (en) | 2021-03-18 | 2021-03-18 | Damage-free neutral point resistance cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120556115.4U CN215378448U (en) | 2021-03-18 | 2021-03-18 | Damage-free neutral point resistance cabinet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215378448U true CN215378448U (en) | 2021-12-31 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120556115.4U Active CN215378448U (en) | 2021-03-18 | 2021-03-18 | Damage-free neutral point resistance cabinet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215378448U (en) |
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2021
- 2021-03-18 CN CN202120556115.4U patent/CN215378448U/en active Active
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