CN104753031A - Neutral point complete-set protection device - Google Patents
Neutral point complete-set protection device Download PDFInfo
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- CN104753031A CN104753031A CN201510200241.5A CN201510200241A CN104753031A CN 104753031 A CN104753031 A CN 104753031A CN 201510200241 A CN201510200241 A CN 201510200241A CN 104753031 A CN104753031 A CN 104753031A
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- current transformer
- lightning arrester
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- 230000007935 neutral effect Effects 0.000 title claims abstract description 30
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical group [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
- 239000011787 zinc oxide Substances 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims 5
- 238000007599 discharging Methods 0.000 claims 4
- 238000000034 method Methods 0.000 abstract description 5
- 238000009413 insulation Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
本发明公开了一种中性点成套保护装置，包括保护装置本体和变压器中性点电流互感器，电流互感器和放电间隙串联连接，电流互感器和放电间隙与避雷器和计数装置相并联连接，电流互感器、放电间隙、避雷器和计数装置串联连接有一隔离开关，隔离开关串联连接有变压器中性点电流互感器，变压器中性点电流互感器输入端连接于变压器高压侧，输出端连接于变压器低压侧。该中性点成套保护装置，通过设置有避雷器，避雷器用于承担雷电过电压保护的作用，放电间隙与避雷器两者间形成并联回路，使得两者的分工明确，本发明能够节省占地面积，且组装方式灵活，运行安全可靠，设计合理。
The invention discloses a neutral point complete protection device, which comprises a protection device body and a transformer neutral point current transformer, the current transformer and a discharge gap are connected in series, and the current transformer and the discharge gap are connected in parallel with a lightning arrester and a counting device. The current transformer, discharge gap, lightning arrester and counting device are connected in series with an isolating switch, and the isolating switch is connected in series with a transformer neutral point current transformer. The input end of the transformer neutral point current transformer is connected to the high voltage side of the transformer, and the output end is connected to the transformer. low pressure side. The neutral point complete protection device is provided with a lightning arrester, which is used for lightning overvoltage protection, and a parallel circuit is formed between the discharge gap and the lightning arrester, so that the division of labor between the two is clear, and the invention can save floor space. And the assembly method is flexible, the operation is safe and reliable, and the design is reasonable.
Description
技术领域 technical field
本发明涉及保护装置技术领域，具体为一种中性点成套保护装置。 The invention relates to the technical field of protection devices, in particular to a complete set of protection devices for neutral points.
背景技术 Background technique
中性点成套保护装置广泛用于变压器上，而且是高压输变电设备中的主要设备之一，主要用于对变压器中性点出现雷电过电压、操作过电压和暂时过电压时起保护作用。所以在电力系统中占有重要的地位。由于使用量大，对工作可靠性要求比较高，对变电所，电厂的设计、建立和安全运行的影响均较大。目前，在高压开关设备领域 , 国内主要专注于智能能型断路器和 GIS 设备的研制和运用 , 而对变压器中性点成套保护装置领域 , 则仍然采用传统产品结构，在这传统产品结构的运行方式下，由于雷击、单相接地短路故障等会造成中性点过电压，而且变压器大多是分级绝缘，因此过电压对中性点的绝缘造成很大威胁，须对其设置保护装置防止事故发生。 The complete set of neutral point protection devices is widely used in transformers, and is one of the main equipment in high-voltage power transmission and transformation equipment. It is mainly used to protect the neutral point of transformers from lightning overvoltage, operating overvoltage and temporary overvoltage. . Therefore, it occupies an important position in the power system. Due to the large amount of use, the requirements for work reliability are relatively high, which has a great impact on the design, establishment and safe operation of substations and power plants. At present, in the field of high-voltage switchgear, China mainly focuses on the development and application of intelligent energy-based circuit breakers and GIS equipment, while in the field of transformer neutral point complete protection devices, the traditional product structure is still adopted. The operation of this traditional product structure In this mode, lightning strikes, single-phase grounding short-circuit faults, etc. will cause overvoltage at the neutral point, and most of the transformers are graded insulation, so the overvoltage poses a great threat to the insulation of the neutral point, and protection devices must be installed to prevent accidents. .
发明内容 Contents of the invention
本发明的目的在于提供一种中性点成套保护装置，以解决上述背景技术中提出的问题。 The purpose of the present invention is to provide a complete neutral point protection device to solve the problems raised in the above-mentioned background technology.
为实现上述目的，本发明提供如下技术方案：一种中性点成套保护装置，包括保护装置本体和变压器中性点电流互感器，所述保护装置本体包括电流互感器、放电间隙、避雷器、计数装置和隔离开关，所述电流互感器和放电间隙串联连接，所述电流互感器和放电间隙与避雷器和计数装置相并联连接，所述电流互感器、放电间隙、避雷器和计数装置串联连接有一隔离开关，所述隔离开关串联连接有变压器中性点电流互感器，所述变压器中性点电流互感器输入端连接于变压器高压侧，输出端连接于变压器低压侧。 In order to achieve the above object, the present invention provides the following technical solutions: a complete set of neutral point protection device, including a protection device body and a transformer neutral point current transformer, the protection device body includes a current transformer, a discharge gap, a lightning arrester, a counting device and an isolating switch, the current transformer and the discharge gap are connected in series, the current transformer and the discharge gap are connected in parallel with the lightning arrester and the counting device, and the current transformer, the discharge gap, the lightning arrester and the counting device are connected in series with an isolation A switch, the isolating switch is connected in series with a transformer neutral point current transformer, the input end of the transformer neutral point current transformer is connected to the high voltage side of the transformer, and the output end is connected to the low voltage side of the transformer.
优选的，所述避雷器为氧化锌避雷器。 Preferably, the arrester is a zinc oxide arrester.
优选的，所述隔离开关为V型双柱回转式结构。 Preferably, the isolating switch is a V-shaped double-column rotary structure.
与现有技术相比，本发明的有益效果是：该中性点成套保护装置，通过设置有避雷器，避雷器用于承担雷电过电压保护的作用，放电间隙与避雷器两者间形成并联回路，使得两者的分工明确，通过将电子电流互感器与放电间隙串联连接，用于负责记录泄露电流，本发明采用组合的方式，能够节省占地面积，且组装方式灵活，运行安全可靠，设计合理。 Compared with the prior art, the beneficial effect of the present invention is that: the neutral point complete protection device is provided with a lightning arrester, and the lightning arrester is used for lightning overvoltage protection, and a parallel circuit is formed between the discharge gap and the lightning arrester, so that The division of labor between the two is clear, and the electronic current transformer is connected in series with the discharge gap to be responsible for recording the leakage current. The present invention adopts a combined method, which can save floor space, and has flexible assembly methods, safe and reliable operation, and reasonable design.
附图说明 Description of drawings
图1为本发明结构电路图。 Fig. 1 is a structural circuit diagram of the present invention.
图中：1保护装置本体、11电流互感器、12放电间隙、13避雷器、14计数装置、15隔离开关、2变压器中性点电流互感器、a变压器高压侧、b变压器低压侧。 In the figure: 1 protection device body, 11 current transformer, 12 discharge gap, 13 lightning arrester, 14 counting device, 15 isolating switch, 2 transformer neutral point current transformer, a transformer high voltage side, b transformer low voltage side.
具体实施方式 Detailed ways
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。 The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
请参阅图1，本发明提供一种技术方案：一种中性点成套保护装置，包括保护装置本体1和变压器中性点电流互感器2，所述保护装置本体1包括电流互感器11、放电间隙12、避雷器13、计数装置14和隔离开关15，所述电流互感器11和放电间隙12串联连接，所述电流互感器11和放电间隙12与避雷器13和计数装置14相并联连接，所述避雷器13为氧化锌避雷器，所述电流互感器11、放电间隙12、避雷器13和计数装置14串联连接有一隔离开关15，所述隔离开关15为V型双柱回转式结构，所述隔离开关15串联连接有变压器中性点电流互感器2，所述变压器中性点电流互感器2输入端连接于变压器高压侧a，输出端连接于变压器低压侧b。 Please refer to Fig. 1, the present invention provides a technical solution: a complete neutral point protection device, including a protection device body 1 and a transformer neutral point current transformer 2, and the protection device body 1 includes a current transformer 11, a discharge Gap 12, arrester 13, counting device 14 and isolating switch 15, described current transformer 11 and discharge gap 12 are connected in series, and described current transformer 11 and discharge gap 12 are connected in parallel with arrester 13 and counting device 14, described The lightning arrester 13 is a zinc oxide lightning arrester. The current transformer 11, the discharge gap 12, the lightning arrester 13 and the counting device 14 are connected in series with a disconnector 15. The disconnector 15 is a V-shaped double-column rotary structure. The disconnector 15 A transformer neutral point current transformer 2 is connected in series, the input end of the transformer neutral point current transformer 2 is connected to the high voltage side a of the transformer, and the output end is connected to the low voltage side b of the transformer.
工作原理：放电间隙12与避雷器13两者间形成并联回路、组合间隙，避雷器13承担雷电过电压保护，当系统发生单相接地故障及开关单相重合闸过程中，放电间隙12不应放电动作，只有当系统失地，且出现系统非全相运行或谐振故障时，放电间隙12可靠动作，保护变压器中性点绝缘及线端设备的绝缘，防止避雷器13因通流容量不够发生爆炸损坏主变压器及附近设备，电子电流互感器11与放电间隙12串联连接，负责记录泄露电流，避雷器13监测器采用一次电流穿心方式，通过并联连接有计数装置14记录避雷器13雷击次数，也可在线监测避雷器13泄漏电流，本实用结构简单，设计合理。 Working principle: The discharge gap 12 and the lightning arrester 13 form a parallel circuit and combined gap, and the lightning arrester 13 is responsible for lightning overvoltage protection. When the system has a single-phase ground fault and the single-phase reclosing process of the switch, the discharge gap 12 should not discharge , only when the system loses ground, and the system is not in full-phase operation or resonance fault occurs, the discharge gap 12 will act reliably to protect the insulation of the neutral point of the transformer and the insulation of the line-end equipment, and prevent the main transformer from being damaged by the explosion of the arrester 13 due to insufficient current capacity. And nearby equipment, the electronic current transformer 11 is connected in series with the discharge gap 12, and is responsible for recording the leakage current. The monitor of the arrester 13 adopts the primary current through-the-heart mode, and the counting device 14 is connected in parallel to record the number of lightning strikes of the arrester 13, and the arrester can also be monitored online. 13 leakage current, the utility model has simple structure and reasonable design.
尽管已经示出和描述了本发明的实施例，对于本领域的普通技术人员而言，可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型，本发明的范围由所附权利要求及其等同物限定。 Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510200241.5A CN104753031A (en) | 2015-04-26 | 2015-04-26 | Neutral point complete-set protection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510200241.5A CN104753031A (en) | 2015-04-26 | 2015-04-26 | Neutral point complete-set protection device |
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| CN104753031A true CN104753031A (en) | 2015-07-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105140903A (en) * | 2015-09-21 | 2015-12-09 | 中电新源智能电网科技有限公司 | Transformer neutral point gas insulated substation |
| CN109004531A (en) * | 2018-07-27 | 2018-12-14 | 国网江苏省电力有限公司苏州供电分公司 | A kind of neutral resistance complexes |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06276669A (en) * | 1993-03-18 | 1994-09-30 | Nissin Electric Co Ltd | Neutral-point grounding apparatus |
| CN202153638U (en) * | 2011-07-20 | 2012-02-29 | 苏州苏高智能电气有限公司 | Complete set of protective apparatus for transformer neutral point |
| CN103532124A (en) * | 2013-07-02 | 2014-01-22 | 辽宁电力勘测设计院 | Main transformer neutral point CT arrangement system |
-
2015
- 2015-04-26 CN CN201510200241.5A patent/CN104753031A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06276669A (en) * | 1993-03-18 | 1994-09-30 | Nissin Electric Co Ltd | Neutral-point grounding apparatus |
| CN202153638U (en) * | 2011-07-20 | 2012-02-29 | 苏州苏高智能电气有限公司 | Complete set of protective apparatus for transformer neutral point |
| CN103532124A (en) * | 2013-07-02 | 2014-01-22 | 辽宁电力勘测设计院 | Main transformer neutral point CT arrangement system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105140903A (en) * | 2015-09-21 | 2015-12-09 | 中电新源智能电网科技有限公司 | Transformer neutral point gas insulated substation |
| CN109004531A (en) * | 2018-07-27 | 2018-12-14 | 国网江苏省电力有限公司苏州供电分公司 | A kind of neutral resistance complexes |
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