CN203747262U - Neutral-point ground resistor cabinet of transformer - Google Patents
Neutral-point ground resistor cabinet of transformer Download PDFInfo
- Publication number
- CN203747262U CN203747262U CN201420071063.1U CN201420071063U CN203747262U CN 203747262 U CN203747262 U CN 203747262U CN 201420071063 U CN201420071063 U CN 201420071063U CN 203747262 U CN203747262 U CN 203747262U
- Authority
- CN
- China
- Prior art keywords
- cabinet
- resistance
- transformer
- resistor
- neutral point
- 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.)
- Expired - Fee Related
Links
Abstract
The utility model provides a neutral-point ground resistor cabinet of a transformer. The resistor cabinet comprises a cabinet body including a resistor cabinet unit and a ground transformer cabinet, wherein the resistor cabinet unit and the ground transformer cabinet are arranged in parallel. Grounding resistors are arranged in the resistor cabinet unit; and a grounding transformer is arranged inside the ground transformer cabinet. The grounding resistors include a plurality of grating resistors that are stacked in an upper-lower mode; insulators are arranged between the adjacent grating resistors; and the plurality of grating resistors form a resistor network based on combination of series connection and parallel connection. According to the scheme, the neutral-point ground resistor cabinet has the reasonable heat radiation structure; and the resistor cabinet unit and the ground transformer cabinet are arranged in parallel and the resistor elements employ the grating structure, so that the optimum cooling air flow channel is realized and occurrences of the local high temperature point and the easy firing point can be avoided. Moreover, the grounding resistors are modularized and can be combined randomly by series connection and parallel connection, thereby satisfying demands of different currents, voltages, and resistances.
Description
Technical field
The utility model relates to a kind of power system device, specifically a kind of transformer neutral point earthing resistance cabinet.
Background technology
Along with the power network development in city, electric network composition has had great changes, and the proportion of cable line rises year by year, has occurred that capacitive earth current increases severely (direct-to-ground capacitance of many urban power distribution networks has exceeded 200A) taking cable as main power distribution network.Totally-enclosed GIS electrical equipment and zinc oxide arrester are widely used simultaneously, and this class import equipment also increases gradually.In the case, adopt isolated neutral or through grounding through arc mode, in the time there is single phase ground fault, can produce very high overvoltage, various resonance overvoltages, its insulation can not recover voluntarily, and disengagement failure not in time easily makes fault expand.Apparatus insulated and safe operation zinc oxide arrester are caused to serious threat, threaten larger to the insulation of a large amount of import equipments in each electrical network.And Neutral Grounding through Resistance in Electrical mode can be excised fast fault in the time of single phase ground fault, overvoltage level low (2.5 times), resonance overvoltage can not develop, and electrical network can adopt the electric equipment that insulation level is lower; Healthy phases voltage raises less, and the probability that occurs as phase fault is lower; In addition, also improve electric equipment service conditions, improved electrical network and equipment reliability of operation.Neutral Grounding through Resistance in Electrical mode is progressively promoted in China's urban distribution network at present; facts have proved fail safe, the reliability of this Techniques For Reducing power network overvoltage, raising electrical network; have good effect, this earthing mode has been written into People's Republic of China's power industry standard (DL/T620-1997 " overvoltage protection of alternating-current electric device and insulation coordination " 3.1.4,3.1.5 article.
The resistance of resistance can be subject to the impact of temperature, therefore for the temperature control of the earthing resistance cabinet outbalance that just seems itself, need on radiating mode, carry out certain design, not only avoid the impact of temperature on resistance, also avoid localized hyperthermia or the easily appearance of calcination point.In addition, for different electric currents, voltage condition, need to adjust the resistance of earth resistance, the resistance adjustment mode that reasonably designs earth resistance also becomes the factor that needs are considered.
Utility model content
The utility model proposes a kind of transformer neutral point earthing resistance cabinet, simple in structure, easy to use, solve well the problem of the aspect such as heat radiation and resistance adjustment mode.
The technical solution of the utility model is achieved in that
A kind of transformer neutral point earthing resistance cabinet, comprise cabinet, described cabinet comprises the resistor box and the grounding transformer cabinet that are set up in parallel, in described resistor box, be provided with earth resistance, in described grounding transformer cabinet, be provided with grounding transformer, described earth resistance comprises several grid resistance stacking up and down, between adjacent grid resistance, is provided with insulator; Described several grid resistance forms series connection and the resistor network combining in parallel.
Further, described cabinet is provided with louvre ventilation mouth.
Further, described grounding transformer is Z-type grounding transformer.
Further, described cabinet is provided with the bolt hole for fixing cabinet, and described cabinet is realized fixing and ground connection by the bolt through described bolt hole.
Further, the top of described cabinet is provided with the hole for hoist for lifting carrying.
Further, described earth resistance is nichrome resistance, electric resistance of stainless or ferrum-chromium-aluminum titanium alloy resistance.
Further, described cabinet comprises steel-frame structure and shell, and described shell is stainless steel casing, cold-rolled steel sheet plastic jetting shell or covers aluminium zine plate plastic jetting shell.
The beneficial effects of the utility model are:
The utility model is simple in structure, easy to use.Have rational radiator structure, resistor box and grounding transformer cabinet are set up in parallel, resistive element adopts lattice structure, have best cooling air flow passage, have avoided localized hyperthermia's point and the easily appearance of calcination point.
Earth resistance modularization, can combination in any by connection in series-parallel, meets the needs of different electric currents, voltage, resistance.
Brief description of the drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the Facad structure schematic diagram of an embodiment of the present utility model;
Fig. 2 be in Fig. 1 A to inner structural representation;
Fig. 3 be in Fig. 1 B to inner structural representation;
Fig. 4 is theory structure schematic diagram of the present utility model.
In figure:
1, resistor box; 2, grounding transformer cabinet; 3, instrument and control box; 4, louvre ventilation mouth; 5, observation window; 6, grid resistance; 7, insulator; 8, hole for hoist; 9, grounding transformer; 10, current transformer.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
As Figure 1-4, transformer neutral point earthing resistance cabinet in the present embodiment, comprise cabinet, cabinet comprises the resistor box 1 and the grounding transformer cabinet 2 that are set up in parallel, in resistor box 1, be provided with earth resistance, in grounding transformer cabinet 2, be provided with grounding transformer 9, earth resistance comprises several grid resistance 6 stacking up and down, is provided with insulator 7 between adjacent grid resistance 6; Several grid resistance 6 forms series connection and the resistor network combining in parallel.The ground path of earth resistance is provided with current transformer 10.
Cabinet is provided with louvre ventilation mouth 4.Grounding transformer 9 is Z-type grounding transformer.
In the present embodiment, the bottom surface of cabinet is square, and four pin of cabinet are provided with the bolt hole for fixing cabinet, be the bolt hole of φ 13 in the present embodiment, and cabinet is bolted to place to use and ground connection by what pass bolt hole.The top of cabinet is provided with the hole for hoist 8 for lifting carrying.
In the present embodiment, earth resistance is nichrome resistance, can also adopt electric resistance of stainless or ferrum-chromium-aluminum titanium alloy resistance etc.
Cabinet comprises steel-frame structure and shell, and the present embodiment housing is stainless steel casing, can also adopt cold-rolled steel sheet plastic jetting shell or cover aluminium zine plate plastic jetting shell.
In the present embodiment, on the cabinet door of cabinet, be provided with instrument and control box 3, facilitate facilities for observation parameter and operation to control.On cabinet, be also provided with observation window 5, for observing cabinet inner case.In the present embodiment, be provided with heater and blower fan, can regulate internal temperature; Inside is also provided with bulb, throws light on.
The present embodiment has rational radiator structure, and resistor box 1 is set up in parallel with grounding transformer cabinet 2, resistive element adopts lattice structure, has best cooling air flow passage, has avoided localized hyperthermia's point and the easily appearance of calcination point.Earth resistance modularization, can combination in any by connection in series-parallel, meets the needs of different electric currents, voltage, resistance.
Temperature coefficient of resistance 2.17 × 10
-4Ω DEG C, has guaranteed the sensitivity of protection.Under 1000 DEG C of high temperature, good antioxygenic property can be kept, with serious pollution environment can be applicable to.Under high temperature, have good toughness, never degenerate, not easy fracture, long service life, can reach 20 years.Tensile strength is high, can effectively resist electrodynamic effect.Fusing point is up to 1500 DEG C, and allowing in short-term temperature rise is 760 DEG C, continues to allow 385 DEG C of temperature rises.
Product can seriation, is suitable for voltage: 110V～66KV; Allow through-flow: 5A～5000A; Nominal resistance: 0.1 Ω～1500 Ω; Allow through-flow time: 10S, 30S, 60S, 2H continuous service.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (7)
1. a transformer neutral point earthing resistance cabinet, comprise cabinet, it is characterized in that: described cabinet comprises the resistor box and the grounding transformer cabinet that are set up in parallel, in described resistor box, be provided with earth resistance, in described grounding transformer cabinet, be provided with grounding transformer, described earth resistance comprises several grid resistance stacking up and down, between adjacent grid resistance, is provided with insulator; Described several grid resistance forms series connection and the resistor network combining in parallel.
2. a kind of transformer neutral point earthing resistance cabinet as claimed in claim 1, is characterized in that: described cabinet is provided with louvre ventilation mouth.
3. a kind of transformer neutral point earthing resistance cabinet as claimed in claim 2, is characterized in that: described grounding transformer is Z-type grounding transformer.
4. a kind of transformer neutral point earthing resistance cabinet as claimed in claim 3, is characterized in that: described cabinet is provided with the bolt hole for fixing cabinet, and described cabinet is realized fixing and ground connection by the bolt through described bolt hole.
5. a kind of transformer neutral point earthing resistance cabinet as claimed in claim 4, is characterized in that: the top of described cabinet is provided with the hole for hoist for lifting carrying.
6. a kind of transformer neutral point earthing resistance cabinet as claimed in claim 5, is characterized in that: described earth resistance is nichrome resistance, electric resistance of stainless or ferrum-chromium-aluminum titanium alloy resistance.
7. a kind of transformer neutral point earthing resistance cabinet as claimed in claim 6, is characterized in that: described cabinet comprises steel-frame structure and shell, and described shell is stainless steel casing, cold-rolled steel sheet plastic jetting shell or covers aluminium zine plate plastic jetting shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420071063.1U CN203747262U (en) | 2014-02-19 | 2014-02-19 | Neutral-point ground resistor cabinet of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420071063.1U CN203747262U (en) | 2014-02-19 | 2014-02-19 | Neutral-point ground resistor cabinet of transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203747262U true CN203747262U (en) | 2014-07-30 |
Family
ID=51347021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420071063.1U Expired - Fee Related CN203747262U (en) | 2014-02-19 | 2014-02-19 | Neutral-point ground resistor cabinet of transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203747262U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106597192A (en) * | 2016-11-21 | 2017-04-26 | 国网北京市电力公司 | Transformer grounding resistance device and method for detecting the same |
| CN111327029A (en) * | 2020-04-23 | 2020-06-23 | 安徽广祺智能电器股份有限公司 | Substation dynamic small resistor in-situ protection system and method thereof |
-
2014
- 2014-02-19 CN CN201420071063.1U patent/CN203747262U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106597192A (en) * | 2016-11-21 | 2017-04-26 | 国网北京市电力公司 | Transformer grounding resistance device and method for detecting the same |
| CN111327029A (en) * | 2020-04-23 | 2020-06-23 | 安徽广祺智能电器股份有限公司 | Substation dynamic small resistor in-situ protection system and method thereof |
| CN111327029B (en) * | 2020-04-23 | 2022-05-27 | 安徽广祺智能电器股份有限公司 | Substation dynamic small resistor in-situ protection system and method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104377582B (en) | Box-type substation | |
| CN203747262U (en) | Neutral-point ground resistor cabinet of transformer | |
| CN105023668A (en) | Zinc oxide arrester for power plant | |
| CN201084558Y (en) | An ultra-high voltage ceramic casing arrester | |
| CN107967392A (en) | Transformer neutral point overvoltage appraisal procedure in a kind of substation | |
| CN201845648U (en) | Primary resonance eliminator | |
| Gu et al. | Development of surge arresters with series gap against lightning breakage of covered conductors on distribution lines | |
| CN203706826U (en) | Integrated resonance eliminator capable of limiting current and voltage at one time | |
| CN204537770U (en) | Composite insulator | |
| CN103779787B (en) | Ability of swimming blow-out protection inter space device for low and medium voltage distribution network | |
| CN203086121U (en) | Falling type lightning arrester structure | |
| CN201927445U (en) | High-tension lightning arrester with shield ring | |
| CN203504002U (en) | Neutral-point grounding resistance complete set of cabinet used for dry-type grounding transformer | |
| CN201717185U (en) | Moving contact device of indoor high-voltage vacuum circuit breaker | |
| CN203573821U (en) | High-voltage parallel capacitor | |
| CN203826939U (en) | Electricity utilization system applied to high-voltage plant of large and medium-sized thermal power plant | |
| CN207038963U (en) | A kind of lightning protection power distribution cabinet | |
| CN206564423U (en) | 66kV neutral point of electric network earthing resistance cabinets | |
| Razi-Kazemi et al. | Protection of wind electrical power energy systems against indirect lightning strike surge | |
| Abd-Allah et al. | A proper design of wind turbine grounding systems under lightning | |
| CN103944070B (en) | Simple and easy overvoltage protection | |
| CN205546024U (en) | Electronic type microwave generator | |
| CN104734047A (en) | Alternating-current high-voltage power distributing cabinet | |
| CN203883462U (en) | Combined over-voltage protector based on intelligent controller | |
| CN204012614U (en) | A kind of large capacity drop-type arrester |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Neutral-point ground resistor cabinet of transformer Effective date of registration: 20160802 Granted publication date: 20140730 Pledgee: Qingdao Huitong Chinese financing Company limited by guarantee Pledgor: QINGDAO SHICHI ELECTRIC CO., LTD. Registration number: 2016990000668 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20170623 Granted publication date: 20140730 Pledgee: Qingdao Huitong Chinese financing Company limited by guarantee Pledgor: QINGDAO SHICHI ELECTRIC CO., LTD. Registration number: 2016990000668 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140730 Termination date: 20210219 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |