CN203434619U - Novel transformer neutral-point ground resistor cabinet apparatus - Google Patents

Novel transformer neutral-point ground resistor cabinet apparatus Download PDF

Info

Publication number
CN203434619U
CN203434619U CN201320570906.8U CN201320570906U CN203434619U CN 203434619 U CN203434619 U CN 203434619U CN 201320570906 U CN201320570906 U CN 201320570906U CN 203434619 U CN203434619 U CN 203434619U
Authority
CN
China
Prior art keywords
transformer
grounding
resistor
current
voltage
Prior art date
Application number
CN201320570906.8U
Other languages
Chinese (zh)
Inventor
贾振宁
Original Assignee
天津市东宝电气科技有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 天津市东宝电气科技有限公司 filed Critical 天津市东宝电气科技有限公司
Priority to CN201320570906.8U priority Critical patent/CN203434619U/en
Application granted granted Critical
Publication of CN203434619U publication Critical patent/CN203434619U/en

Links

Abstract

Disclosed in the utility model is a novel transformer neutral-point ground resistor cabinet apparatus that is secure and reliable. The apparatus consisting of a grounding transformer, a grounding resistor, an intelligent controller, a voltage transformer, a current transformer, an isolation disconnecting link and a box shell is characterized in that one end of the grounding transformer is connected with a power system bus; one end of the grounding transformer is connected to the voltage transformer by the isolation disconnecting link; the voltage transformer is connected with the ground resistor; and the ground resistor is connected with the current transformer that is grounded. The ground transformer employs a Z type wire connection-based transformer; and the structure of the ground resistor is in a wire winding state or a grid state, the resistance value range is from 1 ohm to 2000 ohm, and the value of the current flowing through the resistor is from 1A to 2000A.

Description

Novel transformer neutral-point grounding resistance cabinet device
Technical field
The utility model relates to a kind of earthing resistance cabinet.
Background technology
Earthing resistance cabinet is mainly used in system that 6-35kV cable power supply earthing capacitance current is larger.But, in the earthing resistance cabinet of prior art, when electric current is greater than setting, likely produce arc grounding overvoltage.Therefore,, in order to reduce fail safe, the reliability of power network overvoltage, raising electrical network, need Development and Production to go out safe and reliable earthing resistance cabinet.
Utility model content
The utility model discloses a kind of novel transformer neutral-point grounding resistance cabinet device; neutral point wherein adopts resistance earthing; can inject current in resistance property to fault point; the 1.05-1.1 that its resistive component electric current is capacitive component electric current doubly; thereby fault current limitation can be obtained appropriate; improve relaying protection sensitivity; make fault point only local slight damage may occur simultaneously; temporary overvoltage is restricted to 2.6 times of normal phase voltage to neutral; prevent that arc overvoltage from damaging main equipment, suppress ferro-resonance over-voltage has remarkable effect simultaneously.
Novel transformer neutral-point grounding resistance cabinet device of the present utility model, comprise grounding transformer, grounding resistor, intelligent controller, voltage transformer, current transformer, isolation switch and box-type shell, is characterized in that, one end of grounding transformer is connected with electric power system bus, one end of grounding transformer is connected to voltage transformer by isolation switch, voltage transformer is connected with grounding resistor, and grounding resistor is connected with current transformer, and current transformer is connected to ground;
Described grounding transformer adopts the transformer of Z-type wiring;
The structure of grounding resistor is wrapping wire shape or lattice-shaped, and resistance value scope is 1 Ω-2000 Ω, allows by electric current 1A-2000A.
Preferably, grounding transformer is ZN, the transformer that ynll connects.
Preferably, grounding transformer removes with arc suppression coil.
Preferably, grounding transformer is with secondary load.
Preferably, grounding resistor is combined by a plurality of resistor groups.
Preferably, grounding resistor adopts the insulation column of relevant voltage grade as fastening and support.
Preferably, the structure of this device is that integral type is installed, i.e. grounding transformer and grounding resistor unification is installed in same casing.
Preferably, this device is split type installation, is about to grounding transformer and is loaded in transformer case, and grounding resistor is installed in resistor cabinet.
Accompanying drawing explanation
Fig. 1 is the electrical structure diagram of novel transformer neutral-point grounding resistance cabinet device of the present utility model.
Embodiment
As shown in Figure 1, novel transformer neutral-point grounding resistance cabinet device of the present utility model, comprises grounding transformer 1, grounding resistor 2, intelligent controller (not shown), voltage transformer 3, current transformer 4, isolation switch 5, box-type shell (not shown) etc.Grounding transformer 1, grounding resistor 2, intelligent controller (not shown), voltage transformer 3, current transformer 4, isolation switch 5 is all placed in shell.
Wherein, one end of grounding transformer 1 is connected with electric power system bus, and one end of grounding transformer 1 is connected to voltage transformer 3 by isolation switch 5, and voltage transformer 3 is connected with grounding resistor 2, grounding resistor 2 is connected with current transformer 4, and current transformer 4 is connected to ground.
In there is no the electric power system of neutral point, need form neutral point through grounding transformer.The effect of grounding transformer is to be the wiring of △ type or Y type wiring neutral point while not drawing in electric power system, with grounding transformer, is configured to system neutral.
Grounding transformer adopts the transformer of Z-type wiring, i.e. ZN, the transformer that ynll connects.Because high voltage side of transformer adopts Z-type wiring, every phase winding forms by two sections, and lay respectively on out of phase two core limbs, two sections of coil reversed polarity connect, the zero sequence magnetic flux that two phase windings produce is cancelled out each other, therefore zero sequence impedance is very low, simultaneously no-load loss is also very little, and transformer capacity can 100% be utilized.During with common transformer band arc suppression coil, arc suppression coil capacity is no more than 20% of transformer capacity, and Z-type transformer can, with the arc suppression coil of 90%~100% capacity, can be reduced investment outlay.
Grounding transformer, except being with arc suppression coil, also can be with secondary load, replaces station with becoming.When band secondary load, a capacity of grounding transformer should be arc suppression coil and secondary load capacity sum; When grounding transformer is not with secondary load, grounding transformer capacity equals arc suppression coil capacity
Grounding resistor is the major part in neutral-point grounding resistance cabinet the complete sets of equipment, adopts high heat-resisting high duty alloy material to make.The version of resistance can be according to earth current need to make wrapping wire shape or lattice-shaped structure.General resistance combines by some groups, the flexible while being convenient to on-the-spot input.
The installation of resistance adopts the insulation column of relevant voltage grade as fastening and support.The one, can realize anti-withstand voltage insulation over the ground, the 2nd, realize the firm installation of resistance.
Grounding resistor can manufacture and design various resistance by customer requirements, and resistance value, from 1 Ω-2000 Ω, allows by electric current 1A-2000A, and error ± 3% of resistance value, allows through-flow time 10s, 15s, 30s, 60s, 2h.
The complete sets of equipment shell is installed: according to user's design requirement cabinet shell, be designed to indoor type or outdoor type.Structure can be installed for integral type, i.e. grounding transformer and grounding resistor unification is installed in same casing, or split type installation, is about to grounding transformer and is loaded in transformer case, and grounding resistor is installed in resistor cabinet.
A plurality of parameters of the intelligent controller energy monitoring resistor cabinet of ground resistance apparatus, can record single-phase-to-ground current
Size, the ground connection time, resistor disc temperature, ambient temperature and humidity, and can record landing operation number of times,
Have communication interface simultaneously, the information of detection record can be reached to master-control room, the safety that system is moved can
By property, obtain large increase, simultaneously also met the demand for development that transformer station can unattended duty.
Resistance device of the present utility model is exclusively used in transformer neutral point or generating field generator neutral point system, adopts the complete sets of equipment of high resistance grounding to realize following effect: the effect of fault restriction ground connection scaling loss generator iron-core.Restriction temporary overvoltage is greatly about 2.5 times of specified phase voltages.Suppress resonance overvoltage.Restriction single-phase earth fault current is no more than (5~15) A.Improve the sensitivity of generator protection for earthing, make protection configuration more convenient.
The above; it is only embodiment of the present utility model; but protection range of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; can expect easily changing or replacing, within all should being encompassed in protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion by the described protection range with claim.

Claims (8)

1. a novel transformer neutral-point grounding resistance cabinet device, comprises grounding transformer, grounding resistor, intelligent controller, voltage transformer, current transformer, and isolation switch and box-type shell, is characterized in that,
One end of grounding transformer is connected with electric power system bus, and one end of grounding transformer is connected to voltage transformer by isolation switch, and voltage transformer is connected with grounding resistor, and grounding resistor is connected with current transformer, and current transformer is connected to ground;
Described grounding transformer adopts the transformer of Z-type wiring;
The structure of grounding resistor is wrapping wire shape or lattice-shaped, and resistance value scope is 1 Ω-2000 Ω, allows by electric current 1A-2000A.
2. device as claimed in claim 1, is characterized in that, grounding transformer is ZN, the transformer that yn11 connects.
3. device as claimed in claim 1 or 2, is characterized in that, grounding transformer removes with arc suppression coil.
4. device as claimed in claim 1 or 2, is characterized in that, grounding transformer is with secondary load.
5. device as claimed in claim 1, is characterized in that, grounding resistor is combined by a plurality of resistor groups.
6. the device as described in claim 1 or 5, is characterized in that, grounding resistor adopts the insulation column of relevant voltage grade as fastening and support.
7. device as claimed in claim 1, is characterized in that, the structure of this device is that integral type is installed, and grounding transformer and grounding resistor unification are installed in same cabinet.
8. device as claimed in claim 1, is characterized in that, this device is split type installation, and grounding transformer is placed in transformer case, and grounding resistor is installed in resistor cabinet.
CN201320570906.8U 2013-09-16 2013-09-16 Novel transformer neutral-point ground resistor cabinet apparatus CN203434619U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320570906.8U CN203434619U (en) 2013-09-16 2013-09-16 Novel transformer neutral-point ground resistor cabinet apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320570906.8U CN203434619U (en) 2013-09-16 2013-09-16 Novel transformer neutral-point ground resistor cabinet apparatus

Publications (1)

Publication Number Publication Date
CN203434619U true CN203434619U (en) 2014-02-12

Family

ID=50063637

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201320570906.8U CN203434619U (en) 2013-09-16 2013-09-16 Novel transformer neutral-point ground resistor cabinet apparatus

Country Status (1)

Country Link
CN (1) CN203434619U (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104578040A (en) * 2014-12-26 2015-04-29 苏州市龙源电力科技股份有限公司 Neutral-point resistance grounding cabinet
CN105445511A (en) * 2015-12-11 2016-03-30 国家电网公司 Singlephase earth fault signal generating device and method for simulation isolated neutral system
CN105656016A (en) * 2016-03-02 2016-06-08 国网浙江桐乡市供电公司 Magnetic-valve-type controllable arc suppression coil structure
CN106602538A (en) * 2017-03-03 2017-04-26 中国电力工程顾问集团西南电力设计院有限公司 Type selection method of high-voltage single-core cable-sheath-protector parallel connection Z type transformer
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
CN106786384A (en) * 2015-11-24 2017-05-31 哈尔滨亚源电力有限责任公司 Generator transformer formula L-R type neutral earthing devices
CN106877306A (en) * 2017-03-08 2017-06-20 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 Arc suppression coil of power distribution network distributed compensation device integrated with distribution transformer

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104578040A (en) * 2014-12-26 2015-04-29 苏州市龙源电力科技股份有限公司 Neutral-point resistance grounding cabinet
CN106786384A (en) * 2015-11-24 2017-05-31 哈尔滨亚源电力有限责任公司 Generator transformer formula L-R type neutral earthing devices
CN105445511A (en) * 2015-12-11 2016-03-30 国家电网公司 Singlephase earth fault signal generating device and method for simulation isolated neutral system
CN105445511B (en) * 2015-12-11 2019-04-16 国家电网公司 Simulate isolated neutral system singlephase earth fault signal generation apparatus and method
CN105656016A (en) * 2016-03-02 2016-06-08 国网浙江桐乡市供电公司 Magnetic-valve-type controllable arc suppression coil structure
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
CN106602538A (en) * 2017-03-03 2017-04-26 中国电力工程顾问集团西南电力设计院有限公司 Type selection method of high-voltage single-core cable-sheath-protector parallel connection Z type transformer
CN106877306A (en) * 2017-03-08 2017-06-20 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 Arc suppression coil of power distribution network distributed compensation device integrated with distribution transformer
CN106877306B (en) * 2017-03-08 2020-05-08 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 Distribution network arc suppression coil and distribution transformer integrated distributed compensation device

Similar Documents

Publication Publication Date Title
Burke Power distribution engineering: fundamentals and applications
Wang et al. Efficient grounding for modular multilevel HVDC converters (MMC) on the AC side
Kothari et al. Power system engineering
US6888709B2 (en) Electromagnetic transient voltage surge suppression system
Moriconi et al. Development and deployment of saturated-core fault current limiters in distribution and transmission substations
JP6721620B2 (en) Surge suppression system for medium and high voltage
JP4927761B2 (en) Power line distributed series compensation system and method using passive elements
CN102044863B (en) Electrical switching apparatus including a plurality of rogowski coils and method of calibrating the same
US7489485B2 (en) Method and equipment for the protection of power systems against geomagnetically induced currents
US20170016949A1 (en) Method and apparatus for testing utility power devices
CN103310953B (en) A kind of three-phase five-limb arc
TWI487227B (en) Apparatus and method for limiting transmission of fault current
US8929048B2 (en) Very fast transient suppressing device
De Boeck et al. Configurations and earthing of HVDC grids
CN203151088U (en) Single-phase grounding fault isolation device
Xiao et al. Development of the world's first HTS power substation
JP2007525933A (en) Superconducting current limiting system and superconducting current limiting method
Park et al. Parameter optimization of SFCL with wind-turbine generation system based on its protective coordination
CN202916384U (en) Improved voltage transformer zero sequence circuit system capable of improving precision of line selection and fault positioning
Ha et al. Novel scheme of travelling wave based differential protection for bipolar HVDC transmission lines
Badrzadeh et al. Transients in wind power plants—Part I: Modeling methodology and validation
Turner et al. Transformer inrush currents
Maguire et al. Status of high temperature superconductor cable and fault current limiter projects at American Superconductor
Tavakoli et al. Comparison between suppressing approaches of very fast transients in gas-insulated substations (GIS)
Abramovitz et al. Prototyping and testing of a 15 kV/1.2 kA saturable core HTS fault current limiter

Legal Events

Date Code Title Description
GR01 Patent grant
C14 Grant of patent or utility model