CN203826939U - Electricity utilization system applied to high-voltage plant of large and medium-sized thermal power plant - Google Patents

Electricity utilization system applied to high-voltage plant of large and medium-sized thermal power plant Download PDF

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Publication number
CN203826939U
CN203826939U CN201420226188.7U CN201420226188U CN203826939U CN 203826939 U CN203826939 U CN 203826939U CN 201420226188 U CN201420226188 U CN 201420226188U CN 203826939 U CN203826939 U CN 203826939U
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China
Prior art keywords
section
transformer
plant
voltage
thermal power
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Active
Application number
CN201420226188.7U
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Chinese (zh)
Inventor
朱蕊莉
张欢畅
孙进
王立康
吴小青
胡维强
陈奇
张媛
康博
蔡伟东
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Northwest Electric Power Design Institute of China Power Engineering Consulting Group
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Northwest Electric Power Design Institute of China Power Engineering Consulting Group
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Priority to CN201420226188.7U priority Critical patent/CN203826939U/en
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Abstract

The utility model provides an electricity utilization system applied to a high-voltage plant of large and medium-sized thermal power plants. According to the electricity utilization system, a transformer of the electricity utilization system of the thermal power plant adopts an angular wiring high-voltage-plant-used section, a sub-busbar section of the high-voltage-plant-used section is provided with a Z-shaped grounding transformer, and a neutral point of the Z-shaped grounding transformer is grounded through a resistor; and a neutral point is additionally arranged manually and then grounded after being connected with a resistor, the Z-shaped grounding transformer is adopted, when the electricity utilization system of the high-voltage plant is grounded via single phase, the internal overvoltage is limited, and a reliable action current is provided for the zero-sequence overcurrent protection of the transformer of the plant, thereby solving the problems that the transformer of the electricity utilization system of the thermal power plant adopts the angular wiring high-voltage-plant-used section, and the neutral point of the transformer cannot be grounded.

Description

A kind of using electricity system that is applied to big-and-middle-sized thermal power plant high pressure factory
Technical field
The utility model relates to the mode of connection of electrical system, relates in particular to a kind of using electricity system that is applied to big-and-middle-sized thermal power plant high pressure factory.
Background technology
Thermal power plant HV Auxiliary Transformer adopts angle scheme high-voltage Auxiliary section, and transformer neutral point cannot ground connection.And big-and-middle-sized thermal power plant high-voltage Auxiliary section single-phase-to-ground current generally all exceedes 10A, in the time there is single phase ground fault, will produce higher arcing ground over-voltage, and easily develop into heterogeneous short circuit.Many power plants for many years that moved are at initial operating stage, and single-line ground electric current does not exceed 10A, but along with the increase of loading in high-voltage Auxiliary section, high-tension cable is more and more, and single-phase-to-ground current increases gradually, and to equipment, operation has produced hidden danger.At present, newly-designed power plant, in order to save first investment, often utilizes the angle scheme transformer of old factory as start and stop power supply, and makes the newly-designed station service transformer cannot wiring.
Utility model content
The purpose of this utility model is to provide a kind of using electricity system that is applied to big-and-middle-sized thermal power plant high pressure factory, divide bus section, busbar section that Z-shaped grounding transformer is set in high-voltage Auxiliary section, solve thermal power plant HV Auxiliary Transformer and adopt angle scheme high-voltage Auxiliary section, the problem that transformer neutral point cannot ground connection.
For achieving the above object, the utility model adopts following technical scheme:
A kind of using electricity system that is applied to big-and-middle-sized thermal power plant high pressure factory, thermal power plant HV Auxiliary Transformer adopts angle scheme high-voltage Auxiliary section, divide on bus section, busbar section Z-shaped grounding transformer is set in high-voltage Auxiliary section, Z-shaped grounding transformer neutral point passes through grounding through resistance.
The described each transformer being connected with high-voltage Auxiliary section connects respectively 2 sections of points of bus section, busbar sections, and high-voltage Auxiliary divides bus section, busbar section subsection setup, nothing electrical connection between each point of bus section, busbar section.
Described each section point bus section, busbar section is by high-tension fuse, vacuum contactor loop and protection measure and control device access Z-type grounding transformer.
Described Z-shaped grounding transformer adopts dry-type transformer, and Z-shaped grounding transformer neutral point is by metallic resistance ground connection.
Described Z-shaped grounding transformer is three-phase six winding constructions.
The utility model divides and on bus section, busbar section, accesses respectively a Z-shaped contact transformer at station-service high pressure; a neutral point of artificial increase; then ground connection after connecting resistance; adopt Z-type grounding transformer; in the time of high-voltage Auxiliary system single-phase earthing; limited internal overvoltage, and the zero sequence overcurrent protection becoming for factory provides reliable operating current.Solve thermal power plant HV Auxiliary Transformer and adopted angle scheme high-voltage Auxiliary section, the problem that transformer neutral point cannot ground connection.
Further, Z-type grounding transformer is three-phase six winding constructions, and it has higher positive and negative order impedance.When system is normally moved, ground connection impedance is very high, and winding only flows through very little exciting current, and in the time of system generation earth fault, winding will flow through larger zero-sequence current.
Brief description of the drawings
Fig. 1 is electrical principle wiring schematic diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
Kind of the present utility model is applied to the using electricity system of big-and-middle-sized thermal power plant high pressure factory; thermal power plant HV Auxiliary Transformer adopts angle scheme high-voltage Auxiliary section; divide on bus section, busbar section by high-tension fuse, vacuum contactor loop and protection measure and control device access Z-type grounding transformer in high-voltage Auxiliary section; Z-shaped grounding transformer neutral point is by metallic resistance ground connection; it is three-phase six winding constructions that described Z-shaped grounding transformer adopts dry-type transformer, and Z-shaped grounding transformer neutral point passes through ground connection.
As shown in Figure 1, each transformer that high-voltage Auxiliary section connects connects respectively 2 sections of points of bus section, busbar sections, and high-voltage Auxiliary divides bus section, busbar section subsection setup, nothing electrical connection between each point of bus section, busbar section.Power plant high-voltage Auxiliary section, connects 6kV and divides bus section, busbar section A, B, C, D section, and then each section point bus section, busbar section accesses a Z-type grounding transformer by cable by high-tension fuse, vacuum contactor loop and an integrated protection and monitoring device.
The capacity of Z-type contact transformer can be according to formula S n=(1.732*U n* I 10S/ 3)/k calculates, wherein:
1) U nsystem rated voltage (kV)
2) I 10Sallow in short-term phase current
3) K is the grounding transformer 60s through-flow time in short-term
Neutral resistance value can be according to R n=Ue/1.732*IR calculates, wherein:
1) Ue system rated voltage (kV)
2) I rthe earth resistance electric current (A) allowing
Divide and on bus section, busbar section, access respectively a Z-shaped contact transformer at station-service high pressure; a neutral point of artificial increase; Z-shaped grounding transformer neutral point passes through grounding through resistance; solve thermal power plant HV Auxiliary Transformer and adopt angle scheme high-voltage Auxiliary section; transformer neutral point cannot ground connection problem; while exceeding for power plant high-voltage Auxiliary section capacitance current the 10A that code specifies, and station service transformer neutral point adopts the zero-sequenceprotection in the big-and-middle-sized thermal power plant of angle scheme that solution is provided.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model; can not assert that embodiment of the present utility model only limits to this; for the utility model person of an ordinary skill in the technical field; without departing from the concept of the premise utility; can also make some simple deduction or replace, all should be considered as belonging to the utility model and determine scope of patent protection by submitted to claims.

Claims (5)

1. one kind is applied to the using electricity system of big-and-middle-sized thermal power plant high pressure factory, it is characterized in that: thermal power plant HV Auxiliary Transformer adopts angle scheme high-voltage Auxiliary section, divide on bus section, busbar section Z-shaped grounding transformer is set in high-voltage Auxiliary section, Z-shaped grounding transformer neutral point passes through grounding through resistance.
2. using electricity system according to claim 1, is characterized in that: the described each transformer being connected with high-voltage Auxiliary section connects respectively 2 sections of points of bus section, busbar sections, and high-voltage Auxiliary divides bus section, busbar section subsection setup, nothing electrical connection between each point of bus section, busbar section.
3. using electricity system according to claim 1 and 2, is characterized in that: described each section point bus section, busbar section is by high-tension fuse, vacuum contactor loop and protection measure and control device access Z-type grounding transformer.
4. using electricity system according to claim 1 and 2, is characterized in that: described Z-shaped grounding transformer adopts dry-type transformer, and Z-shaped grounding transformer neutral point is by metallic resistance ground connection.
5. using electricity system according to claim 1 and 2, is characterized in that: described Z-shaped grounding transformer is three-phase six winding constructions.
CN201420226188.7U 2014-05-05 2014-05-05 Electricity utilization system applied to high-voltage plant of large and medium-sized thermal power plant Active CN203826939U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420226188.7U CN203826939U (en) 2014-05-05 2014-05-05 Electricity utilization system applied to high-voltage plant of large and medium-sized thermal power plant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420226188.7U CN203826939U (en) 2014-05-05 2014-05-05 Electricity utilization system applied to high-voltage plant of large and medium-sized thermal power plant

Publications (1)

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CN203826939U true CN203826939U (en) 2014-09-10

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108830420A (en) * 2018-06-20 2018-11-16 中国电力工程顾问集团西南电力设计院有限公司 A kind of ground connection varying capacity optimized calculation method
CN109524947A (en) * 2018-10-10 2019-03-26 国网浙江省电力有限公司台州供电公司 Wind power plant collection electric line three-step charging setting value order method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108830420A (en) * 2018-06-20 2018-11-16 中国电力工程顾问集团西南电力设计院有限公司 A kind of ground connection varying capacity optimized calculation method
CN108830420B (en) * 2018-06-20 2021-07-27 中国电力工程顾问集团西南电力设计院有限公司 Grounding variable capacity optimization calculation method
CN109524947A (en) * 2018-10-10 2019-03-26 国网浙江省电力有限公司台州供电公司 Wind power plant collection electric line three-step charging setting value order method

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C14 Grant of patent or utility model
GR01 Patent grant
C56 Change in the name or address of the patentee

Owner name: NORTHWEST ELECTRIC POWER DESIGN INSTITUTE OF CHINA

Free format text: FORMER NAME: NORTHWEST ELECTRIC POWER DESIGN INSTITUTE, CHINA POWER ENGINEERING CONSULTING GROUP CORPORATION

CP03 Change of name, title or address

Address after: 22 No. 710075, unity South Road, hi tech Industrial Development Zone, Shaanxi, Xi'an

Patentee after: NORTHWEST ELECTRIC POWER DESIGN INSTITUTE CO., LTD. OF CHINA POWER ENGINEERING CONSULTING GROUP

Address before: 710075 Xi'an province high tech Development Zone, unity South Road, No. 22, No.

Patentee before: Northwest Electric Power Design Institute, China Power Engineering Consulting Group Corporation