Typical power plant lightning arrester configuration and insulation coordination modeling method
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A technology of insulation coordination, modeling method, applied in the field of electric power, can solve problems such as lack of solutions
Active Publication Date: 2018-06-29
SHANDONG ELECTRIC POWER ENG CONSULTING INST CORP
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Problems solved by technology
[0005] To sum up, in the prior art, there is still no effective solution to the problem of how to configure the arrester in the power plant
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no. 1 Embodiment
[0135] In a typical power plant design, it is necessary to configure surge arresters at the generator outlet, transformer outlet, busbar, GIS inlet, and 500kV outlet of the power plant. The determination of the final parameters of the arrester refers to the provisions of "Technical Regulations for Overvoltage Protection of Power Equipment", "Regulations for Lightning Arresters" and "Code for Design of Overvoltage Protection and Insulation Coordination of AC Electrical Installations", and the specific calculation process is obtained. The first specific implementation example: 27kV insulation coordination design process:
[0136] 1.1 Input volume
[0137] a) The highest system voltage Us=24kV(r.m.s, phase to phase)
[0138] b) Pollution level: mild
[0139] c) Altitude: 1000m
[0140] d) Lightning shock protection level of arrester Ups=410kV, Upl=80kV
[0142] f) Number of iron tower lines (number of lines entering the su...
no. 2 Embodiment
[0152] The second specific implementation example of the present invention: 500kV insulation coordination calculation process:
[0153] 2.1 Input quantity:
[0154] a) System nominal voltage U n =500kV;
[0155] b) The highest voltage U of the equipment m =550kV;
[0156] c) Reference voltage 1.0p.u.=317kV;
[0157] d) Altitude H;
[0158] e) Factor A for overhead lines;
[0159] f) The minimum number of overhead lines n connected to the substation;
[0160] g) The distance L between the arrester and the protected equipment;
[0161] h) Line span L sp ;
[0162] i) The length L of the overhead line when the lightning flashover rate is an acceptable failure rate a ;
[0163] j) The test conversion factor a for converting the required short-duration power frequency voltage into the operating impulse withstand voltage in Table 3 1 (inner insulation), a 2 (outer insulation);
[0164] k) air gap distance D;
[0165] l) ground height H t
[0166] 2.2 Parameter def...
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Abstract
The invention discloses a typical power plant lightning arrester configuration and insulation coordination modeling method. The method comprises the following steps that a transient simulation programis applied to build a typical power plant simulation model conforming to the actual situation on site; in a zinc oxide lightning arrester model, zinc oxide lightning arrester model parameters are set; a rated voltage value of a lightning arrester comprises slow-front overvoltage and fast-front overvoltage; assuming that any leading-out terminal of a power plant is subjected to random lightning overvoltage attack, modeling is conducted on power plant main electrical connection, the built typical power plant simulation model runs, voltage waveforms of all reference points are observed, and insulation and system stability of a main electrical system of the power plant provided with the zinc oxide lightning arrester are verified. Accordingly, the number and positions of the power plant lightening arresters are subjected to optimization selection, the insulation level of equipment is determined according to regulation, the insulation margin is verified, and guidance is provided for insulation coordination design of the typical power plant.
Description
technical field [0001] The invention relates to the field of electric power technology, in particular to a modeling method for the configuration and insulation coordination of lightning arresters in typical power plants. Background technique [0002] As the producer of electric energy in the power system, the power plant plays an important role in the power system. In some thundery areas of our country, the insulation and safety of electrical equipment in power plants will face serious threats in thundery weather. In view of the importance of power plants to the normal operation of power systems, how to effectively protect electrical equipment in power plants from lightning overvoltage intrusion becomes more important. As an important link in the lightning protection design of electrical equipment in power plants, the arrester's insulation coordination and configuration directly affect the level of lightning impact on electrical equipment and the selection of safety distanc...
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Application Information
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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/367Y02E60/00
Inventor 陈平樊潇魏华栋邹杰徐雪源贺艳辉冯宝玥
Owner SHANDONG ELECTRIC POWER ENG CONSULTING INST CORP
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