CN112419822A - 10KV distribution network equivalent test low-voltage simulation system and simulation method thereof - Google Patents
10KV distribution network equivalent test low-voltage simulation system and simulation method thereof Download PDFInfo
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- CN112419822A CN112419822A CN202011275525.8A CN202011275525A CN112419822A CN 112419822 A CN112419822 A CN 112419822A CN 202011275525 A CN202011275525 A CN 202011275525A CN 112419822 A CN112419822 A CN 112419822A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B9/00—Simulators for teaching or training purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
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- G—PHYSICS
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- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
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- G09B23/18—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism
- G09B23/187—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism for measuring instruments
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/18—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism
- G09B23/188—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism for motors; for generators; for power supplies; for power distribution
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Abstract
The invention discloses a 10KV distribution network equivalent test low-voltage simulation system and a simulation method thereof, wherein the system comprises a system simulation power supply, a magnetic saturation isolation transformer, a simulation power transmission line, a three-phase transformer and a distribution low-voltage load, the system simulation power supply and an output end are sequentially connected with the magnetic saturation isolation transformer, the simulation power transmission line, the three-phase transformer and the distribution low-voltage load, and a low-voltage 3-phase external breaker switch and a low-voltage breaker are installed on the simulation power transmission line. The simulation design of the low-voltage equivalent line is fully utilized, the low-level line voltage is used for simulating the electrical characteristics of a 10KV distribution network, the cost of complete equipment can be further reduced, the safety protection standard requirement is obviously reduced, and the psychological pressure of training personnel is eliminated.
Description
Technical Field
The invention relates to a 10KV distribution network equivalent test low-voltage simulation system and a simulation method thereof, and belongs to the technical field of 10KV distribution network equivalent test low-voltage simulation.
Background
At present, the 10KV power system in China mostly adopts a three-phase neutral point ungrounded system design: namely, except that the distributed capacitance of the power equipment of the 10KV power distribution network can be grounded, the other parts are not grounded. The design of the power distribution network system has the advantages that when the ground fault occurs, the fault current is small, the damage to power equipment is not serious, and therefore the power distribution network system can continue to operate for 1-2 hours according to the power operation regulation under the condition that a single-phase ground does not form a short circuit loop. The disadvantages are that: when a single-phase earth fault occurs, instantaneous overvoltage can be generated, so that equipment and personal safety are threatened, and therefore, power distribution network operation management personnel require to quickly find out and cut off a fault line, otherwise, the fault expansion can be caused, and the safety of a power system and the equipment is endangered.
Safe operation maintenance of the 10KV power distribution network, rapid finding of a fault line when a fault occurs and normal operation recovery, and high requirements on operation and maintenance personnel of a power supply department are provided: the operation and maintenance personnel of the power distribution network must deeply master the operation characteristics of a 10KV three-phase neutral point ungrounded system, and on the basis, various technologies such as power distribution automation owned by a power department are fully utilized to realize high-level operation and maintenance of the power distribution network.
Because the 10KV power distribution network is a medium-voltage power transmission network, various operation experiments are directly carried out on the line with the voltage level due to high voltage and large transmission power, and the defects of high technical difficulty, large risk and the like exist.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the utility model provides a 10KV distribution network equivalent test low-voltage simulation system and a simulation method thereof, which are used for solving the problems in the prior art.
The technical scheme adopted by the invention is as follows: the utility model provides a 10KV joins in marriage net equivalent test low pressure analog system, includes system analog power supply, magnetic saturation isolation transformer, simulation power transmission line, three-phase transformer and distribution low pressure load, and system analog power supply, output connect gradually magnetic saturation isolation transformer, simulation power transmission line, three-phase transformer and distribution low pressure load, install low pressure 3 external circuit breaker switches of looks and low-voltage circuit breaker on the simulation power transmission line.
Preferably, the system simulates low voltage distribution of power using a utility grid, and AC220V three-phase four-low voltage distribution.
Preferably, the analog transmission line uses a 2.5 mm square multi-strand insulated wire.
Preferably, the analog power transmission line uses 300 meters by 3 outgoing lines each.
Preferably, the magnetic saturation isolation transformer is a 3-phase ac voltage regulator.
Preferably, the test site is provided with a plurality of independent grounding points.
Preferably, the magnetic saturation isolation transformer uses 1: 1 magnetic saturation isolation transformer, input Y-type, output triangle.
A simulation method of a 10KV distribution network equivalent test low-voltage simulation system comprises the following steps: a magnetic saturation isolation transformer is utilized to convert three-phase four-wire AC220V low-voltage distribution into a low-voltage AC380V transmission system of a three-phase three-wire system with a low-voltage neutral point ungrounded, and the simulation of a 10KV neutral point ungrounded distribution network transmission system is realized through the opening and closing of a breaker switch and a low-voltage breaker.
The invention has the beneficial effects that: compared with the prior art, the invention has the following effects:
(1) the simulation design of the low-voltage equivalent line is fully utilized, the electrical characteristics of the 10KV distribution network are simulated by using the low-level line voltage, the cost of complete equipment can be further reduced, the safety protection standard requirement is obviously reduced, and the psychological pressure of training personnel is eliminated;
(2) various low-voltage power distribution equipment can be fully utilized, flexible field working mode selection is realized, the working efficiency is effectively improved, and the workload of training and experimental testing is simplified;
(3) the equivalent platform power supply uses three-phase four-wire 400V low-voltage power distribution, and is easy to erect and install;
(4) by adopting the design of the isolation transformer, the equivalent test platform is separated from the main network, and the damage caused by accidental electric shock of platform testers is avoided.
Drawings
FIG. 1 is a schematic diagram of an AC380V three-phase regulated design;
fig. 2 is a design schematic diagram of a 10KV distribution network equivalent test low-voltage simulation system.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments.
Example 1: as shown in fig. 1-2, a 10KV distribution network equivalent test low-voltage simulation system comprises a system simulation power supply, a magnetic saturation isolation transformer, a simulation power transmission line, a three-phase transformer and a distribution low-voltage load, wherein the system simulation power supply and an output end are sequentially connected with the magnetic saturation isolation transformer, the simulation power transmission line, the three-phase transformer and the distribution low-voltage load, a low-voltage 3-phase external breaker switch and a low-voltage breaker are installed on the simulation power transmission line, a low-voltage 3-phase external breaker switch (with a switch control function) is used at a section point in the middle of the simulation power transmission line, and a low-voltage breaker is used for simulating a medium-voltage breaker (capable of simulating a reclosing. Customizing a plurality of sets 1: 1 three-phase transformer (capacity 200W, output three-phase four, phase voltage AC 220V) for simulating a 10KV distribution transformer; and simultaneously, a small electric fan, a bulb and the like are used for simulating a power distribution low-voltage load.
Preferably, the system simulates low voltage distribution of power using a utility grid, AC220V three-phase four-low voltage distribution, line voltage AC220V (equivalent phase-to-ground voltage AC 220V), line power: not more than 2 KW; using low voltage distribution of the utility grid (AC 220V three-phase four low voltage distribution) as the system analog power source, 1: the 1 magnetic saturation isolation transformer (input Y-shaped and output triangular) is changed into AC380V three-phase four-low voltage distribution, so that the safety protection effect can be achieved when single-phase grounding or interphase short circuit is simulated.
Preferably, the analog power transmission line adopts a 2.5 square millimeter multi-strand insulated wire; each outgoing line is 300 meters × 3 for the simulation transmission line, and the 10KV distribution network outgoing line of the simulation transformer substation is adopted.
Preferably, in order to ensure the stability of the input power supply, the platform of the 3-phase alternating current voltage stabilizer of the magnetic saturation isolation transformer is additionally provided with 1 set of 3-phase alternating current voltage stabilizer before the input isolation transformer.
Preferably, the test site is provided with a plurality of independent grounding points for simulating single-phase grounding fault test.
Example 2: a simulation method of a 10KV distribution network equivalent test low-voltage simulation system comprises the following steps: the magnetic saturation isolation transformer is utilized to convert three-phase four-wire AC220V low-voltage distribution into a low-voltage AC380V transmission system of a three-phase three-wire system with a low-voltage neutral point ungrounded, and the magnetic saturation isolation transformer is used for simulating a 10KV neutral point ungrounded distribution network transmission system. The design solves the problems that various three-phase three-wire system neutral point ungrounded transmission system tests are difficult to perform and the electrical parameters are safely and efficiently measured due to the high voltage level of the 10KV distribution network transmission system.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and therefore, the scope of the present invention should be determined by the scope of the claims.
Claims (8)
1. A10 KV distribution network equivalent test low-voltage simulation system is characterized in that: the system simulation power supply and the output end are sequentially connected with the magnetic saturation isolation transformer, the simulation power transmission line, the three-phase transformer and the distribution low-voltage load, and the simulation power transmission line is provided with a low-voltage 3-phase external circuit breaker switch and a low-voltage circuit breaker.
2. The 10KV distribution network equivalent test low-voltage simulation system according to claim 1, characterized in that: the system analog power source utilizes low voltage distribution of the utility grid, AC220V three-phase four low voltage distribution.
3. The 10KV distribution network equivalent test low-voltage simulation system according to claim 1, characterized in that: the analog transmission line uses 2.5 mm square multi-strand insulated wire.
4. The 10KV distribution network equivalent test low-voltage simulation system according to claim 1, characterized in that: the simulation power transmission line adopts 300 meters by 3 outgoing lines.
5. The 10KV distribution network equivalent test low-voltage simulation system according to claim 1, characterized in that: a3-phase AC voltage stabilizer of a magnetic saturation isolation transformer.
6. The 10KV distribution network equivalent test low-voltage simulation system according to claim 1, characterized in that: a plurality of independent grounding points are arranged on the test site.
7. The 10KV distribution network equivalent test low-voltage simulation system according to claim 1, characterized in that: the magnetic saturation isolation transformer uses 1: 1 magnetic saturation isolation transformer, input Y-type, output triangle.
8. The simulation method of the 10KV distribution network equivalent test low-voltage simulation system according to any one of claims 1 to 6, characterized in that: the method comprises the following steps: a magnetic saturation isolation transformer is utilized to convert three-phase four-wire AC220V low-voltage distribution into a low-voltage AC380V transmission system of a three-phase three-wire system with a low-voltage neutral point ungrounded, and the simulation of a 10KV neutral point ungrounded distribution network transmission system is realized through the opening and closing of a breaker switch and a low-voltage breaker.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011275525.8A CN112419822A (en) | 2020-11-16 | 2020-11-16 | 10KV distribution network equivalent test low-voltage simulation system and simulation method thereof |
| PCT/CN2020/131727 WO2022099796A1 (en) | 2020-11-16 | 2020-11-26 | 10 kv distribution network equivalent test low voltage simulation system and simulation method therefor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011275525.8A CN112419822A (en) | 2020-11-16 | 2020-11-16 | 10KV distribution network equivalent test low-voltage simulation system and simulation method thereof |
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| CN112419822A true CN112419822A (en) | 2021-02-26 |
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| CN115331497A (en) * | 2022-08-11 | 2022-11-11 | 国网江苏省电力有限公司连云港供电分公司 | Power distribution network equipment comprehensive uninterrupted construction modular simulation training simulation system |
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2020
- 2020-11-16 CN CN202011275525.8A patent/CN112419822A/en active Pending
- 2020-11-26 WO PCT/CN2020/131727 patent/WO2022099796A1/en active Application Filing
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| US20140072950A1 (en) * | 2011-05-10 | 2014-03-13 | Anhui Electric Power Research Institute | Power frequency parameter simulation system for a power transmission line and control method thereof |
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| CN104101799A (en) * | 2014-06-11 | 2014-10-15 | 国家电网公司 | Modular distribution network dynamic simulation and terminal test integration system |
| CN106159920A (en) * | 2016-08-30 | 2016-11-23 | 泉州维盾电气有限公司 | A kind of 10kV electrical network feeder fault processes physics simulator |
| CN109669103A (en) * | 2017-10-13 | 2019-04-23 | 中国电力科学研究院 | A kind of polymorphic complex fault analogue test platform of true type power distribution network and test method |
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| WO2022099796A1 (en) | 2022-05-19 |
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Application publication date: 20210226 |