CN105375454A - Short circuit fault current limiter - Google Patents
Short circuit fault current limiter Download PDFInfo
- Publication number
- CN105375454A CN105375454A CN201510772037.0A CN201510772037A CN105375454A CN 105375454 A CN105375454 A CN 105375454A CN 201510772037 A CN201510772037 A CN 201510772037A CN 105375454 A CN105375454 A CN 105375454A
- Authority
- CN
- China
- Prior art keywords
- current limiter
- fault current
- circuit
- short
- lightning arrester
- 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.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
- H02H9/047—Free-wheeling circuits
Abstract
A short circuit fault current limiter is disclosed. The short circuit fault current limiter comprises a lightning arrester and an inductor L1 that are connected in series; the lightning arrester is connected with a capacitor C1 in parallel; the lightning arrester is connected with a capacitor bank C2 in parallel; the capacity of the capacitor back is adjustable; the lightning arrester is connected with a series-wound circuit formed by an inductor L2 and a transistor T1 in parallel; and the transistor T1 is in anti-parallel connection with a transistor T2. According to the short circuit fault current limiter provided with the invention, the short circuit fault current limiter has the purpose of limiting the short circuit under the fault states, as well as has the purpose of reducing the circuit power consumption when the system runs normally; and in addition, the current limiter has the characteristics of simple structure and low cost.
Description
Technical field
The present invention relates to short-circuit limitation technology field, particularly relate to a kind of short-circuit fault current limiter.
Background technology
Due to the development of electric power system, unit and station capacity, substation capacity, city and the load in the center of industry and the sustainable growth of load density, the application of Low ESR high-power transformer in modernization low-voltage distribution system constantly increases and the development of distribution network, and bulk power grid is interconnected and transnational interconnected growing, makes the short circuit current in present large power system voltage Grid at different levels, capacity of short circuit has the trend day by day increased.This just requires various transmitting and transforming equipment in electrical network, the bus of such as killer switch equipment, transformer, instrument transformer and transformer station, framework, wire and support insulator and ground network etc., must meet short circuit current level and improve the harsher requirement brought.
When electric power system is short-circuited, electric current sharply increases, such as during generator outlet end place three-phase shortcircuit, even the maximum instantaneous value of electric current up to tens of rated current times decades of times, can reach ampere up to ten thousand from absolute value, even hundreds of thousands ampere, meanwhile, the voltage in system will significantly decline, such as, during system generation three-phase shortcircuit, the voltage of short dot drops to zero, and near short dot, the voltage of each point also will obviously reduce.
In electric power system both at home and abroad, the measure of limiting short-circuit current has a lot at present, mainly contain: ensure each electric pressure balanced development of electric power system, low-voltage electrical network divides section to run, change the operational mode of electrical network, bus fanout operation or bus section run, in electrical network, adopt high resistant equipment, transformer adopts Neutral grounding via small reactor and adopts the methods such as fault current limiter.The features such as what current application was maximum is also, and most effective method seals in fault current limiter in electric power system, and it is simple that this method has structure, do not need to change the original network of electric power system, cheap and limiting short-circuit current successful.
The development of power electronic technology in recent years makes power electronic device be applied in short circuit current limiter to become possibility.Power electronic device has low in energy consumption, and switching speed is fast, the features such as volume is little, and when fault occurs, thyristor conducting when current over-zero, can not cause overvoltage and additional concussion.Reducing gradually of power electronic device price has promoted its application in fault current limiter.
Summary of the invention
In order to solve the problems of the technologies described above, the present invention proposes a kind of short-circuit fault current limiter, with the object of short circuit current under fault restriction state, has in addition and reduces circuit without the object reaching merit loss when system is normally run.It is simple that this flow restricter has structure, feature with low cost.
To achieve these goals, the scheme that the present invention adopts is:
A kind of short-circuit fault current limiter, comprise the lightning arrester and inductance L 1 that are connected in series, described lightning arrester is connected in parallel electric capacity C1, described lightning arrester is connected in parallel Capacitor banks C2, the capacitance of described Capacitor banks C2 can regulate, described lightning arrester is connected in parallel the series circuit be made up of with thyristor T1 inductance L 2, and described thyristor T1 is connected in antiparallel thyristor T2.
The series circuit be made up of thyristor Ki and electric capacity Ci that described capacitor C2 is connected in parallel with each other by several forms.
Road fault current limiter; Single-phase short-circuit fault current limiter described in three accesses between three phase mains and three loads respectively, forms three phase short circuit fault flow restricter.
Beneficial effect of the present invention is:
1, adopt the dynamically adjustable Capacitor banks of capacity to coordinate with current limiting reactor, achieve when circuit normally works, the number sealing in the capacitor of circuit by adjustment regulates the compensativity to line reactance size.
2, reactor and capacitor are when Power System Steady-state runs, and be in resonance condition, impedance is little, stable state electric energy loss is little, do not cause the harmonious wave interference of pressure drop to electrical network.
3, thyristor is in normal state and closes section state, decreases the steady-state loss of system.
4, condenser capacity is dynamically adjustable, in normal state, dynamic adjustments can seal in the condenser capacity of circuit, thus regulate the degree of compensation to circuit induction reactance.
5, condenser capacity is dynamically adjustable, under nonserviceabling, dynamic adjustments can seal in the condenser capacity of circuit, thus change the induction reactance size that fault current limiter seals in circuit.
6, in circuit, the effect of lightning arrester is the overvoltage of restriction electric power system, plays the effect of capacitor for voltage protection.Lightning arrester is in normal state in high-impedance state, and when the voltage at capacitor two ends reaches the conducting voltage of lightning arrester, lightning arrester presents low resistance state, the voltage at limiting capacitance device two ends.When the voltage resume at capacitor two ends, lightning arrester returns to high-impedance state again.
Accompanying drawing explanation
Fig. 1 is the circuit theory schematic diagram that the present invention specifically implements;
Fig. 2 is the connection diagram of the present invention in single phase circuit;
Fig. 3 is the connection diagram of the present invention in three-phase circuit.
Embodiment
In order to better understand technical scheme of the present invention, below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, a kind of short-circuit fault current limiter, comprise the lightning arrester and inductance L 1 that are connected in series, lightning arrester is connected in parallel electric capacity C1, lightning arrester F is connected in parallel Capacitor banks C2, the capacitance of Capacitor banks C2 can regulate, and lightning arrester is connected in parallel the series circuit be made up of with thyristor T1 inductance L 2, and thyristor T1 is connected in antiparallel thyristor T2.The series circuit be made up of thyristor Ki and electric capacity Ci that capacitor C2 is connected in parallel with each other by several forms.I be more than or equal to 3 positive integer.
Be connected in antiparallel and refer to, the anode of thyristor T1 negative electrode and thyristor T2 is in same node, and the negative electrode of thyristor T1 anode and thyristor T2 is in same node.
As shown in Figure 2 and Figure 3, described short-circuit fault current limiter seal in AC power, circuit breaker and be responsible between form single-phase short-circuit fault current limiter; Single-phase short-circuit fault current limiter described in three accesses between three phase mains and three loads respectively, forms three phase short circuit fault flow restricter.
Within short circuit current is generally limited in the scope of circuit permission by fault current limiter in one-period (20ms); and there is the ability of short time steady operation; so that relaying protection device optionally excises fault; after failture evacuation; fault current limiter should return to normal condition rapidly, thus the reliable and stable operation of the system of guarantee.
During normal work, the inductance of system is the first reactor inductance L1 and line inductance L
lsum, realizes the size of capacitance value by the quantity sealing in electric capacity Ci in circuit of thyristor Ki regulating capacitor group, makes the total inductance of the first capacitor C1 and the second capacitor C2 sum and system be in series resonance state under power frequency.Load current flows through reactor and Capacitor banks, and capacitor and reactor are resonance condition under fundamental frequency (50Hz).Under series resonance state, impedance is very little, is similar to short circuit, and power consumption is very low.When short trouble occurs, the turn on thyristors in parallel with Capacitor banks, reactor seals in circuit, thus limits the size of short circuit current.When an error occurs, the rapid conducting of thyristor of reverse parallel connection, the second reactor L2 seals in circuit, and now fault current limiter seals in the total impedance of circuit and is
Wherein, C=C1+C2.
From above formula, by regulating the size of the second capacitor C2, the impedance magnitude sealing in circuit of fault current limiter under malfunction can be changed.And when there is parallel resonance in capacitor C1, C2 and the second reactor L2 under power frequency, i.e. ω
2during LC=1, the total impedance X of fault current limiter
fCLfor infinity, circuit is equivalent to open circuit.
When fault occurs, thyristor can rapidly conducting, in very short time, current limiting reactor is sealed in circuit, within the maximum current allowed at circuit by fault current limitation.
Lightning arrester in parallel is used for restriction system overvoltage, and prevent overvoltage from producing equipment and damage, lightning arrester generally adopts the piezo-resistances such as zinc oxide.In high-impedance state under normal condition, present low resistance state rapidly, over-voltage amplitude when terminal voltage reaches the starting resistor of lightning arrester, magnitude of voltage recovers normally, and lightning arrester returns to high-impedance state rapidly again, to ensure system worked well.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (3)
1. a short-circuit fault current limiter, it is characterized in that, comprise the lightning arrester and inductance L 1 that are connected in series, described lightning arrester is connected in parallel electric capacity C1, described lightning arrester is connected in parallel Capacitor banks C2, the capacitance of described Capacitor banks C2 can regulate, and described lightning arrester is connected in parallel the series circuit be made up of with thyristor T1 inductance L 2, and described thyristor T1 is connected in antiparallel thyristor T2.
2. a kind of short-circuit fault current limiter according to claim 1, is characterized in that, the series circuit be made up of thyristor Ki and electric capacity Ci that described capacitor C2 is connected in parallel with each other by several forms.
3. a kind of short-circuit fault current limiter according to claim 1 and 2, is characterized in that, described short-circuit fault current limiter seal in AC power, circuit breaker and be responsible between form single-phase short-circuit fault current limiter; Single-phase short-circuit fault current limiter described in three accesses between three phase mains and three loads respectively, forms three phase short circuit fault flow restricter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510772037.0A CN105375454A (en) | 2015-11-12 | 2015-11-12 | Short circuit fault current limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510772037.0A CN105375454A (en) | 2015-11-12 | 2015-11-12 | Short circuit fault current limiter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105375454A true CN105375454A (en) | 2016-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510772037.0A Pending CN105375454A (en) | 2015-11-12 | 2015-11-12 | Short circuit fault current limiter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107171303A (en) * | 2017-05-26 | 2017-09-15 | 湖北工业大学 | A kind of short circuit current flow blocks circuit |
| GB2560297A (en) * | 2017-01-24 | 2018-09-12 | Gridon Ltd | DC Power supply arrangement |
| WO2018173054A1 (en) * | 2017-03-21 | 2018-09-27 | Gridon Ltd. | Ac switching arrangement |
| CN110277777A (en) * | 2019-07-11 | 2019-09-24 | 湖南大学 | Fault current discharge device and electric system with overvoltage protection |
| CN113258761A (en) * | 2021-05-17 | 2021-08-13 | 东南大学 | Modular multilevel converter for inhibiting fault current and control method thereof |
| CN113285433A (en) * | 2021-01-27 | 2021-08-20 | 安徽一天电气技术股份有限公司 | Short circuit current peak-limiting current-limiting system |
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| CN201466702U (en) * | 2009-07-27 | 2010-05-12 | 北京交通大学 | Parallel resonant short-circuit fault current limiter with series compensation function |
| KR20120064516A (en) * | 2010-12-09 | 2012-06-19 | 주식회사 포스코아이씨티 | Micro pulse power supply circuit and micro pulse system comprising the same |
| CN104124674A (en) * | 2014-07-21 | 2014-10-29 | 国家电网公司 | IGCT (Integrated Gate Commutated Thyristor) semiconductor switching device based short-circuit current limit method |
| CN204391749U (en) * | 2015-01-28 | 2015-06-10 | 湖南大学 | Resonant mode current limiting system |
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2015
- 2015-11-12 CN CN201510772037.0A patent/CN105375454A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201466702U (en) * | 2009-07-27 | 2010-05-12 | 北京交通大学 | Parallel resonant short-circuit fault current limiter with series compensation function |
| KR20120064516A (en) * | 2010-12-09 | 2012-06-19 | 주식회사 포스코아이씨티 | Micro pulse power supply circuit and micro pulse system comprising the same |
| CN104124674A (en) * | 2014-07-21 | 2014-10-29 | 国家电网公司 | IGCT (Integrated Gate Commutated Thyristor) semiconductor switching device based short-circuit current limit method |
| CN204391749U (en) * | 2015-01-28 | 2015-06-10 | 湖南大学 | Resonant mode current limiting system |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2560297A (en) * | 2017-01-24 | 2018-09-12 | Gridon Ltd | DC Power supply arrangement |
| WO2018173054A1 (en) * | 2017-03-21 | 2018-09-27 | Gridon Ltd. | Ac switching arrangement |
| US11239657B2 (en) | 2017-03-21 | 2022-02-01 | Gridon Ltd. | AC switching arrangement |
| CN107171303A (en) * | 2017-05-26 | 2017-09-15 | 湖北工业大学 | A kind of short circuit current flow blocks circuit |
| CN107171303B (en) * | 2017-05-26 | 2019-04-12 | 湖北工业大学 | A kind of short circuit current blocking circuit |
| CN110277777A (en) * | 2019-07-11 | 2019-09-24 | 湖南大学 | Fault current discharge device and electric system with overvoltage protection |
| CN113285433A (en) * | 2021-01-27 | 2021-08-20 | 安徽一天电气技术股份有限公司 | Short circuit current peak-limiting current-limiting system |
| CN113285433B (en) * | 2021-01-27 | 2022-01-04 | 安徽一天电气技术股份有限公司 | Short circuit current peak-limiting current-limiting system |
| WO2022161217A1 (en) * | 2021-01-27 | 2022-08-04 | Anhui Onesky Electric Tech.Co.Ltd | A system for limiting a peak current of short-circuit current |
| US11600460B2 (en) | 2021-01-27 | 2023-03-07 | Anhui Onesky Electric Tech. Co. Ltd | System for limiting a peak current of short-circuit current |
| CN113258761A (en) * | 2021-05-17 | 2021-08-13 | 东南大学 | Modular multilevel converter for inhibiting fault current and control method thereof |
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Application publication date: 20160302 |
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