CN215678700U - High-coupling split reactor type current limiter short-circuit current limiting test loop - Google Patents
High-coupling split reactor type current limiter short-circuit current limiting test loop Download PDFInfo
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- CN215678700U CN215678700U CN202121318230.4U CN202121318230U CN215678700U CN 215678700 U CN215678700 U CN 215678700U CN 202121318230 U CN202121318230 U CN 202121318230U CN 215678700 U CN215678700 U CN 215678700U
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Abstract
The application discloses experimental return circuit of high coupling split reactor type current limiter short circuit current limit experiment includes current source return circuit and voltage source return circuit. One end of the current source loop is connected with one end of a current limiter to be verified, and the other end of the current source loop is connected with the other end of the current limiter and grounded; one end of the voltage source loop is connected with a bridge arm of a high-coupling splitting reactor provided with a pot type quick switch in the current limiter, and the other end of the voltage source loop is connected with the other end of the current limiter and grounded. The test loop can be used for verifying the current limiting characteristic of the high-coupling split reactor type current limiter under the laboratory condition.
Description
Technical Field
The application relates to the technical field of electric equipment, in particular to a test loop for a short-circuit current limiting test of a high-coupling split reactor type current limiter.
Background
Due to the scale-up of power grids, the increase of interconnection degree and the access of large power stations, the fault current level of the power grids gradually approaches or even exceeds the upper limit of the breaking capacity of the existing operating switch equipment. In order to ensure the safe operation of the power system and comprehensively consider the factors of safety, reliability, economy and the like, a Fault Current Limiter FCL (Fault Current Limiter, abbreviated as Fault Current Limiter or Current Limiter) has become an important technical means for dealing with the rapid increase of Fault Current.
The fault current limiter is used for limiting the effective value and/or the peak value of the short-circuit current when the system has a short-circuit fault so as to relieve the opening pressure of a main circuit breaker of the system. Fault current limiters with various structures appear in the market at present, wherein a high-voltage alternating current fault current limiter based on a high-coupling split reactor realizes a current limiting function by matching a pot-type quick switch with the high-coupling split reactor, and the pot-type quick switch is connected with one arm of the high-coupling split reactor in series. When the system has short-circuit fault, the fault rapid identification system rapidly identifies the fault and sends a control instruction, the control tank type rapid switch rapidly acts to cut off the single-arm current when the high-coupling split reactor is coupled, so that the high-coupling split reactor is decoupled, the short-circuit current is transferred to the other arm, and the fault current is limited by the sudden increase of the impedance of the current limiter. Fig. 1 shows a schematic diagram of a high-voltage ac current limiter based on a high-coupling splitting reactor, where QF is a main circuit breaker, FCL is a fault current limiter, TFS1 and TFS2 are tank-type fast switches, and HCSR is a high-coupling splitting reactor. The tank type quick switch generally adopts a modular design, and can meet the requirements of different voltage grades through multi-unit series connection.
In order to ensure the safe operation of the system, the short-circuit current limiting test verification needs to be carried out on the current limiter. The impedance of the high-coupling split reactor in a coupling state is very small, but the single-arm reactance is very large after decoupling, and because the capacity of a laboratory power supply is limited, short-circuit current required in a current limiting state cannot be provided under the laboratory condition, and the recovery voltage applied to the tank type quick switch cannot meet the test requirement, so that the current limiting characteristic of the current limiter is difficult to directly verify under the current laboratory condition.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present application provides a test loop of a short-circuit current limiting test of a high-coupling split reactor type current limiter, which is used for verifying the current limiting characteristics of a fault current limiter under laboratory conditions.
In order to achieve the above object, the following solutions are proposed:
a test loop for a short-circuit current limiting test of a high-coupling split reactor type current limiter comprises a current source loop and a voltage source loop, wherein:
one end of the current source loop is connected with one end of a current limiter to be verified, and the other end of the current source loop is connected with the other end of the current limiter and grounded;
one end of the voltage source loop is connected with a bridge arm of a high-coupling splitting reactor provided with a pot type quick switch in the current limiter, and the other end of the voltage source loop is connected with the other end of the current limiter and grounded.
Optionally, the current source loop includes a short-circuit generator, a first protection circuit breaker, a second protection circuit breaker, a first closing switch, a second closing switch, a first regulation reactor, a second regulation reactor, a first operation switch, a second operation switch, a short-circuit transformer, a first gap device, a first resistance-capacitance voltage divider, and a first magnetic potentiometer.
Optionally, the current source loop further comprises an auxiliary switch.
Optionally, the current limiter includes a high-coupling splitting reactor, a first tank type fast switch and a second tank type fast switch are connected in series to one bridge arm of the high-coupling splitting reactor, and one end of the voltage source loop is connected to a position between the first tank type fast switch and the second tank type fast switch.
Optionally, the voltage source loop includes a first capacitor, a second capacitor, a first reactor, a second gap device, a second resistance-capacitance voltage divider, and a second magnetic potentiometer.
According to the technical scheme, the test loop for the short-circuit current limiting test of the high-coupling split reactor type current limiter comprises a current source loop and a voltage source loop. One end of the current source loop is connected with one end of a current limiter to be verified, and the other end of the current source loop is connected with the other end of the current limiter and grounded; one end of the voltage source loop is connected with a bridge arm of a high-coupling splitting reactor provided with a pot type quick switch in the current limiter, and the other end of the voltage source loop is connected with the other end of the current limiter and grounded. The test loop can meet the requirement of current limiting characteristic performance verification of the current limiter under laboratory conditions.
Meanwhile, the requirements of tests in different grades can be met very conveniently, the test voltage, the test current, the test duration and the like can be adjusted, the parameter adjustment is flexible and convenient, and the test equivalence is high. And the voltage source loop can directly apply recovery voltage to the tank type quick switch, does not influence the working time sequence of the current limiter, and can simultaneously check the on-off capacity of the tank type quick switch.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a high coupling split reactor type current limiter;
fig. 2 is a test loop of a short-circuit current limiting test of a high-coupling split reactor type current limiter according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example one
Fig. 2 is a test loop of a short-circuit current limiting test of a high-coupling split reactor type current limiter according to an embodiment of the present application.
As shown in fig. 2, the present embodiment provides a circuit including a current source circuit 100 and a voltage source circuit 200 respectively connected to a current limiter FCL to be verified. The current limiter comprises a high-coupling split reactor HCSR and further comprises two tank type quick switches, namely a first tank type quick switch TFS1 and a second tank type quick switch TFS2 which are connected in series respectively, and the two tank type quick switches are all arranged on one bridge arm of the high-coupling split reactor.
The split reactor is a reactor consisting of two groups of inductance coils which are coupled with each other. The high-coupling split reactor is a dry type hollow split reactor with a coupling coefficient not less than 0.8. The tank-type quick switch is a gas-insulated metal-enclosed switchgear which is applied to a high-voltage alternating-current fault current limiter, enables a high-coupling split reactor to be decoupled or coupled, realizes switching of a current limiter between a current limiting mode and a current flowing mode, takes gases such as SF6 and the like as insulating media, and can be switched on and off quickly.
The current source loop comprises a short-circuit generator G, a first protection circuit breaker GB1, a second protection circuit breaker GB2, a first closing switch MS1, a second closing switch MS2, a first regulating reactor L1, a second regulating reactor L2, a first operating switch MB1, a second operating switch MB2, a short-circuit transformer T, a first gap device GP1, a first resistance-capacitance voltage divider U1, a first magnetic potential meter I1 and an auxiliary switch AB.
The voltage source loop comprises a first capacitor Cs, a second capacitor Cd, a first reactor Ls, a second reactor L50, a second gap device GP2, a second resistive-capacitive voltage divider U2 and a second magnetic potentiometer I2.
The method is characterized in that an existing short-circuit generator G in a laboratory is used as a current source loop power supply, a single-phase test loop is adopted, one wire outlet end of the short-circuit generator G is sequentially connected with a first protection circuit breaker GB1, a first closing switch MS1, a first regulating reactor L1 and a first operating switch MB1 in series and is connected to one end of a primary side winding of a short-circuit transformer T, the other end of the primary winding of the short-circuit transformer T is connected with the other end of the short-circuit generator G in series through a second operating switch MB2, a second regulating reactor L2, a second closing switch MS2 and a second protection circuit breaker GB2, one wire outlet end of a secondary winding of the short-circuit transformer T is connected with one end of a fault current limiter through a capacitance-resistance voltage divider U1 and an auxiliary switch AB, and the other wire outlet end of the secondary winding of the short-circuit generator G is grounded after passing through a first magnetic potential meter I1. A first gap device GP1 is connected across the secondary winding of the short-circuiting transformer T.
The internal structure of the current limiter to be verified is that one end of one arm of the high-coupling splitting reactor HCSR is connected with the current source loop, and the other end of the high-coupling splitting reactor HCSR is connected with the first tank type quick switch TFS1 and the second tank type quick switch TFS2 in series and then grounded.
One end of a first capacitor Cs in a voltage source loop is connected to one end of a second tank type quick switch TFS2 through a second gap device GP2, a first reactor Ls, a second reactor Ls and a resistance-capacitance voltage divider U2, and the other end of the second tank type quick switch TFS2 is connected with the other end of the first capacitor Cs and grounded. A second capacitor Cd and a second reactor L50 are connected across the first capacitor Cs and the second gap device GP 2.
According to the technical scheme, the test loop for the short-circuit current limiting test of the high-coupling split reactor type current limiter comprises a current source loop and a voltage source loop. One end of the current source loop is connected with one end of a current limiter to be verified, and the other end of the current source loop is connected with the other end of the current limiter and grounded; one end of the voltage source loop is connected with a bridge arm of a high-coupling splitting reactor provided with a pot type quick switch in the current limiter, and the other end of the voltage source loop is connected with the other end of the current limiter and grounded. The test loop can meet the current limiting characteristic performance verification of the current limiter under the conditions of high voltage and large current.
Meanwhile, the requirements of tests in different grades can be met very conveniently, the test voltage, the test current, the test duration and the like can be adjusted, the parameter adjustment is flexible and convenient, and the test equivalence is high. And the voltage source loop can directly apply recovery voltage to the tank type quick switch, does not influence the working time sequence of the current limiter, and can simultaneously check the on-off capacity of the tank type quick switch.
The test loop adopts a synthesis test parallel current introduction method, wherein a short-circuit generator system is used as a current source system, an oscillation loop system is used as a voltage source system, and the voltage source system is put in hundreds of microseconds before the last half-wave zero point of the current of the pot-type quick switch for switching on and off the short-circuit current.
Two protection circuit breakers in the circuit are used for protecting the short-circuit generator and the test circuit equipment. And the closing switch is used for controlling the input of the test current. The regulating reactor is used for regulating the test current. The operation circuit breaker has the same function as the protection circuit breaker and is used for protecting the short-circuit generator and the test loop equipment.
The short-circuit transformer is a single-phase short-circuit transformer and provides required current source voltage. The first gap device is used to protect the current source loop. The first magnetic potentiometer is used for collecting current of the current source. The first resistance-capacitance voltage divider is used for collecting the voltage of the current source. The auxiliary switch is used for switching in and out of the current source. Cs, Cd, Ls and L50 are voltage source loop capacitors and inductors and are used for providing recovery voltage between fractures after the tank type fast switch is switched on and switched off. The second gap device is used for the input of the voltage source loop. The second magnetic potentiometer is used for collecting the current of the voltage source. The second resistance-capacitance voltage divider is used for collecting voltage of the voltage source.
The test loop can adopt the following test steps to carry out verification test on the current limiter:
step 1, preparation before test:
step 1.1, firstly, carrying out no-load characteristic test of the tank type rapid switch, recording mechanical characteristic data and stroke sensor curves under different operating conditions, and measuring the inductance value of the high coupling reactor;
step 1.2, wiring of a test loop is carried out, the current source test loop is connected with a prototype by adopting a hard aluminum pipe female (provided by a laboratory), and the voltage source test loop is connected with the prototype by adopting a bare copper stranded wire (provided by the laboratory);
step 2, the test implementation process:
step 2.1, checking expected parameters of a loop:
performing open-circuit debugging on a voltage source loop, reading and checking TRV parameters including a TRV peak value, a rising rate and a power frequency recovery voltage;
carrying out short circuit debugging on the voltage source loop, reading and checking di/dt and short circuit current frequency of the voltage source loop;
performing a single break test at about 50% of the current source voltage, reading and checking short circuit current, asymmetric level, arcing time, and voltage source loop independent action time;
step 2.2, carrying out formal tests:
all switch fractures in the auxiliary circuit breaker AB and a current limiter prototype are in a switching-on position before a test, a main capacitor group Cs of a voltage source is charged to a set value in advance, current source loop switches GB, MS and MB are switched on to connect a current loop, short-circuit current flows through two branches of the current limiter, and the current limiter is in a high coupling state and presents low impedance to the outside. The tank type fast switch in the current limiter is opened, the current of the branch is cut off at the expected current zero point, and the current is transferred to the other branch. At this time, the current limiter enters a current limiting state. Within hundreds of microseconds before the expected current zero point, the voltage loop is switched on, the tank type fast switch switches off the voltage loop current after one half wave of the voltage source current, and the TRV is applied to the two tank type circuit breakers.
Step 2.3, carrying out a post-test no-load test on the test sample after the test, comparing the post-test no-load test data with pre-test no-load test data, and measuring the inductance value of the high coupling reactor;
and 2.4, performing appearance inspection on the main components of the arc extinguishing chamber after the test article is disintegrated.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The technical solutions provided by the present application are introduced in detail, and specific examples are applied in the description to explain the principles and embodiments of the present application, and the descriptions of the above examples are only used to help understanding the method and the core ideas of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (5)
1. A test loop for a high coupling split reactor type current limiter comprising a current source loop and a voltage source loop, wherein:
one end of the current source loop is connected with one end of a current limiter to be verified, and the other end of the current source loop is connected with the other end of the current limiter and grounded;
one end of the voltage source loop is connected with a bridge arm of a high-coupling splitting reactor provided with a pot type quick switch in the current limiter, and the other end of the voltage source loop is connected with the other end of the current limiter and grounded.
2. The test loop of claim 1, wherein the current source loop comprises a short-circuit generator, a first protection circuit breaker, a second protection circuit breaker, a first closing switch, a second closing switch, a first regulating reactor, a second regulating reactor, a first operating switch, a second operating switch, a short-circuit transformer, a first gap device, a first resistive-capacitive voltage divider, and a first magnetic potentiometer.
3. The test loop of claim 2, wherein the current source loop further comprises an auxiliary switch.
4. The test loop of claim 1, wherein the current limiter comprises a high coupling split reactor having a first can fast switch and a second can fast switch connected in series on one leg of the high coupling split reactor, and wherein one end of the voltage source loop is connected at a location between the first can fast switch and the second can fast switch.
5. The test loop of claim 1, wherein the voltage source loop comprises a first capacitor, a second capacitor, a first reactor, a second gap device, a second resistive-capacitive voltage divider, and a second magnetic potentiometer.
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Address after: 510620, No. two, No. 2, Tianhe South Road, Guangzhou, Guangdong, Tianhe District Patentee after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Patentee after: Xi'an High Voltage Electrical Apparatus Research Institute Co., Ltd Address before: 510620, No. two, No. 2, Tianhe South Road, Guangzhou, Guangdong, Tianhe District Patentee before: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Patentee before: Xi'an High Voltage Electrical Apparatus Research Institute Co., Ltd |
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