CN109655677B - Multifunctional test device, test method and manufacturing method of current-limiting reactor - Google Patents
Multifunctional test device, test method and manufacturing method of current-limiting reactor Download PDFInfo
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- CN109655677B CN109655677B CN201710934209.9A CN201710934209A CN109655677B CN 109655677 B CN109655677 B CN 109655677B CN 201710934209 A CN201710934209 A CN 201710934209A CN 109655677 B CN109655677 B CN 109655677B
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Abstract
The invention provides a multifunctional test device for a current-limiting reactor, which comprises first to fourth core columns which are sequentially arranged, wherein each core column is sleeved with an alternating current winding which is respectively a first to fourth alternating current winding, the outer sides of the second alternating current winding and the third alternating current winding are commonly sleeved with a direct current excitation winding, the direct current excitation winding is connected into a direct current loop of a test system, and the principle verification test of the current-limiting reactor in different coupling modes is simulated by changing the wiring mode of each alternating current winding. Accordingly, methods of testing and manufacturing the devices are provided. The multifunctional test device for the current-limiting reactor can be used for respectively carrying out test research on the current-limiting reactors in different coupling modes so as to verify the theoretical analysis feasibility of the current-limiting reactors.
Description
Technical Field
The invention relates to the technical field of electrical equipment test devices, in particular to a multifunctional test device for verifying different realization principles of a controllable saturation current-limiting reactor based on a magnetic saturation phenomenon, a test method of the device and a manufacturing method of the device.
Background
With the increase of the electric load of the power grid and the strengthening of the structure of the power grid in the bead triangle and long triangle areas, the problem of exceeding the short-circuit current of the 500kV power grid is increasingly serious. Firstly, the three-phase short-circuit current level of a part of areas approaches or even exceeds the breaking capacity of switch equipment, once a short-circuit accident exceeding the breaking capacity of a switch occurs, very serious consequences are caused, the system of the area is broken down, large-area power failure and other major accidents affecting national production are caused; secondly, the requirement on the short circuit bearing capacity of the transformer is not strict enough in the past, the short circuit bearing capacity of the transformer running in a network is generally low, and the situation that the transformer is damaged after short circuit often occurs; and thirdly, in order to reduce the short-circuit current and improve the short-circuit resistance of some transformers, the method of improving the short-circuit impedance is adopted, so that the cost of the transformers is greatly increased, the load loss of the transformers is increased, and the efficiency of the system for transmitting electric energy is reduced. Moreover, since the transformers for 500kV substations generally adopt autotransformers, the single-phase short-circuit current of some 500kV substations is higher than the three-phase short-circuit current.
In summary, the problem of the exceeding of the short-circuit current becomes a significant problem affecting the safe operation of the system, and becomes one of the leading factors which severely restrict the operation and development of large-scale power grids in China. In view of the foregoing problem of system short circuit, a power grid in a 500kV high load area in China urgently needs a power device which exhibits low impedance under normal working conditions and high impedance during short circuit, so that on one hand, transmission of electric energy is not affected under normal conditions, and on the other hand, short-circuit current can be limited during short circuit, thereby protecting the system safely and reliably.
In order to solve the problem of the short circuit of the system, the prior art proposes a controllable saturation current-limiting reactor based on the magnetic saturation phenomenon, in particular to a high-impedance transformation rate current-limiting reactor which presents low impedance in a normal state and presents high impedance in a short circuit state. However, at present, such current-limiting reactors are still in the development stage, and a prototype is required to be made to verify the principle of the current-limiting reactors.
According to the strength of the coupling relation between the excitation winding and the alternating current winding, the current-limiting reactors can be divided into a weak coupling type current-limiting reactor, a strong coupling type current-limiting reactor and an improved strong coupling current-limiting reactor, in order to verify the accuracy of the three principles, three different prototype machines are required to be correspondingly manufactured, and the feasibility of theoretical analysis is verified by means of experimental research, so that a large amount of cost is wasted, more space is occupied, more maintenance work is required, and the performances of different types of current-limiting reactors cannot be visually compared.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a multifunctional test device which can respectively carry out test research on current-limiting reactors with different coupling modes so as to verify the theoretical analysis feasibility of the current-limiting reactors, a test method of the device and a manufacturing method of the device.
The technical scheme adopted for solving the technical problem of the invention is as follows:
the invention provides a multifunctional test device for a current-limiting reactor, which comprises first to fourth core columns which are sequentially arranged, wherein each core column is sleeved with an alternating current winding which is respectively a first to fourth alternating current winding, the outer sides of the second alternating current winding and the third alternating current winding are commonly sleeved with a direct current excitation winding, the direct current excitation winding is connected into a direct current loop of a test system, and the principle verification test of the current-limiting reactor in different coupling modes is simulated by changing the wiring mode of each alternating current winding.
Optionally, the current-limiting reactors of different coupling modes are a weak coupling current-limiting reactor, a strong coupling current-limiting reactor and an improved strong coupling current-limiting reactor.
Optionally, an upper iron yoke connected to one end of each of the first to fourth legs and a lower iron yoke connected to the other end of each of the first to fourth legs are further included, so that the test apparatus is formed in a single-phase four-leg core type structure.
The invention also provides a test method according to the test device, which comprises the following steps:
when a principle verification test of a weak coupling type current-limiting reactor is simulated, a direct current excitation winding is connected into a direct current loop of a test system, a second alternating current winding and a third alternating current winding are connected into an alternating current loop of the test system after being connected in series in a reverse direction, one end of a first alternating current winding and one end of a fourth alternating current winding are connected in series in a reverse direction, the other end of the first alternating current winding is grounded, and the other end of the fourth alternating current winding is open-circuited;
when a principle verification test of a strong coupling type current-limiting reactor is simulated, a direct current excitation winding is connected into a direct current loop of a test system, a first alternating current winding and a fourth alternating current winding are connected into an alternating current loop of the test system after being connected in series in a reverse direction, one end of a second alternating current winding and one end of a third alternating current winding are connected in series in a reverse direction, the other end of the second alternating current winding is grounded, and the other end of the third alternating current winding is open-circuited;
when the principle verification test of the improved strong coupling current-limiting reactor is simulated, the direct-current excitation winding is connected into a direct-current loop of the test system, the second alternating-current winding and the third alternating-current winding are connected into an alternating-current loop of the test system after being connected in series in the reverse direction, and the first alternating-current winding and the fourth alternating-current winding are connected into another direct-current loop of the test system after being connected in series in the same direction.
The invention also provides a manufacturing method of the multifunctional test device of the current-limiting reactor, which comprises the following steps:
manufacturing first to fourth stems and a lower yoke, and sequentially inserting one ends of the first to fourth stems on the lower yoke;
manufacturing four cylindrical alternating current windings and a runway-type direct current excitation winding, sequentially sleeving the four cylindrical alternating current windings on the four core posts, and sleeving the runway-type direct current excitation winding on the outer sides of alternating current windings on the second core post and the third core post;
inserting an upper yoke at the other ends of the first to fourth stems and performing fastening treatment;
leading out wires of the alternating current windings and the direct current excitation windings out so as to facilitate the subsequent test wiring.
Alternatively, when the four cylindrical ac windings are sequentially fitted over the four limbs, the ac windings are kept concentric with the corresponding limbs.
Optionally, when the racetrack-type dc excitation winding is sleeved outside the ac windings on the second and third mandrels, the dc excitation winding should completely surround the ac windings on the second and third mandrels.
Has the advantages that:
the invention relates to a multifunctional test device for a current-limiting reactor, in particular to a multifunctional test device for verifying different realization principles of a controllable saturation current-limiting reactor based on a magnetic saturation phenomenon.
Drawings
Fig. 1 is a schematic structural diagram of a current-limiting reactor multifunctional test device provided in embodiment 1 of the present invention;
fig. 2 is a flowchart of a testing method of the multifunctional testing apparatus for a current-limiting reactor according to embodiment 2 of the present invention;
fig. 3 is a schematic verification test wiring diagram of a weak coupling current-limiting reactor according to embodiment 2 of the present invention;
fig. 4 is a schematic verification test wiring diagram of a strong coupling current-limiting reactor provided in embodiment 2 of the present invention;
fig. 5 is a schematic verification test wiring diagram of the improved strong coupling current-limiting reactor provided in embodiment 2 of the present invention;
fig. 6 is a flowchart of a manufacturing method of the current-limiting reactor multifunctional testing device according to embodiment 3 of the present invention;
fig. 7 is a schematic view of the first to fourth stem pins inserted into the lower yoke according to embodiment 3 of the present invention;
fig. 8 is a schematic diagram of four ac windings and a dc excitation winding sleeved on corresponding core legs according to embodiment 3 of the present invention;
fig. 9 is a schematic view of the upper iron yoke and the first to fourth stem after being inserted into each other according to embodiment 3 of the present invention.
In the figure: 1-a first stem; 2-a second stem; 3-a third stem; 4-a fourth stem; 5. coil1 — first ac winding; 6. coil2 — second ac winding; 7. coil 3-third ac winding; 8. coil 4-fourth ac winding; 9. DCCoil-dc excitation winding; 10-upper yoke; 11-lower iron yoke.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention is further described in detail below with reference to the accompanying drawings and examples.
Example 1:
as shown in fig. 1, the present embodiment provides a current-limiting reactor multifunctional test apparatus, which includes a first stem 1, a second stem 2, a third stem 3, and a fourth stem 4, which are sequentially arranged, each stem is sleeved with an ac winding, which is respectively a first ac winding 5, a second ac winding 6, a third ac winding 7, and a fourth ac winding 8, and the outer sides of the second ac winding 6 and the third ac winding 7 are commonly sleeved with a dc excitation winding 9, the dc excitation winding 9 is connected to a dc loop of a test system, and a principle verification test of a current-limiting reactor in different coupling modes is simulated by changing the wiring mode of each ac winding.
The current-limiting reactors with different coupling modes can be a weak coupling type current-limiting reactor, a strong coupling type current-limiting reactor and an improved strong coupling current-limiting reactor. Moreover, the current limiting reactor is a controllable saturation current limiting reactor based on a magnetic saturation phenomenon.
Specifically, the connection mode of each ac winding should be determined by the coupling mode of the current limiting reactor, and those skilled in the art can set the connection mode of each ac winding according to actual conditions. For example, if the current-limiting reactor is a weak coupling current-limiting reactor, the second ac winding and the third ac winding are reversely connected in series and then connected to the ac loop of the test system, after one end of the first ac winding and one end of the fourth ac winding are reversely connected in series, the other end of the first ac winding is grounded, and the other end of the fourth ac winding is open-circuited; if the current-limiting reactor is a strong coupling current-limiting reactor, the first alternating current winding and the fourth alternating current winding are connected in series in an opposite direction and then connected into an alternating current loop of the test system, after one end of the second alternating current winding and one end of the third alternating current winding are connected in series in an opposite direction, the other end of the second alternating current winding is grounded, and the other end of the third alternating current winding is open-circuited; if the current-limiting reactor is an improved strong-coupling current-limiting reactor, the second alternating current winding and the third alternating current winding are connected in series in the reverse direction and then connected into an alternating current loop of the test system, and the first alternating current winding and the fourth alternating current winding are connected in series in the same direction and then connected into another direct current loop of the test system. The test system is an existing device and is provided with an alternating current loop and a direct current loop for testing.
The multifunctional testing apparatus may further include upper yokes 10 connected to one ends of the first to fourth stems, respectively, and lower yokes 11 connected to the other ends of the first to fourth stems, respectively, such that the testing apparatus is formed in a single-phase four-stem core type structure.
In this embodiment, by changing the connection mode of each ac winding, the excitation winding and the ac winding are changed, and the principle verification function of current-limiting reactors of different coupling modes, specifically, the principle verification function of a weak coupling type current-limiting reactor, a strong coupling type current-limiting reactor, and an improved strong coupling current-limiting reactor, can be realized only with one multifunctional test apparatus, so that experimental research can be performed on current-limiting reactors of different coupling modes to verify the theoretical analysis feasibility of the current-limiting reactors, the cost can be saved, the occupied space and the maintenance cost can be reduced, and the performances of different types of current-limiting reactors can be visually compared.
Example 2:
as shown in fig. 2, the present embodiment provides a testing method of the multifunctional testing device as described in embodiment 1, including the following steps S101 to S103.
S101, when a principle verification test of the weak coupling type current-limiting reactor is simulated, a direct current excitation winding DCcoil is connected into a direct current loop of a test system, a second alternating current winding Coil2 and a third alternating current winding Coil3 are connected into the alternating current loop of the test system after being connected in series in an opposite mode, one end of a first alternating current winding Coil1 and one end of a fourth alternating current winding Coil4 are connected in series in an opposite mode, the other end of the first alternating current winding Coil1 is grounded, the other end of the fourth alternating current winding Coil4 is open-circuited, and the wiring principle is shown in figure 3.
S102, when a principle verification test of the strong coupling type current-limiting reactor is simulated, the direct current excitation winding DCCoil is connected into a direct current loop of a test system, the first alternating current winding Coil1 and the fourth alternating current winding Coil4 are connected into an alternating current loop of the test system after being connected in series in an opposite mode, one end of the second alternating current winding Coil2 and one end of the third alternating current winding Coil3 are connected in series in an opposite mode, the other end of the second alternating current winding Coil2 is grounded, the other end of the third alternating current winding Coil3 is open-circuited, and the wiring principle is shown in FIG 4.
S103, during simulation of an improved strong-coupling current-limiting reactor principle verification test, a direct-current excitation winding DCcoil is connected into a direct-current loop of a test system, a second alternating-current winding Coil2 and a third alternating-current winding Coil3 are connected into the alternating-current loop of the test system after being connected in series in a reverse direction, a first alternating-current winding Coil1 and a fourth alternating-current winding Coil4 are connected into another direct-current loop of the test system after being connected in series in the same direction, and the wiring principle is as shown in FIG. 5.
In this embodiment, the principle verification of the current-limiting reactors of different coupling modes is realized by changing the wiring modes of the respective ac windings, and the principles of the weak coupling type current-limiting reactor, the strong coupling type current-limiting reactor, and the improved strong coupling current-limiting reactor can be verified.
Example 3:
as shown in fig. 6, the present embodiment provides a method for manufacturing a current-limiting reactor multifunctional test device, which includes the following steps S201 to S204.
S201, manufacturing a first core column 1, a second core column 2, a third core column 3, a fourth core column 4 and a lower iron yoke 11, and sequentially inserting one end of each of the first to fourth core columns 1-4 on the lower iron yoke 11, as shown in FIG. 7.
S202, manufacturing four cylindrical alternating current windings 5-8 and a runway type direct current excitation winding 9, sequentially sleeving the four cylindrical alternating current windings 5-8 on four core posts 1-4, and sleeving the runway type direct current excitation winding 9 on the outer sides of alternating current windings 6 and 7 on a second core post 2 and a third core post 3, as shown in fig. 8.
In this step, preferably, when the four cylindrical ac windings 5 to 8 are sequentially sleeved on the four core posts 1 to 4, each ac winding 5 to 8 should be kept concentric with the corresponding core post 1 to 4; when the runway-type dc excitation winding 9 is sleeved outside the ac windings 6 and 7 on the second and third mandrels 2 and 3, the dc excitation winding 9 should surround the ac windings 6 and 7 on the second and third mandrels 2 and 3 completely.
S203. the other ends of the first to fourth core legs 1 to 4 are inserted with the iron yoke 10 and fastened, as shown in fig. 9.
And S204, leading out wires of the alternating current windings 5-8 and the direct current excitation winding 9 out, finishing wrapping and fixing to facilitate subsequent test wiring.
The multifunctional test device for the current-limiting reactor manufactured by the manufacturing method of the embodiment enables the excitation winding and the alternating current winding to be changed by changing the wiring mode of each alternating current winding, and can realize the principle verification function of the current-limiting reactors in different coupling modes by only using one multifunctional test device, in particular to the principle verification function of a weak coupling type current-limiting reactor, a strong coupling type current-limiting reactor and an improved strong coupling current-limiting reactor, so that the test research can be carried out on the current-limiting reactors in different coupling modes to verify the theoretical analysis feasibility of the current-limiting reactors, the cost can be saved, the occupied space and the maintenance cost can be reduced, and the performances of different types of current-limiting reactors can be visually compared.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (6)
1. A multifunctional test device for a current-limiting reactor is characterized by comprising first to fourth core columns which are sequentially arranged, wherein each core column is sleeved with an alternating current winding which is respectively a first to fourth alternating current winding, the outer sides of the second alternating current winding and the third alternating current winding are commonly sleeved with a direct current excitation winding, the direct current excitation winding is connected to a direct current loop of a test system, and the principle verification test of the current-limiting reactor in different coupling modes is simulated by changing the wiring mode of each alternating current winding;
if the current-limiting reactor is a weak coupling current-limiting reactor, the second alternating current winding and the third alternating current winding are connected in series in an opposite direction and then connected into an alternating current loop of the test system, after one end of the first alternating current winding and one end of the fourth alternating current winding are connected in series in an opposite direction, the other end of the first alternating current winding is grounded, and the other end of the fourth alternating current winding is open-circuited;
if the current-limiting reactor is a strong coupling current-limiting reactor, the first alternating current winding and the fourth alternating current winding are connected in series in an opposite direction and then connected into an alternating current loop of the test system, after one end of the second alternating current winding and one end of the third alternating current winding are connected in series in an opposite direction, the other end of the second alternating current winding is grounded, and the other end of the third alternating current winding is open-circuited.
2. The testing device according to claim 1, further comprising upper iron yokes respectively connected to one ends of the first to fourth legs, and lower iron yokes respectively connected to the other ends of the first to fourth legs, so that the testing device is formed in a single-phase four-leg core type structure.
3. The testing method of a testing device according to claim 1, characterized by comprising the steps of:
when a principle verification test of a weak coupling type current-limiting reactor is simulated, a direct current excitation winding is connected into a direct current loop of a test system, a second alternating current winding and a third alternating current winding are connected into an alternating current loop of the test system after being connected in series in a reverse direction, one end of a first alternating current winding and one end of a fourth alternating current winding are connected in series in a reverse direction, the other end of the first alternating current winding is grounded, and the other end of the fourth alternating current winding is open-circuited;
when a principle verification test of a strong coupling type current-limiting reactor is simulated, a direct current excitation winding is connected into a direct current loop of a test system, a first alternating current winding and a fourth alternating current winding are connected into an alternating current loop of the test system after being connected in series in a reverse direction, one end of a second alternating current winding and one end of a third alternating current winding are connected in series in a reverse direction, the other end of the second alternating current winding is grounded, and the other end of the third alternating current winding is opened.
4. A manufacturing method of a multifunctional test device of a current-limiting reactor is characterized by comprising the following steps:
manufacturing first to fourth stems and a lower yoke, and sequentially inserting one ends of the first to fourth stems on the lower yoke;
manufacturing four cylindrical alternating current windings and a runway-type direct current excitation winding, sequentially sleeving the four cylindrical alternating current windings on four core posts to form first to fourth alternating current windings, and sleeving the runway-type direct current excitation winding on the outer sides of alternating current windings on a second core post and a third core post;
inserting an upper yoke at the other ends of the first to fourth stems and performing fastening treatment;
connecting the direct-current excitation winding into a direct-current loop of a test system;
if the current-limiting reactor is a weak coupling current-limiting reactor, the method further comprises:
connecting the second alternating current winding and the third alternating current winding in an alternating current loop of the test system after being connected in series in a reverse direction, connecting one end of the first alternating current winding and one end of the fourth alternating current winding in series in a reverse direction, then grounding the other end of the first alternating current winding, and opening the other end of the fourth alternating current winding;
if the current-limiting reactor is a strong coupling current-limiting reactor, the method further comprises:
and connecting the first alternating current winding and the fourth alternating current winding in an alternating current loop of the test system after being connected in series in an opposite direction, connecting one end of the second alternating current winding and one end of the third alternating current winding in series in an opposite direction, then grounding the other end of the second alternating current winding, and opening the other end of the third alternating current winding.
5. The method of claim 4, wherein the four cylindrical ac windings are sequentially fitted over the four legs while maintaining each of the ac windings concentric with the respective leg.
6. A method according to claim 4, wherein the racetrack DC field winding is fitted over the AC windings on the second and third mandrels so that the DC field winding surrounds all of the AC windings on the second and third mandrels.
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