Energy consumption self-compensating reactor

Abstract

The utility model discloses an energy consumption self-compensating reactor which mainly comprises a reactor (1), an iron core (2), a secondary coil (3), an oil tank and shell (4), a radiator (5), a terminal strip (6) and a damping device (7). According to the principle of the energy consumption self-compensation reactor, magnetic energy generated and abandoned in the working process of the reactor is recycled and converted into electric energy again so as to compensate the loss of the reactor. The specific method comprises the steps that the reactor is regarded as and serves as a primary coil, an iron core and a secondary coil are arranged, waste magnetic energy of the reactor is collected through the iron core and converted into electric energy through the secondary coil to be merged into a power grid system, and therefore waste magnetic energy recycling and compensation of loss of the reactor are completed. Compared with the prior art, the utility model has the beneficial effects that the magnetic energy generated and abandoned in the working process of the reactor is recycled and converted into electric energy again so as to compensate the loss of the reactor, and the technical problem of magnetic energy loss in the field is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of reactors for power supply and distribution systems, and is applicable to reactors for AC 6kV-66kV power supply and distribution systems, and specifically relates to an energy self-compensating reactor which recovers magnetic energy generated and discarded by the reactor to compensate for its own energy consumption. Background Art

[0002] Overview of Reactor Applications and Problems

[0003] (1) Function and use

[0004] The function of the reactor is to limit current and filter, etc. The structural forms are divided into air-core reactors and iron-core reactors, and the parameter design is determined according to factors such as system impedance; the wiring method is divided into series and parallel according to the purpose and grid environment conditions. The series connection is used to limit short-circuit current and magnetizing inrush current, and is generally connected in series to the transformer circuit and capacitor circuit. The first function is to prevent the circuit breaker from exploding due to insufficient interruption capacity, the second is to prevent equipment such as transformers or generators from being damaged under huge current shocks, and the third is to prevent the magnetizing inrush current in the capacitor circuit from expanding accidents. Parallel wiring is mainly used for filtering, etc., and its function is to provide inductance components for the filtering device.

[0005] (2) Existing problems

[0006] The main problem with reactors is their high energy consumption. Since the essence of reactors is inductance coils, there is a problem of the reactor consuming a large amount of electrical energy under the action of alternating magnetic fields. The process of air-core reactors consuming electrical energy is to convert electrical energy into magnetic energy and release it into the atmosphere. During this period, a small amount of magnetic energy also acts on the self-inductance or mutual inductance of the coil, and then converts it into heat energy. As for the degree of harm to personal safety and the environment caused by the strong magnetic field released into the atmosphere, it does not belong to the research content of this technology and will not be discussed. The process of iron-core reactors consuming electrical energy is also to convert electrical energy into magnetic energy, but the magnetic energy does not diffuse into the atmosphere, but is sealed in a metal casing and consumed in a self-circulating manner in a closed iron core.

[0007] The energy consumption values ​​of various reactors are different, which are closely related to factors such as reactance rate and voltage. According to the data disclosed by multiple reactor manufacturers, taking 10kV, 35kV and 66kV reactors as examples:

[0008] The voltage level of a series reactor is 10kV, the rated current is 3000A, the reactance rate is 12%, and the loss is 56.52kW.

[0009] The voltage level of a certain shunt reactor is 35kV, the rated current is 742A, the rated reactance is 27.2Ω, and the loss is 59kW.

[0010] The voltage level of a certain shunt reactor is 66kV, the rated current is 525A, the rated reactance is 72.6Ω, and the loss is 70kW.

[0011] 2. Previous improvement methods

[0012] In order to solve the problem of reactor energy consumption, people have conducted a lot of research and exploration. Although there have been some improvements, the problem of power loss has not been completely solved, such as: ① Using copper materials with lower resistivity as conductors to reduce copper loss. At present, current limiting and filtering reactors are widely used. Although it can reduce losses, the reduction is too small, accounting for only about 0.3% of the total loss, which is not enough to solve a large amount of losses; ② Short-circuit reactor plus fast switch method. This method is mainly used for current limiting, specifically short-circuiting the reactor, and setting a fast switch in the short-circuit circuit. Under normal circumstances, it runs by short-circuiting the busbar to avoid the loss of the reactor. When a short circuit occurs in the distribution network, the switch quickly opens, allowing the short-circuit current to run completely through the reactor. After the accident is handled, the short-circuit circuit is restored. If a short circuit accident occurs again, repeat the above action process. Disadvantages: When a short circuit occurs in the distribution network, the short-circuit current completely passes through the reactor when the fast switch is opened, resulting in "cutoff" and "continuous flow", which causes the reactor to work in the state of short circuit and bus voltage reduction, and the bus voltage will be reduced again. In the mild case, the voltage of the entire distribution network will be greatly reduced, and the electric equipment such as motors will trip due to undervoltage (low-voltage motors and other equipment will trip due to low voltage), and the entire distribution network system will be shut down. In the severe case, the current quick-break protection of the switch on the low-voltage side of the main transformer will trip and power off. This type of expanded accident has occurred many times in domestic enterprises, causing heavy losses to production and operation; ③ Use high-impedance transformers to cancel current-limiting reactors. This method is to make the normal low-impedance and low-loss transformer coils into high-impedance and high-loss coils to achieve the purpose of limiting short-circuit current, but the high-impedance coils increase additional energy loss, which greatly increases the power loss on the basis of the original copper loss and iron loss, which is equivalent to transferring the energy consumed by the reactor to the transformer coil. Utility Model Content

[0013] In order to overcome the above-mentioned defects, the utility model provides an energy consumption self-compensating reactor, the principle of which is to recycle the magnetic energy generated and discarded during the operation of the reactor and convert it back into electrical energy to compensate for the loss of the reactor. Specifically, the reactor is regarded as and concurrently used as the primary coil, and an iron core and a secondary coil are configured at the same time. The iron core recycles the magnetic energy discarded by the reactor and converts it into electrical energy through the secondary coil and incorporates it into the power grid system, thereby completing the recycling of the discarded magnetic energy and compensating for the loss of the reactor.

[0014] The technical solution of the utility model is implemented as follows: the energy consumption self-compensating reactor is mainly composed of a reactor (1), an iron core (2), an auxiliary coil (3), an oil tank and shell (4), a radiator (5), a terminal block (6) and a damping device (7); the reactor (1) is a conventional reactor, and its role, function, parameters, etc. are all designed according to the conventional premise to meet the function of the reactor; the magnetic field energy density, magnetic induction intensity and other parameters of the iron core (2) are configured according to the total amount of magnetic energy generated and discarded by the reactor (1); the capacity of the auxiliary coil (3) is configured according to the total amount of magnetic energy generated and discarded by the reactor (1) converted into electric energy.

[0015] The lead-out terminals of the reactor (1) are A1, B1 and C1, and the lead-out terminals of the reactor (1) are A2, B2 and C2; the lead-out terminals of the auxiliary coil (3) are a1, b1 and c1, and the lead-out terminals of the auxiliary coil (3) are a0, b0 and c0;

[0016] When used for current limiting series connection, the lead-out terminal head ends a1, b1, c1 of the auxiliary coil (3) are respectively connected to the lead-out terminal tail ends A2, B2, C2 of the reactor (1), and the electric energy generated by the auxiliary coil (3) is incorporated into the system power grid. The lead-out terminal tail ends a0, b0, c0 of the auxiliary coil (3) are connected to the damping device (7).

[0017] When used for filtering and parallel wiring, the connecting terminal heads a1, b1, c1 of the auxiliary coil (3) are respectively connected to the lead-out terminal heads A1, B1, C1 of the reactor (1), so that the electric energy of the auxiliary coil (3) is connected to the system power supply side of the reactor (1), and the lead-out terminal tails a0, b0, c0 of the auxiliary coil (3) are connected to the damping device (7).

[0018] Furthermore, the reactor (1), the iron core (2) and the auxiliary coil (3) are placed in a sealed insulating oil tank (4) to reduce the probability of insulation breakdown.

[0019] Furthermore, a radiator (5) is installed on the oil tank-cum-housing (4).

[0020] Furthermore, a damping device (7) is added to solve the problem that the probability of ferromagnetic resonance may increase after adding the iron core, thereby eliminating problems such as resonance and high-frequency arc reignition overvoltage.

[0021] Compared with the prior art, the utility model has the beneficial effect of recycling the magnetic energy generated and discarded during the operation of the reactor and converting it back into electrical energy to compensate for the loss of the reactor. The reactor is regarded as and used as the primary coil, and an iron core and a secondary coil are configured at the same time. The iron core recycles the magnetic energy discarded by the reactor and converts it into electrical energy through the secondary coil and incorporates it into the power grid system, thereby completing the recycling of the discarded magnetic energy and compensating for the loss of the reactor, solving the technical problem of magnetic energy loss in this field. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is the primary main wiring schematic diagram of the energy consumption self-compensating reactor used for current limiting.

[0024] Figure 2 It is the primary main wiring schematic diagram of the energy consumption self-compensating reactor used for filtering in parallel wiring.

[0025] Figure 3 It is a schematic diagram of the structure of an energy consumption self-compensating reactor device. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] See also Figure 1-3The structure of the energy consumption self-compensating reactor is mainly composed of a reactor 1, an iron core 2, a secondary coil 3, an oil tank 4, a radiator 5, a terminal block 6 and a damping device 7. The reactor 1 is a conventional reactor, and its parameters such as voltage, current, and reactance are designed or limited according to the purpose. In the whole set of energy consumption self-compensating reactor, it is regarded as the original coil in order to recover the waste magnetic energy of the iron core 2, so that the secondary coil 3 can convert the waste magnetic energy into electrical energy and incorporate it into the power grid to compensate for energy consumption. The auxiliary coil 3 is a name based on the transformer principle. The actual wiring is completely different from the transformer auxiliary coil and other forms of auxiliary coils. It is a special wiring method for energy consumption self-compensating inductors. The configuration of the oil tank 4 and the radiator 5 is mainly based on factors such as enhanced equipment insulation. The inductor 1, the iron core 2, and the auxiliary coil 3 are placed in a sealed insulating oil tank to reduce the probability of insulation breakdown, and at the same time, it can also reduce the hazard of strong magnetic field diffusion to personal safety. The terminal block 6 has a total of 12 terminals. The design of the terminal block should focus on three aspects: one is the impact of large current impact during short circuit, the second is to prevent oil leakage, and the third is reasonable spacing for easy operation. The first end (system power supply side) is the first end of the reactor 1, which are A1, B1, C1 respectively, and the tail end (load side) terminals are A2, B2, C2 respectively; the first end terminals of the auxiliary coil 3 are a1, b1, c1, and the tail end terminals are a0, b0, c0 respectively, and c0 is the connection point of the damping device; the configuration of the damping device 7 is to consider that the probability of ferromagnetic resonance may increase after adding the iron core, so as to eliminate the problems of resonance and high-frequency arc reignition overvoltage. The applicable range of its resistance current to capacitance current is: I R :I C =1:5.67. If the power distribution system is small or the system is large but has been equipped with a device that effectively suppresses resonant overvoltage, it is not necessary to configure the damping device 7. Specifically, the relevant provisions of the current standard DL / T620-1997 "Overvoltage Protection and Insulation Coordination of AC Electrical Equipment" shall be followed.

[0028] When used for current limiting series connection, the primary main connection of the energy consumption self-compensating reactor adopts Figure 1 Way;

[0029] When used for current limiting series connection, the leading ends a1, b1, c1 of the auxiliary coil 3 lead-out terminals are respectively connected to the tail ends A2, B2, C2 of the reactor 1 lead-out terminals, and the electric energy generated by the auxiliary coil 3 is incorporated into the system power grid. The tail ends a0, b0, c0 of the auxiliary coil 3 lead-out terminals are connected to the damping device 7.

[0030] When used for filtering and parallel connection, the primary main connection of the energy consumption self-compensation reactor is adopted Figure 2 Way.

[0031] When used for filtering and parallel wiring, the first ends a1, b1, c1 of the auxiliary coil 3 connection terminals are respectively connected to the first ends A1, B1, C1 of the lead-out terminals of the reactor 1, so that the electric energy of the auxiliary coil 3 is incorporated into the system power supply side of the reactor 1, and the tail ends a0, b0, c0 of the lead-out terminals of the auxiliary coil 3 are connected to the damping device 7.

[0032] Example 1: The conventional design of a current limiting reactor has a voltage level of 10kV, a rated current of 3000A, a reactance rate of 12%, a short-time current of 50kA, a conventional dynamic stability current of 128kA, and a calculated loss of 56.16kW. Figure 1 When the wiring mode is used, the calculation of the conventional magnetic flux of the core 2 is determined according to the total amount of magnetic energy generated and discarded by the reactor 1, and the capacity of the auxiliary coil 3 is determined according to the total amount of magnetic energy generated and discarded by the reactor 1 converted into electrical energy. After implementation, the energy consumption is 7.07kW, and the copper loss and iron loss are 0.51kW; compared with the conventional design, the energy consumption is saved by 48.58kW, and the saving ratio is 86.5%.

[0033] Example 2: A shunt reactor is conventionally designed with a voltage level of 35 kV, a rated current of 742 A, a rated reactance of 27.2 Ω, and a loss of 58.61 kW. Figure 2 Wiring mode, the calculation of the conventional magnetic flux of the core 2 is determined by the total amount of magnetic energy generated and discarded by the reactor 1, and the capacity of the auxiliary coil 3 is determined by converting the total amount of magnetic energy generated and discarded by the reactor 1 into electrical energy. After implementation, the energy consumption is 8.14kW, and the copper loss and iron loss are 0.53kW; compared with the conventional design, the energy consumption is saved by 49.94kW, and the saving ratio is 85.21%.

[0034] Example 3: A shunt reactor is conventionally designed with a voltage level of 66 kV, a rated current of 525 A, a rated reactance of 72.6 Ω, and a loss of 70.89 kW. An energy consumption self-compensating reactor is used. Figure 2 Wiring mode, the calculation of the conventional magnetic flux of the core 2 is determined by the total amount of magnetic energy generated and discarded by the reactor 1, and the capacity of the auxiliary coil 3 is determined by converting the total amount of magnetic energy generated and discarded by the reactor 1 into electrical energy. After implementation, the energy consumption is 9.66kW, and the copper loss and iron loss are 0.64kW; compared with the conventional design, the energy consumption is saved by 60.59kW, and the saving ratio is 85.47%.

[0035] The calculations of magnetic field energy, magnetic induction intensity, magnetic field density, iron loss, copper loss, etc. in the above embodiments all comply with the relevant provisions of national standards.

[0036] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An energy consumption self-compensating reactor, mainly comprising a reactor (1), an iron core (2), a secondary coil (3), an oil tank (4), a radiator (5), a terminal block (6) and a damping device (7), characterized in that: The magnetic field energy density and magnetic induction intensity parameters of the iron core (2) are configured according to the total amount of magnetic energy generated and discarded by the reactor (1); the capacity of the secondary coil (3) is configured according to the total amount of magnetic energy generated and discarded by the reactor (1) converted into electrical energy; The lead-out terminal head ends of the reactor (1) are A1, B1 and C1, and the lead-out terminal tail ends of the reactor (1) are A2, B2 and C2; the lead-out terminal head ends of the auxiliary coil (3) are a1, b1 and c1, and the lead-out terminal tail ends of the auxiliary coil (3) are a0, b0 and c0; When used for current limiting series connection, the lead-out terminal head ends a1, b1, c1 of the auxiliary coil (3) are respectively connected to the lead-out terminal tail ends A2, B2, C2 of the reactor (1), so that the electric energy generated by the auxiliary coil (3) is incorporated into the system power grid, and the lead-out terminal tail ends a0, b0, c0 of the auxiliary coil (3) are connected to the damping device (7); When used for filtering parallel wiring, the connecting terminal head ends a1, b1, c1 of the auxiliary coil (3) are respectively connected to the lead terminal head ends A1, B1, C1 of the reactor (1), and the electric energy generated by the auxiliary coil (3) is connected to the system power supply side of the reactor (1), and the lead terminal tail ends a0, b0, c0 of the auxiliary coil (3) are connected to the damping device (7).

2. The energy consumption self-compensating reactor according to claim 1, characterized in that: The reactor (1), the iron core (2) and the secondary coil (3) are placed in a sealed insulating oil tank (4) to reduce the probability of insulation breakdown.

3. The energy loss self-compensating reactor according to claim 1, characterized in that: The ratio of the resistance current to the capacitance current of the damping device (7) is: I R :I C =1:5.67, to prevent resonant overvoltage in the networked system.

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