JP2770684B2 - Transformer equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission and distribution transformer device used in a substation or the like for suppressing noise generated between a plurality of transformer tanks due to transportation restrictions.

[0002]

2. Description of the Related Art FIG. 7 is a perspective view showing the structure of a conventional single-phase transformer for a substation, for example. In the figure, 1a, 1b
Are independent transformer tanks each containing a transformer element, which are divided according to size and weight restrictions during transportation.
Reference numerals 2 and 3 denote ducts through which connection leads (not shown) connecting the two transformer tanks 1a and 1b pass. Duct 2 has a diameter of, for example, about 1.5 m and a duct for a high voltage lead of 500 KV.
The duct 3 is, for example, a low-pressure lead duct having a diameter of about 1 m and 275 KV. 4 and 5 are bushings of high and low voltage terminals of a transformer connected to a substation switching facility, 6 is a heat exchanger of a cooler for radiating heat generated by copper loss or iron loss to the atmosphere, and 7 is heat A pump for circulating the cooling medium in the transformer of the exchanger 6, a fan 8 for supplying cooling air for the heat exchanger 6, a shield 9 for exciting noise generated by the transformer elements, This is a soundproof cover for reducing noise from the container, and is configured as an iron container that integrally surrounds the two transformer tanks 1a and 1b.

[0003] When no soundproofing measures are taken, the noise of the transformer depends on the insulation class and the capacity.
It is about 5 to 90 dB (A). This is as shown in the Japan Electrical Manufacturers' Association Standard (JEM-1118) as its standard value. In the high-voltage, large-capacity transformer for transmitting 500 KV shown in the above-mentioned conventional example, the noise of the transformer main body is often about 90 dB (A) when no soundproofing measures are taken. In addition to the transformer main body, there is also a noise generated by a fan motor excitation sound of a cooler and a wind noise of a fan, which is usually about 75 dB (A). On the other hand, the regulation value of substation boundary noise is set by regulation .
If is has, for example, of Tokyo, usually 65 even the most severe in the first-class area are a must to achieve the following night 45dB (A), also, of the mountainous region regional substations
The following demands have been made: dB (A). On the other hand, conventionally, the transformer main body is housed in a soundproof cover 9 made of iron for soundproofing of the main body, while a fan motor for driving the cooler fan has a low rotation speed, for example, about 400 rpm. Is used for soundproofing.

Next, the design of these soundproofing measures will be described. First, the design of the actual sound barrier is determined in consideration of the increase in sound pressure due to the reflection of sound inside the sound barrier and the leakage of sound from the openings provided in the sound barrier, but it will not be complicated. For this reason, these are ignored, and the structure of the basic soundproof wall is evaluated only by the sound transmission loss represented by the following equation (1). Equation 1 is described on page 71 of Vol. 33, No. 2, "Countermeasures for Substation Noise", Joint Research on Electricity. TLo = 20 log (ωm / 2ρc) (dB) (1) TLo: Transmission loss for normally incident wave (dB) ω: Angular velocity 2πf (HZ) m: Surface density of the wall (kg) / M ² ) ρ: air density (kg / m ³ ) c: sound velocity in air (m / sec) According to the above equation 1, the surface density m (kg / m ² ) of the soundproof wall is The larger the thickness, the greater the transmission loss. Therefore, if the same material is used, the thicker the material, and the same thickness, the higher the density, the higher the sound insulation effect. For example, when the noise of the transformer main body is 90 dB (A), and the thickness t (mm) of the iron plate soundproof wall necessary to make the transformer main body noise outside the sound insulating wall 57 dB (A) is obtained, Density 7.
9 × 10 ³ kg / m ³ , air density 1.293 kg / m
^3. TLo = 90-5, assuming a sound speed of 340 m / sec.
7 = 20 log ₁₀ (2π × 100HZ × 7.9t) /
(2 × 1.293 × 340), from which the thickness t of the iron plate soundproof wall is 7.9 (mm).

[0005] The noise of the fan of the cooler can be calculated by the following equation 2 according to the above-mentioned Electric Cooperative Research Vol. 33, No. 2, page 87.
Becomes SPL = SPL ₀ +70 log ₁₀ (D / D ₀ ) +50 log ₁₀ (N / N ₀ ) ... (2) SPL: Cooling fan noise (dB) SPL _0: Standard cooling fan noise (dB) D: · Cooling fan outer diameter (mm) D ₀ ··· Reference cooling fan outer diameter (mm) N ····· Rotation speed (rpm) N ₀ ··· Reference rotation speed (rp. m) For example, 75 dB noise at a standard rotation speed of 1000 rpm
When the number of rotations of the cooling fan of (A) is reduced to be equal to or less than 57 dB (A) by reducing the number of rotations without changing the shape of the fan, the following equation is obtained from Expression 2. 57 = 75 + 70 log ₁₀
(D ₀ / D ₀ ) +50 log ₁₀ (N / 1000), and the rotation speed N is 437 (r.p.m) or less. However, the cooling capacity of the cooler depends on Electric Joint Research No. 33.
According to Vol. 2, page 21, the fan speed is 0.6 to
In order to secure the required initial cooling capacity, if the number of coolers before taking soundproofing measures is assumed to be 3 per transformer element, the above proportional When the constant is calculated as 0.55 power, 3 units × 1
(437/1000) ^0.55 = 4.7 units, which ultimately requires 5 coolers per transformer element. That is, the number of coolers increases by taking soundproofing measures.

The soundproof wall and the cooler are designed as described above, and the combined noise value is obtained. The combined noise value is expressed by the following formula 3 according to the Electric Cooperative Research Vol. 33, No. 2, page 47. Become. L (SPL) = 10log ₁₀ (10 ^{L1 / 10} +10 ^{L2 / 10} ) (3) L ₁ ... Noise of sound source 1 (dB) L ₂ ... Noise of sound source 2 (dB) L (SPL) / Synthesized sound noise (dB) By substituting a numerical value into Equation 3, L (SPL) = 10log (1
0 ^57/10 +10 ^57/10 ) = 60 dB. This is a soundproof design of a transformer that has a margin of 5 dB (A) for the reflection of sound inside the soundproof wall, which was ignored in this calculation, and the noise increase due to sound leakage from the opening, compared to the substation boundary noise specification of 65 dB. Has been achieved.

On the other hand, when considering the radiation of noise from the transformer main body, as shown in FIG. 8, the radiation surface of the noise is A to E and A ₁ to A for the transformer tanks 1a and 1b, respectively.
There are five surfaces of E _1. In addition, two transformer tanks 1a, 1
The surfaces of the ducts 2 and 3 that connect between b are also radiation surfaces of noise. As shown in FIG. 9, this is a noise which is larger by the surface integral of the inner tank surfaces D and D ₁ and the connection ducts 2 and 3 as compared with the integral type transformer which is not bound by the transport restriction and is not separated into two transformer elements as shown in FIG. It becomes a radiation surface. Now, assuming that the radiant energy of noise per unit surface area of the transformer tank is constant, the transformer shown in FIG. 8 has the surface integration of the surfaces D, D ₁ , and the ducts 2 and 3 as compared with the transformer shown in FIG. Only the noise value is high. That is, assuming that the noise value generated on each surface of the transformer body shown in FIG. 8 is a value shown in Table 1 below, the noise generated by the transformer body is the sum of the noise generated on each surface. SPL = 10log
₁₀ (10 ^79/10 × 4 + 10 ^78/10 × 4 + 10 ^80/10 × 4)
= 90 dB (A).

[0008]

[Table 1]

[0009] However, among the generated noise of the transformer main body shown in FIG. 9 of Table 1, the inner side surface D, D _1, connecting duct 2,3
Since no surface noise is generated, the sum of the noise generated on each surface is
SPL = ₁₀ log ₁₀ (10 ^79/10 × 4 + 10 ^78/10
× 2 + 10 ^80/10 × 2) = 88.1 dB (A), which is 2 dB (A) lower than the transformer shown in FIG. The above equation 1 with this value, when obtaining a 57 dB (A) and composed such soundproof wall thickness t (mm) outside soundproof walls, TL ₀ = 88.
1-57 = 20 log ₁₀ (2π × 100HZ × 7.9
t) / (2 × 1.293 × 340), from which the soundproof wall thickness t is 6.3 (mm). Therefore, the above equation 1
The sound insulation wall thickness of the transformer shown in FIG.
In this case, it is necessary to reinforce the noise barrier by increasing the body noise by the difference between these two values. On the other hand, the thickness of the soundproof wall is 7.9 (m
m), the noise value outside the noise barrier is 88-TL ₀
= 88.1 -20 log ₁₀ (2π × 100HZ × 7.9
× 7.9) / (2 × 1.293 × 340) = 55.1 dB
(A), and the noise reduction condition on the cooler side can be relaxed. The above equation 3 is applied to the noise value L ₂ allowed on the cooler side, and L (SPL) = ₁₀ log ₁₀ (10 ^55/10 +
10 ^{L2 / 10} ) = 60 dB (A), L2 = 5
8.3 dB (A) will be allowed. Therefore, the number of rotations N of the cooling fan can be calculated as
8.3 = 75−70 log ₁₀ (D ₀ / D ₀ ) +50 l
og ₁₀ (N / 1000), from which N = 463
(R.p.m). Since the cooling capacity of the cooler is proportional to the fan speed to the 0.55th power, the allowable value of the speed is 43 in the case of the transformer shown in FIG.
7 (rp.m), (437/463) ^0.55
× 100 = 97%, which means that the cooling capacity is sacrificed.

[0010]

The conventional transformer arrangement is thus separated from the transport restrictions into two transformer elements,
Since this is configured to be connected by a connection duct, the noise radiating area of the transformer body increases, so that the soundproof wall is thickened to achieve the target value of soundproofing and the fan of the attached cooler There was a problem that the number of revolutions had to be reduced at the expense of cooling capacity.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a transformer device capable of suppressing radiation of noise generated between transformer tanks.

[0012]

SUMMARY OF THE INVENTION The transformers apparatus Ru engaged to the present invention, a plurality of transformers element is accommodated in independent tank, in the transformer apparatus tank is arranged within the noise insulation enclosure, adjacent Between the opposite side walls of the tank
Soundproof independent of the bar and independent from the installation part of each tank
A wall is provided, and the soundproof wall is provided between the opposed side walls and the tank is provided.
Seal along the front, ceiling and back of the
On the opposite side wall of the adjacent tank.
Between the installed and mounted damping springs and each of the above-mentioned damping springs.
And each of the above-mentioned tanks and a wire that is vibrationally insulated and isolated;
The space between the opposing side walls of each tank supported by the wire is
Seal along the front, ceiling and back of each tank
And a soundproof sheet containing lead fibers .

[0013]

According to the present invention, an adjacent tank of a transformer device is provided.
The soundproof wall and the soundproof sheet provided between the opposed side walls of
The front and ceiling surfaces of each tank are aligned between the opposite side walls of both tanks
Along the rear surface to suppress noise emission from this portion.

[0014]

[Embodiment 1] An embodiment of the present invention will be described below with reference to the drawings. FIG.
1 is a perspective view showing a structure of a transformer device according to Embodiment 1 of the present invention. In the figure, reference numerals 1a, 1b to 8 are the same as those of the conventional apparatus, and therefore the description is omitted. Reference numerals 10, 11, and 12 indicated by oblique lines in the drawing denote soundproof sheets that connect and seal three opposing surfaces of the two transformer tanks 1a and 1b, that is, front, ceiling, and rear ends. The soundproof sheets 10, 11, and 12 are made of a heavy sheet material having a large surface density including lead fibers and the like. FIG. 2 shows a support structure of the soundproof sheet 10 on the front portions of the transformer tanks 1a and 1b. Reference numeral 13 denotes a soundproof sheet 10 which is inserted into a cylindrical portion 10a provided at an end edge of the soundproof sheet 10 to curtain the soundproof sheet 10. a support wire for hanging on Jo, and both ends of the transformer tank 1a via the damping spring 14, the opposite sidewalls of 1b
It is stretched . Therefore, the supporting wire 13 maintains a sufficient tension for supporting the soundproof sheet 10 by the damping spring 14, and furthermore, the propagation of vibration from the transformer tanks 1a and 1b is suppressed. In addition, the soundproof sheet 12 of the back part is provided similarly. Fig. 3 shows a soundproof sheet 1 for the ceiling.
1 shows a support structure, in which a support wire 13 is inserted into a tubular portion 11a provided on a soundproof sheet 11 and the support wire 13 is And is stretched between the transformer tanks 1a and 1b. As shown in FIG. 4, a plurality of support wires 13 are provided at a required pitch in consideration of the dimensions, weight, and the like of each of the soundproof sheets 10, 11, and 12. Further, the soundproof sheet 11 on the front part and the back part is provided on the soundproof sheet 11 on the ceiling part.
A vertical edge 11b overlapping with 0 and 12 is provided to prevent noise from leaking from the boundary between the ceiling and the front. FIG. 5 shows the structure of the joint between the soundproof sheets 10, 11, 12 and the transformer tanks 1a, 1b. That is, a sound insulation plate 15 made of a damping steel plate or the like is provided on the outer side of the opposed inner surfaces of the transformer tanks 1a and 1b, and a magic tape 16 adhered on the sound insulation plate 15 is attached to the edges of the sound insulation sheets 10 and 11. The noise is prevented from leaking from the joints by tightly fixing them.

[0015] In the transformer configured as described above,
First, when the noise generated from the surfaces of the transformer tanks 1a and 1b sealed with the soundproof sheets 10, 11, and 12 is calculated, the noise generated from the inner side surfaces D and D ₁ and the connection ducts 2 and 3 in Table 1 is obtained. It is the sum of the noise. Here, when the sum is obtained using Expression 3, SPL = ₁₀ log ₁₀ (10 ^80/10 × 2 + 10
^78/10 × 2) = 85.1 dB (A). On the other hand, the effect of the soundproof sheet is as follows. When a soundproof sheet containing lead fiber and having a thickness of about 1 mm is applied, the surface density is about 5 kg / m ^2, and the transmission loss is obtained by using the equation 1, TLo = 20
log (2π × 100HZ × 5) / (2 × 1.293 ×
340) = 11 dB (A), and the transmitted sound from the soundproof sheet portion is 85.1 dB (A) −11 dB (A) = 74.
1 dB (A). From this, when the sum of the sound generated from the surface of the transformer tank other than the soundproof sheet portion and the transmitted sound from the soundproof sheet portion is calculated, SPL = ₁₀ log ₁₀ (10
^79/10 × 4 + 10 ^78/10 × 2 + 10 ^80/10 × 2 + 10
^{74.1 / 10} ) = 88.3 dB (A), which is almost equal to the noise generated by the main body of the integral transformer without considering the transport restrictions, and it is clear that the sound insulation effect has been sufficiently achieved. Each of the soundproof sheets 10, 11, and 12 is supported by a plurality of wires 13 stretched between the transformer tanks 1a and 1b via a damping spring 14, and connected and sealed between the ends of the tank surfaces. As a result, a more excellent noise radiation suppression effect is exhibited.

Embodiment 2 FIG. In the first embodiment, while indicating those containing lead fibers as soundproofing sheet, consisting of plate material Sheet steel such proof
A sound wall may be used. However, in this case, in order to avoid an increase in noise due to the reflection of sound inside the sealing, a sound-absorbing material 18 is superposed on the inner surface of the sound-insulating plate 17 as shown in FIG. Is required to be a self-supporting structure from the foundation to prevent propagation of vibration from the transformer tanks 1a and 1b.

Embodiment 3 FIG. In each of the above embodiments, the transformer tank is divided into two parts. However, the same effect can be obtained by applying the present invention to a transformer device divided into three or more parts.

[0018]

As is evident from the foregoing description, according to the inventions, is self-supporting between the side walls of adjacent <br/> tanks from the installation of the tank
Covered with sound barriers, i.e. sound insulation walls that are vibrationally insulated and isolated from the tank, and mounted on the opposite side walls of adjacent tanks, respectively.
Between the damping springs and the respective damping springs,
Wires that are isolated from each tank by vibration
Between the opposing side walls of the tanks.
Lead fibers that seal along the front, ceiling and back of
Sealing with a structure that includes a soundproof sheet that includes noise can suppress the radiation of noise that occurs between transformer tanks without sacrificing the soundproofing wall or the cooling capacity of the cooler A transformer device can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the structure of a transformer device according to Embodiment 1 of the present invention.

FIG. 2 is a perspective view showing a support structure of a soundproof sheet on front and back portions of the transformer tank shown in FIG.

FIG. 3 is a perspective view showing a support structure of a soundproof sheet on a ceiling portion of the transformer tank shown in FIG.

FIG. 4 is a perspective view showing a support structure of the entire soundproof sheet shown in FIG. 1;

FIG. 5 is a perspective view showing a structure of a joint portion between the soundproof sheet and the transformer tank according to the first embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a structure of a soundproof plate according to Embodiment 2 of the present invention.

FIG. 7 is a perspective view showing a structure of a conventional transformer device.

FIG. 8 is a perspective view showing a noise radiation surface in a transformer device in which a tank is divided.

FIG. 9 is a perspective view showing the structure of an integral transport type transformer device.

[Explanation of symbols]

 1a, 1b Transformer tank 2, 3 Duct 4, 5 Bushing part 6 Heat exchanger 7 Pump 8 Fan 9 Soundproof cover 10, 11, 12 Soundproof sheet 13 Supporting wire 14 Vibration suppression spring 15 Sound insulation plate 16 Magic tape 17 Sound insulation plate material 18 Sound absorbing material

Claims (2)

(57) [Claims] In a transformer device in which a plurality of transformer elements are respectively housed in independent tanks, and each of the tanks is juxtaposed in a soundproof cover, opposing side walls of adjacent tanks .
Separate from the soundproof cover between
A self-standing soundproof wall is provided between the opposite side wall.
Seal along the front, ceiling and back of the tank.
A transformer device characterized in that it is stopped . 2. In a transformer device in which a plurality of transformer elements are respectively housed in independent tanks, and each of the tanks is juxtaposed in a soundproof cover, opposing side walls of adjacent tanks .
Between the damping springs mounted on the
On the tank and vibrationally insulated from the tanks.
Ears and opposite side walls of each tank supported by the wire
Along the front, ceiling and back of each tank above
A transformer device comprising: a soundproof sheet containing lead fibers to be sealed .