Assessing noise and vibration mitigation in low-vibroacoustic shunt reactors

Figures & data

Figure 1. 3D geometric models of the (a) reactor and (b) tank.

Table 1. Main technical data related to POM-60000/525-У1.

Name	Technical specifications
Rated power, kVA	60,000
Rated voltage, kV	525/√3
Rated highest voltage, kV	550√3
Rated current, A	197.94
Rated total resistance, Ω	1531.6
Losses adjusted to an estimated temperature of 75°С	140
Connection scheme in the three-phase group	У0
Frequency, Hz	50
Number of phases	1
Type of cooling	ONAN
Neutral of winding	Grounded
Winding material	Copper
Oil grade (type)	Nytro Lyra X

Figure 2. (a) Dimensional parameters of the magnetic circuit and (b) 3D model of the reactor.

Table 2. Design sound pressure and power.

Mode designation	Sound pressure at 0.3 m (dB(A))	Sound pressure at 2.0 m (dB(A))	Sound power (dB(A))
Rated voltage	92.9	73.3	71.0
Max voltage	94.0	74.5	72.6

Table 3. Design characteristics and dimensions of the POM-60000/525-U1 reactor.

Part of the magnetic core			Cross-sectional area			Weight, kg
			Section	m^2	%
Rod		Rod 1	A–A	0.4148014	100
Side yoke	Vertical	Yoke 1	B–B	0.2693376	65
		Yoke 2	C–C	0.2693376	65
	Horizontal (outermost parts)	Yoke 3	D–D	0.2693376	65
		Yoke 4	E–E	0.2693376	65
Corners		L-type	–	–	–
		T-type	–	–	–	–
Magnet system						24,384

Figure 3. Saturation curve of the core material.

Figure 4. Installation of rubber gaskets on the 3D model of the reactor: (a) 1—between the packages of the magnetic system and (b) 2—between the beam and the yoke on the assembled reactor.

Figure 5. Grounding scheme of the magnetic system stacks.

Figure 6. Points at which the sound levels of the reactor are measured: A—high-voltage lead and X1, X2—grounded side.

Figure 7. Process of measuring the sound levels of the РОМ-60000/525-У1 reactor.

Table 4. Measured extraneous noise levels.

	Measured extraneous noise levels (background levels)
Measurement points	1	2	3	4	5	6	7	8	9	10	Average background noise (dB)
Before testing	39.3	38.6	38.9	39.3	39.4	38.8	38.4	38.5	38.5	38.6	38.8
After testing	38.6	38.4	39.0	39.5	39.3	38.9	38.1	38.6	38.6	38.6

Table 5. Measured sound levels.

Measured sound power (2 m distance) (dB)
Measurement points	At 1/2 height of the tank	At 2/3 height of the tank
1	68.5	68.5
2	72.3	72.5
3	70.2	70.6
4	66.5	66.6
5	68.5	68.8
6	68.7	68.7
7	65.3	65.5
8	67.4	66.6
9	68.8	68.8
10	61.7	61.9
11	68.5	68.7
12	68.2	68.4
Average measured $L_{a0,3}=$68.0 (dB)

Table 6. Comparison between the calculated noise characteristics of РОМ-60000/525-У1 and those of РОМБСМ-60000/500-У1.

Type of reactor	Average noise level $L_{a0.3}$ of the transformer (dB)	Average background noise level (dB)	Difference between the transformer noise and the background noise (dB)	Background noise level $\Delta L_{a0.3}$	Surface noise level $L_{A0.3}=L_{a0.3}-\Delta L_{a0.3}-K_{0.3}$ (dB)	Corrected sound power level $L_p=L_A+10\hspace{0.17em}·\hspace{0.17em}\mathrm{\text{log}}\hspace{0.17em}·\hspace{0.17em}\left(S_{0.3}\right)$ (dBА)
РОМ-60000/525-У1	68.0	38.8	29.2	0	60.96	82.2
РОМБСМ-60000/500-У1	69.0	54.0	15.0	0	67.0	88. 0

Figure 8. Process of measuring vibration displacements of the tank wall and the cooling system of РOM-60000/525-У1.

Figure 9. Points at which vibration displacements are measured on the tank wall (1–12) and the reactor cooling system (1–14).

Table 7. Measured vibration displacements of the tank wall.

Point №	1	2	3	4	5	6	7	8	9	10	11	12
Displacements (µm)	3.42	11.4	16.2	5.34	7.29	10.7	11.5	21.9	5.74	7.42	9.13	11.42

Note: The peak vibration displacement observed on the tank wall reached 21.9 µm (highlighted in bold), remaining within the acceptable limit of 30 µm as stipulated by IEC 60076-6-2014.

Table 8. Measured vibration displacements on the cooling system.

Point №	1	2	3	4	5	6	7	8	9	10	11	12	13	14
Displacements (µm)	5.14	7.19	12.15	12.03	10.33	7.38	6.15	4.85	8.19	8.64	8.62	11.35	7.10	5.35

Note: In the case of the cooling system, the maximum displacement recorded was 12.15 µm (highlighted in bold), well below the allowable threshold of 60 µm.

Figure 10. Vibration displacements (mm) of the tank walls at 100 Hz. (a) Calculation results and (b) 3D model of the tank.

Figure 11. Vibration displacements of the tank at a frequency of 100 Hz (mm) on the HV (‘−Z’) side. (a) Calculation results and (b) location of selected points 10–15.

Figure 12. Displacement plots (mm) in the frequency range of 50–150 Hz were obtained from (a) points 10–12 and (b) 13–15 along the z-axis.