water-cooled electric heating capacitor

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The electric heating capacitor is applicable to the induction heating electrical system with nominal voltage no more than 4kV and frequency of 50kHz to improve the power factor and loop characteristics.The capacitor is mainly composed of housing, connecting rod and core.Electric capacitors use roughened polypropylene film and high-performance liquid (excluding PCB) as composite media, high-purity aluminum thin foil as electrode plates, porcelain sleeve screws and cooling water pipes as lead out terminals, aluminum alloy plates as shell, and water cooling pipes inside. The appearance is mostly rectangular box structure.

Description

The CT35 series of electric heating capacitors is a power auxiliary device specifically designed for industrial induction heating equipment. Its primary functions are to enhance the operational efficiency of induction heating systems, minimize energy waste, improve the circuit's power factor, and ensure more stable equipment operation. These capacitors are predominantly utilized in industrial applications involving metal induction heating, melting, stirring, and casting. Internally, they feature high-purity aluminum foil and specialized film-liquid dielectric materials; the housing is constructed from aluminum alloy. The product line is available in two variants—water-cooled and self-cooled—and typically adopts a rectangular, box-like structural form.

Technical data and specifications
Reference standards	GB/T3984.1（IEC60110.1）
U_N/AC Voltage range U_N	0.37KV-4KV
Var power C_N	500~7500Kvar
Frequency range F_N	0.2~10Khz
tan δ Tanδ/Loss factor tanδ	≤0.0004 （,At 20℃, 50Hz）
Capacitance deviation	- 5%~+10%, the ratio of the maximum value to the minimum value of each equal group capacitance shall not be greater than 1.1
Insulation strength	Insulation strength: capacitor with terminal insulated from shell shall withstand 2.15UN minimum power frequency test voltage of 2000V for 10s between terminal and shell.
Overload	Overload: the capacitor can operate continuously at rated voltage and 1.15 times of rated current, and at 1.05 times of rated voltage, no more than 12 hours per 24 hours.

Part Number	U_N	Q_N	I_N	C_N		F_N	Size（mm）				Weight	Type
Part Number	KV	kvar	A	μF	grouping	kHz	L	W	h	H	kg	Type
AXCT350375S0500D1	0.375	500	1333	565.9	6	1	400	165	230	350	36	D
AXCT350375S0500C1	0.375	500	1333	226.4	6	2.5	337	127	230	350	23	C
AXCT350750S0360A1	0.75	360	480	101.9	2	1	337	127	180	270	18	A
AXCT350750S0500B1	0.75	500	666.7	56.59	4	2.5	337	127	180	270	18	B
AXCT350750S0560B1	0.75	560	746.7	39.61	4	4	337	127	180	270	18	B
AXCT350750S0640B1	0.75	640	853.3	22.64	4	8	337	127	180	270	18	B
AXCT350750S1000C1	0.75	1000	1333	282.9	6	1	350	165	230	350	28	C
AXCT350750S1000C2	0.75	1000	1333	282.9	6	1	350	165	200	300	25	C
AXCT350750S2000F1	0.75	2000	2667	565.9	10	1	440	207	300	390	48	F
AXCT350900S2000G1	0.9	2000	2222	196.5	6	2	350	165	175	350	30	G
AXCT350900S2000G2	0.9	2000	2222	65.5	6	6	350	165	175	210	18	G
AXCT350900S2000G3	0.9	2000	2222	39.3	6	10	350	165	175	350	30	G
AXCT351000S1000D1	1	1000	1000	318.3	6	0.5	400	165	230	350	36	D
AXCT351000S1000C1	1	1000	1000	159.2	6	1	350	165	200	300	25	C
AXCT351000S2000F1	1	2000	2000	636.7	10	0.5	440	207	300	390	47	F
AXCT351200S1000D1	1.2	1000	833.3	221	6	0.5	400	165	230	350	36	D
AXCT351200S1000C1	1.2	1000	833.3	110.5	6	1	350	165	200	300	25	C
AXCT351200S1000C1	1.2	1200	1000	189.5	6	0.7	350	165	230	350	28	C
AXCT351200S2000E1	1.2	2000	1667	442.1	8	0.5	440	207	300	390	47	E
AXCT351200S2000E2	1.2	2000	1667	221	8	1	400	165	230	350	36	E
AXCT351400S1000D1	1.4	1000	714.3	162.4	6	0.5	400	165	230	350	36	D
AXCT351400S2000E1	1.4	2000	1429	324.8	8	0.5	440	207	300	390	47	E
AXCT351500S2000G1	1.5	2000	1333	141.5	6	1	355	165	325	500	43	G
AXCT351500S3000I1	1.5	3000	2000	424.4	1	0.5	355	200	490	745	65	I
AXCT351600S2000C1	1.6	2000	1250	248.7	6	0.5	390	207	300	430	46	C
AXCT351600S3778I1	1.6	3778	2361	671.1	1	0.35	330	320	475	800	110	I
AXCT351700F2000H1	1.7	2000	1329	248.9	6	0.5	390	207	300	430	46	H
AXCT351700F3000H1	1.7	3000	1765	550.7	6	0.3	390	207	540	680	72	H
AXCT351800S3000E1	1.8	3000	1667	147.4	8	1	390	165	300	430	36	E
AXCT351800S3787I1	1.8	3787	2104	620.1	1	0.3	330	320	475	800	110	I
AXCT352000S1500G1	2	1500	750	119.4	6	0.5	330	200	680	300	51	G
AXCT352000S2000I1	2	2000	1000	159.2	1	0.5	330	200	400	520	45	I
AXCT352000S2000D1	2	2000	1000	79.6	6	1	400	165	230	350	36	D
AXCT352500S2000I1	2.5	2000	800	169.8	1	0.3	330	200	600	760	64	I
AXCT352500S2000C1	2.5	2000	800	169.8	6	0.3	330	200	600	920	77	C
AXCT352500S2000I2	2.5	2000	800	101.9	1	0.5	330	200	440	570	48	I
AXCT352500F3000H1	2.5	3000	1200	254.6	6	0.3	390	207	440	680	70	H
AXCT352500S4000J1	2.5	4000	1600	254.6	1	0.4	330	320	475	800	110	J
AXCT352900S2000I1	2.9	2000	689.6	126.2	1	0.3	330	200	600	760	63	I
AXCT352900S3000I1	2.9	3000	1034	189.2	1	0.3	330	200	600	920	80	I
AXCT353000S3000G1	3	3000	1000	106.1	6	0.5	330	200	100	780	64	G
AXCT353000S5400K1	3	5400	1800	318.3	1	0.3	560	207	570	820	116	K
AXCT353000S6000J1	3	6000	2000	212.2	1	0.5	330	290	100	78	91	J
AXCT353200S2000I1	3.2	2000	625	103.6	1	0.3	330	200	600	760	64	I
AXCT353200S3000I1	3.2	3000	937.5	155.4	1	0.3	330	200	600	920	80	I
AXCT353600S3000J1	3.6	6000	1667	254.6	1	0.5	330	320	475	800	110	J
AXCT353800S2000J1	3.8	2000	526.3	110.2	1	0.2	330	320	600	800	109	J
AXCT353800S3000I1	3.8	3000	789.5	110.2	1	0.3	330	200	600	920	80	I
AXCT354000S3000J1	4	3000	750	74.6	1	0.4	330	320	335	660	87	J
AXCT354000S3000J2	4	3000	750	59.7	1	0.5	330	320	235	560	75	J
AXCT354000S7500L1	4	7500	1875	186.5	2	0.4	390	330	515	840	138	L

The capacitor is mainly composed of housing, connecting rod and core.Electric capacitors use roughened polypropylene film and high-performance liquid (excluding PCB) as composite media, high-purity aluminum thin foil as electrode plates, porcelain sleeve screws and cooling water pipes as lead out terminals, aluminum alloy plates as shell, and water cooling pipes inside. The appearance is mostly rectangular box structure.

a. Indoor installation, with an altitude not exceeding 1000m;

b. The ambient air temperature in the installation and operation area shall not be higher than 50 ℃.

c. The installation site shall be free of violent mechanical vibration, harmful gas and vapor and explosive dust.

d.The inlet pressure of cooling water shall not exceed 0.4Mpa, the inlet water temperature shall not exceed 30 ℃, the cooling water flow shall not be less than 6L/min. The cooling water shall be soft water without impurities, and the PH value shall be 6 ～ 9

Capacitor with Qn ≤ 1000kvar, water flow ≥ 4L/min.

Capacitor with Qn ≥ 1000kvar, water flow=6L/min.

e. The residual voltage at the time of energization shall not exceed 10% of the rated voltage

f. The capacitor must be vertically installed (with the porcelain bushing facing upward). It is forbidden to move the capacitor with the porcelain bushing. The spacing between the capacitors shall be at least 20mm.

g. Soft rubber hose shall be used for connection between cooling water pipes of capacitor and connection between cooling water pipe and water source pipe. Cooling water pipes may be connected in series, but not more than three capacitors. The drain pipe shall not be covered, and shall be placed at a place where the water flows out easily, so as to check the water condition at any time.

1、 Key points for matching core electrical parameters

Selection of withstand voltage value: The rated voltage should be at least 1.2~1.5 times the actual working voltage, suitable for power grid fluctuation scenarios. The long-term operating voltage should not exceed 1.1 times the rated value to avoid accelerating insulation aging.

Capacity matching: It needs to be accurately matched with the LC oscillation circuit and equipment operating frequency. The allowable deviation for conventional scenarios is -5%~+10%, and the accuracy requirement for intermediate frequency resonance scenarios is increased to ± 0.1%~± 0.5% to prevent resonance imbalance from affecting output power.

Rated current margin: The selected product's rated current needs to cover the normal operating current of the circuit, with a margin of about 15% reserved to meet the long-term operation requirement of 1.15 times the rated current.

Frequency characteristic adaptation: Confirm that the operating frequency range of the capacitor matches the equipment. Conventional electric capacitors are suitable for the range of 100Hz~100kHz, and specialized models with low equivalent series resistance (ESR) should be selected for high-frequency scenarios.

2、 Key points for environmental adaptability selection

Temperature adaptation: Select models that can work normally at -25 ℃~70 ℃ for conventional industrial scenarios, and prioritize products with higher resistance to high temperatures for high-temperature conditions to avoid deterioration of medium performance.

Protection level adaptation: Choose models with good sealing and strong moisture and dust resistance in high humidity and dusty environments to prevent media from being damaged by moisture; Choose reinforced structural products that resist mechanical loosening for scenarios with severe vibrations.

Special working condition adaptation: For systems with a large number of harmonics, specialized anti harmonic electric capacitors with series reactors are required to avoid overcurrent damage caused by harmonic amplification.

3、 Key Points for Structural and Reliability Selection

Cooling method selection: Water cooled products are preferred for long-term high load operation scenarios, and the water cooling flow rate is confirmed to meet the requirements (≥ 4L/min for ≤ 1000kvar, ≥ 6L/min for ＞ 1000kvar); Self cooling products can be selected for low load intermittent operation scenarios.

Medium and structure selection: Priority should be given to models with metalized polypropylene film self-healing technology, which can quickly restore insulation in case of local breakdown and reduce the risk of failure.

Brand and reputation screening: Select brand products with mature market applications and good reputation, complete after-sales operation and maintenance support, and reduce maintenance costs for long-term use.