核心参数与硬件规格

核心功能与技术特点

1. 母线稳压与储能：为变频器直流中间电路提供大容量储能，抑制电网波动与 IGBT 开关尖峰，稳定母线电压，降低电压纹波，保障功率模块可靠运行。
2. 能量缓冲与回馈：适配四象限运行，在电机制动或负载突变时吸收回馈能量，避免母线过压，支持能量双向流动，提升系统能效。
3. 低损耗与抗干扰：聚丙烯薄膜电容 + 低 ESR 设计，降低充放电损耗；低寄生电感母排抑制 IGBT 开关时的电压尖峰，保护功率器件。
4. 健康监测：部分版本支持基于 tanδ 值的电容老化预测，通过监测介损变化预警寿命衰减，便于预防性维护。

应用场景与适配系统

1. 核心应用：中压变频器直流链路，适配轧钢、船舶推进、矿井提升机、大型风机 / 水泵等大功率负载，尤其适合需要频繁启停、制动回馈的工况。
2. 适配系统：Converteam Megalink 系列中压变频器，兼容 GE Power Conversion 后续同平台升级型号，需与 IGBT 功率模块、整流 / 逆变单元协同工作。
3. 替代与兼容：可直接替换同系列老旧 DC-Link 模块，需匹配母线电压、容量与安装尺寸，替换后需校验电容均压与冷却适配性。

安装与维护要点

1. 安装规范
   • 适配 Megalink 标准机架，安装扭矩严格遵循 35Nm（M12 端子），避免接触不良引发发热。
   • 强制风冷通道需清洁无遮挡，风扇模块（P111-CF12）需与模块同步启停，定期检查风扇转速与滤网清洁度。
   • 模块间保持≥200mm 间距，避免电容放电时相互干扰，保障绝缘安全。
2. 维护与更换
   • 定期监测母线电压纹波、电容温度与漏电流，纹波超标或温度异常需排查电容性能。
   • 更换前必须对直流母线彻底放电（建议放电时间≥10 分钟，配放电电阻），防止触电。
   • 电容寿命通常 5-8 年（视工况），老化后介损增大、容量衰减，需及时更换同型号模块，避免系统故障。
3. 安全注意事项
   • 仅适用于 3000VDC 额定系统，严禁超压使用。
   • 故障时可能出现鼓包、漏液或异味，需立即停机检修，避免起火或爆炸风险。

与普通电容模块的差异

CONVERTEAM P111-6052 is a DC link capacitor module designed by Converteam (now part of GE Power Conversion) for the Megalink series medium voltage frequency converters. As the core energy storage and voltage stabilization component of high-power variable frequency drive systems, it is suitable for high inertia load scenarios such as rolling mills and ship propulsion, supports four quadrant energy feedback, and ensures the stability of the DC bus.

Core parameters and hardware specifications

Parameter details

Module type DC Link Capacitor module

Rated voltage 3000VDC

Capacitor capacity 8000 μ F (8mF) ± 5% (20 ° C)

Peak current 1200A (1 second)

Equivalent series resistance (ESR) ≤ 3m Ω (1kHz)

Parasitic inductance<15nH (multi-layer stacked busbar design)

Capacitor structure made of polypropylene film and aluminum foil, with low loss and high insulation

The cooling method is forced air cooling, which requires the P111-CF12 fan module to be matched

Terminal specification M12 bolt, installation torque 35Nm

Weight 18.5kg

Suitable frequency for medium voltage frequency converter IGBT switching frequency (typical 2-10kHz)

Core functions and technical features

Bus voltage stabilization and energy storage: provides large capacity energy storage for the DC intermediate circuit of the frequency converter, suppresses grid fluctuations and IGBT switch spikes, stabilizes bus voltage, reduces voltage ripple, and ensures reliable operation of the power module.

Energy buffering and feedback: Suitable for four quadrant operation, absorbing feedback energy during motor braking or load changes, avoiding bus overvoltage, supporting bidirectional energy flow, and improving system energy efficiency.

Low loss and anti-interference: Polypropylene film capacitor+low ESR design, reducing charge and discharge losses; Low parasitic inductance busbar suppresses voltage spikes during IGBT switching to protect power devices.

Health monitoring: Some versions support capacitor aging prediction based on tan δ value, which can detect changes in dielectric loss to warn of life decay and facilitate preventive maintenance.

Application scenarios and adaptation systems

Core application: Medium voltage frequency converter DC link, suitable for high-power loads such as steel rolling, ship propulsion, mine hoists, large fans/pumps, especially suitable for working conditions that require frequent start stop and brake feedback.

Adaptation system: Converteam Megalink series medium voltage frequency converter, compatible with GE Power Conversion and subsequent platform upgrade models, requires coordination with IGBT power modules and rectifier/inverter units.

Substitution and compatibility: It can directly ｒｅｐｌａｃｅ old DC Link modules of the same series, and needs to match the bus voltage, capacity, and installation size. After replacement, the compatibility of capacitor voltage equalization and cooling needs to be verified.

Key points for installation and maintenance

Installation specifications

Compatible with Megalink standard rack, installation torque strictly follows 35Nm (M12 terminal) to avoid poor contact and heat generation.

The forced air cooling channel needs to be clean and unobstructed, and the fan module (P111-CF12) needs to start and stop synchronously with the module. Regularly check the fan speed and filter cleanliness.

Maintain a spacing of ≥ 200mm between modules to avoid mutual interference during capacitor discharge and ensure insulation safety.

Maintenance and replacement

Regularly monitor the voltage ripple of the busbar, capacitor temperature, and leakage current. If the ripple exceeds the standard or the temperature is abnormal, the capacitor performance needs to be investigated.

Before replacement, the DC bus must be thoroughly discharged (recommended discharge time ≥ 10 minutes, equipped with discharge resistors) to prevent electric shock.

The lifespan of capacitors is usually 5-8 years (depending on operating conditions). After aging, the dielectric loss increases and the capacity decays. It is necessary to ｒｅｐｌａｃｅ modules of the same model in a timely manner to avoid system failures.

Safety precautions

Only applicable to 3000VDC rated systems, overpressure use is strictly prohibited.

When there is a malfunction, there may be bulging, leakage or odor, and the machine should be stopped immediately for maintenance to avoid the risk of fire or explosion.

Differences from ordinary capacitor modules

Comparison item P111-6052 DC link module ordinary industrial capacitor

Voltage level 3000VDC, high voltage adaptation mostly for low voltage (≤ 1000VDC)

Current carrying 1200A peak, suitable for high-power IGBT ≤ 500A, mostly used for auxiliary circuits

Parasitic parameters low inductance (<15nH), low ESR inductance/high ESR, weak anti-interference

Application scenario: Core link of medium voltage frequency converter, low voltage control circuit, filtering circuit