The RSTO‑500kW‑2R×6‑IP23 Braking Resistor Device for Well Drilling Platform is a high‑power braking resistor developed by Guangdong Ruisite Electric Co., Ltd. specifically for the frequency converter braking system of electric drives on well drilling platforms. Its rated resistance is 2Ω × 6 (at 20°C), rated power 500 kW, and maximum operating voltage DC 690 V.
The resistive element is made of stable nickel‑chromium alloy, and the insulation uses high‑performance, high‑temperature alumina ceramics, ensuring reliability and durability under extreme conditions. The unit is equipped with two T60‑No.5 axial flow fans (each 5 kW / 380 V / 50 Hz), mounted horizontally with independent forced‑air cooling. Cooling air enters from one side, passes through the axial fans and the resistor cells, and exits through the outlet.
The device is suitable for environments free of methane or other flammable/explosive gases, corrosive gases, gases that damage insulation, conductive dust, or combustible dust. It operates at altitudes up to 1000 m, ambient temperatures from –45°C to +50°C, and maximum relative humidity of 95%.
As a high‑heat‑generating device, proper daily operation and maintenance are directly related to service life and operational safety.
The ventilator must be turned on for 15 minutes before starting the device to expel any accumulated moisture or humidity. After the device stops, the ventilator must continue running for another 15 minutes to ensure the resistor is adequately cooled, preventing hot air from flowing back and damaging other electrical components.Never operate the braking resistor without the fans running.
- No flammable or explosive materials may be placed near the device.
- Avoid direct contact with resistors in the working state unless adequate safety protection is provided.
- The air outlet should not face pedestrian walkways to prevent injury from high‑temperature airflow.
- The device must have sufficient, unobstructed ventilation space, preferably in a separate enclosure.
- The salt‑mist filter must be inspected and cleaned monthly; replace the filter element immediately if clogging is found – otherwise the resistor strip may overheat and burn out.
- A comprehensive inspection and maintenance should be performed at least once a year, including internal dust cleaning, wiring checks, tightening of loose bolts, and inspection of resistors for damage.
- Regularly check terminal connections for looseness and cables for ageing or damage.
- Periodically use compressed air to clean the resistor frame and heat‑dissipating components.
During overhaul, remove the entire assembly and place it securely; separate the resistor cabinet from the fans. When disassembling the resistor cabinet, first remove all cover plates and connecting copper bars, then remove the mounting nuts for the resistor cells from top to bottom, extract the cells for cleaning and inspection, and replace any damaged parts. After maintenance, use a 1000 V megohmmeter to measure the insulation resistance between the resistor strip and ground (must be ≥ 50 MΩ), and perform a dielectric strength test at 4500 V / 50 Hz for one minute (no breakdown or flashover).
Q1: What is the purpose of the Braking Resistor Device for Well Drilling Platform?
A: When a motor driven by a frequency converter operates in regenerative braking mode (during deceleration or braking), the kinetic energy of the drive system is fed back to the DC link, causing the DC voltage to rise. The braking resistor dissipates this regenerative energy as heat, preventing DC‑bus over-voltage and protecting the converter and power semiconductors from damage.
Q2: What should I do if the temperature control system trips falsely?
A: Check whether the temperature switch is faulty and replace if necessary; also inspect the electrical wiring for issues. The device's temperature sensor is located on the resistor strip cover, with a set point of 280°C (±5%). When the resistor temperature reaches this value, the temperature switch activates and sends an alarm signal.
Q3: What factors affect the service life of the braking resistor?
A: The main factors are cooling conditions, ambient temperature, braking frequency, and power rating matching. If the rated power of the resistor is too low for the actual braking energy demand, the resistor will be chronically overloaded and overheat, significantly shortening its life. Poor ventilation is one of the primary causes of resistor burnout.
Q4: Why does the resistor temperature rise too quickly?
A: Common causes include: blocked air inlet or outlet (poor cooling), local short‑circuiting of the resistor strip (due to foreign matter or damaged ceramic parts), or fan failure / insufficient air pressure. First check the ventilation and cooling system, then inspect the resistor cells themselves.
Q5: How do I determine the correct resistance value?
A: A fundamental rule is that the current through the braking resistor must not exceed the maximum output capacity of the braking chopper. Too low a resistance causes excessive braking current, potentially damaging the chopper; too high a resistance results in insufficient braking torque and poor deceleration. The optimal resistance value should be selected by balancing braking torque requirements and system cost, while always staying within safe current limits.
Case 1: Frequency Conversion Braking Support for Port Container Gantry Cranes (Heavy-load High-frequency Braking Scenario)
A container terminal’s 16-ton gantry crane originally adopted split separate braking resistors. Heavy dust exposure in open-air environments caused resistor short-circuit shutdowns every month, with over 2 hours of downtime per repair severely hampering loading/unloading efficiency. After switching to this Ruisite integrated braking resistor unit:
Dual-fan enclosed air ducts with built-in dust compartments reduce dust accumulation by 70%, cutting maintenance frequency down to quarterly from monthly.
Passive alarm contacts connect to the terminal’s central control system to send early warnings for resistor short-circuits and overheating, eliminating unplanned sudden shutdowns entirely.
Standardized 10-pin connectors allow independent maintenance by on-site operation teams without professional electricians, cutting annual maintenance costs by 45%. Customer Feedback: The integrated partition cabinet design completely resolves dust-induced short-circuit pain points, and the alarm linkage function drastically reduces downtime losses.
Case 2: Wuhan Cross-river Oil & Gas Pipeline Horizontal Directional Drilling Construction Site Test Load
This project belongs to Sinopec Zhongyuan Oil Construction Engineering Co., Ltd., a pipeline crossing construction site in Wuhan. Large horizontal directional drilling rigs require long-hour continuous full-load load detection before crossing river construction. Discrete scattered load equipment was previously used on site, with obvious drawbacks: difficult transfer across temporary steel trestles, messy wiring, poor waterproof and heat dissipation performance in humid river-side environment. After deploying our integrated AC load bank, core advantages are as follows:
Integrated forklift hole and lifting lug structure, compact whole-machine design, convenient to transport through narrow temporary steel trestles on the waterside construction site;
Independent smoke detection interlock protection + multi-stage overvoltage/overcurrent auto-unload program, effectively adapting to unstable power supply of temporary construction power distribution cabinets in Wuhan riverfront wet areas, avoiding damage to expensive horizontal directional drilling host;
Built-in automatic data recording module, one-click export complete test reports, fully meet the acceptance data filing requirements of Sinopec pipeline engineering projects;
ABB contactors and Siemens PLC control core, strong anti-vibration performance, stable operation with ultra-low failure rate under frequent short-distance transfer and bumpy site conditions.
Customer feedback: The mobile integrated load bank perfectly matches our river-crossing horizontal directional drilling construction test demands in Wuhan. It can run stably under long-term full-load continuous test, greatly shorten test preparation time and improve pipeline construction progress.
Case 3: Light-load Matching for Automated Production Line Conveyors
Multiple inverters are densely arranged on automotive component assembly lines with limited on-site space. Split resistors create messy wiring and frequent connection faults. Core advantages of this integrated unit:
High integration with neat footprint; the 2700mm overall length enables unified wall-mounted arrangement.
Quick-disconnect 10-pin connectors eliminate extensive wiring work during equipment commissioning and replacement. Fault alarms feed uniformly into the production line PLC, automatically halting the line upon resistor abnormalities to prevent work piece collision and scrapping.
Ruisite Electric (now also operating under related brands) has been selected as a supporting component supplier by many frequency converter manufacturers in the Pearl River Delta region for applications such as inverter braking and energy dumping.Customers have reported long product life and low failure rates. The company has consistently received top tax‑credit ratings, and its products serve power grid auxiliaries, rail transit, new‑energy buses, shore power systems, power conversion equipment, and more.
1.High reliability Nickel‑chromium alloy resistive elements and high‑temperature alumina ceramic insulation ensure stable operation in extreme ambient temperatures from –45°C to +50°C.
2.Efficient cooling Independent forced‑air system with two 5 kW axial fans provides effective temperature control at high power levels.
3.Lifetime warranty The manufacturer offers lifelong after‑sales support and spare parts supply; within the warranty period, any quality‑related defects are repaired or replaced free of charge.
4.Well‑designed layout Horizontal mounting structure for easy operation and maintenance; available with fixed or adjustable resistance values per customer requirements.
The Braking Resistor Device for Well Drilling Platforms has achieved the following authoritative certifications and standards compliance verifications:
ISO 9001:2015 Quality Management System Certification – Our factory undergoes annual audits by an independent third-party agency; our quality management system covers the entire process, from design and manufacturing to after-sales service.
CE Marking – Complies with EU Low Voltage Directive (LVD) and Electromagnetic Compatibility (EMC) requirements, qualifying the product for entry into the EU market.
Type Test Reports – Every new product undergoes comprehensive type testing before mass production—including dielectric strength, temperature rise, and insulation resistance tests—with reports available to qualified customers upon request.
Before providing a quote, our application engineers thoroughly analyze your technical specifications, on-site operating conditions, and performance expectations. We then tailor a solution specifically for you and provide a clear, transparent, itemized quotation. No hidden fees, no rough estimates.
Once the order is confirmed, we organize production strictly according to your approved drawings. We conduct inspections throughout key manufacturing stages and provide regular progress updates to ensure on-time delivery. You are welcome to visit our factory for inspections at any time; we invite and welcome oversight from every customer.
Following delivery, we continue to provide comprehensive technical support, installation guidance, and troubleshooting assistance. We guarantee the supply of spare parts for all standard components and respond to technical inquiries within 24 hours on business days. Whether through remote guidance or on-site support, we are dedicated to ensuring your complete peace of mind.
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No. 13, North Shore Road, Huangjiang Town, Dongguan City, Guangdong Province, China
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