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Hydraulic Control System of the Accumulator for Emergency Operation of High-Voltage Circuit Breakers
Published Time:
2024-12-30 13:06
Category:
Solution
Energy‑storage hydraulically controlled system with reliable energy monitoring
Emergency control high-pressure accumulator power source for valves
Emergency operation hydraulic control system for high-voltage circuit breakers
In high-voltage circuit breakers (such as hydraulic‑operated circuit breakers), When an emergency occurs—such as a complete loss of control power or failure of electric energy storage—an emergency opening (trip) is required. / When the circuit is closed, the high-pressure hydraulic fluid stored in the piston accumulator can deliver instantaneous power. During operation, safety procedures must be strictly followed, and hydraulic energy shall be released by manually opening the accumulator shut-off valve or activating the mechanical emergency decoupling device.
Emergency Operation Procedures
- Confirm Status : Check the accumulator pressure gauge to ensure that the oil pressure is within the rated operating range (with sufficient energy).
- Isolated power supply : Disconnect the control power supply and the motor power supply to prevent unintended operation.
- Open manual unloading / Open valve : Slowly open the emergency manual mechanical valve for tripping (or closing) on the hydraulic mechanism, using the high-pressure oil from the accumulator to actuate the main spool.
- Supervisory action Observe the circuit breaker’s mechanical position indicator to confirm that the contacts are fully open (tripped) or closed (closed).
- Close the valve : After completing the operation, promptly close the emergency handle or manual valve to prevent continued pressure relief in the system.
Safety Precautions
- High-pressure piston accumulators contain high-pressure nitrogen (typically on the order of tens of megapascals). Strictly prohibited Do not arbitrarily tighten or loosen the inflation valve plug.
- Non‑professional on‑duty personnel shall not perform mechanical emergency operations without authorization; such operations must be carried out using qualified insulating tools or dedicated operating handles.
- After emergency activation, the hydraulic system should be promptly inspected for faults (e.g., checking the power supply, the oil pump motor, or the microswitch).
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What are the causes of severe pressure drop and shortened service life in bladder-type accumulators?
What are the causes of severe pressure drop and short service life in bladder-type accumulators? The structure of a bladder-type accumulator is quite simple, consisting mainly of an oil chamber surrounding the bladder and a gas chamber equipped with a gas‑tight seal. During operation, the hydraulic fluid must be connected to the hydraulic circuit; when the system pressure rises, the fluid flows into the accumulator, compressing the gas until the pressure in the system pipeline stabilizes.
How can we reduce failures when an accumulator malfunctions?
If an accumulator malfunctions, its performance will be directly affected, potentially leading to abnormal pressures and system failure. Therefore, it should receive close attention during routine operation, and appropriate measures must be implemented to mitigate risks. So, how can we minimize failures when an accumulator malfunctions? The following sections address this issue.
Accumulators are intriguing components in hydraulic systems, analogous to capacitors in electrical circuits or springs in mechanical systems. As critical energy‑storage elements, they serve a variety of sophisticated functions, including hybrid‑power applications, shock absorption, pressure stabilization (and sometimes flow‑rate regulation), and the rapid release of stored energy to simulate impacts.
Is a bladder-type accumulator suitable for use in series with gas cylinders or cylinder banks?
1. Bladders typically have a shorter service life than piston‑type accumulators, and their quality varies significantly among different manufacturers. 2. Many factors can shorten a bladder’s lifespan and lead to rupture, including variations in the bladder’s intrinsic quality and durability; improper handling during assembly (e.g., failure to pre‑fill with fluid for lubrication); incorrect procedures during pre‑charging (e.g., insufficiently slow inflation); errors in calculating the pre‑charge pressure; oil‑port flow velocities approaching or exceeding 7 m/s; single‑stroke reciprocation times of 10 seconds or less when used for energy storage; collisions between the bladder and check valves during operation; large temperature fluctuations (including significant seasonal differences); prolonged lateral vibration; fluid‑induced corrosion; and inertial impacts from minute solid contaminants in the working medium, among others.
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