Capacitor compensation device
Isolation switch and pneumatic control system
The compensation device is used for inductive load compensation in excitation characteristics, load and temperature rise tests of power transformer and reactor. The device can adjust and change the voltage, capacity and compensation current of the capacitor bank by operating the pneumatic disconnector. The operation process is monitored, locked, prompted and alarmed automatically.
2 operation mode of control system
Operation mode of pneumatic switch: intelligent operation of disconnector, grounding maintenance operation of disconnector and single operation of disconnector.
2.1 intelligent operation of Disconnector
Intelligent operation when the intelligent operation elements are selected, all relevant pneumatic switches will be automatically operated, and the rated parameters of wiring mode will be provided.
2.1.1 intelligent operation elements
The connection mode is three-phase delta connection and three-phase Y connection.
2.1.2 cyclic switching
The operation time and times of capacitor switch must be recorded in the industrial computer database. According to the switching time and times of each capacitor, the input priority is calculated. The calculation priority function is provided by the buyer.
2.2 maintenance operation
In the maintenance operation state, except the switches listed below are in the off state, the other switches are in the closed state, and the display screen prompts to hang the grounding wire.
Composition of control system
3.1 design objectives and principles
The control system is designed in accordance with the principles of safe, stable and reliable operation system, advanced technology / easy to use, standardization and openness / scalability, and economic practicability.
The design of the control system follows the principle of safety and reliability first. The test electrical system, control system and protective access control system all provide interlocking signals, and the control software forms a complete safety interlocking control system according to these signals. All the pneumatic disconnectors are equipped with pneumatic switches to detect whether the opening and closing are in place, and the faulty pneumatic disconnectors are detected The key process parameters such as air pressure, current and voltage are equipped with high and low limit alarm and ultra-high and low limit emergency stop functions; the security level password is set to manage the operation authorization of operators at all levels; the operation safety of personnel and equipment are in line with the relevant national standards.
3.2 design specifications and standards
The design of the control system scheme follows the following standards:
Hg/t20507-2000 design regulations for automatic control instrument selection
Hg/t20512-2000 design regulations for instrument piping and wiring
Hg/t20513-2000 design regulations for instrument system grounding
Hg/t20508-2000 design regulations for control room
Hg/t20509-2000 design regulations for instrument power supply
Hg/t20573-95 code for engineering design of decentralized control system
Gb50093-2002 construction and acceptance of Automation Instrument Engineering
Gb50174-93 code for design of lightning protection of electronic computer
3.3 system structure
According to the requirements, the control system consists of manual control layer, local control layer and remote monitoring layer. Manual control layer is installed in the control cabinet, mainly in case of failure of local control layer and remote monitoring layer, so as to avoid delay of transformer test time. The local control layer is composed of X-Plane control cabinet according to the process requirements, including 1 set of PLC system, 1 group of remote i/o system, 1 local operation computer, X pneumatic solenoid valves, X pneumatic switches and other auxiliary devices, etc.; the remote monitoring layer is equipped with a system monitoring computer and UPS according to the functional design requirements. PLC system of local control layer and computer of remote monitoring layer are connected with each other through Siemens PROFIBUS-DP fieldbus.
The remote monitoring layer of the control system is equipped with a monitoring computer, which selects high-quality industrial control computer of China and is equipped with UPS UPS UPS UPS. The industrial control computer is equipped with CP5611 communication card, which is used to realize data communication with PLC system.
The local control layer of the control system is composed of one PLC system, one group of remote i/o system, pneumatic solenoid valve, pneumatic switch and so on. All control exit signals of PLC system are isolated by relay and output after expansion.
The industrial control computer system and console are installed in the main control room of the system. PLC, remote I / O, pneumatic system, control system and detection system are placed in the most convenient control cabinet away from the site. The side of the pneumatic cabinet is equipped with compressed air pressure filter (three piece set).
We are specialized in reactive compensation related products manufacturers, reactors, capacitors, transformers, cables and wires and other products. Our company, founded in 1998, has been one of the earliest manufacturers of reactive power compensation in China for more than 20 years.