Table of Contents
Overview
The ZMTBBL series high-voltage filter reactive compensation device is used in 6~35kV power systems. It is mainly installed in power, steel, metallurgy, chemical, coal mine, light industry, building materials, and places where harmonic currents are generated. It functions to absorb harmonic currents generated by harmonic sources nearby, suppress harmonics, and eliminate “pollution” from power harmonics.The ZMTBBL device is connected in parallel with the harmonic source during operation. In addition to filtering, it also serves to provide reactive power to the system and improve the power factor for reactive power compensation.
Model Code and Meaning
- ZM: ZHIMING GROUP
- TBB: Shunt capacitor complete set
- L: Filter
- –: System voltage (kV)
- –: Rated capacity (kvar)
- –: Single unit capacity (kvar)
- –: Main wiring method
- A: Single star
- B: Double star
- [ ]: Relay protection method
- K: Open delta protection
- C: Voltage differential protection
- L: Unbalanced current protection
- Q: Bridge differential current protection
- Y: Unbalanced voltage protection
- W: Outdoor (户外) (Indicates indoor if absent/default)
Operating Environment Conditions
Installation environment: Outdoor or indoor.Altitude: No more than 1000 meters.Ambient temperature: -40℃～ +45℃.Relative humidity: Monthly average no greater than 85%.Anti-pollution ability: The creepage distance of external insulation is not less than 25mm/kV (relative to the system’s highest operating voltage). The creepage distance should be appropriately increased for heavily polluted areas.The installation site has no corrosive gases or vapors, and no conductive or explosive dust.The installation site has no severe mechanical vibration.Maximum wind speed does not exceed 35 m/s.Note: Products for high-altitude and special environmental conditions can be negotiated separately.
Executive Standards
GB 50227-2008 “Design Code for Shunt Capacitor Devices”JB/T7111-1993 “High Voltage Shunt Capacitor Banks”DL/T 604-1996 “Technical Ordering Conditions for High Voltage Shunt Capacitor Banks”
Main Technical Performance Indicators
The main technical performance indicators include capacitor deviation, inductor deviation, and insulation level.
Capacitor Deviation
- The difference between the actual capacitance of the device and the rated capacitance is within the range of 0 to +5% of the rated capacitance.
- The ratio of the maximum to the minimum capacitance between any two line terminals of the device does not exceed 1.02.
Inductor Deviation
- At the rated current, the allowable deviation of its reactance value is 0 to +5%.
- The reactance value of each phase does not exceed ±2% of the three-phase average.
Insulation Level
The insulation level of a power transformer refers to the withstand voltage value and is coordinated with the protection level and other insulation parts. It is expressed by listing the withstand voltage values in the order of high, medium, and low voltage windings (with the impulse level listed first), separated by a slash. The insulation level at the neutral point of graded insulation is added after its line terminal insulation level with a horizontal line.
Steady-State Overcurrent
The device can operate continuously under a root mean square (RMS) current value not exceeding 1.1 x 1.3 IN (where IN is the nominal current).
Maximum Allowable Capacity
Within the limits specified in sections 5.4.1 and 5.4.2, the total capacity should not exceed 1.35QN (where QN is the nominal capacity).
Discharge Performance
Within 5 seconds after power interruption, the voltage on each capacitor bank will be reduced to below 50V.
Filtering Efficiency
Filtering efficiency can reach above 85%.
Compensated Power Factor
The power factor can be improved to above 0.92 after compensation.
Rated Capacity and Outline Dimensions
Both the rated capacity and outline dimensions are determined according to user requirements.
