Dynamic Reactive Compensation

The ZRTBBL high-voltage filtering reactive power device is used in the 6~35kV power system, mainly installed in power, steel, metallurgy, chemical, coal mining, light industry, building materials, and places where harmonic currents are generated. It plays a role in absorbing harmonic currents generated by harmonic sources nearby, suppressing harmonics, and eliminating power harmonic pollution. The ZRTBBL device operates in parallel with harmonic sources, serving not only as a filtering function but also as a means of providing reactive power to the system and improving power factor for reactive power compensation.

1. GB-50227-2008 Design Specification for Parallel Capacitor Devices

2. JBfT7111-199 "High Voltage Parallel Electric Sugar Fly"

3. DL/T "Technical Conditions for Ordering High Voltage Parallel Capacitor Tick Devices"

1. Installation environment: outdoor or indoor.

2. Altitude: not more than 1000 meters.

3. Ambient temperature: -40 ° C to +45 ° C

4. Relative humidity: monthly average is less than 85%.

5. Pollution resistance: creepage distance of external insulation shall not be less than 25mm/kV (relative to the highest operating voltage of the system). The heavy pollution area should be appropriately increased creepage Than the distance.

6. The installation site is free from corrosive gas, steam, electrical conductivity and explosive dust.

7. There is no severe mechanical vibration in the installation site.

8. Maximum wind speed shall not exceed 35 m/s. Note: products of plateau type and special environmental conditions can be negotiated separately.

1 Capacitance Deviation

The difference between the actual capacitor and the rated capacitor shall be within the range of 0~+5% of the rated capacitor.

The ratio between the maximum and minimum capacitance of any two circuit terminals of the device shall not exceed 1.02.

2. Inductance Deviation

At rated current, the allowable deviation of reactance value is 0~+5%.

The reactance of each phase shall not exceed ±2% of the mean value of the three phases.

3. Insulation Level

4. Negative ability

Steady state overvoltage

Steady state overcurrent: it can run for a long time under the mean square root value of less than 1.1×1.31N.

Maximum allowable capacity: The total capacity shall not exceed 1.35QN within the limits of 5.4.1 and 5.4.2.

5. Discharge performance: 5s after power-off, the voltage on each set of capacitors is less than 50V.

6. Filtering efficiency: up to 85%.

7. Power factor increased to more than 0.92 after compensation.

8. Rated capacity and dimensions: according to user requirements.

1. Structure

A single-tuned filter device or high-pass filter device is composed of a high-voltage isolating switch, a high-voltage vacuum contactor or a vacuum circuit breaker, a current transformer, a thousand type hollow wave-through reactor, a zinc oxide arrester, a filter capacitor, a high-voltage fuse, a discharge coil and a non-inductive resistor. Monotone harmonic device is mainly used to filter the main characteristics of the harmonic source nobo, such as 3 times, 5 times, 7 times, 11 times, etc.; The high-pass filter device mainly achieves the purpose of removing 13 or more high-order harmonics. ZRTBBL device is equipped with automatic switching control device and microcomputer protection device.

2. Working Principles

ZRTBBL filter device is mainly composed of filter capacitor, filter reactor and so on LC filter device, not only plays a filtering role, but also plays a reactive power compensation role. LC wave entering device mainly includes single tuned filter device, double tuned filter device, high pass filter device, C type filter device, etc. In practice, several groups of filtering devices are designed according to the distribution and size of harmonic current and reactive power demand. Each group of filtering devices is equivalent to a low impedance channel for the harmonic wave, so that most of the harmonic current flows into the filtering loop. The high-pass filter device presents low impedance to the harmonics above the cut-off frequency, while the C-type flow wave device has the characteristics of tuning wide band and low loss. The grouping of filter devices requires precise calculation, which not only filters out the main harmonic current, but also meets the requirements of reactive power compensation, and at the same time prevents the amplification of harmonic current due to parallel resonance between the filter device and the system impedance at a certain number of frequencies. The filter device design software of our company can provide accurate filter device design scheme quickly and reasonably through accurate simulation model according to the specific characteristics of each user.

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