NB/T 10289-2019Technical specification of iron core filter reactor for high voltage reactive power compensation installation (English PDF)

3.1 Core filter reactor

A type of reactor with filtering function composed of iron core and windings. The iron core column contains a non-magnetic gap.

3.2 Rated voltage

The nominal voltage at which the high-voltage reactive power compensation device where the core filter reactor is connected to the power system.

3.3 Rated fundamental frequency

The fundamental frequency used when designing the reactor is generally 50 Hz.

3.4 Rated fundamental current

The root-mean-square value of the power frequency current used in the design of the reactor.

Note: Rewrite GB/T 1094.6-2011, definition 9.3.1.

3.5 Rated fundamental terminal voltage

When the reactor passes the rated fundamental current, the root mean square value of the power frequency voltage at both ends of a phase winding.

Note: [Rewrite JB/T 5346-2014, definition 3.2]

3.6 Rated harmonic current spectrum

The root-mean-square value of the continuous harmonic current at the specified frequency in addition to the power frequency when designing the reactor.

Note: GB/T 1094.6-2011, definition 9.3.2.

3.7 RSS current

The root and square value of the current at the specified frequency in the rated fundamental current and harmonic current spectrum.

Note: GB/T 1094.6-2011, definition 9.3.3.

3.8 Power frequency equivalent current

The root mean square value of the power frequency current obtained by calculation, the total loss of the reactor at this current is equal to the rated fundamental current and the rated The sum of current generation losses at the specified frequency in the harmonic current spectrum.

Note 1. Rewrite GB/T 1094.6-2011, the definition 9.3.4.

Note 2. The total loss includes winding loss and core loss. Refer to Appendix A for the calculation method of power frequency equivalent current based on loss and temperature rise.

3.9 Rated tuning frequency

The frequency of the harmonic current to be filtered generally depends on the loop formed by the reactor and the capacitor in series.

Note: According to filtering requirements, full tuning or partial tuning can be used. Full tuning means that the inductance and capacitive reactance of the loop are equal at this frequency. Partial tuning Mode means that the inductance and capacitive reactance of the loop deviate to a certain extent at this frequency.

3.10 Equivalent magnetic density

The calculated value of the core magnetic density under the superposition of power frequency and harmonic currents. The noise calculated by the reactor according to the magnetic density is equal to the current generated at each frequency The sum of noise.

Note: Refer to Appendix B for the calculation method of noise (A-weighted sound pressure level) based on equivalent magnetic density.

3.11 Rated fundamental capacity

Reactive power when operating at rated fundamental current.

3.12 Power frequency equivalent capacity

3.13 Rated inductance

The inductance value under the rated fundamental current used when designing the reactor.

3.14 Rated reactance

The inductance value when the reactor passes the rated fundamental current.

3.15 Quality factor

Refers to the ratio of the inductance of the reactor at the rated frequency to the effective resistance. The effective resistance can be the loss at the rated frequency and the reference temperature Export.

Note: Rewrite GB/T 1094.6-2011 and define 9.3.18.

3.16 Rated short-time current

The maximum short-term current within the specified time, the reactor is allowed to pass without causing abnormal heating and/or mechanical damage of the short-term current steady-state component Root mean square value.

3.17 Harmonic filtering ratio

Under a certain number of filtering times n, the ratio of the filtered n-th harmonic current content to the n-th harmonic current content flowing into the grid before filtering, Expressed as a percentage.

5.1 Normal use conditions

5.1.1 Altitude

The altitude of the installation site shall not be greater than 1000 m.

5.1.2 Temperature

The ambient temperature range is -40~55 °C. The lower limit temperature is recommended to be selected first from the following values. +5 °C, -5 °C, -25 °C, -40 °C; dry-type reactors are generally installed indoors, and the lower limit temperature can be -5 or -25 °C; oil-immersed reactors are generally installed outdoors, The lower limit temperature can be -40 or -25 °C. The upper limit temperature is the highest value of ambient air temperature at which the reactor can be put into continuous operation, divided into 4 There are four temperature categories, namely A, B, C, and D, as shown in Table 1.

5.1.3 Earthquake

The intensity of the earthquake is that the horizontal acceleration is not more than 2 m/s², and the vertical acceleration is not more than 1.0 m/s².

5.1.4 Pollution level

The uniform creepage distance of the indoor reactor should not be less than 43.3 mm/kV, and the outdoor reactor should not be less than 53.7 mm/kV (corresponding to the system Highest phase voltage). For heavily polluted areas, the creepage distance should be appropriately increased.

5.1.5 Installation location

The installation position of the reactor can be selected on the power side or the neutral side.

5.2 Special conditions of use

Under normal conditions of use different from those specified in 5.1, the purchaser and the manufacturer shall negotiate and determine.

6.1 General requirements

When designing the system, the reactance of each filter branch should be determined according to the system voltage, harmonic level and reactive power demand of the planned installation site.

The tuning frequency, capacity and inductance of the reactor should also be considered after the reactor is put into operation.

The harmonic current of the public connection point should meet the requirements of GB/T 14549 or the purchaser's requirements.

When ordering, the purchaser shall propose the main performance requirements and system usage conditions to the manufacturer, including but not limited to. system nominal voltage, The rated parameters, harmonic current spectrum, rated inductance, three-phase or single-phase, and wiring method of the supporting capacitor bank should be mentioned when conditions are met.

Provides harmonic filtering rate, adjustable or non-adjustable, insulation level, insulation heat resistance level, sound level level, loss, temperature rise and quality factor requirements and many more.

6.2 Rating

6.2.1 Rated voltage

System nominal voltage. 6 kV, 10 kV, 20 kV, 35 kV, 66 kV.

6.2.2 Rated fundamental current and RSS current

The rated fundamental wave current of the reactor is equal to the rated fundamental wave current of the supporting capacitor bank.

The RSS current of the reactor is equal to the rated current of the supporting capacitor bank.

6.2.3 Rated harmonic current spectrum

According to the harmonic current spectrum provided by the purchaser, it is obtained through actual measurement or simulation calculation. It usually refers to the various components that may flow into the reactor loop. A frequency of current.

6.2.4 Rated tuning frequency and rated inductance

The rated tuning frequency should be determined based on the main harmonic currents in the harmonic current spectrum, generally single tuning. Usually, when determining the tuning After the frequency, determine the tuning method (full tuning or partial tuning) according to the filtering requirements, and calculate the inductance.

6.3 Structural requirements

6.3.1 General requirements

The confirmation of the overall dimensions of the reactor should comprehensively consider factors such as transportation, site and installation.

The fasteners of the lead wires of the reactor should be made of non-magnetic materials, and the strength of other fasteners should not be lower than 8.8.

The lead terminal should be compatible with the maximum long-term continuous current, and the opening size should meet the requirements of GB/T 5273.

The minimum air gap between the live part of the reactor bushing and the ground and other live bodies shall comply with GB/T 1094.3-2017 No. 16.2 Provisions.

When installing the reactor, measures to reduce vibration and noise should be adopted to prevent overall noise amplification.

In order to control noise, dry-type iron core filter reactors should be designed with flat or low height and large diameter.

The sealing performance of the oil-immersed reactor should be sufficient to ensure no leakage at the highest operating temperature. The performance of insulating oil should meet the corresponding standards Standard requirements. The attachments are complete and complete with good performance.

For large-capacity oil-immersed reactors, pressure relief valves and oil protection devices should be installed according to the requirements of GB/T 6451-2015. Oil temperature measuring device, etc.

For large-capacity dry-type reactors, such as power frequency equivalent capacity exceeding 1000 kvar, protection devices such as fans and temperature controllers should be added. And meet the requirements of GB/T 1094.11-2007.

6.3.2 Silicon steel sheet

Silicon steel sheets should be oriented steel with low loss and small hysteresis. Do not use silicon steel sheets with serious defects such as wave patterns. For dry Type iron-core filter reactor, the iron-core column is vacuum cast after the gap is compressed to ensure the full penetration of the insulating material and reduce vibration. outer The exposed core part should be impregnated or painted with insulating glue or epoxy resin for curing.

6.3.3 Winding

The winding design should make the initial voltage distribution caused by the shock wave as uniform as possible to suppress voltage oscillation and operating overvoltage, while ensuring Prove that the current of each wire is evenly distributed.

The inter-turn insulation performance should be considered based on the arithmetic sum of the fundamental wave and each harmonic voltage peak value.

6.3.4 Other

The selection of the magnetic density of the reactor is closely related to the magnitude of the given frequency and current. It is recommended to use the equivalent magnetic density to consider the noise in the design.

Whether it meets the requirements. The equivalent magnetic density should not be greater than the magnetic saturation point of the selected silicon steel sheet.

In order to avoid the actual error of the inductance and capacitance values, which may cause excessive deviation from the designed tuning frequency, reactors can be used when necessary Tap, tap switch, etc., adjust the inductance value on site to achieve the ideal filtering effect. Reactor tap and tap switch The setting should fully consider the ability to absorb harmonics and noise control.

6.4 Performance requirements

6.4.1 Insulation resistance

The insulation resistance of the winding to the core is not less than 2500 Mohm, and the insulation resistance of the clamp to the core is not less than 100 Mohm.

6.4.2 Insulation level

The requirements of reactor insulation level are shown in Table 2.

The inter-turn insulation of the reactor should withstand no less than 5 times the rated fundamental terminal voltage for 1 min without breakdown or flashover.

6.4.3 Winding DC resistance

Converted to the same temperature, compared with the factory value, the DC resistance change should not be greater than 2%, and the three-phase unbalance rate should not be greater than 2%.

6.4.4 Inductance value

Under the rated fundamental current, the allowable deviation between the inductance value and the rated inductance is 0~+3%.

Under RSS current, the difference between the inductance value and the actual measured value under the rated fundamental current should not exceed ±1%.

Under 1.8 times the RSS current, the difference between the inductance value and the measured value under the RSS current should not exceed -5%.

For a three-phase reactor group composed of three-phase reactors or single-phase reactors, the difference between the reactance value of each phase and the average value of the three-phase should not exceed ±2%.

6.4.5 Loss

Under the power frequency equivalent current, the loss value (the winding is converted to 75°C) should meet the requirements of Table 3, and the allowable deviation should not exceed 15%.

6.4.6 Temperature rise

It is carried out at 1.1 times the power frequency equivalent current. For oil-immersed reactors, the temperature rise should not exceed the temperature rise limit in Table 4.for For dry-type reactors, the temperature rise should not exceed the temperature rise limit in Table 5. The temperature of core metal components and adjacent materials should not be dealt with Any part of the reactor causes damage.

6.4.7 Sound level

Under the rated fundamental current and harmonic current spectrum, the sound pressure level of the reactor does not exceed the specified value in Table 6.

6.4.8 Short-time withstand and peak withstand current performance

The reactor should have short-term current withstand capability and peak current withstand capability at rated fundamental frequency. Short-term current tolerance 25 times the rated fundamental current of 2 s. The peak withstand current should be negotiated between the manufacturer and the purchaser. The time is 0.5 s. The reactor should not be There are changes in electrical properties, displacement of silicon steel sheets, loose windings, and damage to appearance.

6.4.9 Quality factor

The quality factor of the reactor at the rated fundamental frequency is negotiated and determined by the purchaser and the manufacturer, and is generally not less than 60.

7.1 Test conditions

7.1.1 Test power supply conditions

The test power waveform should be approximately sine wave, and the amplitude difference between the positive half peak and the negative half peak should not be more than 2%.

The effective value ratio should be within sqrt2±0.05. The frequency of the industrial frequency power supply is (50±0.5) Hz, and the harmonic power supply should meet the requirements of GB/T 14549 begging.

7.1.2 Standard environmental conditions for the test

Ambient temperature. 5 °C~40 °C; Relative humidity. 45%~75%; Atmospheric pressure. 86 kPa~106 kPa.

7.1.3 High pressure test conditions

According to the provisions of GB/T 16927.1.

7.2 Test method

7.2.1 Visual inspection

Check the appearance and surface treatment of the reactor by visual inspection and using special measuring tools. The result should meet the requirements of 6.3.1.

7.2.2 Winding resistance measurement

Measure the DC resistance of the reactor, and record the temperature of the winding under test and the resistance between the winding terminals. Measuring cold resistance for temperature rise test At the time, the average temperature of the winding should be determined as accurately as possible. The measured value should meet the requirements of 6.4.3.

7.2.3 Inductance measurement

The inductance measurement should be performed under the rated fundamental current IN, RSS current and 1.8 times the RSS current. Three-phase reactors should use three-phase power, Take the average value of the three-phase current as the reference. The measurement results should meet the requirements of 6.4.4.

If the reactor is tapped or tapped, the inductance measurement should be performed on all gears. If the inductance of the reactor is continuously adjustable, The inductance measurement should be carried out in at least five positions, which should be evenly distributed within the adjustment range. Reactance with three-phase tap switch The detector should be measured in the same gear.

7.2.4 Loss measurement

The loss measurement should be performed under the power frequency equivalent current, and the temperature should be recorded during the measurement. The three-phase reactor is based on the average value of the three-phase current quasi. The loss value should be corrected to the reference temperature, and the resistance correction should be carried out according to the method of GB/T 1094.1, and the result should meet the requirements of 6.4.5 begging.

7.2.5 Insulation resistance measurement

The test method is in accordance with JB/T 501, using a 2 500 V or above megohmmeter, and the test winding and iron core, clamp and iron For dry-type reactors, the iron core should be grounded; for oil-immersed reactors, the iron core and the fuel tank should be grounded together. The measurement result should meet the requirements of 6.4.1.

7.2.6 Insulation test

7.2.6.1 Applied pressure test

The test is carried out in accordance with GB/T 311.1. The windings should be able to withstand the power frequency voltage specified in Table 2 relative to the ground and between phases for a duration of 1 min.

If there is no breakdown, flashover or damaging discharge during the test, the test is deemed to have passed.

7.2.6.2 Insulation test between winding turns

The winding-to-turn insulation adopts an induction withstand voltage test. The test voltage value is 5 times the rated fundamental wave terminal voltage. No breakdown or breakdown occurs during the test.

Flashover phenomenon. When the frequency of the test voltage is equal to or less than 2 times the rated frequency (50Hz), the test time under full voltage shall be 60s.

When the test frequency exceeds twice the rated frequency, the test time should be. 120×rated frequency/test frequency (s), but should not be less than 15s.

When the test conditions are not available, the lightning impulse voltage test can be used instead after negotiation and agreement between the manufacturer and the purchaser.

7.2.6.3 Lightning impulse test

The test is carried out in accordance with the provisions of GB/T 1094.3. In the dry state, apply a standard lightning shock wave with negative polarity (1.2 µ s±30%)/ (50 µ s ± 20%) three times, the voltage application method is shown in Table 7, and the test voltage is performed in accordance with Table 2. If the voltage recorded at full voltage and If there is no significant difference between the current transient waveform and the corresponding waveform recorded under reduced voltage, the insulation withstand voltage test is qualified.

When the lightning impulse voltage test is used for the insulation between winding turns, the two terminals should be performed alternately.

7.2.7 Partial discharge test

The partial discharge test is carried out in accordance with the relevant regulations of 11.3 in GB/T 1094.3-2017 and Article 22 in GB/T 1094.11-2007. The maximum partial discharge level is 10pC.

7.2.8 Sound level measurement