Detuned Harmonic Circuit Filter Reactor
Introduction
Power disturbance and harmonic distortion in electrical systems have proven to be fatal to equipment, cables, transformers, capacitor banks, etc. The situation has deteriorated further with the use of products such as variable speed drivers, soft starters, rectifiers, UPS, discharge lamp, etc. These devices will generate or increase the harmonic distortion and high frequency interference in the power system. These disturbances will cause overheating to cables, transformer and related equipment, etc.
Detuned Harmonic Circuit Filter Reactor is used for:
- filtering harmonics and high frequency disturbance
- reduce high inrush current (from parallel switching of capacitors & from power to capacitor banks and thus improves the operating source life span of the capacitor)
Filtering % p is the ratio of inductance to capacitance. It is not to be confused with the impedance or reactance of an inductor.
For a 50Hz system:
- p=7% = 189Hz is used where protection to capacitor and harmonics reduction is required
- p=6% = 204Hz is to be used where the system is rich in 5th harmonics and above
- p=13% = 139Hz is used where voltage distortion exceed permissible limit
Technical Data
Rated voltage
- up to 440V
Filtering factor (uk)
- 7%
Frequency of filter
- 189Hz
Tolerance of inductance
- +/-5%
Linearity of inductance
- 1.3In with +/-5%
Test voltage
- 3.0kV
Degree of protection
- IP 00
Winding material
- copper or aluminium
- polyester enamelled wire 180°C (Class H)
- fiberglass wire 180°C (Class H)
Reactor core
- 0.5mm high grade silicon steel from Japan & Korea
Varnish
- high grade high temperature polyester varnish
Insulation class
- class F or H
Ambient temperature
- max 40°C
Technical Data (p=7%)
1. The reactor is manufactured to withstand 125% capacitor current (l1) at its rated operating voltage.
2. Harmonic current handling capacity (for p=7.0% detuned reactor):
- l1 = 1.06 Ic (fundamental current)
- l3 = 0.04 x l1 (3rd harmonic)
- l5 = 0.31 x l1 (5th harmonic)
- l5 = 0.13 x l1 (7th harmonic)
- lth = 1.25 x l1
3. Inductance tolerance is manufactured to be less than ± 5%.
4. Reactor Linearity still within 95~105% of their nominal inductance at 150% rated current. This assured maximum filtering of distortion
even in the presence of severe harmonics and best absorption of surges.
5. Saturation of iron core: The reactor will not saturate (a drop of 10% of the nominal inductance at 175% of rated current).
6. Insulation-Class H 180°C. (Class F 155°C available upon request).
7. Operating Temperature: 120°C max. temperature rise at ambient temperature of 40°C. Thermostat 130°C (NC) is fitted to coil windings for over temperature protection.
8. Testing: insulation strength tested at 3kV @ 1 minute.
9. Noise level: below 55dB – reactor not hum at no harmonics condition.
Detuned Harmonic Circuit Filter Reactor 525V 50Hz 7%
Technical Specification