(product can with old change new)
A, purpose
LXQ II type, LXQ (D) II type disappears humorous resistor (fors short L II type resistor) ,are install style pressure transformer at 6~35kV electromagnetisms (for short press change) once rounds YO connection neutral point with nonlinearity resistor between field, rises damping and limit flow effect.
If 6~35kV, transformer station locality electrified wire netting neutral point not conductive earth, it mother online YO connection electromagnetism style press change once winding, becomes neutral point do not contact to earth electrified wire netting to field’s unique metal channel, so electrified wire netting looks earth capacity To fill, discharges approach, must by press change once windings, this kind of slow change process make press change iron core deeply saturate, so at electrified wire netting conductive earth disappearance time, will have press change once windings in appear number ampere worthy gush flow, will press change 0.5A high pressures melt wind of fuse, you adopts L II type resistor, this a kind of phenomenon will no longer take place.
If neutral point non-grounded 6~35kV, transformer station, empty carry or win the next round right compare little while after at generatrix, takes place phase-to-ground voltage not stability, you adopts L II type resistor, this a kind of phenomenon will greatly be abatement。L II type resistor’s electricity Resistance number can effective restrain press change iron core saturate cause iron magnet resonance.
>Because resistor is install at press change neutral point with between field, thats be press in change null sequence loop, do not affect meet at press change two time interphase line voltage measure sum electric energy computation, only links up at press change phase-to-ground voltage measure have little affections in null sequence loop, but phase voltage is as relatively insulation observation, this kind of little affects ordinary too is be able to accept.
L II type resistor have no porcelain cap, non-linear resistance body is as SIC give first place to want ingredient by high temperature hydrogen stove burn become, uses copper material or press cast aluminum connection between resistance body, cubage small, capacious, mechanical robustness high.
L II type proper augment 35kV electrified wire nettings use resistor’s Resistance number, makes zhi with 6~10kV electrified wire nettings use resistor have same limit flow with damping effect。And changeses to communicate parameter symbol resistor’s electric parameter。Work frequently 0.3mA (crest value) unders parameter reflect electrified wire netting normal running conditions under resistor on voltage and Resistance number, work frequently 3mA (crest value) unders parameter reflect electrified wire netting one-way contact to earth situation under resistor on voltage and Resistance number, communicates current easy acquire, conveniences consumer again measure.
Project | Technology target | ||||
LXQ II | LXQ (D) II | LXQ II | LXQ(D)II | ||
Resistor by AC0.3mA (crest value) current shi de voltage and Resistance number | U 0.3mAp (V, crest value) | 130±30 | 130±30 | 450±50 | 450±50 |
R 0.3mAp （kΩ） | ＞450 | ＞450 | ＞1800 | ＞1800 | |
Resistor by AC3mA (crest value) current shi de voltage and Resistance number | U 3mAp （V，峰值） | 500±100 | 500±100 | 1400±150 | 1400±150 |
R 3mAp （kΩ） | ＞180 | ＞180 | ＞550 | ＞550 | |
Whethers confine to power-frequency voltage both ends resistor | Do not confine to | Confine to 3kV (crest value) under | Do not confine to | Confine to 5kV (crest value) under | |
2 hour has been by 100mA [note] Current’s calorific capacity | 1. has not any obviously damage; | ||||
10min by 500mA current’s calorific capacity | 1. has not any obviously damage; | ||||
[Note] The current value of the thermal capacity test is the effective value
Three, adopts principle
Adopts L II resistor’s model besides with press change locality electrified wire netting rated voltage about outside, gives back with press change high-tension winding X hold (earth terminal) insulation class relevance 。 Our company according to many year experience, same voltage grade electrified wire netting executive resistor, because X hold insulation class different but divide into LXQ II type sum LXQ (D) II type .Everies X hold for all-insulation (with head ends same insulations) press change, be like JSJW- 6, 10 type, JDZJ- 6, 10 type, or X holds bushing execute voltage ≥ 10kV press change, be like JDJJ- 35 type, pleases adopt LXQ II type resistor 。 Everything X holds insulation work frequently endurance voltage compare low, 35kV presses change X hold work frequently endurance voltage for 5kV, 6-10kV presses change X hold work frequently endurance voltage for 3kV (GB 1207-1997" pressure transformer " 4.6.2 .2 earth clamps work frequently endurance voltage) ,please adopt LXQ (D) II type resistor 。 LXQ (D) II type resistor adopt segment change parameter measure, makes resistor section at normal operate current, still keeps inhere volt-ampere characteristic, effective field confine to gush flow sum damping press change resonance 。 Ases electrified wire netting take place abnormal big current (is like lightning stroke, electrified wire netting breaks line resonance) time, and associations in discharge gap part resistances side, makes resistor resistance change small, voltage no longer ascends, as avoids abnormal big current time damage press change X hold insulation.
Four, boundary dimension
L II type resistor noumenon for column structure . Boundary dimension sees picture one.
Five, installs means
L II type resistor’ s noumenon had to install at press change neutral point with field between . Is like picture 3, picture 4, picture 5 show.
If installation at presses change cupboard in, resistor noumenon with surrounding contacts to earth body distance suggestion ≥ 2cm 。 With presses change neutral point adopt insulate lead connection top resistor, lead shoulds have certain mechanical robustness, suggests conductor cross- section do not be less than 5mm 2. Common plumb installation, too can level installation.
