CN2045902U - Phase sensitized short circuit protection feeding switch - Google Patents
Phase sensitized short circuit protection feeding switch Download PDFInfo
- Publication number
- CN2045902U CN2045902U CN 87216113 CN87216113U CN2045902U CN 2045902 U CN2045902 U CN 2045902U CN 87216113 CN87216113 CN 87216113 CN 87216113 U CN87216113 U CN 87216113U CN 2045902 U CN2045902 U CN 2045902U
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- CN
- China
- Prior art keywords
- short circuit
- phase
- switch
- voltage
- circuit protection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model discloses a phase sensitized short circuit protection feeding switch which is used for the mine low pressure AC power-supply network, comprising a voltage mutual inductor, an electric current mutual inductor, a phase sensitized rectifying bridge, a comparator and integration output circuit. The normal state and the short circuit fault state of the network is distinguished by the voltage signal phase outputted by the voltage mutual inductor and the electric current signal phase outputted by the electric current mutual inductor, to differentiate the starting of the motor from the short circuit current of the network, avoiding the malfunction when the motor is started; at the same time, the short circuit fault of the long distance is protected, and the setting value of the switch is largely reduced.
Description
The utility model is the phase sensitive short circuit protection feeding switch in a kind of mine low-voltage power supply networking.
At present, the short-circuit protection of feeding switch, though adopted advanced electronic protection circuit, function is poor, the misoperation in the time of can not avoiding squirrel cage motor to start; Can not protect remote short trouble; DKZB-400/1140 type vacuum feed switch as Xuzhou Coal Mine Machinery Factory's production; the operating current signal of getting is that direct current transformer from mains supply line obtains; so can not distinguish the meritorious deal in the electric current; also just can't distinguish short circuit current and starting current, bring difficulty for adjusting of short-circuit protection.The rated current of prior art is 400 peaces, and the minimum setting current of short-circuit protection is 1200 peaces, and this has just limited the distance of short-circuit protection, the misoperation in the time of can not avoiding squirrel-cage motor to start simultaneously.
The purpose of this utility model is to avoid existing above-mentioned shortcoming in the prior art, and proposes a kind of misoperation can prevent that squirrel-cage motor from starting the time, can protect the phase sensitive short circuit protection feeding switch of remote short circuit failure again.
Task of the present utility model realizes by following scheme, the voltage signal of voltage transformer output is added on the both positive and negative polarity of phase depending on rectification bridge, the current signal of current transformer output is added on the E end and the zero line of phase depending on rectification bridge, resistance in parallel and electric capacity between the F of phase depending on rectification bridge end and zero line, constitute the integration output loop, this integration output is added on the reverse input end of comparator, the series loop that the positive input of comparator is made up of potentiometer and resistance provides the signal of adjusting, and the output signal of comparator is added on the triode of carrying out in the loop and carries out relay.
The utility model compared with prior art has the following advantages:
1, the misoperation in the time of can avoiding big squirrel-cage electric motor starting, though because of starting current is big, the current signal that is transported in the comparator is an active current, so can not surpass setting value.
2, can protect remote short trouble effectively; because the operating current signal is the active current signal; this just can reduce setting value; though short circuit current is through transmission at a distance; make the short circuit current signal weakening; but this power factor approaches 1, so still can surpass setting value, makes the rapid disjunction of short circuit line.
3, use face width, setting range of the present utility model be 100 peaces to 1800 peaces, so, not only can be used as total feeding switch and use, also can be used in along separate routes and on the distributor point.
Accompanying drawing 1 is that master of the present utility model looks schematic diagram (no end cap state)
The 1st, the flame proof wiring chamber that feed cable, load cable are connected with switch bus 3 is linked to be an integral body with flameproof enclosure 2, and respectively there is an end cap top of wiring chamber and the side of shell; The 4th, vacuum circuit-breaker, the 6th, mains switch handgrip, control circuit power transformer and voltage transformer control switch 5; The 7th, test switch, whether be used for testing protection circuit normal; The 8th, current transformer, secondary coil are 500 circles, secondary parallel resistance R
H, the 9th, the card of assembling phase sensitive short circuit protection circuit element; the 10th, the stabilized voltage power supply plate; for the phase sensitive short circuit protection circuit provides 24 volts and 18 volts of stabilized voltage power supplys; the 11st, voltage transformer; voltage ratio is 660/110 volt; or 380/110 volt, the 12nd, power transformer, secondary output 27 volts and 18 volts, 24 volts, 145 volts alternating currents.
When feeding switch when electricity is sent at the networking; move handgrip 5, control switch 6 closures, power transformer provides 24 volts and 18 volts of stabilized voltage power supplys to the phase sensitive short circuit protection circuit; the secondary coil of voltage transformer 11 is exported 110 volts of alternating currents simultaneously, through the resistance R of compensation circuit
2, capacitor C
2Be added on both positive and negative polarity Q, the P end of phase depending on rectification bridge QL, current transformer 8 is got the current signal corresponding to the voltage transformer phase, anti-phase E end and the zero line that is added on the phase depending on rectification bridge, resistance R
1And capacitor C
1Be connected in parallel on the output of current transformer, use as bypass filtering.Load resistance R
3And capacitor C
3Be connected in parallel between the F end and zero line of phase depending on rectification bridge, constitute the integration output loop, its output is added on comparator IC
1Inverting input, voltage-stabiliser tube DW
1For the protection comparator adds, by resistance R
4, R
5, potentiometer W
1, W
2The signal of adjusting that the series loop of forming provides is through potentiometer W
1Movable end be added on the normal phase input end of comparator, potentiometer W
2Be to be signal and sign checking the calibration usefulness, the diode D of the output of comparator on the short circuit blocking circuit of adjusting
1, D
2With voltage-stabiliser tube DW
2Be added on triode BG
1Base stage, the collector electrode of triode connects the execution relay J
1
110 volts alternating currents of voltage transformer output, for just, Q point is in the half cycle of bearing at P point, then the AC signal exported of current transformer must the E point for just, zero line is to bear, at this moment current signal is through E point → EQ brachium pontis → Q point → R
2, C
2The secondary coil of → voltage transformer → P point → PF brachium pontis → F point → R
3, C
3→ current transformer 8 constitutes the loop.Current transformer signal and voltage transformer signal are after phase depending on rectification bridge QL modulation, and signal voltage is just at load resistance R
3, capacitor C
3Last generation, when signal greater than potentiometer W
1Movable end provides when adjusting signal, comparator output electronegative potential, D
1Get electronegative potential, promptly to triode BG
1Carry electronegative potential, BG gets electronegative potential to be ended, and carries out relay J
1Discharge, vacuum circuit-breaker disconnects.
When the Q point be just, the P point for negative half cycle in, then E point for bear, zero line is being for just, current signal is higher than the P point because of Q point current potential, brachium pontis EQ diode is in anti-phase bias voltage and ends, at this moment load resistance R
3Can not get current signal.
With the voltage transformer signal is benchmark, and the signal after the modulation of phase depending on rectification bridge is the half-wave DC signal, and can current signal arrive R by QL
3, depend on the signal polarity of voltage transformer.At R
3On the size of integrated signal magnitude of voltage depend on phase place and current amplitude between voltage and the electric current.When the current signal phase place lags behind the voltage signal phase place.Its load resistance R
3On the active current signal Icos α value that obtains just little, when electric current is consistent with voltage-phase, at R
3The current signal value of last acquisition approaches the main line actual current signal.
When the cable short circuit of networking, current signal phase place and voltage signal phase place reach unanimity, and the power factor of this moment approaches 1, at load resistance R
3On the current signal value maximum that obtains, this signal conveys is to comparator IC
1Afterwards, IC
1Then export electronegative potential.
When induction machine started, though starting current is very big, to lag behind the voltage signal phase place a lot of because of the current signal phase place, and the power factor of this moment is very low, at this moment R
3On also low, the comparator of the current signal that obtains get electronegative potential, output high potential, relay J
1Be failure to actuate.
Malfunction during for fear of electric motor starting can both effectively be protected the short dot at networking again, and overcurrent protection setting value of the present utility model draws by following formula:
∑IeCosα＋3Ime≤IZ≤ (I
(2) d)/1.5
IZ in the formula---switch short circuit protection and setting value.
∑ Ie---electric equipment in the power supply network (not comprising maximum one) rated current sum.
Ime---maximum motor load current value.
Cos α---the line weighting power factor is generally 0.7.
（2）
Id--distal-most end two-phase short-circuit current value.
Embodiment:
Total cable length is 904 meters a power supply network; the distal-most end cable length is 731 meters; total installation of generating capacity is 447 kilowatts; maximum motor power is 160 kilowatts; distal-most end line to line fault electric current is 1250 peaces, according to Ministry of Coal Industry's " safety regulations " regulation, is 1200 peaces by its setting value of prior art; greater than the line to line fault electric current of distal-most end, thereby be protected.
Setting value of the present utility model calculates as long as 800 peaces are pacified than adjusting of prior art little 450 according to following formula, and does not trip can also make electric motor starting the time.Because the signal code ∑ IeCos α+3Ime=200.9+480 when maximum motor starts
=680.9 peaces.
Claims (1)
1, a kind of phase sensitive short circuit protection feeding switch; mainly form, it is characterized in that the R of short-circuit protection by wiring chamber 1, shell 2, bus 3, vacuum circuit-breaker 4, voltage transformer switch 5, switch handgrip 6, test switch 7, current transformer 8, short-circuit protection 9, stabilized voltage power supply plate 10, voltage transformer 11 and power transformer 12
2C
2After the parallel connection, the Q of an end and phase depending on rectification bridge circuit QL end links, the secondary coil of another termination voltage transformer, the P end of another termination QL of voltage transformer secondary coil; C
1R
1After the parallel connection, the E of a termination current transformer and QL end, other end connecting to neutral; C
3R
3After the parallel connection, the F of termination QL end and comparator IC
1Inverting input, other end connecting to neutral; IC
1Normal phase input end meet R
4, R
5, W
1, W
2W in the series loop
1Movable end, IC
1Output termination D
1Negative electrode; D
1Anode meet R
12, D
2Anode, IC
4Normal phase input end, DW
2Negative electrode; DW
2Anode connect the base stage of BG, the emitter connecting to neutral of BG, collector electrode connects the execution relay J
1
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87216113 CN2045902U (en) | 1987-12-05 | 1987-12-05 | Phase sensitized short circuit protection feeding switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87216113 CN2045902U (en) | 1987-12-05 | 1987-12-05 | Phase sensitized short circuit protection feeding switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2045902U true CN2045902U (en) | 1989-10-11 |
Family
ID=4830115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87216113 Withdrawn CN2045902U (en) | 1987-12-05 | 1987-12-05 | Phase sensitized short circuit protection feeding switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2045902U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393575A (en) * | 2014-10-24 | 2015-03-04 | 上海山源电子科技股份有限公司 | Phase-sensitive protection method and system for coal mine low-voltage distribution protector |
| CN112653088A (en) * | 2020-12-17 | 2021-04-13 | 卡斯柯信号有限公司 | Transponder cable self-adaptive short-circuit protection method of ground electronic unit |
-
1987
- 1987-12-05 CN CN 87216113 patent/CN2045902U/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393575A (en) * | 2014-10-24 | 2015-03-04 | 上海山源电子科技股份有限公司 | Phase-sensitive protection method and system for coal mine low-voltage distribution protector |
| CN104393575B (en) * | 2014-10-24 | 2017-05-31 | 上海山源电子科技股份有限公司 | Phase-sensitive protection method and system for coal mine low-voltage distribution protector |
| CN112653088A (en) * | 2020-12-17 | 2021-04-13 | 卡斯柯信号有限公司 | Transponder cable self-adaptive short-circuit protection method of ground electronic unit |
| CN112653088B (en) * | 2020-12-17 | 2022-08-30 | 卡斯柯信号有限公司 | Transponder cable self-adaptive short-circuit protection method of ground electronic unit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| RN01 | Renewal of patent term | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |