CN2355485Y - Multifunctional three phase protection electronic switch - Google Patents
Multifunctional three phase protection electronic switch Download PDFInfo
- Publication number
- CN2355485Y CN2355485Y CN 98219172 CN98219172U CN2355485Y CN 2355485 Y CN2355485 Y CN 2355485Y CN 98219172 CN98219172 CN 98219172 CN 98219172 U CN98219172 U CN 98219172U CN 2355485 Y CN2355485 Y CN 2355485Y
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- CN
- China
- Prior art keywords
- circuit
- link
- comparator
- phase
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Abstract
The utility model relates to a multifunctional three phase protection electronic switch. A main circuit is used as a primary coil, and the coils BC < 1 >, BC < 2 >, BC < 3 >, BA < 1 >, BA < 2 > and BA < 3 > in an electric current and voltage transducer are used as a secondary coil. The induction voltage in the secondary coil is used for reflecting the size of the electric current in the main circuit and the three phase balancing situation, and the induction voltage in the coil of an electric current detector AH is used for reflecting the insulation state of the main circuit for the ground. The over current, the three phase imbalance and the insulation state for the ground of the main circuit are controlled through the reflected voltage to ensure the normal running of the main circuit. The switch has the advantages of quick movement, reliable sensing and small size, and is suitable for protecting various three phase alternate current electric apparatus devices or devices for current supply.
Description
The utility model relates to a kind of electric load protection switch, particularly a kind of multi-functional three-phase protective electronic switch.
Existing power on-load switch function ratio is more single, then only overcurrent fault is worked as the switch of being with thermal relay.These commercially available on-load switch structures are blocking, and volume is bigger, slow movement, and for example the thermal relay switch produces heat by electric current flow of metal is moved, and the metal fever distortion needs certain hour, so delay of response, reliability also just reduces.
The utility model purpose provides a kind of multi-functional three-phase protective electronic switch, and it has multiple functions such as open-phase protection, starting overcurrent protection, short-circuit protection simultaneously, and movement response is quick, the reliability height, and volume is less.
The utility model is realized by following technical scheme.This three-phase protective electronic switch comprises sample circuit I, comparison circuit II, instruction circuit III and executive circuit IV.1. sample circuit I comprises with three-phase main circuit A, B, C being the secondary coil BC of the series connection of primary coil
1, BC
2, BC
3, one end and common wire V
SSLink to each other, the other end links to each other with lead Vx; 2. comparison circuit II comprises filter rectification circuit and comparator A
4One end of filter rectification circuit links to each other with lead Vx, the other end and comparator A
4Negative input end link to each other comparator A
4Output and instruction circuit I II link to each other.By the series coil BC among the sample circuit I
1, BC
2, BC
3An end obtain the running current signal from main circuit A, B, C, and transfer voltage signal to, export comparison circuit II to, through the filter rectification circuit to comparator A
4Relatively,, then send signal and give instruction circuit III, the switch among the executive circuit IV is cut off main circuit as three-phase principal current imbalance.3. in sample circuit I, also comprise with main circuit A, B, C being the secondary coil BA of primary coil
1, BA
2, BA
3, these three coils and aforementioned coil BC
1, BC
2, BC3
GroupBecome current-to-voltage convertor LB, comprise LB
1, LB
2, LB
3Each secondary coil BA
1, BA
2, BA
3An end each with common wire V
SSLink to each other, each links to each other the other end with lead Va, Vb, Vc.4. in comparison circuit II, also comprise rectifying and wave-filtering circuit and comparator A
3, an end of rectifying and wave-filtering circuit links to each other with Va, Vb, Vc, the other end and comparator A
3Positive input terminal links to each other, and the output and instruction circuit I II of comparator A3 links to each other.Coil BA
1, BA
2, BA
3Middle voltage changes with electric current in the main circuit, delivers to the rectifying and wave-filtering circuit through lead Va, Vb, Vc and carries out rectifying and wave-filtering and deliver to comparator A
3Compare, when principal current is excessive, comparator A then
3Send signal, main circuit is cut off, carry out overcurrent protection through instruction circuit III, executive circuit IV.5. insulation against ground monitoring also comprises zero-sequence current detector AH, one end and common wire V in sample circuit I
SSLink to each other, the other end links to each other with lead AH ', and three-phase main circuit A, B, C pass from its centre bore.6. as Fig. 2, in comparison circuit II, also comprise the filter rectification circuit, amplifier A
1, comparator A
2, two end AH ' and the V of the input of filter rectification circuit and zero-sequence current detector AH
SSLink to each other, output is through amplifier A
1Positive input terminal link to each other amplifier A
1Output and comparator A
2Positive input terminal link to each other comparator A
2Output and instruction circuit I II link to each other.When main circuit A, B, C have normal current to pass through, AH ', V
SSHold non-inductive voltage output, when the load-side insulation against ground is reduced to security value (s), AH ', V
SSBetween will export induced voltage, through the rectifying and wave-filtering of rectifying and wave-filtering circuit, through amplifier A
1Amplify, voltage signal is delivered to comparator A
2Relatively, and to instruction circuit send signal so that insulation against ground is protected inadequately.
In sum, the utility model adopts the current/voltage conversion equipment, is primary coil with the power supply main circuit, with the coil BC in this transducer
1, BC
2, BC
3And BA
1, BA
2, BA
3Be secondary coil, reflect size of current and three-phase equilibrium situation in the main circuit with the induced voltage in the secondary coil, to control; Reflect that with induced voltage in the current detector AH coil main circuit insulation against ground state is also controlled, to keep the main circuit operation normal, its direct pick-up, be swift in motion, do not have lag, and sensing is reliable, and volume is little, the alternative existing air switch of safety, electric weight stopper, the time relay, current relay etc.The utility model is suitable for the usefulness of the protection of various three-phase alternating current apparatuses or electric supply installation.
Do concrete introduction with embodiment below.
Fig. 1 is sampling of the present utility model and executive circuit figure,
Fig. 2 is comparison of the present utility model and instruction circuit figure,
Fig. 3 is an outline drawing of the present utility model.
Code name among the figure:
A
1-A
4Four high guaily unit integrated circuit LM324 LB current-to-voltage convertor
AH zero-sequence current detector Ic time-base integrated circuit NE555
KA manual-automatic switch BA secondary coil
PC photoelectrical coupler ZW35 BC secondary coil
R
0-R
8Resistance BCR controllable silicon
W
1-W
3Adjustable resistance C
0-C
9Electric capacity
TVS transient voltage protector D
0-D
5Diode 4007
DW, DW
1Voltage stabilizing didoe ZCW series Dx
1, Dx
2, Dx
3Light-emitting diode
As Fig. 1, on main circuit A, the B of three-phase alternating-current motor M, C, be connected with sample circuit I and executive circuit IV, and the control circuit power supply is arranged, it is by diode D
0, capacitor C
0, C
1, resistance R
8With voltage stabilizing didoe DW
1The current rectifying and wave filtering circuit of forming, and by the exit V of control circuit
DD, V
SSIt is drawn.On main circuit A ', B ', C ', be connected with three centre path current electric pressure converter LB
1, LB
2, LB
3, LB wherein
1On comprise coil BA
1And BC
1, LB
2, LB
3Comprise BA
2, BC
2And BA
3, BC
3, described each coil is a primary coil with main circuit A ', B ', C ' all.7. instruction circuit I II comprises photoelectrical coupler PC and time-base circuit Ic in Fig. 2, by the input of photoelectrical coupler PC and each the comparator A among the comparison circuit II
2, A
3, A
4Output link to each other, the collector electrode of PC links to each other with the end points S of Ic, the end points 3 of Ic links to each other with executive circuit IV through lead St.8. executive circuit IV comprises controllable silicon BCR and coupled main circuit switch KA, the end points T of BCR
1Ic end points 3 in St and instruction circuit I II links to each other another end points T of BCR
2Link to each other with the three-phase main circuit.Pass three LB as electric current
1, LB
2, LB
3The time, secondary coil BC
1, BC
2, BC
3In will have alternating voltage to produce, through V
SS, Vx causes the rectifying and wave-filtering circuit II among Fig. 2
4, this circuit II
4Comprise capacitor C
8, C
9, resistance R
4, R
5, W
3, diode D
5, DW, behind rectifying and wave-filtering, deliver to comparator A
4Negative input end because phase difference is 120 °, V when normally moving
SSAnd be fixed value voltage between the Vx point, this voltage is higher than A
4Positive input terminal, so A
4No-output; When phase shortage, for example C cuts off the power supply mutually, and then corresponding electric current is iA=-iB, thus reduce at the induced voltage at secondary coil BC place zero, A at this moment
4Negative terminal voltage is lower than anode, A
4The output high level makes the PC conducting among the instruction circuit III, bulb DX
3Bright, Ic triggers and to enter temporary stable state, and end points 3 output high level make BCR conducting among Fig. 1 through St, and KA gets electric adhesive, the main circuit outage, thus controlled three-phase imbalance.Secondary coil BA
1, BA
2, BA
3Middle ac induction voltage and main circuit current are in proportion, and this voltage is circuit II in Fig. 2
3Rectifying and wave-filtering, II
3Comprise diode D
2, D
3, D
4, capacitor C
4, C
5, resistance R
3, W
2, via line II
3Voltage deliver to comparator A
3Positive input terminal, if voltage is higher than A
3Negative input end, illustrate that main circuit current is excessive, then A
3The output high level, PC conducting, bulb DX
2Bright, Ic, St, the BCR conducting among Fig. 1, the KA adhesive, main circuit disconnects, and has protected not overcurrent of main circuit.As Fig. 1, the induced voltage of zero-sequence current detector AH is through lead V
SS, AH ' reach among Fig. 2 by diode D
1, capacitor C
2, C
3, resistance R
0, R
1Rectifying and wave-filtering is through amplifier A
1Amplify, deliver to comparator A
2Positive input terminal, when the main circuit insulation against ground just often, A
2No-output is when the decline of insulation against ground value exceeds set point, to A
2The positive input terminal input voltage value is higher than negative input end, then A
2Output signals to command link III, PC conducting, bulb DX
3Bright, Ic is connected the BCR among Fig. 1, KA cuts off main circuit, thereby not enough enforcement of insulation against ground effectively protected.9. as Fig. 1, at lead V
SSAnd being connected with transient voltage protection device TVS between the lead Vx, its effect is to carry out fast Absorption exceeding setting voltage voltage in addition, to prevent each current-to-voltage convertor LB
1, LB
2, LB
3Coil BC
1, BC
2, BC
3Overcurrent when starting because of electrical installation, short circuit etc. produce surge voltage, to protect each control circuit.As Fig. 3 is outline drawing, and each circuit is housed in housing 10, and the three-phase main circuit is introduced from hole 11, draws from hole 12, and load closes the manual part open KA and is positioned at housing 10 surfaces, shows the bulb DX of low, the overcurrent of insulating, phase shortage
1, DX
2, DX
3Also be positioned at the surface of housing 10.
Claims (6)
1, a kind of multi-functional three-phase protective electronic switch; comprise sample circuit (I), comparison circuit (II), instruction circuit (III), executive circuit (IV), it is characterized in that: (1) sample circuit (I) comprises with three-phase main circuit (A), (B), (C) being the secondary coil (BC of the series connection of primary coil
1), (BC
2), (BC
3), one end and common wire (V
SS) link to each other; (2) comparison circuit (II) comprises rectifying and wave-filtering circuit and comparator (A
4), an end of rectifying and wave-filtering circuit links to each other with lead (Vx), the other end and comparator (A
4) negative input end links to each other comparator (A
4) output and instruction circuit (III) link to each other.
2, multi-functional three-phase protective electronic switch according to claim 1 is characterized in that: (1) sample circuit (I) also comprises with main circuit (A), (B), (C) being the secondary coil (BA of primary coil
1), (BA
2), (BA
3), each secondary coil (BA
1), (BA
2), (BA
3) an end each with common wire (V
SS) link to each other, each links to each other the other end with lead (Va), (Vb), (Vc); (2) in comparison circuit (II), also comprise rectifying and wave-filtering circuit and comparator (A
3), rectifying and wave-filtering circuit one end links to each other with lead (Va), (Vb), (Vc), the other end and comparator (A
3) positive input terminal link to each other comparator (A
3) output and instruction circuit (III) link to each other.
3, multi-functional three-phase protective electronic switch according to claim 1 is characterized in that: (1) also comprises zero-sequence current detector (AH), one end and common wire (V in sample circuit (I)
SS) link to each other, the other end links to each other with lead (AH '), and three-phase main circuit (A), (B), (C) pass from its centre bore; (2) in comparison circuit (II), also comprise rectifying and wave-filtering circuit, amplifier and comparator (A2), two ends (AH ') of the input of rectifying and wave-filtering circuit and current detector (AH), (V
SS) link to each other, the output of rectifying and wave-filtering circuit is through amplifier and comparator (A
2) positive input terminal link to each other comparator (A
2) output and instruction electric current (III) link to each other.
4, according to claim 1 or 2 or 3 described multi-functional three-phase protective electronic switches; it is characterized in that: described instruction circuit (III) comprises photoelectrical coupler (PC) and time-base circuit (Ic), by the input of photoelectrical coupler (PC) and each comparator (A of comparison circuit (II)
2), (A
3), (A
4) output link to each other, the collector electrode of photoelectrical coupler (PC) links to each other with the end points (S) of time-base circuit (Ic), the time collector (Ic) end points (3) link to each other with executive circuit (IV) through lead (St).
5, according to claim 1 or 2 or 3 described multi-functional three-phase protective electronic switches, it is characterized in that: described executive circuit (IV) comprises controllable silicon (BCR) and connected main circuit switch (KA), the end points (T of controllable silicon (BCR)
1) the end points (3) of time-base circuit (Ic) in lead (St) and instruction circuit (III) links to each other another end points of controllable silicon (BCR) (T
2) link to each other with the three-phase main circuit.
6, according to claim 1 or 2 or 3 described multi-functional three-phase protective electronic switches, it is characterized in that: in described sample circuit (I), at lead (V
SS) and lead (Vx) between be associated with transient voltage protection device (TVS).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98219172 CN2355485Y (en) | 1998-10-09 | 1998-10-09 | Multifunctional three phase protection electronic switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98219172 CN2355485Y (en) | 1998-10-09 | 1998-10-09 | Multifunctional three phase protection electronic switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2355485Y true CN2355485Y (en) | 1999-12-22 |
Family
ID=33971332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98219172 Expired - Fee Related CN2355485Y (en) | 1998-10-09 | 1998-10-09 | Multifunctional three phase protection electronic switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2355485Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545752A (en) * | 2011-12-31 | 2012-07-04 | 北京中科微电子技术有限公司 | Protective circuit of stepping motor driving circuit |
-
1998
- 1998-10-09 CN CN 98219172 patent/CN2355485Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545752A (en) * | 2011-12-31 | 2012-07-04 | 北京中科微电子技术有限公司 | Protective circuit of stepping motor driving circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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 |