CN202997506U - A residual current protective device with a wide dynamic range - Google Patents
A residual current protective device with a wide dynamic range Download PDFInfo
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- CN202997506U CN202997506U CN 201220657328 CN201220657328U CN202997506U CN 202997506 U CN202997506 U CN 202997506U CN 201220657328 CN201220657328 CN 201220657328 CN 201220657328 U CN201220657328 U CN 201220657328U CN 202997506 U CN202997506 U CN 202997506U
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Abstract
Provided is a residual current protective device with a wide dynamic range. The residual current protective device comprises a compound residual current transformer, a residual current small signal detection and control driving circuit, a residual current large signal detection and control driving circuit, an execution unit, and a trip coil. The compound residual current transformer is composed of a composite iron core and two mutually independent secondary windings. The two secondary windings are connected with the input ends of the two residual current signal detection and control driving circuits, respectively. The composite iron core is formed by winding a permalloy tape and a silicon steel sheet tape in a segmented manner. The residual current protective device is not only capable of accurately detecting residual current at a milliampere level, but also capable of detecting residual current at an ampere level. The dynamic range of the residual current protective device may reach 106. The residual current protective device has a protective effect on people caused by electric shock or a device caused by electrical leakage accidents and has a protective effect on an electric device resulting in accidents caused by large residual current generated by ground faults.
Description
Technical field
The utility model relates to the residual current protecting technical field, particularly a kind of Aftercurrent protecting equipment of wide dynamic range.
Background technology
The circuit block diagram of existing Aftercurrent protecting equipment is shown in Figure 1.This device is controlled with driver element 4, performance element 5 and tripping coil 6 and is formed by the residual current transformer 1 of Single Iron core material, residual current signal amplification demodulator unit 3, the identification of residual current signal, and amplification demodulator unit 3, identification is controlled is provided after rectifier 7 rectifications by three-phase and four-line (A, B, C, N) main circuit power supply with the dc supply of driver element 4, performance element 5.
Residual current transformer (ZCT) 1 as the residual current sensing device, generally to be consisted of by the iron core 1-1 that adopts single permalloy tape (or ultramicro-crystal alloy band) coiling and the secondary winding 1-2 on iron core 1-1, be the appearance structure of annular, shown in Figure 2.
Detected is that protected main circuit main line must first pass residual current transformer 1 and could arrive load-side 2.When person electric shock or electric leakage accident appear in load-side 2, shown in Figure 1, will form residual current I △ on the secondary winding 1-2 of residual current transformer 1 and be expressed from the next:
When the residual current I △ value that occurs meets or exceeds the fiducial value of setting, residual current operated protective device will trip in setting-up time, thereby cut off the electricity supply, and play a protective role.
The residual current I △ that is collected by the secondary winding 1-2 of residual current transformer (ZCT) 1 is generally * 100 microampere orders, need through amplify and detection after just can deal with.If the specified residual current that allows is I △ n value, work as I △＞
During I △ n, controls by identification after I △ signal recognition unit 3 is differentiated export with driver element 4 that thereby controlled silicon conducting that a high level signal removes to trigger performance element 5 makes in tripping coil 6 loops that are connected on controllable silicon and anode must the electric killer switch that cuts off, make the load dead electricity, thereby avoided further expanding of electric leakage accident.
But this is not to mean that residual current I △ value can increase arbitrarily without restriction, in the ordinary course of things, (the residual current I △ signal that collects on secondary winding 1-2 during the scope of 5mA ~ 1000mA) is the same with principal current when residual current I △ value is in milliampere level, it is the sine wave of 50Hz, and its amplitude also is directly proportional to the size of residual current, thereby can be in real time and reflect exactly the failure condition at electricity consumption scene.But when residual current I △ value meet or exceed peace doubly level (＞when 1A) above, serious distortion will appear in the residual current I △ signal that in fact collects in the residual current detection loop, and residual current is larger, I △ signal amplitude reduces on the contrary, and this will cause the residual current signal to identify the situation that the loop can't work or occur judging by accident.Trace it to its cause, this because of this moment residual current transformer 1 met or exceeded iron core 1-1 " magnetic saturation " state.
By analysis as can be known: the iron core 1-1 of the residual current transformer 1 that employing permalloy tape or ultramicro-crystal alloy band turn to; during for detection mA level residual current, higher sensitivity can be arranged; but because its saturation induction density is not high; be generally 0.5 ~ 0.6 tesla; cause when large residual current occurring; the I △ signal distortion that collects from the secondary winding of ZCT; amplitude descends; this situation will cause the residual current operated protective device akinesia or can not " trip ", thereby the situation of erroneous judgement occur.
The electric Vent of human electric shock and power consumption equipment leaks formed residual current I △ value and is generally mA level (5mA ~ 1000mA); although the more serious earth fault current of power consumption equipment arrives greatly the number peace doubly or higher level sometimes; for example; single phase ground fault; but the reason due to above-mentioned iron core " magnetic saturation "; the numerical value of the residual current I △ value that its secondary winding 1-2 senses reaches far away the specified running current value of residual current circuit breaker sometimes; thereby circuit breaker can not move (carry out tripping operation) yet, do not have protective effect.Thereby this problem is not as solving the catastrophic consequence that also will bring such as " fire ".
Summary of the invention
The purpose of this utility model is to provide a kind of Aftercurrent protecting equipment of wide dynamic range; it not only can detect the mA level (residual current of 5mA ~ 1000mA) exactly; and (〉=1A) residual current, its dynamic range ratio of residual current minimum value (the residual current maximum with) can reach 10 to detect ampere level
6Above; adopt the Aftercurrent protecting equipment of this wide dynamic range; not only can people or the equipment that human electric shock or the electric Vent leakage of equipment accident occur be played a protective role, the power consumption equipment that can also cause the accident to the larger residual current that power consumption equipment produces because of earth fault plays a protective role.
the technical solution that the utility model proposes is such: a kind of Aftercurrent protecting equipment of wide dynamic range, include three-phase and four-line (L1, L2, L3, N) residual current transformer that passes of main circuit power supply, by the rectifier 7 of this main circuit power supply power supply and the tripping coil 6 of residual current circuit breaker, protective device is supplied with dc supply by rectifier 7, described residual current transformer is compound residual current transformer 11, this compound residual current transformer 11 turns to respectively the 1st iron core 11-1 and the 2nd iron core 11-2 by permalloy tape and silicon steel sheet band and is wound on the 1st iron core 11-1 and the 1st winding 11-3 and the 2nd winding 11-4 of the 2nd iron core 11-2 outside form, also be provided with the 1st residual current small-signal amplification demodulator unit 13, the 2nd residual current large-signal amplification demodulator unit 16, the 1st residual current small-signal identification is controlled and driver element 14, the 2nd residual current large-signal identification is controlled and driver element 17, the 1st diode 15, the 2nd diode 18 and performance element 5, described performance element 5 adopts controllable silicon, described the 1st winding 11-3 output in order respectively with the 1st residual current small-signal amplification demodulator unit 13, the 1st residual current small-signal identification is controlled and driver element 14, the 1st diode 15 anodes are connected in series, described the 2nd winding 11-4 output in order respectively with the 2nd residual current large-signal amplification demodulator unit 16, the 2nd residual current large-signal identification is controlled and driver element 17, the 2nd diode 18 anodes are connected in series, trigger with controllable silicon 5 after described the 1st diode 15 negative electrodes and the 2nd diode 18 negative electrode parallel connections and be connected, described tripping coil 6 is connected in controllable silicon 5 anode loops.
The 1st iron core 11-1 of described compound residual current transformer 11 is positioned at the nexine of annular iron core, and the 2nd iron core 11-2 is positioned at the skin of annular iron core, and the 1st winding 11-3 and the 2nd winding 11-4 independently are wound on the 2nd iron core 11-2 outside.The 1st iron core 11-1 also can select the coiling of ultramicro-crystal alloy band to form.
Compared with prior art, the utlity model has following beneficial effect:
Because being applicable to detect the little residual current of mA level but not being suitable for, permalloy or ultramicro-crystal alloy detect the above large residual current of ampere level, this is because due to its saturation induction density not high (0.5 ~ 0.6 tesla), although and its initial permeability of silicon steel sheet low be not suitable for detect the mA level (residual current of 5mA ~ 1000mA) be because its saturation induction density higher (reaching 1.8 teslas) is applicable to detect the above large residual current of ampere level.If these two kinds of core materials are combined a kind of residual current transformer of compound iron core, can play the effect of mutual supplement with each other's advantages, thereby can realize that large and small residual current can detect, its dynamic range can reach 10
6Above.Thereby Aftercurrent protecting equipment of the present utility model can detect main circuit power supply and little residual current occur (5mA ~ 1000mA) also can detect the large residual current that main circuit power supply occurs (1A ~ 100A), and drive circuit breaker trip.Can not only people or the equipment that human electric shock or the electric leakage accident of equipment occur be played a protective role like this, the power consumption equipment that can also cause the accident to the larger residual current that power consumption equipment produces because of earth fault plays a protective role.
Description of drawings
Fig. 1 is the electric theory diagram of existing a kind of Aftercurrent protecting equipment.
Fig. 2 is the structural representation of residual current transformer shown in Figure 1.
Fig. 3 is the electric theory diagram of Aftercurrent protecting equipment of a kind of wide dynamic range of an embodiment of the utility model.
Fig. 4 is the structural representation of compound residual current transformer shown in Figure 3.
Embodiment
By following embodiment, the utility model is further elaborated.
Referring to Fig. 3, shown in Figure 4, a kind of Aftercurrent protecting equipment of wide dynamic range is controlled with driver element 14, the 2nd residual current large-signal identification control and is formed with the tripping coil 6 of driver element 17, the 1st diode 15, the 2nd diode 18, performance element 5, rectifier 7 and circuit breaker by compound residual current transformer 11, the 1st residual current small-signal amplification demodulator unit the 13, the 2nd residual current large-signal amplification demodulator unit the 16, the 1st residual current small-signal identification.Compound residual current transformer 11 turns to the 1st iron core 11-1 by permalloy tape, be positioned at the inside of annular composite iron core, turn to the 2nd iron core 11-2 by silicon steel sheet, be positioned at outside the 1st iron core 11-1, silicon steel sheet is selected the cold rolled silicon steel strip and is required its grain orientation identical with the length direction of silicon strip, to reach high as far as possible saturation induction density, compound residual current transformer 11 is wound with the 1st separate winding 11-3 and the 2nd winding 11-4 outside the 2nd iron core 11-2.The 1st winding 11-3 output is controlled with driver element 14 and the 1st diode 15 anodes with the 1st residual current small-signal amplification demodulator unit the 13, the 1st residual current small-signal identification successively and is connected in series; The 2nd winding 11-4 output is controlled with driver element 17 and the 2nd diode 18 anodes with the 2nd residual current large-signal amplification demodulator unit the 16, the 2nd residual current large-signal identification successively and is connected in series; Be connected with the controllable silicon trigger electrode of executable unit 5 after the 1st diode 15 negative electrodes and the 2nd diode 18 negative electrode parallel connections, the tripping coil 6 of residual current circuit breaker is connected in the anode loop of controllable silicon 5; Three-phase and four-line formula main circuit power supply is controlled with driver element 14, the 2nd residual current large-signal amplification demodulator unit the 16, the 2nd residual current large-signal identification through backward the 1st residual current small-signal amplification demodulator unit the 13, the 1st residual current small-signal identification of rectifier 7 rectifications and is controlled with driver element 17 and performance element 5 dc supply is provided.
The 1st winding 11-3 of compound residual current transformer 11 is used for the mA level, and (5mA ~ 1000mA) collection and processing of residual current I △ small-signal, its 2nd winding 11-4 is used for ampere and higher level (collection and the processing of 1 ~ 100A) residual current I △ large-signal.Adopt so compound residual current transformer and two circuit input control loop could realize the residual current safeguard protection of wide dynamic range, fully, effectively protected the power consumption equipment of load-side 2.
In the design of intelligent residual current circuit breaker, be slightly distinguishing for the processing of the residual current I △ small-signal of mA level and the residual current I △ large-signal of ampere level.Residual current I △ small-signal for the mA level requires accuracy of detection higher, and operate time is adjustable, and the result of detection also requires a series of accurate operations such as demonstration, memory and transmission; For the residual current I △ large-signal of ampere level, main if it were not for requiring accuracy of detection, but can promptly make the reaction of circuit breaker trip action when requiring large residual current occurs.
During work, when residual current I △ signal is less, during for the mA level, residual current I △ small-signal identification is controlled with driver element 14 and can be made the accurate response that whether needs to make the residual current circuit breaker tripping operation; When residual current I △ signal reaches ampere level when above, if the 1st residual current small-signal identification is controlled and driver element 14 can not make accurate differentiations the time, the 2nd residual current large-signal identification is controlled and driver element 17 can replace that the 1st residual current small-signal identification is controlled and driver element 14 and accurate response that the residual current circuit breaker of sening as an envoy to trips.
Claims (3)
1. the Aftercurrent protecting equipment of a wide dynamic range, include the residual current transformer that the three-phase and four-line main circuit power supply passes, by the rectifier (7) of this main circuit power supply power supply and the tripping coil (6) of residual current circuit breaker, protective device is supplied with dc supply by rectifier (7), it is characterized in that: described residual current transformer is compound residual current transformer (11), this compound residual current transformer (11) turns to respectively the 1st iron core (11-1) and the 2nd iron core (11-2) by permalloy tape and silicon steel sheet band and is wound on the 1st iron core (11-1) and the 1st winding (11-3) and the 2nd winding (11-4) of the 2nd iron core (11-2) outside form, also be provided with the 1st residual current small-signal amplification demodulator unit (13), the 2nd residual current large-signal amplification demodulator unit (16), the 1st residual current small-signal identification is controlled and driver element (14), the 2nd residual current large-signal identification is controlled and driver element (17), the 1st diode (15), the 2nd diode (18) and performance element (5), described performance element (5) adopts controllable silicon, described the 1st winding (11-3) output in order respectively with the 1st residual current small-signal amplification demodulator unit (13), the 1st residual current small-signal identification is controlled and driver element (14), the 1st diode (15) anode is connected in series, described the 2nd winding (11-4) output in order respectively with the 2nd residual current large-signal amplification demodulator unit (16), the 2nd residual current large-signal identification is controlled and driver element (17), the 2nd diode (18) anode is connected in series, trigger with controllable silicon (5) after described the 1st diode (15) negative electrode and the 2nd diode (18) negative electrode parallel connection and be connected, described tripping coil (6) is connected in controllable silicon (5) anode loop.
2. the Aftercurrent protecting equipment of wide dynamic range according to claim 1; it is characterized in that: the 1st iron core (11-1) of described compound residual current transformer (11) is positioned at the nexine of annular iron core; the 2nd iron core (11-2) is positioned at the skin of annular iron core, and the 1st winding (11-3) and the 2nd winding (11-4) independently are wound on the 2nd iron core (11-2) outside.
3. the Aftercurrent protecting equipment of wide dynamic range according to claim 1, it is characterized in that: the 1st iron core (11-1) selects the coiling of ultramicro-crystal alloy band to form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220657328 CN202997506U (en) | 2012-12-04 | 2012-12-04 | A residual current protective device with a wide dynamic range |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220657328 CN202997506U (en) | 2012-12-04 | 2012-12-04 | A residual current protective device with a wide dynamic range |
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| CN202997506U true CN202997506U (en) | 2013-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220657328 Expired - Lifetime CN202997506U (en) | 2012-12-04 | 2012-12-04 | A residual current protective device with a wide dynamic range |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946085A (en) * | 2012-12-04 | 2013-02-27 | 广东佛电电器有限公司 | Wide-dynamic-range residual current protection device |
| CN106229937A (en) * | 2016-08-19 | 2016-12-14 | 天津市百利电气有限公司 | Have the chopper of ground protection and creepage protection function concurrently |
| CN112436484A (en) * | 2020-11-12 | 2021-03-02 | 重庆唯此科技有限公司 | Low-voltage intelligent circuit breaker with multiple residual current protection functions |
-
2012
- 2012-12-04 CN CN 201220657328 patent/CN202997506U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946085A (en) * | 2012-12-04 | 2013-02-27 | 广东佛电电器有限公司 | Wide-dynamic-range residual current protection device |
| CN106229937A (en) * | 2016-08-19 | 2016-12-14 | 天津市百利电气有限公司 | Have the chopper of ground protection and creepage protection function concurrently |
| CN106229937B (en) * | 2016-08-19 | 2018-08-21 | 天津市百利电气有限公司 | Have the breaker of ground protection and creepage protection function concurrently |
| CN112436484A (en) * | 2020-11-12 | 2021-03-02 | 重庆唯此科技有限公司 | Low-voltage intelligent circuit breaker with multiple residual current protection functions |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130612 |