CN204631177U - A kind of single phase low voltage distribution system Fault Pre pick-up unit - Google Patents
A kind of single phase low voltage distribution system Fault Pre pick-up unit Download PDFInfo
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- CN204631177U CN204631177U CN201520281561.3U CN201520281561U CN204631177U CN 204631177 U CN204631177 U CN 204631177U CN 201520281561 U CN201520281561 U CN 201520281561U CN 204631177 U CN204631177 U CN 204631177U
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- 238000001514 detection method Methods 0.000 claims abstract description 91
- 238000012544 monitoring process Methods 0.000 claims abstract description 43
- 230000005611 electricity Effects 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 abstract description 8
- 238000005265 energy consumption Methods 0.000 abstract description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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Abstract
A kind of single phase low voltage distribution system Fault Pre pick-up unit, relate to field of power, the current signal that the short circuit pre-detection of this technology and short circuit/overload on-line monitoring circuit obtain from the current transformer single phase low voltage distribution system leading-out terminal live wire, connects and composes loop by short circuit preliminary examination and short circuit/overload on-line monitoring circuit and load; Electric leakage preliminary examination circuit and on-line monitoring circuit obtain signal from detection of electrical leakage magnet ring 1, connect and compose loop by electric leakage preliminary examination circuit with electric leakage on-line monitoring circuit and load; The situation of the short circuit of pre-detection and online prison measure loop, overload, electric leakage, the pre-detection of this system and on-line monitoring function, can ensure the reliable and stable work of single-phase low-voltage distribution system, low in energy consumption, antijamming capability is strong.
Description
Technical field
The present invention relates to field of power, particularly relate to a kind of single phase low voltage distribution system fault pretest survey technology.
Background technology
The fault detect of existing single phase low voltage distribution system is carried out based on single phase low voltage distribution system on-line operation basis, if there occurs the fault of the single phase low voltage distribution systems such as short circuit, overload, electric leakage, overvoltage/undervoltage, only just can detect in connection loop.
At present, although develop some about the not online short circuit of single phase low voltage distribution system and detection of electrical leakage technology, but described technology also exists serious defect: mainly short-circuit resistance is all more than 10 Europe, detection of electrical leakage resistance is within 10K, the short circuit of single phase low voltage distribution system moral so usually can be caused to judge by accident, the phenomenon such as to leak electricity undetected, still short circuit based on single phase low voltage distribution system and electric leakage pre-detection system are proposed, make short-circuit resistance within 0.5 Europe, the preliminary examination technology of detection of electrical leakage resistance over the ground within 500K, substantially the fault pretest of single phase low voltage distribution system is met.
Summary of the invention
Instant invention overcomes weak point of the prior art, provide and a kind ofly before switch closes a floodgate, just check whether to there is short circuit, electric leakage, overvoltage/undervoltage, overload fault and the fault pretest survey technology that designs for single phase low voltage distribution system.
In order to realize object of the present invention, following for employing technical scheme is implemented by we:
A kind of single phase low voltage distribution system Fault Pre pick-up unit, it comprises: load;
To provide the single phase low voltage distribution system of electric power to described load; And
The magnetic latching relay be connected with output terminal and the load input terminal of described single phase low voltage distribution system, described magnetic latching relay contains magnetic and keeps driving circuit, and described magnetic keeps driving circuit to be that the operational order generated according to microprocessor detect signal drives magnetic latching relay work; It is characterized in that: described detection signal is by the I/O interface collection of single-chip microcomputer, and the I/O interface of described single-chip microcomputer is connected with the acquisition node leaked electricity on pre-detection and on-line monitoring circuit with short circuit pre-detection and short circuit/overload on-line monitoring circuit respectively;
Described short circuit pre-detection and short circuit/overload on-line monitoring circuit are made up of short circuit pre-detection circuit and short circuit/overload on-line monitoring circuit two parts, the signal of described short circuit/overload on-line monitoring circuit takes from the current transformer on the output live wire of described single phase low voltage distribution system, and the signal of short circuit pre-detection circuit takes from load end;
Described electric leakage pre-detection and on-line monitoring circuit comprise electric leakage pre-detection circuit and electric leakage on-line monitoring circuit two parts, the signal of described electric leakage pre-detection circuit takes from live wire and the zero line of the output terminal of single phase low voltage distribution system, and the signal of described electric leakage on-line monitoring circuit takes from described electric leakage pre-detection circuit.
Further, the signal taking from current transformer is transformed into voltage signal through R1 by described short circuit pre-detection and short circuit/overload on-line monitoring circuit, rectification is carried out by P1, the positive pole of P1 is connected with the positive pole of C1, the minus earth of P1 and C1, the positive pole of P1 with C1 is connected with the negative pole of WY1, the positive pole of WY1 is connected with one end of the negative pole of WY2 and R2, the other end of R2 is connected with the positive pole of D2, the positive pole of WY2 is connected with the positive pole of D1, on line between one end of the negative pole access R4 of D1 and D2 and the negative pole of D3, on line between the other end of the positive pole access R2 of C2 and the positive pole of D2, the minus earth of C2, the negative pole of C1 is connected with the negative electrode of T1, and the control pole of T1 is connected with one end of R3, the other end ground connection of R3, and the anode of T1 is connected with one end of R5 and described acquisition node, and the other end of R5 is connected with 12V power supply, the other end of R4 is connected with the control pole of T1, on line between one end of the positive pole access R6 of D3 and the anode of T2, the plus earth of T2, the control pole of T2 is connected with one end of R10, and the other end of R10 is connected with one end of R11, the other end ground connection of R11, the other end of R6 is connected with a node of one end of R7 and JDQ2, on the line between one end of the other end access R9 of R7 and one end of R8, on the line between the other end of the other end access R10 of R9 and one end of R11, one node of JDQ2 is connected with 11 pins of ULN2003, and a node of JDQ2 is connected with 12V power supply, and a node of JDQ2 is connected with 12V-Y1 power supply, 16 pins of ULN2003 are connected with a node of JDQ1, one node of JDQ1 is connected with 12V-Y1 power supply, and a node of JDQ1 is connected with the other end of R8, a node ground connection of JDQ1, one node of JDQ1 is connected with the live wire of load end, and a node of JDQ1 is connected with the zero line of load end, 1 of ULN2003 is connected with the I/O interface of single-chip microcomputer with 6 pins.
Further, described electric leakage pre-detection circuit is made up of transformer, detection of electrical leakage magnet ring 1, detection of electrical leakage magnet ring 2, detection of electrical leakage magnet ring 3, overload detection magnet ring, JDQ3, JDQ4, JDQ5, converter, resistance R12 and R13, the end of incoming cables of described transformer is connected with the output terminal of described single phase low voltage distribution system, the live wire of the output terminal of transformer is connected with the input end of electric pressure converter with zero line, and the output terminal of electric pressure converter is microcontroller power supply; The live wire of the output terminal of transformer is connected with one end of detection of electrical leakage magnet ring 3, and the other end of detection of electrical leakage magnet ring 3 is connected by resistance one end with overload detection magnet ring, and the other end of overload detection magnet ring is connected with the zero line of the output terminal of transformer; The zero line of transformer output terminal is connected with the input node of JDQ4 by resistance, the output node of JDQ4 is connected with one end of detection of electrical leakage magnet ring 2, one node of JDQ4 is connected with+12V power supply, the other end of detection of electrical leakage magnet ring 2 is connected with the input node of JDQ5, the output node of JDQ5 is connected with the zero line of load end, and a node of JDQ5 is connected with+12V power supply; Described JDQ3 and transformers connected in parallel; Described detection of electrical leakage magnet ring 1 is connected with described electric leakage on-line monitoring circuit.
Further, described electric leakage on-line monitoring circuit is made up of U1, D3, D4, D5, C3, C4, C5, C6, C7, C8, C9, R14, R15, R16 and T3, pin 8 and one end of C9 and the equipotential link of 15V of described U1, the other end ground connection of C9; The pin 7 of U1 is connected with one end of the control pole of T3 and C3, and the other end of C3 is connected with the negative electrode of T3, and the anode of T3 is connected with the negative electrode of D3, and the anode of D3 is connected with one end of the I/O interface of single-chip microcomputer and R16, and the other end of R16 is connected with 12V power supply; The pin 6 of U1 is connected with one end of C4, and the other end of C4 is connected with the negative electrode of T3; The pin 5 of U1 is connected with one end of the pin 4 of U1 and C5, and the other end of C5 is connected with the negative electrode of T3, the plus earth of T3; Pin 3 ground connection of U1, and being connected with one end of C8, one end of one end of one end of the other end of C8 and the pin 1 of U1, C6, one end of C7, R14, the positive pole of D4, the negative pole of D5 and detection of electrical leakage magnet ring 1 is connected; The pin 2 of U1 is connected with the other end of C6 and one end of R15, and the other end of the other end of the other end of R15 and the other end of C7, R14, the negative pole of D4, the positive pole of D5 and detection of electrical leakage magnet ring 1 is connected.
Beneficial effect:
The present invention be directed to each loop of single phase low voltage distribution system before combined floodgate, transformer is utilized to export the alternating current of small-signal to the live wire of load, by the pickup of detection of electrical leakage magnet ring 2, detected by detection of electrical leakage modular circuit again, when load exists earth fault, detection of electrical leakage magnet ring 1 can induce corresponding electric leakage signal, and triggers corresponding controllable silicon, after single-chip microcomputer obtains electric leakage signal, refuse to close a floodgate to magnetic maintained switch; If load does not exist electric leakage signal, meanwhile, the direct current utilizing transformer to export is to the live wire of load, by short-circuit detecting modular circuit, when system exists short-circuit signal, corresponding controllable silicon can trigger, control system can be excited simultaneously to provide corresponding alerting signal, and refuse magnetic maintenance combined floodgate; The pre-detection of this system and on-line monitoring function, can ensure the reliable and stable work of single-phase low-voltage distribution system, low in energy consumption, antijamming capability is strong.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below.Obviously, the accompanying drawing in the following describes is only some embodiments of the present invention; For those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is block diagram of the present invention;
Fig. 2 is short circuit preliminary examination and short circuit/overload on-line monitoring circuit diagram in the present invention;
Fig. 3 is the pre-detection circuit figure that leaks electricity in the present invention;
Fig. 4 is the on-line monitoring circuit diagram that leaks electricity in the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, clear, complete description is carried out to the technical scheme in the embodiment of the present invention.Obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
As shown in Figure 1, structure of the present invention is as follows:
A kind of single phase low voltage distribution system fault pretest survey technology, it comprises: load; To provide the single phase low voltage distribution system of electric power to described load; And the magnetic latching relay to be connected with output terminal and the load input terminal of described single phase low voltage distribution system, described magnetic latching relay contains magnetic and keeps driving circuit, and described magnetic keeps driving circuit to be that the operational order generated according to microprocessor detect signal drives magnetic latching relay work; Wherein: described detection signal is by the I/O interface collection of single-chip microcomputer, and the I/O interface of described single-chip microcomputer is connected with the acquisition node leaked electricity on pre-detection and on-line monitoring circuit with short circuit pre-detection and short circuit/overload on-line monitoring circuit respectively;
Described short circuit pre-detection and short circuit/overload on-line monitoring circuit are made up of short circuit pre-detection circuit and short circuit/overload on-line monitoring circuit two parts, the signal of described short circuit/overload on-line monitoring circuit takes from the current transformer on the output live wire of described single phase low voltage distribution system, and the signal of short circuit pre-detection circuit takes from load end;
Described electric leakage pre-detection and on-line monitoring circuit comprise electric leakage pre-detection circuit and electric leakage on-line monitoring circuit two parts, the signal of described electric leakage pre-detection circuit takes from live wire and the zero line of the output terminal of single phase low voltage distribution system, and the signal of described electric leakage on-line monitoring circuit takes from described electric leakage pre-detection circuit.
As shown in Figure 2, described short circuit preliminary examination and short circuit/overload on-line monitoring circuit connecting mode as described below:
The signal taking from current transformer is transformed into voltage signal through R1 by described short circuit pre-detection and short circuit/overload on-line monitoring circuit, rectification is carried out by P1, the positive pole of P1 is connected with the positive pole of C1, the minus earth of P1 and C1, the positive pole of P1 with C1 is connected with the negative pole of WY1, the positive pole of WY1 is connected with one end of the negative pole of WY2 and R2, the other end of R2 is connected with the positive pole of D2, the positive pole of WY2 is connected with the positive pole of D1, on line between one end of the negative pole access R4 of D1 and D2 and the negative pole of D3, on line between the other end of the positive pole access R2 of C2 and the positive pole of D2, the minus earth of C2, the negative pole of C1 is connected with the negative electrode of T1, and the control pole of T1 is connected with one end of R3, the other end ground connection of R3, and the anode of T1 is connected with one end of R5 and described acquisition node, and the other end of R5 is connected with 12V power supply, the other end of R4 is connected with the control pole of T1, on line between one end of the positive pole access R6 of D3 and the anode of T2, the plus earth of T2, the control pole of T2 is connected with one end of R10, and the other end of R10 is connected with one end of R11, the other end ground connection of R11, the other end of R6 is connected with a node of one end of R7 and JDQ2, on the line between one end of the other end access R9 of R7 and one end of R8, on the line between the other end of the other end access R10 of R9 and one end of R11, one node of JDQ2 is connected with 11 pins of ULN2003, and a node of JDQ2 is connected with 12V power supply, and a node of JDQ2 is connected with 12V-Y1 power supply, 16 pins of ULN2003 are connected with a node of JDQ1, one node of JDQ1 is connected with 12V-Y1 power supply, and a node of JDQ1 is connected with the other end of R8, a node ground connection of JDQ1, one node of JDQ1 is connected with the live wire of load end, and a node of JDQ1 is connected with the zero line of load end, 1 of ULN2003 is connected with the I/O interface of single-chip microcomputer with 6 pins.
As shown in Figure 3, the connected mode of described electric leakage pre-detection circuit is as described below:
Described electric leakage pre-detection circuit is made up of transformer, detection of electrical leakage magnet ring 1, detection of electrical leakage magnet ring 2, detection of electrical leakage magnet ring 3, overload detection magnet ring, JDQ3, JDQ4, JDQ5, converter, resistance R12 and R13, the end of incoming cables of described transformer is connected with the output terminal of described single phase low voltage distribution system, the live wire of the output terminal of transformer is connected with the input end of electric pressure converter with zero line, and the output terminal of electric pressure converter is microcontroller power supply; The live wire of the output terminal of transformer is connected with one end of detection of electrical leakage magnet ring 3, and the other end of detection of electrical leakage magnet ring 3 is connected by resistance one end with overload detection magnet ring, and the other end of overload detection magnet ring is connected with the zero line of the output terminal of transformer; The zero line of transformer output terminal is connected with the input node of JDQ4 by resistance, the output node of JDQ4 is connected with one end of detection of electrical leakage magnet ring 2, one node of JDQ4 is connected with+12V power supply, the other end of detection of electrical leakage magnet ring 2 is connected with the input node of JDQ5, the output node of JDQ5 is connected with the zero line of load end, and a node of JDQ5 is connected with+12V power supply; Described JDQ3 and transformers connected in parallel; Described detection of electrical leakage magnet ring 1 is connected with described electric leakage on-line monitoring circuit.
As shown in Figure 4, described electric leakage on-line monitoring circuit structure is as follows: described electric leakage on-line monitoring circuit is made up of U1, D3, D4, D5, C3, C4, C5, C6, C7, C8, C9, R14, R15, R16 and T3, pin 8 and one end of C9 and the equipotential link of 15V of described U1, the other end ground connection of C9; The pin 7 of U1 is connected with one end of the control pole of T3 and C3, and the other end of C3 is connected with the negative electrode of T3, and the anode of T3 is connected with the negative electrode of D3, and the anode of D3 is connected with one end of the I/O interface of single-chip microcomputer and R16, and the other end of R16 is connected with 12V power supply; The pin 6 of U1 is connected with one end of C4, and the other end of C4 is connected with the negative electrode of T3; The pin 5 of U1 is connected with one end of the pin 4 of U1 and C5, and the other end of C5 is connected with the negative electrode of T3, the plus earth of T3; Pin 3 ground connection of U1, and being connected with one end of C8, one end of one end of one end of the other end of C8 and the pin 1 of U1, C6, one end of C7, R14, the positive pole of D4, the negative pole of D5 and detection of electrical leakage magnet ring 1 is connected; The pin 2 of U1 is connected with the other end of C6 and one end of R15, and the other end of the other end of the other end of R15 and the other end of C7, R14, the negative pole of D4, the positive pole of D5 and detection of electrical leakage magnet ring 1 is connected.
Embodiment 1
As depicted in figs. 1 and 2,
1., when circuit is in rated current, when mutual inductor current value is out less, stabilivolt WY1 not conducting, controllable silicon T1 not conducting, single-chip microcomputer can not receive T1 Continuity signal.
2., when circuit overloads, stabilivolt WY1 conducting, WY2 is not enough to conducting, and now electric current is by R2, and to C2 charging, reach certain time delay and make controllable silicon T1 conducting, single-chip microcomputer receives low level signal, represents that circuit there occurs overload or short circuit.
3. when external circuit is short-circuited, mutual inductor electric current is out comparatively large, stabilivolt WY1 conducting, simultaneously stabilivolt T2 also conducting, and circuit is directly by WY2--D1-R4, and make T1 conducting fast, single-chip microcomputer receives low level signal, represents that circuit there occurs overload or short circuit.
Embodiment 3:
As shown in figures 1 and 3, when there being electric leakage to occur, detection of electrical leakage magnet ring 1 induces electric current and makes controllable silicon T3 conducting through integrated package U1, and single-chip microcomputer collects the signal of electric leakage generation by detection of electrical leakage magnet ring 1 simultaneously, give an order and magnetic latching relay is disconnected, both made load circuit disconnect.
Claims (4)
1. a single phase low voltage distribution system Fault Pre pick-up unit, it comprises: load;
To provide the single phase low voltage distribution system of electric power to described load; And
The magnetic latching relay be connected with output terminal and the load input terminal of described single phase low voltage distribution system, described magnetic latching relay contains magnetic and keeps driving circuit, and described magnetic keeps driving circuit to be that the operational order generated according to microprocessor detect signal drives magnetic latching relay work; It is characterized in that: described detection signal is by the I/O interface collection of single-chip microcomputer, and the I/O interface of described single-chip microcomputer is connected with the acquisition node leaked electricity on pre-detection and on-line monitoring circuit with short circuit pre-detection and short circuit/overload on-line monitoring circuit respectively;
Described short circuit pre-detection and short circuit/overload on-line monitoring circuit are made up of short circuit pre-detection circuit and short circuit/overload on-line monitoring circuit two parts, the signal of described short circuit/overload on-line monitoring circuit takes from the current transformer on the output live wire of described single phase low voltage distribution system, and the signal of short circuit pre-detection circuit takes from load end;
Described electric leakage pre-detection and on-line monitoring circuit comprise electric leakage pre-detection circuit and electric leakage on-line monitoring circuit two parts, the signal of described electric leakage pre-detection circuit takes from live wire and the zero line of the output terminal of single phase low voltage distribution system, and the signal of described electric leakage on-line monitoring circuit takes from described electric leakage pre-detection circuit.
2. a kind of single phase low voltage distribution system Fault Pre pick-up unit according to claim 1, it is characterized in that: the signal taking from current transformer is transformed into voltage signal through R1 by described short circuit pre-detection and short circuit/overload on-line monitoring circuit, rectification is carried out by P1, the positive pole of P1 is connected with the positive pole of C1, the minus earth of P1 and C1, the positive pole of P1 with C1 is connected with the negative pole of WY1, the positive pole of WY1 is connected with one end of the negative pole of WY2 and R2, the other end of R2 is connected with the positive pole of D2, the positive pole of WY2 is connected with the positive pole of D1, on line between one end of the negative pole access R4 of D1 and D2 and the negative pole of D3, on line between the other end of the positive pole access R2 of C2 and the positive pole of D2, the minus earth of C2, the negative pole of C1 is connected with the negative electrode of T1, and the control pole of T1 is connected with one end of R3, the other end ground connection of R3, and the anode of T1 is connected with one end of R5 and described acquisition node, and the other end of R5 is connected with 12V power supply, the other end of R4 is connected with the control pole of T1, on line between one end of the positive pole access R6 of D3 and the anode of T2, the plus earth of T2, the control pole of T2 is connected with one end of R10, and the other end of R10 is connected with one end of R11, the other end ground connection of R11, the other end of R6 is connected with a node of one end of R7 and JDQ2, on the line between one end of the other end access R9 of R7 and one end of R8, on the line between the other end of the other end access R10 of R9 and one end of R11, one node of JDQ2 is connected with 11 pins of ULN2003, and a node of JDQ2 is connected with 12V power supply, and a node of JDQ2 is connected with 12V-Y1 power supply, 16 pins of ULN2003 are connected with a node of JDQ1, one node of JDQ1 is connected with 12V-Y1 power supply, and a node of JDQ1 is connected with the other end of R8, a node ground connection of JDQ1, one node of JDQ1 is connected with the live wire of load end, and a node of JDQ1 is connected with the zero line of load end, 1 of ULN2003 is connected with the I/O interface of single-chip microcomputer with 6 pins.
3. a kind of single phase low voltage distribution system Fault Pre pick-up unit according to claim 1, it is characterized in that: described electric leakage pre-detection circuit is made up of transformer, detection of electrical leakage magnet ring 1, detection of electrical leakage magnet ring 2, detection of electrical leakage magnet ring 3, overload detection magnet ring, JDQ3, JDQ4, JDQ5, converter, resistance R12 and R13, the end of incoming cables of described transformer is connected with the output terminal of described single phase low voltage distribution system, the live wire of the output terminal of transformer is connected with the input end of electric pressure converter with zero line, and the output terminal of electric pressure converter is microcontroller power supply; The live wire of the output terminal of transformer is connected with one end of detection of electrical leakage magnet ring 3, and the other end of detection of electrical leakage magnet ring 3 is connected by resistance one end with overload detection magnet ring, and the other end of overload detection magnet ring is connected with the zero line of the output terminal of transformer; The zero line of transformer output terminal is connected with the input node of JDQ4 by resistance, the output node of JDQ4 is connected with one end of detection of electrical leakage magnet ring 2, one node of JDQ4 is connected with+12V power supply, the other end of detection of electrical leakage magnet ring 2 is connected with the input node of JDQ5, the output node of JDQ5 is connected with the zero line of load end, and a node of JDQ5 is connected with+12V power supply; Described JDQ3 and transformers connected in parallel; Described detection of electrical leakage magnet ring 1 is connected with described electric leakage on-line monitoring circuit.
4. a kind of single phase low voltage distribution system Fault Pre pick-up unit according to claim 1 or 3, it is characterized in that: described electric leakage on-line monitoring circuit is made up of U1, D3, D4, D5, C3, C4, C5, C6, C7, C8, C9, R14, R15, R16 and T3, pin 8 and one end of C9 and the equipotential link of 15V of described U1, the other end ground connection of C9; The pin 7 of U1 is connected with one end of the control pole of T3 and C3, and the other end of C3 is connected with the negative electrode of T3, and the anode of T3 is connected with the negative electrode of D3, and the anode of D3 is connected with one end of the I/O interface of single-chip microcomputer and R16, and the other end of R16 is connected with 12V power supply; The pin 6 of U1 is connected with one end of C4, and the other end of C4 is connected with the negative electrode of T3; The pin 5 of U1 is connected with one end of the pin 4 of U1 and C5, and the other end of C5 is connected with the negative electrode of T3, the plus earth of T3; Pin 3 ground connection of U1, and being connected with one end of C8, one end of one end of one end of the other end of C8 and the pin 1 of U1, C6, one end of C7, R14, the positive pole of D4, the negative pole of D5 and detection of electrical leakage magnet ring 1 is connected; The pin 2 of U1 is connected with the other end of C6 and one end of R15, and the other end of the other end of the other end of R15 and the other end of C7, R14, the negative pole of D4, the positive pole of D5 and detection of electrical leakage magnet ring 1 is connected.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520281561.3U CN204631177U (en) | 2015-04-27 | 2015-04-27 | A kind of single phase low voltage distribution system Fault Pre pick-up unit |
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| CN201520281561.3U CN204631177U (en) | 2015-04-27 | 2015-04-27 | A kind of single phase low voltage distribution system Fault Pre pick-up unit |
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| CN204631177U true CN204631177U (en) | 2015-09-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106950458A (en) * | 2017-03-15 | 2017-07-14 | 国家电网公司 | The short circuit of low pressure uniline and disconnection detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106950458A (en) * | 2017-03-15 | 2017-07-14 | 国家电网公司 | The short circuit of low pressure uniline and disconnection detection device |
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