CN204989371U - Zero line loss of phase detection circuitry - Google Patents
Zero line loss of phase detection circuitry Download PDFInfo
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- CN204989371U CN204989371U CN201520566014.XU CN201520566014U CN204989371U CN 204989371 U CN204989371 U CN 204989371U CN 201520566014 U CN201520566014 U CN 201520566014U CN 204989371 U CN204989371 U CN 204989371U
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Abstract
The utility model provides a zero line loss of phase detection circuitry. Zero line loss of phase detection circuitry includes voltage sampling circuit and the supervisory circuits who is connected with voltage sampling circuit, voltage sampling circuit includes first input end, second input, third input and the fourth input that is connected respectively with power A looks, power B looks, power C congruence power N, and voltage sampling circuit still includes resistance R1, resistance R2 and the resistance R3 of each imbalance of resistance, and the first input end is connected through resistance R1 and supervisory circuits, and the second input is connected through resistance R2 and supervisory circuits, and the third input is connected through resistance R3 and supervisory circuits, whether the zero line trouble takes place according to the signal control of voltage sampling circuit input for supervisory circuits. Detecting the method of the zero line loss of phase, going up the divider resistance who sets up each imbalance of resistance respectively mutually at power A looks, power B congruence power C, the voltage on the N looks divider resistance that power N went up mutually is judging at 0 o'clock the zero line loss of phase.
Description
Technical field
The utility model relates to Low Voltage Electrical Apparatus, particularly a kind of zero line open-phase detection circuit.
Background technology
In the electric power system of three-phase four-wire system, if zero line has broken, its consequence makes the current potential of zero line be not equal to 0 when threephase load is uneven, and that is neutral point offsets, and now probably electric shock accidents occurs.
At present, major part adopts the protector of the three-phase four-wire system mode of connection to measure the break method of phase of zero line to be: one, and protector working power adopts the voltage between live wire and zero line; when zero line breaks mutually; protector quits work, and relay disconnects, the whole feed circuit of final disconnection.The method reliability is high, but versatility is not high, and such as in the circuit of the three-phase three-wire system mode of connection, this protector just cannot use.Two, another kind method carries out vector calculating to power supply A phase, power supply B phase and power supply C phase voltage, and whether equally compare with the vector voltage of power supply N phase, the drawback of this method is, when the three-phase voltage of electrical network is in perfect condition, namely power supply A phase, power supply B phase and power supply C phase three-phase voltage vector equal 0 or close to 0 time, without judgement whether mutually zero line, the vector voltage of power supply N phase is 0 forever, the disconnected phase of zero line therefore cannot be detected in this state.
Summary of the invention
The purpose of this utility model is the defect overcoming prior art, provides a kind of structure simple, highly versatile, reliable and stable zero line open-phase detection circuit and detect zero line and to break the method for phase.
For achieving the above object, the utility model have employed following technical scheme:
A kind of zero line open-phase detection circuit, the supervisory circuit comprising voltage sampling circuit and be connected with voltage sampling circuit; Described voltage sampling circuit comprises the first input end, the second input end, the 3rd input end and the four-input terminal that are connected with power supply N with power supply A phase, power supply B phase, power supply C phase respectively, voltage sampling circuit also comprises each unequal resistance R1 of resistance, resistance R2 and resistance R3, first input end is connected with supervisory circuit through resistance R1, second input end is connected with supervisory circuit through resistance R2,3rd input end is connected with supervisory circuit through resistance R3, and voltage sampling circuit is also to the N phase voltage signal of supervisory circuit out-put supply N phase.
Further, described voltage sampling circuit also comprises resistance R5, resistance R6 and resistance R7; One end after described resistance R1 connects with resistance R5 is connected with first input end, and the other end is connected with circuit ground GND, and the intermediate node of resistance R1 and resistance R5 is connected to the input end of supervisory circuit; One end after described resistance R2 connects with resistance R6 is connected with the second input end, and the other end is connected with circuit ground GND, and the intermediate node of resistance R2 and resistance R6 is connected to the input end of rectification circuit; One end after described resistance R3 connects with resistance R7 is connected with the 3rd input end, and the other end is connected with circuit ground GND, and the intermediate node of resistance R3 and resistance R7 is connected to the input end of supervisory circuit; Described resistance R1 and resistance R5, resistance R2 and resistance R6 and the resistance sum between resistance R3 and resistance R7 each unequal.
Further, described voltage sampling circuit also comprises resistance R4, and four-input terminal is connected with supervisory circuit through resistance R4.
Further, described voltage sampling circuit also comprises resistance R8; One end after described resistance R8 connects with resistance R4 is connected with four-input terminal, and the other end is connected with circuit ground GND, and the intermediate node of resistance R4 and resistance R8 is connected to the input end of supervisory circuit.
Further, also comprise rectification circuit, described rectification circuit is located between voltage sampling circuit and supervisory circuit, the input end of rectification circuit is connected with the output terminal of voltage sampling circuit, the output terminal of rectification circuit is connected with supervisory circuit, and rectification circuit exports to supervisory circuit after the voltage signal of voltage sampling circuit collection is rectified into DC voltage.
Further, described supervisory circuit can be set to microcontroller.
Further, all elements of described zero line open-phase detection circuit are welded on the wiring board of detected equipment.
Further, zero line open-phase detection circuit is arranged on relay.
Further, judge that when the N phase voltage signal of power supply N phase is 0 zero line breaks phase.
Further, when the N phase voltage signal of power supply N phase is not 0, and on power supply A phase, power supply B phase and this three-phase of power supply C phase divider resistance voltage vector and judge zero line mutually disconnected or imperfect earth when being not equal to the voltage of N phase voltage signal.
The utility model accesses zero line open-phase detection circuit in three-phase circuit, the supervisory circuit that zero line open-phase detection circuit comprises voltage sampling circuit and is connected with voltage sampling circuit, each for resistance unequal divider resistance is linked into power supply A phase by voltage sampling circuit respectively, power supply B phase and power supply C phase, destroy the desirable balance state of three-phase voltage, make circuit three-phase voltage vector sum may be zero at no time, therefore the whether disconnected phase of zero line also can be detected when the three-phase voltage of electrical network is in desirable balance state, by detecting whether N phase voltage is zero, zero line can be detected and whether there is fault, what working power of the present utility model adopted is three-phase line voltage, and can access in three-phase and four-line circuit and phase three-wire three circuit, compatible performance is good.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the utility model zero line open-phase detection circuit;
Fig. 2 is the utility model three-phase voltage and N phase vector directional diagram.
Embodiment
Below in conjunction with the embodiment that accompanying drawing 1 to 2 provides, further illustrate zero line open-phase detection circuit of the present utility model and detect zero line and to break the embodiment of method of phase.Zero line open-phase detection circuit of the present utility model and detect the break method of phase of zero line and be not limited to the description of following examples.
As shown in Figure 2, whether a kind of to detect the break method of phase of zero line be carry out vector calculating to power supply A phase, power supply B phase and power supply C phase voltage, and compare equal with the vector voltage of power supply N phase.This method is when the three-phase voltage of electrical network is in perfect condition, namely power supply A phase, power supply B phase and power supply C phase three-phase voltage vector equal 0 or close to 0 time, without judgement whether mutually, the vector voltage of power supply N phase is 0 to zero line forever, cannot detect the whether disconnected phase of zero line.
As shown in Figure 2, in three phase lines, any voltage between phase line and zero line is phase voltage, voltage in three phase lines between any two is line voltage, line voltage is the vector of two phase phase voltages, the phase of described three-phase voltage 120 degree, described three-phase vector voltage refers to that circuit ground GND is respectively towards power supply A phase, power supply B phase, the vector voltage of power supply C phase, N phase vector voltage refers to that the vector voltage of circuit ground GND towards power supply N phase is (when three-phase voltage is in perfect condition, N phase vector voltage is 0), described three-phase voltage vector refers to that three-phase vector voltage decomposes the vector voltage sum on N phase vector voltage direction respectively.
As shown in Figure 1, the utility model zero line open-phase detection circuit, the supervisory circuit comprising voltage sampling circuit and be connected with voltage sampling circuit.Described voltage sampling circuit comprises the first input end, the second input end, the 3rd input end and the four-input terminal that are connected with power supply N with power supply A phase, power supply B phase, power supply C phase respectively, voltage sampling circuit also comprises each unequal resistance R1 of resistance, resistance R2 and resistance R3, first input end is connected with supervisory circuit through resistance R1, second input end is connected with supervisory circuit through resistance R2, and the 3rd input end is connected with supervisory circuit through resistance R3; Whether the signal monitoring that supervisory circuit inputs according to voltage sampling circuit there is system zero-line failure.Judge that zero line breaks phase when N phase voltage is zero, when N phase voltage is non-vanishing and then judge the disconnected phase of zero line or imperfect earth when being not equal to power supply A phase, power supply B phase, this three-phase voltage vector of power supply C phase, zero line can be detected and whether there is fault.The utility model accesses zero line open-phase detection circuit in three-phase circuit, the supervisory circuit that zero line open-phase detection circuit comprises voltage sampling circuit and is connected with voltage sampling circuit, each for resistance unequal divider resistance is linked into power supply A phase by voltage sampling circuit respectively, power supply B phase and power supply C phase, destroy the desirable balance state of three-phase voltage, make circuit three-phase voltage vector sum may be zero at no time, therefore the whether disconnected phase of zero line also can be detected when the three-phase voltage of electrical network is in desirable balance state, by detecting whether N phase voltage is zero, zero line can be detected and whether there is fault, what working power of the present utility model adopted is three-phase line voltage, and can access in three-phase and four-line circuit and phase three-wire three circuit, compatible performance is good.
Judge whether N phase voltage is 0, only needing to access simple comparator circuit can realize easily.When N phase voltage is 0, zero line breaks phase; When N phase voltage is not 0, need the vector voltage of the vector of calculating three-phase voltage and N phase whether equal, then judge the disconnected phase of zero line or imperfect earth as unequal.The supervisory circuit calculating the vector computing of the three-phase voltage of zero line open-phase detection circuit can be realized by microprocessor, and the vector computing of three-phase voltage also can be realized by available circuit.
When supervisory circuit is adopted as microprocessor, accessible rectification circuit, described rectification circuit is located between voltage sampling circuit and supervisory circuit, the input end of rectification circuit is connected with the output terminal of voltage sampling circuit, the output terminal of rectification circuit is connected with supervisory circuit, and rectification circuit exports to supervisory circuit after the voltage signal of voltage sampling circuit collection is rectified into DC voltage.
As shown in Figure 1, described voltage sampling circuit also comprises resistance R5, resistance R6 and resistance R7; One end after described resistance R1 connects with resistance R5 is connected with first input end, and the other end is connected with circuit ground GND, and the intermediate node of resistance R1 and resistance R5 is connected to the input end of supervisory circuit; One end after described resistance R2 connects with resistance R6 is connected with the second input end, and the other end is connected with circuit ground GND, and the intermediate node of resistance R2 and resistance R6 is connected to the input end of rectification circuit; One end after described resistance R3 connects with resistance R7 is connected with the 3rd input end, and the other end is connected with circuit ground GND, and the intermediate node of resistance R3 and resistance R7 is connected to the input end of supervisory circuit; Described resistance R1 and resistance R5, resistance R2 and resistance R6 and the resistance sum between resistance R3 and resistance R7 each unequal.
As shown in Figure 1, described voltage sampling circuit also comprises resistance R4, and four-input terminal is connected with supervisory circuit through resistance R4.Voltage sampling circuit accesses resistance R4 after being connected with power supply N, make power supply N phase voltage when imperfect earth non-vanishing, when N phase voltage is not 0, by calculating, whether three-phase voltage vector voltage is equal with N phase vector voltage judges whether zero line exists imperfect earth.Described voltage sampling circuit also comprises resistance R8; One end after described resistance R8 connects with resistance R4 is connected with four-input terminal, and the other end is connected with circuit ground GND, and the intermediate node of resistance R4 and resistance R8 is connected to the input end of supervisory circuit.
In embodiment illustrated in fig. 1, realize destroying three-phase voltage equilibrium state by the resistance that access resistance is larger, the resistance of resistance R1, resistance R2 and resistance R3 is respectively 1M, 2M and 3M, and the resistance of resistance R4 is 1M, and the resistance of resistance R5, resistance R6, resistance R7 and resistance R8 is all 1K.The resistance of each resistance can be set to other values as required, if resistance R1 and resistance R5, resistance R2 and resistance R6 and the resistance sum between resistance R3 and resistance R7 each unequal.
As shown in Figure 1, the utility model detects zero line and to break the method for phase, comprises the steps:
(1), power supply A phase, power supply B phase and power supply C phase arrange resistance each unequal divider resistance respectively, judge that when the voltage on the N phase divider resistance in power supply N phase is 0 zero line breaks phase.
(2), when the voltage on the N phase divider resistance in power supply N phase is not 0, the voltage vector calculating divider resistance on power supply A phase, power supply B phase and this three-phase of power supply C phase and the voltage whether equaled on N phase divider resistance, then judge the disconnected phase of zero line or imperfect earth as unequal.
Particularly, A phase-voltage measurement a point can be provided with between resistance R1 and resistance R5, be provided with B phase-voltage measurement b point between resistance R2 and resistance R6, between resistance R3 and resistance R7, be provided with C phase-voltage measurement c point, between resistance R4 and resistance R8, be provided with N phase-voltage measurement n point;
A, voltage sampling circuit collects the vector voltage U1 of A phase-voltage measurement a point respectively, the vector voltage U3 of the vector voltage U2 of B phase-voltage measurement b point, C phase-voltage measurement c point and the vector voltage U4 of N phase-voltage measurement n point;
B, vector voltage U1, vector voltage U2, vector voltage U3, vector voltage U4 reads microprocessor after finishing circuit rectification, microprocessor vector computing is carried out to the three-phase voltage numerical value that obtains of sampling and and zero line vector voltage compare and judge, calculate whether system zero-line failure occurs.
C, when micro-process detects that vector voltage U4 equals 0, zero line breaks phase, and microprocessor sends signal cut circuit;
D, when micro-process detects that vector voltage U4 is not equal to 0, microprocessor is to vector voltage U1, and vector voltage U2, vector voltage U3 carries out vector computing, and compares with vector voltage U4 and judge.
E, as vector voltage U1, the vector of vector voltage U2, vector voltage U3 is equal with vector voltage U4, and zero line is mutually not disconnected or do not have imperfect earth;
The vector of f, vector voltage U1, vector voltage U2, vector voltage U3 and the vector of vector voltage U4 unequal, there is imperfect earth in zero line.
By above-mentioned known, zero line open-phase detection circuit can be applied in all phase three-wire threes or three-phase and four-line has on the equipment of measuring voltage function, only needs all for zero line open-phase detection circuit elements to be welded on the wiring board of detected equipment.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, some simple deduction or replace can also be made, all should be considered as belonging to protection domain of the present utility model.
Claims (8)
1. a zero line open-phase detection circuit, is characterized in that: the supervisory circuit comprising voltage sampling circuit and be connected with voltage sampling circuit; Described voltage sampling circuit comprises the first input end, the second input end, the 3rd input end and the four-input terminal that are connected with power supply N with power supply A phase, power supply B phase, power supply C phase respectively, voltage sampling circuit also comprises each unequal resistance R1 of resistance, resistance R2 and resistance R3, first input end is connected with supervisory circuit through resistance R1, second input end is connected with supervisory circuit through resistance R2,3rd input end is connected with supervisory circuit through resistance R3, and voltage sampling circuit is also to the N phase voltage signal of supervisory circuit out-put supply N phase.
2. zero line open-phase detection circuit according to claim 1, is characterized in that: described voltage sampling circuit also comprises resistance R5, resistance R6 and resistance R7; One end after described resistance R1 connects with resistance R5 is connected with first input end, and the other end is connected with circuit ground GND, and the intermediate node of resistance R1 and resistance R5 is connected to the input end of supervisory circuit; One end after described resistance R2 connects with resistance R6 is connected with the second input end, and the other end is connected with circuit ground GND, and the intermediate node of resistance R2 and resistance R6 is connected to the input end of rectification circuit; One end after described resistance R3 connects with resistance R7 is connected with the 3rd input end, and the other end is connected with circuit ground GND, and the intermediate node of resistance R3 and resistance R7 is connected to the input end of supervisory circuit; Described resistance R1 and resistance R5, resistance R2 and resistance R6 and the resistance sum between resistance R3 and resistance R7 each unequal.
3. zero line open-phase detection circuit according to claim 1 and 2, is characterized in that: described voltage sampling circuit also comprises resistance R4, and four-input terminal is connected with supervisory circuit through resistance R4.
4. zero line open-phase detection circuit according to claim 3, is characterized in that: described voltage sampling circuit also comprises resistance R8; One end after described resistance R8 connects with resistance R4 is connected with four-input terminal, and the other end is connected with circuit ground GND, and the intermediate node of resistance R4 and resistance R8 is connected to the input end of supervisory circuit.
5. zero line open-phase detection circuit according to claim 1, it is characterized in that: also comprise rectification circuit, described rectification circuit is located between voltage sampling circuit and supervisory circuit, the input end of rectification circuit is connected with the output terminal of voltage sampling circuit, the output terminal of rectification circuit is connected with supervisory circuit, and rectification circuit exports to supervisory circuit after the voltage signal of voltage sampling circuit collection is rectified into DC voltage.
6. zero line open-phase detection circuit according to claim 1, is characterized in that: described supervisory circuit can be set to microcontroller.
7. zero line open-phase detection circuit according to claim 1, is characterized in that: all elements of described zero line open-phase detection circuit are welded on the wiring board of detected equipment.
8. zero line open-phase detection circuit according to claim 1, is characterized in that: zero line open-phase detection circuit is arranged on relay.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520566014.XU CN204989371U (en) | 2015-07-30 | 2015-07-30 | Zero line loss of phase detection circuitry |
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| CN201520566014.XU CN204989371U (en) | 2015-07-30 | 2015-07-30 | Zero line loss of phase detection circuitry |
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| CN204989371U true CN204989371U (en) | 2016-01-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105182177A (en) * | 2015-07-15 | 2015-12-23 | 深圳市华沃表计科技有限公司 | Method for detecting actual power grid power supply state in three-phase meter zero line breaking condition |
-
2015
- 2015-07-30 CN CN201520566014.XU patent/CN204989371U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105182177A (en) * | 2015-07-15 | 2015-12-23 | 深圳市华沃表计科技有限公司 | Method for detecting actual power grid power supply state in three-phase meter zero line breaking condition |
| CN105182177B (en) * | 2015-07-15 | 2018-06-01 | 深圳市华沃表计科技有限公司 | A kind of method of actual electric network power supply state in the case of detection three-phase meter line off zero |
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