CN104749474A - Reliability detection device and reliability detection method for GFCI (ground fault circuit interrupter) module of photovoltaic grid-connected inverter - Google Patents
Reliability detection device and reliability detection method for GFCI (ground fault circuit interrupter) module of photovoltaic grid-connected inverter Download PDFInfo
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- CN104749474A CN104749474A CN201510193480.2A CN201510193480A CN104749474A CN 104749474 A CN104749474 A CN 104749474A CN 201510193480 A CN201510193480 A CN 201510193480A CN 104749474 A CN104749474 A CN 104749474A
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Abstract
The invention discloses a reliability detection device and a reliability detection method for a GFCI (ground fault circuit interrupter) module of a photovoltaic grid-connected inverter. The reliability detection device is characterized in that two wires with relays penetrate through the GFCI module at the output end of the photovoltaic grid-connected inverter additionally, and when the relays are turned off, currents in the wires are identical in size and opposite in direction. The reliability detection method is implemented on the basis of on or off of the two relays, and according to combinations of on and off states of the two relays four detection states are designed to achieve function detection of the GFCI module. The reliability detection device not only can detect whether the GFCI module is faulty or not, but also can achieve self-detection of a fault detection device, and is simple in structure, low in working frequency, high in fault judgment accuracy and reliability.
Description
Technical field
The present invention relates to a kind of photovoltaic combining inverter GFCI Module Reliability pick-up unit and method, be used for judging that can GFCI module normally work.
Background technology
For photovoltaic combining inverter, earth-fault current earth leakage protective device (GFCI) is a very important module, GFCI module can normally work concerning guarantee the reliable and stable operation of inverter and personal safety all extremely important.
Summary of the invention
The present invention discloses a kind of photovoltaic combining inverter GFCI Module Reliability pick-up unit and method, ensures single-phase photovoltaic grid-connected inverter and the reliable and stable operation of three-phase photovoltaic grid-connected inverting device.
The scheme that the present invention solve the technical problem is:
A kind of photovoltaic combining inverter GFCI Module Reliability pick-up unit and method, this device comprises a low-voltage dc power supply, two relays, resistance, wire that two resistances are equal, and this device penetrates two wires with relay in photovoltaic combining inverter output terminal Ground leakage current detection module GFCI.
As improvement, low-voltage dc power supply positive pole two relays in parallel, then to penetrate after GFCI module coil resistance in series respectively by two wires, are finally connected to DC power cathode, and it is contrary that two wires penetrate GFCI module coil direction.
As improvement, detection method implements based on the disconnection or close of two relays, the switch combination of two relays has four kinds of detected states, GFCI module samples electric current under each detected state and known analog leakage current are compared, to realize the Function detection to GFCI module, breakdown judge is carried out to GFCI module and carried out before grid-connected inverters.
The invention has the beneficial effects as follows, this pick-up unit, except can detecting GFCI module and whether having fault, also can realize the detection of failure detector self, and the present invention can make the judgement of GFCI module to fault more accurate.This reliability detecting device is not only applicable to single-phase photovoltaic grid-connected inverter GFCI module, is applicable to three-phase photovoltaic grid-connected inverting device GFCI module yet.Because GFCI Module Reliability structure of the detecting device is simple, components and parts are little, and two relays only need once close and turn off operation before start, and frequency of operation is very low, and the reliability of GFCI module failure pick-up unit is very high.
Accompanying drawing explanation
Fig. 1 is GFCI Module Reliability pick-up unit schematic diagram.
In accompanying drawing, L, N represent live wire and the zero line of civil power respectively; Relay1, Relay2 represent relay, and R represents the resistance of fixed resistance value, and Vcc represents low-voltage dc power supply positive pole; Gnd represents low-voltage dc power supply negative pole, and GFCI represents earth-fault current earth leakage protective device.Stain in figure represents and is interconnected between cross spider; The flow direction of electric current when arrow in figure represents relay closes.
Embodiment
In combining inverter GFCI detecting coil except penetrating civil power live wire and zero line wire, additionally penetrate the wire that two current directions are contrary, flow through GFCI when relay R elay1 closes and detect and to flow through GFCI when the electric current of coil and relay R elay2 close to detect the size of current equal direction of coil contrary.
During photovoltaic inverter grid-connected, reliability detecting device detection of end.Detection method implements based on the disconnection or close of two relays, have four kinds of detected states: 1, relay R elay1 and relay R elay2 does not close, civil power live wire and zero line do not have electric current to flow through yet, and the electric current that GFCI module is now detected should be zero; 2, when Relay1 closes, when Relay2 disconnects, just creating an amplitude in GFCI coil is V
cCthe analog current of/R, by comparing sampled current value and the V of GFCI module
cCwhether accurate/R value, just can judge that GFCI module detects the leakage current in a direction; 3, when Relay1 disconnects, when Relay2 closes, can create an amplitude in GFCI coil is V
cCthe analog current of/R, but the direction of now analog current inflow GFCI coil is contrary with the direction of current of detected state 2, by comparing sampled current value and the V of GFCI module
cCwhether accurate/R value, can judge that GFCI module detects the leakage current in another direction; 4, when Relay1 closes, when Relay2 also closes, just creating two amplitudes in GFCI coil is V
cC/ R but the contrary analog current in direction, now the sampled current value of GFCI module should be identical with detected state 1.
Visible, if GFCI module has fault, just can be detected before combining inverter start is grid-connected.Reliability detecting device comprises the identical resistance of two relays, two resistances and a low-voltage dc power supply, and when these components and parts break down, according to above-mentioned detection method, fault also can be detected, and is to occur with the form of GFCI fault.
Claims (3)
1. a photovoltaic combining inverter GFCI Module Reliability pick-up unit and method, it is characterized in that: this device comprises a low-voltage dc power supply, two relays, resistance, wire that two resistances are equal, and this device penetrates two wires with relay in photovoltaic combining inverter output terminal Ground leakage current detection module GFCI.
2. a kind of photovoltaic combining inverter GFCI Module Reliability pick-up unit according to claim 1 and method, it is characterized in that: low-voltage dc power supply positive pole two relays in parallel, resistance in series is distinguished after penetrating GFCI module coil by two wires again, finally be connected to DC power cathode, it is contrary that two wires penetrate GFCI module coil direction.
3. a kind of photovoltaic combining inverter GFCI Module Reliability pick-up unit according to claim 1 and method, it is characterized in that: breakdown judge is carried out to GFCI module and carried out before grid-connected inverters, detection method implements based on the disconnection or close of two relays, the switch combination of two relays has four kinds of detected states, GFCI module samples electric current under each detected state and known analog leakage current are compared, to realize the Function detection to GFCI module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510193480.2A CN104749474B (en) | 2015-04-22 | 2015-04-22 | A kind of photovoltaic combining inverter GFCI Module Reliabilities detection means and method |
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| CN201510193480.2A CN104749474B (en) | 2015-04-22 | 2015-04-22 | A kind of photovoltaic combining inverter GFCI Module Reliabilities detection means and method |
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| CN104749474B CN104749474B (en) | 2017-07-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111856192A (en) * | 2020-07-31 | 2020-10-30 | 深圳市德恒科技有限公司 | No load check out test set |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111856192A (en) * | 2020-07-31 | 2020-10-30 | 深圳市德恒科技有限公司 | No load check out test set |
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Effective date of registration: 20170623 Address after: 313000 Wuxing City, Huzhou province Huzhou District No. 2 East Road, No. 759, No. Applicant after: Huzhou Teachers College Address before: Yang Shu Lu Wuxing District 313000 Zhejiang city of Huzhou province No. 18 Applicant before: ZHEJIANG QIAOXING CONSTRUCTION GROUP HUZHOU INTELLIGENT TECHNOLOGY CO., LTD. |
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