CN210111586U - Ground insulation protection circuit for grounded photovoltaic module - Google Patents
Ground insulation protection circuit for grounded photovoltaic module Download PDFInfo
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- CN210111586U CN210111586U CN201921305430.9U CN201921305430U CN210111586U CN 210111586 U CN210111586 U CN 210111586U CN 201921305430 U CN201921305430 U CN 201921305430U CN 210111586 U CN210111586 U CN 210111586U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The utility model discloses a ground insulation protection circuit for a grounding photovoltaic module, which comprises a direct current sampling resistor, a small-resistance grounding resistor, a large-resistance grounding resistor and a grounding fuse; the direct current sampling resistor is connected with the photovoltaic module in parallel, the large-resistance grounding resistor is connected between a grounding electrode of the photovoltaic module and the ground, one end of the small-resistance grounding resistor is connected with the grounding electrode of the photovoltaic module, the other end of the small-resistance grounding resistor is connected with the ground after being connected with the grounding fuse in series, and the resistance of the small-resistance grounding resistor is smaller than that of the large-resistance grounding resistor. The utility model discloses can implement the protection fast, accurately when taking place ground fault to detect out the insulation resistance value of a non-ground connection utmost point at any time.
Description
Technical Field
The utility model belongs to the photovoltaic power generation field, in particular to ground insulation protection circuit.
Background
With the large-scale application of photovoltaic power generation systems, the ground insulation detection and protection device of the photovoltaic module becomes an indispensable part of the photovoltaic power generation systems. However, for a photovoltaic system which needs to be grounded in a single pole like an amorphous silicon thin film module, there is no reliable and uniform method for rapidly protecting and detecting the insulation resistance value when a ground fault occurs.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem that above-mentioned background art mentioned, the utility model provides a to ground insulation protection circuit to ground connection photovoltaic module.
In order to realize the technical purpose, the utility model discloses a technical scheme does:
a ground insulation protection circuit for a grounded photovoltaic module is characterized in that the photovoltaic module is grounded in a single pole and comprises a direct current sampling resistor, a small-resistance ground resistor, a large-resistance ground resistor and a grounding fuse; the direct current sampling resistor is connected with the photovoltaic module in parallel, the large-resistance grounding resistor is connected between a grounding electrode of the photovoltaic module and the ground, one end of the small-resistance grounding resistor is connected with the grounding electrode of the photovoltaic module, the other end of the small-resistance grounding resistor is connected with the ground after being connected with the grounding fuse in series, and the resistance of the small-resistance grounding resistor is smaller than that of the large-resistance grounding resistor.
Further, the resistance interval of the small-resistance grounding resistor is (0, 500K Ω); the resistance interval of the large-resistance grounding resistor is (500K omega, 10M omega).
Further, the power of the ground resistor with the small resistance value is larger than that of the ground resistor with the large resistance value.
Further, the direct current sampling resistor, the small-resistance ground resistor and/or the large-resistance ground resistor are connected in series and/or in parallel by a plurality of resistors.
Further, the direct current sampling resistor comprises a first sampling resistor and a second sampling resistor which are connected in series, the small-resistance ground resistor comprises a first small-resistance resistor and a second small-resistance resistor which are connected in series, and the large-resistance ground resistor comprises a first large-resistance resistor and a second large-resistance resistor which are connected in series; the first sampling resistor, the first small-resistance resistor and the first large-resistance resistor are directly connected with the grounding electrode of the photovoltaic module respectively.
Adopt the beneficial effect that above-mentioned technical scheme brought:
(1) in the ground insulation protection circuit designed by the utility model, the larger the grounding current is, the faster the disconnection speed is due to the characteristics of the fuse, thereby preventing the grounding resistance with small resistance from being burnt; the smaller the grounding current is, the slower the disconnection speed is, thereby preventing the malfunction caused by the interference;
(2) through the ground insulation protection circuit designed by the utility model, whether the fuse is disconnected or not can be judged, and the worker is informed to carry out troubleshooting and replace the fuse in time when the fuse is disconnected, so that the problem that the photovoltaic module is not reliably grounded for a long time due to the fact that the worker does not know that the fuse is disconnected is avoided, and the service life and the power generation efficiency of the photovoltaic module are influenced;
(3) through the utility model discloses an insulation protection circuit to ground can both detect the insulation resistance of photovoltaic module non-earthing pole under the condition of fuse disconnection and disconnection, makes the insulating condition of staff understanding non-earthing pole constantly.
Drawings
Fig. 1 is a circuit topology diagram of the present invention when the negative electrode of the photovoltaic module is grounded;
fig. 2 is a circuit topology diagram of the present invention when the positive electrode of the photovoltaic module is grounded.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.
The utility model discloses a to ground connection photovoltaic module's insulating protection circuit to ground, photovoltaic module unipolar ground, circuit include direct current sampling resistance Rx, little resistance ground resistance Rz, big resistance ground resistance Ry and ground connection fuse Fu. The utility model adopts a mode of grounding the small-resistance grounding resistor Rz and the large-resistance grounding resistor Ry in parallel, and the Rz is far less than the Ry, specifically, the Rz belongs to (0, 500K omega), the Ry belongs to (500K omega, 10M omega),
therefore, the photovoltaic module can be reliably grounded when no fault exists.
In the present embodiment, the dc sampling resistor Rx includes a resistor Rx1 and a resistor Rx2 connected in series; the small-resistance grounding resistor Rz comprises a resistor Rz1 and a resistor Rz2 which are connected in series; the large-value ground resistor Ry comprises a resistor Ry1 and a resistor Ry2 which are connected in series.
As shown in fig. 1, for a photovoltaic module requiring negative grounding, resistors Rx2 and Rx1 are connected in series and connected in parallel with the photovoltaic module, wherein Rx2 is connected with the positive pole, and Rx1 is connected with the negative pole; resistors Ry1 and Ry2 are connected in series between the negative electrode and the ground, wherein Ry1 is connected with the negative electrode, and Ry2 is connected with the ground; the resistors Rz1 and Rz2 are connected in series with the ground fuse Fu between the negative electrode and the ground, Rz1 is connected to the negative electrode, and Rz2 is connected to the Fu.
As shown in fig. 2, for a photovoltaic module requiring positive grounding, resistors Rx1 and Rx2 are connected in series and connected with the photovoltaic module in parallel, wherein Rx1 is connected with the positive pole, and Rx2 is connected with the negative pole; resistors Ry1 and Ry2 are connected in series between the anode and the ground, wherein Ry1 is connected with the anode, and Ry2 is connected with the ground; rz1, Rz2 and the grounding fuse Fu are connected in series between the positive electrode and the ground, Rz1 is connected to the positive electrode, and Rz2 is connected to the Fu.
The resistance used for voltage division and sampling in the direct current sampling resistance Rx is Rx1, the resistance used for voltage division and sampling in the small-resistance grounding resistance Rz is Rz1, and the resistance used for voltage division and sampling in the large-resistance grounding resistance Ry is Ry 1. The voltage values across Rx1, Rz1, and Ry1 are sampled values, and are Vx, Vz, and Vy, respectively.
When the non-grounding electrode of the photovoltaic module has the insulation resistance RL, if the RL is large, the grounding current flowing through Rz1, Rz2 and Fu is small, so that the fuse Fu is not disconnected, and because the current flowing through Ry1 and Ry2 is smaller, the power of the resistors Ry1 and Ry2 is generally selected to be small, and the power of the resistors Rz1 and Rz2 is selected to be large.
When the insulation resistance RL is less than a certain value, the ground current flowing through Rz1, Rz2, Fu is large, causing the fuse Fu to open. At this time, the grounding current only flows through Ry1 and Ry2, and because the resistances of Ry1 and Ry2 are large, the grounding current becomes small, so that the aim of limiting the grounding current is achieved, but because the grounding resistance is large, the component is not reliably grounded.
As can be seen from the above process, whether the fuse Fu is disconnected or not can be determined by detecting Vz and Vy. When the fuse Fu is not opened, the current flowing through Ry1 and Ry2 is smaller than the current flowing through Rz1 and Rz2, that is, the current flows through Rz2When the fuse Fu is opened, no current flows in Rz1 and Rz2, and thus current flows in Rz1 and Rz2
Namely Vy Rz1>Vz×Ry1。
The ground current is no matter whether the fuse is disconnected or not
The direct voltage of the assembly is
Voltage across RL is
So that the insulation resistance
The above operation process may be implemented by a processor in actual operation. Through the utility model provides an insulating protection circuit to ground can prevent because insulation resistance descends, and the too big photovoltaic module efficiency that leads to of earth current descends, and the generated energy descends, generates heat, burns out the device, accidents such as explosion can the protection personnel owing to touching the personal accident that a non-ground connection extremely leads to moreover.
The embodiment is only for explaining the technical thought of the utility model, can not limit with this the utility model discloses a protection scope, all according to the utility model provides a technical thought, any change of doing on technical scheme basis all falls into the utility model discloses within the protection scope.
Claims (5)
1. The utility model provides an insulating protection circuit to ground photovoltaic module, photovoltaic module unipolar ground which characterized in that: the device comprises a direct current sampling resistor, a small-resistance grounding resistor, a large-resistance grounding resistor and a grounding fuse; the direct current sampling resistor is connected with the photovoltaic module in parallel, the large-resistance grounding resistor is connected between a grounding electrode of the photovoltaic module and the ground, one end of the small-resistance grounding resistor is connected with the grounding electrode of the photovoltaic module, the other end of the small-resistance grounding resistor is connected with the ground after being connected with the grounding fuse in series, and the resistance of the small-resistance grounding resistor is smaller than that of the large-resistance grounding resistor.
2. The ground insulation protection circuit for the grounded photovoltaic module according to claim 1, wherein: the resistance interval of the small-resistance grounding resistor is (0, 500K omega); the resistance interval of the large-resistance grounding resistor is (500K omega, 10M omega).
3. The ground insulation protection circuit for the grounded photovoltaic module according to claim 1, wherein: the power of the ground resistor with the small resistance value is larger than that of the ground resistor with the large resistance value.
4. The ground insulation protection circuit for the grounded photovoltaic module according to claim 1, wherein: the direct current sampling resistor, the small-resistance grounding resistor and/or the large-resistance grounding resistor are connected in series and/or in parallel.
5. The ground insulation protection circuit for the grounded photovoltaic module as recited in claim 4, wherein: the direct-current sampling resistor comprises a first sampling resistor and a second sampling resistor which are connected in series, the small-resistance grounding resistor comprises a first small-resistance resistor and a second small-resistance resistor which are connected in series, and the large-resistance grounding resistor comprises a first large-resistance resistor and a second large-resistance resistor which are connected in series; the first sampling resistor, the first small-resistance resistor and the first large-resistance resistor are directly connected with the grounding electrode of the photovoltaic module respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921305430.9U CN210111586U (en) | 2019-08-13 | 2019-08-13 | Ground insulation protection circuit for grounded photovoltaic module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921305430.9U CN210111586U (en) | 2019-08-13 | 2019-08-13 | Ground insulation protection circuit for grounded photovoltaic module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210111586U true CN210111586U (en) | 2020-02-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921305430.9U Active CN210111586U (en) | 2019-08-13 | 2019-08-13 | Ground insulation protection circuit for grounded photovoltaic module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210111586U (en) |
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2019
- 2019-08-13 CN CN201921305430.9U patent/CN210111586U/en active Active
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