CN214958695U - High-voltage safety isolation device with non-fuse realizing protection function - Google Patents
High-voltage safety isolation device with non-fuse realizing protection function Download PDFInfo
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- CN214958695U CN214958695U CN202023339069.7U CN202023339069U CN214958695U CN 214958695 U CN214958695 U CN 214958695U CN 202023339069 U CN202023339069 U CN 202023339069U CN 214958695 U CN214958695 U CN 214958695U
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Abstract
The utility model provides a high pressure safety isolating device with non-fuse realizes protect function, it includes high-voltage capacitor, protection module, take electric isolation to get the electric unit, first wire, second wire and third wire, any one in the A, B, C three phases of the one end of first wire and power line is connected, the other end and the input of high-voltage capacitor of first wire are connected, high-voltage capacitor's output is connected with the one end of second wire, the other end and protection module's one end of second wire are connected, protection module connects at both ends and gets two of electric unit and get the electric end, it is used for connecting intelligent switch's intelligent measurement and control unit to get the electric unit, the one end of third wire is connected with the other end of getting the electric unit, the other end ground connection of third wire. The utility model discloses keeping the switch volume unchangeable, and under the unable condition of installing the fuse, can realize the high voltage isolation under the high-voltage capacitor breakdown state, can prevent the emergence of electric shock accident.
Description
Technical Field
The utility model relates to a distribution automation technical field especially relates to a high-pressure safety isolating device with non-fuse realizes protect function.
Background
At present, the capacitor power-taking and power-distribution automatic switch gradually becomes a main-stream column switch due to the fact that the capacitor power-taking and power-distribution automatic switch avoids the defects of explosion and the like of the traditional PT.
However, because the volume of the pole is limited, the arrangement of a fuse in the power-taking circuit is not considered. Therefore, once the high-voltage capacitor for taking electricity has interface breakdown due to casting process and other reasons, the loop will generate large current undoubtedly. The occurrence of large current will inevitably cause the melting point of the loop.
However, if the fusing point is present in the low voltage region, a high voltage as high as the phase voltage may be present at the fusing point of the low voltage region, and thus an electric shock may occur, which is an unsafe factor.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims at providing a line is simple, simple structure, security performance is high, small, with low costs high-pressure safety isolating device that protect function is realized to non-fuse.
In order to achieve the above main object, the present invention provides a high voltage safety isolation device with non-fuse realizing protection function, which comprises a high voltage capacitor, a protection module, a power taking unit with electrical isolation, a first conducting wire, a second conducting wire and a third conducting wire, one end of the first conducting wire is connected with any one of A, B, C three phases of a power line, the other end of the first conducting wire is connected with the input end of the high-voltage capacitor, the output end of the high-voltage capacitor is connected with one end of the second lead, the other end of the second lead is connected with one end of the protection module, two ends of the protection module are connected with two power taking ends of the power taking unit, the power taking unit is used for being connected with an intelligent measurement and control unit of an intelligent switch, one end of the third wire is connected with the other end of the electricity taking unit, and the other end of the third wire is grounded; when a surge enters the first lead, the high-voltage capacitor is broken down to enter a short-circuit state, the protection module is connected to the second lead and the third lead, a current path formed by the first lead, the high-voltage capacitor, the second lead, the protection module and the third lead is conducted, and the surge flows to the ground after flowing to the first lead, the high-voltage capacitor, the second lead, the protection module and the third lead in sequence.
In a further scheme, a single-phase, two-phase or three-phase power taking mode can be selected among the high-voltage capacitor, the protection module and the power taking unit to supply power.
In a further aspect, the protection module is a voltage dependent resistor array.
In a further scheme, the power taking unit takes power by utilizing the voltage difference between two ends of the power taking unit, one power taking end of the power taking unit is connected with the high-voltage capacitor, and the other power taking end of the power taking unit is connected with the rear grounding wire of the protection module.
In a further scheme, the power taking unit comprises an isolation transformer, a rectification filter circuit and a voltage stabilizing circuit, a primary side coil of the isolation transformer is connected with two ends of the protection module, two ends of a secondary side coil of the isolation transformer are connected to the rectification filter circuit, the voltage stabilizing circuit is arranged at an output end of the rectification filter circuit, an output end of the rectification filter circuit is connected with an input end of the voltage stabilizing circuit, and an output end of the voltage stabilizing circuit is connected with an input end of the voltage conversion circuit.
In a further scheme, a damping resistor is connected to two ends of the other group of secondary side coils of the isolation transformer.
In a further scheme, the high-voltage capacitor is formed by connecting a plurality of CB81 cylindrical film capacitors with the direct-current withstand voltage number of 80kV in series.
In a further scheme, the piezoresistor array is composed of a plurality of piezoresistors connected in series, and each piezoresistor is arranged according to the creepage distance or the insulation grade distance and is sequentially connected in series on the circuit main board of the protection module.
Therefore, the utility model provides a high-pressure safety isolating device with protect function is realized to non-fuse keeps the switch volume unchangeable, and under the unable condition of installing the fuse, can realize the high-pressure isolation under the high-voltage capacitor breakdown state, can prevent the emergence of electric shock accident.
Drawings
Fig. 1 is a schematic diagram of an embodiment of the high voltage safety isolating device with a non-fuse realizing protection function of the present invention.
Fig. 2 is a schematic circuit diagram of a power-taking unit in an embodiment of a high-voltage safety isolating device with a non-fuse realizing protection function.
Fig. 3 is a schematic circuit diagram of a protection module in an embodiment of a high-voltage safety isolating device with a non-fuse realizing protection function.
The present invention will be further explained with reference to the drawings and examples.
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined below to clearly and completely describe the technical solution of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.
Referring to fig. 1, the utility model discloses a high pressure safety isolating device with non-fuse realizes protect function, including high voltage capacitor 10, protection module 20, take electric isolation get electric unit 30, first wire 1, second wire 2 and third wire 3, any one in A, B, C three phases of one end and the power line of first wire 1 is connected, the other end and the input of high voltage capacitor 10 of first wire 1 are connected, the output of high voltage capacitor 10 is connected with the one end of second wire 2, the other end and the one end of protection module 20 of second wire 2 are connected, protection module 20 both ends are connected and are got two of electric unit 30 and get the electricity end, it is used for connecting intelligent switch's intelligent measurement and control unit 40 to get electric unit 30, the one end of third wire 3 is connected with the other end of getting electric unit 30, the other end ground connection of third wire 3.
When a surge enters the first conducting wire 1, the high-voltage capacitor 10 breaks down to enter a short-circuit state, the protection module 20 is connected to the second conducting wire 2 and the third conducting wire 3, a current path formed by the first conducting wire 1, the high-voltage capacitor 10, the second conducting wire 2, the protection module 20 and the third conducting wire 3 is conducted, and the surge flows to the first conducting wire 1, the high-voltage capacitor 10, the second conducting wire 2, the protection module 20 and the third conducting wire 3 in sequence and then enters the ground.
Further, a single-phase, two-phase or three-phase power supply mode can be selected among the high-voltage capacitor 10, the protection module 20 and the power supply unit 30 for supplying power.
For example, in the three-phase current-taking mode, three high-voltage capacitors 10 are provided, and parallel connection of the three capacitors is easily achieved by providing leads on the terminal block. The terminal block can be provided with three capacitors corresponding to the three-phase capacitor C1, and the three-phase capacitor can be applied to single-phase or three-phase conditions.
In the present embodiment, the power taking unit 30 uses a voltage difference between two ends thereof to take power, one power taking end thereof is connected to the high voltage capacitor 10, and the other power taking end is connected to the protection module 20 and then is grounded.
Referring to fig. 2, the power taking unit 30 includes an isolation transformer B1, a rectification filter circuit, and a voltage stabilizing circuit, a primary side coil of the isolation transformer B1 is connected to two ends of the protection module 20, two ends of a secondary side coil of the isolation transformer B1 are connected to the rectification filter circuit, the output end of the rectification filter circuit is provided with the voltage stabilizing circuit, the output end of the rectification filter circuit is connected to the input end of the voltage stabilizing circuit, and the output end of the voltage stabilizing circuit is connected to the input end of the voltage converting circuit.
Preferably, a damping resistor is connected to both ends of the other set of secondary side coils of the isolation transformer B1.
Specifically, the voltage signal V1 is connected to one end of the high-voltage capacitor 10(C1), the other end of the high-voltage capacitor 10 is simultaneously connected to one end of the primary winding of the isolation transformer B1, the other end of the primary winding of the isolation transformer B1 is grounded, and the protection module 2020 is connected in parallel to two ends of the primary winding of the isolation transformer B1.
Two ends of a group of secondary side coils of the isolation transformer B1 are connected with two ends of a resistor R1, and the resistor R1 is the damping resistor. Two ends of a group of secondary side coils of the isolation transformer B1 are connected to the input end of a rectifier bridge circuit, the rectifier bridge circuit is a full-wave rectifier circuit formed by diodes D1-D4, a capacitor C3 is connected in parallel between the output ends of the rectifier bridge circuit, the rectifier bridge circuit formed by diodes D1-D4 and a capacitor C3 playing a role in filtering form the rectifier filter circuit.
A voltage division branch formed by connecting resistors R2-R3 in series and a voltage stabilizing device D5 are also connected in parallel between the output anode and the output cathode of the rectifier bridge circuit, and the voltage stabilizing device D5 is realized by a controllable precise voltage stabilizing source with the model number of TL 431. The cathode of the voltage stabilizing device D5 is connected with the output anode of the rectifier bridge circuit, the anode is connected with the output cathode of the rectifier bridge circuit, and the reference electrode of the voltage stabilizing device D5 is connected between the resistors R2-R3. The voltage across the voltage regulator device D5(TL431) depends on the resistance values of the resistors R2 to R3, and it is known in the art that the voltage U at the output terminal of the voltage regulator device D5 is (1+ R2/R3) · 2.5V, so that the voltage at the output terminal of the voltage regulator device D5 can be within the required operating voltage range at the input terminal of the voltage conversion circuit by adjusting the resistance values of the resistors R2 to R3. The resistors R2-R3 and the voltage stabilizing device D5 form the voltage stabilizing circuit.
The voltage of the output end of the voltage stabilizing device D5 is connected to the input end of the voltage stabilizing chip U2, the voltage stabilizing chip U2 can be realized by a common DC/DC voltage stabilizing chip sold in the market according to the power supply requirement of the power supply equipment, the voltage stabilizing chip U2 is the voltage conversion module, and the voltage signal output by the voltage stabilizing chip U2 is used for supplying power to an electrical appliance U3 (such as the intelligent measurement and control unit 40).
In this embodiment, the high-voltage capacitor 10 is formed by connecting a plurality of CB81 cylindrical film capacitors having a dc withstand voltage of 80kV in series.
It can be seen that the high-voltage capacitor 10 can be realized by using one capacitor or by using a plurality of capacitors connected in series, and the high-voltage capacitor 10 of the present embodiment uses a high-voltage ceramic capacitor, and the special series structure is suitable for long-term reliable operation under high voltage.
Specifically, the capacitor is a CB81 cylindrical film capacitor with the direct-current withstand voltage of 80kV, and the number of the capacitors connected in series in the capacitor bank is 10. The total diameter of the capacitor bank after the series connection is 70mm, the total length is 1040mm, and the total capacity of the series capacitor bank is 576 pf. The actual work requirement can be met.
The forming process of the capacitor bank is consistent with that of the line arrester, a zinc oxide valve plate in the arrester forming process is replaced by a direct-current cylindrical film capacitor, the diameter of the direct-current cylindrical film capacitor is consistent with that of the zinc oxide valve plate, and the total length after series connection is consistent with that of the zinc oxide valve plate in series connection. Therefore, the forming process of the capacitor bank is simple and easy to realize.
Further, the protection module 20 is a voltage dependent resistor array. Referring to fig. 3, the protection module includes an input terminal 100, a varistor array and an output terminal 200, where the varistor array is formed by a plurality of series-connected varistors, such as varistors RV 1-RV 30, and the varistors are arranged according to a creepage distance or an insulation grade distance and are sequentially arranged in series on a circuit board of the protection module 20.
Preferably, the piezoresistor is a metal electrooxidate piezoresistor, the reaction speed is high, the quick response time is less than 10ns, and the quick response can ensure that better protection equipment or a port is not influenced by surge current.
It can be seen that the voltage dependent resistor is an element with transient voltage suppression function, and can be used to replace the combination of the transient suppression diode, the zener diode and the capacitor. The piezoresistors can protect the circuits of ICs and other devices from damage due to electrostatic discharge, surges, and other transient currents (e.g., lightning strikes, etc.). When the voltage-sensitive resistor is used, the voltage-sensitive resistor is connected to the protected IC or equipment circuit in parallel, and when the voltage is instantaneously higher than a certain value, the resistance value of the voltage-sensitive resistor is rapidly reduced, and large current is conducted, so that the IC or electrical equipment is protected; when the voltage is lower than the working voltage value of the piezoresistor, the resistance value of the piezoresistor is extremely high and is approximately open, so that the normal work of the device or the electrical equipment is not influenced.
The protection module 20 of the embodiment adopts a piezoresistor array type, is independently made into a module, is placed at the front end of the power taking unit 30, is connected with the power taking unit 30 in parallel, can resist surge impact, particularly impact with long duration, and remarkably reduces the temperature rise of each device under extreme conditions by a processing method of dispersing concentrated heat, so that the damage of the excessive temperature rise to the device is avoided, the purpose of protecting the device is achieved, and the working reliability of the whole system is improved.
In practical application, the power-taking loop of this embodiment is specifically: the first conductor 1 is connected to a phase of the power line (e.g., phase a in the figure), and since the reactance of the high-voltage capacitor 10 is high, the voltage drop is greatly reduced after passing through the high-voltage capacitor 10. After the current has passed through the second conductor 2, there are two branches. However, under the condition that the line voltage is normal, the voltage across the protection module 20 is relatively low and does not reach the starting voltage, so that the protection module 20 does not work, that is, almost no current flows through the protection module; at this time, the current flowing out of the high-voltage capacitor 10 flows through the "electricity taking module with electric isolation", and then enters the ground through the third wire 3.
If the high-voltage capacitor 10 breaks down and short-circuits occur, the voltage across the protection module 20 will increase sharply, and the protection module 20 will start to operate immediately and start flowing current. Since the reactance of the "power-taking module with electrical isolation" is high, the current flowing through it is negligible compared to the protection module 20, and therefore the current on the wires 1, 2, 3 and 4 increases sharply when the high-voltage capacitor 10 breaks down.
If it is ensured that the entire paths of the second wire 2, the third wire 3 and the protection module 20 have enough wire diameters and are made of the same copper material, but the wire diameter of the first wire 1 is far smaller than that of the paths, when a current path composed of the first wire 1, the high-voltage capacitor 10, the second wire 2, the protection module 20 and the third wire 3 flows through a breakdown large current, the heat generation is different in unit length: if the wire diameter of the second wire 2 and the third wire 3 is 2 times that of the first wire 1, the instantaneous heat generation per unit length on the first wire 1 is 4 times that of the second wire 2 and the third wire 3, and in the case that the current is increased sharply and the wires do not reach the heat dissipation, the temperature increase on the first wire 1 is far more than that of the second wire 2 and the third wire 3 and the protection module 20, so that the first wire 1 is necessarily fused firstly. After the first lead 1 is fused, the high voltage is isolated, so that the protection module 20 which is possibly contacted and the electricity taking module with the electric isolation become safe regions, and the electric shock risk caused by the fact that the second lead 2 and the third lead 3 are blown, namely the inner conductor of the protection module 20 is eliminated.
Therefore, the utility model provides a high-pressure safety isolating device with protect function is realized to non-fuse keeps the switch volume unchangeable, and under the unable condition of installing the fuse, can realize the high-pressure isolation under the high-voltage capacitor 10 breakdown state, can prevent the emergence of electric shock accident.
Therefore, the utility model discloses output is reliable and stable: the high-voltage ceramic capacitor with high precision and high performance is adopted for voltage division, the high temperature resistance can ensure that the high-voltage ceramic capacitor can stably work in the environment of-40 ℃ to 70 ℃, and the output power is stable within the temperature range of-40 ℃ to 70 ℃, and the output power fluctuation is less than 1%.
The working mode can be configured as follows: the power supply system can be correspondingly configured according to different use scenes, and can select single-phase, two-phase and three-phase power supply modes.
Light and flexible: compared with the conventional electromagnetic energy-taking PT power supply, the weight is greatly reduced, the size is light, the installation is simple and convenient, and the installation quantity can be flexibly allocated according to actual needs.
It should be noted that the above is only the preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and all the insubstantial modifications made by using the design concept of the present invention also fall within the protection scope of the present invention.
Claims (5)
1. A high-voltage safety isolation device with a non-fuse realizing protection function is characterized by comprising:
the intelligent measurement and control device comprises a high-voltage capacitor, a protection module, a power taking unit with electrical isolation, a first lead, a second lead and a third lead, wherein one end of the first lead is connected with any one of A, B, C phases of a power line, the other end of the first lead is connected with the input end of the high-voltage capacitor, the output end of the high-voltage capacitor is connected with one end of the second lead, the other end of the second lead is connected with one end of the protection module, the two ends of the protection module are connected with two power taking ends of the power taking unit, the power taking unit is used for being connected with an intelligent measurement and control unit of an intelligent switch, one end of the third lead is connected with the other end of the power taking unit, and the other end of the third lead is grounded;
when a surge enters the first lead, the high-voltage capacitor breaks down to enter a short-circuit state, the protection module is connected to the second lead and the third lead, a current path formed by the first lead, the high-voltage capacitor, the second lead, the protection module and the third lead is conducted, and the surge flows to the first lead, the high-voltage capacitor, the second lead, the protection module and the third lead in sequence and then enters the ground;
the protection module is a piezoresistor array, the piezoresistor array is composed of a plurality of piezoresistors connected in series, and each piezoresistor is arranged according to a creepage distance or an insulation grade interval and is sequentially arranged on a circuit main board of the protection module in series;
the high-voltage capacitor is formed by connecting a plurality of CB81 cylindrical film capacitors with the direct-current withstand voltage number of 80kV in series.
2. The high voltage safety isolating device of claim 1, wherein:
the high-voltage capacitor, the protection module and the power taking unit can be powered by selecting a single-phase, two-phase or three-phase power taking mode.
3. The high voltage safety isolating device of claim 1, wherein:
the power taking unit is used for taking energy by utilizing the voltage difference between two ends of the power taking unit, one power taking end of the power taking unit is connected with the high-voltage capacitor, and the other power taking end of the power taking unit is connected with the rear grounding wire of the protection module.
4. The high voltage safety isolating device of claim 3, wherein:
the power taking unit comprises an isolation transformer, a rectification filter circuit and a voltage stabilizing circuit, a primary side coil of the isolation transformer is connected with two ends of the protection module, two ends of a secondary side coil of the isolation transformer are connected to the rectification filter circuit, the voltage stabilizing circuit is arranged at the output end of the rectification filter circuit, the output end of the rectification filter circuit is connected with the input end of the voltage stabilizing circuit, and the output end of the voltage stabilizing circuit is connected with the input end of the voltage conversion circuit.
5. The high voltage safety isolating device of claim 4, wherein:
and two ends of the other group of secondary side coils of the isolation transformer are connected with damping resistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023339069.7U CN214958695U (en) | 2020-12-30 | 2020-12-30 | High-voltage safety isolation device with non-fuse realizing protection function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023339069.7U CN214958695U (en) | 2020-12-30 | 2020-12-30 | High-voltage safety isolation device with non-fuse realizing protection function |
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| CN214958695U true CN214958695U (en) | 2021-11-30 |
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| CN202023339069.7U Active CN214958695U (en) | 2020-12-30 | 2020-12-30 | High-voltage safety isolation device with non-fuse realizing protection function |
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