CN213817336U - Dual-power switching device - Google Patents
Dual-power switching device Download PDFInfo
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- CN213817336U CN213817336U CN202022110779.6U CN202022110779U CN213817336U CN 213817336 U CN213817336 U CN 213817336U CN 202022110779 U CN202022110779 U CN 202022110779U CN 213817336 U CN213817336 U CN 213817336U
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Abstract
The utility model discloses a double power supply switching device, which is characterized in that the double power supply switching device comprises a main power supply and a standby power supply, wherein the main power supply is connected with a coil of an auxiliary control relay and a coil of a main power supply switching relay, and the standby power supply is connected with a coil of a standby power supply switching relay; the main power supply switching relay and the standby power supply switching relay are connected with each other to form a main power supply output end live wire, and the main power supply output end live wire is connected with the terminal. The utility model discloses a low-cost, reliability are high, improve the power supply reliability who joins in marriage net terminal, because of there being the voltage difference to take place the emergence of fault phenomena such as arc, short circuit between the two live wires when having prevented the activestandby power supply switching load to and reach between the zero live wire, zero live wire is to surge lightning protection to ground.
Description
Technical Field
The utility model relates to a dual power switching device especially relates to a lightning protection type dual power switching device.
Background
Along with the development of Chinese economy, the requirement on the safety and reliability of power utilization of a distribution network is higher and higher, the requirement of the traditional power user primary switch equipment on secondary automation is also increased day by day, and the primary equipment without an automation control function is gradually added with secondary control distribution network terminal equipment. In order to ensure the reliable operation of the distribution network automation terminal equipment, the distribution network automation terminal equipment adopts a double-bus main-standby double-path AC220V power supply mode at present, so that the main power supply is required to be quickly switched to a standby power supply for supplying power when the power failure occurs, a power supply line is often converted into a secondary voltage 220V by a transformer from 10KV, particularly, the lightning stroke condition of an overhead line occurs frequently, the lightning stroke surge influence is often interfered to a secondary side through a primary side or directly interfered to the secondary side, and therefore, the requirement of double-power supply switching is provided for the terminal equipment and the surge lightning protection treatment is required.
The double-power conversion devices in the market at present mostly adopt a single AC220V (coil voltage) relay to switch a double-circuit power supply between two movable contacts, and do not have a lightning protection function. The dual power supply conversion device has certain defects: when the power supply switches, if the load that the relay took is too big, and just when the switching of current crossing peak point, can take place to draw the phenomenon of arc, because of there is the voltage difference (like AC380V) between two powers, can lead to direct short circuit between these two powers to directly burn out the relay contact, burn out the higher authority power transformer of these two powers even, cause and join in marriage net terminal equipment power failure accident, thunderbolt surge can produce destructive influence to above-mentioned circuit arrangement under the bad thunderstorm condition of weather simultaneously.
Disclosure of Invention
The to-be-solved technical problem of the utility model is: how to make terminal equipment can carry out stable two switching of power and avoid direct short circuit between two power and possess lightning protection surge function.
In order to solve the technical problem, the technical scheme of the utility model is to provide a dual power supply switching device, which is characterized in that the device comprises a main power supply and a standby power supply, wherein the main power supply is connected with a coil of an auxiliary control relay and a coil of a main power supply switching relay, and the standby power supply is connected with a coil of a standby power supply switching relay; a normally closed contact of the auxiliary control relay is connected in series into a coil loop of the standby power supply switching relay, and a normally open contact of the auxiliary control relay is connected in series into a coil loop of the main power supply switching relay; the normally open contact of the main power switching relay is connected in series into a power supply loop of the main power, and the normally open contact of the standby power switching relay is connected in series into a power supply loop of the standby power; the main power supply switching relay and the standby power supply switching relay are connected with each other to form a main power supply output end live wire, and the main power supply output end live wire is connected with the terminal.
Preferably, the lightning protection circuit is arranged at the rear ends of the main power supply switching relay and the standby power supply switching relay.
Preferably, the lightning protection circuit comprises a first transient suppression diode, a first piezoresistor and a first capacitor, wherein the first transient suppression diode and the first capacitor are connected in parallel with the first piezoresistor; the two ends of the first transient suppression diode, the first capacitor and the first voltage dependent resistor are respectively connected with a live wire and a zero wire of the total power output end.
Preferably, the lightning protection circuit is arranged at the front ends of the main power supply switching relay, the standby power supply switching relay and the auxiliary control relay.
Preferably, a lightning protection circuit is arranged behind the main power supply and the standby power supply; the lightning protection circuit behind the main power supply comprises a first transient suppression diode, a first voltage dependent resistor and a first capacitor, wherein the first transient suppression diode and the first capacitor are connected with the first voltage dependent resistor in parallel, and two ends of the first transient suppression diode, the first voltage dependent resistor and the first capacitor are respectively connected with a first live wire and a zero line; the lightning protection circuit behind the standby power supply comprises a second transient suppression diode, a second piezoresistor and a second capacitor, the second transient suppression diode and the second capacitor are connected with the second piezoresistor in parallel, and two ends of the second transient suppression diode, the second piezoresistor and the second capacitor are respectively connected with a second live wire and a zero line; the first live wire is the live wire before the main power supply is connected with the coil of the auxiliary control relay and the coil of the main power supply switching relay, and the second live wire is the live wire between the standby power supply and the coil of the standby power supply switching relay.
Preferably, the lightning protection circuit further comprises a gas discharge tube and a third capacitor, the gas discharge tube is connected with the third capacitor in series, one end of the gas discharge tube is connected with one end of the third capacitor, the other end of the gas discharge tube is connected with a zero line, and the other end of the third capacitor is connected with a shell grounding wire; the housing ground is also connected to the housing of the terminal.
Preferably, a differential mode inductor is respectively arranged at the front end of each lightning protection circuit.
Preferably, the main power supply is a power supply of which the power supply line is transformed by a second power supply transformer, and the power supply line is connected with a coil of the auxiliary control relay and a coil of the main power supply switching relay by the second power supply transformer; the standby power supply is a power supply of which the power supply line is transformed by the first power supply transformer, and the power supply line is connected with the coil of the standby power supply switching relay by the first power supply transformer.
Compared with the prior art, the utility model discloses a low cost, reliability are high, improve the reliability of supplying power of joining in marriage net terminal, effectively solve the problem in the background art, and it still has following beneficial effect:
1. the auxiliary control relay utilizes the characteristics that when the relay acts, the normally closed contact is opened firstly and the normally open contact is closed later, and prevents the occurrence of the fault phenomena of arc discharge, short circuit and the like caused by the voltage difference between two live wires when the main power supply switches the load by switching a light load mode of switching a main power supply switching relay and a standby power supply switching relay coil instead of directly switching a large load of the power supply by two movable contacts of the relay.
2. The lightning protection effect of zero-live line (differential mode) and zero-live line to ground (common mode) surge is achieved through the circuit design of elements such as a transient suppression diode, a gas discharge tube, a first piezoresistor and a capacitor.
The utility model is used for on distribution network automation station terminal (be called the terminal for short), be applicable to places such as electricity distribution room, looped netowrk cabinet, switch room, integrated house, join in marriage and become, open and close station (station).
Drawings
Fig. 1 is a system schematic block diagram of a dual power switching device (a lightning protection circuit is arranged at the rear ends of a main power switching relay, a standby power switching relay and an auxiliary control relay);
fig. 2 is a system schematic block diagram of a dual power switching device (a lightning protection circuit is arranged at the front ends of a main power switching relay, a standby power switching relay and an auxiliary control relay).
Detailed Description
In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
Example 1
The utility model provides a dual power supply switching device, as shown in fig. 1, it includes main power source switching relay (including corresponding switch K2), stand-by power supply switching relay (including corresponding switch K3), auxiliary control relay (including corresponding switch K1) and lightning protection circuit.
The main power supply directly controls the auxiliary control relay and the main power supply switching relay; the standby power supply controls a coil 3 of the standby power supply switching relay, and the lightning protection circuit is connected after the switching of the two power supplies is completed (namely the lightning protection circuit is arranged at the rear ends of the main power supply switching relay and the standby power supply switching relay). 1 group of normally closed contacts of the auxiliary control relay are connected in series into a coil 3 loop of the standby power supply switching relay, and 2 groups of normally open contacts of the auxiliary control relay are connected in series into a coil 1 loop of the main power supply switching relay; 1 group of normally open contacts of the main power switching relay are connected in series into a main power supply loop, and 1 group of normally open contacts of the standby power switching relay are connected in series into a standby power supply loop; and the main power supply switching relay and the standby power supply switching relay are connected with the power supply behind the two groups of normally open contacts to form a main power supply output end live wire L. The main power output end live wire L and the zero line N are respectively connected with a lightning protection circuit, and the lightning protection circuit is connected with a terminal. The power supply is switched by the double power supplies and then passes through the lightning protection circuit.
The lightning protection circuit comprises a first transient suppression diode TVS1, a first voltage dependent resistor VDR1 and a first capacitor C1, wherein the first transient suppression diode TVS1, the first capacitor C1 and the first voltage dependent resistor VDR1 are connected in parallel; the first transient suppression diode TVS1, the first capacitor C1 and the first voltage dependent resistor VDR1 are connected to the live line L and the neutral line N of the total power output terminal, respectively. The lightning protection circuit further comprises a gas discharge tube Q1 and a third capacitor C3, the gas discharge tube Q1 is connected with the third capacitor C3 in series, one end of the gas discharge tube Q1 is connected with one end of the third capacitor C3, the other end of the gas discharge tube Q1 is connected with a zero line N, and the other end of the third capacitor C3 is connected with a shell grounding wire FG; the housing ground line FG is also connected to the housing of the terminal.
The lightning protection circuit is divided into a common mode part and a differential mode part, wherein the first transient suppression diode TVS1, the first voltage dependent resistor VDR1 and the first capacitor C1 are differential mode parts, and the gas discharge tube Q1 and the third capacitor C3 are common mode parts.
The main power supply is a power supply of which the power supply line is transformed by a second power supply transformer T2, and the power supply line is connected with a coil 2 of the auxiliary control relay and a coil 1 of the main power supply switching relay by a second power supply transformer T2; the standby power supply is a power supply of which the power supply line is transformed by a first power transformer T1, and the power supply line is connected with a coil 3 of the standby power supply switching relay by a first power transformer T1.
The working process of the utility model is as follows:
as shown in fig. 1, ABC in the power supply is a bus voltage of 10KV, the power supply line is transformed by a second power transformer T2 and then used as a power supply (main power) of the auxiliary control relay and the main power switching relay, and the power supply line is transformed by a first power transformer T1 and then used as a power supply (backup power) of the backup power switching relay;
case 1: when the first live wire L1 is electrified and the second live wire L2 is not electrified, after the coil 2 of the auxiliary control relay is electrified, the normally closed contacts a1 and c1 and the normally closed contacts d1 and f1 are disconnected, the normally open contacts a1 and b1 and the normally open contacts d1 and e1 are closed, the coil 3 of the backup power switching relay is not electrified, the normally closed contacts d3 and f3 keep a normally closed state, the coil 1 of the main power switching relay is electrified, the normally closed contacts a2 and c2 are disconnected, the normally open contacts a2 and b2 are closed, the live wire L of the total power output end is electrified, and power is normally supplied to the terminal of the NZK7230 power distribution station automatically.
Case 2: when the second live wire L2 is electrified and the first live wire L1 is not electrified, the coil 2 of the auxiliary control relay is not electrified, the normally closed contacts a1 and c1 keep a normally closed state, after the coil 3 of the standby power supply switching relay is electrified, the normally closed contacts a3 and c3 and the normally closed contacts d3 and f3 are disconnected, the normally open contacts a3 and b3 and the normally open contacts d3 and e3 are closed, the live wire L at the output end of the main power supply is electrified, and the power is normally supplied to the terminal of the power distribution automation station of the NZK 7230.
Case 3: when an L1 first power is supplied, and an L2 later power is supplied, after a coil 2 of the auxiliary control relay is powered on, normally closed contacts a1 and c1 and normally closed contacts d1 and f1 are disconnected, normally open contacts a1 and b1 and normally open contacts d1 and e1 are closed, a coil 3 of the standby power supply switching relay is not powered on, normally closed contacts d3 and f3 are kept in a normally closed state, a coil 1 of the main power supply switching relay is powered on, normally closed contacts a2 and c2 are disconnected, normally open contacts a2 and b2 are closed, and a total power supply live wire output end L is powered on.
Because the first live wire L1 gets electricity first and the normally closed contacts a1 and c1 are disconnected, even if the second live wire L2 outside comes in, the coil 3 of the backup power switching relay can not get electricity, an interlocking mechanism is formed, and the first live wire L1 is still kept to be electrified.
Case 4: when the call comes first from L2 and then comes from L1,
the coil 2 of the auxiliary control relay is not electrified, the normally closed contacts a1 and c1 are kept in a normally closed state, after the coil 3 of the standby power supply switching relay is electrified, the normally closed contacts a3 and c3 and the normally closed contacts d3 and f3 are disconnected, the normally open contacts a3 and b3 and the normally open contacts d3 and e3 are closed, the live wire L of the total power output end is electrified, and power is normally supplied to the terminal of the NZK7230 power distribution automation station.
Because the second live wire L2 is powered first and the normally closed contacts d3 and f3 are disconnected, even if the external first live wire L1 is powered, the coil 2 of the auxiliary control relay cannot be powered, an interlocking mechanism is formed, and the first live wire L1 is still kept powered.
In this embodiment, the second power transformer T2 transforms the 10KV power supply into a 220V main power supply, and the first power transformer T1 transforms the 10KV power supply into a 220V backup power supply. The main power supply switching relay and the standby power supply switching relay both adopt power type relays with coil voltage of AC220V and contact capacity of AC220V and 16A; the auxiliary control relay selects a small signal relay with coil voltage of AC220V and contact capacity of AC220V and 0.1A; the voltage level of the first transient suppression diode TVS1 is AC 680V; the voltage class of the first piezoresistor VDR1 is AC 470V; the gas discharge tube Q1 is selected to have a voltage level of AC 680V; the first capacitor C1 and the third capacitor C3 are both 102C/AC 6000V.
Example 2
In this embodiment, a differential mode inductor is disposed at the front end of the first transient suppression diode TVS1 of the lightning protection circuit.
The rest is the same as in example 1.
Example 3
In this embodiment, as shown in fig. 2, the lightning protection circuit is disposed at the front ends of the main power switching relay, the standby power switching relay, and the auxiliary control relay, and behind the main power and the standby power.
The lightning protection circuit behind the main power supply comprises a first transient suppression diode TVS1, a first voltage dependent resistor VDR1 and a first capacitor C1, wherein the first transient suppression diode TVS1 and the first capacitor C1 are connected with a first voltage dependent resistor VDR1 in parallel, and two ends of the first transient suppression diode TVS1, the first voltage dependent resistor VDR1 and the first capacitor C1 are respectively connected with a first live wire L1 and a zero wire N; the lightning protection circuit behind the standby power supply comprises a second transient suppression diode TVS2, a second voltage dependent resistor VDR2 and a second capacitor C2, the second transient suppression diode TVS2 and the second capacitor C2 are connected with a second voltage dependent resistor VDR2 in parallel, and two ends of the second transient suppression diode TVS2, the second voltage dependent resistor VDR2 and the second capacitor C2 are respectively connected with a second live wire L2 and a zero wire N; the first live wire L1 is the live wire before the main power supply is shunted by the coil 2 connected with the auxiliary control relay and the coil 1 of the main power supply switching relay, and the second live wire L2 is the live wire between the standby power supply and the coil 3 of the standby power supply switching relay.
The rest is the same as in example 1.
Example 4
In this embodiment, the first differential mode inductor L1' is disposed between the second power transformer T2 and the first transient suppression diode TVS1 of a lightning protection circuit; the second differential mode inductor L2' is respectively disposed between the second power transformer T1 and the second transient suppression diode TVS2 of another lightning protection circuit.
The rest is the same as in example 3.
Claims (8)
1. A double-power switching device is characterized by comprising a main power supply and a standby power supply, wherein the main power supply is connected with a coil (2) of an auxiliary control relay and a coil (1) of a main power supply switching relay, and the standby power supply is connected with a coil (3) of the standby power supply switching relay; a normally closed contact of the auxiliary control relay is connected in series into a coil (3) loop of the standby power supply switching relay, and a normally open contact of the auxiliary control relay is connected in series into a coil (1) loop of the main power supply switching relay; the normally open contact of the main power switching relay is connected in series into a power supply loop of the main power, and the normally open contact of the standby power switching relay is connected in series into a power supply loop of the standby power; the main power supply switching relay and the standby power supply switching relay are connected with each other to form a main power supply output end live wire (L), and the main power supply output end live wire (L) is connected with a terminal.
2. The dual power switching device of claim 1, further comprising a lightning protection circuit, wherein the lightning protection circuit is disposed at a rear end of the main power switching relay and the backup power switching relay.
3. The dual power switching device of claim 2, wherein the lightning protection circuit comprises a first transient suppression diode (TVS1), a first voltage dependent resistor (VDR1), a first capacitor (C1), the first transient suppression diode (TVS1), the first capacitor (C1) and the first voltage dependent resistor (VDR1) are connected in parallel; the first transient suppression diode (TVS1), the first capacitor (C1) and the two ends of the first voltage dependent resistor (VDR1) are respectively connected with the live wire (L) and the zero wire (N) of the total power output end.
4. The dual power switching device of claim 1, further comprising a lightning protection circuit, wherein the lightning protection circuit is disposed at a front end of the main power switching relay, the backup power switching relay and the auxiliary control relay.
5. The dual power supply switching device of claim 4, wherein a lightning protection circuit is arranged behind the main power supply and the standby power supply; the lightning protection circuit behind the main power supply comprises a first transient suppression diode (TVS1), a first voltage dependent resistor (VDR1) and a first capacitor (C1), wherein the first transient suppression diode (TVS1) and the first capacitor (C1) are connected with the first voltage dependent resistor (VDR1) in parallel, and two ends of the first transient suppression diode (TVS1), the first voltage dependent resistor (VDR1) and the first capacitor (C1) are respectively connected with a first live wire (L1) and a zero wire (N); the lightning protection circuit behind the standby power supply comprises a second transient suppression diode (TVS2), a second voltage dependent resistor (VDR2) and a second capacitor (C2), wherein the second transient suppression diode (TVS2) and the second capacitor (C2) are connected with the second voltage dependent resistor (VDR2) in parallel, and two ends of the second transient suppression diode (TVS2), the second voltage dependent resistor (VDR2) and the second capacitor (C2) are respectively connected with a second live wire (L2) and a neutral wire (N); the first live wire (L1) is the live wire before the main power supply is shunted by the coil (2) connected with the auxiliary control relay and the coil (1) of the main power supply switching relay, and the second live wire (L2) is the live wire between the standby power supply and the coil (3) of the standby power supply switching relay.
6. The dual power supply switching device of claim 3 or 5, wherein the lightning protection circuit further comprises a gas discharge tube (Q1) and a third capacitor (C3), the gas discharge tube (Q1) is connected in series with the third capacitor (C3), one end of the gas discharge tube (Q1) is connected with one end of the third capacitor (C3), the other end of the gas discharge tube (Q1) is connected with a neutral wire (N), and the other end of the third capacitor (C3) is connected with a casing ground wire (FG); the housing ground line (FG) is also connected to the housing of the terminal.
7. The dual power switching device as claimed in claim 3 or 5, wherein each of the front ends of the lightning protection circuits is provided with a differential mode inductor.
8. The dual power supply switching device of claim 1, wherein the main power supply is a power supply whose power supply line is transformed by a second power supply transformer (T2), and the power supply line is connected with a coil (2) of the auxiliary control relay and a coil (1) of the main power supply switching relay through the second power supply transformer (T2); the standby power supply is a power supply of which the power supply line is transformed by a first power supply transformer (T1), and the power supply line is connected with a coil (3) of the standby power supply switching relay by the first power supply transformer (T1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022110779.6U CN213817336U (en) | 2020-09-23 | 2020-09-23 | Dual-power switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022110779.6U CN213817336U (en) | 2020-09-23 | 2020-09-23 | Dual-power switching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213817336U true CN213817336U (en) | 2021-07-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022110779.6U Active CN213817336U (en) | 2020-09-23 | 2020-09-23 | Dual-power switching device |
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|---|---|
| CN (1) | CN213817336U (en) |
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2020
- 2020-09-23 CN CN202022110779.6U patent/CN213817336U/en active Active
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