CN204858730U - 10KV power distribution cabinet secondary circuit voltage seamless switching device - Google Patents

Abstract

The utility model relates to a 10KV switch board secondary circuit voltage seamless handover device. Its characteristics are: including first input end (L1), second input (L2) and output, wherein there are the coil of third relay (Z3) and a coil of first relay (Z1) with the negative pole both sides are parallelly connected respectively in that first input end (L1) is anodal, and connect in parallel in second input (L2) anodal and negative pole both sides and have second relay (Z2's) coil, wherein the positive pole of first input end (L1) loops through third relay (Z3's) normally open contact, the normally closed contact of second relay (Z2), the normally open contact of first relay (Z1), first diode (D1) and meets output end positive electrode. Through using the identification, adopt the utility model discloses a device back is the 10KV switch board by two DC power supply and independently supplies power, when main power supply source breaks down, can instantaneously switch to stand -by power supply.

Description

10KV power distribution cabinet secondary circuit voltage seamless switching device

technical field

The utility model relates to a seamless switching device for secondary circuit voltage of a 10KV power distribution cabinet.

Background technique

The 10KV power distribution cabinet is a power distribution equipment based on buried cables. Its main features are small footprint, good insulation performance, and small power failure range in case of failure. In view of such advantages, it is generally used in urban centers, commercial areas and residential areas.

After long-term use, it is found that the 10KV power distribution cabinet often has the following faults: 1. The DC module in the 10KV power distribution cabinet is damaged, and the secondary circuit has no voltage when an accident trip occurs, and the switch cannot be tripped. 2. The 10KV power distribution cabinet that has been in operation for more than 3 years has been put into operation. The capacity of the DC battery pack in the cabinet is too low. When an accident trip occurs, the rated voltage required by the motor cannot be output, and the switch cannot be tripped. It can be seen from this that the damage of the mechanism's DC module and the capacity loss of the DC battery pack are the main reasons affecting the normal opening and closing of the switch. Therefore, if the operational reliability of the secondary circuit cannot be effectively improved, such accidents will still occur.

Utility model content

The purpose of this utility model is to provide a 10KV power distribution cabinet secondary circuit voltage seamless switching device with simple structure and low cost, which can effectively ensure the reliability of the secondary circuit power supply voltage after use.

A 10KV power distribution cabinet secondary circuit voltage seamless switching device, which is special in that it includes a first input terminal, a second input terminal and an output terminal, wherein the first input terminal is connected in parallel with the positive pole and the negative pole. The coil of the three relays and the coil of the first relay, and the coil of the second relay are connected in parallel on both sides of the positive pole and the negative pole of the second input terminal; wherein the positive pole of the first input terminal passes through the normally open contact of the third relay, the second relay The normally closed contact of the first relay, the normally open contact of the first relay, the first diode is connected to the positive pole of the output terminal, and the negative pole of the first input terminal passes through the normally open contact of the third relay and the normally closed contact of the second relay in turn. , the normally open contact of the first relay, and the second diode connected to the negative pole of the output terminal; the positive pole of the second input terminal passes through the normally closed contact of the third relay, the normally closed contact of the first relay, and the The normally open contact, the first diode is connected to the positive pole of the output terminal, and the negative pole of the second input terminal passes through the normally closed contact of the third relay, the normally closed contact of the first relay, the normally open contact of the second relay, The second diode is connected to the negative pole of the output terminal.

A capacitor is connected in parallel between the positive pole and the negative pole of the output terminal.

A resistor and a diode are connected in series beside the coil of the first relay, a resistor and a diode are connected in series beside the coil of the second relay, and a resistor and a diode are also connected in series beside the coil of the third relay.

It has been proved by use that after adopting the device of the utility model, the main and backup DC power supplies independently supply power to the 10KV power distribution cabinet. When the main power supply fails, it can be switched to the backup power supply instantaneously. The main supply and auxiliary equipment ensure the stable output of the secondary circuit power supply voltage, the effect is obvious, the installation is simple, and the hard node signal can also be taken out for dispatching and monitoring. Thereby improving work efficiency, effectively reducing equipment failure rate, and saving equipment maintenance funds.

Description of drawings

Accompanying drawing 1 is the circuit schematic diagram of the utility model.

Detailed ways

As shown in Figure 1, the utility model provides a 10KV power distribution cabinet secondary circuit voltage seamless switching device, including the first input terminal L1, the second input terminal L2 and the output terminal, wherein the positive pole of the first input terminal L1 The coil of the third relay Z3 and the coil of the first relay Z1 are respectively connected in parallel on both sides of the negative pole and the positive pole of the second input terminal L2, and the coil of the second relay Z2 is connected in parallel on both sides of the positive pole and the negative pole of the second input terminal L2; wherein the positive pole of the first input terminal L1 Through the normally open contact of the third relay Z3, the normally closed contact of the second relay Z2, the normally open contact of the first relay Z1, the first diode D1 is connected to the positive pole of the output terminal, and the first input terminal L1 The negative pole passes through the normally open contact of the third relay Z3, the normally closed contact of the second relay Z2, the normally open contact of the first relay Z1, and the second diode D2 to the negative pole of the output terminal; the second input terminal L2 The anode of the relay passes through the normally closed contact of the third relay Z3, the normally closed contact of the first relay Z1, the normally open contact of the second relay Z2, the first diode D1 is connected to the positive pole of the output terminal, and the second input terminal The negative pole of L2 passes through the normally closed contact of the third relay Z3, the normally closed contact of the first relay Z1, the normally open contact of the second relay Z2, and the second diode D2 to connect to the negative pole of the output terminal.

Among them, there is a capacitor C in parallel between the positive pole and the negative pole of the output terminal, which plays the role of voltage stabilization filter, and besides the coil of the first relay Z1, there are resistors and diodes that play the role of protection and shunt in series, and the coil of the second relay Z2 The same resistor and diode are connected in series beside the coil of the third relay Z3, and the same resistor and diode are also connected in series beside the coil of the third relay Z3.

The above relays can use DC 24V4 group node intermediate relays.

Using method and working principle of the present utility model are:

As shown in Figure 1, the first input terminal L1 is connected to the main power supply, and the second input terminal L2 is connected to the backup power supply. First, the main power supply is connected. At this time, the coil of the third relay Z3 and the coil of the first relay Z1 are electrically conducted. All the normally open contacts of the two relays are closed, and the main power supply is directly connected to the output terminal as a DC power output. When the main power supply is disconnected, the coil of the third relay Z3 and the coil of the first relay Z1 are de-energized and cut off, all the normally open contacts of the two relays are disconnected, and all the normally closed contacts are closed. The second relay Z2 of the second relay Z2 is electrically conducted, and correspondingly all its normally open contacts are closed, and the standby power supply replaces the connected output terminal as a DC power output, and at the same time, the connection between the main power supply and the output terminal is disconnected.

Claims (3)

1. A 10KV power distribution cabinet secondary circuit voltage seamless switching device, characterized in that it includes a first input terminal (L1), a second input terminal (L2) and an output terminal, wherein the first input terminal (L1) The coil of the third relay (Z3) and the coil of the first relay (Z1) are respectively connected in parallel on both sides of the positive pole and the negative pole, and the coil of the second relay (Z2) is connected in parallel on both sides of the positive pole and the negative pole of the second input terminal (L2). ; wherein the positive pole of the first input terminal (L1) passes through the normally open contact of the third relay (Z3), the normally closed contact of the second relay (Z2), the normally open contact of the first relay (Z1), and the normally open contact of the first relay (Z1). A diode (D1) is connected to the positive pole of the output terminal, and the negative pole of the first input terminal (L1) passes through the normally open contact of the third relay (Z3), the normally closed contact of the second relay (Z2), the first The normally open contact of the relay (Z1) and the second diode (D2) are connected to the negative pole of the output terminal; the positive pole of the second input terminal (L2) passes through the normally closed contact of the third relay (Z3), the first relay The normally closed contact of (Z1), the normally open contact of the second relay (Z2), and the first diode (D1) are connected to the positive pole of the output terminal, while the negative pole of the second input terminal (L2) passes through the third relay ( The normally closed contact of Z3), the normally closed contact of the first relay (Z1), the normally open contact of the second relay (Z2), and the second diode (D2) are connected to the negative pole of the output terminal. 2. The 10KV power distribution cabinet secondary circuit voltage seamless switching device according to claim 1, wherein a capacitor (C) is connected in parallel between the positive pole and the negative pole of the output terminal. 3. The 10KV power distribution cabinet secondary circuit voltage seamless switching device according to claim 1, wherein a resistor and a diode are connected in series next to the coil of the first relay (Z1), and a resistor and a diode are connected in series next to the coil of the second relay (Z2). A resistor and a diode are connected in series beside the coil of the third relay (Z3), and a resistor and a diode are also connected in series beside the coil of the third relay (Z3).