Power supply switching control device

Abstract

The utility model relates to a power supply switching control device, which comprises an input unit, a timing unit, a processing unit and an output unit, the input unit receives a change signal of an auxiliary contact of the circuit breaker and outputs the change signal to the processing unit; the processing unit outputs a received change signal of an auxiliary contact of the circuit breaker to the timing unit, and outputs a working power supply circuit breaker opening command signal to the timing unit; the timing unit receives the change signal of the auxiliary contact of the circuit breaker and the opening command signal of the working power supply circuit breaker, which are sent by the processing unit, and outputs the time difference of the two signals to the processing unit; the processing unit compares the time difference with a set value and sends an execution signal to the output unit; the output unit outputs an execution signal to the working power supply circuit breaker, the working power supply circuit breaker is switched off, then the execution signal is output to the standby power supply circuit breaker, and the standby power supply circuit breaker executes switching on or stops power supply switching action according to the execution signal.

Description

TECHNICAL FIELD

[0001] The utility model relates to power supply system field especially relates to a power switching control device. BACKGROUND

[0002] In the power supply system with standby power supply, the standby power supply should be automatically put into when the working power supply is faulted or is disconnected by mistake. When the working power supply is faulted, since the main switch of the circuit breaker is not disconnected, the auxiliary contact of the circuit breaker is also in the closed state. The power switching control device detects the working power supply fault, issues the tripping command of the working power supply circuit breaker, and then detects from the input unit that the auxiliary contact of the circuit breaker is switched from the closed state to the separated state, that is, the auxiliary contact of the circuit breaker is separated after the tripping command of the working power supply circuit breaker is issued, and the power switching control device continues the switching operation, issues the closing command of the standby power supply circuit breaker, and the standby power supply is automatically put into.

[0003] When the working power supply is disconnected by mistake, it is usually that the tripping button of the circuit breaker is mistakenly pressed by a person, and since the main switch of the circuit breaker is already disconnected, the auxiliary contact of the circuit breaker is switched from the closed state to the separated state. The power switching control device detects the working power supply fault, issues the tripping command of the working power supply circuit breaker. That is, when the tripping command is issued, the auxiliary contact of the circuit breaker has already been separated. If the auxiliary contact of the circuit breaker is separated before the tripping command, the existing power switching control device will consider it as a system fault, and the power switching action is stopped, so that the standby power supply cannot be automatically put into, resulting in power interruption and equipment shutdown. SUMMARY

[0004] The utility model provides a kind of power switching control device, to avoid being identified as system fault when working power supply is disconnected by mistake to provide hardware basis, avoid power interruption.

[0005] To solve the above technical problems, the utility model provides a kind of power switching control device, it is characterized in that, including input unit, timing unit, processing unit, output unit;

[0006] The input unit receives the change signal of the auxiliary contact of the circuit breaker and outputs the change signal to the processing unit;The processing unit outputs the change signal of the auxiliary contact of the circuit breaker to the timing unit, and outputs the tripping command signal of the working power supply circuit breaker to the timing unit;

[0007] The timing unit receives the change signal of the auxiliary contact of the circuit breaker and the tripping command signal of the working power supply circuit breaker issued by the processing unit, and outputs the time difference of the two signals to the processing unit;

[0008] The processing unit compares the size of time difference and set value, and issues execution signal to output unit;

[0009] The output unit outputs an execution signal to the working power circuit breaker, trips the working power circuit breaker, and then outputs an execution signal to the standby power circuit breaker, which executes closing or stops the power switching action according to the execution signal.

[0010] In some embodiments, the processing unit compares the time difference between the two signals with a set value, and sends a closing execution signal to the output unit, which outputs the closing execution signal to the standby power circuit breaker, which executes closing.

[0011] In some embodiments, the processing unit compares the time difference between the two signals with a set value, and sends a closing execution signal to the output unit, which outputs the closing execution signal to the standby power circuit breaker, which executes closing.

[0012] In some embodiments, the change signal of the circuit breaker auxiliary contact refers to the signal of the circuit breaker auxiliary contact changing from a closed state to an open state.

[0013] In some embodiments, the timing unit is built into the processing unit.

[0014] In some embodiments, the time from the change of the circuit breaker auxiliary contact to the sending of the working power circuit breaker tripping command is M ms, 0 < M < 10, and the set value is N ms, N > M. In some embodiments, N = 10.

[0015] The utility model also provides a power switching control device, including input unit, timing unit, processing unit, output unit,

[0016] The input unit receives the change signal of the circuit breaker auxiliary contact and outputs the change signal to the processing unit. The processing unit outputs the change signal of the circuit breaker auxiliary contact to the timing unit and outputs the working power failure signal to the timing unit.

[0017] The timing unit receives the change signal of the circuit breaker auxiliary contact and the working power failure signal sent by the processing unit, and outputs the time difference between the two signals to the processing unit.

[0018] The processing unit compares the time difference with the set value and sends an execution signal to the output unit.

[0019] The output unit outputs an execution signal to the working power circuit breaker, trips the working power circuit breaker, and then outputs an execution signal to the standby power circuit breaker, which executes closing or stops the power switching action according to the execution signal.

[0020] Compared with the prior art, the utility model has the beneficial effects that by introducing the timing unit, the timing unit receives the change signal of the auxiliary contact of the circuit breaker and the tripping command signal of the working power supply circuit breaker sent by the processing unit, and outputs the time difference of the two signals to the processing unit, the processing unit compares the time difference with the size of the set value, and sends the closing or the execution signal of the power supply switching. When the time difference is less than the set value, the closing execution signal is still output, and the power supply is continued to be switched, so that the working power supply is avoided from being mistaken as a system failure to stop the power supply switching when the working power supply is mistakenly disconnected, and power supply interruption is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structural block diagram of the power supply switching control device of the utility model. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model; obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments, and all other embodiments obtained by those skilled in the art without creative labor based on the embodiments in the utility model belong to the protection scope of the utility model.

[0023] In the description of the utility model, it should be explained that the terms "upper", "lower", "inner", "outer", "top / bottom end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0024] In the description of the utility model, it should be explained that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "sleeved / connected", "connected" and the like should be understood broadly, for example, "connected" can be wall-mounted connection, can be detachable connection, or integral connection, can be mechanical connection, can be electrical connection, can be direct connection, can be indirect connection through an intermediate medium, can be the communication inside two elements, and those skilled in the art can understand the specific meaning of the above terms in the utility model according to the specific circumstances.

[0025] Embodiment 1

[0026] Reference Figure 1The embodiment provides a power switching control device, which comprises an input unit, a timing unit, a processing unit and an output unit; the timing unit can be built in the processing unit and become a component in the processing unit, such as a timer in the processing unit;

[0027] The input unit receives a signal of the change of the auxiliary contact of the circuit breaker from a closed state to an open state and outputs the signal to the processing unit; the processing unit receives the signal of the change of the auxiliary contact of the circuit breaker from the closed state to the open state and outputs the signal to the timing unit, and outputs a working power circuit breaker tripping command signal to the timing unit;

[0028] The timing unit receives the signal of the change of the auxiliary contact of the circuit breaker from the closed state to the open state and the working power circuit breaker tripping command signal output by the processing unit, and outputs the time difference between the two signals to the processing unit;

[0029] The processing unit compares the time difference between the two signals with a set value, and outputs an execution signal to the output unit; the output unit outputs the execution signal to the working power circuit breaker, trips the working power circuit breaker, and then outputs the execution signal to the standby power circuit breaker, and the standby power circuit breaker executes closing or suspends the power switching action according to the execution signal. When the working power is incorrectly disconnected to the power switching control device, the time for issuing the working power circuit breaker tripping command is generally short, and is normally M ms, 0

[0030] Specifically, when the processing unit compares the time difference between the two signals with the set value, an execution signal of closing is output to the output unit, the output unit outputs the execution signal of closing to the standby power circuit breaker, and the standby power circuit breaker executes closing.

[0031] When the processing unit compares the time difference between the two signals with the set value, an execution signal of closing is output to the output unit, the output unit outputs the execution signal of closing to the standby power circuit breaker, and the standby power circuit breaker executes closing.

[0032] The specific working method of the power switching control device of the embodiment is as follows:

[0033] When the working power is incorrectly disconnected, the main switch of the circuit breaker has been disconnected, the auxiliary contact of the circuit breaker changes from the closed state to the open state, the input unit receives the signal of the change of the auxiliary contact of the circuit breaker from the closed state to the open state, the input unit sends the signal to the processing unit, and then to the timing unit, at this time, the timing unit starts timing.

[0034] Then, the power switching control device detects a working power supply fault and issues a working power supply circuit breaker tripping command. At the same time, the processing unit sends the tripping command to the timing unit. Upon receiving the tripping command, the timing unit stops timing and returns the calculated time difference to the processing unit, which then compares it with the set value.

[0035] If the time difference is less than the set value, the switching operation continues, the processing unit outputs the closing execution signal, and the output unit outputs it to the backup power circuit breaker to perform the closing action, and the backup power supply is put into use.

[0036] If the time difference is greater than the set value, it is determined to be a system fault, and the processing unit outputs an execution signal to stop the power switching, thus stopping the power switching action.

[0037] When the working power supply fails, the main circuit breaker switch remains open, and the auxiliary contacts of the circuit breaker are also closed. The input unit detects that the auxiliary contacts are also closed, so the timing unit will not respond. The power switching control device detects the working power supply failure and issues a command to open the working power supply circuit breaker. Then, it detects from the input unit that the auxiliary contacts have changed from closed to open, meaning the auxiliary contacts only open after the working power supply circuit breaker command is issued. At this point, the switching operation continues, and a command to close the backup power supply circuit breaker is issued, automatically switching on the backup power supply.

[0038] Example 2

[0039] The difference between this embodiment and Embodiment 1 is that the power switching control device can add a delay between detecting a working power supply fault and issuing a working power supply circuit breaker tripping command. In this case, the timing unit's timing is changed accordingly to receive the signal from the processing unit indicating that the circuit breaker auxiliary contact has changed from a closed state to an open state, and the working power supply fault signal. The time difference between the two signals is then output to the processing unit. The rest is the same as in Embodiment 1 and will not be repeated here.

[0040] The above description is only a preferred embodiment of the present utility model, but the design concept of the present utility model is not limited thereto. Any non-substantial modifications made to the present utility model by those skilled in the art within the scope of the technology disclosed in the present utility model using this concept shall be deemed as an infringement of the protection scope of the present utility model.

Claims

1. A power switching control device, characterized by comprising: The input unit receives the change signal of the auxiliary contact of the circuit breaker and outputs the change signal to the processing unit; the processing unit outputs the change signal of the auxiliary contact of the circuit breaker to the timing unit and outputs the working power circuit breaker tripping command signal to the timing unit; The timing unit receives the change signal of the auxiliary contact of the circuit breaker and the working power circuit breaker tripping command signal output by the processing unit and outputs the time difference of the two signals to the processing unit; The processing unit compares the time difference with the set value and outputs the execution signal to the output unit; The output unit outputs the execution signal to the working power circuit breaker, trips the working power circuit breaker, and then outputs the execution signal to the standby power circuit breaker, which executes the closing or stops the power switching action according to the execution signal. The input unit receives the change signal of the auxiliary contact of the circuit breaker and outputs the change signal to the processing unit; the processing unit outputs the change signal of the auxiliary contact of the circuit breaker to the timing unit and outputs the working power failure signal to the timing unit; 2. A power switching control device, characterized by comprising: The timing unit receives the change signal of the auxiliary contact of the circuit breaker and the working power failure signal output by the processing unit and outputs the time difference of the two signals to the processing unit; The processing unit compares the time difference with the set value and outputs the execution signal to the output unit; The output unit outputs the execution signal to the working power circuit breaker, trips the working power circuit breaker, and then outputs the execution signal to the standby power circuit breaker, which executes the closing or stops the power switching action according to the execution signal. The processing unit compares the time difference of the two signals with the set value, outputs the closing execution signal to the output unit, and the output unit outputs the closing execution signal to the standby power circuit breaker, which executes the closing. The processing unit compares the time difference of the two signals with the set value, outputs the closing execution signal to the output unit, and the output unit outputs the closing execution signal to the standby power circuit breaker, which executes the closing.

3. The power switching control device according to claim 1 or 2, characterized by The change signal of the auxiliary contact of the circuit breaker refers to the signal that the auxiliary contact of the circuit breaker changes from the closed state to the separated state.

4. The power switching control device according to claim 1 or 2, characterized by The timing unit is built in the processing unit.

5. The power switching control device according to claim 1 or 2, characterized by The time from the change of the auxiliary contact of the circuit breaker to the issuance of the working power circuit breaker tripping command is M ms, 0 < M < 10, and the set value is N ms, N > M.

6. The power switching control device according to claim 1 or 2, characterized by N = 10.

7. The power switching control device according to claim 1 or 2, characterized by ​ 8. The power switching control device of claim 7, wherein ​

Images