CN201146380Y - Voltage loss and phase loss automatic switching protection device - Google Patents

Abstract

The utility model discloses a voltage loss and phase loss self-switching protection device for low-voltage incoming and outgoing line circuit breakers, comprising a housing, a control module arranged in the housing, the control module having a voltage acquisition and analysis circuit, an optical coupling connection, a single-chip control, protection and high-power relay output circuit, and a light-emitting tube display module connected to the control chip; 5 light-emitting tubes connected to the display module for indicating the working state and position of the device are arranged on the housing, and the control module is connected to a high-power electromagnetic relay; the housing is also provided with the following external interfaces connected to the control module: a B-phase connector, a C-phase connector, a switch auxiliary contact and a split connector. The device can realize the automatic operation of power supply and power off.

Description

A self-switching protection device for voltage loss and phase loss

technical field

The utility model relates to an intelligent control and protection technology, in particular to a pressure loss and phase loss self-switching protection device.

Background technique

At present, the market is used for loss of voltage, and there are few self-switching protection cabinets for phase loss, but its structure is simple. It is mainly composed of transfer switches, intermediate relays and time relays. Either the contact is bad and the switch cannot be turned on or it is in the switching state for a long time. , Oscillate and burn out the closing coil, if it is serious, it will not be able to use electricity normally or cause a major electricity accident.

This device is mainly used in the field of unattended or automation. It solves the instability of automatic switching under the existing situation. When the drop switch is dropped or the phase is missing, it can disconnect the main circuit breaker to protect the transformer and the user's electrical equipment. At the same time, it realizes self-protection in the case of switch failure or overcurrent, reducing further damage to the equipment.

Utility model content

The purpose of this utility model is to provide an integrated and independently designed pressure loss and phase loss self-switching protection device for the deficiencies of the prior art, which can overcome the shortcomings of the above-mentioned pressure loss and phase loss self-switching structure, and make the loss of Pressure, phase loss self-switching protection device is more perfect.

The technical scheme provided by the utility model is as follows: a kind of pressure loss and phase loss self-switching protection device for low-voltage incoming and outgoing circuit breaker switches is constructed, which includes a housing, and a control module is arranged in the housing, and the control module It has voltage acquisition and analysis circuit, optocoupler connection, single-chip microcomputer control, protection and high-power relay output circuit, and a light-emitting tube display module connected with the control chip; there is a connection with the display module on the shell, which is used for indicating devices 5 light-emitting tubes in the working state and position, the control module is connected with a high-power electromagnetic relay; the housing is also provided with the following external interfaces connected to the control module: B-phase connector, C-phase connector, Auxiliary contacts and switch joints.

The utility model has the following advantages: the contact points in the device respectively take the B.C phase voltage, the phase voltage is ~220V, the auxiliary contact of the automatic air switch is normally closed, and the closing and breaking points can be connected in parallel to the corresponding closing and opening buttons of the switch. 1 green and 1 red lights indicate that the switch is in the opening position, the power supply is normal, and the voltage signal is detected; 2 green lights indicate that the switch is in the closing position, the power supply is normal, and the automatic air switch is in the closing position; 2 green and 1 red lights are all On means that the device enters the protection position, the power supply is normal, whether the circuit or equipment is faulty, the peripheral circuit or equipment must be maintained, and the power supply of the device can be disconnected to reconnect. The closing delay time of the device is adjustable (6-10-15S Three types), set by the DIP switch: 1.2 at the same time up or down is 6S, 1 up and 2 down is 10S, 1 down and 2 up is 15S; the power-off delay of this device is 3S, and it is confirmed as no power opening when the time exceeds , The number of coincidence times is three times (can be set in advance), this device can realize the automatic operation of power transmission and power failure.

Description of drawings

Fig. 1 is the circuit schematic diagram of the utility model device;

Fig. 2 is a schematic diagram of the connection between the device and the application embodiment 1 of the power supply equipment;

Fig. 3 is a schematic diagram of the connection between the device and the application embodiment 1 of the power supply equipment;

Detailed ways

Referring to Figure 1, it provides a voltage loss and phase loss self-switching protection device for low-voltage incoming and outgoing circuit breaker switches. The control module consists of a voltage acquisition and analysis circuit, an optocoupler connection, a single-chip microcomputer control, protection and a high-power relay output circuit, and two rectifier circuits that supply power to the above two integrated blocks, and the control chip Connected luminous tube display module; five luminous tubes connected to the display module are provided on the housing to indicate the working state and working position of the device. The control module is connected with two high-power electromagnetic relays CJ1 and CJ2 through the drive circuit. There is also a rectifier circuit that provides working voltage for the above-mentioned circuit in the casing. The rectification circuit is composed of two transformers and a corresponding DC conversion circuit. The casing is also provided with the following external interface connected with the control module and the rectification circuit: B-phase connector, C-phase connector, switch auxiliary contact and branching and closing connectors.

Each contact in the device takes B.C phase voltage respectively, and the phase voltage is ~220V. The auxiliary contact of the automatic air switch is normally closed. On means the switch is in the opening position, the power supply is normal, and the voltage signal is detected;

2 green lights indicate that the switch is in the closed position, the power supply is normal, and the automatic air switch is in the closed position; 2 green and 1 red lights are all on, indicating that the device is in the protection position, the power supply is normal, whether the circuit or equipment is faulty, and the periphery must be maintained Line or equipment, just disconnect the power supply of this device and reclose it. The closing time of this device can be adjusted (6-10-15S three kinds), and can be set through the dial switch: 1.2 is 6S when it is up or down at the same time, and 1 is up and 2 is down. 10S, 1 down and 2 up is 15S; the power-off delay of this device is 3S, if the time is exceeded, it is confirmed as no power opening, and the number of reclosing times is three times (can be preset). This device can realize the automatic operation process of power transmission and power failure as follows :

1) Automatic operation of power transmission

1) High-voltage drop switch power transmission or high-voltage load cabinet, circuit breaker cabinet and low-voltage knife switch are closed or the knife switch is in the closed position, that is, the three-phase A.B.C is charged,

2) The first or second energization of phase A and power transmission at the same time ensure the control voltage of the circuit breaker and the working voltage of the voltage loss coil.

3) The first or second energization and simultaneous power transmission of phase C, device collection and analysis, photoelectric coupling, micro-processing analysis and processing, when there is power at the same time as B, and the same detection and processing, if any phase B and C are detected to be unavailable Power on, the microprocessor waits for no action. After the device confirms that both B and C are charged, the device will send out a closing signal within 6-15 seconds (adjustable), and give a corresponding light indication, and the closing contact will control the voltage of phase A to close the circuit breaker.

4) Phase B is powered on at the end and transmitted at the same time, device acquisition and analysis, photoelectric coupling, micro-processing analysis and processing, when there is power at the same time as C, and the same detection and processing, if any phase of B and C is detected to be without power, micro-processing The device waits for no action. After the device confirms that both B and C are charged, the device will send out a closing signal within 6-15 seconds (adjustable), and correspondingly light up to indicate that the closing contact will control the voltage through phase A to close the circuit breaker.

2) Automatic power failure operation

1) When the A-phase high-voltage drop switch is dropped or the cable and knife switch are not closed normally, resulting in no (0V) or less than 50% of the rated voltage (below 120V) in the A-phase voltage, the voltage-loss release operates and the switch breaks down. Brake, when the device sends out the closing signal, because the switch control circuit adopts the A-phase voltage, the switch does not act, and it will stop after empty reclosing three times.

2) When the B-phase high-voltage drop switch is dropped or the cable and knife switch are not closed normally, resulting in no B-phase voltage (0V) or less than 50% of the rated voltage (below 120V), the device collects B-phase no-voltage signal, The microprocessor analyzes and sends out the opening signal after a delay of 3 seconds (guaranteed lightning strike or instantaneous voltage loss misoperation), and correspondingly lights up to indicate that the opening contact controls the voltage through phase A to open the circuit breaker. If the B-phase voltage returns to normal, the device will automatically send a closing signal within 6-15 seconds (adjustable) and close the circuit breaker through the A-phase control voltage;

3) When the C-phase high-voltage drop switch is dropped or the cable and knife switch are not closed normally, resulting in no C-phase voltage (0V) or less than 50% of the rated voltage (below 120V), the device collects C-phase no-voltage signal, The microprocessor analyzes and sends out the opening signal after a delay of 3 seconds (to ensure lightning strike or instantaneous voltage loss misoperation), and correspondingly illuminates the indicator. The opening contact controls the voltage of phase A to open the circuit breaker. If the voltage of phase C back to normal, device

In 6-15 seconds (adjustable), the closing signal is automatically issued and the circuit breaker is closed through the A-phase control voltage.

FIG. 2 is a schematic diagram of the circuit connection between the device and the application embodiment 1 of the power supply equipment.

Fig. 3 is a schematic diagram of the circuit connection of the device and the application embodiment 1 of the power supply equipment.

Claims (2)

1. A voltage loss and phase loss self-switching protection device for low-voltage incoming and outgoing circuit breaker switches, comprising a housing, characterized in that: a control module is arranged in the housing, and the control module has voltage acquisition, Analysis circuit, optocoupler connection, single-chip control, protection and high-power relay output circuit, LED display drive circuit connected to the control chip; there is a connection with the drive circuit on the shell, which is used to indicate the working status of the device and The control module is connected to a high-power electromagnetic relay through a drive circuit; the housing is also provided with the following external interfaces connected to the control module and the rectifier circuit: B-phase connector, C Phase joints, switch auxiliary contacts and branching and closing joints. 2. The voltage-loss and phase-loss self-switching protection device for low-voltage incoming and outgoing circuit breaker switches according to claim 1, characterized in that, the control module is composed of integrated blocks whose models are AT89C2051 and 74SL14 The electronic device is electrically connected, and the housing is provided with five light-emitting tubes connected to the drive circuit for indicating the work of the device and the working state of the device. The control module is connected with two high-power electromagnetic relays through the drive circuit. A rectifier circuit for supplying power to the above-mentioned circuit is also arranged in the casing.

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