CN208001183U - Backup auto-activating device and system - Google Patents

Abstract

The utility model relates to a standby automatic switching device and system. A first undervoltage detection module is arranged between the first phase and the second phase, and a second undervoltage detection module is arranged between the second phase and the third phase. Through the first The undervoltage detection module detects the voltage between the first phase and the second phase, and detects the voltage between the second phase and the third phase through the second undervoltage detection module. When the first undervoltage detection module and/or the second phase 2. When the undervoltage detection module detects an undervoltage situation, that is, when there is an undervoltage between any two phases, it will control the backup and self-switching, so that the other normal line will supply power to the tripped and power-off section, ensuring that other lines will go out when a section of the line fails and loses power. The circuit can operate normally, improving the stability and reliability of the power distribution system.

Description

Self-injection device and system

technical field

The utility model relates to a device and a system for self-injection equipment.

Background technique

In today's low-voltage power supply system, the power supply usually adopts the power supply mode of two incoming lines and one bus connection. As shown in Figure 1, when a failure occurs in a certain section of the low-voltage incoming line power supply system, whether the connection switch can be reliably and quickly put into operation is the guarantee of the power supply. The key to uninterrupted power supply is generally to use the standby automatic switching device to control the switching of the power supply, but the standby automatic switching device is expensive, bulky, and takes up too much space in the power distribution cabinet. more and more applications.

The Chinese patent document with the authorized announcement number CN203135568U discloses a standby automatic switching device. The input logic of the standby automatic switching is: when the bus voltage is as low as 60%, enter the standby automatic switching. The standby automatic switching device adopts the method of directly judging the bus voltage to carry out the standby automatic switching control, and does not provide the relevant detection equipment and its detection method. Moreover, the standby automatic switching is only performed according to the voltage range that the bus voltage satisfies, without combining the three-phase The voltage relationship between the AC voltages is judged by the bus voltage, which cannot reflect the voltage relationship between the three-phase AC voltages, and the reliability is not high.

Utility model content

The purpose of the utility model is to provide a backup automatic switching device, which is used to solve the problem that the backup automatic switching is performed only according to the voltage range satisfied by the bus voltage, and the reliability is not high. The utility model also provides a standby self-injection system.

In order to achieve the above purpose, the utility model includes the following technical solutions.

A standby automatic switching device, the three-phase electricity is divided into the first phase, the second phase and the third phase, the standby automatic switching device includes an undervoltage detection part and a standby automatic switching control module for controlling the switching on of the standby automatic switch, said The undervoltage detection part at least includes a first undervoltage detection module arranged between the first phase and the second phase and a second undervoltage detection module arranged between the second phase and the third phase, the The output of the first undervoltage detection module and the second undervoltage detection module are connected to the backup self-switching control module. When the first undervoltage detection module detects undervoltage and/or the second undervoltage detection module detects undervoltage, the backup The automatic switching control module controls the automatic switching of the equipment.

The voltage between the first phase and the second phase is detected by the first undervoltage detection module, and the voltage between the second phase and the third phase is detected by the second undervoltage detection module. When the first undervoltage detection module and /or when the second undervoltage detection module detects an undervoltage situation, it can be understood that when there is an undervoltage between any two phases, it will control the backup and self-switching, so that another normal line will supply power to the tripping and power-off section to ensure that a section of the line is faulty When the power is off, other outlet circuits can operate normally, improving the stability and reliability of the power distribution system.

Further, the first undervoltage detection module is the control coil of the first voltage relay, the second undervoltage detection module is the control coil of the second voltage relay, the contacts of the first voltage relay and the second voltage The contact output of the relay is connected to the standby automatic switching control module. Using the action principle of the voltage relay to detect the voltage state can realize the voltage detection simply and effectively.

Further, the standby self-switching control module includes two control branches, the first control branch is the power supply branch of the intermediate relay, and the connection formed by the contact of the first voltage relay and the contact of the second voltage relay The line and the control coil of the intermediate relay are arranged in series on the first control branch, and the second control branch is the control branch of the standby automatic switch, the control coil of the standby automatic switch and the control coil of the intermediate relay A contact string is provided on the second control branch.

Further, the contacts of the first voltage relay and the contacts of the second voltage relay are arranged in series to form the connecting line, and the contacts of the first voltage relay and the contacts of the second voltage relay are normally open contacts , the contacts of the intermediate relay are normally closed contacts.

Further, the contacts of the intermediate relay are arranged in parallel with a closing button. Manual backup and automatic switching control can be realized through the closing button.

A standby automatic switching system, including a first bus, a second bus, a standby automatic switching device and a standby automatic switching switch between the first bus and the second bus, and the three-phase power is divided into the first phase, the second phase and the second phase Three-phase, the standby automatic switching device includes an undervoltage detection part and a standby automatic switching control module for controlling the standby automatic switching on and off, and the undervoltage detection part at least includes a device for setting between the first phase and the second phase The first undervoltage detection module and the second undervoltage detection module are arranged between the second phase and the third phase, and the outputs of the first undervoltage detection module and the second undervoltage detection module are connected to the backup A switching control module, the standby automatic switching control module controls and connects the standby automatic switching switch, when the first undervoltage detection module detects undervoltage and/or the second undervoltage detection module detects undervoltage, the standby automatic switching control The module control equipment is switched on automatically.

Further, the first undervoltage detection module is the control coil of the first voltage relay, the second undervoltage detection module is the control coil of the second voltage relay, the contacts of the first voltage relay and the second voltage The contact output of the relay is connected to the standby automatic switching control module.

Further, the standby self-switching control module includes two control branches, the first control branch is the power supply branch of the intermediate relay, and the connection formed by the contact of the first voltage relay and the contact of the second voltage relay The line and the control coil of the intermediate relay are arranged in series on the first control branch, and the second control branch is the control branch of the standby automatic switch, the control coil of the standby automatic switch and the control coil of the intermediate relay A contact string is provided on the second control branch.

Further, the contacts of the first voltage relay and the contacts of the second voltage relay are arranged in series to form the connecting line, and the contacts of the first voltage relay and the contacts of the second voltage relay are normally open contacts , the contacts of the intermediate relay are normally closed contacts.

Further, the contacts of the intermediate relay are arranged in parallel with a closing button.

Description of drawings

Figure 1 is a diagram of the power supply system with two incoming lines and one bus tie;

Figure 2 is a schematic diagram of the layout of the voltage relay;

Figure 3 is a schematic diagram of the secondary control of the standby automatic switch.

Detailed ways

Embodiment of the self-injection system

This embodiment provides a backup automatic switching system, including a first bus, a second bus, and a backup automatic switching switch between the first bus and the second bus. As a specific embodiment, as shown in Figure 1, the first One bus corresponds to the incoming line cabinet L01, the second bus corresponds to the incoming line cabinet L10, the backup self-transfer switch is set in the connection cabinet L05, and QF is the corresponding circuit breaker in each cabinet. This part belongs to conventional technology, and will not be described in detail here.

The system also includes a standby automatic switching device, which is used for standby automatic switching control. The standby automatic switching device includes two undervoltage detection modules, the first undervoltage detection module is arranged between phase A and phase B, and the second undervoltage detection module is arranged between phase B and phase C. Since the voltages of the three phases A, B, and C are only different in phase, based on the principle of equivalent replacement, the three phases are divided into the first phase, the second phase, and the third phase. Then, the first undervoltage detection module does not Limited to be set between phase A and phase B, the second undervoltage detection module is not limited to be set between phase B and phase C, but the first undervoltage detection module is essentially set between the first phase and the second phase Between, the second undervoltage detection module is arranged between the second phase and the third phase. The first phase, the second phase, and the third phase respectively correspond to one of the three phases A, B, and C, and the specific corresponding relationship is not unique.

The standby automatic switching device also includes a standby automatic switching control module, the outputs of the first undervoltage detection module and the second undervoltage detection module are connected to the standby automatic switching control module, and the standby automatic switching control module is connected to the standby automatic switching switch, according to the first The voltage state detection signal of the undervoltage detection module and the second undervoltage detection module realizes the standby self-switching control, when the voltage state between phase A and phase B is undervoltage state and/or the voltage state between phase B and phase C In the undervoltage state, that is, when the first undervoltage detection module detects an undervoltage signal and/or the second undervoltage detection module detects an undervoltage signal, the standby automatic switching control module controls the standby automatic switching switch action to realize the standby automatic switching . In addition, the standby automatic switching switch can be a device that exists in the line itself, or it can be a component of the standby automatic switching device.

In this embodiment, the voltage relay is used to detect the undervoltage signal. Further, the voltage relay is an undervoltage relay, that is, both the first undervoltage detection module and the second undervoltage detection module are undervoltage relays. Then, the first undervoltage detection module is the control coil of the first voltage relay, and the second undervoltage detection module is the control coil of the second voltage relay. As shown in Figure 2, the first voltage relay is a voltage relay 11YJ, and the second voltage relay is The relay is a voltage relay 12YJ. And the contact output of the voltage relay 11YJ and the contact output of the voltage relay 12YJ are connected to the automatic switching control module. Undervoltage detection is realized based on the working principle of the voltage relay.

The standby automatic switching control module can be a control chip, which realizes standby automatic switching control according to a software control program, or can be a specific control circuit, which realizes standby automatic switching control through hardware circuit connections. In this embodiment, the standby automatic switch control module is a hardware circuit. The standby automatic switching control module includes two control branches. The first control branch is the power supply branch of the intermediate relay 1ZJ. In this embodiment, the power supply connected to the power supply branch is A phase and C phase, as shown in Figure 2 As shown, the control coil of the intermediate relay 1ZJ, the contact of the voltage relay 11YJ and the contact of the voltage relay 12YJ are arranged in series on the power supply branch; the second control branch is the control branch of the standby automatic switching switch, as shown in Figure 3 , the control coil of the relay X is exactly the control coil of the backup self-injection switch, the contact corresponding to the relay X is the backup self-injection switch, and the control coil of the relay X and the contacts of the intermediate relay 1ZJ are arranged in series on the second control branch. Wherein, the contacts of the voltage relay 11YJ and the voltage relay 12YJ on the first control branch are both normally open contacts, and the contacts of the intermediate relay 1ZJ on the second control branch are normally closed contacts. Moreover, on the second control branch, the contacts of the intermediate relay 1ZJ are arranged in parallel with the closing button HA of the contact cabinet, and the closing button HA of the contact cabinet can realize manual backup and automatic switching control.

In this embodiment, during normal operation, the incoming line cabinet L01 provides electric energy, and the incoming line cabinet L10 is used as a backup. When the voltage at the incoming line terminal of the incoming line cabinet L01 is abnormal, the incoming line cabinet L10 is input. The two voltage relays in the standby automatic switching device are connected to the incoming line end of the incoming line cabinet L01. Correspondingly, if the incoming line cabinet L10 provides electric energy during normal operation, and the incoming line cabinet L01 is used as a backup. The two voltage relays need to be connected to the L10 incoming line terminal of the incoming line cabinet. In order to realize the distinction of device names, the name of the intermediate relay in the circuit must be changed to 2ZJ. If both the incoming line cabinet L01 and the incoming line cabinet L10 are equipped with a backup self-injection device, then the incoming line end of the incoming line cabinet L01 and the incoming line end of the incoming line cabinet L10 are both equipped with the circuit structure shown in Figure 2, and the incoming line cabinet L10 The two voltage relays corresponding to the incoming line end are named according to the actual situation, and the intermediate relay connected to the incoming line end of L10 of the incoming line cabinet is 2ZJ.

In order to reduce the complexity of the circuit, the two standby automatic switching devices can use the same control branch of the standby automatic switching switch, as shown in Figure 3, the contacts of the intermediate relay 1ZJ and the contacts of the intermediate relay 2ZJ are set in parallel.

The following uses the incoming line terminal of the incoming line cabinet L01 as an example for description.

There is an electrical interlock 3 in 2 between two incoming line cabinets and one contact cabinet. When the voltage at the incoming terminal of the L01 circuit breaker of the incoming line cabinet is normal, the control coils of the voltage relays 11YJ and 12YJ are normally energized, and their normally open contacts are closed. At this time, the control coil of the intermediate relay 1ZJ is energized, and its normally closed contacts are broken. Open, at this time the control coil of relay X is de-energized, that is, the closing coil of the contact cabinet is de-energized, the closing circuit of the contact cabinet is in a locked state, and cannot be operated. When undervoltage occurs at the incoming line end of the circuit breaker L01 of the incoming cabinet, the control coil of the voltage relay 11YJ and/or the control coil of the voltage relay 12YJ loses power, the circuit breaker trips, and the normally open contacts of the voltage relay 11YJ and/or 12YJ Restore disconnection, at this time the control coil of the intermediate relay 1ZJ loses power, and its normally closed contact returns to close, at this time the control coil of the relay X is energized, the closing coil of the contact cabinet is energized, and the closing circuit of the contact cabinet is released, and the Power is closed, that is, the standby automatic switch is closed, the contact cabinet is put into operation, and the standby automatic switch is realized, and the closing circuit will be charged until the voltage of the incoming line on the fault side recovers. At this time, the incoming line on the normal side supplies power to the two sections. In addition, after the voltage is restored, it is necessary to open the contact cabinet first, and then re-close, trip and trip the incoming cabinet to realize two independent power supplies again.

In the above embodiment, the contacts of the voltage relay 11YJ on the first control branch and the contacts of the voltage relay 12YJ are normally open contacts, and the contacts of the intermediate relay 1ZJ on the second control branch are normally closed contacts. It is only a specific implementation mode. As other embodiments, the contacts of the voltage relay 11YJ on the first control branch and the contacts of the voltage relay 12YJ can also be normally closed contacts. Then, the contacts of the voltage relay 12YJ on the first control branch The contact of the voltage relay 11YJ and the contact of the voltage relay 12YJ need to be arranged in parallel, and the contact of the intermediate relay 1ZJ on the second control branch will be a normally open contact. The working process of this circuit structure is: when the voltage at the incoming line terminal of the L01 circuit breaker of the incoming line cabinet is normal, the control coils of the voltage relays 11YJ and 12YJ are normally energized, and their normally closed contacts are disconnected. At this time, the control coils of the intermediate relay 1ZJ When power is lost, its normally open contact is disconnected, the closing coil of the contact cabinet is de-energized, and the standby automatic switching is not performed. When undervoltage occurs at the incoming terminal of the circuit breaker L01 of the incoming cabinet, the control coil of the voltage relay 11YJ and/or the control coil of the voltage relay 12YJ loses power, the circuit breaker trips, and the normally closed contacts of the voltage relay 11YJ and/or 12YJ The point is restored to close, at this time the control coil of the intermediate relay 1ZJ is energized, its normally open contact is closed, at this time the control coil of the relay X is energized, and the closing coil of the contact cabinet is energized to realize the standby automatic switching.

In addition, on the basis of the above technical solution, another voltage relay can be set between phase A and phase C to realize the undervoltage detection between phase A and phase C, and then, the contacts of the voltage relay can be set in series On the first control branch, the principle and process of the standby automatic switching control are the same as those of the above-mentioned technical solution, and will not be described in detail here.

Specific implementations have been given above, but the utility model is not limited to the described implementations. The basic train of thought of the present utility model lies in the basic structure of the above-mentioned standby self-injection device. Changes, modifications, replacements and modifications to the embodiments without departing from the principle and spirit of the present utility model still fall within the protection scope of the present utility model.

Embodiment of self-injection device

This embodiment provides a standby automatic switching device, including a first undervoltage detection module arranged between the first phase and the second phase, and a second undervoltage detection module arranged between the second phase and the third phase. The output of the first undervoltage detection module and the second undervoltage detection module is connected to the backup automatic switch control module. When the first undervoltage detection module detects the undervoltage And/or when the second undervoltage detection module detects undervoltage, the standby automatic switching control module controls the standby automatic switching. Since the standby automatic switching device has been described in detail in the above-mentioned system embodiments, it will not be described in detail here.

Claims (10)

1. A standby automatic switching device, three-phase electricity is divided into the first phase, the second phase and the third phase, it is characterized in that, the standby automatic switching device includes an undervoltage detection part and a switch for controlling the standby automatic switching The undervoltage detection part at least includes a first undervoltage detection module arranged between the first phase and the second phase and a first undervoltage detection module arranged between the second phase and the third phase Two undervoltage detection modules, the output of the first undervoltage detection module and the second undervoltage detection module are connected to the standby automatic switching control module, when the first undervoltage detection module detects undervoltage and/or the second undervoltage detection When the module detects undervoltage, the standby automatic switching control module controls the standby automatic switching. 2. The self-switching device according to claim 1, characterized in that, the first undervoltage detection module is the control coil of the first voltage relay, and the second undervoltage detection module is the control coil of the second voltage relay The coil, the contact output of the first voltage relay and the contact output of the second voltage relay are connected to the standby self-switching control module. 3. The standby automatic switching device according to claim 2, wherein the standby automatic switching control module includes two control branches, the first control branch is a power supply branch of an intermediate relay, and the first voltage The connection line formed by the contacts of the relay and the contacts of the second voltage relay and the control coil of the intermediate relay are arranged in series on the first control branch, and the second control branch is the control branch of the automatic switching switch. The control coil of the standby automatic switching switch and the contacts of the intermediate relay are arranged in series on the second control branch. 4. The standby self-switching device according to claim 3, characterized in that, the contacts of the first voltage relay and the contacts of the second voltage relay are arranged in series to form the connecting line, and the contacts of the first voltage relay The contacts and the contacts of the second voltage relay are normally open contacts, and the contacts of the intermediate relay are normally closed contacts. 5. The standby automatic switching device according to claim 3 or 4, characterized in that the contacts of the intermediate relay are arranged in parallel with a closing button. 6. A standby automatic switching system, including the first bus, the second bus, the standby automatic switching device and the standby automatic switching switch between the first bus and the second bus, and the three-phase power is divided into the first phase and the second phase and the third phase, it is characterized in that the standby automatic switching device includes an undervoltage detection part and a standby automatic switching control module for controlling the automatic switchover of the standby switch, and the undervoltage detection part at least includes a and the first undervoltage detection module between the second phase and the second undervoltage detection module arranged between the second phase and the third phase, the first undervoltage detection module and the second undervoltage detection module The output is connected to the backup self-switching control module, and the backup self-switching control module is connected to the backup self-switching switch. When the first undervoltage detection module detects undervoltage and/or the second undervoltage detection module detects undervoltage , the standby automatic switch control module controls the standby automatic switch. 7. The standby automatic switching system according to claim 6, characterized in that, the first undervoltage detection module is the control coil of the first voltage relay, and the second undervoltage detection module is the control coil of the second voltage relay The coil, the contact output of the first voltage relay and the contact output of the second voltage relay are connected to the standby self-switching control module. 8. The standby automatic switching system according to claim 7, wherein the standby automatic switching control module includes two control branches, the first control branch is a power supply branch of an intermediate relay, and the first voltage The connection line formed by the contacts of the relay and the contacts of the second voltage relay and the control coil of the intermediate relay are arranged in series on the first control branch, and the second control branch is the control branch of the automatic switching switch. The control coil of the standby automatic switching switch and the contacts of the intermediate relay are arranged in series on the second control branch. 9. The standby automatic switching system according to claim 8, characterized in that, the contacts of the first voltage relay and the contacts of the second voltage relay are arranged in series to form the connection line, and the contacts of the first voltage relay The contacts and the contacts of the second voltage relay are normally open contacts, and the contacts of the intermediate relay are normally closed contacts. 10. The standby automatic switching system according to claim 8 or 9, characterized in that the contacts of the intermediate relay are arranged in parallel with a closing button.