A secondary bus voltage generation device

Abstract

The utility model provides a kind of secondary bus voltage generation device, including the line input voltage terminal of first incoming line switch, the line input voltage terminal of second incoming line switch, bus output voltage terminal, first line switch connection terminal, first line handcart switch position terminal, second line switch connection terminal, second line handcart switch position terminal, first relay and second relay;The first line handcart switch position terminal is also connected with power supply anode, and the second line handcart switch position terminal is also connected with power supply anode;The normally closed contact of second relay is connected with the first relay of the first relay, and the normally closed contact of first relay is connected with the second relay.Application this technical scheme can solve the problem that voltage parallel device cannot adapt three-way voltage, two switches.The device is designed with built-in secondary circuit, which greatly simplifies the external circuit.

Description

Technical Field

[0001] This utility model relates to the field of power distribution network technology, and in particular to a secondary bus voltage generation device. Background Technology

[0002] This practical innovation is applied to busbarless PT bay power distribution rooms (such as...) Figure 1 (The text lists various substation types and their components, which are not directly related to the main text about substations.) The 901 / 902 switches are incoming line switches, paired with VV-connected PTs; 911 / 912 are feeder bays, and there are existing units of this type in substations. Due to the requirements of digital substation construction, bus voltage needs to be collected. The traditional method to obtain bus voltage is to add bus bay units, but this requires a complete power outage and renovation of the entire substation. Furthermore, some older substations in certain areas have limited space and cannot accommodate another bay. Voltage paralleling devices can achieve mutual power supply between the I and II bus voltages through the positions of the bus branch switches, but this only works with two voltage sources and one switch. For substations without bus PT bays, generating bus voltage through the relationship between two incoming line voltages and the bus voltage involves three voltage sources and two switches, which voltage paralleling devices cannot achieve. Currently, there are no relevant patents or inventions in China that involve three voltage sources and two switches to automatically generate bus voltage. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a secondary bus voltage generating device that solves the problem that voltage parallel devices cannot adapt to three voltages and two switches. The device design adopts a built-in secondary circuit, which greatly simplifies the external circuit.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: a secondary bus voltage generating device, comprising a line input voltage terminal of a first incoming switch, a line input voltage terminal of a second incoming switch, a bus output voltage terminal, a first line switch connection terminal, a first line trolley switch position terminal, a second line switch connection terminal, a second line trolley switch position terminal, a first relay, and a second relay; the DC auxiliary contact of the first relay is connected between the first line trolley switch position terminal and the negative terminal of the power supply, and the DC auxiliary contact of the second relay is connected between the second line trolley switch position terminal and the negative terminal of the power supply; the first line trolley switch position terminal is also connected to the positive terminal of the power supply, and the second line trolley switch position terminal is also connected to the positive terminal of the power supply; the first relay is connected to the normally closed contact of the second relay, and the second relay is connected to the normally closed contact of the first relay.

[0005] In a preferred embodiment, the AC auxiliary contact of the first relay is connected between the line input voltage terminal and the bus output voltage terminal of the first incoming switch.

[0006] In a preferred embodiment, the AC auxiliary contact of the second relay is connected between the line input voltage terminal and the bus output voltage terminal of the second incoming switch.

[0007] In a preferred embodiment, the line input voltage terminal of the first incoming switch, the line input voltage terminal of the second incoming switch, and the bus output voltage terminal are integrated into a voltage loop terminal block (1).

[0008] In a preferred embodiment, the voltage circuit terminal block (1) is disposed at the upper end of the secondary bus voltage generating device.

[0009] In a preferred embodiment, the first line switch connection terminal, the first line handcart switch position terminal, the second line switch connection terminal, and the second line handcart switch position terminal are integrated into a logic circuit DC terminal block (2).

[0010] In a preferred embodiment, the logic circuit DC terminal block (2) is disposed at the lower end of the secondary bus voltage generating device.

[0011] In a preferred embodiment, the device further includes mounting slots; the mounting slots are installed on both the side and the back of the secondary bus voltage generating device.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The secondary bus voltage generation device can automatically generate bus voltage based on the status of the two incoming line switches and the incoming line voltage, solving the problem of insufficient space to install more PT bays in the busless PT distribution room.

[0014] 2. The secondary circuit of the secondary bus voltage generation device is built-in, which simplifies the external circuit and greatly facilitates on-site installation;

[0015] 3. The secondary bus voltage generating device can be directly snapped into the switch cabinet without requiring extra space for installation;

[0016] 4. The secondary bus voltage generation device can prevent reverse power feeding caused by the secondary parallel connection of two incoming line voltages. Attached Figure Description

[0017] Figure 1 This is the electrical wiring diagram for a busless PT distribution room.

[0018] Figure 2 This is a preferred embodiment of the operation logic diagram of the first relay and the second relay of the present utility model;

[0019] Figure 3 This is a schematic diagram of the voltage generation circuit of a preferred embodiment of the present invention;

[0020] Figure 4 This is a front view of a secondary bus voltage generating device according to a preferred embodiment of the present invention;

[0021] Figure 5 This is a top view of a secondary bus voltage generating device according to a preferred embodiment of the present invention;

[0022] Figure 6 This is a bottom view of a secondary bus voltage generating device according to a preferred embodiment of the present invention. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application; as used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise; furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] To obtain bus voltage, the traditional approach is to add bus bay units. The disadvantage is that it requires a complete power outage and renovation of the power distribution room. In addition, some old residential areas have limited space in their substations, and there is no longer enough space to accommodate another bay.

[0027] Voltage paralleling devices can achieve mutual power supply between the I and II bus voltages through the position of the bus branch switch. However, this is designed for two voltage sources and one switch. If a distribution room without a busbar PT bay needs to generate bus voltage based on the relationship between the two incoming voltages and the bus voltage, it involves three voltage sources and two switches, which the voltage paralleling device cannot achieve. Currently, there are no relevant patents or inventions in China that involve three voltage sources and two switches to automatically generate bus voltage.

[0028] To achieve "zero power outage" sensing in large and medium-sized residential communities, substations need to have resilient reconfiguration capabilities, thus requiring digital substation upgrades. Older residential communities often have numerous busbar-less PT (potential transformer) bays. To obtain power from each feeder and calculate line losses, and to meet the needs of some standby automatic transfer switches (ATS) for fault assessment by collecting busbar voltage, and to ensure power supply reliability without requiring a complete substation power outage to install PTs, this invention automatically generates the busbar voltage based on the relationship between the two incoming line voltages and the busbar voltage. Furthermore, the proposed device is easy to install, requiring only the mounting slot 3 on the guide rail, and has no special requirements for the operation of the original switchgear.

[0029] Specifically, this utility model provides a secondary bus voltage generating device, including a line input voltage terminal of a first incoming switch, a line input voltage terminal of a second incoming switch, a bus output voltage terminal, a first line switch connection terminal, a first line trolley switch position terminal, a second line switch connection terminal, a second line trolley switch position terminal, a first relay, and a second relay; the DC auxiliary contact of the first relay is connected between the first line trolley switch position terminal and the negative terminal of the power supply, and the DC auxiliary contact of the second relay is connected between the second line trolley switch position terminal and the negative terminal of the power supply; the first line trolley switch position terminal is also connected to the positive terminal of the power supply, and the second line trolley switch position terminal is also connected to the positive terminal of the power supply; the first relay is connected to the normally closed contact of the second relay, and the second relay is connected to the normally closed contact of the first relay.

[0030] The principle of the relationship between incoming line voltage and bus voltage: When the first incoming line switch is closed, the first incoming line voltage can be used as the bus voltage; when the second incoming line switch is closed, the second incoming line voltage can be used as the bus voltage; when both incoming line switches are closed, either incoming line voltage can be used as the bus voltage.

[0031] Bus voltage generation scheme: Based on the relationship between incoming line voltage and bus voltage, a first relay J1 and a second relay J2 were designed. The first relay J1 operates when the first incoming line voltage is used as the bus voltage, and the second relay J2 operates when the second incoming line voltage is used as the bus voltage. The relay operation logic diagram is as follows: Figure 2 When the first incoming line switch is closed and the handcart is in the closed state, the first relay J1 activates, and the secondary voltage of the busbar switches to the secondary voltage of the first incoming line (e.g., Figure 3When the second incoming line switch and the handcart are in the closed state, the second relay J2 operates, and the secondary voltage of the busbar switches to the secondary voltage of the second incoming line. To avoid parallel operation of the two incoming line voltages, a normally closed contact of the second relay J2 is designed in the operating circuit of the first relay J1, and a normally closed contact of the first relay J1 is designed in the operating circuit of the second relay J2. That is, the first relay J1 and the second relay J2 cannot operate simultaneously: after the first relay J1 operates, the normally closed contact of the first relay J1 opens, causing the operating circuit of the second relay J2 to be disconnected; after the second relay J2 operates, the normally closed contact of the second relay J2 opens, causing the operating circuit of the first relay J1 to be disconnected.

[0032] Structural Design: Considering the device's ability to be directly embedded in the switchgear without affecting it, and the device's own reliability, the following requirements are set for the device: 1. Integrate relays and circuits, simplify external circuits, and implement circuits connecting different components within the device itself. Only auxiliary contacts such as switch positions need to be introduced into the device, greatly improving the convenience of on-site installation. 2. Separate AC and DC power supplies are used, with different terminals for voltage and logic inputs. 3. The device is embedded into the switchgear via a snap-fit ​​rail light mechanism. 4. The device uses a DC power supply to ensure operational reliability.

[0033] Front view of the device as shown Figure 4 As shown: Voltage circuit terminal block 1 is located at the upper end of the secondary bus voltage generating device, and logic circuit DC terminal block 2 is located at the lower end of the secondary bus voltage generating device, with AC and DC circuits separated; for easy installation, mounting slots 3 for guide rail installation are provided on both the left and back sides of the device.

[0034] Combination Figure 2 , 3 5, 6, Voltage circuit terminal block 1 includes: X1:1, X1:2, X1:3, X1:4, X1:5, X1:6, X1:7, X1:8, X1:9 are Ua1, Ub1, Uc1, Ua2, Ub2, Uc2, Ua, Ub, Uc respectively, where Ua1, Ub1, Uc1 are the line input voltages of the first incoming switch, Ua2, Ub2, Uc2 are the line input voltages of the second incoming switch, and Ua, Ub, Uc are the bus output voltages. The logic circuit DC terminal block 2 includes: X2:1, X2:2, X2:3, X2:4, X2:5, X2:6, X2:7, X2:8, X2:9, and X2:10, where X2:1 and X2:10 are the positive and negative terminals of the power supply, respectively, and (X2:2, X2:3), (X2:4, X2:5), (X2:6, X2:7), and (X2:8, X2:9) are the positions of the first line switch, the first line handcart switch, the second line switch, and the second line handcart switch, respectively.

[0035] The secondary bus voltage generating device provided by this utility model can generate secondary bus voltage without modifying the primary electrical equipment in the substation, solving the problem that voltage parallel devices cannot adapt to three voltages and two switches. The device design incorporates a built-in secondary circuit, greatly simplifying the external circuit and facilitating on-site construction. Installation does not require on-site personnel to understand the circuit principles. The device has a streamlined structure and can be directly snapped onto the guide rail without affecting the existing equipment.

Claims

1. A secondary bus voltage generating device, characterized in that, The system includes a line input voltage terminal for a first incoming line switch, a line input voltage terminal for a second incoming line switch, a bus output voltage terminal, a first line switch connection terminal, a first line trolley switch position terminal, a second line switch connection terminal, a second line trolley switch position terminal, a first relay, and a second relay. The DC auxiliary contact of the first relay is connected between the first line trolley switch position terminal and the negative terminal of the power supply, and the DC auxiliary contact of the second relay is connected between the second line trolley switch position terminal and the negative terminal of the power supply. The first line trolley switch position terminal is also connected to the positive terminal of the power supply, and the second line trolley switch position terminal is also connected to the positive terminal of the power supply. The first relay is connected to the normally closed contact of the second relay, and the second relay is connected to the normally closed contact of the first relay.

2. The secondary bus voltage generating device according to claim 1, characterized in that, The AC auxiliary contact of the first relay is connected between the line input voltage terminal and the bus output voltage terminal of the first incoming switch.

3. The secondary bus voltage generating device according to claim 1, characterized in that, The AC auxiliary contact of the second relay is connected between the line input voltage terminal and the bus output voltage terminal of the second incoming switch.

4. A secondary bus voltage generating device according to any one of claims 1-3, characterized in that, The line input voltage terminals of the first incoming line switch, the line input voltage terminals of the second incoming line switch, and the bus output voltage terminals are integrated into a voltage loop terminal block (1).

5. A secondary bus voltage generating device according to claim 4, characterized in that, The voltage circuit terminal block (1) is located at the upper end of the secondary bus voltage generating device.

6. A secondary bus voltage generating device according to any one of claims 1-3, characterized in that, The first line switch connection terminal, the first line handcart switch position terminal, the second line switch connection terminal, and the second line handcart switch position terminal are integrated into a logic circuit DC terminal block (2).

7. A secondary bus voltage generating device according to claim 6, characterized in that, The logic circuit DC terminal block (2) is located at the lower end of the secondary bus voltage generation device.

8. A secondary bus voltage generating device according to claim 1, characterized in that, It also includes mounting slots; the mounting slots are installed on both the side and the back of the secondary bus voltage generating device.

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