A remote control locking device for backup power supply automatic throw-in

Abstract

The utility model relates to a kind of remote control locking device of backup power supply, including device shell and the remote control input circuit, remote control output circuit and locking backup output circuit being set in device shell;Remote control input circuit is the remote control access point of DTU, includes 3 SHJ relays, 3 STJ relays and 3 KKJ relays;Remote control output circuit is the remote control access point of switch operating box, including the auxiliary contact of 3 SHJ relays and the first auxiliary contact of 3 STJ relays;Locking backup output circuit selectively accesses backup power supply device, including the second auxiliary contact of 3 STJ relays and the auxiliary contact of 3 KKJ relays, respectively for accessing the KKJ access circuit of backup power supply device to realize the state discrimination method of following relay, and access the STJ access circuit of backup power supply device to realize the method of hand-jump relay direct locking.The device need not to transform switch operating box, can be seamlessly docked with DTU and backup power supply device, realize remote control locking backup power supply function, and application range is wide.

Description

Technical Field

[0001] This utility model relates to the field of automatic switching technology, specifically to an automatic switching remote control interlocking device. Background Technology

[0002] In the existing technology, due to the late standardization of secondary distribution systems, early distribution substations had incomplete secondary circuits. The 10kV switch operating box circuit lacked STJ and KKJ relays. Although local switch operation could achieve interlocking of standby switching by switching the handle to the "closed position", remote control operation of the DTU could not determine whether it was a stolen trip or a remote trip, resulting in the inability to properly interlock standby automatic switching and ultimately affecting the reliability of standby automatic switching.

[0003] There are two main methods for remote control tripping interlocking and automatic transfer backup: the closing relay (KKJ) status judgment method and the manual trip relay (STJ) direct interlocking method. Both the KKJ relay and the STJ relay come from the 10kV switch operation box.

[0004] (1) Method for determining the state of the relay (KKJ) after closing

[0005] Signal acquisition: Connect the closing relay (KKJ) node of the 10kV switch operation box to the dedicated input terminal of the "closing position" of the automatic transfer switch.

[0006] Logic implementation: The automatic transfer charging condition must be met simultaneously when the KKJ status of both 10kV circuit breakers in the closed position is "closed"; when either circuit breaker is manually (including remote control) opened, the corresponding KKJ node changes from "1" to "0", immediately triggering the automatic transfer interlock.

[0007] Technical features: It conforms to the traditional protection logic design habits; however, the automatic transfer switch must have the function of KKJ node logic judgment, and the operating circuits of the incoming line switch and the bus branch switch must have KKJ relays. The requirements for the automatic transfer switch and the switch operating circuit are high, and those that do not meet the conditions need to be modified.

[0008] (2) Direct interlocking method of manual trip relay (STJ)

[0009] Signal acquisition: Connect the manual trip relay (STJ) node of the main transformer 10kV switch operation box to the "general interlock" common input terminal of the automatic transfer switch.

[0010] Logic implementation: When any circuit breaker is manually tripped, the STJ node changes from "0" to "1", triggering the automatic transfer switch to lock out immediately; no charging status needs to be considered, and a fast lockout response can be achieved.

[0011] Technical features: fast response speed, simple and reliable logic; however, both the incoming line switch and the bus branch switch operation circuits require STJ relays. If the operation circuits do not distinguish between manual tripping (remote tripping) and protection tripping, the operation box device needs to be modified.

[0012] Therefore, whether the closing relay (KKJ) status judgment method or the manual trip relay (STJ) direct blocking method is adopted, the switch operation box needs to be modified. The modification requires power outage construction, which affects the reliability of power supply, and the modification cost is high and the construction period is long. Utility Model Content

[0013] The purpose of this utility model is to provide a remote control interlocking device for automatic transfer switch. This device does not require modification of the switch operation box and can be seamlessly connected with the DTU and the automatic transfer switch to realize the remote control interlocking and automatic transfer switch functions, and has a wide range of applications.

[0014] To achieve the above objectives, the technical solution adopted by this utility model is: a remote control interlocking device with automatic switching capability, comprising a device housing and a remote control input circuit, a remote control output circuit and an interlocking backup output circuit disposed within the device housing;

[0015] The remote control input circuit is the remote control access point of the DTU. The remote control input circuit includes 3 SHJ relays, 3 STJ relays, 3 KKJ relays, and resistors and diodes connected in conjunction with each relay.

[0016] The remote control output circuit is the remote control access point of the switch operation box. The remote control output circuit includes auxiliary contacts of 3 SHJ relays and first auxiliary contacts of 3 STJ relays. The remote control output circuit has a three-bay structure to accommodate two incoming line switches and one bus branch switch equipped with an automatic transfer device.

[0017] The interlocking backup output circuit is selectively connected to the automatic transfer switch. The interlocking backup output circuit includes the second auxiliary contacts of three STJ relays and the auxiliary contacts of three KKJ relays. The auxiliary contacts of the three KKJ relays are used to connect to the KKJ access circuit of the automatic transfer switch to realize the relay status discrimination method after closing. The second auxiliary contacts of the three STJ relays are used to connect to the STJ access circuit of the automatic transfer switch to realize the direct interlocking method of the manual trip relay.

[0018] Furthermore, the remote control input circuit includes 12 resistors and 12 diodes; the operating coil of the first KKJ relay is connected in parallel with the first diode and then in series with the first resistor to form a first wiring circuit; the coil of the first SHJ relay is connected in parallel with the second diode and then in series with the second resistor to form a second wiring circuit; after the first and second wiring circuits are connected in parallel, one end is connected to the first incoming remote control closing input terminal of the DTU, and the other end is connected to the negative terminal of the power supply via the negative terminal interface of the automatic transfer remote control interlocking device; the reset coil of the first KKJ relay is connected in parallel with the third diode and then in series with the third resistor to form a third wiring circuit; the coil of the first STJ relay is connected in parallel with the fourth diode and then in series with the fourth resistor. The fourth wiring circuit is formed; after the third and fourth wiring circuits are connected in parallel, one end is connected to the first incoming remote control tripping input terminal of the DTU, and the other end is connected to the negative terminal of the power supply via the negative terminal interface of the automatic transfer remote control interlocking device; the operating coil of the second KKJ relay is connected in parallel with the fifth diode and then in series with the fifth resistor to form the fifth wiring circuit; the coil of the second SHJ relay is connected in parallel with the sixth diode and then in series with the sixth resistor to form the sixth wiring circuit; after the fifth and sixth wiring circuits are connected in parallel, one end is connected to the second incoming remote control closing input terminal of the DTU, and the other end is connected to the negative terminal of the power supply via the negative terminal interface of the automatic transfer remote control interlocking device; the reset coil of the second KKJ relay is connected in parallel with the seventh diode and then in series with the fifth resistor to form the sixth wiring circuit; The seventh resistor is connected in series to form the seventh wiring circuit. The coil of the second STJ relay is connected in parallel with the eighth diode and then in series with the eighth resistor to form the eighth wiring circuit. After the seventh and eighth wiring circuits are connected in parallel, one end is connected to the DTU's busbar remote control tripping input terminal, and the other end is connected to the negative power supply terminal via the negative terminal interface of the backup automatic transfer remote control interlocking device. The operating coil of the third KKJ relay is connected in parallel with the ninth diode and then in series with the ninth resistor to form the ninth wiring circuit. The coil of the third SHJ relay is connected in parallel with the tenth diode and then in series with the tenth resistor to form the tenth wiring circuit. After the ninth and tenth wiring circuits are connected in parallel, one end is connected to the DTU's busbar remote control closing input terminal, and the other end is connected to the backup automatic transfer remote control interlocking device via the negative terminal interface of the backup automatic transfer remote control interlocking device. The negative terminal of the interlocking device is connected to the negative terminal of the power supply; the reset coil of the third KKJ relay is connected in parallel with the eleventh diode and then in series with the eleventh resistor to form the eleventh wiring circuit; the coil of the third STJ relay is connected in parallel with the twelfth diode and then in series with the twelfth resistor to form the twelfth wiring circuit; after the eleventh wiring circuit and the twelfth wiring circuit are connected in parallel, one end is connected to the third incoming remote control tripping input terminal of the DTU, and the other end is connected to the negative terminal of the power supply via the negative terminal of the backup automatic transfer remote control interlocking device; the positive terminal of the backup automatic transfer remote control interlocking device is connected to the positive terminal of the power supply, and three paths are led out to connect to the first incoming remote control common input terminal, the second incoming remote control common input terminal, and the bus and branch remote control common input terminal of the DTU respectively.

[0019] Furthermore, in the remote control output circuit, one end of the auxiliary contact of the first SHJ relay is connected to the first incoming remote control closing output terminal of the switch operation box, and the other end is connected to the first incoming remote control common output terminal of the switch operation box; one end of the first auxiliary contact of the first STJ relay is connected to the first incoming remote control opening output terminal of the switch operation box, and the other end is connected to the first incoming remote control common output terminal of the switch operation box; one end of the auxiliary contact of the second SHJ relay is connected to the second incoming remote control closing output terminal of the switch operation box, and the other end is connected to the second incoming remote control common output terminal of the switch operation box; one end of the first auxiliary contact of the second STJ relay is connected to the second incoming remote control opening output terminal of the switch operation box, and the other end is connected to the second incoming remote control common output terminal of the switch operation box; one end of the auxiliary contact of the third SHJ relay is connected to the bus and branch remote control closing output terminal of the switch operation box, and the other end is connected to the bus and branch remote control common output terminal of the switch operation box; one end of the first auxiliary contact of the third STJ relay is connected to the bus and branch remote control opening output terminal of the switch operation box, and the other end is connected to the bus and branch remote control common output terminal of the switch operation box.

[0020] Furthermore, in the interlocked standby output circuit, the second auxiliary contacts of the first STJ relay, the second auxiliary contacts of the second STJ relay, and the second auxiliary contacts of the third STJ relay are respectively used to connect the first incoming STJ auxiliary contacts, the second incoming STJ auxiliary contacts, and the bus branch STJ auxiliary contacts of the standby automatic transfer device. The auxiliary contacts of the first KKJ relay, the second KKJ relay, and the third KKJ relay are respectively used to connect the first incoming KKJ auxiliary contacts, the second incoming KKJ auxiliary contacts, and the bus branch KKJ auxiliary contacts of the standby automatic transfer device.

[0021] Furthermore, the front of the device housing is provided with a remote control interlocking auxiliary contact terminal block and a remote control terminal block. The wiring terminals on the remote control interlocking auxiliary contact terminal block are used to connect the automatic transfer switch and the power supply. The remote control terminal block includes remote control input terminals and remote control output terminals with three switch intervals. The terminal definitions are adapted to the interface standards of the DTU and the switch operation box, and are used to connect the DTU and the switch operation box respectively.

[0022] Furthermore, a grounding terminal is provided on the lower front of the device housing for connecting to the DTU cabinet grounding system to reduce electromagnetic interference.

[0023] Furthermore, the back of the device housing is provided with a snap-fit ​​structure, which is embedded into the guide rail of the DTU cabinet by snap-fit ​​connection.

[0024] Compared with existing technologies, this utility model has the following advantages: This device eliminates the need to modify 10kV switchgear operating boxes with incomplete circuits and can adapt to different types of automatic transfer switches (ATS) (different interlocking condition judgment types). It can simultaneously implement the KKJ state judgment method and the STJ direct interlocking method. Wiring can be selected on-site according to the type of ATS used, and it is compatible with 10kV switchgear operating boxes and ATS from different manufacturers. In contrast, existing technologies require the 10kV switchgear operating box to be matched with the ATS interlocking method. Furthermore, this device can be directly snapped into the DTU cabinet, consumes very little power, requires no extra space for installation, and does not affect the operation of existing equipment. Simultaneously, the device is simple and convenient to install; it only requires connecting the device to the DTU and leading out the interlocking auxiliary contacts, without affecting the operation of the original switch (modifying the 10kV switchgear operating box will affect equipment operation). The installation time is only half a day, far less than the time required to modify three 10kV switchgear operating boxes. Attached Figure Description

[0025] Figure 1 This is a block diagram illustrating the implementation principle of the automatic switching remote control interlocking device provided in this embodiment of the utility model.

[0026] Figure 2 This is a circuit diagram of the remote control input circuit in an embodiment of this utility model;

[0027] Figure 3 This is a circuit diagram of the remote control output circuit in an embodiment of this utility model;

[0028] Figure 4 This is a circuit diagram of the locked standby output circuit in an embodiment of this utility model;

[0029] Figure 5 This is a front view of the self-starting remote control interlocking device provided in this embodiment of the utility model;

[0030] Figure 6 This is a side view of the automatic remote control interlocking device provided in this embodiment of the utility model;

[0031] Figure 7 This is a schematic diagram of the terminal block definition of the automatic switching remote control interlocking device provided in this embodiment of the utility model. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] It should be noted that the following detailed descriptions are exemplary 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.

[0034] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments 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.

[0035] This embodiment provides a backup automatic switching remote control interlocking device, such as... Figure 1 As shown, the standby automatic transfer remote control interlocking device connects the DTU, the 10kV switchgear control box, and the standby automatic transfer device. The standby automatic transfer remote control interlocking device is connected in series in the remote control circuits of the incoming line switch and bus branch switch between the DTU and the 10kV switchgear control box. The standby automatic transfer remote control interlocking device recognizes the remote control operation from the master station, and the corresponding STJ and KKJ relays of the incoming line switch and bus branch switch are activated. Through the action of the auxiliary contacts of the STJ and KKJ relays, the remote control operation of the incoming line switch and bus branch switch is used to lock the standby automatic transfer function.

[0036] Specifically, the automatic transfer switch remote control interlocking device includes a device housing and a remote control input circuit, a remote control output circuit, and an interlocking backup output circuit disposed within the device housing. The remote control input circuit serves as the remote control access point for the DTU (Distributed Terminal Unit). The remote control input circuit includes three SHJ relays, three STJ relays, three KKJ relays, and twelve resistors and twelve diodes connected in conjunction with each relay. The remote control output circuit serves as the remote control access point for the 10kV switchgear operating box. The remote control output circuit includes auxiliary contacts of the three SHJ relays and the first auxiliary contacts of the three STJ relays. The remote control output circuit has a three-bay structure to accommodate the two incoming line switches and one bus branch switch equipped with the automatic transfer switch. The interlocking backup output circuit is selectively connected to the automatic transfer switch. The interlocking backup output circuit includes the second auxiliary contacts of three STJ relays and the auxiliary contacts of three KKJ relays. The auxiliary contacts of the three KKJ relays are used to connect to the KKJ access circuit of the automatic transfer switch to realize the relay status discrimination method after closing. The second auxiliary contacts of the three STJ relays are used to connect to the STJ access circuit of the automatic transfer switch to realize the direct interlocking method of the manual trip relay.

[0037] like Figure 2As shown, the remote control input circuit includes 12 resistors and 12 diodes; the operating coil of the first KKJ relay is connected in parallel with the first diode and then in series with the first resistor to form a first wiring circuit; the coil of the first SHJ relay is connected in parallel with the second diode and then in series with the second resistor to form a second wiring circuit; after the first and second wiring circuits are connected in parallel, one end is connected to the first incoming remote control closing input terminal of the DTU, and the other end is connected to the negative terminal of the power supply via the negative terminal interface of the automatic transfer remote control interlocking device; the reset coil of the first KKJ relay is connected in parallel with the third diode and then in series with the third resistor to form a third wiring circuit; the coil of the first STJ relay is connected in parallel with the fourth diode and then in series with the fourth resistor to form a third wiring circuit. The fourth wiring circuit; the third wiring circuit and the fourth wiring circuit are connected in parallel, one end of which is connected to the first incoming remote control tripping input terminal of the DTU, and the other end is connected to the negative terminal of the power supply via the negative terminal interface of the automatic transfer remote control interlocking device; the operating coil of the second KKJ relay is connected in parallel with the fifth diode and then in series with the fifth resistor to form the fifth wiring circuit; the coil of the second SHJ relay is connected in parallel with the sixth diode and then in series with the sixth resistor to form the sixth wiring circuit; the fifth wiring circuit and the sixth wiring circuit are connected in parallel, one end of which is connected to the second incoming remote control closing input terminal of the DTU, and the other end is connected to the negative terminal of the power supply via the negative terminal interface of the automatic transfer remote control interlocking device; the reset coil of the second KKJ relay is connected in parallel with the seventh diode and then in series with the fifth diode and the sixth diode to form the sixth wiring circuit; the operating ... Seven resistors are connected in series to form the seventh wiring circuit. The coil of the second STJ relay is connected in parallel with the eighth diode and then in series with the eighth resistor to form the eighth wiring circuit. After the seventh and eighth wiring circuits are connected in parallel, one end is connected to the DTU's busbar remote control tripping input terminal, and the other end is connected to the negative power supply terminal via the negative terminal interface of the backup automatic transfer remote control interlocking device. The operating coil of the third KKJ relay is connected in parallel with the ninth diode and then in series with the ninth resistor to form the ninth wiring circuit. The coil of the third SHJ relay is connected in parallel with the tenth diode and then in series with the tenth resistor to form the tenth wiring circuit. After the ninth and tenth wiring circuits are connected in parallel, one end is connected to the DTU's busbar remote control closing input terminal, and the other end is connected to the backup automatic transfer remote control interlocking device via the negative terminal interface of the backup automatic transfer remote control interlocking device. The negative terminal of the locking device is connected to the negative terminal of the power supply; the reset coil of the third KKJ relay is connected in parallel with the eleventh diode and then in series with the eleventh resistor to form the eleventh wiring circuit; the coil of the third STJ relay is connected in parallel with the twelfth diode and then in series with the twelfth resistor to form the twelfth wiring circuit; after the eleventh wiring circuit and the twelfth wiring circuit are connected in parallel, one end is connected to the third incoming remote control tripping input terminal of the DTU, and the other end is connected to the negative terminal of the power supply via the negative terminal of the backup automatic transfer remote control interlocking device; the positive terminal of the backup automatic transfer remote control interlocking device is connected to the positive terminal of the power supply, and three paths are led out to connect to the first incoming remote control common input terminal, the second incoming remote control common input terminal, and the main and branch remote control common input terminal of the DTU respectively.

[0038] When the circuit breaker is closed remotely, the SHJ relay activates, and the KKJ relay is energized and remains activated. When the circuit breaker is opened remotely, the STJ relay activates, and the KKJ relay is energized and resets to its inactive state. The device power supply can be connected in parallel with the DTU device, and the overall power consumption is no more than 2VA. If the DTU uses active remote control contacts, this device does not require a separate power supply, and the device power supply + and device power supply - connections do not need to be wired.

[0039] Among them, the main function of resistors and diodes is to protect circuit components and improve the reliability of the device.

[0040] The specific functions of a diode are: 1. Protecting circuit components. When the current in the relay coil suddenly drops, a self-induced electromotive force (EMF) is generated. Its direction is opposite to the power supply voltage, and its magnitude depends on the voltage turn-off speed and the coil inductance. Generally, it is larger than the power supply voltage and can easily break down the relay, leading to circuit damage. Connecting a diode in parallel allows the induced EMF generated by the coil to be dissipated through the circuit formed by the diode and the coil, thus protecting the relay. 2. Preventing power supply voltage fluctuations: The high back EMF generated when the relay coil is de-energized may be conducted to the power supply, causing voltage fluctuations. This not only affects the normal operation of the relay itself but may also damage other connected electronic devices. Connecting a diode in parallel can keep the power supply voltage stable. 3. Reducing electromagnetic interference: The high back EMF generated when the power is off will produce high-frequency electromagnetic interference signals in the circuit, affecting other devices. Connecting a diode in parallel can reduce the generation of high-frequency electromagnetic interference signals, thereby improving the overall circuit's anti-interference capability.

[0041] The specific functions of the resistor are: 1. Current limiting, reducing relay power consumption and protecting the relay from overheating or even damage; 2. Voltage division, ensuring that the relay coil voltage matches the supply voltage and ensuring reliable operation.

[0042] like Figure 3As shown, in the remote control output circuit, one end of the auxiliary contact of the first SHJ relay is connected to the first incoming line remote control closing output terminal of the 10kV switch operating box, and the other end is connected to the first incoming line remote control common output terminal of the 10kV switch operating box; one end of the first auxiliary contact of the first STJ relay is connected to the first incoming line remote control opening output terminal of the 10kV switch operating box, and the other end is connected to the first incoming line remote control common output terminal of the 10kV switch operating box; one end of the auxiliary contact of the second SHJ relay is connected to the second incoming line remote control closing output terminal of the 10kV switch operating box, and the other end is connected to the second... The incoming line remote control common output terminal; one end of the first auxiliary contact of the second STJ relay is connected to the second incoming line remote control tripping output terminal of the 10kV switch operating box, and the other end is connected to the second incoming line remote control common output terminal of the 10kV switch operating box; one end of the auxiliary contact of the third SHJ relay is connected to the busbar remote control closing output terminal of the 10kV switch operating box, and the other end is connected to the busbar remote control common output terminal of the 10kV switch operating box; one end of the first auxiliary contact of the third STJ relay is connected to the busbar remote control tripping output terminal of the 10kV switch operating box, and the other end is connected to the busbar remote control common output terminal of the 10kV switch operating box.

[0043] When the DTU is operated remotely, the corresponding relay auxiliary contacts are activated to enable remote switch operation.

[0044] like Figure 4 As shown, in the interlocked standby output circuit, the second auxiliary contacts of the first STJ relay, the second auxiliary contacts of the second STJ relay, and the second auxiliary contacts of the third STJ relay are respectively used to connect the first incoming STJ auxiliary contacts, the second incoming STJ auxiliary contacts, and the bus branch STJ auxiliary contacts of the standby automatic transfer device. The auxiliary contacts of the first KKJ relay, the second KKJ relay, and the third KKJ relay are respectively used to connect the first incoming KKJ auxiliary contacts, the second incoming KKJ auxiliary contacts, and the bus branch KKJ auxiliary contacts of the standby automatic transfer device.

[0045] When using the closing relay (KKJ) status judgment method, connect the outputs of 1KKJ, 2KKJ, and 3KKJ to the corresponding circuit of the standby automatic transfer device; when using the manual trip relay (STJ) direct interlocking method, connect the outputs of 1STJ, 2STJ, and 3STJ in parallel to the "general interlocking" common input terminal.

[0046] In this embodiment, the external structure of the backup automatic remote control interlocking device is as follows: Figure 5 , 6As shown. The front of the device housing is provided with a remote control interlocking auxiliary contact terminal block (X1) 1 and a remote control terminal block (X2) 2. The wiring terminals on the remote control interlocking auxiliary contact terminal block (X1) are used to connect the automatic transfer switch and the power supply. The remote control terminal block (X2) includes remote control input terminals and remote control output terminals in three switch bays. The terminal definitions are adapted to the interface standards of DTU and 10kV switch operation box, and are used to connect DTU and 10kV switch operation box respectively.

[0047] Terminal block definition as follows Figure 7 As shown. For the remote control interlocking auxiliary contact terminal block (X1), the definitions of each port are as follows:

[0048] Port 1: Incoming line 1STJ+

[0049] Port 2: Incoming line 1STJ-

[0050] Port 3: Incoming line 2STJ+

[0051] Port 4: Incoming line 2STJ-

[0052] Port 5: Parent STJ+

[0053] Port 6: Parent STJ-

[0054] Port 7: Incoming line 1KKJ+

[0055] Port 8: Incoming line 1KKJ-

[0056] Port 9: Incoming line 2KKJ+

[0057] Port 10: Incoming line 2KKJ-

[0058] Port 11: Parent KKJ+

[0059] Port 12: Mother KKJ-

[0060] Port 13: Device power +

[0061] Port 14: Device power supply -

[0062] For the remote control terminal block (X2), the ports are defined as follows:

[0063] Port 1: Input to remote control common terminal of incoming line 1

[0064] Port 2: Input line 1 for remote control

[0065] Port 3: Input line 1 for remote control

[0066] Port 4: Input line 2, remote control common terminal input

[0067] Port 5: Input line 2 for remote control

[0068] Port 6: Input line 2 for remote control

[0069] Port 7: Common input for both mains and branch lines remote control

[0070] Port 8: Main and branch remote control input

[0071] Port 9: Main and branch remote control input

[0072] Port 10: Input line 1, remote control common terminal output

[0073] Port 11: Input line 1, remote control output

[0074] Port 12: Input line 1, remote control output

[0075] Port 13: Input Line 2, Remote Control Common Terminal Output

[0076] Port 14: Input line 2, remote control output combined

[0077] Port 15: Input line 2, remote control output

[0078] Port 16: Common output for both mains and branch lines remote control

[0079] Port 17: Main and branch remote control output

[0080] Port 18: Mains / Distributor Remote Control Output

[0081] A grounding terminal 4 is provided on the lower front of the device housing for connecting to the DTU cabinet grounding system to reduce electromagnetic interference. A snap-fit ​​structure 3 is provided on the back of the device housing. The snap-fit ​​structure 3 is embedded into the guide rail of the DTU cabinet by snap-fit ​​guide rail to realize the connection between the standby automatic transfer remote control interlocking device and the DTU cabinet.

[0082] This utility model provides a remote control interlocking device for automatic transfer switches (ATS), which can be implemented without modifying an incomplete 10kV control box. This device is adaptable to different types of ATS devices (different interlocking condition judgment types), and can simultaneously implement both the closing relay (KKJ) status judgment method and the manual trip relay (STJ) direct interlocking method. Wiring can be selected on-site according to the type of ATS device used. This device can be directly snapped into the DTU cabinet, has very low power consumption, requires no extra space for installation, and does not affect the operation of existing equipment. Modification of this device is simple and convenient; it only requires connecting it in series with the incoming line switch and bus branch switch circuits, and introducing the interlocking auxiliary contacts into the ATS device.

[0083] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its scope of protection shall still fall within the protection scope of this utility model.

Claims

1. A remote-controlled interlocking device with automatic switching capability, characterized in that, Includes the device housing and the remote control input circuit, remote control output circuit and interlocking backup output circuit disposed within the device housing; The remote control input circuit is the remote control access point of the DTU. The remote control input circuit includes 3 SHJ relays, 3 STJ relays, 3 KKJ relays, and resistors and diodes connected in conjunction with each relay. The remote control output circuit is the remote control access point of the switch operation box. The remote control output circuit includes auxiliary contacts of 3 SHJ relays and first auxiliary contacts of 3 STJ relays. The remote control output circuit has a three-bay structure to accommodate two incoming line switches and one bus branch switch equipped with an automatic transfer device. The interlocking backup output circuit is selectively connected to the automatic transfer switch. The interlocking backup output circuit includes the second auxiliary contacts of three STJ relays and the auxiliary contacts of three KKJ relays. The auxiliary contacts of the three KKJ relays are used to connect to the KKJ access circuit of the automatic transfer switch to realize the relay status discrimination method after closing. The second auxiliary contacts of the three STJ relays are used to connect to the STJ access circuit of the automatic transfer switch to realize the direct interlocking method of the manual trip relay.

2. The automatic switching remote control interlocking device according to claim 1, characterized in that, The remote control input circuit includes 12 resistors and 12 diodes; the operating coil of the first KKJ relay is connected in parallel with the first diode and then in series with the first resistor to form a first wiring circuit; the coil of the first SHJ relay is connected in parallel with the second diode and then in series with the second resistor to form a second wiring circuit; after the first and second wiring circuits are connected in parallel, one end is connected to the first incoming remote control closing input terminal of the DTU, and the other end is connected to the negative terminal of the power supply via the negative terminal interface of the automatic transfer remote control interlocking device; the reset coil of the first KKJ relay is connected in parallel with the third diode and then in series with the third resistor to form a third wiring circuit; the coil of the first STJ relay is connected in parallel with the fourth diode and then in series with the fourth resistor to form a fourth wiring circuit. Wiring circuits: The third and fourth wiring circuits are connected in parallel, with one end connected to the first incoming remote control tripping input terminal of the DTU, and the other end connected to the negative terminal of the power supply via the negative terminal interface of the automatic transfer remote control interlocking device; the operating coil of the second KKJ relay is connected in parallel with the fifth diode and then in series with the fifth resistor to form the fifth wiring circuit; the coil of the second SHJ relay is connected in parallel with the sixth diode and then in series with the sixth resistor to form the sixth wiring circuit; the fifth and sixth wiring circuits are connected in parallel, with one end connected to the second incoming remote control closing input terminal of the DTU, and the other end connected to the negative terminal of the power supply via the negative terminal interface of the automatic transfer remote control interlocking device; the reset coil of the second KKJ relay is connected in parallel with the seventh diode and then in series with the seventh... The resistors are connected in series to form the seventh wiring circuit. The coil of the second STJ relay is connected in parallel with the eighth diode and then in series with the eighth resistor to form the eighth wiring circuit. After the seventh and eighth wiring circuits are connected in parallel, one end is connected to the DTU's busbar remote control tripping input terminal, and the other end is connected to the negative power supply terminal via the negative terminal interface of the backup automatic transfer remote control interlocking device. The operating coil of the third KKJ relay is connected in parallel with the ninth diode and then in series with the ninth resistor to form the ninth wiring circuit. The coil of the third SHJ relay is connected in parallel with the tenth diode and then in series with the tenth resistor to form the tenth wiring circuit. After the ninth and tenth wiring circuits are connected in parallel, one end is connected to the DTU's busbar remote control closing input terminal, and the other end is connected to the backup automatic transfer remote control interlocking device via the negative terminal interface of the backup automatic transfer remote control interlocking device. The negative terminal of the locking device is connected to the negative terminal of the power supply; the reset coil of the third KKJ relay is connected in parallel with the eleventh diode and then in series with the eleventh resistor to form the eleventh wiring circuit; the coil of the third STJ relay is connected in parallel with the twelfth diode and then in series with the twelfth resistor to form the twelfth wiring circuit; after the eleventh wiring circuit and the twelfth wiring circuit are connected in parallel, one end is connected to the third incoming remote control tripping input terminal of the DTU, and the other end is connected to the negative terminal of the power supply via the negative terminal of the backup automatic transfer remote control interlocking device; the positive terminal of the backup automatic transfer remote control interlocking device is connected to the positive terminal of the power supply, and three paths are led out to connect to the first incoming remote control common input terminal, the second incoming remote control common input terminal, and the main and branch remote control common input terminal of the DTU respectively.

3. The automatic switching remote control interlocking device according to claim 1, characterized in that, In the remote control output circuit, one end of the auxiliary contact of the first SHJ relay is connected to the first incoming remote control closing output terminal of the switch operation box, and the other end is connected to the first incoming remote control common output terminal of the switch operation box; one end of the first auxiliary contact of the first STJ relay is connected to the first incoming remote control opening output terminal of the switch operation box, and the other end is connected to the first incoming remote control common output terminal of the switch operation box; one end of the auxiliary contact of the second SHJ relay is connected to the second incoming remote control closing output terminal of the switch operation box, and the other end is connected to the second incoming remote control common output terminal of the switch operation box; one end of the first auxiliary contact of the second STJ relay is connected to the second incoming remote control opening output terminal of the switch operation box, and the other end is connected to the second incoming remote control common output terminal of the switch operation box; one end of the auxiliary contact of the third SHJ relay is connected to the bus and branch remote control closing output terminal of the switch operation box, and the other end is connected to the bus and branch remote control common output terminal of the switch operation box; one end of the first auxiliary contact of the third STJ relay is connected to the bus and branch remote control opening output terminal of the switch operation box, and the other end is connected to the bus and branch remote control common output terminal of the switch operation box.

4. The automatic switching remote control interlocking device according to claim 1, characterized in that, In the interlocked standby output circuit, the second auxiliary contacts of the first STJ relay, the second auxiliary contacts of the second STJ relay, and the second auxiliary contacts of the third STJ relay are respectively used to connect the first incoming STJ auxiliary contacts, the second incoming STJ auxiliary contacts, and the bus branch STJ auxiliary contacts of the standby automatic transfer device. The auxiliary contacts of the first KKJ relay, the second KKJ relay, and the third KKJ relay are respectively used to connect the first incoming KKJ auxiliary contacts, the second incoming KKJ auxiliary contacts, and the bus branch KKJ auxiliary contacts of the standby automatic transfer device.

5. The automatic switching remote control interlocking device according to claim 1, characterized in that, The front of the device housing is provided with a remote control interlocking auxiliary contact terminal block and a remote control terminal block. The wiring terminals on the remote control interlocking auxiliary contact terminal block are used to connect the automatic transfer switch and the power supply. The remote control terminal block includes remote control input terminals and remote control output terminals with three switch intervals. The terminal definitions are adapted to the interface standards of the DTU and the switch operation box, and are used to connect the DTU and the switch operation box respectively.

6. The automatic switching remote control interlocking device according to claim 1, characterized in that, A grounding terminal is provided on the lower front of the device housing for connecting to the DTU cabinet grounding system to reduce electromagnetic interference.

7. The automatic switching remote control interlocking device according to claim 1, characterized in that, The back of the device housing is provided with a snap-fit ​​structure, which is embedded into the guide rail of the DTU cabinet by snap-fit ​​connection.

Images