Feeder loop circuit

Abstract

The utility model relates to a feeder loop circuit which is connected to a master control device on a main circuit through a control circuit. The control circuit controls the on and off of the main circuit; a feeder line control device is arranged in the control circuit; the feeder line control device is connected into the control circuit; the output of the control circuit is controlled according to the voltage, the current and the leakage current monitored by the feeder line control device; and starting and stopping of the main circuit are controlled. The technical effects of high control precision and fewer feeder loop circuit faults are realized, and the technical problems that a feeder loop in an existing electrical cabinet control circuit adopts a relay control loop, the number of control components is large, the control loop is complex, the control precision is reduced, and the control cost is low are solved. And therefore, the technical problem that the feeder loop circuit has many faults is solved.

Description

Technical Field

[0001] The embodiment of the utility model relates to an electrical cabinet control circuit, and in particular to a feeder loop circuit. Background Art

[0002] The feeder circuits in existing electrical cabinet control circuits all use relay control circuits, which use a large number of control components, making the control circuit more complex, resulting in reduced control accuracy, and thus causing more feeder circuit faults. Utility Model Content

[0003] The embodiment of the present utility model aims to provide a feeder loop circuit with high control accuracy and fewer feeder loop circuit faults.

[0004] In order to achieve the above objectives, the embodiment of the present invention designs a feeder loop circuit, including:

[0005] Main circuit;

[0006] A control circuit, connected to a main control device on the main circuit through the control circuit; the control circuit controls the start and stop of the main circuit;

[0007] A feeder control device is provided in the control circuit; the feeder control device is connected to the control circuit; the output of the control circuit is controlled according to the voltage, current, and leakage current monitored by the feeder control device; until the start and stop of the main circuit are controlled.

[0008] Furthermore, in the feeder loop circuit of the present invention, the main circuit further includes:

[0009] Incoming power supply;

[0010] A circuit breaker, wherein the incoming power supply is connected to the incoming terminal of the circuit breaker;

[0011] An outgoing power supply is connected to the outgoing terminal of the circuit breaker; at the same time, the outgoing power supply is connected to the feeder control device;

[0012] Current transformers, connected to the three phases of the outgoing power supply respectively;

[0013] A leakage current transformer is connected to the three phases of the outgoing power supply and is located below the current transformer.

[0014] Furthermore, in the feeder loop circuit of the present invention, the output end of the leakage transformer is connected to the feeder control device.

[0015] Furthermore, in the feeder loop circuit of the present invention, the current transformer further includes:

[0016] A first current transformer is provided on phase A of the outgoing power supply;

[0017] A second current transformer is provided on phase B of the outgoing power supply;

[0018] A third current transformer is provided on phase C of the outgoing power supply;

[0019] The output ends of the first current transformer, the second current transformer, and the third current transformer are all connected to the feeder control device.

[0020] Furthermore, in the feeder loop circuit of the present invention, the control circuit further includes:

[0021] A first control power supply; the first control power supply is connected to one phase of the output terminal of the circuit breaker;

[0022] A second control power supply; the second control power supply is connected to one phase of the incoming terminal of the circuit breaker;

[0023] A first fuse, a first control power supply connected to the inlet of the first fuse; an outlet of the first fuse; respectively connected to the inlet of the normally closed switch of the travel switch, the power supply of the feeder control device, and the inlet of the first auxiliary contact of the circuit breaker; the outlet of the first auxiliary contact of the circuit breaker is connected to the inlet of the coil of the first relay; the outlet of the coil of the first relay is connected to the neutral line;

[0024] The second fuse, the second control power supply is connected to the inlet terminal of the second fuse; the outlet terminal of the second fuse is respectively connected to the inlet terminal of the normally open switch of the travel switch; the outlet terminal of the normally open switch of the travel switch is connected to the outlet terminal of the normally closed switch of the travel switch, the inlet terminal of the second auxiliary contact of the circuit breaker, the inlet terminal of the first relay contact, one side of the output terminal of the feeder control device, and the external jumper inlet terminal;

[0025] The outgoing terminal of the second auxiliary contact of the circuit breaker is connected to one end of the second relay coil;

[0026] The first relay contact outlet is connected to one end of the indicator light;

[0027] The other side of the output end of the feeder control device is connected to one end of the circuit breaker coil;

[0028] The external jumper terminal is connected in parallel to one end of the circuit breaker coil;

[0029] The other end of the circuit breaker coil, the other end of the indicator light, and the other end of the second relay coil are all connected to the neutral line.

[0030] Furthermore, in the feeder loop circuit described in the present invention, the feeder control device is an LL500S-DL controller.

[0031] Furthermore, in the feeder loop circuit described in the present invention, the S1 ends of the first current transformer, the second current transformer and the third current transformer are connected to the feeder control device; and the S2 ends of the first current transformer, the second current transformer and the third current transformer are grounded.

[0032] Furthermore, in the feeder loop circuit described in the present invention, three phases of the outgoing power supply are connected to the feeder control device.

[0033] Furthermore, in the feeder loop circuit of the present invention, the first input end of the feeder control device is connected to the control end of the leakage transformer.

[0034] Furthermore, in the feeder loop circuit of the present invention, the second input end of the feeder control device is connected to both ends of the contact of the second relay.

[0035] Compared with the prior art, the utility model adopts a main control device connected to the main circuit through a control circuit; the control circuit controls the start and stop of the main circuit; a feeder control device is set in the control circuit; the feeder control device is connected to the control circuit; the output of the control circuit is controlled according to the voltage, current and leakage current monitored by the feeder control device; until the start and stop of the main circuit are controlled; the technical effect of high control accuracy and fewer feeder loop circuit failures is achieved, and the technical problem that the feeder loop in the existing electrical cabinet control circuit adopts a relay control circuit, which adopts a large number of control components, makes the control loop more complicated, causes the control accuracy to decrease, and thus causes more feeder loop circuit failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the electrical connection of the main circuit of the utility model;

[0037] Figure 2 This is a schematic diagram of the electrical connection of the control circuit of the utility model

[0038] Figure 3 This is a connection diagram of the feeder control device in the present invention. DETAILED DESCRIPTION

[0039] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will appreciate that many technical details are provided in various embodiments of the present invention to facilitate a better understanding of the present application. However, even without these technical details and the various variations and modifications based on the following embodiments, the technical solutions claimed in the claims of this application can be achieved.

[0040] The first embodiment of the present invention relates to a feeder loop circuit, such as Figure 1 、 Figure 2 、 Figure 3 Shown, including:

[0041] The main circuit in this embodiment is the main circuit of the feeder loop circuit;

[0042] It is connected to the main control device on the main circuit through the control circuit; the control circuit controls the start and stop of the main circuit; in this embodiment, the control circuit is used to control the main circuit of the feeder loop circuit to realize the circuit of the feeding electrical cabinet.

[0043] A feeder control unit FCU is provided in a control circuit; the feeder control unit FCU is connected to the control circuit; the output of the control circuit is controlled according to the voltage, current and leakage current monitored by the feeder control unit FCU; until the start and stop of the main circuit are controlled; the technical effects of high control accuracy and fewer feeder loop circuit failures are achieved, and the technical problem that the feeder loops in the existing electrical cabinet control circuits all adopt relay control circuits, which adopt more control components, making the control loop more complicated, resulting in reduced control accuracy, and thus causing more feeder loop circuit failures is solved.

[0044] In order to achieve the above technical effects, in the feeder loop circuit of this embodiment, as shown in FIG. Figure 1 、 Figure 2 、 Figure 3 As shown, the main circuit also includes:

[0045] Incoming power supply L1, L2, L3, N;

[0046] The incoming power sources L1, L2, L3, and N are connected to the incoming terminals of the circuit breaker QF. The circuit breaker QF is used to control the on / off of the feeder loop circuit in this embodiment.

[0047] Outgoing power supplies L11, L12, L13, N, connect the outgoing power supplies L11, L12, L13, N to the outgoing terminals of the circuit breaker QF; at the same time, connect the outgoing power supplies L11, L12, L13, N to the feeder control unit FCU;

[0048] Current transformers TA1, TA2, TA3 are connected to the three phases of the outgoing power supply L11, L12, L13, N respectively; the current transformers TA1, TA2, TA3 are used to detect the current size of the outgoing power supply L11, L12, L13, N.

[0049] A leakage current transformer (TA0) is connected below the current transformers (TA1, TA2, and TA3) on the three phases of the outgoing power supply (L11, L12, L13, and N). This transformer detects leakage current in the outgoing power supply (L11, L12, L13, and N), thus providing a leakage detection function. The above main circuit structure enables power supply by switching the circuit breaker (QF) on and off.

[0050] In order to achieve the above technical effects, in the feeder loop circuit of this embodiment, as shown in FIG. Figure 1 、 Figure 2 、 Figure 3 As shown, the output end of the leakage transformer TA0 is connected to the feeder control unit FCU. The leakage transformer TA0 is used to control the leakage protection during the feeding process.

[0051] In order to achieve the above technical effects, in the feeder loop circuit of this embodiment, as shown in FIG. Figure 1 、 Figure 2 、 Figure 3 As shown, the current transformers TA1, TA2, and TA3 also include:

[0052] A first current transformer TA1 is provided on phase A of the outgoing power supply L11, L12, L13, and N;

[0053] A second current transformer TA2 is provided on the B phase of the outgoing power supply L11, L12, L13, N;

[0054] A third current transformer TA3 is provided on phase C of the outgoing power supply L11, L12, L13, and N;

[0055] The outputs of the first, second, and third current transformers TA1, TA2, and TA3 are all connected to the feeder control unit (FCU). The FCU detects the current values ​​in these transformers, thereby controlling the current in the main circuit.

[0056] In order to achieve the above technical effects, in the feeder loop circuit of this embodiment, as shown in FIG. Figure 1 、 Figure 2 、 Figure 3 As shown, the control circuit further includes:

[0057] The first control power supply L3 is connected to one phase of the outgoing terminal of the circuit breaker QF;

[0058] The second control power supply L13 is connected to one of the phases of the incoming line terminal of the circuit breaker QF; the first control power supply L3 and the second control power supply L13 realize dual power supply control, and the feeder control unit FCU can still maintain power supply even when the circuit breaker QF is not working.

[0059] The first fuse FU1 and the first control power supply L3 are connected to the incoming terminal of the first fuse FU1; the outgoing terminal of the first fuse FU1 is respectively connected to the incoming terminal of the normally closed limit switch S20, the power supply of the feeder control unit FCU, and the incoming terminal of the first auxiliary contact QF1 of the circuit breaker; the outgoing terminal of the first auxiliary contact QF1 of the circuit breaker is connected to the incoming terminal of the coil KA1 of the first relay; the outgoing terminal of the coil KA1 of the first relay is connected to the neutral line N;

[0060] The second fuse FU2 and the second control power supply L13 are connected to the inlet of the second fuse FU2; the outlet of the second fuse FU2 is respectively connected to the inlet of the normally open limit switch S20-1; the outlet of the normally open limit switch S20-1 is connected to the outlet of the normally closed limit switch S20, the inlet of the second auxiliary contact QF2 of the circuit breaker, the inlet of the first relay contact KA1-1, one side of the output terminal FCU-1 of the feeder control unit, and the external jumper inlet terminal KAF;

[0061] The outgoing terminal of the second auxiliary contact QF2 of the circuit breaker is connected to one end of the second relay coil KA; the auxiliary extension function of the second relay is realized

[0062] The outgoing terminal of the first relay contact KA1-1 is connected to one end of the indicator light HR, thereby realizing the closing indication of the circuit breaker QF.

[0063] The other side of the output terminal FCU-1 of the feeder control unit is connected to one end of the QF coil of the circuit breaker; thus realizing the ground protection tripping function of the feeder control unit FCU.

[0064] The external inter-tripping terminal KAF is connected in parallel to one end of the circuit breaker QF coil to realize the external inter-tripping function.

[0065] The other end of the circuit breaker coil QF, the other end of the indicator light HR, and the other end of the second relay coil KA are all connected to the neutral line N. This realizes functions such as auxiliary expansion, closing indication, ground protection tripping, and external tripping.

[0066] In order to achieve the above technical effects, in the feeder loop circuit of this embodiment, as shown in FIG. Figure 1 、 Figure 2 、 Figure 3 As shown, the feeder control unit FCU is the LL500S-DL controller.

[0067] In order to achieve the above technical effects, in the feeder loop circuit of this embodiment, as shown in FIG. Figure 1 、 Figure 2 、 Figure 3 As shown, the S1 terminals of the first current transformer TA1, the second current transformer TA2, and the third current transformer TA3 are connected to the feeder control unit FCU; the S2 terminals of the first current transformer TA1, the second current transformer TA2, and the third current transformer TA3 are grounded, thereby realizing the current detection function of the feeder control unit FCU.

[0068] In order to achieve the above technical effects, in the feeder loop circuit of this embodiment, as shown in FIG. Figure 1 、 Figure 2 、 Figure 3 As shown, the three phases of the outgoing power supply are connected to the feeder control unit FCU to realize the voltage detection function of the feeder control unit FCU.

[0069] In order to achieve the above technical effects, in the feeder loop circuit of this embodiment, as shown in FIG. Figure 1 、 Figure 2 、 Figure 3 As shown, the first input terminal of the feeder control unit FCU is connected to the control terminal of the leakage transformer TA0, thereby realizing the leakage current detection function of the feeder control unit FCU.

[0070] In order to achieve the above technical effects, in the feeder loop circuit of this embodiment, as shown in FIG. Figure 1 、 Figure 2 、 Figure 3 As shown, the second input terminal of the feeder control unit FCU is connected to the two ends of the second relay contact KA-1. This detects whether the second control power supply L13 is enabled. If the second relay contact KA-1 is closed, the second control power supply L13 is enabled. If the second relay contact KA-1 is open, the second control power supply L13 is not enabled.

[0071] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A feeder loop circuit, characterized in that: include: Main circuit; a control circuit connected to a main control device on the main circuit through the control circuit; The control circuit controls the start and stop of the main circuit; a feeder control device, the feeder control device being provided in the control circuit; The feeder control device is connected to the control circuit; The output of the control circuit is controlled according to the voltage, current and leakage current monitored by the feeder control device, until the start and stop of the main circuit are controlled.

2. The feeder loop circuit according to claim 1, characterized in that: The main circuit further includes: Incoming power supply; A circuit breaker, wherein the incoming power supply is connected to the incoming terminal of the circuit breaker; An outgoing power supply is connected to the outgoing terminal of the circuit breaker; at the same time, the outgoing power supply is connected to the feeder control device; Current transformers, connected to the three phases of the outgoing power supply respectively; A leakage transformer is provided on the three phases of the outgoing power supply; the leakage transformer is connected below the current transformer.

3. The feeder loop circuit according to claim 2, characterized in that: The output end of the leakage transformer is connected to the feeder control device.

4. The feeder loop circuit according to claim 2, characterized in that: The current transformer further includes: A first current transformer is provided on phase A of the outgoing power supply; A second current transformer is provided on phase B of the outgoing power supply; A third current transformer is provided on phase C of the outgoing power supply; The output ends of the first current transformer, the second current transformer, and the third current transformer are all connected to the feeder control device.

5. The feeder loop circuit according to claim 1, characterized in that: The control circuit further includes: A first control power supply; the first control power supply is connected to one phase of the output terminal of the circuit breaker; A second control power supply; the second control power supply is connected to one phase of the incoming terminal of the circuit breaker; A first fuse, a first control power supply connected to the inlet of the first fuse; an outlet of the first fuse; respectively connected to the inlet of the normally closed switch of the travel switch, the power supply of the feeder control device, and the inlet of the first auxiliary contact of the circuit breaker; the outlet of the first auxiliary contact of the circuit breaker is connected to the inlet of the coil of the first relay; the outlet of the coil of the first relay is connected to the neutral line; The second fuse, the second control power supply is connected to the inlet terminal of the second fuse; the outlet terminal of the second fuse is respectively connected to the inlet terminal of the normally open switch of the travel switch; the outlet terminal of the normally open switch of the travel switch is connected to the outlet terminal of the normally closed switch of the travel switch, the inlet terminal of the second auxiliary contact of the circuit breaker, the inlet terminal of the first relay contact, one side of the output terminal of the feeder control device, and the external jumper inlet terminal; The outgoing terminal of the second auxiliary contact of the circuit breaker is connected to one end of the second relay coil; The first relay contact outlet is connected to one end of the indicator light; The other side of the output end of the feeder control device is connected to one end of the circuit breaker coil; The external jumper terminal is connected in parallel to one end of the circuit breaker coil; The other end of the circuit breaker coil, the other end of the indicator light, and the other end of the second relay coil are all connected to the neutral line.

6. The feeder loop circuit according to claim 1, characterized in that: The feeder control device is the LL500S-DL controller.

7. The feeder loop circuit according to claim 6, characterized in that: The feeder control device is connected to the S1 end of the first current transformer, the second current transformer and the third current transformer; the S2 end of the first current transformer, the second current transformer and the third current transformer is grounded.

8. The feeder loop circuit according to claim 6, characterized in that: The three phases of the outgoing power supply are connected to the feeder control device.

9. The feeder loop circuit according to claim 6, characterized in that: The first input terminals of the feeder control device are respectively connected to control terminals of the leakage transformers.

10. The feeder loop circuit according to claim 6, characterized in that: The second input end of the feeder control device is connected to both ends of the contact of the second relay.

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