Single-bus segmented electrical main wiring power supply switching device

Abstract

The utility model relates to the field of safe and stable power supply of an electric power system, in particular to a single-bus segmented electrical main wiring power supply switching device, which is characterized in that an auxiliary contact of a circuit breaker I, an auxiliary contact of a circuit breaker II and an auxiliary contact of a bus tie circuit breaker are respectively connected with a power supply switching box; the output end of the circuit breaker I is connected with the input end of the bus tie circuit breaker, the output end of the circuit breaker II is connected with the output end of the bus tie circuit breaker, the input end of the bus tie circuit breaker is connected with the section I bus, and the output end of the bus tie circuit breaker is connected with the section II bus. The utility model has the advantages that the bus coupler control loop is adopted, if power supply of the I-section low-voltage bus or the II-section low-voltage bus fails and is under-voltage, the II-section low-voltage bus or the I-section low-voltage bus can be quickly and automatically switched for power supply, a watch man does not need to arrive at a site to manually switch a working power supply for power supply, and the structure is simple; the power switching box is arranged in the power transformation and distribution station, the transformation construction amount is small, the environment is good, and point inspection and maintenance are easy.

Description

TECHNICAL FIELD

[0001] The utility model relates to the safe and stable power supply field of electric power system especially relates to a single bus section type electrical main wiring power switching device. BACKGROUND

[0002] The transformer substation of single bus section type electrical main wiring usually adopts two working power supplies, and the transformer substation is manned, so when one working power supply fails, the on-duty personnel is informed to reach the transformer substation through an intercom system or a telephone, and the working power supply is manually switched to another working power supply, which prolongs the time for the working power supply to resume power supply and seriously affects the safety production of enterprises. SUMMARY

[0003] The utility model discloses a single bus section type electrical main wiring power switching device, which does not need on-duty personnel to reach the scene to manually switch the working power supply, realizes quick switching of dual power supply, and ensures safety production.

[0004] To achieve the above object, the utility model discloses the following technical scheme:

[0005] A single bus section type electrical main wiring power switching device, comprising a circuit breaker one, a circuit breaker two, a bus tie circuit breaker and a power switching box, wherein the auxiliary contact of the circuit breaker one, the auxiliary contact of the circuit breaker two and the auxiliary contact of the bus tie circuit breaker are connected with the power switching box; the output end of the circuit breaker one is connected with the input end of the bus tie circuit breaker; the output end of the circuit breaker two is connected with the output end of the bus tie circuit breaker; the input end of the bus tie circuit breaker is connected with a section I bus; and the output end of the bus tie circuit breaker is connected with a section II bus.

[0006] The input end of the circuit breaker one is connected with an incoming line power supply one, and the input end of the circuit breaker two is connected with an incoming line power supply two; the output end of the incoming line power supply one is connected with a transformer one, and the output end of the incoming line power supply two is connected with a transformer two; and the voltage of the incoming line power supply one and the incoming line power supply two is the same.

[0007] The power switching box comprises a section I bus control loop, a section II bus control loop and a bus tie control loop; the section I bus control loop is connected with the output end of the circuit breaker one; the section II bus control loop is connected with the output end of the circuit breaker two; and the bus tie control loop is connected with the output end of the bus tie circuit breaker.

[0008] The section I bus control loop comprises a closing and opening branch I and a closing interlock branch I, and the closing and opening branch I is connected in parallel with the closing interlock branch I.

[0009] The section II bus control loop comprises a closing and opening branch II and a closing interlock branch II, and the closing and opening branch II is connected in parallel with the closing interlock branch II.

[0010] The bus tie control circuit comprises a switching-on and off branch III, a switching-on interlock branch IIIa and a switching-on interlock branch IIIb. The switching-on and off branch III is connected in parallel with the switching-on interlock branch IIIb, and the switching-on interlock branch IIIa is connected with the switching-on and off branch III.

[0011] The switching-on and off branch I comprises a switching-off branch I and a switching-on branch I. The switching-on branch I is connected in series with the normally open contact of the bus selector switch SWC1, and the switching-on branch I is connected in parallel with the switching-off branch I. The switching-on interlock branch I comprises the coil of the relay KA1, the normally open auxiliary contact one of the bus tie circuit breaker and the normally open auxiliary contact two of the circuit breaker two connected in series.

[0012] The switching-on branch I comprises the switching-on coil of the circuit breaker one, the normally closed auxiliary contact one of the circuit breaker one, the normally closed contact of the relay KA1 and the switching-on button SC1 connected in series.

[0013] The switching-off branch I comprises the switching-off coil of the circuit breaker one, the normally open auxiliary contact one of the circuit breaker one and the switching-off button SO1 connected in series.

[0014] The switching-on and off branch II comprises a switching-off branch II and a switching-on branch II. The switching-on branch II is connected in series with the normally open contact of the bus selector switch SWC2, and the switching-on branch II is connected in parallel with the switching-off branch II. The switching-on interlock branch II comprises the coil of the relay KA2, the normally open auxiliary contact two of the bus tie circuit breaker and the normally open auxiliary contact two of the circuit breaker one connected in series.

[0015] The switching-on branch I comprises the switching-on coil of the circuit breaker two, the normally closed auxiliary contact one of the circuit breaker two, the normally closed contact of the relay KA2 and the switching-on button SC2 connected in series.

[0016] The switching-off branch I comprises the switching-off coil of the circuit breaker two, the normally open auxiliary contact one of the circuit breaker two and the switching-off button SO2 connected in series.

[0017] The switching-on and off branch III comprises a switching-off branch III, a switching-on branch III and a linkage branch. The switching-on branch III is connected in series with the normally open contact one of the bus selector switch SWC3, and the linkage branch comprises the normally open contact two of the bus selector switch SWC3 and the normally open contact of the time delay relay KT connected in series.

[0018] The switching-on interlock branch IIIa comprises the normally closed auxiliary contact two of the circuit breaker one and the coil of the time delay relay KT connected in series. The normally closed auxiliary contact two of the circuit breaker one is connected in parallel with the normally closed auxiliary contact two of the circuit breaker two, and the other end of the normally closed auxiliary contact two of the circuit breaker one is connected with the normally open contact two of the bus selector switch SWC3.

[0019] The switching-on interlock branch IIIb comprises the coil of the relay KA3, the normally open auxiliary contact three of the circuit breaker one and the normally open auxiliary contact three of the circuit breaker two connected in series.

[0020] The closing branch III includes the closing coil of the circuit breaker three, the normally closed auxiliary contact of the circuit breaker three, the normally closed contact of the relay KA3, and the closing button SC3; the connection point of the normally closed contact of the KA3 and the closing button SC3 is connected with the other end of the normally open contact of the time delay relay KT;

[0021] The opening branch III includes the opening coil of the circuit breaker three, the normally open auxiliary contact four of the circuit breaker three, and the opening button SO3.

[0022] The I section bus is used for being connected with the AC load one, and the II section bus is used for being connected with the AC load two.

[0023] The transformer one and the transformer two are arranged in the transformer substation.

[0024] The circuit breaker one, the circuit breaker two, and the bus-tie circuit breaker adopt the universal circuit breaker, and the universal circuit breaker includes an energy storage motor, a micro switch S, an opening coil, and a closing coil.

[0025] The power switching box is arranged in the transformer substation.

[0026] Compared with the prior art, the power switching box is arranged in the transformer substation, the amount of reconstruction construction is small, the environment is good, and the point inspection and maintenance are easy.

[0027] 1. The power switching box is arranged in the transformer substation, the amount of reconstruction construction is small, the environment is good, and the point inspection and maintenance are easy.

[0028] 2. The power switching box is arranged in the transformer substation, the amount of reconstruction construction is small, the environment is good, and the point inspection and maintenance are easy.

[0029] 3. The power switching box is arranged in the transformer substation, the amount of reconstruction construction is small, the environment is good, and the point inspection and maintenance are easy.

[0030] 4. The bus-tie control circuit is provided with the time delay relay KT, the interlocking signal action time can be adjusted, the false signal is filtered out, and the interlocking protection is safe and reliable.

[0031] 5. The bus-tie control circuit is adopted, if the I section low-voltage bus or the II section low-voltage bus power supply fails, the II section low-voltage bus or the I section low-voltage bus power supply can be automatically switched quickly, the on-site manual switching of the working power supply by the attendant is not needed, the structure is simple, and the power switching box is easy to popularize. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is the structure diagram of the power switching device of the single bus section electrical main wiring.

[0033] Figure 2 is the main circuit principle diagram of the power switching device of the single bus section electrical main wiring.

[0034] Figure 3 is the control circuit principle diagram of the power switching device of the single bus section electrical main wiring.

[0035] Figure 4 is the control circuit principle diagram of the low voltage bus section I.

[0036] Figure 5 is the bus tie control circuit principle diagram.

[0037] Figure 6 is the control circuit principle diagram of the low voltage bus section II.

[0038] Figure 7 is the PLC principle diagram of the power switching device of the single bus section electrical main wiring.

[0039] Figure 8 is the box surface layout diagram of the power switching box. DETAILED DESCRIPTION

[0040] The utility model will be described in detail below in combination with the drawings of the specification, but it should be pointed out that the implementation of the utility model is not limited to the following embodiments.

[0041] The following examples are implemented on the premise of the technical scheme of the utility model, and detailed implementation modes and specific operation processes are given, but the protection scope of the utility model is not limited to the following examples. The methods used in the following examples are all conventional methods unless otherwise specified.

[0042] Example 1

[0043] See Figure 1 , Figure 2A single bus section electric main wiring power switching device, comprising circuit breaker QS1, circuit breaker QS2, bus tie circuit breaker QS3, power switching box, circuit breaker QS1, circuit breaker QS2, bus tie circuit breaker QS3 all adopt universal circuit breaker, universal circuit breaker includes energy storage motor, micro switch S, opening coil, closing coil, micro switch S is connected with energy storage motor;The output end of circuit breaker QS1 is connected with the input end of bus tie circuit breaker QS3, the output end of circuit breaker QS2 is connected with the output end of bus tie circuit breaker QS3, the input end of bus tie circuit breaker QS3 is connected with section I low voltage bus, the output end of bus tie circuit breaker QS3 is connected with section II low voltage bus;The input end of circuit breaker QS1 is connected with incoming line power one, the input end of circuit breaker QS2 is connected with incoming line power two, incoming line power one and incoming line power two are respectively provided with voltmeter PV1, PV2, see Figure 2 , respectively used for measuring the voltage of incoming line power one, incoming line power 2;Incoming line power one is connected with the output end of transformer one, incoming line power two is connected with the output end of transformer two, the voltage of incoming line power one and incoming line power two is same;Transformer one and transformer two operate in parallel, respectively used for supplying power to section I low voltage bus and section II low voltage bus;The power supply capacity of incoming line power one and incoming line power two is mutual backup, and all low voltage loads (low voltage load group 1 & low voltage load group 2) can be maintained.

[0044] The power switching box comprises section I low voltage bus control loop, section II low voltage bus control loop, bus tie control loop, see Figure 3 , section I low voltage bus control loop is connected with the output end of circuit breaker QS1, section II low voltage bus control loop is connected with the output end of circuit breaker QS2, bus tie control loop is connected with the output end of bus tie circuit breaker QS3.

[0045] See Figure 4 , section I low voltage bus control loop comprises opening and closing branch circuit I and closing interlock branch circuit I, opening and closing branch circuit I and closing interlock branch circuit I are connected in parallel;Opening and closing branch circuit I comprises opening branch circuit I and closing branch circuit I, closing branch circuit I is connected in series with the normally open contact of bus selection switch SWC1, closing branch circuit I is connected in parallel with opening branch circuit I;Closing interlock branch circuit I comprises the coil of relay KA1, the normally open auxiliary contact one of bus tie circuit breaker QS3 and the normally open auxiliary contact two of circuit breaker QS2 connected in series;Closing branch circuit I comprises the closing coil of circuit breaker QS1, the normally closed auxiliary contact one of circuit breaker QS1, the normally closed contact of relay KA1 and closing button SC1 connected in series;Opening branch circuit I comprises the opening coil of circuit breaker QS1, the normally open auxiliary contact one of circuit breaker QS1 and opening button SO1 connected in series.

[0046] See Figure 6, the second section low-voltage bus control loop includes a branch circuit II and a closing interlock branch circuit II, the branch circuit II and the closing interlock branch circuit II are connected in parallel; the branch circuit II includes a branch circuit II and a closing circuit II, the closing circuit II is connected in series with a normally open contact of a bus selector switch SWC2, the closing circuit II is connected in parallel with the branch circuit II; the closing interlock branch circuit II includes a coil of a relay KA2, a normally open auxiliary contact two of a bus tie switch QS3 and a normally open auxiliary contact two of a circuit breaker QS1 connected in series; the closing circuit I includes a closing coil of the circuit breaker QS2, a normally closed auxiliary contact one of the circuit breaker QS2, a normally closed contact of the relay KA2 and a closing button SC2 connected in series; the branch circuit I includes a branch coil of the circuit breaker QS2, a normally open auxiliary contact one of the circuit breaker QS2 and a branch button SO2 connected in series.

[0047] See Figure 5 , the bus tie control loop includes a branch circuit III, a closing interlock branch circuit IIIa and a closing interlock branch circuit IIIb, the branch circuit III and the closing interlock branch circuit IIIb are connected in parallel, the closing interlock branch circuit IIIa is connected with the branch circuit III; the branch circuit III includes a branch circuit III, a closing circuit III and a linkage branch circuit, the closing circuit III is connected in series with a normally open contact one of a bus selector switch SWC3, the linkage branch circuit includes a normally open contact two of the bus selector switch SWC3 and a normally open contact of a time delay relay KT connected in series; the closing interlock branch circuit IIIa includes a normally closed auxiliary contact two of the circuit breaker QS1 and a coil of the time delay relay KT connected in series, the normally closed auxiliary contact two of the circuit breaker QS1 is connected in parallel with a normally closed auxiliary contact two of the circuit breaker QS2, the other end of the normally closed auxiliary contact two of the circuit breaker QS1 is connected with the normally open contact two of the bus selector switch SWC3; the closing interlock branch circuit IIIb includes a coil of a relay KA3, a normally open auxiliary contact three of the circuit breaker QS1 and a normally open auxiliary contact three of the circuit breaker QS2 connected in series; the closing circuit III includes a closing coil of the circuit breaker QS3, a normally closed auxiliary contact of the circuit breaker QS3, a normally closed contact of the relay KA3 and a closing button SC3 connected in series; the connection point of the normally closed contact of the KA3 and the closing button SC3 is connected with the other end of the normally open contact of the time delay relay KT; the branch circuit III includes a branch coil of the circuit breaker QS3, a normally open auxiliary contact four of the circuit breaker QS3 and a branch button SO3 connected in series.

[0048] See Figure 7 , a normally open auxiliary contact five of the circuit breaker QS1, a normally open auxiliary contact five of the circuit breaker QS2 and a normally open auxiliary contact five of the bus tie circuit breaker QS3 and a normally open contact three of the SWC3 are respectively connected with digital quantity input ports of a PLC.

[0049] See Figure 8The power switching box is installed in the power transformation station, can be arranged adjacent to the side plate of the electrical control cabinet, can be hung on the wall, the installation height is +1.5 m, the box face adopts a stainless steel panel, a carbon steel plastic spraying side back plate, IP43, and the lower part is in and out of the line; the box door panel is provided The caliber conversion switch, the red and green signal lamp, the red and green button, the 0-450V pointer type voltmeter PV1, PV2, the pointer type voltmeter PV1, PV2 are installed on the upper part of the box door; the bus selection switch SWC1, SWC2 adopts a three-position conversion switch, is respectively installed in the middle part of the box door, and is respectively used for switching the incoming power one and the incoming power two; the closing button SC1 and the opening button SO1 of the I section bus control circuit, the closing button SC2 and the opening button SO2 of the II section bus control circuit, the closing button SC3 and the opening button SO3 of the bus connection control circuit are installed on the lower part of the box door, and the circuit breaker one QS1, the circuit breaker two QS2 and the bus connection circuit breaker QS3 are opened and closed; the corresponding operation indicating lamp is divided into two colors of red and green, and is shown in Figures 4-6 A two-position self-locking type conversion switch is used for manual\linkage switching SWC3 and is installed between the bus selection switches SWC1 and SWC2.

[0050] Working principle

[0051] When the manual mode is selected, the buttons and the indicating lamp on the lower part of the box door are effective; when the linkage mode is selected, the button operation is invalid, and the indicating lamp state is still effective; in the linkage mode, the incoming circuit breaker one QS1 and the circuit breaker two QS2 are closed, and respectively supply power to the I section bus and the II section bus; when one power supply trips, the bus connection circuit breaker QS3 interlocking time relay KT acts, excites the bus connection closing coil to act, and the bus connection circuit breaker QS3 is closed, so that the incoming power one and the incoming power two are switched; after switching, the circuit breaker signal is monitored in the PLC system, an alarm is sent, and the operator is prompted to handle the fault power supply; after the handling is completed, the two power supplies are normal, the operator manually resets the operation box, and the state before switching is restored, that is, the switching function of the power switching box is“automatic switching, not automatic resetting”, so that the secondary circuit logic can be reduced, and the stable function is ensured; the external cable of the power switching box adopts the HARTING quick-change plug, the pin definition and the cable length are uniform, and the construction and spare parts are convenient.

[0052] The utility model discloses power switching box sets in the transformation construction quantity little, the environment is good, is easy to point and examine maintenance in the transformation power supply station, is equipped with bus selection switch SWC1 -SWC3 on the power switching box, when overhauling or cooperating superior operation, convenient operating personnel can select I section low voltage bus control loop, II section low voltage bus control loop, bus tie control loop through the operation bus selection switch SWC1 -SWC3, simple structure, convenient operation, is equipped with closing button, opening button on the power switching box, when overhauling or cooperating superior operation, convenient operating personnel can start or stop I section low voltage bus control loop or II section low voltage bus control loop or bus tie control loop, simple structure, convenient operation, and bus tie control loop is equipped with delay relay KT, can adjust interlock signal action time, filters out false signal, and interlock protection is safe and reliable, adopts bus tie control loop, if can realize I section low voltage bus or II section low voltage bus power supply appears the failure under voltage, fast automatic switching II section low voltage bus or I section low voltage bus power supply, need not the on -duty personnel to reach the scene manual switching work power supply, simple structure, easy to promote.

Claims

1. A single bus sectionalized electrical main power switching device, characterized by, The input end of the circuit breaker one is connected with the incoming power one, the input end of the circuit breaker two is connected with the incoming power two, the output end of the incoming power one is connected with the transformer one, the output end of the incoming power two is connected with the transformer two, and the voltage of the incoming power one and the incoming power two is same. The power switching box comprises a busbar control circuit I, a busbar control circuit II and a bus-tie control circuit, the busbar control circuit I is connected with the output end of the circuit breaker one, the busbar control circuit II is connected with the output end of the circuit breaker two, and the bus-tie control circuit is connected with the output end of the bus-tie circuit breaker.

2. A single bus sectionalized electrical main power switching device according to claim 1, wherein, The busbar control circuit I comprises a closing and opening branch I and a closing interlock branch I, and the closing and opening branch I is connected with the closing interlock branch I in parallel.

3. A single bus sectionalized electrical main power switching apparatus as set forth in claim 2, wherein, The busbar control circuit II comprises a closing and opening branch II and a closing interlock branch II, and the closing and opening branch II is connected with the closing interlock branch II in parallel. The bus-tie control circuit comprises a closing and opening branch III, a closing interlock branch IIIa and a closing interlock branch IIIb, the closing and opening branch III is connected with the closing interlock branch IIIb in parallel, and the closing interlock branch IIIa is connected with the closing and opening branch III. The closing and opening branch I comprises a closing branch I and an opening branch I, the closing branch I is connected with the normally open contact of the busbar selection switch SWC1 in series, and the closing branch I is connected with the opening branch I in parallel.

4. A single bus sectionalized electrical main power switching apparatus as set forth in claim 3, wherein, The closing and opening branch II comprises a closing branch II and an opening branch II, the closing branch II is connected with the normally open contact of the busbar selection switch SWC2 in series, and the closing branch II is connected with the opening branch II in parallel. The closing interlock branch II comprises the coil of the relay KA2, the normally open auxiliary contact two of the bus-tie circuit breaker and the normally open auxiliary contact two of the circuit breaker one connected in series. The closing branch I comprises the closing coil of the circuit breaker one, the normally closed auxiliary contact one of the circuit breaker one, the normally closed contact of the relay KA1 and the closing button SC1 connected in series.

5. A single bus sectionalized electrical main power switching apparatus as set forth in claim 3, wherein, The opening branch I comprises the opening coil of the circuit breaker one, the normally open auxiliary contact one of the circuit breaker one and the opening button SO1 connected in series. The closing and opening branch II comprises a closing branch II and an opening branch II, the closing branch II is connected with the normally open contact of the busbar selection switch SWC2 in series, and the closing branch II is connected with the opening branch II in parallel. The closing interlock branch II comprises the coil of the relay KA2, the normally open auxiliary contact two of the bus-tie circuit breaker and the normally open auxiliary contact two of the circuit breaker one connected in series. The closing branch I comprises the closing coil of the circuit breaker two, the normally closed auxiliary contact one of the circuit breaker two, the normally closed contact of the relay KA2 and the closing button SC2 connected in series. The opening branch I comprises the opening coil of the circuit breaker two, the normally open auxiliary contact one of the circuit breaker two and the opening button SO2 connected in series.

6. A single bus sectionalized electrical main power switching apparatus as set forth in claim 3, wherein, The opening and closing branch III includes an opening branch III, a closing branch III, a linkage branch, the closing branch III is connected in series with the normally open contact two of the bus selector switch SWC3, the linkage branch includes the normally open contact two of the bus selector switch SWC3 and the normally open contact of the time delay relay KT connected in series; The closing interlock branch IIIa includes the coil of the time delay relay KT and the normally closed auxiliary contact two of the circuit breaker one connected in series, the normally closed auxiliary contact two of the circuit breaker one is connected in parallel with the normally closed auxiliary contact two of the circuit breaker two, the other end of the normally closed auxiliary contact two of the circuit breaker one is connected with the normally open contact two of the bus selector switch SWC3; The closing interlock branch IIIb includes the coil of the relay KA3, the normally open auxiliary contact three of the circuit breaker one and the normally open auxiliary contact three of the circuit breaker two connected in series; The closing branch III includes the closing coil of the circuit breaker three, the normally closed auxiliary contact of the circuit breaker three, the normally closed contact of the relay KA3 and the closing button SC3 connected in series, the connection point of the normally closed contact of KA3 and the closing button SC3 is connected with the other end of the normally open contact of the time delay relay KT; The opening branch III includes the opening coil of the circuit breaker three, the normally open auxiliary contact four of the circuit breaker three and the opening button SO3 connected in series.

7. A single bus sectionalized electrical main power switching apparatus as set forth in claim 1, wherein, The I section bus is used for being connected with the AC load one, and the II section bus is used for being connected with the AC load two.

8. A single bus sectionalized electrical main power switching apparatus as set forth in claim 1, wherein, The transformer one and the transformer two are arranged in the transformer substation.

9. A single bus sectionalized electrical main power switching apparatus as set forth in claim 1, wherein, The circuit breaker one, the circuit breaker two and the bus tie circuit breaker are all universal circuit breakers, the universal circuit breaker includes an energy storage motor, a micro switch S, an opening coil and a closing coil, the micro switch S is connected with the energy storage motor.

10. A single bus sectionalized electrical main power switching apparatus as set forth in claim 1, wherein, The power switching box is arranged in the power distribution substation.

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