CN215300162U - Low-voltage transformer area load uninterrupted switching system - Google Patents
Low-voltage transformer area load uninterrupted switching system Download PDFInfo
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- CN215300162U CN215300162U CN202121651000.XU CN202121651000U CN215300162U CN 215300162 U CN215300162 U CN 215300162U CN 202121651000 U CN202121651000 U CN 202121651000U CN 215300162 U CN215300162 U CN 215300162U
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Abstract
The utility model discloses a low pressure platform district load switched systems that does not have a power failure relates to the electric power fortune and examines the power supply technical field of guarantor. At present, power failure switching is needed during power grid maintenance. The utility model comprises a main conductive branch, a short-time conductive branch, a commercial power bypass, a control circuit and a current/voltage signal acquisition module; the main conductive branch comprises a second circuit breaker Q2; one end of a second breaker Q2 is connected with the mobile box transformer/power supply vehicle S1, and the other end of the second breaker Q2 is connected with the outlet end of the low-voltage distribution box JP 1; the short-time conducting branch comprises an electronic solid-state switch D1; the short-time conducting branch is connected with a second breaker Q2 in parallel; the mains bypass comprises a first circuit breaker Q1; one end of the first breaker Q1 is connected with a low-voltage distribution box JP1 wire outlet end, and the other end of the first breaker Q1 is connected with a low-voltage distribution box JP1 wire inlet end; in the technical scheme, the solid-state electronic solid-state switch D1 undertakes a transient process, and solves the short-time power failure phenomenon caused by the breaking of a mechanical contact, so that the uninterrupted switching of the load between a power grid and a standby power supply is realized.
Description
Technical Field
The utility model relates to an electric power fortune is examined and is protected power supply technical field, especially relates to a low pressure platform district load switched systems that does not have a power failure.
Background
For operations such as user access, defect handling, equipment scheduled inspection, maintenance, accident handling, higher-level power grid maintenance and the like, the low-voltage distribution network often uses a method of first power cut and then power down, so that the power cut times are more, the time is longer, the normal production of enterprises is seriously influenced, and much inconvenience is brought to the life of people. The power supply enterprise reduces the electricity selling amount due to power failure, so economic loss is caused, complaint responsibility caused by frequent power failure of users in the jurisdiction is born, the social image of the power supply enterprise is damaged, and the social influence caused by power failure is highly valued by the power supply enterprise.
At present, a scheme for realizing the back-off between commercial power and a generator is applied in a 0.4kV low-voltage system by synchronization detection and switching after grid connection, but the defects are described as follows: firstly, the scheme requires the grid-connected operation of the generator and the power grid, has large impact on the generator and the power grid, can affect the stability of the system, and even has the risk and fault of grid-connected failure. Secondly, in order to simplify the grid-connected operation steps, the bypass power supply operation needs to be performed on the grid side, the live-line operation needs to be performed on the grid side outlet end, the live-line operation needs to be performed on the grid side inlet end, and the live-line operation steps and the safety risks are increased. In addition, the standby power supply modes in various places are also obviously different, for example, the standby power supply adopts a mobile box transformer, and at this time, because the wiring modes of the transformer are different and the two power supplies are different between full load and no load, the two power supplies on the low-voltage side have the same frequency but have a larger angle difference, and at this time, the grid connection requirement cannot be met, the load switching cannot be realized by synchronous grid connection, and therefore, the use requirements of all users cannot be met.
In order to solve the problem that the existing quasi-synchronization grid connection is safe and is not limited from the technical innovation point, the steps of live working are further simplified, the application scene of uninterrupted working is increased, and the reliability and the safety of uninterrupted switching are improved, a novel uninterrupted switching scheme is urgently needed, so that uninterrupted smooth transition of loads is realized.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that solve and the technical task that provides are perfect and improve prior art scheme, provide a low pressure platform district load switching system that does not have a power failure to realize the switching that does not have a power failure of load between electric wire netting and stand-by power supply, reach the electrified purpose of inserting simple, the slew velocity is fast of net side. Therefore, the utility model adopts the following technical scheme.
A low-voltage transformer area load uninterrupted switching system comprises a main power conducting branch, a short-time power conducting branch, a mains supply bypass, a control circuit and a current/voltage signal acquisition module;
the main conductive branch comprises a second circuit breaker Q2; one end of a second breaker Q2 is connected with a mobile box transformer/power supply vehicle S1; the other end of the second breaker Q2 is connected with a low-voltage distribution box JP1 outlet end;
the short-time conducting branch comprises an electronic solid-state switch D1; the short-time conducting branch is connected with a second breaker Q2 in parallel;
the mains supply bypass comprises a first circuit breaker Q1; one end of a first breaker Q1 is connected with a low-voltage distribution box JP1 outlet end; the other end of the first breaker Q1 is connected with the inlet wire end of a low-voltage distribution box JP 1;
the control circuit comprises a main control unit MC1, wherein the main control unit MC1 is connected with a current/voltage signal acquisition module to acquire voltage and current information; the main control unit MC1 controls the on-off of the main conductive branch circuit through a second circuit breaker Q2; the master control unit MC1 controls the on-off of the short-time conducting branch through the electronic solid-state switch D1; the main control unit MC1 controls the on/off of the main conducting branch through the first breaker Q1.
In the switching process, the solid-state electronic solid-state switch D1 undertakes a transient process, and solves the short-time power failure phenomenon caused by the breaking of a mechanical contact, so that the uninterrupted switching of the load between a power grid and a standby power supply is realized, and the device has the remarkable advantages of simple electrified access of the grid side, high switching speed, high synchronization performance, low static loss, good comprehensive performance and the like.
The electronic solid-state switch D1 is driven to be instantly conducted, so that the short-time power failure phenomenon caused by the action delay of the mechanical contact is compensated, and the uninterrupted switching control of the load is realized.
The first and second circuit breakers Q1 and Q2 not only complete the switching on/off and power switching on operation of the main power supply, but also have the overload short-circuit protection function.
As a preferable technical means: the short-time conducting branch circuit also comprises a third breaker Q3, and the third breaker Q3 is connected with an electronic solid-state switch D1 in series. The third circuit breaker Q3 is mainly used for overload and short-circuit protection caused by the failure of the electronic solid-state switch D1, and the fault accident is prevented from being expanded.
As a preferable technical means: the current/voltage signal acquisition module comprises a first current sensor CT1 for acquiring the current information of a mains supply bypass, a second current sensor CT2 for acquiring the current information of a main conducting branch, a first voltage sensor PT1 for acquiring the voltage information of a mains supply, a second voltage sensor PT2 for acquiring the voltage information of a mobile power supply vehicle S1 and a third voltage sensor PT3 for acquiring the voltage information of a wire outlet end; the first current sensor CT1, the second current sensor CT2, the first voltage sensor PT1, the second voltage sensor PT2 and the third voltage sensor PT3 are connected with the main control unit MC 1.
As a preferable technical means: the three sensors are respectively provided with three A \ B \ C three phases, wherein the three phases are respectively corresponding to the first current sensor CT1, the second current sensor CT2, the first voltage sensor PT1, the second voltage sensor PT2 and the third voltage sensor PT 3.
As a preferable technical means: the first current sensor CT1 is arranged on a commercial power bypass, and the first current sensor CT1 is positioned between the first breaker Q1 and the outlet end of the press-fit box JP 1;
the second current sensor CT2 is arranged on the main conductive branch, and the second current sensor CT2 is positioned between the second circuit breaker Q2 and the outlet end of the press-fit box JP 1;
the first voltage sensor PT1 is arranged on a mains supply bypass, and the first voltage sensor PT1 is positioned between the first breaker Q1 and the inlet wire end of the press-fit box JP 1;
the second voltage sensor PT2 is arranged on the main conductive branch, and the second voltage sensor PT2 is positioned between the second circuit breaker Q2 and the mobile power supply vehicle S1;
the third voltage sensor PT3 is arranged on the main conducting branch or the commercial power bypass, the third voltage sensor PT3 is positioned between the second circuit breaker Q2 and the outlet end of the low-voltage distribution box JP1, or the third voltage sensor PT3 is positioned between the first circuit breaker Q1 and the outlet end of the low-voltage distribution box JP 1.
Has the advantages that:
the technical scheme solves the problem that safety exists in the existing quasi-synchronization grid connection, further simplifies the steps of live working, increases the application scenes of uninterrupted working, and improves the reliability and safety of uninterrupted switching.
In the switching process, the solid-state electronic solid-state switch D1 undertakes a transient process, and solves the short-time power failure phenomenon caused by the breaking of a mechanical contact, so that the uninterrupted switching of the load between a power grid and a standby power supply is realized, and the device has the remarkable advantages of simple electrified access of the grid side, high switching speed, high synchronization performance, low static loss, good comprehensive performance and the like.
Drawings
Fig. 1 is an electrical schematic diagram of the low-voltage load uninterrupted fast switching system.
Fig. 2 is a schematic diagram of short-time power supply of the utility power supply vehicle S1 by the Q3 and D1 at the moment of the commercial power outage.
Fig. 3 is a schematic diagram of the load power supply circuit after the second circuit breaker Q2 is closed.
Fig. 4 is a schematic diagram of the bypass power supply of the utility power through the first circuit breaker Q1.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings.
As shown in fig. 1, the utility model mainly comprises a main conductive branch, a short-time conductive branch, a mains supply bypass, a control circuit and a current/voltage signal acquisition module;
wherein: the main conductive branch comprises a second circuit breaker Q2; one end of a second breaker Q2 is connected with a mobile box transformer/power supply vehicle S1; the other end of the second breaker Q2 is connected with a low-voltage distribution box JP1 outlet end;
the short-time conducting branch comprises an electronic solid-state switch D1 and a first breaker Q1; the short-time conducting branch is connected with a second breaker Q2 in parallel;
the mains supply bypass comprises a first circuit breaker Q1; one end of a first breaker Q1 is connected with a low-voltage distribution box JP1 outlet end; the other end of the first breaker Q1 is used for being connected with a low-voltage distribution box JP1 incoming line end; initially, the inlet end of the first disconnector Q1 is temporarily disconnected from the inlet end of the external low-voltage switchgear JP1, as indicated by the dashed line segment in fig. 1;
the control circuit comprises a main control unit MC1, wherein the main control unit MC1 is connected with a current/voltage signal acquisition module to acquire voltage and current information; the main control unit MC1 controls the on-off of the main conductive branch circuit through a second circuit breaker Q2; the master control unit MC1 controls the on-off of the short-time conducting branch through the electronic solid-state switch D1; the main control unit MC1 controls the on-off of the main conducting branch through a first circuit breaker Q1;
the current/voltage signal acquisition module comprises a first current sensor CT1 for acquiring the current information of a mains supply bypass, a second current sensor CT2 for acquiring the current information of a main conducting branch, a first voltage sensor PT1 for acquiring the voltage information of a mains supply, a second voltage sensor PT2 for acquiring the voltage information of a mobile power supply vehicle S1 and a third voltage sensor PT3 for acquiring the voltage information of a wire outlet end; the first current sensor CT1, the second current sensor CT2, the first voltage sensor PT1, the second voltage sensor PT2 and the third voltage sensor PT3 are connected with the main control unit MC 1; the three first current sensors CT1, the three second current sensors CT2, the three first voltage sensors PT1, the three second voltage sensors PT2 and the three third voltage sensors PT3 are respectively provided with corresponding A \ B \ C three phases; the first current sensor CT1 is arranged on a commercial power bypass, and the first current sensor CT1 is positioned between the first breaker Q1 and the outlet end of the press-fit box JP 1;
the second current sensor CT2 is arranged on the main conductive branch, and the second current sensor CT2 is positioned between the second circuit breaker Q2 and the outlet end of the press-fit box JP 1;
the first voltage sensor PT1 is arranged on a mains supply bypass, and the first voltage sensor PT1 is positioned between the first breaker Q1 and the inlet wire end of the press-fit box JP 1;
the second voltage sensor PT2 is arranged on the main conductive branch, and the second voltage sensor PT2 is positioned between the second circuit breaker Q2 and the mobile power supply vehicle S1;
the third voltage sensor PT3 is arranged on the main conductive branch or the commercial power bypass, the third voltage sensor PT3 is positioned between the second circuit breaker Q2 and the outlet end of the low-voltage distribution box JP1, or the third voltage sensor PT3 is positioned between the first circuit breaker Q1 and the outlet end of the low-voltage distribution box JP1
As shown in fig. 1, the excitation control circuit 1 and the excitation control circuit 2 of the master control unit MC1 respectively control the switching coils Coil1 and Coil2 of the first circuit breaker Q1 and the second circuit breaker Q2, and the driving circuit of the electronic solid-state switch D1 is used for driving the conduction and the disconnection of the electronic solid-state switch D1; in addition, a first voltage sensor PT1 × 3, a second voltage sensor PT2 × 3 and a third voltage sensor PT3 × 3 on the main control unit MC1 are respectively used for measuring three-phase voltage, frequency and phase of the commercial power, the mobile power supply vehicle S1 and the load end; the first current sensor CT1 × 3 and the second current sensor CT2 × 3 measure a power supply current signal and the on/off state of the first breaker Q1 and the second breaker Q2 through the connection with the master control unit MC 1.
The working process is as follows:
and S1, when the load needs to be transferred to the mobile box transformer/power supply vehicle S1 from the mains supply side, the main control unit MC1 firstly monitors voltage signals through the second voltage sensor PT2 × 3 and the third voltage sensor PT3 × 3, judges whether the voltage values of the mobile box transformer/power supply vehicle S1 and the mains supply are within an error range and whether the phase sequence is consistent, and enters a phase of waiting for switching if the conditions are met.
S2, at the moment, a main switch of a manual brake-separating low-voltage distribution box JP1 is adopted, a main control unit MC1 instantly detects voltage drop of a voltage outlet end of the low-voltage distribution box JP1 through voltage sampling of a third voltage sensor PT3 x 3, at the moment, a loop is driven through an electronic solid-state switch D1 of a main control unit MC1 to drive the electronic solid-state switch D1 to be conducted, and a load supplies power to the load through a movable box transformer/power supply vehicle S1, a third circuit breaker Q3 and the electronic solid-state switch D1 to guarantee that the load supplies power uninterruptedly, as shown in FIG. 2.
S3, the master control unit MC1 drives the switching-closing Coil2 to act through the excitation control loop 2 at the same time, waiting for the second breaker Q2 to act and close, when the master control unit MC1 detects current flowing through the current sensor second current sensor CT2 x 3, the second breaker Q2 is successfully closed, the electronic solid-state switch D1 allows the master control unit MC1 to be disconnected, and the load supplies power to the load through the mobile box type transformer/power supply vehicle S1 and the second breaker Q2, so that the non-power-stop switching of the load from the mains supply to the mobile box type transformer/power supply vehicle S1 is completed, and as shown in FIG. 3, the high-voltage side is allowed to carry out power-cut maintenance operation.
And S4, after the high-voltage side of the low-voltage load uninterrupted switching system is powered off, allowing the incoming line side of the first breaker Q1 to pass through a cable and be connected with the incoming line end of the low-voltage distribution box under the uncharged condition.
S5, after the high-voltage side is overhauled, the main control unit MC1 monitors voltage signals through a first voltage sensor PT1 × 3 and a third voltage sensor PT3 × 3, judges whether the voltage values of the end of the low-voltage distribution box JP1 are in an error range and whether the phase sequence is consistent, if the conditions are met, the main control unit MC1 drives an electronic solid switch D1 to be conducted, and simultaneously drives a switching Coil2 and a second breaker Q2 to be opened, when the main control unit MC1 detects that the current is zero through a second current sensor CT2 × 3 of a current sensor, the second breaker Q2 is opened successfully, and at the moment, the load is powered by a mobile box transformer/power supply vehicle S1, the third breaker Q3 and the electronic solid switch D1 in a short time, as shown in FIG. 2.
S6, allowing the master control unit MC1 to drive the switching Coil1 through the excitation control loop 1 at the moment, waiting for the first breaker Q1 to operate and switch on, when the master control unit MC1 detects current flowing through the current sensor first current sensor CT1 x 3, indicating that the first breaker Q1 is successfully switched on, at the moment, switching off the electronic solid-state switch D1 through the master control unit MC1, and at the moment, supplying power to the load through the first breaker Q1 by-pass circuit at the moment, as shown in FIG. 4.
And S7, manually closing a low-voltage distribution box JP1 main incoming line switch, and finally driving and controlling a switching Coil1 and a first breaker Q1 through a main control unit MC1 to complete the operation of returning the load from a mobile box transformer/power supply vehicle S1 to the mains supply in a non-power-cut mode.
The non-stop switching system for low voltage distribution room loads shown in fig. 1-4 is a specific embodiment of the present invention, and embodies the substantial features and advantages of the present invention, and can modify the same in shape, structure, etc. according to the practical needs of use, all within the scope of protection of the present solution.
Claims (5)
1. The utility model provides a low pressure platform district load switched systems that does not have a power failure which characterized in that: the short-time power supply comprises a main conducting branch, a short-time conducting branch, a mains supply bypass, a control circuit and a current/voltage signal acquisition module;
the main conductive branch comprises a second circuit breaker Q2; one end of a second breaker Q2 is connected with a mobile box transformer/power supply vehicle S1; the other end of the second breaker Q2 is connected with a low-voltage distribution box JP1 outlet end;
the short-time conducting branch comprises an electronic solid-state switch D1; the short-time conducting branch is connected with a second breaker Q2 in parallel;
the mains supply bypass comprises a first circuit breaker Q1; one end of a first breaker Q1 is connected with a low-voltage distribution box JP1 outlet end; the other end of the first breaker Q1 is connected with the inlet wire end of a low-voltage distribution box JP 1;
the control circuit comprises a main control unit MC1, wherein the main control unit MC1 is connected with a current/voltage signal acquisition module to acquire voltage and current information; the main control unit MC1 controls the on-off of the main conductive branch circuit through a second circuit breaker Q2; the master control unit MC1 controls the on-off of the short-time conducting branch through the electronic solid-state switch D1; the main control unit MC1 controls the on/off of the main conducting branch through the first breaker Q1.
2. The uninterrupted switching system of low-voltage transformer area loads as claimed in claim 1, wherein: the short-time conducting branch circuit also comprises a third breaker Q3, and the third breaker Q3 is connected with an electronic solid-state switch D1 in series.
3. The uninterrupted switching system of low-voltage transformer area loads as claimed in claim 2, wherein: the current/voltage signal acquisition module comprises a first current sensor CT1 for acquiring the current information of a mains supply bypass, a second current sensor CT2 for acquiring the current information of a main conducting branch, a first voltage sensor PT1 for acquiring the voltage information of a mains supply, a second voltage sensor PT2 for acquiring the voltage information of a mobile power supply vehicle S1 and a third voltage sensor PT3 for acquiring the voltage information of a wire outlet end; the first current sensor CT1, the second current sensor CT2, the first voltage sensor PT1, the second voltage sensor PT2 and the third voltage sensor PT3 are connected with the main control unit MC 1.
4. The uninterrupted switching system of low-voltage transformer area loads as claimed in claim 3, wherein: the three sensors are respectively provided with three A \ B \ C three phases, wherein the three phases are respectively corresponding to the first current sensor CT1, the second current sensor CT2, the first voltage sensor PT1, the second voltage sensor PT2 and the third voltage sensor PT 3.
5. The uninterrupted switching system of low-voltage transformer area loads as claimed in claim 4, wherein:
the first current sensor CT1 is arranged on a commercial power bypass, and the first current sensor CT1 is positioned between the first breaker Q1 and the outlet end of the press-fit box JP 1;
the second current sensor CT2 is arranged on the main conductive branch, and the second current sensor CT2 is positioned between the second circuit breaker Q2 and the outlet end of the press-fit box JP 1;
the first voltage sensor PT1 is arranged on a mains supply bypass, and the first voltage sensor PT1 is positioned between the first breaker Q1 and the inlet wire end of the press-fit box JP 1;
the second voltage sensor PT2 is arranged on the main conductive branch, and the second voltage sensor PT2 is positioned between the second circuit breaker Q2 and the mobile power supply vehicle S1;
the third voltage sensor PT3 is arranged on the main conducting branch or the commercial power bypass, the third voltage sensor PT3 is positioned between the second circuit breaker Q2 and the outlet end of the low-voltage distribution box JP1, or the third voltage sensor PT3 is positioned between the first circuit breaker Q1 and the outlet end of the low-voltage distribution box JP 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121651000.XU CN215300162U (en) | 2021-07-20 | 2021-07-20 | Low-voltage transformer area load uninterrupted switching system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121651000.XU CN215300162U (en) | 2021-07-20 | 2021-07-20 | Low-voltage transformer area load uninterrupted switching system |
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| CN215300162U true CN215300162U (en) | 2021-12-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023000585A1 (en) * | 2021-07-20 | 2023-01-26 | 杭州电力设备制造有限公司 | Low-voltage transformer area load non-power-cut switching system and working method thereof |
| CN115967165A (en) * | 2023-01-18 | 2023-04-14 | 国网浙江省电力有限公司建德市供电公司 | Power-protection uninterrupted operation control device for generator and operation method thereof |
-
2021
- 2021-07-20 CN CN202121651000.XU patent/CN215300162U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023000585A1 (en) * | 2021-07-20 | 2023-01-26 | 杭州电力设备制造有限公司 | Low-voltage transformer area load non-power-cut switching system and working method thereof |
| CN115967165A (en) * | 2023-01-18 | 2023-04-14 | 国网浙江省电力有限公司建德市供电公司 | Power-protection uninterrupted operation control device for generator and operation method thereof |
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