CN215990298U

CN215990298U - Quick switching device of station service power

Info

Publication number: CN215990298U
Application number: CN202121336849.8U
Authority: CN
Inventors: 刘飚; 张玉良; 王文钢; 谭相忠; 王咸胜; 章传刚; 陈思航; 王宇; 方志东
Original assignee: Huaneng Yichun Thermoelectricity Co ltd
Current assignee: Huaneng Yichun Thermoelectricity Co ltd
Priority date: 2021-06-16
Filing date: 2021-06-16
Publication date: 2022-03-08
Anticipated expiration: 2031-06-16

Abstract

The utility model discloses a device for rapidly switching station service power, which comprises: the fast switch comprises a wire inlet loop and a fast switch loop, wherein the wire inlet loop is connected with the fast switch loop, a working position judging device is arranged on the fast switch loop and is connected with the fast switch loop in series, the on-off of the working judging device controls the on-off of the fast switch device, a working position auxiliary judging device is arranged on the wire inlet loop and is connected with the wire inlet loop in series, and the working position auxiliary judging device is connected with the fast switch loop in series.

Description

Quick switching device of station service power

Technical Field

The utility model relates to the technical field of thermal power, in particular to a rapid switching device for service power.

Background

The factory power system of thermal power factory generally all has two powers, the factory is with working power supply and stand-by power supply promptly, and most thermal power factory all adopts the unit wiring at present, and unit factory is used of power by unit during normal operating, and the shutdown state is supplied power by stand-by power supply, and the unit must carry on the factory with the load and switch over in the start-up and shut-down process, carries out the divide-shut brake operation of working mains switch, stand-by power switch through fast switching device promptly and realizes switching between the equipment. The service power switching usually adopts the parallel switching mode, namely when the fast switching condition is satisfied, closes the stand-by power supply inlet wire switch earlier, confirms that stand-by power supply inlet wire switch is surely closing the position after, jumps out the working power supply inlet wire switch through certain time delay. The position of the switch in the switch bin can be controlled by pulling the handcart rocker through the drawer switch, the working position means that the switch is in a completely pushed state, at the moment, the switch contact and the bus are completely connected, and power can be supplied as long as the switch is switched on. The switch test means that the switch is in a half-push state, namely the switch contact is not connected with the bus, the opening and closing operation of the switch is not influenced at the moment, but the purpose of power transmission cannot be achieved even if the switch is closed because the switch contact is not connected with the bus.

At present, intelligent auxiliary power quick switching device is widely adopted in thermal power plants, and switching device locking criterion includes: the working switch and the standby switch are switched on and off; bus isolation switch position; an external protection lockout signal; working voltage, standby voltage, bus voltage amplitude, frequency, angular difference. And the operating personnel is allowed to execute the quick switching operation after the signals are all satisfied. When the device judges that no locking signal exists, the operator sends a switching instruction remotely, and switching operation of firstly closing the standby switch and then separating the working switches is executed, so that service power is switched from working to standby without interference.

The working and standby incoming line switches usually have two states of working positions and test positions. When the switch is at a test position, although the switch can be switched on, the primary loop is not really switched on because the movable contact and the fixed contact of the switch are separated. If the operator wrongly executes remote switching operation under the condition of the switch test position, the quick switching device executes switching because the switch position cannot be distinguished, and at the moment, the bus is powered off to cause accidents. Therefore, the original locking condition can not completely meet the switching requirements of safety and reliability, and locking criteria need to be added.

The existing fast switching device can meet the switching conditions and comprises the following components: the working incoming line switch (standby incoming line switch) is in a closed position, the standby incoming line switch (working incoming line switch) is in a separated position, the voltage difference between the standby incoming line voltage and the bus voltage is within ten percent of the rated voltage, the frequency difference is within 0.2 Hz, and the difference is within 15 degrees, the bus disconnecting link is in a closed position, an operator sends a switching instruction after the conditions are met, and the device executes switching operation to complete switching from working to standby or from standby to a working power supply.

Although the locking criterion of the quick-switching device is comprehensive, the judgment basis for the position of the 6 kilovolt switch is lacked. The test position and the working position of the switch can not be accurately distinguished, and the service power loss in the switching process is easily caused by the mismatching of the switch at the test position. Taking the unit maintenance as an example, during the maintenance, in order to prevent the switch from closing by mistake and causing the transformer to reverse charge, the branch inlet wire of the low-voltage side of the high-voltage plant, namely the inlet wire switch of the 6 KV working power supply, is usually pulled to the maintenance position or the test position. If the operating personnel do not check the switch position before executing the switching operation of the service power, namely, the 6 KV incoming line switch is under the condition of a test position, the operating personnel execute the switching operation of the service power, the quick switching device cannot judge the switch position, the switching instruction is executed wrongly, although the switch can be switched on, the movable and static contacts of the switch are separated under the test position state, a primary loop is not really switched on, and the service power is lost.

SUMMERY OF THE UTILITY MODEL

In some embodiments of this application, a quick auto-change over device of station service is provided, through setting up the supplementary decision device of position of work decision device and position of work, has solved present fast device of cutting and can't judge the problem whether the switch is at the operating position, prevents that the switch from carrying out fast operation of cutting by mistake when experimental position, causes the station service to lose.

In some embodiments of the present application, a fast switching device for service power is provided, including: inlet wire return circuit and fast circuit of cutting, the inlet wire return circuit connect in fast circuit of cutting, be provided with the work position decision maker on the fast circuit of cutting, work position decision maker series connection be in fast circuit of cutting is last, by work decision maker's on-off control fast switch over device's switching on/off, be provided with the supplementary decision maker of work position on the inlet wire return circuit, the supplementary decision maker of work position is established ties on the inlet wire return circuit, just the supplementary decision maker series connection of work position in fast circuit of cutting.

In some embodiments of the present application, the incoming line loop comprises: work inlet wire return circuit and reserve inlet wire return circuit, work inlet wire return circuit with reserve inlet wire return circuit parallel connection, just work inlet wire return circuit with reserve inlet wire return circuit all series connection in cut the return circuit soon.

In some embodiments of the present application, the work position determination device includes: first work position contact site and second work position contact site, first work position contact site with second work position contact site parallel connection, just first work position contact site series connection is in the public end in work inlet wire return circuit, second work position contact site series connection is in the public end in reserve inlet wire return circuit.

In some embodiments of the present application, the work position auxiliary determining device includes: the first current relay is connected in series with the first working position contact part, and the second current relay is connected in series with the second working position contact part.

In some embodiments of the present application, the work position auxiliary determining device includes: the first current transformer is connected to the wire inlet end of the first current relay in series so as to control the on-off of the first current relay; the second current transformer is connected in series with the wire inlet end of the second current relay to control the on-off of the second current relay.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a simplified schematic connection diagram of a service quick switching apparatus in accordance with some embodiments of the present invention;

FIG. 2 is a simplified schematic illustration of the connection of a fast-switching loop in some embodiments of the utility model;

FIG. 3 is a schematic diagram of the connection of an incoming line loop in some embodiments of the utility model;

reference numerals:

100. a fast switching loop; 110. a work position determination device; 111. a first work station contact; 112. a second work position contact part; 200. an incoming line loop; 210. a work position auxiliary judgment device; 211. a first current relay; 212. a second current relay; 213. a first current transformer; 214. a second current transformer; 22. a working incoming line loop; 230. a standby incoming line loop.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.

In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

As shown in fig. 1, a service quick switching device according to some embodiments of the present application includes: an incoming line loop 200 and a fast switching loop 100.

Incoming line loop 200 is connected to fast switching loop 100.

As shown in fig. 1 and 3, an incoming line loop 200 according to some embodiments of the present application includes: a working incoming line loop 220 and a standby incoming line loop 230.

The working incoming line loop 220 and the standby incoming line loop 230 are connected in parallel, and both the working incoming line loop 220 and the standby incoming line loop 230 are connected in series to the fast switching loop 100.

As shown in fig. 3, an incoming line loop 200 according to some embodiments of the present application includes: the work position auxiliary decision device 210.

The auxiliary working position determining device 210 is connected in series to the incoming line loop 200, and the auxiliary working position determining device 210 is connected in series to the fast switching loop 100.

As shown in fig. 3, the working bit auxiliary decision device 210 according to some embodiments of the present application includes: a first current relay 211 and a second current relay 212.

The first current relay 211 is connected in series to the first operating position contact 111, and the second current relay 212 is connected in series to the second operating position contact 112.

As shown in fig. 3, the working bit auxiliary decision device 210 according to some embodiments of the present application includes: a first current transformer 213 and a second current transformer 214.

The first current transformer 213 is used for controlling the on-off of the first current relay 211, and the second current transformer 214 is used for controlling the on-off of the second current relay 212.

The first current transformer 213 is connected in series to the line inlet of the first current relay 211, and the second current transformer 214 is connected in series to the line inlet of the second current relay 212.

It should be noted that, in the present application, a current relay and a current transformer are added to the incoming line loop 200, the action constant value of the current relay is set to be 0.1 times of the rated current of the bus, and the action contacts of the current relay and the current transformer and the closing feedback contact of the switch are connected in series into the incoming line loop 200, which is used to determine whether the switch to be closed is actually connected to the fast switching loop 100, and only when the switch is connected to the fast switching loop 100, the current can flow after the switch is closed.

As shown in fig. 2, a fast switching loop 100 in some embodiments according to the present application includes: a work position determination device 110.

The on/off of the work position determining device 110 controls the on/off of the fast switching device.

The station determining device 110 is connected in series to the fast-switching loop 100.

As shown in fig. 2, the working bit determining apparatus 110 according to some embodiments of the present application includes: a first operating position contact 111 and a second operating position contact 112.

The first working position contact portion 111 and the second working position contact portion 112 are connected in parallel, and the first working position contact portion 111 is connected in series to the common end of the working incoming line loop 220, and the second working position contact portion 112 is connected in series to the common end of the standby incoming line loop 230.

As shown in fig. 1-3, according to the working principle of a service power fast switching device in some embodiments of the present application: the working position judging device 110 is arranged on the incoming line loop 200 and the fast switching loop 100, and the loops can be switched on only when the switch is in the working position; when the switch is at another position, even if the operating position determining device 110 issues a closing command, the circuit will not form a path because the operating position auxiliary determining device 210 is not turned on, and the switch cannot be closed.

In summary, the present invention discloses a device for rapidly switching service power, including: the fast switch comprises a wire inlet loop and a fast switch loop, wherein the wire inlet loop is connected with the fast switch loop, a working position judging device is arranged on the fast switch loop and is connected with the fast switch loop in series, the on-off of the working judging device controls the on-off of the fast switch device, a working position auxiliary judging device is arranged on the wire inlet loop and is connected with the wire inlet loop in series, and the working position auxiliary judging device is connected with the fast switch loop in series.

Those of ordinary skill in the art will understand that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the utility model as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A service power fast switching apparatus, comprising: the fast cutting device comprises a wire inlet loop and a fast cutting loop, wherein the wire inlet loop is connected to the fast cutting loop;

the fast switching device is characterized in that a working position judging device is arranged on the fast switching loop, the working position judging device is connected in series on the fast switching loop, the on-off of the working position judging device controls the on-off of the fast switching device, a working position auxiliary judging device is arranged on the incoming line loop, the working position auxiliary judging device is connected in series on the incoming line loop, and the working position auxiliary judging device is connected in series on the fast switching loop.

2. The service quick switching device of claim 1, wherein said incoming line loop comprises: work inlet wire return circuit and reserve inlet wire return circuit, work inlet wire return circuit with reserve inlet wire return circuit parallel connection, just work inlet wire return circuit with reserve inlet wire return circuit all series connection in cut the return circuit soon.

3. The fast switching apparatus for service power as claimed in claim 2, wherein the work level determining means comprises: first work position contact site and second work position contact site, first work position contact site with second work position contact site parallel connection, just first work position contact site series connection is in the public end in work inlet wire return circuit, second work position contact site series connection is in the public end in reserve inlet wire return circuit.

4. The fast switching apparatus for auxiliary power supply according to claim 3, wherein said auxiliary work level determining means comprises: the first current relay is connected in series with the first working position contact part, and the second current relay is connected in series with the second working position contact part.

5. The fast switching apparatus for auxiliary power supply according to claim 4, wherein said auxiliary work level determining means comprises: the first current transformer is connected to the wire inlet end of the first current relay in series so as to control the on-off of the first current relay; the second current transformer is connected in series with the wire inlet end of the second current relay to control the on-off of the second current relay.