Concise and effective variable-frequency drive redundancy of bridge crane of hydropower station

Abstract

The utility model discloses a simple and effective variable frequency drive redundancy for a bridge crane of a hydropower station, which is applied to the technical field of bridge cranes and comprises a common frequency converter US and a standby frequency converter UF which are electrically connected with a contactor K101 and a contactor K111 respectively. And one end, far away from the contactor K101, of the common frequency converter US is electrically connected with contactors K102, K103 and K104 respectively. A set of standby frequency conversion device is added on the basis of a set of frequency conversion device of a general hydropower station bridge crane driving system, and automatic or manual switching is carried out between the common frequency conversion device and the standby frequency conversion device through a contactor according to the accumulated use time and state of each set of frequency converter. Therefore, after one set of frequency conversion device of the bridge crane of the hydropower station breaks down, the other set of frequency conversion device can be immediately put into use, the downtime due to failure is greatly shortened, the hoisting work of a unit is prevented from being influenced, the time cost is saved, and the economic loss is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to bridge crane technical field, especially relate to a simple and effective redundancy of water and electricity station bridge crane variable frequency drive. BACKGROUND

[0002] In recent years along with the wide application of variable frequency drive technology in hoisting industry, by virtue of its excellent speed regulation performance and no impact start-stop characteristics, it is especially suitable for water and electricity station bridge crane when unit overhauls hoist rotor and other scenes that need precision control hoisting speed and displacement.

[0003] At present, the Chinese utility model with the announcement number CN218974814U discloses a crane double-winding motor frequency converter parallel control circuit. Because the early variable frequency device is high in price and large in size, usually, water and electricity station bridge crane is equipped with only one set of variable frequency drive device. And because of the special working condition of water and electricity station bridge crane, in the actual use process, especially when hoisting rotor, the variable frequency drive device often appears short circuit fault, and it is difficult to remove to the short circuit position for solution in a short time, which greatly affects the water and electricity station unit overhauling work;

[0004] With the progress of technology, the price of variable frequency drive device decreases and the size reduces, so that it is feasible to have redundant variable frequency drive devices in the limited space of water and electricity station bridge crane, and therefore we provide a simple and effective redundancy of water and electricity station bridge crane variable frequency drive. UTILITY MODEL CONTENTS

[0005] The utility model discloses a simple and effective redundancy of water and electricity station bridge crane variable frequency drive, and the advantage is that one set of standby variable frequency device is added on the basis that the general water and electricity station bridge crane drive system has only one set of variable frequency device. Therefore, after the failure of one set of variable frequency device, the other set of variable frequency device is immediately put into use, and the fault downtime is greatly reduced.

[0006] The above technical purpose of the utility model is realized through the following technical scheme: a simple and effective redundancy of water and electricity station bridge crane variable frequency drive, including general frequency converter US and standby frequency converter UF, the general frequency converter US and standby frequency converter UF are electrically connected with contactor K101 and K111 respectively, one end of the general frequency converter US away from the contactor K101 is electrically connected with contactor K102, K103 and K104 respectively, one end of the standby frequency converter UF away from the contactor K111 is electrically connected with contactor K112, K113 and K114 respectively, one end of the contactor K104 away from the general frequency converter US is electrically connected with encoder PG, one end of the contactor K102 away from the general frequency converter US is electrically connected with drive motor M10, and one end of the contactor K103 away from the general frequency converter US is electrically connected with brake resistor R10.

[0007] By the above technical scheme, one set of standby frequency conversion device is added on the basis of one set of frequency conversion device of the general water power station bridge crane driving system, and the contactor is used to automatically or manually switch between the general and standby frequency conversion devices according to the cumulative use time and state of each set of frequency converter.

[0008] The utility model further sets up: the contactor K101 is away from general frequency converter US one end is provided with circuit breaker Q10, circuit breaker Q10 is connected with contactor K101 and contactor K111 respectively.

[0009] The utility model further sets up: general frequency converter US and standby frequency converter UF pass through contactor K101, K111, K113, K103 mutual series connection.

[0010] The utility model further sets up: contactor K101 and K111 are connected with L1 port, L2 port, L3 port of general frequency converter US and standby frequency converter UF respectively.

[0011] The utility model further sets up: contactor K102 is connected with U port, V port, W port of general frequency converter US and drive motor M10 respectively, contactor K112 is connected with U port, V port, W port of standby frequency converter UF.

[0012] The utility model further sets up: contactor K103 and K113 are connected with R+ / UDC+ port, R- port of general frequency converter US and standby frequency converter UF respectively.

[0013] The utility model further sets up: contactor K104 is connected with V+ port, V-:1 port, A+ port, B+ port of encoder PG respectively.

[0014] In conclusion, the utility model has the following beneficial effects:

[0015] By the above technical scheme, one set of standby frequency conversion device is added on the basis of one set of frequency conversion device of the general water power station bridge crane driving system, and the contactor is used to automatically or manually switch between the general and standby frequency conversion devices according to the cumulative use time and state of each set of frequency converter. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the bridge crane variable frequency driving circuit diagram of the utility model. DETAILED DESCRIPTION

[0017] The utility model will be further explained in detail below in combination with the drawings.

[0018] Example 1:

[0019] Reference Figure 1 , a simple and effective redundancy of the bridge crane variable frequency drive of the hydropower station, comprising commonly used frequency converter US and standby frequency converter UF, commonly used frequency converter US and standby frequency converter UF are electrically connected with contactor K101 and K111 respectively, commonly used frequency converter US is electrically connected with contactor K102, K103, K104 respectively at the end away from contactor K101, standby frequency converter UF is electrically connected with contactor K112, K113, K114 respectively at the end away from contactor K111, the end away from commonly used frequency converter US of contactor K104 is electrically connected with encoder PG, the end away from commonly used frequency converter US of contactor K102 is electrically connected with driving motor M10, the end away from commonly used frequency converter US of contactor K103 is electrically connected with brake resistance R10. By increasing a set of standby frequency device on the basis of a set of frequency device of the general hydropower station bridge crane driving system, and through the contactor, automatic or manual switching is carried out between commonly used and standby frequency device according to the cumulative use time and state of each set of frequency converter. Thus, after the failure of a set of frequency device of the hydropower station bridge crane, another set of frequency device can be immediately put into use, greatly reducing the downtime, avoiding affecting the hoisting work of the unit, thereby saving time cost and reducing economic loss.

[0020] Reference Figure 1 , the end away from commonly used frequency converter US of contactor K101 is provided with circuit breaker Q10, and the circuit breaker Q10 is electrically connected with contactor K101 and K111 respectively.

[0021] Reference Figure 1 , commonly used frequency converter US and standby frequency converter UF are connected with each other in series through contactor K101, K111, K113 and K103.

[0022] Reference Figure 1 , contactor K101 and K111 are electrically connected with the L1 port, L2 port and L3 port of commonly used frequency converter US and standby frequency converter UF respectively.

[0023] Reference Figure 1 , contactor K102 is electrically connected with the U port, V port and W port of commonly used frequency converter US and driving motor M10 respectively, and contactor K112 is electrically connected with the U port, V port and W port of standby frequency converter UF.

[0024] Reference Figure 1 The contactors K103 and K113 are respectively electrically connected with the R+ / UDC+ port and the R- port of the common frequency converter US and the standby frequency converter UF.

[0025] Reference Figure 1 The contactors K104 are respectively electrically connected with the V+ port, the V-:1 port, the A+ port and the B+ port of the encoder PG.

[0026] Brief description of the use process: first, when the common frequency device is put into operation, the contactors K101, K102, K103 and K104 are attracted, the common frequency converter US is powered on, and the motor M10, the encoder PG and the braking resistor R10 are connected to the common frequency converter US.

[0027] When the common frequency device needs to be put into operation by the standby frequency device due to short circuit fault, the contactors K111, K112, K113 and K114 are attracted, the standby frequency converter UF is powered on, and the motor M10, the encoder PG and the braking resistor R10 are connected to the standby frequency converter UF.

[0028] At the same time, if there is no other event affecting the operation, the common frequency converter US or the standby frequency converter UF will directly control the operation of the driving motor M10 when receiving the operation instruction.

[0029] The specific embodiment is only an explanation of the utility model, and is not a limitation of the utility model. Those skilled in the art can make modifications to the embodiment without creative contribution after reading the specification, but as long as the modifications are within the scope of the claims of the utility model, they are protected by the patent law.

Claims

1. A simple and effective redundant variable frequency drive for a hydroelectric plant bridge crane comprising a primary variable frequency drive, US, and a backup variable frequency drive, UF, characterized in that: The common frequency converter US and the standby frequency converter UF are respectively connected with contactors K101 and K111, one end of the common frequency converter US away from the contactor K101 is respectively connected with contactors K102, K103 and K104, one end of the standby frequency converter UF away from the contactor K111 is respectively connected with contactors K112, K113 and K114, one end of the contactor K104 away from the common frequency converter US is connected with an encoder PG, one end of the contactor K102 away from the common frequency converter US is connected with a driving motor M10, and one end of the contactor K103 away from the common frequency converter US is connected with a braking resistor R10.

2. A compact and efficient hydroelectric plant bridge crane variable frequency drive redundancy according to claim 1, characterized in that: One end of the contactor K101 away from the common frequency converter US is provided with a circuit breaker Q10, and the circuit breaker Q10 is respectively connected with the contactor K101 and the contactor K111.

3. A compact and efficient hydroelectric plant bridge crane variable frequency drive redundancy according to claim 1 characterized by: The common frequency converter US and the standby frequency converter UF are connected in series through the contactors K101, K111, K113 and K103.

4. A compact and efficient hydroelectric plant bridge crane variable frequency drive redundancy according to claim 1, characterized in that: The contactors K101 and K111 are respectively connected with L1 port, L2 port and L3 port of the common frequency converter US and the common frequency converter UF.

5. A compact and efficient hydroelectric plant bridge crane variable frequency drive redundancy as claimed in claim 1 characterized by: The contactor K102 is respectively connected with U port, V port and W port of the common frequency converter US and the driving motor M10, and the contactor K112 is connected with U port, V port and W port of the common frequency converter UF.

6. A compact and efficient hydroelectric plant bridge crane variable frequency drive redundancy as claimed in claim 1 characterized by: The contactors K103 and K113 are respectively connected with R+ / UDC+ port and R- port of the common frequency converter US and the standby frequency converter UF.

7. A compact and efficient hydroelectric plant bridge crane variable frequency drive redundancy according to claim 1, characterized in that: The contactor K104 is respectively connected with V+ port, V-:1 port, A+ port and B+ port of the encoder PG.

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