CN210490450U - Reverse rotation preventing device for gate hoist of dam of hydraulic power plant - Google Patents
Reverse rotation preventing device for gate hoist of dam of hydraulic power plant Download PDFInfo
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- CN210490450U CN210490450U CN201921928986.3U CN201921928986U CN210490450U CN 210490450 U CN210490450 U CN 210490450U CN 201921928986 U CN201921928986 U CN 201921928986U CN 210490450 U CN210490450 U CN 210490450U
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Abstract
The utility model discloses a dam gate headstock gear of hydroelectric power plant prevents reversal device, including major loop and control circuit, increased a phase sequence protection relay on control circuit, phase sequence protection relay includes positive sequence circuit, negative sequence circuit and protection circuit, is connected with relay KM3 coil on the positive sequence circuit, is connected with relay KM4 coil on the negative sequence circuit, positive sequence relay KM3 and negative sequence relay KM3 auxiliary contact access control circuit participate in logic control; the device does not need to keep the wiring phase sequence, can complete the normal logic operation of the gate, avoids the overhauling wiring error, reduces the line changing time, shortens the overhauling period and ensures the overhauling quality safety.
Description
Technical Field
The utility model relates to a prevent protection device of headstock gear reversal, concretely relates to hydroelectric power plant's dam gate headstock gear prevents reversal device.
Background
The existing gate hoist of the hydraulic power plant needs to check the phase sequence manually again after the motor and an external circuit are overhauled, and the gate can be put into operation and maintenance under the condition of ensuring the correct phase sequence. If the operation is carried out when the phase sequence is wrong, the control gate is descended and is ascended; but the water storage tank descends during ascending, so that the hydropower plant cannot accurately store water and discharge flood, and the risk is brought to the safety of the dam. The defects of manual phase sequence checking are as follows: operation items of operation and maintenance personnel are increased, and the labor and time of the personnel are consumed; the phase sequence verification is carried out manually, and the situation of wrong verification may exist; if the check result is that the phase sequence is reversely connected, the wires need to be disconnected and connected again, the labor and the time are consumed, and the overhaul period is prolonged.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the method mainly solves the problem that manual phase sequence checking can cause error checking, and if the phase sequence is in an opposite phase sequence, the method needs to be disconnected and connected again, so that the labor and time are consumed, and the overhaul period is prolonged.
The utility model discloses a following technical scheme realizes:
a kind of hydroelectric power plant dam gate headstock gear prevents the reversal device, including main circuit and control circuit, increase a phase sequence protective relay on the said control circuit, and insert on the said main circuit;
the phase sequence protection relay comprises a positive sequence circuit and a negative sequence circuit, wherein a coil KM3 is connected to the positive sequence circuit, a coil KM4 is connected to the negative sequence circuit, the positive sequence circuit and the negative sequence circuit are both connected with a control loop, and the positive sequence circuit and the negative sequence circuit are both connected with N phase lines;
the control circuit comprises a branch A, a branch B, a branch C and a branch D, wherein a rising switch SB1 is arranged on the branch A, a relay KM1 coil and a relay KM2 normally closed contact are arranged on the branch B, a falling switch SB2 is arranged on the branch C, a relay KM2 coil and a relay KM1 normally closed contact are arranged on the branch D, L phase lines are respectively connected into the rising switch SB1 and the falling switch SB2, and N phase lines are respectively connected into the relay KM1 coil and the relay KM2 coil;
the branch A is connected with the branch B through a normally open contact of a relay KM 3;
the branch C is connected with the branch D through another normally open contact of the relay KM 3;
the branch A is connected with the branch D through a normally open contact of a relay KM 4;
the branch C is connected with the branch B through another normally open contact of the relay KM 4;
the main loop comprises a three-phase power supply, a motor, a normally open contact of a relay KM1 and a normally open contact of a relay KM2, wherein the normally open contact of the relay KM1 is positively connected between the host and the three-phase power supply in a positive sequence, and the normally open contact of the relay KM2 is negatively connected between the three-phase power supply and the motor in a negative sequence.
When the phase sequence of the power supply is a positive sequence signal, the phase sequence protection relay outputs the positive sequence signal, the coil of the relay KM3 is excited, the normally open contact of the relay KM3 in the control loop is closed, the rising button is pressed, the rising switch SB1 is closed, so that the coil of the relay KM1 on the branch circuit B is excited, the normally open contact of the relay KM1 on the main loop is closed, the positive sequence of the main loop is conducted, and the motor rotates forwards; when a descending button is pressed down, a descending switch SB2 is closed, a relay KM2 coil on a branch circuit D is excited, a relay KM2 normally-open contact on a main circuit is closed, the negative sequence of the main circuit is conducted, and the motor is reversed.
When the phase sequence of the power supply is a negative sequence signal, the phase sequence protection relay outputs the negative sequence signal, the coil of the relay KM4 is excited, the KM4 normally open contact in the control loop is closed, when the rising button is pressed, the rising switch SB1 is closed, the coil of the relay KM2 on the branch circuit D is excited, the KM2 normally open contact on the main loop is closed, the motor is switched on in a positive phase sequence for positive rotation after two phase sequence inversions, and the gate is lifted; when a descending button is pressed down, a descending switch SB2 is closed, and at the moment, a coil of a relay KM1 on a branch circuit B is excited, so that a normally open contact of a relay KM1 on a main circuit is closed, the reverse phase sequence of the motor is switched on to start reverse rotation, and a gate descends.
Further, the main circuit also comprises a fuse FU1 and a breaker QF, wherein the fuse FU1 and the breaker QF are sequentially connected in series between a three-phase power supply and a normally open contact KM 1.
Furthermore, the phase sequence protection relay also comprises a protection circuit, a coil of a relay KM5 is connected to the protection circuit, a coil of the relay KM5 is connected to the N-phase line and is communicated with a control circuit, two normally closed contacts of the relay KM5 are connected to the control circuit, and the two normally closed contacts of the relay KM5 are respectively connected to the branch A and the branch C.
When a defect occurs or low voltage occurs, the coil of the relay KM5 is excited, so that the normally closed contact of the relay KM5 on the control loop is disconnected, and at the moment, all loops cannot be conducted, thereby playing a role in protection.
Further, the branch circuit A also comprises a normally closed stop switch SB 3.
Further, the branch C further comprises a normally closed stop switch SB 3.
The utility model discloses have following advantage and beneficial effect: the operation can be completed only by operating according to the ascending and descending buttons on the panel, and the ascending and descending operation of the gate can be completed. The phase sequence does not need to be checked after the maintenance, so that the operation time of operation and maintenance personnel is reduced; meanwhile, the error of checking the phase sequence caused by human negligence is avoided, so that the operation of the gate is wrong; meanwhile, normal logic operation of the gate can be completed without keeping the wiring phase sequence, so that the wiring error in maintenance is avoided, the wiring changing time is reduced, the maintenance period is shortened, and the maintenance quality safety is ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of a reverse rotation preventing device of a gate hoist.
Reference numbers and corresponding part names in the drawings:
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Example 1
Referring to the attached figure 1, the device for preventing the gate hoist of the dam of the hydraulic power plant from reversing comprises a main loop and a control loop, wherein a phase sequence protection relay is added on the control loop and is connected to the main loop. The phase sequence protection relay comprises a positive sequence circuit and a negative sequence circuit, wherein the positive sequence circuit is connected with a coil of a relay KM3, and the negative sequence circuit is connected with a coil of a relay KM 4; the control circuit comprises four branches, namely a branch A, a branch B, a branch C and a branch D, wherein the branch A is connected with a rising switch SB1, the branch B is connected with a relay KM1 coil and a relay KM2 normally closed contact, the branch C is provided with a falling switch SB2, and the branch D is connected with a relay KM2 coil and a relay KM1 normally closed contact; in the main loop, the three-phase power supply, the motor, the normally open contact of the relay KM1 and the normally open contact of the relay KM2 are included, the normally open contact of the relay KM1 is connected between the three-phase power supply and the motor in a positive sequence, and the normally open contact of the relay KM2 is connected between the three-phase power supply and the motor in a reverse sequence.
When the phase sequence of the power supply is consistent with the phase sequence input by the relay, the relay outputs a positive sequence signal to switch on the control loop, the coil of the relay KM3 is excited, and the normally open contact of the relay KM3 in the control loop is closed; when a gate rising button is pressed down, a rising switch SB1 in the control loop is closed, the branch A and the branch C are conducted, the coil of the relay KM1 is excited, the normally open contact of the relay KM1 on the main loop is closed, the positive phase sequence of the motor is switched on at the moment to rotate positively, and the gate rises. When the gate is to be descended, the descending button is pressed down, the descending switch SB2 is closed, the ascending switch is disconnected, the coil of the relay KM2 on the branch circuit D is excited, the normally open contact of the relay KM2 in the main loop is closed, the reverse phase sequence of the motor is switched on for reversing, and the gate descends.
When the phase sequence of the power supply does not accord with the phase sequence input by the phase sequence protection relay, the phase sequence protection relay outputs a signal from a negative sequence line to connect a control loop, at the moment, a coil of the relay KM4 is excited, and a normally open contact of the relay KM4 in the control loop is closed. After the gate rising button is pressed, the rising switch SB1 is closed, and at the moment, a current signal is transmitted to the branch circuit D from the branch circuit A through the closed relay KM4 normally open contact, then the relay KM2 is excited, so that the relay KM2 normally open contact on the main loop is closed, at the moment, the motor is switched on twice in a reverse phase sequence to rotate forwards, and the gate rises. When a descending button is pressed, a descending switch SB2 is closed, a signal is transmitted to a branch B from a branch C through a normally open contact of a relay KM4, a coil of the relay KM1 on the branch B is excited, the normally open contact of the relay KM1 on a main loop is closed, the motor is switched on in a reverse phase sequence, the motor starts to rotate reversely, and a gate descends.
Example 2
On the basis of the above embodiment, the present embodiment: branch a in the control circuit also includes a normally closed switch SB3, and branch C also includes a normally closed switch SB 3.
The four branch circuits A, B, C, D on the control loop are respectively connected through a relay KM3 normally open contact and a relay KM4 normally open contact to form four loops A, B, C and D.
The branch A and the branch B form a loop A through a normally open contact of the relay KM3,
the branch C and the branch D form a loop B through a normally open contact of the relay KM3,
the branch A and the branch D form a loop C through a normally open contact of the relay KM4,
the branch C and the branch B form a loop D through a normally open contact of the relay KM4,
example 3
On the basis of the above embodiment, the present embodiment: the phase sequence protection relay further comprises a protection circuit, a relay KM5 coil is connected to the protection circuit, the relay KM5 coil is connected to the N-phase line and is communicated with the control circuit, two relay KM5 normally closed contacts are connected to the control circuit, and the two relay KM5 normally closed contacts are connected to the branch A and the branch C respectively.
When a defect occurs or low voltage occurs, the phase sequence protection relay outputs a signal from a protection circuit, and the coil of the relay KM5 is excited, so that the normally closed contact of the relay KM5 on the control loop is disconnected, and at the moment, each loop is not conducted, thereby playing a protection role.
Example 4
On the basis of the above embodiment, the present embodiment: the main circuit also comprises a fuse FU1 and a breaker QF, wherein the fuse FU1 and the breaker QF are sequentially connected in series between a three-phase power supply and a normally open contact KM 1.
Fuse FU1 is used for melting the melt by its own heat after the current exceeds the specified value for a while, thus breaking the circuit; a current protector is made by applying the principle.
The breaker QF is a switching device capable of closing, carrying, and opening/closing a current under a normal circuit condition and a current under an abnormal circuit condition within a prescribed time.
The circuit breaker QF and the fuse FU1 are provided for protecting the circuit from damage, and protect the motor.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A kind of hydroelectric power plant dam gate headstock gear prevents the reversal device, including main circuit and control circuit, characterized by that, increase a phase sequence protective relay on the said control circuit, and insert on the said main circuit;
the phase sequence protection relay comprises a positive sequence circuit and a negative sequence circuit, wherein a coil KM3 is connected to the positive sequence circuit, a coil KM4 is connected to the negative sequence circuit, the positive sequence circuit and the negative sequence circuit are both connected with a control loop, and the positive sequence circuit and the negative sequence circuit are both connected with N phase lines;
the control circuit comprises a branch A, a branch B, a branch C and a branch D, wherein a rising switch SB1 is arranged on the branch A, a relay KM1 coil and a relay KM2 normally closed contact are arranged on the branch B, a falling switch SB2 is arranged on the branch C, a relay KM2 coil and a relay KM1 normally closed contact are arranged on the branch D, L phase lines are respectively connected into the rising switch SB1 and the falling switch SB2, and N phase lines are respectively connected into the relay KM1 coil and the relay KM2 coil;
the branch A is connected with the branch B through a normally open contact of a relay KM 3;
the branch C is connected with the branch D through another normally open contact of the relay KM 3;
the branch A is connected with the branch D through a normally open contact of a relay KM 4;
the branch C is connected with the branch B through another normally open contact of the relay KM 4;
the main loop comprises a three-phase power supply, a motor, a normally open contact of a relay KM1 and a normally open contact of a relay KM2, wherein the normally open contact of the relay KM1 is positively connected between the host and the three-phase power supply in a positive sequence, and the normally open contact of the relay KM2 is negatively connected between the three-phase power supply and the motor in a negative sequence.
2. The apparatus of claim 1, further comprising a fuse FU1 and a breaker QF, wherein the fuse FU1 and the breaker QF are sequentially connected between a three-phase power source and the normally open contact KM 1.
3. The device for preventing reversal of a gate hoist of a hydroelectric power plant dam as claimed in claim 1, wherein the phase sequence protection relay further comprises a protection circuit, a coil of relay KM5 is connected to the protection circuit, a coil of relay KM5 is connected to a N-phase line to be connected with a control circuit, two normally closed contacts of relay KM5 are connected to the control circuit, and the two normally closed contacts of relay KM5 are respectively connected to branch A and branch C.
4. The apparatus of claim 1, wherein said branch a further comprises a normally closed stop switch SB 3.
5. The apparatus of claim 1, wherein said branch C further comprises a normally closed stop switch SB 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921928986.3U CN210490450U (en) | 2019-11-08 | 2019-11-08 | Reverse rotation preventing device for gate hoist of dam of hydraulic power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921928986.3U CN210490450U (en) | 2019-11-08 | 2019-11-08 | Reverse rotation preventing device for gate hoist of dam of hydraulic power plant |
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| CN210490450U true CN210490450U (en) | 2020-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921928986.3U Active CN210490450U (en) | 2019-11-08 | 2019-11-08 | Reverse rotation preventing device for gate hoist of dam of hydraulic power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111926782A (en) * | 2020-09-24 | 2020-11-13 | 钛能科技股份有限公司 | Gate control device with artificial intelligence |
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2019
- 2019-11-08 CN CN201921928986.3U patent/CN210490450U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111926782A (en) * | 2020-09-24 | 2020-11-13 | 钛能科技股份有限公司 | Gate control device with artificial intelligence |
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