CN214958882U

CN214958882U - Synchronous signal switching loop

Info

Publication number: CN214958882U
Application number: CN202121459728.2U
Authority: CN
Inventors: 何岸; 董凯凯; 张景峰
Original assignee: China XD Electric Co Ltd; Xian XD Power Systems Co Ltd
Current assignee: China XD Electric Co Ltd; Xian XD Power Systems Co Ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2021-11-30
Anticipated expiration: 2031-06-29

Abstract

The utility model discloses a synchronous signal switching loop, which comprises an A, B and a C three-phase relay which are respectively connected with a control system, wherein each successive electric appliance is provided with two groups of synchronous signal switches which are interlocked, and the two groups of synchronous signal switches are connected with a switching button which is used for controlling the mutual switching of the two groups of synchronous signal switches; the control system is arranged in the high-voltage ice melting operation circuit and the low-voltage maintenance operation circuit at the same time, and the corresponding high-voltage ice melting operation circuit or the corresponding low-voltage maintenance operation circuit is selected to be switched on by switching on any one group of synchronous signal switches. The utility model discloses in the middle of the direct current ice-melt device, need ice-melt operation under the high-pressure state and overhaul the operation under the low pressure state to equipment, can simple efficient realize synchronizing signal and switch.

Description

Synchronous signal switching loop

Technical Field

The utility model relates to a rectifier circuit field, concretely relates to synchronizing signal switches circuit.

Background

A rectifying circuit (rectifying circuit) is a circuit that converts ac power into dc power. Generally, the alternating current with low voltage output by the alternating current step-down circuit is converted into the unidirectional pulsating direct current, which is the rectification process of the alternating current. The voltage after passing through the rectifying circuit is no longer an alternating voltage, but a mixed voltage containing a direct voltage and an alternating voltage, which is conventionally called a unidirectional pulsating direct voltage. Most of the rectifier circuits are composed of a transformer, a main rectifier circuit, a filter and the like. It is widely applied in the fields of speed regulation of direct current motors, excitation regulation of generators, electrolysis, electroplating and the like. After the 70 s of the 20 th century, the main circuit is composed of silicon rectifier diodes and thyristors. The filter is connected between the main circuit and the load and is used for filtering alternating current components in the pulsating direct current voltage. Whether the transformer is arranged or not depends on the specific situation. The transformer is used for matching the alternating current input voltage and the direct current output voltage and electrically isolating the alternating current power grid from the rectifying circuit.

If the thyristor is used in an alternating current loop, the trigger pulse of the thyristor can be effectively controlled only when the positive half wave is emitted, otherwise, the thyristor cannot be conducted. To design a trigger pulse for a thyristor in an ac circuit, the ac power must first be introduced into the design circuit via a transformer and its waveform distinguished by some means, i.e. for the thyristor, when it is a positive half-wave and when it is a negative half-wave, to ensure the correctness of the trigger pulse. This transformer is generally referred to as a synchronous transformer, and the voltage signal transmitted by the transformer is also referred to as a synchronous signal.

The direct-current ice melting device adopts a power supply of a lead-in transformer substation, adopts a rectifying device as a switching device, sends the power supply into a silicon controlled rectifier after passing through a three-winding rectifier transformer, outputs direct current after rectification, and melts ice on a power transmission line by heating a wire and applying direct-current voltage to the power transmission line and carrying out short circuit at the tail end of the power transmission line, so that the phenomenon that the line is broken due to pole falling caused by icing is avoided.

In the prior art, when the equipment needs to be operated in a melting ice mode under a high-voltage state (usually 10kV) and to be overhauled and operated under a low-voltage state (usually 380V), synchronous signal switching cannot be simply and efficiently completed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to the problem among the above-mentioned prior art, provide a synchronizing signal switching loop, can be simple, the ice-melt operation of efficient realization under high-pressure state and the maintenance operation under low-pressure state.

In order to achieve the above object, the present invention provides the following technical solutions:

a synchronous signal switching circuit comprises A, B and C three-phase relays respectively connected with a control system, wherein each successive electric appliance is provided with two groups of interlocked synchronous signal switches which are connected with a switching button for controlling the mutual switching of the two groups of synchronous signal switches; the control system is arranged in the high-voltage ice melting operation circuit and the low-voltage maintenance operation circuit at the same time, and the corresponding high-voltage ice melting operation circuit or the corresponding low-voltage maintenance operation circuit is selected to be switched on by switching on any one group of synchronous signal switches.

As a preferred scheme of the utility model, the high-voltage ice melting operation circuit comprises a first rectifying device with an input end connected with a power supply of a transformer substation, and a direct current output end of the first rectifying device is connected with a line needing ice melting; the transformer substation power supply is connected with a control system through a voltage transformer, and the control system is connected with a control signal end of the first rectifying device.

As an optimized scheme of the utility model, the voltage of transformer substation's power is 10 kV.

As an optimized scheme of the utility model, voltage transformer's specification is 10 kV: 100V.

As a preferred scheme of the utility model, the low-voltage maintenance operation circuit comprises a second rectifying device of which the input end is connected with the low-voltage power supply for the station, and the direct-current output end of the second rectifying device is connected with an experimental load; the station low-voltage power supply is connected with a control system through a transformer, and the control system is connected with a control signal end of the second rectifying device.

As a preferred scheme of the utility model, the station be 380V alternating current power supply with the low voltage power supply.

As an optimized scheme of the utility model, the specification of transformer is 380V: 100V.

Compared with the prior art, the utility model discloses following beneficial effect: two groups of synchronous signal switches interlocked by relays are adopted to control the control system, and the switching of the synchronous signals can be realized by operating the switching button, so that the high-voltage ice melting operation circuit or the low-voltage maintenance operation circuit can be switched on at the same time. The utility model discloses in the middle of the direct current ice-melt device, need ice-melt operation under the high-pressure state and overhaul the operation under the low pressure state to equipment, simple efficient has realized the synchronizing signal and has switched.

Drawings

FIG. 1 is a schematic diagram of a wiring structure of a high-voltage ice-melting operation circuit of the present invention;

FIG. 2 is a schematic diagram of a wiring structure of the low-voltage maintenance operation circuit of the present invention;

FIG. 3 is a schematic diagram of the connection of two sets of synchronous signal switches interlocked with each other for successive appliances of the present invention A;

fig. 4 the utility model discloses change button and A, B and the connection schematic diagram of C three-phase relay.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the high-voltage ice-melting operation circuit includes a first rectifying device whose input end is connected to a power supply of a transformer substation, and the voltage of the power supply of the transformer substation is 10 kV. The direct current output end of the first rectifying device is connected with a line needing ice melting; the power supply of the transformer substation is 10kV in specification: the 100V voltage transformer is connected with a control system, and the control system is connected with a control signal end of the first rectifying device.

Referring to fig. 2, the low voltage maintenance operation circuit includes a second rectifying device having an input terminal connected to a station low voltage power supply, which is a 380V ac power supply. The direct current output end of the second rectifying device is connected with an experimental load; the low-voltage power supply for the station is 380V: the 100V transformer is connected with a control system, and the control system is connected with a control signal end of the second rectifying device.

Referring to fig. 3 and 4, the synchronizing signal switching circuit of the present invention includes A, B and C three-phase relays connected to the control system respectively, each successive electrical appliance is provided with two sets of interlocking synchronizing signal switches, and the two sets of synchronizing signal switches are connected to a switching button for controlling the switching of the switches; the control system is arranged in the high-voltage ice melting operation circuit and the low-voltage maintenance operation circuit at the same time, and selects the corresponding high-voltage ice melting operation circuit or the corresponding low-voltage maintenance operation circuit to be switched on by switching on any one group of synchronous signal switches.

The utility model discloses utilize a pair of normally open of relay, normally closed contact, insert two way synchronizing signal respectively, be the main circuit high pressure synchronizing signal under the normal operating condition and the low pressure synchronizing signal under the maintenance state respectively, separate as the node before the relay.

When the actual work needs, the switching button can be operated according to specific working conditions, the on-off of the three-way (A, B and C phase) relay is controlled, and the switching of the two-way synchronous signals is realized. The interlocking state of the two paths of signals on the machine is ensured while the switching of the two paths of signals is realized. Two way synchronizing signal, get autonomic return circuit all the way, through 10 kV: the 100V voltage transformer is transmitted to a control system after conversion, one path is taken from a 380V power electric loop, and the voltage transformer is connected with a power supply through a 380V power supply circuit: and the 100V transformer is converted and then transmitted to a control system. In the embodiment, two paths of synchronous signals are respectively input into the control system through the relay, and the synchronous signals are provided for the whole equipment. And two paths of synchronous signals are interlocked, so that only one path of synchronous signal is input into the control system at each moment.

The utility model provides a synchronizing signal switches return circuit, especially in the ice-melt device, when equipment need ice-melt operation under high-voltage condition and overhaul the operation under low-voltage condition, this circuit provides a simple efficient solution.

The above-described preferred embodiments of the present invention are not intended to limit the present invention, and it should be understood by those skilled in the art that the present invention can be modified and replaced by other simple modifications and replacements without departing from the spirit and principle of the present invention, and these modifications and replacements also fall within the protection scope of the appended claims.

Claims

1. A synchronization signal switching loop, comprising: the device comprises A, B and C three-phase relays respectively connected with a control system, each successive electric appliance is provided with two groups of interlocked synchronous signal switches, and the two groups of synchronous signal switches are connected with a switching button for controlling the mutual switching of the synchronous signal switches; the control system is arranged in the high-voltage ice melting operation circuit and the low-voltage maintenance operation circuit at the same time, and the corresponding high-voltage ice melting operation circuit or the corresponding low-voltage maintenance operation circuit is selected to be switched on by switching on any one group of synchronous signal switches.

2. The synchronization signal switching loop of claim 1, wherein: the high-voltage ice melting operation circuit comprises a first rectifying device of which the input end is connected with a power supply of a transformer substation, and the direct-current output end of the first rectifying device is connected with a line needing ice melting.

3. The synchronization signal switching loop of claim 2, wherein:

the voltage of the transformer substation power supply is 10 kV.

4. The synchronization signal switching loop of claim 2, wherein: the transformer substation power supply is connected with a control system through a voltage transformer, and the control system is connected with a control signal end of the first rectifying device.

5. The synchronization signal switching loop of claim 4, wherein:

the specification of the voltage transformer is 10 kV: 100V.

6. The synchronization signal switching loop of claim 1, wherein: the low-voltage maintenance operation circuit comprises a second rectifying device of which the input end is connected with the station low-voltage power supply, and the direct-current output end of the second rectifying device is connected with the experimental load; the station low-voltage power supply is connected with a control system through a transformer, and the control system is connected with a control signal end of the second rectifying device.

7. The synchronization signal switching loop of claim 6, wherein:

the low-voltage power supply for the station is a 380V alternating current power supply.

8. The synchronization signal switching loop of claim 6, wherein:

the specification of the transformer is 380V: 100V.