CN215646363U

CN215646363U - 6kV switch with tripping and closing signal monitoring functions

Info

Publication number: CN215646363U
Application number: CN202120537508.0U
Authority: CN
Inventors: 吴远记; 朱如义; 邵奇; 傅俊源; 刘斌; 陈海浩; 孔珊珊; 周姚
Original assignee: Ma'anshan Dangtu Power Generation Co ltd
Current assignee: Ma'anshan Dangtu Power Generation Co ltd
Priority date: 2021-03-15
Filing date: 2021-03-15
Publication date: 2022-01-25
Anticipated expiration: 2031-03-15

Abstract

The utility model discloses a 6kV switch with a trip and closing signal monitoring function, and belongs to the technical field of switch signal monitoring. The utility model comprises a monitoring chip, wherein the monitoring chip is arranged in a 6kV switch on-site protection cabinet or an operation box; the input and output terminals of the monitoring chip are connected in series with each tripping and closing loop of the 6kV switch, the monitoring chip is connected with an upper computer, and the current magnitude, the signal pulse time and the waveform information of each tripping and closing loop are transmitted to the upper computer. The utility model has the functions of real-time detection, wave recording and recording of each tripping signal and closing signal of the 6kV switch, provides the basis for the correctness of the switching action in fault analysis, enables the correctness of the switching action to be analyzed more specifically, directly and directionally, and prevents partial equipment from being put into operation under the condition that the fault reason is not the result, thereby avoiding hidden danger caused by the misoperation of the next equipment.

Description

6kV switch with tripping and closing signal monitoring functions

Technical Field

The utility model relates to the technical field of 6kV switch signal monitoring, in particular to a 6kV switch with a tripping signal and closing signal monitoring function.

Background

At present, most 660MW thermal power plants adopt 6kV voltage as an important service voltage level. Users of the voltage class generally do not adopt standby, and once the equipment has switch misoperation and refusal, the generator unit is quickly reduced in load or shut down if the equipment is in a light state, and equipment or personnel injury accidents are caused if the equipment is in a heavy state.

However, when analyzing the malfunction or failure of the 6kV switch, the waveform analysis is often performed only by the unit fault recorder, so as to estimate the correctness of the switching operation. The main tripping and closing signals of the switch are formed by local, remote and protection, but along with the transformation of equipment, the uncertainty of the remote signals and cable interference is increased, so that the source of the tripping signal cannot be determined when the switch is in misoperation.

Through search, the Chinese patent application No. 2020103483216, the application date is 28/4/2020, the name of the utility model creation is: a tripping and closing monitoring circuit and a fault alarm method; the tripping and closing monitoring circuit provided by the application comprises a tripping circuit, a closing circuit and an alarm circuit; the tripping circuit comprises a breaker normally-open auxiliary contact tripping latching relay normally-open contact, a tripping latching relay coil, an on-position monitoring relay, the interval protection tripping contact, a pressing plate and a tripping circuit monitoring relay; the closing loop comprises a breaker normally closed auxiliary contact, a closing latching relay normally contact, a closing latching relay coil, a closing reset contact, a tripping monitoring relay and a closing loop monitoring relay; the normally closed contact of the tripping circuit monitoring relay and the normally closed contact of the closing circuit monitoring relay are connected in series in the alarm circuit. The application can monitor the whole process of the tripping circuit and the closing circuit during the normal operation of the power equipment, particularly can monitor the connection condition of the pressure plate at the tripping outlet, and is favorable for improving the reliability of the safe operation of a power grid. However, the application is not suitable for solving the problem of monitoring the tripping and closing signals of the 6kV switch used in the 660MW thermal power plant.

Disclosure of Invention

1. Technical problem to be solved by the utility model

In order to overcome the problems in the prior art, the utility model provides a 6kV switch with the functions of monitoring tripping and closing signals; the utility model has the functions of real-time detection, wave recording and recording of each tripping signal and closing signal of the 6kV switch, provides the basis for the correctness of the switching action in fault analysis, enables the correctness of the switching action to be analyzed more specifically, directly and directionally, and prevents partial equipment from being put into operation under the condition that the fault reason is not the result, thereby avoiding hidden danger caused by the misoperation of the next equipment.

2. Technical scheme

In order to achieve the purpose, the technical scheme provided by the utility model is as follows:

the utility model discloses a 6kV switch with a trip and closing signal monitoring function, which comprises a monitoring chip, wherein the monitoring chip is arranged in a 6kV switch on-site protection cabinet or an operation box; the input and output terminals of the monitoring chip are connected in series with each tripping and closing loop of the 6kV switch, the monitoring chip is connected with an upper computer, and the current magnitude, the signal pulse time and the waveform information of each tripping and closing loop are transmitted to the upper computer.

As a further improvement of the utility model, the input and output terminals of the monitoring chip are connected in series with an anti-tripping local closing loop, a DCS closing loop, a local tripping loop, a DCS tripping loop, an accident tripping loop and a 6kV motor protection tripping loop of the 6kV switch.

As a further improvement of the utility model, the monitoring chip is of the type Schneider P630.

As a further improvement of the utility model, the X032-1 and X032-2 terminals of the monitoring chip are connected in series between a closing button SB1 and a DCS allowable closing button DC1 of the anti-tripping local closing circuit.

As a further improvement of the utility model, the X032-3 and X032-4 terminals of the monitoring chip are connected in series between a change-over switch ST1 and a DCS closing button DC2 of the DCS closing circuit.

As a further improvement of the utility model, the X032-5 and X032-6 terminals of the monitoring chip are connected in series between the change-over switch ST2 and the switch-off switch SB2 of the local trip circuit.

As a further improvement of the utility model, the X042-1 and X042-2 terminals of the monitoring chip are connected in series between the transfer switch ST2 of the DCS trip circuit and the DCS trip button DC 3.

As a further improvement of the utility model, the X042-3 and X042-4 terminals of the monitoring chip are connected in series between the power supply positive electrode of the accident tripping loop and the accident button SBE.

As a further improvement of the utility model, the X042-5 and X042-6 terminals of the monitoring chip are connected in series between the motor relay protection device K01 and the protection switching pressing plate XB1 of the 6kV motor protection tripping circuit.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:

(1) the utility model relates to a 6kV switch with a trip and closing signal monitoring function, wherein a monitoring chip is connected in series in each trip and closing loop of the original 6kV switch, and the monitoring chip can monitor the current magnitude, the signal pulse time and the waveform of each trip and closing loop, so as to analyze the correctness of the switch action in fault and evaluate the correctness of the source of the trip and closing signal.

(2) According to the 6kV switch with the tripping and closing signal monitoring function, the monitoring chip is arranged in a 6kV switch local protection cabinet or an operation box, the current magnitude and the signal pulse time of a switching-on loop and a tripping loop of the switch are detected in real time, and a basis and a direction are provided for analyzing the reason for the misoperation and the rejection of the switch in an accident.

(3) The 6kV switch with the tripping and closing signal monitoring function can accurately record the time of the conventional switch action and the content of a command waveform and the like by using a monitoring chip, can analyze whether a command sender is correct or not by checking a command source, and can check whether the command signal is interfered by the outside or not by analyzing the waveform. Through the direct instruction analysis to the switch, make equipment failure analysis feasibility improve, better assurance equipment more effectual troubleshooting after the trouble takes place, eliminate the equipment hidden danger, avoid equipment to take hidden danger to put into operation.

Drawings

Fig. 1 is a control circuit diagram of a 6kV switch having a trip/close signal monitoring function according to the present invention.

Detailed Description

For a further understanding of the utility model, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.

Example 1

According to the 6kV switch with the tripping and closing signal monitoring function, a monitoring chip is arranged in a 6kV switch local protection cabinet or an operation box, 2 pairs of tripping signals and 4 pairs of tripping signals are adopted as monitoring signals in the 6kV switch, the input and output terminals of the monitoring chip are connected into each tripping and closing loop of the 6kV switch in series, the monitoring chip is connected with an upper computer, and the current size, the signal pulse time and the waveform information of each tripping and closing loop are transmitted to the upper computer. The method is used for evaluating the correctness of the analysis of the switching action during the fault and is convenient for evaluating the correctness of the sources of tripping and closing signals. The monitoring chip is arranged in a 6kV switch local protection cabinet or an operation box, and is used for detecting the current magnitude and the signal pulse time of a switch closing loop and a tripping loop in real time, so that the basis and the direction are provided for analyzing the reason of switch misoperation and switch failure in an accident.

The monitor chip model used in this embodiment is schneider P630. The method can accurately record the time of the previous switch action, the content of the command waveform and the like, can analyze whether a command sender is correct or not by checking the command source, and can check whether the command signal is interfered by the outside or not by analyzing the waveform. Through the direct instruction analysis to the switch, make equipment failure analysis feasibility improve, better assurance equipment more effectual troubleshooting after the trouble takes place, eliminate the equipment hidden danger, avoid equipment to take hidden danger to put into operation.

Referring to fig. 1, the control circuit of the 6kV switch generally includes an anti-tripping local closing circuit, a DCS closing circuit, a closing coil circuit, a fuse fusing trip circuit, a local trip circuit, a DCS trip circuit, an anti-tripping circuit, a low voltage trip circuit, an accident trip circuit, a 6kV motor protection trip circuit, and a protection power supply circuit (specifically corresponding to the circuits from top to bottom in fig. 1). In the embodiment, the monitoring anti-tripping local closing loop, the DCS closing loop, the local tripping loop, the DCS tripping loop, the accident tripping loop and the 6kV motor protection tripping loop are selected, that is, the input/output terminal of the monitoring chip is connected in series with the anti-tripping local closing loop, the DCS closing loop, the local tripping loop, the DCS tripping loop, the accident tripping loop and the 6kV motor protection tripping loop of the 6kV switch.

Specifically, the X032-1 and X032-2 terminals of the monitoring chip are connected in series between a closing button SB1 and a DCS allowable closing button DC1 of the anti-tripping local closing circuit. And the X032-3 and X032-4 terminals of the monitoring chip are connected in series between a change-over switch ST1 and a DCS closing button DC2 of the DCS closing circuit. The switch ST1 is connected in parallel between the two circuits, and when the switch ST1 is turned to the left, the

terminals

1 and 2 are conducted, and when the switch ST1 is turned to the right, the terminals 3 and 4 are conducted.

The X032-5 and X032-6 terminals of the monitoring chip are connected in series between the transfer switch ST2 and the switch-off switch SB2 of the local trip circuit. The X042-1 and X042-2 terminals of the monitoring chip are connected in series between a transfer switch ST2 of the DCS trip circuit and a DCS trip button DC 3. The switch ST2 is connected in parallel between the two circuits, and when the switch ST2 is turned to the left, the terminals 5 and 6 are conducted, and when the switch ST2 is turned to the right, the

terminals

7 and 8 are conducted.

And the terminals X042-3 and X042-4 of the monitoring chip are connected in series between the power supply anode of the accident trip circuit and the accident button SBE. The terminals X042-5 and X042-6 of the monitoring chip are connected in series between a motor relay protection device K01 and a protection switching pressing plate XB1 of the 6kV motor protection tripping circuit.

The embodiment provides reliable and direct instruction basis for equipment accident analysis, effectively carries out accident analysis and troubleshooting, saves time for equipment safety investment and operation, and provides reliable assistance for enterprises to establish zero non-stop enterprises.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the utility model, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the utility model.

Claims

1. A6 kV switch with tripping and closing signal monitoring functions is characterized in that: the monitoring chip is arranged in a 6kV switch on-site protection cabinet or an operation box; the input and output terminals of the monitoring chip are connected in series with an anti-tripping local closing loop, a DCS closing loop, a local tripping loop, a DCS tripping loop, an accident tripping loop and a 6kV motor protection tripping loop of the 6kV switch, the model of the monitoring chip is Schneider P630, the monitoring chip is connected with an upper computer, and the current magnitude, the signal pulse time and the waveform information of each tripping and closing loop are transmitted to the upper computer.

2. The 6kV switch with the trip/close signal monitoring function according to claim 1, wherein: the X032-1 and X032-2 terminals of the monitoring chip are connected in series between a closing button SB1 and a DCS permission closing button DC1 of the anti-tripping local closing circuit.

3. The 6kV switch with the trip/close signal monitoring function according to claim 2, wherein: and the X032-3 and X032-4 terminals of the monitoring chip are connected in series between a change-over switch ST1 and a DCS closing button DC2 of the DCS closing circuit.

4. The 6kV switch with the trip/close signal monitoring function according to claim 3, wherein: the X032-5 and X032-6 terminals of the monitoring chip are connected in series between the transfer switch ST2 and the switch-off switch SB2 of the local trip circuit.

5. The 6kV switch with the trip/close signal monitoring function according to claim 4, wherein: the X042-1 and X042-2 terminals of the monitoring chip are connected in series between a transfer switch ST2 of the DCS trip circuit and a DCS trip button DC 3.

6. The 6kV switch with the trip/close signal monitoring function according to claim 5, wherein: and the terminals X042-3 and X042-4 of the monitoring chip are connected in series between the power supply anode of the accident trip circuit and the accident button SBE.

7. The 6kV switch with the trip/close signal monitoring function according to claim 6, wherein: the terminals X042-5 and X042-6 of the monitoring chip are connected in series between a motor relay protection device K01 and a protection switching pressing plate XB1 of the 6kV motor protection tripping circuit.