CN206533194U - A kind of isolation circuit breakers TT＆C system - Google Patents

Abstract

The utility model is related to a kind of isolation circuit breakers TT＆C system, including the insulating gas condition checkout gear and machine performance detection means for detecting breaker oneself state, and process-level network interchanger and the station level network switch, insulating gas condition checkout gear is by measuring IED connection procedure layer network interchangers, machine performance detection means monitors IED connection procedure layer network interchangers by machine performance, and process-level network interchanger is connected with the communication of the station level network switch.The TT＆C system can reliably monitor the oneself state of isolation circuit breakers, and cohesive process layer and the station level network switch will give overlayer monitors equipment on the data message collected, the performance of breaker can be known in real time with control centre, the technical requirements of New Generation of Intelligent transformer station are met.

Description

An Isolation Circuit Breaker Measurement and Control System

technical field

The utility model relates to a measurement and control system for an isolation circuit breaker.

Background technique

The construction of smart grid is an important part of the national "Twelfth Five-Year" plan. The new generation of smart substation is one of the important links in the construction of smart grid, and the smart isolation circuit breaker is the key equipment of the new generation of smart substation. Running is paramount. The new generation of smart substation clearly puts forward the technical requirements of "measurement digitalization, status visualization, and control network" for the isolation circuit breaker, while the current transformer measurement signal of the traditional isolation circuit breaker is an analog quantity, which is easily disturbed when transmitted to the protection device; The self-status can only be indicated locally, and cannot be transmitted to the power grid for status visualization; self-control is realized through the hard-wiring of the protection cell, the wiring is complicated, the debugging workload is heavy, and there is no networked control function. Moreover, at present, when the circuit breaker is monitored, the state information of the circuit breaker itself cannot be reliably detected. Therefore, in summary, the existing measurement and control methods for the isolation circuit breaker cannot reliably monitor the isolation circuit breaker.

Utility model content

The purpose of the utility model is to provide a measurement and control system for an isolation circuit breaker, which is used to solve the problem that the traditional measurement and control method cannot reliably monitor the isolation circuit breaker.

In order to achieve the above purpose, the solution of the utility model includes a measurement and control system for an isolated circuit breaker, including an insulating gas state detection device and a mechanical state detection device for detecting the state of the circuit breaker itself, as well as a process layer network switch and a station control layer network switch , the insulating gas state detection device is connected to the process layer network switch by measuring the IED, the mechanical state detection device is connected to the process layer network switch by the mechanical state monitoring IED, and the process layer network switch is connected to the station control layer network switch communication connection.

The insulating gas state detection device is a gas density sensor.

The mechanical state detection device includes a displacement sensor for detecting the displacement of the circuit breaker contact, a first current sensor for detecting the current information of the circuit breaker coil, and a second current sensor for detecting the current information of the energy storage motor of the circuit breaker.

The measurement and control system includes a switching value detection device for detecting switching value information of a circuit breaker, and the switching value detection device is connected to the process layer network switch through an intelligent terminal.

The process layer network switch is connected to the station control layer network switch through the measurement and control device and the main monitoring IED respectively.

The measuring IED and the mechanical state monitoring IED are communicatively connected to the process layer network switch through an optical fiber.

In the isolated circuit breaker measurement and control system provided by the utility model, the state of the circuit breaker itself is detected through the insulating gas state detection device and the mechanical state detection device, and the state information of the circuit breaker itself can be reliably detected. In addition, the insulating gas state detection device transmits the collected data information to the process layer network switch by measuring the IED, and the mechanical state detection device transmits the collected data information to the process layer network switch through the mechanical state monitoring IED. The process layer network switch communicates with the station control layer network switch, and the data information is uploaded to the upper layer device through the station control layer network switch. Therefore, the measurement and control system can combine the process layer and the station control layer network switch to send the collected data information to the upper layer monitoring equipment through the network to realize network control; and the station control layer equipment can know the performance of the circuit breaker in real time to realize the status Visualization meets the technical requirements of the new generation of smart substations.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the isolation circuit breaker measurement and control system;

Figure 2 is a schematic diagram of the layout of the components of the isolation circuit breaker measurement and control system;

Fig. 3 is a structural schematic diagram of other types of isolation circuit breaker measurement and control systems;

Fig. 4 is a structural schematic diagram of other types of isolation circuit breaker measurement and control systems;

Fig. 5 is a structural schematic diagram of another type of isolation circuit breaker measurement and control system.

detailed description

Below in conjunction with accompanying drawing, the utility model is described in further detail.

At present, the isolation circuit breaker in the smart substation integrates the functions of circuit breaker, isolation switch, grounding switch, and current transformer. According to the information flow requirements of the isolation circuit breaker in the new generation of smart substation, the signal of the current transformer needs to adopt the SV report of the IEC61850 protocol. The file is digitally transmitted to the protection device and the intelligent terminal. At present, current transformers are divided into traditional electromagnetic type and electronic type. The electromagnetic type current transformer outputs analog signals, and the electronic type current transformer outputs digital signals. If the isolation circuit breaker is integrated with an electromagnetic current transformer, the signal of the electromagnetic current transformer is sent to the merging unit of the analog interface, the merging unit processes the signal and sends it to the protection device in SV The tripping command is sent to the intelligent terminal, among which the merging unit, the protection device and the intelligent terminal can be directly connected by optical fiber. , This method is called network mining and network adjustment. If the isolation circuit breaker is integrated with an electronic current transformer, the signal of the electronic current transformer is sent to the merging unit of the digital interface, and the merging unit processes the signal and sends it to the protection device and the intelligent terminal in the form of an SV message. This part belongs to the structure of the isolation circuit breaker itself, which is a conventional technology, and the electromagnetic transformer and electronic transformer are also conventional technology, so this embodiment will not describe this part in detail, and this The utility model is not limited to the above content either.

When monitoring the isolation circuit breaker, it is necessary to collect the state information of the circuit breaker itself, which mainly includes the state information of the insulating gas (usually SF ₆ ) inside the circuit breaker and the mechanical state information. The insulating gas state information includes the pressure of the insulating gas, Data information such as temperature, density, moisture, and mechanical state information include data information such as circuit breaker coil current, contact displacement, energy storage motor current, etc. Therefore, the isolation circuit breaker measurement and control system provided by the utility model includes an insulating gas state detection device and a mechanical state detection device, these two state detection devices are used to detect data information corresponding to the circuit breaker. In this embodiment, the insulating gas state detection device is an example of a gas density sensor used to detect the density of insulating gas. The mechanical state monitoring device consists of three parts: displacement sensor, first current sensor and second current sensor, wherein the displacement sensor is used to detect the displacement information of the circuit breaker contact, the first current sensor is used to detect the current information of the circuit breaker coil, and the second The current sensor is used to detect the current information of the energy storage motor of the circuit breaker. In addition, since both the current of the circuit breaker coil and the current of the energy storage motor are small currents, the first current sensor and the second current sensor are both small current sensors.

In order to be applicable to smart substations, as shown in Figure 1, the measurement and control system also includes a process layer network switch and a station control layer network switch. Overall, according to the information flow requirements of the new generation of smart substations for the isolation circuit breaker, the status information needs to be transmitted to the station control layer equipment in the form of MMS messages of the IEC61850 protocol. details as follows:

The gas density sensor is connected to the process layer network switch by measuring the IED, and the mechanical state detection device is connected to the process layer network switch by the mechanical state monitoring IED. The gas state information collected by the gas density sensor is sent to the measuring IED, the displacement sensor and the small current sensor respectively collect the contact displacement of the circuit breaker, the coil current and the energy storage motor current information and send it to the mechanical state monitoring IED, the measuring IED and the mechanical state monitoring IED Preprocess the data.

Furthermore, the measurement and control system also includes a switching value detection device for detecting the switching value information of the circuit breaker. The detected switching value remotely signals information such as the opening and closing position of the circuit breaker, alarming, and locking. The switching value detection device is connected to the The process layer network switch, the collected information is uploaded by the process layer network switch through the intelligent terminal. The switching value detection device is conventional equipment, and will not be described in detail in this embodiment.

The process layer network switch communicates with the station control layer network switch through the measurement and control device and the main monitoring IED respectively. The measurement IED and the mechanical status monitoring IED preprocess the data and then transmit it to the main monitoring IED through the process layer network switch. The monitoring main IED converts the data information into intelligent alarm information and sends it to the station control layer equipment through the network message; isolation and disconnection The remote signal of the switch value of the switch is transmitted to the measurement and control device through the GOOSE message of the intelligent terminal, and then transmitted to the station control layer equipment by the MMS message of the measurement and control device. This transmission method enables the status of the isolation circuit breaker to be sensed by the grid in real time, enabling status visualization.

According to the information flow requirements of the isolation circuit breaker in the new generation of smart substations, the control signal of the isolation circuit breaker requires the measurement and control device to receive the MMS message of the station control layer equipment, and then the measurement and control device sends the GOOSE message to the smart terminal. Transform the traditional hard-wiring method into a network control method, cancel the cable directly connecting the protection chamber to the operating mechanism of the isolation circuit breaker, add measurement and control devices and intelligent terminals, and connect to the network switch through optical fibers, and connect the outlet of the intelligent terminal to the operating mechanism through cables. The moving mechanism realizes the networked control and greatly simplifies the wiring method.

As shown in Figure 2, it is the physical layout scheme of the components of the intelligent isolation circuit breaker measurement and control system, including sensor layout, intelligent components and switch layout.

Sensor layout: The sensing optical fiber ring of the optical fiber current transformer is installed at one end of the breaker of the isolation circuit breaker, and the current passes through the middle of the optical fiber ring. The induced optical signal of the fiber optic ring is transmitted to the collector on the bottom bracket of the isolation circuit breaker through the optical fiber. The collector converts the optical signal into an electrical signal and sends it to the merging unit to complete the digital measurement of the current signal. The gas state sensor is installed at the interface of the gas chamber to detect the pressure, density, moisture and other information of the insulating gas of the isolation circuit breaker. The displacement sensor is arranged at the crank arm of the operating mechanism, and is used to measure the movement displacement of the contactor of the isolation circuit breaker. The coil small current sensor is installed in the secondary circuit of the local intelligent cabinet to measure the current of the opening and closing coil of the operating mechanism of the isolation circuit breaker. The combination of contact displacement and opening and closing coil current information can reflect the mechanical characteristics of the isolation circuit breaker. The small current sensor of the energy storage motor is installed in the control circuit of the energy storage motor of the operating mechanism to detect the working state of the energy storage motor.

Arrangement of intelligent components and switches: intelligent components include merging units, intelligent terminals, measurement IEDs, mechanical status monitoring IEDs, protection devices, measurement and control devices, and monitoring main IEDs. Among them, the merging unit, intelligent terminal, measurement IED, mechanical status monitoring IED, process layer network switch (local switch) are installed in the local intelligent cabinet, and the protection device, measurement and control device, monitoring main IED, and station control layer network switch are installed in the in the remote control room. Wherein, the sensor and the intelligent component are connected by cables, and the intelligent component and the switch are connected by optical fibers.

In summary, the measurement and control system provided by the utility model includes three aspects of measurement, monitoring and control, and can realize the functions of "measurement digitalization, status visualization, and control network" of the isolation circuit breaker.

In addition, this embodiment also provides three other measurement and control systems, as shown in FIG. 3 to FIG. 5 .

Figure 3 is a digital function system solution for intelligent isolation circuit breaker measurement, also known as the direct mining and direct jumping solution, that is, the current transformer, the merging unit, and the protection device are directly connected by optical fiber, and the protection device is based on the current information transmitted by the merging unit It is the fastest and most stable protection measure to judge whether to send a trip command to the smart terminal.

Figure 4 is another intelligent isolation circuit breaker measurement digital function system solution, also known as the network mining and network jumping solution, that is, the merging unit and the protection device are connected through a network switch, the signal transmission medium is optical fiber, and the protection device receives and merges through the switch The SV message sent by the unit, and then judge whether to send the tripping GOOSE message to the smart terminal. This scheme is the simplest protection measure.

The systems in Figure 3 and Figure 4 are the most basic structures.

Figure 5 is another intelligent isolation circuit breaker control network function system, which includes two aspects, one is network protection action, and the other is network remote control. The networked protection action is the network trip shown in FIG. 4 , which will not be repeated here. The networked remote control cancels a large number of cables between the remote control system and the operating mechanism of the isolation circuit breaker, and changes the cable hard connection mode into an optical fiber network connection mode. The remote control command of the station control layer sends MMS messages to the measurement and control device through the network switch, and the measurement and control device After command calibration, send GOOSE message to the smart terminal to realize network control.

Specific implementations have been given above, but the utility model is not limited to the described implementations. The basic idea of the present utility model lies in the above-mentioned basic scheme. For those of ordinary skill in the art, according to the teaching of the present utility model, it does not need to spend creative labor to design various deformation models, formulas and parameters. Changes, modifications, replacements and modifications to the embodiments without departing from the principle and spirit of the present utility model still fall within the protection scope of the present utility model.

Claims (6)

1. An isolation circuit breaker measurement and control system, characterized in that it includes an insulating gas state detection device and a mechanical state detection device for detecting the state of the circuit breaker itself, as well as a process layer network switch and a station control layer network switch, the insulating gas The state detection device is connected to the process layer network switch through the measurement IED, the mechanical state detection device is connected to the process layer network switch through the mechanical state monitoring IED, and the process layer network switch is connected to the station control layer network switch through communication. 2. The isolation circuit breaker measurement and control system according to claim 1, characterized in that the insulating gas state detection device is a gas density sensor. 3. The isolation circuit breaker measurement and control system according to claim 1, wherein the mechanical state detection device includes a displacement sensor for detecting the displacement of the circuit breaker contact, a first current sensor for detecting the current information of the circuit breaker coil sensor and a second current sensor for detecting the current information of the energy storage motor of the circuit breaker. 4. The isolation circuit breaker measurement and control system according to claim 1, characterized in that, the measurement and control system includes a switching value detection device for detecting circuit breaker switching value information, and the switching value detection device is connected to the Process level network switch. 5. The isolation circuit breaker measurement and control system according to claim 1, wherein the process layer network switch is connected to the station control layer network switch through a measurement and control device and a monitoring main IED respectively. 6 . The measurement and control system for an isolation circuit breaker according to claim 1 , wherein the measurement IED and the mechanical status monitoring IED are connected to the process layer network switch through optical fibers. 7 .