CN203722220U - Distribution-network-line entrance-and-exit-line protection system for transformer substation - Google Patents

Abstract

The utility model discloses a protection system for the incoming and outgoing lines of distribution network lines in substations, which includes power grid lines, lightning arresters, electronic current transformers, combined isolating switches, circuit breakers, intelligent component cabinets and transformers, wherein the intelligent component cabinets include main control The arrester, electronic current transformer, combined isolating switch, circuit breaker, main controller and transformer are connected in sequence. The grid line includes the grid incoming line and the grid outgoing line. Both the grid incoming line and the grid outgoing line are connected to the arrester. The utility model has a reasonable design and uses the organic combination of intelligent components to protect the incoming and outgoing lines of the distribution network of the substation, so that it has an isolation function. When a single phase fails, it can be isolated without causing all the multi-phases to fail, further ensuring power supply normal operation, thereby avoiding line damage and fire.

Description

A protection system for incoming and outgoing lines of substation distribution network

technical field

The utility model relates to the field of protection of distribution network lines, in particular to a protection system for incoming and outgoing lines of distribution network lines in substations.

Background technique

Substation generally refers to a concentrated voltage management place that converts high-voltage electricity into low-voltage electricity and then outputs it. In the old substation distribution network input and output settings, the grid line is directly connected to the transformer to form the input and output. When the transformer is overvoltage When overloaded or over-current overloaded, the transformer is easily damaged, and the chain reaction causes large-scale damage to the distribution network lines, and at the same time, it is easy to cause damage to the lines in the substation, which can easily lead to fires.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a substation distribution network line access line protection system, which has an isolation function and can protect the substation distribution network line access line. When a single phase fails, it can be isolated It will not cause all the multi-phase failures, further guarantee the normal operation of power supply, and avoid fires.

The technical solution adopted by the utility model to solve the above problems is: a substation distribution network line inlet and outlet line protection system, including power grid lines, lightning arresters, electronic current transformers, combined isolating switches, circuit breakers, intelligent component cabinets and transformers, The intelligent component cabinet includes a main controller, and the lightning arrester, electronic current transformer, combined isolating switch, circuit breaker, main controller and transformer are connected in sequence, and the power grid line includes a power grid incoming line and a power grid outgoing line, and the power grid Both the incoming line and the grid outgoing line are connected to the arrester.

When the utility model is applied, the voltage to be transformed is input from the power grid, and then sent to the transformer through the lightning arrester, electronic current transformer, combined isolating switch, circuit breaker, and the main controller of the intelligent component cabinet for voltage transformation. During this process, the lightning arrester can effectively protect subsequent smart components from being struck by lightning. The electronic current transformer judges whether the input voltage exceeds the preset value through current sensing. When an abnormal situation occurs, a signal is fed back to the smart component The main controller of the cabinet, and then through the main controller of the intelligent component cabinet to control the combined isolating switch to isolate the damaged line in time, and at the same time operate the circuit breaker to disconnect the damaged line in time so that it will not affect other lines.

Further, the arrester adopts HY10WZ power station type zinc oxide arrester.

Further, the model of the electronic current transformer is PCS-9250-EGC.

Further, the combined isolating switch adopts a GW5 isolating switch.

Further, the circuit breaker adopts ZW intelligent circuit breaker.

Further, the main controller adopts EP36 intelligent controller.

In order to better protect the substation, further, a substation distribution network line incoming and outgoing line protection system also includes a lightning protection device, and the transformer and the intelligent component cabinet are connected to the lightning protection device.

To sum up, the utility model has the following beneficial effects: (1) The lightning arrester, electronic current transformer, combined isolating switch, circuit breaker, main controller and transformer of the utility model are connected in sequence, and the grid lines include the grid input The utility model has a simple overall structure, a reasonable design, is easy to realize, and has low cost. It uses the organic combination of intelligent components to protect the incoming and outgoing lines of the distribution network of the substation, so that its With the isolation function, when a single phase fails, it can be isolated without causing all the multi-phases to fail, further ensuring the normal operation of the power supply. In this way, the utility model can avoid damage to the lines in the transformer and the substation, and can avoid large-area damage to the distribution network lines, thereby preventing fires from occurring.

(2) The components of the utility model are organically combined using mature products in the existing market, which can well guarantee the reliability of the system operation.

(3) The utility model adopts separate components, which is especially suitable for the transformation of old-fashioned substations, without the need for large-scale equipment replacement, and has a significant effect in cost saving.

Description of drawings

     Fig. 1 is a functional block diagram of the utility model.

Detailed ways

The utility model will be further described in detail below in conjunction with the embodiments and accompanying drawings, but the implementation of the utility model is not limited thereto.

Example 1:

As shown in Figure 1, a substation distribution network line incoming and outgoing line protection system includes power grid lines, lightning arresters, electronic current transformers, combined isolating switches, circuit breakers, intelligent component cabinets and transformers, wherein the intelligent component cabinets include main The controller, lightning arrester, electronic current transformer, combined isolating switch, circuit breaker, main controller and transformer are connected in sequence. The grid line includes the grid incoming line and the grid outgoing line. Both the grid incoming line and the grid outgoing line are connected to the lightning arrester.

Because the HY10WZ power station type zinc oxide arrester is molded with integral silicone rubber, it has good sealing performance, excellent explosion-proof performance, pollution-resistant and no-cleaning, and can reduce wet flashes in foggy days. It is resistant to electrical corrosion and aging, small in size, light in weight, and resistant to collisions. It is easy to install and maintain, and can be widely used in 35KV-220KV substations. Therefore, the arrester in this embodiment is preferably a HY10WZ power station type zinc oxide arrester. Because the PCS-9250-EGC electronic current transformer has a simple and reliable insulation method, small size and light weight, the electronic current transformer has a large dynamic range, no magnetic saturation, no electronic voltage transformer resonance phenomenon, and the accuracy has nothing to do with the load. , the secondary output of the electronic current transformer has no risk of open circuit, and the advantages of digital output and optical fiber transmission can be widely used in 10KV-500KV substations. Therefore, the electronic current transformer model of this embodiment is preferably PCS-9250- EGC. Because the GW5 isolating switch has simple structure and good performance, it can be widely used in 35KV-110KV transmission line network, and can play the role of lightning protection and grounding on intelligent components. Therefore, the combined isolating switch of this embodiment adopts GW5 isolating switch. Because the ZW intelligent circuit breaker has the function of braking and extinguishing the arc in the case of overvoltage or overcurrent, it can be widely used in 35KV-110KV transmission and transformation line networks. Therefore, the circuit breaker in this embodiment preferably adopts ZW intelligent circuit breaker device. The intelligent component cabinet of this embodiment preferably adopts the intelligent component cabinet whose main controller is an EP36 intelligent controller. The EP36 intelligent controller has an LCD display, continuous setting of parameters, and simultaneously has a current measurement function and additionally has voltage, power, Frequency, electric energy, phase sequence, required value measurement function and additional protection.

When this embodiment is applied, the voltage to be transformed is input from the power grid, and passes through the HY10WZ power station type zinc oxide arrester, PCS-9250-EGC type electronic current transformer, GW5 type combined isolating switch, ZW intelligent circuit breaker, The main controller is the EP36 intelligent controller, and the intelligent component cabinet is sent to the transformer for voltage transformation. During this process, the HY10WZ power station type zinc oxide arrester can effectively protect the subsequent intelligent components from being struck by lightning, PCS-9250-EGC type The electronic current transformer judges whether the input voltage exceeds the preset value through current sensing. When an abnormal situation occurs, a signal is fed back to the intelligent component cabinet, and then the GW5 combined isolating switch is controlled by the intelligent component cabinet to damage it in time. Line isolation, while operating the ZW intelligent circuit breaker to disconnect the damaged line in time, so that it will not affect other lines.

Example 2:

In order to better protect the substation, this embodiment makes the following further limitations on the basis of Embodiment 1: this embodiment also includes a lightning protection device, and both the transformer and the intelligent component cabinet are connected to the lightning protection device. The lightning protection device of this embodiment is realized by using the existing device, and it should be ensured in the specific design that it can not only prevent direct lightning strikes, but also prevent non-direct lightning strikes, so as to achieve the purpose of protecting the transformer.

As mentioned above, the utility model can be better realized. the

Claims (7)

1. A substation distribution network line incoming and outgoing line protection system, characterized in that it includes grid lines, lightning arresters, electronic current transformers, combined isolating switches, circuit breakers, intelligent component cabinets and transformers, and the intelligent component cabinets include main The controller, the lightning arrester, electronic current transformer, combined isolating switch, circuit breaker, main controller and transformer are connected in sequence, and the grid line includes the grid incoming line and the grid outgoing line, and the grid incoming line and the grid outgoing line are both connected on the arrester. 2. A substation distribution network line inlet and outlet protection system according to claim 1, characterized in that the arrester is a HY10WZ power station type zinc oxide arrester. 3. A substation distribution network line incoming and outgoing line protection system according to claim 1, characterized in that the model of the electronic current transformer is PCS-9250-EGC. 4. A substation distribution network line incoming and outgoing line protection system according to claim 1, characterized in that the combined isolating switch adopts a GW5 isolating switch. 5. A substation distribution network line incoming and outgoing line protection system according to claim 1, wherein the circuit breaker is a ZW intelligent circuit breaker. 6. A substation distribution network line incoming and outgoing line protection system according to claim 1, wherein the main controller is an EP36 intelligent controller. 7. A substation distribution network line incoming and outgoing line protection system according to any one of claims 1 to 6, characterized in that it also includes a lightning protection device, and the transformer and the intelligent component cabinet are connected to the lightning protection device.