CN206075657U - Experimental device for simulating relay protection of power transmission line - Google Patents

Abstract

The utility model discloses an experimental device for simulating relay protection of a power transmission line, including a primary circuit and a secondary circuit. The primary circuit adopts a 380V three-phase power supply to simulate a 35kV three-phase power supply and its static load; the secondary circuit includes a line protection device, and the line protection device includes a voltage circuit module, a current measurement module, and a protection current module; the primary circuit includes a plurality of resistors and inductors connected to each other, and the output ends of the inductors are respectively connected to the voltage circuit module, the current measurement module, and the protection current module of the line protection device. The experimental device of the utility model has a simple circuit structure and a clear principle. It not only presents the primary circuit of the power transmission line and the secondary circuit of the relay protection to learners in terms of principle and structure, but also allows learners to disassemble and assemble the secondary circuit, thereby improving the experimental training effect of learners.

Description

An experimental device for simulating relay protection of transmission lines

technical field

The utility model belongs to a teaching experiment device, in particular to an experiment device for simulating relay protection of transmission lines.

Background technique

At present, the widely used relay protection comprehensive experimental platform in China generally adopts a closed structure. During the experimental teaching, the wiring and parameter settings are based on the inherent template of the experimental platform. The experimental content and method are single. It is more convenient for the experimental teaching to explain the general principle of short-circuit protection of transmission lines. Due to the closed structure, learners cannot understand the internal structure of the experimental platform system, protect the action sequence and signal processing flow, and cannot establish an intuitive feeling for the wiring and functions of the primary and secondary circuits, and cannot carry out comprehensive training and teaching. Comprehension of comprehensive intuitive concepts of power system short circuits and their protection is disadvantageous.

Utility model content

The purpose of this utility model is to provide an experimental device for simulating the relay protection of transmission lines. The circuit structure is simple and the principle is clear. At the same time, it also allows learners to disassemble and assemble the secondary circuit, so as to improve the experimental training effect of learners.

In order to achieve the above object, the technical solution taken by an embodiment of the utility model is:

Including a primary circuit and a secondary circuit, the primary circuit uses a 380V three-phase power supply to simulate a 35kV three-phase power supply and its static load; the secondary circuit includes a line protection device, and the line protection device includes a voltage loop module, a measurement current module and a protection current module; the primary circuit The loop includes a plurality of interconnected resistance and inductance elements, and the output terminals of the inductance elements are respectively connected to the voltage loop module, the measurement current module and the protection current module of the line protection device.

The beneficial effects produced by the experimental device for simulating transmission line relay protection of the utility model are:

1. The circuit structure is simple and the principle is clear. It not only shows the primary circuit of the transmission line and the secondary circuit of the relay protection to the learners from the principle and structure, but also allows the learners to disassemble and assemble the secondary circuit to improve the learning experience. The effect of experimental training.

2. Using an open experimental platform, the experimental principle, line connection and control loop logic are clear, which is conducive to improving the effect of relay protection experiment teaching, practical training and comprehensive training. The open experimental platform can also adjust the parameters of the primary and secondary loops, and is used for various teaching experiments and scientific research characteristic tests.

Description of drawings

Fig. 1 is a structural schematic diagram of an embodiment of an experimental device for simulating transmission line relay protection of the present invention.

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with specific embodiments of the utility model and corresponding drawings.

Referring to Figure 1, Figure 1 is a schematic diagram of the primary and secondary circuit wiring of the experimental device. The experimental device for simulating the relay protection of transmission lines includes a primary circuit and a secondary circuit. The primary circuit uses a 380V three-phase power supply to simulate a 35kV three-phase power supply and its static state. load; the secondary circuit includes a line protection device, and the line protection device includes a voltage loop module, a measurement current module and a protection current module; the primary circuit includes a plurality of interconnected resistance and inductance elements, and the output terminals of the inductance elements are respectively connected to the voltage of the line protection device Loop module, measurement current module and protection current module.

For the primary part of the line, use L1-L3, R1-R3 to simulate the 15km transmission line, and RL to simulate the load of the transmission line. Considering the different distributions of short-circuit points of typical lines, line fault points are set at output nodes 5, 7 and 9, respectively. The relevant parameters of L1-L3, R1-R3, and RL are shown in Figure 1. The device can realize the simulation of various transmission lines by modifying the parameters of L1-L3, R1-R3, and RL.

The experimental device will simulate the transmission line to form the primary circuit of the experimental device with equivalent resistance and inductance. Since the original transmission line uses 35kV three-phase power supply and the corresponding static load, in the experimental device, a 380V three-phase power supply is used for simulation. Simulating the primary circuit can fully reproduce the physical characteristics of the original transmission line. On the secondary circuit, Sifang CSC-280 line protection device is used as the main protection unit. In order to meet the input characteristics of microcomputer protection, the transformation ratio of current transformer and voltage transformer is specially designed, so as to realize the structure consistent with the original mechanism and relay protection structure of the original transmission line. During the experiment, the whole device fully presented the dynamic characteristics and protection action characteristics consistent with the original 35KV transmission line. Under the premise of adjusting the parameters of the primary circuit, the experimental device can also be used for the fusing characteristic test of the 10KV drop-out fuse.

At output node 5, a fault occurs in the middle section of the simulated line. At the same time, by using the closure of KM1, the occurrence of short-circuit fault is realized. In addition, in order to simulate various short-circuit faults, a three-phase short circuit is realized by closing QZ1, and a phase-to-phase short circuit is realized by opening QZ1.

At output nodes 7 and 9, a fault occurs in the middle of the simulated line. At the same time, using the closure of KM2, the occurrence of short-circuit fault is realized. In addition, in order to simulate various short-circuit faults, a three-phase short circuit is realized by closing QZ2, and a phase-to-phase short circuit is realized by opening QZ2.

Also, by adjusting the value of the RL resistor, load changes are simulated.

In one embodiment of the present invention, the resistance value of the resistance element of the primary circuit is adjustable.

In one embodiment of the utility model, the line protection device outputs through the X3 logic plug-in, and realizes the reliable operation of the circuit breaker through the relay.

The signal input of CSC-280 uses LH1 and LH2 to obtain the load and short-circuit current of the transmission line. Get the voltage of the transmission line through YH.

The logic output of CSC-280 is output through the X3 logic plug-in, and the reliable action of the circuit breaker KM is realized through the TQ and HQ relays and related logic devices.

The above embodiments are used to explain the utility model, rather than to limit the utility model. Within the spirit of the utility model and the protection scope of the claims, any modifications and changes made to the utility model fall into the scope of the utility model. scope of protection.

Claims (3)

1. An experimental device for simulating transmission line relay protection, characterized in that: comprise a primary circuit and a secondary circuit, the primary circuit adopts a 380V three-phase power supply to simulate a 35kV three-phase power supply and its static load; the secondary circuit Including a line protection device, the line protection device includes a voltage loop module, a measurement current module and a protection current module; the primary loop includes a plurality of interconnected resistance and inductance elements, and the output ends of the inductance elements are respectively connected to the Voltage loop module, measurement current module and protection current module. 2. The experimental device according to claim 1, characterized in that: the resistance value of the resistance element of the primary circuit is adjustable. 3. The experimental device according to claim 1 or 2, characterized in that: the line protection device outputs through the X3 logic plug-in, and realizes the reliable action of the circuit breaker through the relay.