JPS5846818A - Protective relay unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] This invention relates to improving a protective relay device that is integrated with a gas-insulated switchgear and installed on-site so that driving energy can be supplied without impairing reliability. .

In addition to the basic requirements for a stable supply of electricity, modern substation equipment requires the reduction and effective use of construction land.

As equipment is required to simplify maintenance and inspection, and to be in harmony with the environment with a focus on noise, aesthetics, and safety, we use circuit breakers, disconnectors, busbars, current transformers, and lightning arresters.

In many cases, instrument transformers and the like are housed in metal containers sealed with a gas such as SFa, which has excellent insulation performance.

For example, FIG. 1 shows an instrument transformer PD installed between a power transmission line entrance and a busbar in a general substation that uses the atmosphere as an insulating medium.

Disconnector L's Transmission line side current transformer CT1, breaker CB,
An example of the equipment arrangement up to the current transformer CT2 on the busbar side is shown, and FIG. 2 shows an example of a gas insulated switchgear (hereinafter referred to as GI8) in which these power equipments are housed in a metal container filled with gas. Both figures show the approximate dimensions of both types of substations.
It can be seen that in the length direction of the substation site, GI8 in Figure 2 can be reduced by about 30% compared to the atmospheric insulation in Figure 1.

However, since these power equipment and protective relay devices are installed at a distance, for example, the power transformer PD,
As shown in FIG. 3, the number of cable connections for providing system information from the instrument transformers CTI and CT2' to the protective relay device is extremely large. In addition, although not shown in the diagram, there are a group of cables for guiding trip commands (protective output) from the protective relay device to the relevant breaker CB, and a group of cables for guiding disconnector information to the protective relay device. If the current protective relay system is to be followed in which all the protective relay devices are housed in a unit room in order to avoid damage, the following problems arise.

α) As the number of transmission lines for receiving and distributing electricity increases with the expansion of the grid, both the number of cables and their length will increase, which will continue to increase the cost of wiring and increase the difficulty of maintenance. . .

(2) In the limited space of the unit room, a large number of protective relay devices are installed adjacent to each other in a row-by-panel arrangement [and because the wiring ducts for the various cables mentioned above are often shared, it is necessary to This increases the risk of interference between devices and signals passing around, which threatens independence.

(3) Furthermore, it is becoming increasingly difficult to secure installation space when adding protective relay devices as the system expands.

In order to solve these problems, for example, the gas insulated switchgear and protective relay device BY shown in Fig. 4 are integrated into an integrated structure as shown in Fig. A field-installable protective relay device has been proposed.

An object of the present invention is to provide a highly reliable protective relay device that improves the method of supplying circuit drive energy to a field-installed protective relay device that is installed integrally with the gas-insulated switchgear.

The main features of the present invention are the following two points.

(1) A protective relay installed on the top or side of a gas-insulated switchgear so as to maintain insulation from the exposed surface, and whose output is integrated with the gas-insulated switchgear. It was connected to the device's external power supply terminal to supply energy.

(2) For example, a power supply winding was provided at the secondary output of the potential transformer PD, and this was rectified and connected to the power supply external terminal of the protective relay device to supply energy.

The main reason why the present invention proposes a new type of protective relay device having such structural features is that device technology, software technology, optical It is predicted that technology, series transmission technology, etc. will be penetrated into the field of protective relay systems in the future. In other words, the system configuration is based on the highly reliable design concept that is permeated through the system, in which multiple similar types of equipment are operated in parallel, such as two transmission lines per route, double busbars, and three banks of transformers. In cooperation with each other, the independence of protection units (protection relay devices are placed in each line for transmission line protection, one section or tie for bus bar protection, and one bank for transformer protection, and each device is different from each other) The aim is to solve the above-mentioned problems while adhering to the basic idea of adopting the protection principle and maintaining an independent hardware main protection relay and back-up protection relay.

Hereinafter, a typical embodiment of the present invention will be described using FIG. 6.

In Fig. 6, GIS is a gas insulated switchgear, RY is an example of a protective relay device that is integrated with the GIS, PD is a voltage phase transformer, CTI and CT2 are current transformers, and E8 is a grounding switch. DS is the disconnector, CB is the breaker, C0ILI is the trip coil of the breaker, C0IL2 is the closing coil, L is the power transmission line, ID is the current input lead-in line to the protection relay, 'VD
is the voltage input lead-in line, TS is the signal line that leads the trip signal to the trip coil, SIG is the signal line that leads relay movement table display information, etc. to a monitoring panel (not shown), and PS is the DC voltage to the protective relay device. It is a terminal that leads to.

8B indicates a solar cell attached to the upper part of the gas insulated switchgear GIS, and 8BV1 indicates its output terminal. The solar cell SB is provided with an insulating material IN5f so as to maintain a predetermined electrical insulation from the grounded surface of the gas insulated switchgear GIS.
It is attached to the upper surface of the GIS via the fi. The object of the present invention can be achieved by connecting the output terminal SBV'e of the solar cell SB to the DC voltage input terminal PS of the protective relay device described above.

In the above explanation, only a single protective relay device R, Y is installed integrally with the GIS, but multiple protective relay devices R, Y are installed integrally with the GIS. In this case, it is better to provide multiple sets of solar cells and supply voltage in a corresponding manner to each set, since independence between the devices can be maintained and reliability can be improved.

In the above, an example has been described in which power energy is supplied to the protective relay FLY from a solar cell installed integrally with the gas insulated switchgear GIS. Alternatively, an AC voltage may be obtained from the terminal and applied to the terminal PS via a stabilized DC power supply.

In addition, it is also possible to lead the output from the solar cell SB attached to the upper surface of the gas insulated switchgear GI8 through cable wiring and supply power to the protective relay device installed in the unit room as in the past. be.

According to the present invention, the power for the protection relay device can be obtained from solar cells or the grid, so it is possible to provide an economical protection relay device.

(2) Furthermore, since an independent power source can be provided to each protective relay device, independence of the device can be maintained and a highly reliable device can be realized.

Effects such as this can be obtained.

[Brief explanation of the drawing]

Figure 1 shows an example of the installation of a conventional substation that uses atmospheric air as an insulating medium, Figure 2 shows a conventional gas supply line switchgear, and Figure 3 shows the connection between power equipment and protective relay equipment. 4 is a diagram showing the connection relationship between the protective relay device and the gas insulated switchgear, and FIG. 5 is a diagram showing the entire gas insulated switchgear incorporating the protective relay device. FIG. 6 is a diagram showing an embodiment of the present invention.

Claims (1)

[Claims] 1. In a protective relay installed integrally with a gas-insulated switchgear or a gas-insulated substation, driving energy to the protective relay is transferred to the gas-insulated switchgear or a gas-insulated substation. A protective relay device characterized in that power is supplied from a solar cell installed integrally with the gas-insulated substation. , 2. 2. The protective relay device according to item 1 above, wherein driving energy to the protective relay device is introduced from an electric power system. 3. A protection and control device characterized by obtaining driving energy from a solar cell integrated with a gas-insulated switchgear.