GB/T 24836-20181100kV gas-insulated metal-enclosed switchgear (English PDF)

1.1 Scope

This standard specifies the use conditions, rating, design and structure, test, and communication of AC 1100kV gas insulated metal-enclosed switchgear. Use guidelines, transportation, storage, installation, operation and maintenance.

This standard applies to 1100kV indoor and outdoor installation, frequency 50Hz single-pole closed SF6 gas insulated metal-enclosed switch The insulation is obtained at least partially through the insulating gas rather than the air at atmospheric pressure.

For the convenience of the use of this standard, the terms "GIS" and "switching device" are used to describe "gas-insulated metal-enclosed switchgear".

The gas-insulated metal-enclosed switchgear covered by this standard is composed of individual components that can be directly connected together, and these Components can only be operated this way.

According to the requirements, this standard has improved and supplemented the relevant standards that constitute the individual components of GIS.

1.2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 1040.1-2006 Determination of tensile properties - Part 1: General

GB/T 1408.1-2006 Test methods for electrical strength of insulating materials - Part 1

GB/T 1409-2006 Measuring the permittivity and dielectric loss of electrical insulating materials at power frequency, audio, high frequency (including the wavelength of meter wave) Recommended method of consumption factor

GB/T 1410-2006 Test method for volume resistivity and surface resistivity of solid insulating materials

GB/T 1411-2002 Dry solid insulation material resistance to high voltage, low current arc discharge test

GB/T 1984-2014 high voltage AC circuit breaker

GB/T 1985-2014 high voltage AC disconnector and earthing switch

GB/T 2035 plastic terminology and its definition

GB/T 2423.17 Environmental testing of electric and electronic products - Part 2: Test method test Ka. salt spray

GB/T 2567-2008 resin casting body performance test method

GB/T 2900.8 Electrotechnical terminology insulator

GB/T 2900.19 Electrotechnical terminology high voltage test technology and insulation coordination

GB/T 3785 (all parts) Electroacoustic sound level meter

GB/T 4109 insulating sleeve with AC voltage higher than 1000V

GB/T 4472-2011 Determination of density and relative density of chemical products

GB/T 7354 partial discharge measurement

GB/T 8905 SF6 electrical equipment in gas management and testing guidelines

GB/T 9341-2008 Determination of bending properties of plastics

GB/T 9789-2008 Metal and other inorganic coatings, sulfur dioxide corrosion test under normal condensation conditions

GB/T 11022-2011 Common technical requirements for high voltage switchgear and control equipment standards

GB/T 11023 high-voltage switchgear sulphur hexafluoride gas seal test method

GB/T 12022 industrial sulfur hexafluoride

GB/T 13540 high-voltage switchgear and control equipment for seismic requirements

GB/T 16927.1 High Voltage Test Technique Part 1: General Definitions and Test Requirements

GB/T 21429 Definition of hollow composite insulators for outdoor and indoor electrical equipment, test methods, acceptance criteria and design recommendations

GB/T 22381 Gas insulated metal-enclosed switchgear with rated voltage of 72.5kV and above and fluid-filled and extruded insulated electric power Cable connection fluid filled and dry cable termination

GB/T 22382-2017 Gas-insulated metal-enclosed switchgear with rated voltage 72.5kV and above and power transformer direct connection

GB/T 22567-2008 Test method for determining glass transition temperature of electrical insulating materials

GB/T 23752 Pressure-bearing and non-pressure-bearing hollow porcelain and glass insulators for electrical equipment with rated voltages above 1000V

GB/T 26218 (all parts) Selection and sizing of high-voltage insulators used under dirty conditions

GB/T 27761-2011 Test method for weight loss and residual amount of thermogravimetric analyzer

GB/T 28537 Use and treatment of sulphur hexafluoride (SF6) in high voltage switchgear and control equipment

2.1 Overview

According to the provisions of Chapter 2 of GB/T 11022-2011, and supplemented as follows.

Certain components of the GIS, such as pressure relief devices and pressure and density monitoring devices, may be affected by altitude. Manufacture if needed The factory should take appropriate measures.

2.2 Normal use conditions

According to the provisions of 2.2 of GB/T 11022-2011, the specific requirements are shown in Table 101.

2.3 Special conditions of use

According to the provisions of 2.3 of GB/T 11022-2011, the specific requirements are shown in Table 101.

If there is a case where the use is greater than ( >) in the table, the specific value shall be determined by the user in accordance with the provisions of GB/T 11022-2011.

Note 2. The pollution levels d and e are in accordance with 8.3 of GB/T 26218.1-2010.

Note 3. When the temperature is low, pay attention to the effect of liquefaction of SF6 gas on the normal use of the product.

3.101 Metal-enclosed switchgear and control equipment

In addition to the access line, the switchgear and control equipment are completely enclosed by the grounded metal casing. [GB/T 2900.20-2016, definition 4.4]

3.102 Gas insulated metal-enclosed switchgear

At least a portion of a metal-enclosed switchgear that uses a gas above atmospheric pressure as an insulating medium.

Note 1. Three-pole closed gas-insulated switchgear is suitable for switchgear with three poles enclosed in a common enclosure.

Note 2. Unipolar enclosed gas insulated switchgear is suitable for switchgear enclosed in a separate enclosure. [GB/T 2900.20-2016, definition 4.5]

3.103 Enclosure for gas-insulated switchgear

Gas-insulated switchgear enclosure for gas insulated switchgear.

A gas-insulated metal-enclosed switchgear component that safely maintains the insulating gas under specified conditions At the edge level, and protect the inside of the device from external influences and provide security for personnel.

3.104 Removable link

Removable connection removablelink The components of the conductor can easily isolate and remove the two parts of the GIS from each other.

3.105 Compartment

A part of the gas-insulated metal-enclosed switchgear is completely enclosed except that it is connected and controlled to be opened.

Note 1. Rewrite GB/T 2900.20-2016, definition 5.6.

Note 2. The compartments can be named according to the main components inside them, such as the circuit breaker compartment and the busbar compartment.

3.106 Component

Main components of the main circuit and grounding circuit of a gas-insulated metal-enclosed switchgear that achieves specific functions (eg circuit breakers, isolation) Off, load switch, transformer, bushing, busbar, etc.).

3.107 Support insulator

Supporting one or more pole conductors or internal insulators that support and secure the arc chute, which may be basin insulators or insulated tables, Columns, tubes, etc.

3.108 Partition

A support insulator that separates a compartment from other compartments, which is a non-ventilated basin insulator.

Note: Rewrite GB/T 2900.20-2016, definition 5.7.

3.109 Bushing

A structural member that can carry and insulate one or more pole conductors at the end of the casing, including the manner in which it is connected.

3.110 Main circuit

The gas-insulated metal contained in the circuit for delivering electrical energy encloses all of the conductive components of the switchgear.

Note: Rewrite GB/T 2900.20-2016, definition 7.2.

3.111 Auxiliary circuit

All of the gas-insulated metal-enclosed switchgear included in the circuit for control, measurement, signal and regulation (unlike the main circuit) Conductive parts.

Note 1. Rewrite GB/T 2900.20-2016, definition 7.4.

Note 2. The auxiliary circuit of the gas insulated metal-enclosed switchgear includes the control and auxiliary circuits of the switchgear.

3.112 Design temperature of enclosures

The maximum temperature that the enclosure can achieve under the most severe conditions of use specified.

3.113 Design pressure of enclosures

Used to determine the relative pressure of the housing design.

Note 1. It is at least equal to the highest pressure inside the casing when the maximum temperature at which the insulating gas can be reached under the most severe conditions of use specified.

Note 2. The design pressure is determined without regard to the transient pressure during or after the breaking operation (eg circuit breaker).

3.114 Design pressure of partition

The design pressure of the partition.

Relative pressure on both sides of the partition.

3.115 Operating pressure of pressure relief device

The relative pressure at which the pressure relief device is released.

3.116 Routine test pressure of enclosures and partition

All separators and enclosures should be subjected to relative pressure after manufacture.

3.117 Type test pressure of enclosures and partition

Type test pressure of the outer casing and partition.

The relative pressure that all separators and casings should withstand during type testing.

3.118 Fragmentation

Damage to the casing due to increased pressure, accompanied by solid material thrown.

Note: The term "no crack in the casing" is explained as follows.

---The compartment has no blasting;

--- No solid parts fly out of the compartment. The exceptions are.

---The components of the pressure relief device if they are directly projected in the specified direction;

--- The burning particles and molten material produced by the shell burning.

3.119 Destructive discharge

In the case of electrical stress, the phenomenon related to insulation failure, the discharge completely bridges the tested insulation, and the voltage drop between the electrodes is zero or almost It is zero.

3.120 Service period

Until the time required for repair, including opening the inflatable compartment.

3.121 Transport unit

A component of a gas-insulated metal-enclosed switchgear that can be shipped without disassembly.

4.1 Overview

The rating of 1100kV gas insulated metal-enclosed switchgear and its operating mechanism and auxiliary equipment consists of the following parameters.

a) rated voltage (Ur);

b) rated insulation level;

c) rated frequency (fr);

d) rated current (Ir) (of the main circuit);

e) rated short-time withstand current (Ik) (for primary and ground circuits);

f) rated peak withstand current (Ip) (for main and ground loops);

g) rated short circuit duration (tk);

h) the ratings of the components that form part of the gas-insulated metal-enclosed switchgear, including their operating mechanisms and auxiliary equipment;

i) The rated flushing level of the gas for insulation and/or opening and closing.

4.2 Rated voltage of the device (Ur)

At 1100 kV, components that form part of the GIS can have independent voltage ratings in accordance with their respective standards.

4.3 Rated insulation level

The rated insulation level of 1100kVGIS is shown in Table 102.

The components included in the GIS may have a defined level of insulation. Although an internal fault can occur by selecting an appropriate level of insulation The rate is very low, but measures to limit external overvoltages (eg, lightning arresters) should also be considered.

Note 1. According to the CIGRE study, the characteristic ratio of the withstand voltage of the standard test is Ud/Up=0.45 and Us/Up=0.75 for SF6 gas insulation. table The Ud value and the Us value given in 102 are calculated based on the coefficient.

Note 2. For the exposed parts of the casing (if any), see GB/T 4109.

Note 3. The results of the study of the ability of the waveform to be a standard lightning impulse and operational shock waveform, and the ability of the equipment to withstand other types of shock have not been determined.

Note 4. The choice of alternative insulation levels for equipment with a specific rated voltage is based on insulation fit studies, taking into account transients due to spontaneous opening and closing Voltage.

Note 1. The values in parentheses in column (3) are the effective value of the power frequency voltage applied to the opposite terminal, 1.0Ur/3 (combined voltage).

Note 2. The values in parentheses in columns (6) and (8) are 1.0Ur 2/3 (combined voltage) applied to the power-frequency voltage at the opposite terminal.

4.4 Rated frequency (fr)

50Hz.

4.5 Rated current and temperature rise

4.5.1 Rated current (Ir)

According to the provisions of 4.5.1 of GB/T 11022-2011, and supplemented as follows.

Some main loops (busbars and branch buses) of GIS may have different current ratings.

4.5.2 Temperature rise

According to the provisions of 4.5.2 of GB/T 11022-2011, and supplemented as follows.

If the temperature rise of some components in GIS is not covered by GB/T 11022-2011, they shall not exceed the requirements specified in their component standards. Temperature rise limit.

Note: If the temperature rise of the outer casing part that is not accessible to the operator is equal to or higher than 65K, measures must be taken to ensure that the surrounding insulation material is not damaged.

4.6 Rated short-time withstand current (Ik)

According to the provisions of 4.6 of GB/T 11022-2011.

4.7 Rated peak withstand current (Ip)

According to the provisions of 4.7 of GB/T 11022-2011, and supplemented as follows.

Note: In principle, the rated short-time withstand current and rated peak withstand current of the main circuit must not exceed the corresponding amount of the weakest component of its series connected components. Value.

4.8 Rated short circuit duration (tk)

2s.

4.10 Shut-off device and rated power frequency of auxiliary and control circuits

According to the provisions of 4.10 of GB/T 11022-2011, and supplemented as follows.

The rated power frequency of the operating mechanism and the auxiliary circuit is used to determine the operating conditions and the frequency of the rise in the temperature of these devices.

4.12 Rated filling level of gas or liquid for insulation and/or opening and closing

According to the provisions of 4.12 of GB/T 11022-2011.

5.1 Overview

The 1100kV GIS should be designed to ensure safe, reliable operation, inspection and maintenance, grounding of the connecting cable, and cable failure. […]