GB/T 3804-2017High voltage alternating current switches for rated voltage above 3.6 kV and less than 40.5 kV (English PDF)

1.1 Scope

This standard applies to the rated voltage of 3.6kV~40.5kV, the frequency is 50Hz, installed indoors or outdoors and has the function of closing and breaking.

Flow rating of three-pole AC load switch and isolated load switch. This standard also applies to single-pole load switches for three-phase systems.

This standard also applies to the operating mechanism of these load switches and their auxiliary equipment.

The isolation function of the isolated load switch should also meet GB/T 1985-2014.

This standard does not cover load switches that rely solely on human energy storage.

The general principles and provisions of this standard also apply to unipolar load switches in single-phase systems. Insulation test and closing and breaking test the requirements shall meet the requirements for the intended use.

This standard specifies the requirements for general purpose, special purpose and special purpose load switches used in power distribution systems.

Assume that the opening and closing operations are performed according to the manufacturer's instructions, and a closing operation can be performed immediately after the breaking operation, but the closing is performed.

The breaking operation cannot be performed immediately after the operation because the breaking current may exceed the rated breaking current of the load switch.

Note 1. In addition to requiring a special distinction, the term "load switch" represents all types of load switches and isolated load switches within the scope of this standard.

Note 2. The grounding switch is not included in the scope of this standard. The earthing switch, which is part of the load switch, is included in GB/T 1985-2014.

Note 3. This standard does not apply to switchgear with load switch as accessory for high-voltage fuse complete device or its base, nor for complete set of fuses.

Switching device for opening and closing operation of the device.

1.2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.

Pieces. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 311.1-2012 Insulation coordination Part 1. Definitions, principles and specifications (IEC 60071-1:2006, IEC 60071-1 Am1.2010, MOD) GB/T 762-2002 standard current rating (eqvIEC 60059.1999) GB/T 1984-2014 High voltage AC circuit breaker (IEC 62271-100:2008, MOD) GB/T 1985-2014 High voltage AC disconnector and earthing switch (IEC 62271-102:2001 A1.2011, MOD) GB/T 2900.20-2016 Electrotechnical terminology high voltage switchgear (IEC 60050 (441). 1984, MOD) GB/T 4208-2008 Shell protection class (IP code) (IEC 60529:2001, IDT) GB/T 4585-2004 Artificial contamination test for high voltage insulators for AC systems (IEC 60507:1991, IDT) GB/T 11022-2011 Common technical requirements for high-voltage switchgear and controlgear standards (IEC 62271-1:2007, MOD) GB/T 16926-2009 High-voltage AC load switch-fuse combination electric appliance (IEC 62271-105:2002, MOD) GB/T 29489-2013 Inductive load opening and closing of high voltage switchgear and control equipment (IEC 62271-110:2009, MOD)

3.1 General terms

3.1 of GB/T 11022-2011 is applicable and supplemented as follows.

3.1.101

Neutral point effective grounding system effectivelylyearthedneutralsystem the system is grounded with a sufficiently low impedance that the ratio of zero-sequence reactance to positive-sequence reactance (X0/X1) is positive under all system conditions and Less than 3, the ratio of the zero sequence resistance to the positive sequence reactance (R0/X1) is positive and less than 1. Usually this system is a (neutral) direct grounding system or (neutral) low impedance grounding system.

Note. The correct evaluation of the grounding conditions must consider not only the physical grounding conditions around the location but also the entire system.

3.1.102

Neutral point non-effective grounding system non-effectivelyearthedneutralsystem in addition to meeting the grounding system other than the neutral point effective grounding system given in 3.1.101. Usually this system is a neutral point insulation system, (Neutral) High impedance grounded system or (neutral) resonant grounding system.

Note. The correct evaluation of the grounding conditions must consider not only the physical grounding conditions around the location but also the entire system.

3.2 Assembly of switchgear and control equipment

3.2 of GB/T 11022-2011 is applicable.

3.3 Components of the final assembly

3.3 of GB/T 11022-2011 is applicable.

3.4 Switching device

3.4 of GB/T 11022-2011 is applicable and supplemented as follows.

3.4.101

Load switch

Capable of closing, carrying and breaking current under normal loop conditions (which may include specified overload operating conditions), as well as in specified anomalies A switching device that carries current for a specified period of time under a loop condition (such as a short circuit condition).

3.4.102

Isolation load switch disconnectingswitch the load switch that meets the requirements of the isolating switch at the opening position.

3.4.103

Universal load switch generalpurposeswitch in the power distribution system, it is able to close and break all currents that normally occur until its rated breaking current, as well as short load and close Line current load switch.

3.4.103.1

E1 load switch classE1generalpurposeswitch A universal load switch capable of breaking the load current and the basic electrical life of the short circuit.

Note. This level is suitable for load switches that perform infrequent opening and closing operations or allow proper inspection and replacement of the opening and closing parts.

3.4.103.2

E2 load switch classE2generalpurposeswitch A universal load switch capable of interrupting load current and short-circuiting medium electrical life.

Note. This level is suitable for infrequent opening and closing operations, and does not allow or can not check and replace the load switch of the opening and closing parts.

3.4.103.3

E3 class load switch classE3generalpurposeswitch A universal load switch capable of interrupting load current and short-circuiting high electrical life.

Note. This level is suitable for the frequent opening and closing operation, and does not allow or can not check and replace the load switch of the opening and closing parts.

3.4.103.4

M1 load switch classM1switch Load switch with 1000 operating mechanical life.

3.4.103.5

M2 class load switch classM2switch Special use case with 5000 extended mechanical life and frequently operated load switch.

3.4.103.6

C1 load switch classC1switch Validated by specific type tests (test methods Icc, Ilc, Isb, and Ibb) with low weight breakdown during capacitive current breaking Probability load switch.

3.4.103.7

C2 load switch classC2switch Validated by specific type tests (test methods Icc, Ilc, Isb, and Ibb) with very low weight during capacitive current breaking Break switch with probability of breakdown.

3.4.104

Dedicated load switch limitedpurposeswitch Load with rated current, rated short-time withstand current, and one or more but not all of the universal load switches switch.

3.4.105

Special purpose load switch specialpurposeswitch Universal load switch or special load switch for one or more of the following applications.

--- Opening and closing a single capacitor bank;

---Open and close the back-to-back capacitor bank;

---Opening the motor under steady state and locked conditions;

--- Opening and closing closed loop circuit consisting of parallel large-capacity power transformers.

3.4.105.1

Single capacitor bank load switch singlecapacitorbankswitch Special purpose load switch for opening and closing charging current, the charging current value of opening and closing is up to its rated single capacitor group breaking Current.

3.4.105.2

Back-to-back capacitor bank load switch back-to-backcapacitorbankswitch the power supply for the breaking load switch is connected to one or more capacitor banks, and the charging current is until its rated back-to-back capacitor bank is turned on.

Special purpose load switch for interrupted current capacitor banks. The load switch should be able to close until its rated capacitor bank is connected to the inrush current Inrush.

3.4.105.3

Motor load switch motorswitch Special purpose load switch for opening and closing motors in steady state and stall conditions.

3.4.105.4

Parallel power transformer closed-loop load switch paralelpowertransformerclosed-loopswitch A special purpose load switch for opening and closing a closed loop formed by a parallel large-capacity power transformer.

Note. This type of load switch is typically used as a medium voltage contact load switch for the secondary side of the transformer, so the breaking current is high and the transient recovery voltage (TRV) the conditions are harsh.

3.5 Switching equipment and components of control equipment

Applicable to 3.5 of GB/T 11022-2011.

3.6 Operation

3.6 of GB/T 11022-2011 is applicable.

3.7 Characteristic parameters

3.7 of GB/T 11022-2011 is applicable and supplemented as follows.

3.7.101

Breaking capacity the expected current value at which the switching device or fuse can be turned off under specified operating and operating conditions and a specified voltage.

Note 1. The specified voltage and specified conditions are covered in the relevant standards.

Note 2. For the switching device, the breaking capacity can be defined according to the type of current included in the specified conditions, such as. line charging breaking capacity, cable charging Electrical breaking capacity, breaking capacity of a...