Home Cart Quotation About-Us
www.ChineseStandard.net
SEARCH

GB/T 50064-2014 English PDF

Q: How long will the true-PDF of English version of GB/T 50064-2014 be delivered?

Upon your order, we will start to translate GB/T 50064-2014_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Q: Can I share the purchased PDF of GB/T 50064-2014_English with my colleagues?

Yes. The purchased PDF of GB/T 50064-2014_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Q: Does the price include tax/VAT?

Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries). Avoidance of Double Taxation Agreements (DTAs) between Singapore and 100+ Countries: https://www.iras.gov.sg/taxes/international-tax

Q: Do you accept my currency other than USD?

Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 50064-2014	RFQ	ASK	3 days	Code for design of overvoltage protection and insulation coordination for AC electrical installations	Valid

Similar standards

DL/T 5155 DL/T 5218 DL/T 5056 GB 50059 GB 50061 GB/T 50062

Basic data

Standard ID: GB/T 50064-2014 (GB/T50064-2014)
Description (Translated English): Code for design of overvoltage protection and insulation coordination for AC electrical installations
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: P62
Classification of International Standard: 29.240.01
Word Count Estimation: 145,194
Date of Issue: 3/31/2014
Date of Implementation: 12/1/2014
Older Standard (superseded by this standard): GBJ 64-1983
Quoted Standard: GB 311.1
Regulation (derived from): Ministry of Housing and Urban-Rural Development Bulletin No. 362
Issuing agency(ies): Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Summary: This standard applies to the nominal AC voltage 6kV ~ 750kV power system generation, transmission, substation, distribution of electrical equipment and rotating motor over-voltage protection and insulation coordination design.

GB/T 50064-2014: Code for design of overvoltage protection and insulation coordination for AC electrical installations

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
1 General 1.0.1 This specification is formulated to make the overvoltage protection and insulation coordination design of AC electrical installations safe, reliable, advanced in technology, and economical and reasonable. 1.0.2 This specification is applicable to the overvoltage protection and insulation coordination design of electrical installations for power generation, transmission, transformation and distribution, and rotating electrical machines in power systems with AC nominal voltages of 6kV to 750kV. 1.0.3 The overvoltage protection and insulation coordination of AC electrical installations should be designed in a differentiated manner through calculation analysis and technical and economic comparison in combination with the grid structure, regional lightning activity characteristics, ground flash density and operating experience. 1.0.4 The design of overvoltage protection and insulation coordination of AC electrical installations shall not only comply with this specification, but also comply with the relevant current national standards. 2 terms 2.0.1 High-resistance neutral ground-ing method of neutral point At least one wire or one point in the system is grounded with high resistance, the equivalent zero-sequence resistance of the system is not greater than the distributed capacitive reactance of the single-phase ground of the system, and the grounding fault current of the system is less than 10A. 2.0.2 Low-resistance neutral ground-ing method of neutral point At least one conductor or point in the system is grounded with low resistance, and the equivalent zero-sequence resistance of the system is not less than twice the equivalent zero-sequence inductive reactance of the system. 2.0.3 Resonant neutral grounding method of neutral point resonance At least one conductor or point in the system is grounded through inductance, which is used to compensate the capacitive component of the system's single-phase-to-ground fault current. 2.0.4 Very fast transient overvoltage (VFTO) Gas-insulated metal-enclosed switchgear (GIS) and composite electrical appliances (HGIS, namely Hybrid-GIS) disconnectors generate high-frequency oscillation overvoltages with a frequency of hundreds of thousands of hertz to several megahertz in certain operating modes, called Very fast transient overvoltage. 2.0.5 ground flash density (GFD) The number of lightning strikes on the ground per square kilometer and per year. 2.0.6 less minefield less thunderstorm region Areas where the average annual number of thunderstorm days does not exceed 15 days or the ground lightning density does not exceed 0.78 times/(km2·a). 2.0.7 middle thunderstorm region Areas where the average annual number of thunderstorm days exceeds 15 days but not more than 40 days or the density of ground lightning strikes exceeds 0.78 times/(km2·a) but not more than 2.78 times/(km2·a). 2.0.8 more thunderstorm region more thunderstorm region Areas where the average annual number of thunderstorm days exceeds 40 days but not more than 90 days or the density of ground lightning strikes exceeds 2.78 times/(km2·a) but not more than 7.98 times/(km2·a). 2.0.9 strong thunderstorm region Areas where the average annual number of thunderstorm days exceeds 90 days or the ground lightning density exceeds 7.98 times/(km2·a), and areas where lightning damage is particularly severe according to operating experience. 2.0.10 shielding angle The protection angle of the ground wire to the conductor refers to the angle between the vertical line of the ground wire to the horizontal plane and the connection between the ground wire and the wire or the outermost sub-wire of the split wire at the tower, regardless of the wind deflection.

3 System neutral point grounding method and voltage acting on electrical device insulation

3.1 System neutral point grounding method 3.1.1 The effective grounding method of the neutral point shall meet the following requirements. 1 The neutral point of 110kV～750kV system should adopt effective grounding method. Under various conditions, the ratio of zero-sequence to positive-sequence reactance (X0/X1) of the system should be positive and should not be greater than 3, while the ratio of zero-sequence resistance to positive-sequence reactance (R0/X1) should not be greater than 1 ; 2 In 110kV and 220kV systems, the neutral point of the transformer can be directly grounded; the neutral point of some transformers can also be ungrounded; 3 The neutral point of the 330kV～750kV system transformer should be directly grounded or grounded through low impedance. 3.1.2 Non-effective neutral point grounding methods can be divided into neutral point non-grounding method, neutral point low resistance grounding method, neutral point high resistance grounding method and neutral point resonance grounding method. 3.1.3 The neutral point ungrounded method shall comply with the following regulations. 1 For 35kV and 66kV systems and the 6kV to 20kV systems that are not directly connected to the generator, and are composed of reinforced concrete poles or metal pole tower overhead lines, when the single-phase ground fault capacitor current is not greater than 10A, the neutral point ungrounded method can be used; When it is greater than 10A and needs to operate under ground fault conditions, the neutral point resonance grounding method should be adopted. 2 For the 6kV ~ 20kV system that is not directly connected to the generator and is composed of cable lines, when the single-phase ground fault capacitive current is not greater than 10A, the neutral point ungrounded method can be used; when it is greater than 10A and needs to be operated under ground fault conditions, It is advisable to adopt the neutral point resonance grounding method. 3 For a system with a rated generator voltage of 6.3kV and above, when a single-phase ground fault occurs inside the generator and does not require instantaneous shutdown, the maximum allowable value of the capacitor current for a single-phase ground fault of the generator when the neutral point is not grounded should be in accordance with the table 3.1.3 Determine; when it is greater than this value, the neutral point resonance grounding method should be adopted, and the arc suppression device can be installed on the neutral point of the factory transformer or the neutral point of the generator. Table 3.1.3 Maximum allowable value of capacitive current for generator single-phase ground fault Note. * For hydrogen-cooled generators with a rated voltage of 13.80kV ~ 15.75kV, the allowable current value is 2.5A. 4 For systems with a generator rated voltage of 6.3kV and above, when a single-phase ground fault occurs inside the generator and requires instantaneous shutdown, the neutral point resistance grounding method should be adopted, and the resistor can be connected to the secondary of the generator neutral point transformer. on the winding. 3.1.4 6kV ~ 35kV power distribution system mainly composed of cable lines, power plant power system, wind farm power collection system and mine removal industrial enterprise power supply system, when the single-phase ground fault capacitor current is large, it may Use the neutral point low resistance grounding method. The resistance of the neutral point resistor of the transformer should be selected with a larger value under the premise of satisfying the reliability of single-phase grounding relay protection and overvoltage insulation coordination. 3.1.5 For 6kV and 10kV power distribution systems and power plant power systems, when the single-phase ground fault capacitive current is not greater than 7A, the neutral point high resistance grounding method can be used, and the total fault current should not exceed 10A. 3.1.6 When the 6kV～66kV system adopts the neutral point resonant grounding method, the following requirements shall be met. 1 Resonance grounding should adopt arc suppression device with automatic tracking compensation function; 2.During normal operation, the automatic tracking compensation arc suppression device should ensure that the long-term voltage displacement of the neutral point does not exceed 15% of the system's nominal phase voltage; 3 When the automatic tracking compensation arc suppression device is used, the residual current of the system ground fault should not be greater than 10A; 4 The capacity of the arc-suppression part of the automatic tracking compensation arc-suppression device shall be determined according to the development plan of the system's vision year, and shall be calculated according to the following formula. In the formula. W——the capacity of the arc suppression part of the automatic tracking and compensation arc suppression device (kV·A); Ic——ground capacitance current (A); Un—system nominal voltage (kV). 5 The installation location of the automatic tracking compensation arc suppression device shall meet the following requirements. 1) In any operation mode of the system, when the primary and secondary circuits are disconnected, the compensation shall not be lost; 2) Multiple sets of automatic tracking compensation arc suppression devices should not be installed in the same position in the system. 6 The arc-suppression part installed by the automatic tracking compensation arc-suppression device shall meet the following requirements. 1) The arc suppression part should be connected to the neutral point of the transformer with YN, d or YN, yn, d connection, or it can be connected to the neutral point of the transformer with ZN, yn connection, and should not be connected to the zero-sequence magnetic flux through the iron core Closed circuit YN, yn connection transformer; 2) When the arc suppression part is connected to the neutral point of the double-winding transformer with YN and d connections, the capacity of the arc suppression part should not exceed 50% of the total three-phase capacity of the transformer; 3) When the arc suppression part is connected to the neutral point of the three-winding transformer with YN, yn, and d connections, the capacity of the arc suppression part should not exceed 50% of the total three-phase capacity of the transformer, and should not be greater than that of any winding of the three-winding transformer capacity; 4) When the arc suppression part is connected to the neutral point of the YN and yn connection transformer with zero-sequence magnetic flux without iron core closed circuit, the capacity of the arc suppression part should not exceed 20% of the total three-phase capacity of the transformer. 7 When the power transformer has no neutral point or the neutral point is not led out, a special grounding transformer should be installed to connect the automatic tracking compensation arc suppression device, and the capacity of the grounding transformer should match the capacity of the arc suppression part. For new substations, the grounding transformer can also be used as a station transformer according to the needs of the station's power consumption. 3.2 Voltage acting on the insulation of electrical installations 3.2.1 The voltages acting on the insulation of AC electrical installations are. 1 Continuous operating voltage, whose value does not exceed the maximum voltage of the system, and whose duration is equal to the design life of the equipment; 2 Temporary overvoltage, including power frequency overvoltage and resonance overvoltage; 3 operating overvoltage; 4 Lightning overvoltage; 5 Very fast transient overvoltage (VFTO). 3.2.2 The reference voltage of the phase-to-earth temporary overvoltage and operating overvoltage per unit shall meet the following requirements. 1 When the highest effective voltage of the system is Um, the reference voltage (1.0pu) of power frequency overvoltage should be Um/; 2 The reference voltage (1.0pu) of resonance overvoltage, operating overvoltage and VFTO should be Um/. 3.2.3 The range of maximum system voltage in this specification is divided into the following two categories. 1 Scope I, 7.2kV≤Um≤252kV; 2 Range II, 252kV< Um≤800kV. 4 Temporary overvoltage, operating overvoltage and limitation 4.1 Temporary overvoltage and limitation 4.1.1 The power frequency overvoltage amplitude should meet the following requirements. 1 The power frequency overvoltage of the ungrounded system in scope I should not be greater than 1.1pu; 2 The power frequency overvoltage of the neutral point resonant grounding, low resistance grounding and high resistance grounding systems should not be greater than Pu; 3 For 110kV and 220kV systems, the power frequency overvoltage should not be greater than 1.3pu; 4.The power frequency overvoltage of the 35kV and 66kV shunt capacitor compensation device system with ungrounded neutral point in the substation should not exceed pu. 1) When the no-load line is closed by the isolated power supply, the voltage along the line after the line is closed should not exceed the maximum voltage of the system; 2) The unloaded line is closed by the substation connected to the system, and the voltage along the line after the line is closed should not exceed the maximum voltage of the system. 3 For scope II double-circuit lines on the same tower, the single-phase reclosing overvoltage after the single-phase ground fault of the primary line should be taken as the main working condition. 4 Scope II The relative ground statistical overvoltage generated by closing and reclosing of no-load lines should not be greater than 2.2pu, 2.0pu and 1.8pu for 330kV, 500kV and 750kV systems respectively. 5 Scope II The main limiting measures for overvoltage of no-load line closing and single-phase reclosing should be the use of closing resistors and installation of MOA for circuit breakers, and phase-selection closing measures can also be used. Restrictive measures should meet the following requirements. 1) For 330kV and 500kV lines in scope II, it is advisable to pass verification according to project conditions to determine the feasibility of only using MOA to limit closing and reclosing overvoltages; 2) In order to limit this kind of overvoltage, MOA can also be installed at an appropriate position on the line. 6 When the line in scope I requires deep reduction of closing or reclosing overvoltage, restrictive measures can be taken. 4.2.2 Fault clearing overvoltage and limitation shall meet the following requirements. 1 The design conditions of the project should be the overvoltage generated on the faulty line or adjacent lines after the single-phase fault grounding fault of the line is cleared; 2 For two-phase short-circuit, two-phase or three-phase ground faults, corresponding restrictive measures can be taken according to the prediction results; 3 For the higher fault clearing overvoltage on the line, MOA can be installed in the middle of the line or an opening resistor can be installed on the circuit breaker to limit it. 4.2.3 No fault load dump overvoltage can be limited by MOA. 4.2.4 The overvoltage under oscillating deloading operation should be predicted. When predicting oscillation splitting overvoltage, the potential power angle difference at the sending and receiving ends of the line should be selected according to the serious working conditions of the system. 4.2.5 The operating overvoltage generated by switching no-load transformers can be limited by MOA. 4.2.6 When the no-load line is disconnected, the limiting measures for the no-load line opening overvoltage caused by the heavy breakdown of the circuit breaker shall meet the following requirements. 1 For 110kV and 220kV systems, a circuit breaker with a very low probability of restrike should be used for breaking no-load overhead lines, and a circuit breaker with a very low probability of restrike should be used for disconnecting cable lines, and the overvoltage should not be greater than 3.0pu. 2 For 66kV and below ungrounded systems or resonant grounded systems, circuit breakers with extremely low re-strike probability should be used to break no-load lines. For low-resistance grounding systems of 6kV to 35kV, a circuit breaker with a very low probability of heavy breakdown should be used to break the no-load line. 4.2.7 In the 6kV～66kV system, the circuit breaker with extremely low probability of re-strike should be used for breaking the shunt capacitor compensation device. To limit single-phase heavy strike through voltage, the MOA protection (Figure 4.2.7) of the shunt capacitor compensation device should be used as backup protection. The two-phase heavy breakdown of the circuit breaker may not be considered as the working condition of the design. Figure 4.2.7 MOA protection of shunt capacitor compensation device 1-circuit breaker; 2-series reactor; 3-capacitor bank; 4-MOA 4.2.8 When breaking the shunt reactor, it is advisable to use a circuit breaker with a lower cut-off value, and it is advisable to use an MOA or an RC resistance-capacity absorption device with extremely low energy consumption as a backup protection to limit the overvoltage caused by the forced arc extinguishing and cut-off of the circuit breaker. When breaking the shunt reactor of range II, the phase selection opening device can also be used. 4.2.9 When a vacuum circuit breaker or an oil-less circuit breaker with a high cut-off value is used to switch off the high-voltage induction motor, it is advisable to install an MOA for the rotating motor or an RC resistance-capacity absorber with extremely low energy consumption between the circuit breaker and the motor. device. 4.2.10 For the overvoltage generated when a single-phase intermittent arc-ground fault occurs in an ungrounded system of 66kV or below, the necessary prediction can be made according to the nature of the load and the importance of the project. 4.2.11 In order to monitor the temporary overvoltage and operating overvoltage during the operation of the scope II system, it is advisable to install a device that automatically records the overvoltage waveform or amplitude in the substation, and it is advisable to collect the measured results regularly. 4.3 VFTO and limitations 4.3.1 Scope II GIS and HGIS substations should predict the VFTO generated by the disconnector opening and closing pipeline. When VFTO will damage the insulation, it is advisable to avoid dangerous operation methods or install damping resistors in the isolation switch. 4.4 Basic requirements for MOA used to limit operating overvoltage 4.4.1 The continuous operating voltage of the phase-to-earth MOA for protection of electrical installations should not be lower than the highest phase voltage of the system. The continuous operating voltage of the neutral point MOA of the transformer and shunt reactor should be determined according to the rated voltage and the appropriate charging rate. 4.4.2 The rated voltage of MOA for electrical installation protection can be selected according to formula (4.4.2-1) or formula (4.4.2-2), and the parameters should be determined according to the amplitude and duration of temporary overvoltage of the system and the value of MOA Power frequency voltage withstand time characteristics. For effectively grounded and low-resistance grounded systems, when the ground fault clearing time is not greater than 10s, the rated voltage of MOA can be selected according to formula (4.4.2-1); for non-effectively grounded systems, when the ground fault clearing time is greater than 10s, the rated voltage of MOA It can be......

Image

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 50064-2014_English be delivered?

Answer: Upon your order, we will start to translate GB/T 50064-2014_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 50064-2014_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 50064-2014_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.