NB/T 10303-2019 English PDFUS$329.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. NB/T 10303-2019: (Overheat and overcurrent protector for motor) Status: Valid
Basic dataStandard ID: NB/T 10303-2019 (NB/T10303-2019)Description (Translated English): (Overheat and overcurrent protector for motor) Sector / Industry: Energy Industry Standard (Recommended) Classification of Chinese Standard: K32 Classification of International Standard: 97.120 Word Count Estimation: 14,147 Date of Issue: 2019-11-04 Date of Implementation: 2020-05-01 Issuing agency(ies): National Energy Administration NB/T 10303-2019: (Overheat and overcurrent protector for motor)---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.Overheating and overcurrent protection for motors ICS 97.120 K 32 NB Energy Industry Standards of the People's Republic of China Motor overheat and overcurrent protector 2019-11-04 released 2020-05-01 implementation Issued by National Energy Administration ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard was proposed by China Electrical Equipment Industry Association. This standard is under the jurisdiction of the National Standardization Technical Committee for Household Automatic Controllers (SAC/TC212). Drafting organizations of this standard. Yangzhou Wuyue Electric Co., Ltd., China National Electrical Equipment Research Institute Co., Ltd., Hefei Midea Refrigerator Co., Ltd. Company, Yangzhou Baozhu Electric Co., Ltd., Xiamen Rituo Electric Technology Co., Ltd., Baoying Electric Factory, Foshan Quality and Standardization Research Institute, Jiangsu Changsheng Electric Co., Ltd., Xi'an Yuntuo Electric Co., Ltd., Weikai Testing Technology Co., Ltd., Hangzhou Xingshuaier Electric Co., Ltd. have Co., Ltd., Changzhou Flander Electric Co., Ltd., Guangzhou Senbao Electric Co., Ltd., Yidu Botong Electronics Co., Ltd., Foshan Lianda Electric Co., Ltd., Lanxi Yueqiang Electric Co., Ltd., Ningbo Ouzhi Electric Technology Co., Ltd., Jinhua Wangyuan Electronic Technology Co., Ltd. Co., Ltd., Xi'an Zhiheng Electrical Technology Co., Ltd., Ningbo Catmark Smart Kitchenware Co., Ltd. The main drafters of this standard. Wu Weiguo, Kong Ruixun, Chen Lin, Cao Shiliang, Yang Fenglei, Liu Jinhua, Xu Shiping, Zhuo Yun, Cheng Mingsheng, Zhang Wenjie, Jing Yixin, Lu Wencheng, Du Li, Zeng Qingyi, Wei Bing, Guo Qiqiang, Wang Jian, Ke Cilong, Zhang Wei, Hu Xiaobing, Xu Hongwei. Motor overheat and overcurrent protector1 ScopeThis standard specifies the terminology, model designation, technical requirements, and test methods of overheating and overcurrent protectors for electric motors (hereinafter referred to as protectors) Laws, inspection rules and signs, packaging, transportation and storage, etc. This standard applies to protectors with a frequency of 50 Hz or 60 Hz, a rated voltage not exceeding 250 VAC, and a rated current not exceeding 30 A.2 Normative referencesThe following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document. GB/T 2423.3-2016 Environmental Test Part 2.Test Method Test Cab. Constant Damp Heat Test GB/T 2828.1-2012 Sampling inspection procedures by attributes Part 1.Batch inspection sampling plan retrieved by acceptance quality limit (AQL) GB/T 14536.1-2008 Household and similar electric automatic controllers Part 1.General requirements3 Terms and definitionsThe following terms and definitions apply to this document. 3.1 Overheating and overcurrent protection for motors A protection device installed on the motor to prevent overheating and overcurrent caused by motor overload operation or starting failure. Note. This device carries the current of the motor and is sensitive to the current and/or temperature of the motor. 3.2 Operating temperature The protector does not carry any current, or only the signal current passes through, and the cut-off temperature value measured under a certain heating rate condition. 3.3 Reset temperature After the temperature rise causes the circuit to be opened, the protector is the closed temperature value measured at a certain cooling rate. 3.4 Rated current The manufacturer specifies the maximum non-operation current that the protector is allowed to carry for a long time under the specified ambient temperature. 3.5 Rated trip current rated trip current The current at which the protector operates at the specified ambient temperature and within the specified time. 3.6 Rated trip time Under the specified ambient temperature, the protector is passed the rated trip current, and the time it takes to open the circuit. 3.7 Reset time Under the specified ambient temperature, the time from when the protector is opened for the first time with the rated tripping current to open the circuit to the circuit automatically. 3.8 Current-temperature characteristics In the set ambient temperature, the protector does not disconnect the maximum continuous current that the circuit can carry.4 Product model naming4.1 Product Type The protector is divided into automatic reset type and non-automatic reset type according to the reset method. The non-automatic reset type is divided into manual button reset type and PTC voltage hold type according to the structure. 4.2 Model naming The model naming rules of the protector are in accordance with the following rules. 4.3 Basic parameters The basic parameters of the protector are shown in Table 1.5 Technical requirements5.1 General requirements 5.1.1 The mark of the protector should be clear, and the content of the mark and installation dimensions should meet the requirements of the manufacturer's relevant documents. 5.1.2 The metal parts of the protector shall not have cracks and peeling off the coating. 5.1.3 The insulating material shall not have bubbles, cracks, obvious spots and damage. 5.1.4 Where there are regulations on the installation method or the performance of the protector is affected by the installation conditions (such as product polarity), it should be stated in the product technical file. Confirm the installation conditions or indicate that the user should negotiate with the manufacturer to determine the installation conditions. 5.1.5 The structure of the lead-out components should be able to ensure good electrical contact and current-carrying capacity, and be able to withstand corresponding mechanical stress. Determined by agreement between the supplier and the user. 5.1.6 After the protector of the non-automatic reset mechanism operates under normal working conditions, when it is cooled to the operating temperature, if it is not manually operated, The automatic reset operation should not reset itself. 5.1.7 The insulating material of the protector shall be able to withstand the following requirements for heat resistance, flame resistance and tracking resistance. a) Heat resistance. the ball pressure test of the maximum working environment temperature of the thermal protector Tmax＋40℃; Note. Ceramic materials do not do this test. b) Flame resistance. test temperature test at the top of the glow wire at 750℃±10℃, duration 30s±1s; c) Tracking resistance. PTI is not less than 175 V. 5.2 Electrical and performance requirements 5.2.1 Temperature characteristics 5.2.1.1 The operating temperature range is from 50°C to 180°C, and the label value is set every 5°C. The tolerance can be selected as ±5°C and ±7°C. 5.2.1.2 The reset temperature shall meet the following requirements. a) For the automatic reset protector whose reset temperature is 35% lower than the action temperature, its tolerance can be selected as ±10℃, ±15℃; b) The non-automatic reset protector shall not reset itself under the environment of -5℃. Note 1.Other operating temperature and reset temperature and their tolerances can be set separately according to user requirements. Note 2.The reset temperature limit of the non-automatic reset protector can be set lower according to customer requirements. 5.2.2 Current-temperature characteristics The protector manufacturer shall reflect the current-temperature characteristics of the thermal protector in the form of a chart or curve, and its requirements shall be confirmed by agreement with the user. set. 5.2.3 Current protection characteristics 5.2.3.1 Rated tripping time. at an ambient temperature of 25℃, the product is supplied with rated tripping current, and the action time of the protector is 4 s to 10 s. 5.2.3.2 Reset time. at 25°C ambient temperature, the reset time of the protector is 5 s ~ 30 s. Note. Other rated trip time and reset time can also be set according to user requirements. 5.2.4 Insulation resistance The insulation resistance of the protector should meet the following requirements. a) When the contacts of the automatic reset protector and manual button reset protector are disconnected, the insulation resistance between the two lead wires or terminals should be Not less than 5 MΩ; Note. The protector with PTC device is not applicable to this requirement. b) The insulation resistance between the lead wire or terminal of the protector and the surface of the insulating layer of the housing should not be less than 100 MΩ. 5.2.5 Electric strength Apply the following basic sine wave test voltage with a frequency of 50 Hz between the following parts of the overheat and overcurrent protector. a) When the silver contact is disconnected, between the two lead wires. 500 V; Note. The protector with PTC device is not applicable to this requirement. b) In the normally closed state of the silver contact, between the lead wire and the insulating part. 1 500 V. The test voltage lasts for 1 min, and there should be no flashover or breakdown during the test. 5.2.6 Durability 5.2.6.1 The automatic reset protector shall be able to withstand the conditions of AC 50Hz, product rated voltage, and power factor cosФ of 0.75～0.8 It is subjected to a 2,000-cycle test with rated trip current. 5.2.6.2 The non-auto-reset protector can be used under the conditions of AC 50Hz, product rated voltage, and power factor cosФ of 0.75～0.8 Withstand 60 cycles of rated trip current test. 5.2.6.3 After the test of 5.2.6.1 or 5.2.6.2, the change in the operating temperature of the protector shall not exceed ±5% or ±5 ℃ of the initial value. Choose between the two Larger value, its temperature characteristics meet the requirements of 5.2.1, insulation resistance meets the requirements of 5.2.4, and electrical strength meets the requirements of 5.2.5. 5.2.7 Ultimate short circuit performance The thermal protector should be able to withstand the limit short-circuit performance test of the expected current in Table 2 without causing a fire hazard. Note. The expected current is the symmetrical root-mean-square current value flowing through the circuit when the protector is not connected to the circuit and the power factor is 0.9 to 1.0. 5.2.8 High temperature resistance The protector should be able to withstand a 96h high temperature test with an action temperature plus 30 ℃ but no lower than 155 ℃. The protector will move after the test. The change in operating temperature should not exceed ±5% or ±5 ℃ of the initial value, whichever is greater, the insulation resistance meets the requirements of 5.2.4, and the electrical strength Meet the requirements of 5.2.5. 5.2.9 Resistance to temperature changes The protector should be able to withstand temperature changes of 80 ℃, duration 6 h and low temperature -40 ℃, duration 6 h as a cycle. Cycle 10 times, and the change of the operating temperature after the test does not exceed ±5% or ±5 ℃ of the initial value, whichever is greater. 5.2.10 Humidity and heat resistance The protector should be able to withstand the severity level according to the temperature of 40 ℃ ± 2 ℃ in GB/T 2423.3-2016, and the relative humidity is 93% ± 3%. The insulation resistance between the lead wire or terminal and the surface of the housing insulation layer after the test should be not less than 5 MΩ, and can withstand 5.2.5 Electric strength test at 80% of the specified voltage. 5.2.11 Vibration resistance The protector should be able to withstand the vibration frequency. 10 Hz～150 Hz, the frequency sweep rate is 10 ct/min, and the vibration amplitude. 0.35 mm under the conditions of X, Y The number of continuous frequency sweep cycles in the three directions of Z and Z is 10 cycles, and the change of the operating temperature after the test does not exceed ±5% or ±5℃ of the initial value, both Choose a larger value. 5.2.12 Impact resistance The protector should be able to withstand the peak acceleration of 50 gn ± 7.5 gn and the pulse duration of 11 ms ± 1 ms after peak sawtooth half sine wave plus Speed impact test, after the test, the change in operating temperature does not exceed the initial value ±5% or ±5℃, whichever is greater.6 Test method6.1 Test conditions Unless otherwise specified, the test should be carried out under the following conditions. a) The ambient temperature is 10 ℃ ~ 30 ℃, and the ambient air temperature change during the test should not exceed 10 ℃; b) The accuracy of test instruments and meters. the factory inspection is not less than 1.0, and the type test is not less than 0.5; c) Humidity requirements. relative humidity 45%-85%; d) Accuracy of temperature measuring instrument. the factory inspection error does not exceed 0.5 ℃, and the type test does not exceed 0.2 ℃; e) The temperature change in the temperature measurement area of the temperature detection box is within 1 K. 6.2 General requirements check 6.2.1 General requirements check Through visual inspection of appearance, installation method, structure of lead-out parts, protector of non-automatic reset mechanism, check with general or special measuring tool Check the size to determine whether the result meets the requirements of 5.1.1 to 5.1.6. 6.2.2 Heat resistance, flame resistance and tracking resistance test of insulating parts According to the requirements of 5.1.7 heat resistance, flame resistance and tracking resistance of insulating parts and the method specified in Chapter 21 of GB/T 14536.1-2008 Perform tests to determine whether the results meet the requirements of 5.1.7. Note. When necessary, use plastic samples to conduct heat resistance, flame resistance and tracking resistance tests of insulating parts. 6.3 Electrical and performance test 6.3.1 Action temperature test Place the protector in a test box for testing, and the air flow rate of the test box is not less than 3 m/s. The measurement method adopts thermocouple or thermometer. The thermocouple or thermometer should be placed on the protector sample or as close as possible to the protector. In the test, the air temperature is increased. When the air temperature is about 10 K below the lower limit temperature of the cut-off temperature, the temperature change rate shall not exceed 1K/min to protector action, determine whether the result meets the requirements of 5.2.1.1. Use indicator lights or other methods to indicate the on-off status, and the current through the protector should not exceed 0.1 A. 6.3.2 Reset temperature test For the automatic reset protector, use the method specified in 6.3.1 to carry out the reset temperature test, reduce the air temperature, When the temperature upper limit temperature is 10 K, keep the temperature change rate not exceeding 1 K/min until the protector is reset, and determine whether the result meets the requirements of 5.2.1.2 begging. For the manual button reset protector, after the product is operated, it is placed in an environment of -5°C for 30 minutes, and the protector cannot reset itself. The circuit can be connected after manual reset. For the PTC voltage holding type protector, the rated voltage is passed, and the product is placed in an environment of -5°C for 30 minutes after operation, and the protection The device must not reset itself. 6.3.3 Current-temperature characteristic test Place the protector in a relatively still air with a temperature fluctuation of less than ±2°C for testing. In the test, keep the ambient temperature at any temperature point lower than the cut-off temperature, and pass the non-operating voltage of the protector at this temperature Flow for 1h to determine whether the structure meets the requirements of 5.2.2. 6.3.4 Current protection characteristic test After the protector is placed in an environment of 25 ℃ ± 3 ℃ for 30 minutes, the rated trip current is applied to check whether the protection characteristics of the protector are Meet the requirements of 5.2.3. 6.3.5 Insulation resistance test Use a 500 VDC megger or insulation resistance measuring instrument to measure the insulation resistance of the protector according to the following method, and check whether the result meets the requirements of 5.2.4 Claim. For the insulation resistance performance test between the protector contacts, the thermal protector should be placed in air approximately 10K higher than the upper limit temperature of the disconnect temperature of the test product In the medium, it is carried out with the contacts disconnected. The insulation resistance performance test between the lead-out part of the protector and the insulating surface layer of the enclosure is performed at room temperature. 6.3.6 Electric strength test Electric strength performance test, the test power capacity is not less than 0.5kVA, the frequency is 50Hz, the leakage current is set to 10mA, in 5.2.5 When the test voltage (AC effective value) is applied to the stated part, it starts from half of the test voltage and rises rapidly to the full value for 1 min Check for breakdown or flashover. In the electrical strength performance test between the two contacts, the thermal protector should be placed in the air about 10K higher than the upper limit temperature of the rated breaking temperature of the sample In the medium, it is carried out with the contacts disconnected. Note 1.The electrical strength performance test between the lead wire or terminal and the outer surface of the insulator is carried out at room temperature. Note 2.During the manufacturing process of the protector, it is allowed to use a short-term alternative test method that increases the test voltage by 20% and shortens the test time to 1 s for electrical strength testing. Test. 6.3.7 Durability test 6.3.7.1 The automatic reset protector product is connected to the circuit with the rated voltage and power factor of 0.75 to 0.8, and the rated tripping current is passed through. The flow tolerance is ±5%, the operating frequency (on-off-on time) is not less than 13min, and the cycle rate depends on the surrounding air medium. Quality temperature, after this cycle.2000 times, check whether the result meets the requirements of 5.2.6. 6.3.7.2 The non-auto-reset protector is connected to the circuit with the product's rated voltage and power factor of 0.75 to 0.8, and the rated trip current is passed. The current tolerance is ±5%, and it should be reset as soon as possible after each trip. Repeat this way 60 times to check whether the result meets the requirements of 5.2.6. 6.3.8 Limit short circuit performance test Connect the protector and the fast-fuse body in series, wrap the shell of the protector with absorbent cotton wool, and then connect to the expected current and power specified in 5.2.7 In a circuit with a cosФ of 0.9～1.0, the thermal protector is allowed to operate repeatedly during the test, and the test should be carried out until the protector is permanently disconnected. Until the circuit or fuse is blown, the contact of the protector is allowed to be welded or broken, and it is judged whether it meets the requirements of 5.2.7. The fuse is selected according to the following principles. --The voltage is 150V and below, and the rated current of the fuse link should not be less than 20A. --The voltage is higher than 150V......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of NB/T 10303-2019_English be delivered?Answer: Upon your order, we will start to translate NB/T 10303-2019_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 NB/T 10303-2019_English with my colleagues?Answer: Yes. The purchased PDF of NB/T 10303-2019_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. 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