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MT 189-1988 English PDF

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MT 189-1988: Flameproof leak hunting relays intended to be used in mines
Status: Obsolete
Standard IDUSDBUY PDFLead-DaysStandard Title (Description)Status
MT 189-1988519 Add to Cart 3 days Flameproof leak hunting relays intended to be used in mines Obsolete

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Basic data

Standard ID: MT 189-1988 (MT189-1988)
Description (Translated English): Flameproof leak hunting relays intended to be used in mines
Sector / Industry: Coal Industry Standard
Classification of Chinese Standard: K35
Word Count Estimation: 13,190
Date of Issue: 4/3/1988
Date of Implementation: 7/1/1988
Summary: This standard specifies the flameproof Leak relay (hereinafter referred to as the relay) terms, product classification, model preparation, basic parameters, technical requirements, test methods, inspection rules, marking, packaging, transport and storage boxes. This standard applies to the relay. Relay for Shan have mine fried mixture of sex, in AC 50Hz, rated voltage 1140V and below, the three-phase neutral point directly grounded insulated power supply network, and with the low-pressure feed switch for leakage protection and leakage blocking purposes, to prevent shock to humans due to the insulation of electrical equipment and network risk of electric shock and prevent damage caused by the insulation low power transmission network.

MT18:

---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.
Flameproof leak hunting relays intended to be used in mines Ministry of Coal Industry Standards MT/T 189-88 Mine flame-proof leak detection relay 1988-04-03 ratified 1988-07-01 implemented Approved by the Ministry of Coal Industry of the People's Republic of China

Contents

1 Topic content and scope of application 1 2 Normative references 1 3 Terminology 1 4 Product classification, model establishment and basic parameters 2 6 Test method 7 7 Inspection rules 9 8 Marking, packaging, transport and storage 10 Mine flame-proof leak detection relay

1 Topic content and scope

This standard specifies the terminology, product classification, model designation, basic parameters, technology Technical requirements, test methods, inspection rules, signs, packaging, transportation and storage. This standard applies to relays. The relay is used in mines with explosive mixtures, at AC 50Hz, rated voltage 1140V and below In the insulated power supply network where the three-phase neutral point is not directly grounded, the low-voltage feed switch is used for leakage protection and leakage blocking to prevent Danger of electric shock due to insulation damage to human body electric shock and network electrical equipment and prevent power transmission to networks with low insulation.

2 Reference standards

GB 3836.1 General requirements for explosion-proof electrical equipment for explosive environments GB 3836.2 Explosion-proof electrical equipment for explosive atmospheres Flameproof electrical equipment "d" GB 3836.3 Explosion-proof electrical equipment for explosive environments Increased safety electrical equipment "e" GB 3836.4 Explosion-proof electrical equipment for explosive environments Intrinsically safe circuits and electrical equipment "i" GB 1497 Basic Standard for Low Voltage Electrical Apparatus GB 998 Basic test methods for low-voltage electrical appliances GB 2900.1 electrical terminology basic terminology GB 2900.18 Terms of electrical terms GB 2900.35 Glossary of electrical terms Explosion-proof electrical equipment for explosive environments GB 4942.2 Protection level for low-voltage electrical enclosures GB 2829 Sampling procedures and sampling tables for periodic inspection (suitable for inspection of production process stability) MT 154.1 Guidelines for compiling models of coal mine electromechanical products and management methods MT 154.2 Modeling method of electrical control equipment used in coal mining face JB4002 Explosion-proof low-voltage electrical terminals for mining JB4262 Explosion-proof low-voltage electrical appliance rubber cable entry device

3 Terminology

3.1 Except for the terms specified in this standard, the rest shall meet the requirements of GB 2900.1, GB 2900.18, GB 2900.35, and GB 3836.1 ~ 3836.4. 3.2 Terms defined in this standard 3.2.1 Relay. When the leakage resistance value in the network reaches or is less than the set value, it can automatically turn off the switching equipment of the network. 3.2.2 Relay action time. In the case of power transmission operation of the network, the single-phase grounding time through the 1kΩ resistor to the relay action time. 3.2.3 Leakage resistance. Leakage resistance that causes the relay to operate under specified grid conditions. 3.2.4 Leakage latch-up. It is impossible to explain the insulation resistance of the load-side switch or electromagnetic starter on the load side when it is disconnected Power transmission function. 3.2.5 Leakage blocking resistance value. After a leakage action occurs in the power grid, the network insulation resistance is reduced to a set value, and the feed switch or electromagnetic start is started. The load side of the device is tested, and electrical lockout is performed to prevent the protected electrical equipment from closing and transmitting power, and the insulation resistance value of the network to ground when the leakage lockout state is reached. 3.2.6 Setting value. According to the specified conditions, follow the leakage action resistance value or leakage blocking resistance value within a specific range. MT/T 189-88 3.2.7 DC detection voltage value. Use the additional DC power supply method to detect the DC voltage value of the earth leakage or blocking of the insulation resistance to ground during the network. 3.2.8 DC detection current. When the additional DC power supply method is used to detect the leakage or blocking resistance of the network to ground insulation, When the resistance is zero, the maximum detected DC current through the detection circuit. 3.2.9 Auxiliary grounding. An auxiliary device added to prevent the relay from being poorly grounded at the main ground point. 3.2.10 Self-check function. A function that can automatically cut off the power supply when the relay cannot operate normally due to its own failure. 3.2.11 Manual reset. The power supply network or the protected electrical equipment leaks. To prevent the recombination of the brake after the trip mechanism is activated, the accident will expand. Only after full-time manual reset by the full-time personnel, can the power be switched on and off. 3.2.12 Compensation rate. When the distributed capacitance is a certain value, the capacitance current of the 1kΩ resistor to ground is compensated in the best state to reduce it. Part, with percentage of current value without compensation. 4 Product classification, model establishment and basic parameters 4.1 Product Classification 4.1.1 By protection 4.1.1.1 Relays with non-selective trips with leakage trip and leakage blocking functions. 4.1.1.2 Relays with selective trips with leakage trip and leakage blocking functions. 4.1.1.3 Relay with selective leakage trip function. 4.1.1.4 No-selective performance trip relay with leakage trip function. 4.1.2 By voltage level The relay can be made with rated voltages of 660/380V, 1140/660V. 4.1.3 Divided by compensation type With and without compensation. 4.2 Type designation 4.2.1 Product models are compiled according to MT 154.1 and MT 154.2. 4.2.2 Product model compilation example. Explosion-proof type with compensation leak detection relay 4.3 Basic parameters The basic parameters of the relay shall meet the requirements of Table 1. 4.4 The rated frequency of the power supply is 50Hz. 4.5 The relay is a long-term operating system.

5 Technical requirements

5.1 The relay shall meet the requirements of this standard and be manufactured in accordance with the drawings and documents approved by the prescribed procedures. 5.2 The relay shall comply with the relevant provisions of GB 3836.1 ~ 3836.4, and must be sent to the inspection unit designated by the national labor safety department. Inspection should be carried out in accordance with the standards, and the "explosion-proof certificate" of the designated inspection unit can be used for production. 5.3 Relay normal working conditions and installation conditions. a. Altitude does not exceed.2000m; b. The ambient temperature is not higher than 40 ° C and not lower than -5 ° C. If the ambient temperature is different, it must be marked on the nameplate, Calculate temperature rise based on ambient temperature; c. The relative humidity of the air is not more than 95% (equivalent to 25 ℃); d. in mines with explosive mixtures of biogas; e. Where there is no significant shaking and shock vibration; f. Place where the inclination to the horizontal plane does not exceed 15 °; g. in an environment free of gases and vapors that damage insulation; h. In the place without dripping water and other liquids; i. Installation category III; j. Pollution level is 3. 5.4 The dielectric performance of the relay must be able to withstand the AC 50Hz power frequency withstand voltage test for 1 minute without breakdown or flashover. 5.4.1 For the main circuit and the control circuits and auxiliary circuits required to be connected to the main circuit, the power frequency withstand voltage test voltage value shall comply with the requirements of Table 2. 5.4.2 For control circuits and auxiliary circuits that are not connected to the main circuit, the power frequency withstand voltage test voltage value shall comply with the requirements in Table 3. 5.5 The humidity and heat resistance requirements of the relay shall meet the requirements of Chapter 28 of GB 3836.1. After the test. a. The insulation resistance value under different rated insulation voltages shall meet the requirements of Table 4; b. The voltage value of the power frequency withstand voltage test is the specified value in Tables 2 and 3, and the breakdown time or flashover phenomenon should not occur when the pressure is applied for 1 minute; c. Check that the operating parameters meet the requirements of Table 1. 5.6 The temperature rise limit of each part of the relay measured under the following conditions should not exceed the requirements of Tables 5 and 6; a. The control power voltage is the rated value; b. The components related to heating should be selected at the maximum heating value; c. Other internal components (such as contacts, wire terminations, etc.) are limited to not damage the normal operation of this component and connected or adjacent components; d. The coil is the rated voltage value at the rated frequency. 5.7 The relay should be able to work reliably when 75% ~ 110% of the rated voltage of the power supply. 5.8 The relay's leakage action resistance value at 75% ~ 110% of the rated current and voltage, and the leakage blocking resistance value can be based on the network capacitance as 0.22μF/phase, the insulation resistance is infinite, set according to the values in Table 1. When the grid insulation resistance decreases to the leakage action resistance setting value When this happens, the relay should be able to operate reliably. When the grid insulation resistance returns to the setting value of the blocking resistance, the relay should be able to release the blocking reliably. The error between the leakage action resistance and the blocking resistance value is not greater than ± 20% (within the grid-to-ground capacitance between 0.1 and 1.0 μF/phase). 5.9 The operating time of the relay shall meet the requirements in Table 1. 5.10 The relay with leakage compensation function has infinite insulation resistance to ground on the network, and distributed capacitance to ground is 0.22 ~ 1.0μF/phase. The single phase is grounded through a 1kΩ resistor, and its compensation rate is not less than 60%. 5.11 Before the relay with the requirements for leakage blocking function manufactured according to 4.1.1.1, when the leakage blocking resistance is less than the set value before the network is powered When it is necessary, the leakage switch must be locked to prevent the switch from closing. When the network insulation resistance is greater than the leakage lockout setting in Table 1, Only after manual reset can the leakage lock of the feed switch be released. 5.12 The relay leakage blocking circuit should meet the requirements of intrinsic safety, and the same positive polarity should be used for grounding. The DC measurement voltage should not exceed 40V additional DC power supply, DC detection current is not more than 5mA. And to obtain the safety of the inspection unit designated by the national labor safety department Inspection certificate or safety certificate. 5.13 Under the rated voltage, the relay operates 600 times per hour, and the mechanical life is not less than 30,000 times. 5.14 The relay has an electrical life of not less than 20,000 times under the rated voltage and rated frequency of the power supply at 50Hz. It should still be able to continue working after the test. 5.15 The relay shall have a certain self-test function. 5.16 Structural design of the relay 5.16.1 The appropriate position on the surface of the relay housing shall have the following devices. a. A thousand ohmmeter showing the insulation resistance of the power grid; b. Capacitor compensation adjustment device and milliamp meter; c. Color signal display for working status and fault status. red --- leakage, green --- normal work, yellow --- blocking; d. leakage leakage simulation leakage inspection test device; e. With auxiliary ground lead-in terminal device. 5.16.2 In addition to the electronic and electrical components used in circuits, they must also meet the requirements of this standard. 5.16.3 The terminals of the relay shall comply with the provisions of JB4002. 5.16.4 The cable entry device of the relay shall comply with the provisions of JB4262. 5.16.5 The protection level of the relay casing shall meet the requirements of IP44 in GB 4942.2. 5.16.6 The shape, connection and installation dimensions of the relay shall comply with the relevant current standards. 5.16.7 The shell material, dynamic strength, static strength, and flameproof performance of the relay shall meet the requirements of GB 3836.1 ~ 3836.2. Meet the following requirements. 5.16.7.1 The flameproof enclosure shall consist of a flameproof main cavity and a junction box (flameproof or increased safety). In order to facilitate the use of mobile, you should consider fixing and installation. 5.16.7.2 There should be enough space in the junction box to allow external cables to be introduced into the terminal block inside the wiring via the housing lead-in device and into the main cavity through the terminal. 5.16.7.3 The relay shall be selected from suitable materials with stable performance, with fine fabrication, flexible operation, reliable connection, convenient wiring, and good electrical contact. 5.16.7.4 The relay housing must be provided with a reliable interlocking device. When the power is on, the cover cannot be opened; Can be connected, the shell fastened with bolts is allowed to be replaced by a warning sign, the warning sign must be marked "open the cover after power off". 5.16.7.5 The relay casing shall be provided with internal and external ground bolts in accordance with the provisions of Chapter 15 of GB 3836.1. 5.16.7.6 The transparent part of the observation window on the relay housing must be able to withstand the impact test specified in Article 21.2 of GB 3836.1. 5.16.7.7 After the output terminal of the relay is powered off, if there are still live parts in the case, protective insulation cover plates shall be provided, and the warning signs with the word “live” shall be marked. 5.16.7.8 All parts made of ferrous metals (except magnetic system parts) shall be protected by corrosion protection. Flameproof surface should be phosphating Treat and apply 204-1 antirust oil. 5.16.7.9 All threaded connections and protection insert installations are provided with measures to prevent self-loosening. 5.16.7.10 The clearance, length and roughness of the flameproof joint surface of the relay shall meet the requirements of GB 3836.2. 5.17 When the relay is installed according to pollution level 3 and category III, the electrical clearance and creepage distance of each conductive part in the main cavity. 5.17.1 The electrical clearance in the main cavity of the relay shall be less than specified in Table 7. Table 7 Relative phase (relative ground) from system rated voltage Voltage U (AC effective value) Clearance mm U < 50 0.8 50 \u003cU≤100 0.8 100 \u003cU≤150 1.5 150 \u003cU≤300 3.0 300 \u003cU≤600 5.5 600 \u003cU≤1000 8.0 1000 \u003cU≤1200 14.0 5.17.2 The relay shall determine the creepage of each conductive part in the main cavity according to pollution level 3, rated insulation voltage or rated working voltage and material group. The distance is not less than the requirements in Table 8. Insulating materials can be divided into the following four groups according to their Comparative Tracking Index (CTI). Insulation material group I. CTI≥600 Insulation material group Ⅱ. 600 > CTI≥400 Insulation material group Ⅲa. 400 > CTI≥175 Insulation material group Ⅲb. 175 > CTI≥100 MT/T 189-88 Table 8 Rated insulation voltage or working voltage (AC effective value or DC value) Creepage distance of electrical appliances under long-term voltage mm Talent group Ⅰ Ⅱ Ⅲa Ⅲb 10 1.0 1.0 1.0 1.0 20 1.2 1.2 1.2 1.2 36 1.4 1.6 1.8 1.8 63 1.6 1.8 2.0 2.0 127 1.9 2.1 2.4 2.4 220 3.2 3.6 4.0 4.0 380 5.0 5.6 6.3 6.3 660 8.0 9.0 10.0 1140 16.0 18.0 20.0 5.18 The electrical clearance and creepage distance in the relay junction box shall comply with the provisions of Chapter 5 and Chapter 6 of GB 3836.3.

6 Test method

6.1 Flameproof performance and dynamic strength test (Articles 5.2 and 5.16.7) shall be conducted in accordance with the provisions of Chapter 19 and Chapter 20 of GB 3836.2. 6.2 Power frequency withstand voltage test (Article 5.4) shall be conducted in accordance with the provisions of Chapter 6 of GB 998 and Article 8.2.2.3.2 of GB 1497. When testing, Disconnect the central point from the control loop and the AC bypass capacitor. 6.3 Moisture and heat performance test (Article 5.5) shall be conducted in accordance with the provisions of Chapter 28 of GB 3836.1. The withstand voltage should meet the requirements of Table 2 and Table 3, and the electrical performance should meet the requirements of Table 1. 6.4 Temperature rise test (Article 5.6) shall be conducted in accordance with the provisions of Chapter 5 of GB 998. 6.5 Voltage fluctuation test (Article 5.7). Adjust the grid voltage to the rated voltage, and measure the leakage operating resistance value and leakage blocking resistance respectively. Identification value. Then increase the grid voltage to 110% of the rated voltage and reduce it to 75% of the rated voltage, and measure the set value and The setting value of the leakage blocking resistance should meet the requirements in Table 1. 6.6 Setting test of leakage action resistance and leakage blocking resistance (Article 5.8) 6.6.1 The leakage action resistance is set when the network capacitance is 0.22μF/phase and it is in the best compensation setting. Connect the method shown in Figure 1. Big to small. Try it step by step until the circuit state is reversed, which is the setting value of the leakage action resistance.The 1140V level allows 3 times single-phase leakage electric Use resistance for three-phase tuning. The test circuit is specified in Figure 2. The method is the same as before, but the resistance of each phase should be consistent during the test. Figure 1 380/660V test method MT/T 189-88 Figure 2 1140V test method 6.6.2 Leakage blocking resistance setting, according to the lines specified in Figures 1 and 2, increase the resistance value step by step until the circuit state is reversed, which is the leakage blocking. Resistance setting value. The 1140V voltage level allows three-phase tuning according to 3 times the single-phase leakage blocking resistor, and maintains the three-phase resistance consistent. 6.7 Action time test (Article 5.9) Test the circuit according to Figure 3, and the insulation resistance of each phase of the relay is infinite, and the distributed capacitance is 0.22, 0.47, 0.69, 1.0 μF/phase, and adjusted to the best compensation, press the SA button, at this time take the average value of 10 readings each in the millisecond table is the action time. Figure 3 1140, 660, 380V test method J is the test relay, J1 and J2 should be strictly synchronized, and the error should not be greater than 2ms. 6.8 Compensation rate test (Article 5.10) must first measure the uncompen......
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