What are the identification methods for capacitors? Please, 3Q

Capacitance marking method: (1) Direct marking method: use letters and numbers to mark the model and specification directly on the shell.

2) Text symbol method: use a regular combination of numbers and text symbols to represent the capacity. The literal symbol indicates the unit of its capacitance:

p, n, u, m, f, etc. It is the same as resistor. The nominal allowable deviation is also expressed in the same way as the resistance.

For capacitances less than 10pf, the allowable deviation is replaced by the letters: b-c-d-f-f-1pf. (3) Color scale method:

It is expressed in the same way as resistor, and the unit is generally pf. The withstand voltage of small electrolytic capacitors is also marked by the color mark method, and the position is close to the root of the positive lead-out wire, and the meaning is shown in the following table: Color: Black, brown, red, orange, yellow, green, blue, violet, gray Withstand voltage: 4v 10v, 16v, 25v, 32v, 40v, 50v, 63v (4) Marking method of imported capacitors:

Imported capacitors generally have 6 components. The first item: Indicate the category with letters:

The second item is to use two digits to indicate its shape, structure, packaging method, lead start and relationship with the shaft. Item 3:

The temperature characteristics of temperature compensated capacitors are written and colored, and their meanings are shown in the following table: Serial number Letter Color Temperature coefficient Allowable deviation Letter color Temperature coefficient Allowable deviation 1 A Gold +100 r Yellow -220 2 B Gray +30 S Green -330 C Black 0 T Blue -470 4 g 30 U Purple -750 5 h Brown -30 60 V -1000 6 J 120 W -1500 7 K 250 x -2200 8 L Red -80 500 Y -3300 9 m 1000 Z -4700 10 N 2500 SL +350 -1000 11 P Orange -150 yn -800 -5800 Remarks: The unit of temperature coefficient is 10e -6 ; The allowable deviation is %.

Traditionally, there are only two types of logos: C and E.

The meaning of the characters identified on the capacitor:

1. If you see + next to the electrode, it means that this is the positive electrolytic capacitor of the capacitor is polar, and it will explode if it is reversed, if you see the + Y-shaped notch on the aluminum shell directly above the electrolytic capacitor, it is in case the polarity is reversed or overvoltage, and the capacitor bursts, let it explode in this direction first, so as not to explode into a mess.

2. If it is x, y, it means that the capacitance is x capacitance, y capacitance x capacitance refers to the capacitance across the live wire between the neutral line (l n), y capacitance refers to the capacitance across the live wire ground wire or the neutral line ground wire (l g n g), l line, n neutral, g ground, x, y capacitors are safety capacitors.

Safety capacitors are used in such occasions that after the capacitor fails, it will not cause electric shock and will not endanger personal safety.

GJB151 stipulates that the capacity of Y capacitor should not be greater than 0 1UF Y capacitor in addition to the corresponding grid voltage withstand voltage, but also requires this capacitor to have sufficient safety margin in terms of electrical and mechanical properties to avoid the breakdown short circuit phenomenon of sail under extremely harsh environmental conditions, and the voltage resistance of Y capacitor is of great significance to protect personal safety.

The electrician symbols that belong to the capacitor in the electrical component symbol are as follows:

When a voltage is added between the two plates of a capacitor, the capacitor stores an electric charge. The capacitance of a capacitor is numerically equal to the ratio of the amount of charge on one plate to the voltage between the two plates.

The basic unit of capacitance of a capacitor is farad (f). In circuit diagrams, the letter C is usually used to denote capacitive components.

Classification of capacitors

1. According to the structure, it is divided into three categories: fixed ridge capacitors, variable capacitors and trimmer capacitors.

2. Classification by electrolyte: organic dielectric capacitors, inorganic dielectric capacitors, electrolytic capacitors, electrothermal capacitors and air dielectric capacitors, etc.

3. According to the application, it is divided into: high-frequency bypass, low-frequency bypass, filtering, tuning, high-frequency coupling, low-frequency coupling, and small capacitors.

4. According to the different manufacturing materials, it can be divided into: porcelain dielectric capacitors, polyester capacitors, electrolytic capacitors, tantalum capacitors, and advanced polypropylene capacitors with medium branch penetration, etc.

The electrician symbols are as follows:There are two types of electrical symbols for capacitors: one part is a graphic symbol (two letters t docking), marking the type of capacitor; Part of it is letters + numbers, identifying the serial number, capacitance, withstand voltage value and other main parameters of the capacitor in the electric range.

In electrical circuit diagrams, capacitors are represented by special graphic symbols and circuit identification.

Understanding of Capacitor Symbols:Electrolytic capacitors have the advantages of small size, large capacitance and low cost, but their two pins have positive and negative polarity, which limits its range of use, while non-polarized electrolytic capacitors are not limited.

The graphic symbol (circuit symbol of the paulownia) reflects the basic type of capacitor; The lead wire is extended from both ends of the circuit symbol and communicates with the electrical line in the circuit diagram to form an electronic circuit; The polarity identifier indicates the polarity of the capacitor, and the circuit identifier usually provides parameter information such as the capacitor's identification, name, serial number, and capacitance.

The symbol identified on a capacitor usually indicates its capacitance value, voltage rating, polarity, and other important parameters. Here are some common capacitor identifiers and what they mean:

Capacitance value (capacitance): Capacitor identifiers typically represent capacitance values in the unit method. For example, identified as:"10uf"Indicates that the distribution capacity value of the telemarketing is 10 microfarads.

Voltage Rating: A symbol on a capacitor may indicate its voltage rating to indicate the maximum voltage that the capacitor can withstand. For example,"25v"Mega Bucket Head indicates that the voltage rating of the capacitor is 25 volts.

Polarity: For polarity capacitors, such as aluminum electrolytic capacitors or tantalum capacitors, the identifier may contain positive and negative polarity indications. Usually used"+ or"- symbol to indicate the polarity of the capacitor.

Temperature coefficient: Some capacitors may have a temperature coefficient identifier that indicates how much the capacitance value changes with temperature. Common temperature coefficient symbols include:"x7r"、"y5v"Wait.

Manufacturer identification: Sometimes there will be a manufacturer's logo on the capacitor to indicate its manufacturer or brand.

The capacitive identifiers provided are explained below:

CBB60: This is the model or specification of the capacitor** that indicates the specific type and design of the capacitor.

The meanings of the other logos are as follows:

30 F 5%: This means that the capacitor is rated at 30 microfarads (f) with a capacitance tolerance of 5%, i.e. the actual capacitance may fluctuate by 5% above or below the rated capacity.

50 60Hz: This indicates the rated operating frequency range of the capacitor, which can operate from either 50 hertz (Hz) or 60 hertz (Hz) AC power.

450VAC: This means that the capacitor is rated at 450 volts (VAC), i.e. it can withstand up to 450 volts AC.

3000h: This indicates that the rated service life of the capacitor is 3000 hours, which indicates the time that the reliability and performance of the capacitor remain unchanged under the specified conditions.

40 85 21: This is the operating temperature range of the capacitor, which indicates that the capacitor can operate normally in a temperature range from -40 degrees Celsius to 85 degrees Celsius.

CE: This may be a mark of compliance with European CE marking standards, indicating that the capacitor meets the relevant European safety and performance requirements.

EN60252-1: This is a specification or standard number that indicates that the capacitor meets the requirements of the EN60252-1 standard. Spring Ziming.

This may be the date of manufacture of the capacitor or the related code, indicating that the manufacturing date of the capacitor is March 2023.

Please note that the above explanations are only common explanations for book-to-book capacitor labeling and may not be applicable in all cases. The meaning of the specific designation may vary depending on the manufacturer, product specifications, and international standards, and it is recommended to consult the relevant manufacturer's documentation or specifications for accurate explanations and information.

This should be a polyester capacitor, and the indication of the withstand voltage of the polyester capacitor is a combination of a number and a letter. The number represents the power exponent of 10, and the letter represents the numeric value in v (volts). Letter = numeric value a= b= c= d= e= f= g= h= j= k= z= For example:

2a stands for (i.e. 2 times multiplied by 10), 2g stands for j, and j stands for first-class k, second-class good.

"Good Store 123" on household appliances!

Power capacitors include phase-shifting capacitors, electric thermal capacitors, equalizing voltage capacitors, coupling capacitors, pulse capacitors, etc. Phase-shifting capacitors are mainly used to compensate reactive power to improve the power factor of the power system; Electric thermocapacitors are mainly used to improve the power factor of intermediate frequency power systems; Equalizing capacitors are generally connected in parallel on the fracture of the circuit breaker for voltage equalization; Coupling capacitors are mainly used for power transmission line communication, measurement, control, protection and power extraction devices; Pulse capacitors are mainly used for pulse circuits and DC high-voltage rectification filtering.

The nameplate of a phase-shifting capacitor includes the model number, capacitance value, rated frequency, etc.

The model consists of two parts: letters and numbers.

The first letter indicates the purpose of the capacitor: y - for phase shifting; c - for tandem.

The second letter indicates the impregnate: Y – mineral oil impregnation; w - alkylbenzene impregnation; l Chlorinated biphenyl impregnation.

The third letter indicates the dielectric material or place of use: f - composite medium (capacitor paper and polypropylene film); W - outdoor use (phase shifting capacitors produced by Beijing Power Capacitor Factory are common both inside and outside).

Digital part. The first number - rated voltage (kv);

the second digit – nominal capacity (kvar);

The third number is the number of phases.

For example, a mineral oil-impregnated phase-shifting capacitor for indoor use with a rated voltage of 12 kvar nominal capacity, three-phase; , phase-shifting capacitors representing alkylbenzene gold, for indoor use, rated voltage, nominal capacity of 16kvar, single phase; , indicates chlorinated biphenyl impregnated phase shifting capacitor, outdoor type, rated voltage, nominal capacity of 50kvar, single phase; , a phase-shifting capacitor representing a combined dielectric impregnated with chlorinated biphenyls with a rated voltage of 25 kvar and a nominal capacity of 25 kvar, single phase.

Capacitance value: The capacitance value on the nameplate, which is the measured capacitance value of each capacitor. It should not deviate from the rated capacitor by more than 10%.

Frequency: Refers to the rated frequency of the capacitor.

I'm pretty sure.

It is generally referred to as the nominal voltage, that is, the rated operating voltage.

The rated operating voltage of a capacitor refers to the maximum DC voltage or the maximum effective AC voltage that can be continuously applied to the capacitor at any temperature between the minimum allowable ambient temperature and the rated temperature.

The subject is the nominal voltage, which is the rated operating voltage.

1. The rated working voltage of the capacitor refers to the maximum DC voltage or the maximum effective value of the AC voltage that can be continuously added to the capacitor when the capacitor returns to the minimum allowable ambient temperature and any temperature value between the rated temperature.

2. The rated voltage is the best voltage applicable to the electrical appliance when it works for a long time. It is easy to burn out if it is high, and it does not work properly if it is low (the bulb does not shine normally, and the motor does not work normally). At this time, the components in the electrical appliances are working in the best state, and only when they are working in the best state, the performance of the electrical appliances is relatively stable, so that the life of the electrical appliances can be extended.

It is the maximum voltage value, that is, the withstand voltage value.

The naming of domestic capacitor models consists of four parts.

The first part is indicated by the letter "C" and the main is called the capacitor back.

The second part of the answer is to indicate the dielectric material of the capacitor in letters.

The third part uses numbers or letters to indicate the class of capacitors.

The fourth part is numbered by numbers.

The model nomenclature of foreign capacitors consists of six parts.

The first part uses letters to indicate the type of capacitor.

The second part uses numbers to represent the outline structure.

The third part uses letters to indicate the temperature characteristics.

The fourth part uses letters or numbers to indicate the withstand voltage value.

The fifth part represents the nominal capacity in numbers.

The sixth part is indicated by letters for permissible deviations.

No matter how specific it is, you need to refer to the detailed standards.

Zeng Wu shared the nominal identification method of capacitors in household appliance maintenance.