What does KA, KT stand for? Electrically?

KA (Intermediate Relay). KT (Time Relay).

Electrical KT stands for Time Relay.

Electrical) In the circuit diagram, KT stands for Time Relay KA: Intermediate Relay.

km: Contactor circuit diagram common symbols: AC AC DC DC FUs.

g generators. M motor HG green light HR red light HW white light. HP light brand K relay.

KA (Intermediate Relay). KD differential relays. KF flash relay.

Safety Precautions for Electrical Repairs:

1. Apprentices and interns are not allowed to work alone, and non-electrical personnel are prohibited from engaging in electrical work. There are many colleges and universities that have organized the examination of electrician grade certificate and special type of work operation certificate, which is good for recruitment, otherwise the unit will organize to get the certificate.

2. In daily work, wear labor protection equipment. Including gloves, insulated shoes, safety helmets, etc., once I had two peers in the circuit breaker into the slag Tan line maintenance, the dispatch issued an error command to send power by mistake, the result is not wearing gloves one was shocked, wearing gloves is fine.

3. Carry out the operation of power outage according to the operation requirements, and shall not stop power transmission without permission, especially for employees in high-level distribution stations and substations.

4. When some equipment needs to be overhauled, warning signs should be hung (under maintenance, it is strictly forbidden to close), and the principle of who is listed and who is delisted should be implemented.

5. When a fire occurs in electrical equipment, the power supply should be cut off immediately, and a fire extinguisher should be extinguished with a dry stool powder fire extinguisher. It is strictly forbidden to extinguish the fire with water. <>

KT stands for Time Relay.

Time Relay Introduction:

Time relay refers to a kind of relay that produces a jump change (or contact action) after the input action signal is added (or removed) by the output circuit after the specified accurate time.

It is an electrical component used to turn on or off a circuit with a higher voltage or a lower current to turn on or off a circuit with a higher voltage or a higher current.

Time relay is a very important component in electrical control system, and in many control systems, time relay is required to achieve delay control.

Time relays are classified according to their working principle for the following two points:

1. Motor-type time relay.

The motor-type time relay uses a miniature synchronous motor to drive the reduction gear train to obtain a time delay.

Features: Wide delay range, up to 72 hours, delay accuracy up to 1%, and the delay value is not affected by voltage fluctuations and ambient temperature changes.

The delay range and accuracy of the motor-type time relay are incomparable with other time relays, and its disadvantages are complex structure, large size, low life, high price, and the accuracy is affected by the power supply frequency.

2. Electronic time relay.

The electronic time relay uses the principle that the capacitive voltage in the RC circuit cannot jump, but can only change gradually according to the exponential law, that is, the resistor nib characteristic to obtain the time delay. <>

In electrical KA generally refers to intermediate relays.

The intermediate relay is a multi-purpose automatic telecontrol appliance in relay protection and automatic control system. Intermediate relays are well isolated because they are electrically isolated. So that the controller and the controlled party have no electrical connection, and the purpose of safety control is achieved.

The operating voltage of the relay is not more than 70% of the rated voltage.

The return voltage of the relay shall not be less than 5% of the rated voltage.

The action time of the relay is not more than 60ms.

The power consumption is not more than 4kw at the rated voltage.

Thermal performanceWhen the ambient temperature is 40, the relay coil can withstand 110% of the rated voltage value for a long time, and the temperature rise does not exceed 65.

The following issues should be taken into account when using intermediate relays:

1) There are many contacts of intermediate relays, one rarely has 8 pairs, 6 pairs, etc., and is divided into normally open contacts and normally closed contacts. However, the capacity of the contact is small, there is no main and auxiliary contact, and there is no arc extinguishing device, so when the intermediate relay is used to control the start and stop of the motor, only a small motor with a rated current of less than 5A can be used, and a maximum model of JZ7 intermediate relay is selected for control.

2) There are many kinds of rated voltage of the working coil of the intermediate relay, and the working voltage of the intermediate relay coil must meet the requirements of the rated voltage of the intermediate relay coil in the application.

In general, this is an intermediate relay.

Let's take a look at intermediate relays:

Intermediate relay is an electrical appliance used to increase the number and capacity of contacts in relay protection and automatic control systems, and is also used to transmit intermediate signals in control circuits. Generally, it is divided into static type and electromagnetic type.

The structure and principle of the intermediate relay are basically the same as the AC contactor, and the main difference with the contactor is that the main contact of the contactor can pass through a large current, while the contact of the intermediate relay can only pass a small current, so it can only be used in the control circuit.

Intermediate relays generally do not have main contacts, because the overload capacity is relatively small, so all the contacts it uses are auxiliary contacts, and the number is relatively large.

The definition of intermediate relay in the new national standard is K, and the old national standard is Ka. Generally, it is powered by DC power supply, and a few use AC power supply.