REM543CM216AAA | ABB Machine protection relay

Description

The so-called "safety relay" is composed of several relays and circuits, in order to be able to complement each other's abnormal defects, to achieve the complete function of the correct and low false operation of the relay, so that the lower the error and failure value, the higher the safety factor, "safety relay" is not "no fault relay", but to make regular action when the fault occurs. It has a forced guide contact structure, in case of contact melting phenomenon can also ensure safety, which is completely different from the general relay. The safety relay is the necessary control part of a safety loop, which accepts the safety input and deterministic output switching signal to the control loop of the device through the judgment of the internal loop. Simply put, the safety relay is a two-channel signal type, only when the two channel signals are normal, the safety relay can work normally; During the working process, as long as either channel signal is disconnected, the safety relay will stop output until the two channel signals are normal and reset to work normally. First, the working principle of safety relay 1. Electromagnetic type Electromagnetic relays are generally composed of iron core, coil, armature, contact reed and so on. As long as a certain voltage is added to both ends of the coil, a certain current will flow through the coil, resulting in an electromagnetic effect, and the armature will overcome the pull of the return spring under the action of electromagnetic force attraction to attract the iron core, thereby driving the moving contact of the armature (normally open contact) and the static contact (normally closed contact). When the coil is powered off, the electromagnetic suction will also disappear, and the armature will return to the original position in the spring reaction force, so that the moving contact and the original static contact are released. This suction, release, so as to achieve the purpose of conduction in the circuit, cut off. For the "normally open, normally closed" contact of the relay, it can be distinguished in this way: the static contact in the disconnected state when the relay coil is not powered on is called "normally open contact"; The static contact in the connected state is called "normally closed contact". 2, heat sensitive dry Reed thermal-reed relay is a new type of thermal-sensitive switch which uses thermal-sensitive magnetic material to detect and control temperature. It is composed of a temperature-sensing magnetic ring, a constant magnetic ring, a reed pipe, a heat-conducting mounting piece, a plastic substrate and some other accessories. Thermal reed relays do not use coil excitation, and the magnetic force generated by the constant magnetic ring drives the switching action. Whether the constant magnetic ring can provide magnetic force to the reed tube is determined by the temperature control characteristics of the temperature-sensing magnetic ring. 3. Solid state A solid-state relay is a four-terminal device with two terminals as input and the other two terminals as output, and an isolation device is used in the middle to achieve electrical isolation of input and output.

Relay protection is mainly the use of short-circuit or abnormal components in the power system when the electrical volume (current, voltage, power, frequency, etc.) changes constitute the principle of relay protection action, as well as other physical quantities, such as failure in the transformer tank accompanied by a large number of gas and oil flow speed increase or oil pressure strength increase. In most cases, no matter what kind of physical quantity is reflected, the relay protection device includes a measurement part (and a value adjustment part), a logic part, and an executive part. (1) The parameters in the operation of the power system (such as current, voltage, power factor Angle) are obviously different in normal operation and fault conditions. The relay protection device is to use the changes of these parameters to judge the nature and scope of the power system fault on the basis of reflection and detection, and then make the corresponding reaction and treatment (such as issuing a warning signal or tripping the circuit breaker, etc.). (2) Analysis of the block diagram of the relay protection device: A, sampling unit - it will be protected in the operation of the power system physical quantities (parameters) through electrical isolation and conversion into the relay protection device in the identification unit can accept the signal, by one or several sensors such as current, voltage transformer. B, the comparison identification unit -- including the given unit, the signal from the sampling unit is compared with the given signal, so that the next level of processing unit sends out what signal. (normal state, abnormal state or fault state) the comparison identification unit can be composed of four current relays, two for quick-break protection and two for over-current protection. The setting value of the current relay is the given unit, and the current coil of the current relay receives the current signal from the sampling unit (current transformer). When the current signal reaches the current setting value, the current relay acts and sends the signal to the next level processing unit through its contact to make the circuit breaker finally fall off. If the current signal is less than the setting value, the current relay does not operate, and the signal transmitted to the lower unit does not operate. Identify and compare signal "quick break", "overcurrent" information is transmitted to the next unit for processing. C, the processing unit -- accept the signal from the comparison identification unit, process according to the requirements of the comparison identification unit, and determine whether the protection device should act according to the size, nature and sequence of the combination of the output of the comparison link; It is composed of time relay and intermediate relay. Current protection: quick break - intermediate relay action, overcurrent - time relay action. (Delay process) D, execution unit -- fault handling is implemented through the execution unit. The execution unit is generally divided into two categories: one is the acoustic and optical signal relay; (such as electric whistle, electric bell, flashing light, etc.) Another type of circuit breaker for the operating mechanism of the switching coil, so that the circuit breaker is switched off. E, control and operation power supply -- the relay protection device requires its own independent AC or DC power supply, and the power supply power is also increased or decreased due to the number of controlled equipment; The AC voltage is generally 220 volts, and the power is above 1KVA.

Feature editing broadcast 1, intelligent host, the host uses high-performance digital signal processor. 2, stand-alone operation. 3, connect the computer to run. 4, 16-bit DAC chip. 5, large screen LCD display library. 6, "fool" operation. 7. New high-fidelity power amplifier. 8. Direct output of current and voltage. 9. Protect yourself. 10. Rich contacts. 11, the host integrated single-box structure. 12, cost-effective. Basic requirement The relay protection device should meet the requirements of reliability, selectivity, sensitivity and quickness: these four "characteristics" are closely linked, both contradictory and unified. selectivity -- means that the fault is first removed by the protection of the faulty equipment or line itself. When the protection of the faulty equipment or line itself or the circuit breaker refuses to move, the fault is allowed to be removed by the protection of adjacent equipment, line protection or circuit breaker failure protection. The setting of relay protection between upper and lower power networks (including the same level) should follow the principle of step-by-step cooperation to ensure that the fault is selectively removed when the power network fails. Disconnect the faulty part of the system, while other non-faulty parts continue to supply power. rapidity -- refers to the protection device should be removed as soon as possible short circuit fault, its purpose is to improve system stability, reduce the damage of the faulty equipment and lines, reduce the spread of the fault, improve the automatic reclosing and standby equipment automatic input effect. sensitivity -- When a metallic short circuit occurs within the protected range of the equipment or line, the protection device should have the necessary sensitivity coefficient (as specified in the regulations). It is realized by setting the value of relay protection. The setting value is generally checked once a year. reliability -- refers to the relay protection device in the protection range of the operation should be reliable action, in the normal operation state, should not be reliable action. Any power equipment (line, bus, transformer, etc.) is not allowed to operate in a state without relay protection, and reliability is the most fundamental requirement for the performance of the relay protection device.

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