HAT821 dual power bus tie controller is mostly used in the switching system of two-line and one bus tie. It can detect the voltage and frequency of two lines, judge the normal and abnormal conditions of them, and automatically execute the operation of three circuit breaker switches according to the main setting.
HAT821 advantage 1
Compared with the traditional automatic bus transfer device.
Do not need to separate the manual-automatic button, directly switch between manual and automatic mode on the pannel;
Do not need to lead out multiple closing and opening buttons separately. There are 6 buttons on the controller directly control the closing and opening of the circuit breaker;
Reducing the complex wiring and making operation simpler.
HAT821 advantage 2
Intelligent power supply switch inside the controller.
The circuit breaker switch power supply is normal as long as there is a normal voltage;
Provide AC 220V operating power supply for circuit breaker directly;
L0, N0 power output capacity is 16A, which can ensure the normal power supply for circuit breaker switch.
HAT821 advantage 3
Automatic control function, three kinds of automatic logic are available for users.
(S1,S2 mainly used): both channels are mainly used. When both power supply are normal, the two-line circuit breakers close the power supply respectively, and the bus tie is in the breaking state. When there is one abnormal switch, another switch and bus tie switch close to supply power for two loads;
(S1 mainly used): one channel is maily used, (S1) one channel is normal, one breaker and the bus tie switching the power supply, when one is abnormal and two voltage is nomal, (S2) 2 switches and bus tie switching power supply;
(S2 mainly used): two channels are mainny used, (S2) two channels are nrmal, two breakers and bus tie switching the power supply, when the two channels are normal and one votage is normal; (S1) one breaker and bus tie switching power supply.
HAT821 advantage 4
Multiple communication interfaces.
It has a d-type USB communication interface, which can be used to connect PC to test software configuration parameters and upgrade module programs;
It has two RS485 communication ports, which can not only realize the centralized monitoring “three-remote” function, but also realize the connection with the web of things and realize the cloud monitoring function.
User application cases
Application occasion: the project is applied to a large chemical enterprise.
Application mode: (S1,S2) two main modes in the site. When both power supply are normal, the two-line circuit breakers close the power supply respectively, and the bus tie is in the breaking state. When there is one abnormal switch, another switch and bus tie switch close to supply power for two loads.
Electrical interlock: Two sets of normally closed auxiliary contacts of the circuit breaker are used to realize electrical interlock. On the basis of controller logic interlock, another layer of electrical interlock is added to realize the dual protection of controller logic interlock and electrical interlock.
Tripping fault: when the circuit breaker overflows tripping, the fault output signal controller detected by the circuit breaker will display the alarm of “switch tripping fault”, and switch from the automatic bit to the manual bit, no longer output the closing command. This function avoids the circuit breaker overcurrent trip, re-closing the damage to the circuit breaker.
In the past two years, we have continuously developed bus controller, three-power ATS controller, dual-power bypass controller and so on. we will continue to make efforts to focus on solutions of complex systems, and develop products such as three-line and one-bus, three-line and two-bus, etc. we will continue to update the products according to your valuable advices and requirements for application use are welcomed to improve our product lines.
