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LSM672N load distribution module

LSM672N load distribution module

  • publish:2014-02-18 11:07      Browse:
  • Type:    LSM672N
  • Product Summary:
  •        Functional load distribution module in the system frequency is constant, the load allocated to each local generators . As a part of the electronic control system , LSM672 active power detected current, and interconnected via a parallel cable , the control system continuously . Terminal "N" is used to connect the star generator, the third harmonic is used to weaken the load and the load distribution of the error......

Description
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Product description:

       Functional load distribution module in the system frequency is constant, the load allocated to each local generators . As a part of the electronic control system , LSM672 active power detected current, and interconnected via a parallel cable , the control system continuously . Terminal "N" is used to connect the star generator, the third harmonic is used to weaken the load and the load distribution of the error between the units . By adjusting the load distribution unit has slip and power control connections, the load distribution on the common trunk . Except the assignment function , this unit further comprises an adjustable positive power or reverse power monitor . When a reverse power condition or the arrival of a positive power limit , the relay will be closed. Load unit further includes a single or a desired circuit and to optimize transient machine .

 

Main  features:

Generator set with synchronizer can accurately maintain the set speed. If the band 's generators and synchronous machines to increase the total power output , you need a system that is responsible for sharing the load. In each unit and machine , run the best little change in the frequency of the generator set , while the other unit output power will change . For this reason, this unit will increase the output power , the unit will reduce the output power of the other . This situation will eventually lead to some of the unit towed machine . Load distribution unit continuously adjusts the speed governor set , thus eliminating the differences in average power . Synchronizing torque by an electric generator to be locked together as tightly connected together via a gear transmission .
Collection network load distribution unit power . There are two three-phase voltage input range, can include almost all types of power generation applications ( see specifications in the table ) . In the design of multi-phase generator , the third harmonic is inevitable . This odd harmonics may cause errors in the load distribution terminal N should be connected electrically neutral position of the star in the generator .
By gathering line current transformer , and connect the ammeter . Each transformer is only 6.25VA the extra load . Increase the damping line will increase the load. For example , the line will increase 0.1Ω damping burden 2.5VA transformer 's .
The signal generated by the power measurement circuit a parallel cable insulation . Power distribution by size and sensitivity sensitivity potentiometer on the front panel to adjust. Potentiometer down test points used to measure the polarity and magnitude of the signal. When you first install and repair system, which is useful both test points . For the three-phase system , the signal voltage from 0 to 7.5V represents the load to full load (5A transformer ) . Sensitivity potentiometer adjustment range from 0 ~ 7.5VDC. Parallel cable to the parallel generators . When the relay is closed , the load signal of each unit will be transferred to a common point . With the cable connection , the current in the cable will be proportionally distributed to the unbalanced generator ( non-equilibrium phenomena such individual LSM is detected, sends a correction signal to each of the turbine to reduce the error ) . Parallel cable must be shielded cable.
Desired characteristics of the load ( duty pulse ) also generates a signal , derived from a function . Load adjustment potentiometer clockwise to increase the generator load expect responsiveness to change . For convenience, the load distribution unit includes a positive power , reverse power monitor. When the reverse power is built into the circuit perception , built 10A contactor will close , LED light will light on the front panel display reverse power conditions. For the circuit , this transition point is adjustable , the adjustable range of 0.5 % to 20% of the reverse power . Set the time delay of 2 seconds in the cell reversal .
Has positive power "ON", "OFF" is set two potentiometers , each independently adjustable . Including insulation 10A normally open relays and LED lights to display the relay is closed . Adjust potentiometer clockwise transition range can be changed from 20% to 100 %. Clockwise "OFF" potentiometer transition range can be changed from 0 to 80 %. There must be a 20% difference in the "ON" "OFF" point . ( All percentages are based on the 5A load current transformer unit power factor = 100% load ) . Monitor contains a positive power of two seconds time constant and can be manually reset.
5.1VDC voltage reference is used to match the load distributor with a different governor. For all GAC controller factory settings are 5.1V.

 

Specifications:

Performance
            Load distribution - adjustable range is ± 2% between the units ;
            Performance - or worse mode and synchronous machines, power control ;
            Reverse-phase power monitoring - Adjustable range : 0.5 ~ 20% 2s reverse delay ;
Positive phase power monitoring - "ON" trip point adjustable range: 20 to 100% ;
"OFF" trip point adjustable range: 0 to 80% ;
Normally open contact 2 seconds to reverse delay;
Power output signal - 0 ~ 7.5VDC (0 ~ 100% LOAD);
The above argument is based on the 5A current transformers , full load, consistent power factor .

Power Input
AC input signal - between nominal line voltage : 208V 416V; 5A current transformers ; 6.25VA level ; built- 0.25Ω resistor. Line voltage : HZ LOW RANGE HIGH RANGE
50 140 ~ 250VAC 260 ~ 420VAC
60 170 ~ 260VAC 340 ~ 500VAC
400 170 ~ 260VAC 340 ~ 500VAC
DC power supply - 18 ~ 36VDC ( overvoltage and reverse voltage protection ); 12VDC - LSM672-12
Polarity - negative ground ( electrical isolation ) ;
DC power consumption - continued 70ma;


Inter- Model LSM672-C line voltage 120V AC voltage input
           LSM672A-1 0 ~ 7VDC forward power 0 ~ 2VDC reverse power
           LSM672-1

 

 

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