CMTS inverter performance test system

Inverter load test system

An overview.

At present, many domestic manufacturers of the inverter load testing system mostly adopts the traditional way - - excitation motor commissioning, especially power consumption, and easy to heat damage excitation. With the increasing application of market of the high power converter more widely, there are increasingly high requirements, not only the product function to be rich, but to reliable quality. The inverter power is very sensitive to temperature, especially the inverter module temperature control is one of the most important indexes in the whole frequency stability test, the only means of detecting temperature is corresponding with the rated current of power, has reached the required test. But with the production of power is increased at the same time, the power transformer also increased, which brings a lot of investment to the enterprise, and every year to pay a sum of not a small capacity fees, at least tens of thousands, many hundred thousands of, all the year round utilization rate is not high; so how can not increase power supply capacity and can solve the high power converter debugging problems Many companies are hoping to find a more reasonable economic inverter load test system!

Here is a inverter load test system, three-phase asynchronous motor load test system uses a common bus and motor - feedback principle, energy saving rate is currently one of the highest load test system (energy saving rate is more than 80%); the load test and inspection is mainly applied to the inverter, but also can provide some data for the inverter manufacturers reference; includes voltage current power temperature, convenient and timely improve the products manufacturers.

Two. The system performance characteristics

Load part 1 of this system consists of several groups of three-phase AC asynchronous motor, with the load test of large capacity, convenient installation, power may be increased to hundreds of kilowatts, each power segment covering the basic inverter, due to the adoption of the three-phase asynchronous motor, with high reliability, simple maintenance etc.. The motor has simple installation method (below), motor with two identical power cross docking, formation of drag - feedback self circulation control feedback mode, by changing the slip ratio of the motor to change the magnitude of the load current, full load the test frequency converter working in real.

Part of the common bus system feedback 2 energy, measured consumes most of the energy converter is composed of feedback (power generation) motor feedback provides good, after the actual test results show that the frequency converter, energy consumption accounted for only actual measured power of 15%--20%, saving rate reached 80%, energy-saving effect is very significant, long-term use, companies can save a substantial amount of electricity; the system not only saves electricity load test, but also greatly reduce the installed capacity of power supply and distribution system (transformers), frequency converter with 380V/315KW testing, as long as the power transformer power transformer configuration 80-100KVA capacity will meet the requirements, enterprises can save a lot of investment; this is not exciting loading system this match.

3 integration design, test system in the past have feedback unit (compound excitation converter), test system, platform independent display, connect the entire system through a cable, not only a waste of space, but also is not beautiful, I now do the improvement based on the original, the design concept of integration the feedback unit, (compound excitation converter), direct embedding operation in the system cabinet, making the appearance more reasonable, but also improves the stability of the system, reduces the land area of the system.

Fig. 1 motor docking

Fig. 2 the appearance of the product graph

Three, the system configuration

1 the subjects of inverter

2 load with negative excitation converter

3 asynchronous motor generator

4 measuring unit and the discharge unit

5 power management system

Four, investment and economic analysis

An annual output of 1 tens of millions of enterprises: according to the average 1KW / 200 yuan calculation,

Power consumption of 1 year =1000 million / 200 yuan =5 million KW, the current 380V electricity is 1 yuan about /1 degrees, so a year of electricity is 50000 yuan, so can save electricity 50000 * 80%=4 million.

Secondly, the annual savings of transformer loss cost several million (general transformer capacity greater than 150KVA charge loss cost, power is greater the higher the charges, and every place is different), the investment cost plus the transformer itself; the whole year for companies to save the cost of not less than 100000 yuan, has the very good economic benefit.

Five, function and technique index

(1) system

1 system can carry on the full load test, no-load test, temperature test, temperature rise test, overload test on low voltage frequency converter.

2 system to the three-phase input / detection of the inverter output voltage, current, power, power factor, voltage and other commonly used data.

3 overvoltage, undervoltage protection, over-current, short phase protection.

(2) technical indicators:

1 energy saving target:

Energy saving 80% to 85%

2 power range:

3.7-315KW

3.7-315KW

3.7-400KW

3.7-400KW

3.7-500KW

3.7-500KW

The 3 voltage measurement

Voltage measurement accuracy: + 0.2%

Voltage display accuracy: 1 decimal places

4 current measurement

Current measurement accuracy: + 0.2%

Current test range: depends on the current transformer

The current display accuracy: 1 decimal places

5 power factor measurement:

Power factor measurement accuracy: + 0.5%

Power factor accuracy: 1 decimal places

Attached: frequency