CN210349492U - Power factor combined resistor - Google Patents
Power factor combined resistor Download PDFInfo
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- CN210349492U CN210349492U CN201920831918.9U CN201920831918U CN210349492U CN 210349492 U CN210349492 U CN 210349492U CN 201920831918 U CN201920831918 U CN 201920831918U CN 210349492 U CN210349492 U CN 210349492U
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Abstract
The utility model discloses a power factor combined resistor, combined resistor's power frequency test voltage is 95kV, applys between ground and resistive element and the copper bar that converges. The combined resistor is composed of two groups of resistors, namely a resistor a and a resistor b, each group of the resistors a is one group, each group of the resistors a is composed of three identical resistor elements a, three phases are shared, and the three resistor elements a can be randomly connected in series and in parallel; each resistor b is provided with one set, each set is composed of two identical resistor elements b, and the resistor elements b can be randomly connected in series and in parallel. The utility model discloses install the power factor resistor in experimental return circuit, the through-flow usefulness of the primary circuit of short circuit transformer high-pressure side, its job features stands the impact repeatedly under the through-flow condition for a short time, greatly improves the efficiency of generator.
Description
Technical Field
The utility model belongs to the technical field of the combined resistor, more specifically say, relate to a power factor combined resistor.
Background
Power factor is an important technical data of an electric power system. The power factor is a factor for measuring the efficiency of the electrical equipment. Power factor
Also called power, is the ratio of active power to apparent power, i.e.
Under a certain rated voltage and rated current, the higher the power factor is, the larger the proportion of active power is, and vice versa, the lower the proportion of active power is.
The significance of improving the power factor is divided into two aspects: when the rated voltage and the rated current of the generator are fixed, the capacity of the generator is the apparent power of the generator. If the generator is operating at rated capacity, the amount of active power output is dependent on the power factor of the load. The lower the power factor, the lower the power output by the generator, and the less fully utilized its capacity. The low power factor causes large voltage drop and power loss on the transmission line. Therefore, when the output power P of the transmission line is constant, the current in the line is inversely proportional to the power factor, i.e. the current is proportional to the power factor
When in use
When the voltage is lower, the current I is increased, the voltage drop on the impedance of the power transmission line is increased, the voltage at the load end is too low, and the normal operation of equipment is influenced when the voltage is serious, so that a user cannot use electricity. Furthermore, the power dissipated across the impedance is proportional to the square of the current, and an increase in current causes increased line loss.
Disclosure of Invention
The purpose of the invention is as follows: the utility model aims at the not enough and defect of prior art, provide a power factor combined resistor, through-flow use at the primary loop of short circuit transformer high-pressure side, its operational feature can stand the impact repeatedly under the condition of short-time through-flow.
The technical scheme is as follows: in order to realize the above purpose, the utility model discloses the technical scheme who adopts is: a power factor combined resistor has a power frequency test voltage of 95kV, and is applied between the ground and a resistance element and between the resistance element and a bus copper bar. The combined resistor is composed of two groups of resistors, namely a resistor a and a resistor b, each group of the resistors a is one group, each group of the resistors a is composed of three identical resistor elements a, three phases are shared, and the three resistor elements a can be randomly connected in series and in parallel;
each phase of the resistor b is provided with one set, each set consists of two identical resistance elements b, and the resistance elements b can be randomly connected in series and in parallel;
the resistor a is GZN-45kV-10kA-0.25 omega-0.6 s, and the resistor b is GZN-45kV-4kA-1 omega-0.5 s.
The resistance value of the resistance element a is 0.25 omega, the effective value of the symmetrical component of the working current is 10kA, the peak value of the working current is 27kA, the effective value of the symmetrical component of the accident current is 15kA, and the peak value of the accident current is 40 kA.
The resistance value of the resistance element b is 1 omega, the effective value of the symmetrical component of the working current is 4kA, the peak value of the working current is 11kA, the effective value of the symmetrical component of the accident current is 6kA, and the peak value of the accident current is 16 kA.
The resistance element a/the resistance element b is electrified with the working current for 0.3s and stops for 3 minutes, and then the working current for 0.6s is used as a cycle, and a cycle test is repeated every 15 minutes for ten continuous cycles.
Has the advantages that: compared with the prior art, the utility model, its beneficial effect is:
the utility model discloses install the power factor resistor in experimental return circuit, the through-flow of the primary circuit of short circuit transformer high-pressure side is used, and its job features stands repeatedly the impact under the through-flow condition for a short time, greatly improves the efficiency of generator.
Drawings
Fig. 1 is a schematic structural diagram of a resistor a.
Fig. 2 is a schematic structural diagram of the resistor element a.
Fig. 3 is a schematic diagram of the structure of the resistor b.
Fig. 4 is a schematic structural diagram of the resistor element b.
Detailed Description
The present invention will be further described with reference to the following detailed description.
A power factor combined resistor is characterized in that the power frequency test voltage of the combined resistor is 95kV, the power frequency test voltage is applied between the ground and a resistance element, the resistance element and a bus copper bar, and the combined resistor is composed of two groups of resistors which are a resistor a and a resistor b respectively.
As shown in FIG. 1, each phase of the resistor a is provided with one set, each set is composed of three identical resistance elements a, three phases are formed, and the three resistance elements a can be randomly operated in series and parallel.
As shown in fig. 3, each phase of the resistor b is provided with one set, each set is composed of two identical resistance elements b, and the resistance elements b can be operated in any series and parallel connection.
As shown in fig. 2, the resistor a is GZN-45kV-10kA-0.25 Ω -0.6s, the resistance value of the resistive element a is 0.25 Ω, the effective value of the symmetrical component of the operating current is 10kA, the peak value of the operating current is 27kA, the effective value of the symmetrical component of the accident current is 15kA, and the peak value of the accident current is 40 kA.
As shown in fig. 4, the resistor b is GZN-45kV-4kA-1 Ω -0.5s, the resistance value of the resistive element b is 1 Ω, the effective value of the symmetrical component of the operating current is 4kA, the peak value of the operating current is 11kA, the effective value of the symmetrical component of the accident current is 6kA, and the peak value of the accident current is 16 kA.
In actual work, the working current is applied to the resistor element a/the resistor element b for 3 minutes, then the working current is applied to 0.6s for one cycle, and a cycle test is repeated every 15 minutes for ten continuous cycles.
The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (3)
1. A power factor combined resistor, the power frequency test voltage of the combined resistor is 95kV, and the combined resistor is applied between the ground and a resistance element and between the resistance element and a bus copper bar, and the power factor combined resistor is characterized in that: the combined resistor is composed of two groups of resistors, namely a resistor a and a resistor b, each group of the resistors a is one group, each group of the resistors a is composed of three identical resistor elements a, three phases are shared, and the three resistor elements a can be randomly connected in series and in parallel;
each phase of the resistor b is provided with one set, each set consists of two identical resistance elements b, and the resistance elements b can be randomly connected in series and in parallel;
the resistor a is GZN-45kV-10kA-0.25 omega-0.6 s, and the resistor b is GZN-45kV-4kA-1 omega-0.5 s.
2. A power factor combining resistor according to claim 1, wherein: the resistance value of the resistance element a is 0.25 omega, the effective value of the symmetrical component of the working current is 10kA, the peak value of the working current is 27kA, the effective value of the symmetrical component of the accident current is 15kA, and the peak value of the accident current is 40 kA.
3. A power factor combining resistor according to claim 1, wherein: the resistance value of the resistance element b is 1 omega, the effective value of the symmetrical component of the working current is 4kA, the peak value of the working current is 11kA, the effective value of the symmetrical component of the accident current is 6kA, and the peak value of the accident current is 16 kA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920831918.9U CN210349492U (en) | 2019-06-04 | 2019-06-04 | Power factor combined resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920831918.9U CN210349492U (en) | 2019-06-04 | 2019-06-04 | Power factor combined resistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210349492U true CN210349492U (en) | 2020-04-17 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920831918.9U Active CN210349492U (en) | 2019-06-04 | 2019-06-04 | Power factor combined resistor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210349492U (en) |
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2019
- 2019-06-04 CN CN201920831918.9U patent/CN210349492U/en active Active
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