Hv Resonant Test System

HV Resonant Test System

HMCXZ-14040kVA/130kV HV Resonant Test System for Cable is suitable for the transfer and preventive test of large-capacity, high-voltage capacitive test products. Taking into account a wide range of applications, the principle of series resonance is used to meet the AC resistance test of high-voltage cables and other capacitor-type samples.

The device is mainly composed of variable frequency control power supply, excitation transformer, reactor, capacitive voltage divider, and compensation capacitor (optional).

The HV Resonant Test System for Cable adopts the method of adjusting the frequency of the power supply to make the reactor and the capacitor under test achieve resonance, and obtain high voltage and large current on the test product. It is a new method and trend of current high voltage test. It has been widely used at home and abroad.

Frequency conversion control power supply, one of the components of HV Resonant Test System for Cable

1. The device has protection functions such as overvoltage, overcurrent, zero start, system detuning (flashover), etc. The overvoltage and overcurrent protection value can be set according to user needs. Taste.

2. The device has three working modes, which are convenient for users to choose flexibly according to the on-site situation and increase the test speed. The working modes are: automatic mode, manual mode, and automatic tuning manual boost mode.

3. Data can be stored and printed in different places. The stored data number is a number, which is convenient for users to identify and find.

4. When the device automatically sweeps the frequency, the starting point of the frequency can be set arbitrarily within the specified range. At the same time, the large LCD screen displays the sweep curve, which is convenient for the user to intuitively understａnd whether the resonance point is found.

5. You can set the first, second, and third stage test voltages, carry out the withstａnd voltage in stages, and gradually check the withstａnd voltage performance of the tested product, which can better meet the requirements of the GIS segmented withstａnd voltage test.

6. The DSP platform technology is adopted, which can easily add or remove functions and upgrades according to user needs, and also makes the man-machine exchange interface more user-friendly.

7. Reactors of the same voltage level and capacity are small in size and light in weight; temperature rise is small when rated load; dry casting is used, with high mechanical strength, good electrical insulation performance, beautiful and reliable.

8. The variable frequency power supply control box has a large capacity margin; strong protection function; good output waveform; good stability; multiple working modes, convenient operation; single-phase 220V or three-phase 380V input power is universal, which is convenient for on-site power supply.

9. Flexible configuration. Different types of reactors can be selected to meet the requirements of different test products, realize one machine with multiple functions and high cost performance.

Capacitor voltage divider of HV Resonant Test System for Cable component

The voltage divider is mainly used in HTCMXZ HVResonant Test System. On the one hand, the voltage divider has the function of high-voltage sampling, on the other hand, it can also realize the airlift with the reactor, so it can be summarized as the following characteristics:

1. High voltage measurement: The voltage divider is composed of 2 parts, divided into high voltage and low voltage parts, and the two are in a certain ratio (referred to as the voltage divider ratio in the system), and the high voltage terminal voltage is proportionally reduced and sampled to the variable frequency source , So as to get the actual voltage of the high voltage end.

2. Airlift compensation: Because it has a certain capacitance, it can achieve resonance with the reactor, which can ensure that the system is airlifted to the rated voltage.

Portable reactor lifting device, one of the components of HV Resonant Test System for Cable

The variable frequency series resonance test device uses the principle of series resonance, uses the excitation transformer to excite the series resonance circuit, adjusts the output frequency of the variable frequency controller, makes the loop inductance L and the test product C resonate in series, and the resonance voltage is the voltage applied to the test product.

The portable reactor hoisting device is a reactor hoisting device with simple structure, convenient assembly and easy operation. The hoisting device includes a bracket, a caster and a pulley assembly arranged at the bottom of the bracket; the pulley assembly includes a fixed pulley and a The pulling device of the traction reactor; the fixed pulley is arranged on the top of the bracket, and the pulling device is installed on the bracket. It can effectively reduce the labor intensity of operators, improve work efficiency and safety, and is conducive to the test of 110kV equipment and the corresponding voltage level withstａnd voltage. At the same time, the reactor hoisting device of the utility model has strong practicability, can reliably and quickly realize the hoisting and stacking or disassembly of a plurality of reactors, which is beneficial to wide application and promotion in the field of electric equipment.

In order to do a better job of series resonance withstａnd voltage test, Wuhan goldhome hipot company launched a special elevator for series resonance, which is suitable for the stack height of 6 reactors and can weigh 150-200kg. The series resonance elevator adopts high-strength and high-quality aluminum alloy material, which has the advantages of beautiful appearance, small size, light weight, balanced lifting, safety and reliability, etc. It is also an indispensable test assistant for series resonance withstａnd voltage test.

The single-group high-strength mast lifting platform has light weight and good maneuverability, and is suitable for single-person operation.

The special guide wheel device between the masts rises and falls smoothly.

The structure is compact, the size of the transportation is small, it can enter the car of the general elevator and can smoothly pass through the door hole and narrow passage.The double-protected outrigger structure makes the work safer and can be lifted close to the working surface.

1、HMCXZ Refers to manufacturer code

14040kVA refers to the maximum rated capacity that the device can output, in kVA

130kV refers to the voltage level that the equipment can output, in kV;

(1) Output voltage waveform distortion rate: <1.0%

(2) Allowable continuous working time: 30 minutes of one-time work under rated conditions, and 60 minutes of continuous work when the cable is withstａnd voltage

(3) The quality factor of the device itself: Q>50

(4) Quality factor under full load during cable test: Q>30 (related to load)

(5) Input power: three-phase 380V/single-phase 220V

(6) Frequency adjustment range: 30Hz～300Hz

(7) System measurement accuracy: 1.0%

(8) The device has protection functions such as overvoltage, overcurrent, and zero start

2、Technical index

（1）Rated voltage：

130kV—Meet 35kV, power system, transformer, insulator, high voltage circuit breaker, GIS AC withstａnd voltage test.

（2）Distortion rate of output voltage waveform：<1.0％

（3）Allowable continuous working time: 30 minutes of one-time work under rated conditions, and 60 minutes of continuous work when the cable is withstａnd voltage

（4）Quality factor of the device itself：Q>50

（5）Quality factor under full load during cable test：Q>30（Related to load）

（6）Input power：three phase 380V

（7）Frequency adjustment range：30Hz～300Hz

（8）System measurement accuracy：1.0％

（9）The device has protection functions such as overvoltage, overcurrent, and zero start

3、Technical parameter

（1）Frequency Power model：CHXB-700kW/380V

Rated output capacity：700kW

Power：three phase 380V，power frequency/50Hz

Output voltage：0 – 400V，single phase/20~300Hz

Rated input current：1063.5A

Rated output current：1750A

Output mave：Sine wave

Voltage resolution： 0.01kV

Voltage measurement accuracy：0.5%

Frequency adjustment range：20 – 300Hz

Frequency adjustment resolution：≤0.1Hz

Frequency stability:0.1%

Running time: continuous under rated capacity60min

Maximum temperature of components under rated capacity for continuous operation for 60 minutes≤65K

Noise level：≤50dB

（2）HV Reactor model：DK-2340kVA/130kV（6set）

Rated Capacity：2340kVA

Rated voltage：130kV

Rated current：18A

Inductance：30H/Single section

e) Inductance error：±5%

f) Quality factor：Q≥50 (f=45Hz)

g) Frequency：30 – 300Hz

h) Package structure：Insulated cylinder oil immersed

i) cooling method：ONAN

j) Highest temperature rise：≤65K

k) operation hours：Rated output current, continuous60min

l) Noise level：≤60dB

m) Hoisting method: ring + hook

（3）Excitation transformer model：JLB-700kVA/3kV/4kV/5kV/6kV/0.4kV

Rated Capacity：700kVA

Inout voltage：400V

Output voltage：3kV；4kV；5kV；6kV

Output current：233.3A；175A；140A；116.7A

Impedance voltage：≤10％

Noise level：≤60dB

Running time: rated output current, continuous60min

Highest temperature rise：≤65K

frequency：30 – 300Hz

cooling method：ONAN

（4）Capacitor voltage divider model：FCR-150kV -1000 pF

a)Rated voltage：150V

b)Capacity：1000pF

c) Frequency：30-300Hz

d) The highest setting value of overvoltage is 1.1 times of the rated voltage

e) When testing non-capacitive samples, it can also be used as a resonant capacitor

f) Dielectric loss of the voltage divider body：≤0.5%

g) Package structure: Insulated cylinder type

h) cooling method：ONAN

i) Highest temperature rise：≤65K

j) Running time: rated output current, continuous60min

k) Noise level：≤60dB

l) measurement accuracy：1.5 level

m)ratio：3000：1

（5）Test line and accessories 1 set

The role of reactor

Since there are many types and different functions, the reactors can be divided into two types from the circuit principle, both in series and in parallel, and their main function is to realize current limiting and filtering. Next, we will talk about the functions of different types of reactors in detail. The specific conditions are as follows:

1. The role of shunt reactor: It has many functions that can change and improve the reactive power-related operating conditions of the power system, and it is often used in reactive power compensation. Simply put, the reactor can improve the voltage distribution on the long transmission line, can absorb the charging capacitive reactive power in the cable line, and the reactor can effectively prevent the generator from self-excitation when the generator has a long line. This resonance phenomenon.

2. The role of the series reactor: under normal circumstances, it is mainly used to limit the short-circuit current, not only that, but also can be connected in series or parallel with the capacitor in the filter, which can limit the power generated in the power grid. High-order harmonics, to be precise, series reactors play a current limiting role.

3. The function of the DC reactor: It is usually installed between the two units of the DC rectifier link and the inverter link in the frequency conversion system. The main purpose is to limit the AC component superimposed on the DC current to a specified value. In this way, it can effectively ensure the continuity of the rectified current and reduce the current pulse value, so that the DC reactor can make the operation of the inverter link more reliable and stable, and at the same time play a role in improving the power factor of the inverter ( The details can be shown in the figure below).

What is the role of reactor? The working principle of reactor two

4. The role of the input reactor: It is mainly used to limit the sudden change of the voltage in the power grid or the current impact phenomenon caused by operating overvoltage, and also when the power supply voltage is smoothed, such as spikes and smooth bridge rectifier circuits. When the phase causes voltage defects and other situations, the input reactor can effectively protect the inverter and improve the power factor, and can prevent the interference from the grid while reducing the pollution of the grid by the harmonic current generated by the rectifier unit.

5. The role of the output reactor: it can play the part of the compensation line, that is, the part of the capacitance from 50 meters to 200 meters, and it can also suppress the output harmonic current to increase the output high-frequency impedance, and suppress DV/DT to reduce high-frequency Leakage phenomenon protects the inverter and reduces equipment noise. When the reactor is in the compensation power state, it is usually impacted by the harmonic voltage and current, resulting in damage to the capacitor and reduction of the power factor. Therefore, it is necessary to control the harmonics during compensation.

6. The function of the current-limiting reactor: relatively speaking, it is much simpler. It is mainly used in the power system. When a fault occurs, it will limit the feeder overcurrent (specifically, as shown in the figure below).

What is the role of reactor? The working principle of reactor three

7. The function of smoothing reactor: It is a very important component for the rectifier circuit. When used in the intermediate frequency power supply, it is mainly used to limit the short-circuit current, that is to say, when the inverter thyristor is performing commutation When the rectifier bridge load is turned on, it is equivalent to a direct short-circuit fault of the rectifier bridge load. Therefore, no reactor is equivalent to a direct short-circuit, and it can suppress the influence of the intermediate frequency component on the power frequency grid.

The filtering function is that when the rectified current has an AC component, the high-frequency AC is different and the rectified output waveform is continuous or intermittent after a large inductance, and the current time is zero. At this time, the inverter bridge Then immediately stop working and cause the rectifier bridge to open. The input power of the parallel inverter circuit has the throughput of reactive components, so the input circuit of the inverter bridge must have a reactor with the effect of energy storage.

What is the role of reactor? The working principle of reactor four

8. The role of the inverter reactor: this type of reactor is generally installed on the input or output terminal of the DC speed controller of the inverter, mainly to suppress the three to five harmonics generated by the inverter. Waves transmit actions to the power grid, and reduce the interference of harmonics caused by frequency conversion to other components. At the same time, it improves the stability of the overall power grid and increases the power factor. In addition, it can also limit the abnormal fluctuation of the grid voltage and the impact on the grid. Current, smoothing the waveform, and reducing the effect on the inverter.

In addition to the above, the inverter reactor has several important functions: firstly, it can achieve the capacitive effect on the light no-load or light-load line, and promote the reduction of the transient overvoltage phenomenon of the power frequency. Secondly, it can improve the voltage distribution on the transmission line and prevent the self-excitation resonance phenomenon that has a certain probability of occurrence with a long line of the generator. Finally, the reactor can play the role of balancing the reactive power in the line as much as possible when the load is light, preventing the improper flow of reactive power from occurring, and reducing the excessive power loss on the line.

9. The role of filter reactor: This type of reactor is often widely used in high and low voltage filter cabinets. When installed, it will form a series connection with the filter capacitor and be tuned to a certain resonant frequency to absorb the power grid. The corresponding frequency harmonic currents appearing in the system, and the elimination of high-order harmonics are harmful to the main transformer or other electrical equipment composed of the system. The filter reactor mainly plays a role in absorbing the harmonics of the power grid, improving the power factor of the system and in terms of safety.

V.Applicable test product

AC withstａnd voltage of cross-linked vinyl cable

Meet the AC withstａnd voltage test of 110kV, 1200mm2, 10000m cross-linked cable, the test frequency is 30~300Hz, the capacitance is ≤2.82uF, the highest test voltage does not exceed 128kV, and the withstａnd voltage is 60min.

2. Reactor selection instructions for withstａnd voltage

(1) The above configuration is a configuration scheme calculated according to the longest cable;

(2) In order to achieve resonance for short cables or test without capacitance, the resonance capacitor is generally incorporated into the loop.

Applications

The series resonance model of 110kV cable AC withstａnd voltage test of 110kV substation: HMCXZ-516KVA/129KV, 110KV test cable 1 group, 100KV cable 800mm2 500 meters long, each group of cables A, B, C three-phase, continuous withstａnd voltage 60min, test The voltage is 128kV. The test results meet the GB 50150-2016 electrical equipment handover test standard. Series resonance completed the AC withstａnd voltage test of Xinfeng 110kV cable, and this test was successfully praised by customers.

The company's products are produced in strict accordance with international and national standards and industry regulations, and have passed the inspections of national, provincial and municipal electric power research institutes, measurement centers and electric power authorities. They have fully passed the ISO9001 international quality management system certification and the People's Republic of China made measuring instruments. License, GB/T19001-2008 quality management system requirements.

We will implement related products and services in strict accordance with the "Quality and After-sales Service Commitment Letter", and we will continue to believe that high-quality, systematic, comprehensive and fast services are the foundation of enterprise development. After years of continuous exploration and progress, we have formed the service concept of "customer as the core and quality as the first life of the enterprise". With the goal of establishing a domestic first-class service enterprise with strict quality management and advanced technology, it has formulated a quality policy of "standardized management system, strict process control, guaranteed product quality, and customer satisfaction", and has insisted on "customer first" for many years. The principle of building a good sales and after-sales service system to provide customers with better pre-sales, in-sales and after-sales services!

Note: The product details are subject to the actual product. Please confirm with the salesperson before purchasing. Please refer to the manual for the specific model parameters.