ZR20 series resistor capacitor overvoltage absorberDetailed product description：

ZR20 series resistor capacitor overvoltage absorber
Model:
ZR20-7.2(12)-0.10/100,ZR20-40.5-0.05/100

Introduction:
ZR20 resistor capacitor overvoltage absorber is a new high-tech product. This product is developed to meet the GB/T2900.16-1996 capacitor standard, known as the "protective capacitor", used as a high-voltage capacitor for absorbing impulse voltage. It is connected in series with a non inductive resistor and then connected between the load side of the switch and the ground. It can effectively suppress the instantaneous oscillation and high-frequency current of the operating overvoltage, making the waveform of the overvoltage slow down, the steepness and amplitude reduced. In addition, the damping effect of the resistor quickly attenuates the high-frequency oscillation. It is very effective for any type of load equipment, preventing insulation damage caused by overvoltage during operation and ensuring safe operation of electrical equipment.
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ZR20 series resistor capacitor overvoltage absorber

1、 Product Usage
In the medium voltage field, vacuum switch equipment (such as vacuum circuit breakers, vacuum load switches, vacuum disconnectors, and vacuum reclosers) has the advantages of small size, light weight, high performance, high reliability, easy maintenance and repair, and suitability for frequent operation. Therefore, it quickly occupied the market It has been widely used in various fields, especially in the medium voltage field in China, where the majority of the switchgear used is vacuum switchgear.
However, vacuum switchgear, due to its strong arc extinguishing ability, is prone to overvoltage during operations such as current interruption, multiple flashovers, and synchronous disconnection when disconnecting loads from motors, transformers, reactors, and capacitors.  
With the increasing importance of stable and safe power supply in the power system. The requirements for improving system reliability and security are becoming increasingly stringent. Overvoltage operation poses a great danger. It greatly affects the stability of the system. Reliability and safety. Therefore, it must be developed. Develop and produce new overvoltage protection devices to meet the above requirements.
The ZR20 type resistive capacitive overvoltage absorber is a brand new high-tech product that can fully meet the above requirements. This product is a specialized capacitor called a "protective capacitor" (a capacitor connected between the power line and the ground to absorb surge overvoltage), which is connected in series with a resistor and then connected between the load side of the switch and it. It can effectively suppress the instantaneous oscillation and high-frequency current of the operating overvoltage, and make the waveform of the overvoltage gentler, steeper, and lower in amplitude. In addition, the electric damping effect and rapid attenuation of frequency oscillations are used Very effective for any type of load equipment It is to prevent insulation damage to electrical equipment caused by overvoltage during operation An ideal overvoltage protection device that is essential for ensuring the safe operation of electrical appliances

2、 Product model and significance



3、 Product features
The ZR20 type resistive capacitive overvoltage absorber has passed all type tests in the National High Voltage Apparatus Quality Supervision and Inspection Center and the High Voltage Apparatus Laboratory of Xi'an High Voltage Apparatus Research Institute. This product uses a dry-type high-voltage capacitor with self-healing function, which is truly a "protective capacitor". Its insulation level fully meets the requirements of GB311.1Un and 1.5Ln for long-term operation, and there is no flashover or breakdown after 4 hours of connected operation at 2Un. Safe operation under temporary voltage (including power frequency voltage rise, resonant overvoltage, single-phase grounding short circuit, and intermittent) arc grounding overvoltage.
The ZR20 type resistor capacitor overvoltage absorber has undergone multiple overvoltage absorption performance tests in the laboratory, which have shown that it can absorb standard lightning impulse voltage after passing through the resistor capacitor overvoltage absorber. This voltage drops very low. Generally not exceeding twice the peak value of the relative ground voltage. According to the on-site test data provided in the article "Research on Vacuum Circuit Breaker Switching Parallel Reactor Test" published in the 4th issue of Guangdong Electric Power in August 2003, the circuit breaker is divided into
When the gate is connected, the overvoltage when connecting zinc oxide lightning protection is 3.48 times, and when connecting resistance capacitance overvoltage absorption, it is recommended to install resistance capacitance devices again. This device can reduce both the amplitude of overvoltage and the frequency of voltage. It can be seen that the impedance capacitance overvoltage absorber is the most ideal and effective device for protecting various electrical equipment from damage caused by overvoltage during operation
4、 Technical parameters
The technical parameters of ZR20 type resistive capacitive overvoltage absorber are listed in the following table



Note: The accepted 1mm power frequency withstand voltage is 75% of the factory test voltage.

5： Usage conditions
1. Environmental air temperature: -20 ℃ -40 ℃
2. Altitude:<3000M
3. Relative humidity:<95% (at 20 ℃)
4. The air in the installation site should not contain chemically corrosive gases and vapors, non-conductive and explosive dust.
5. Earthquake intensity not exceeding 8 degrees
6. Rated frequency 50HZ or 60HZ
If the high-order harmonics of the system exceed the requirements of GB/T14549-93, it should be explained when ordering.
6、 Instructions for use

1. ZR20 type resistor capacitor overvoltage absorber is connected to the lower end of the current transformer of the circuit breaker outlet
The closer the protected electrical equipment is to the ground, the better the effect. For specific wiring, please refer to the wiring schematic diagram.
It is recommended that if the previous stage does not have a resistor capacitor overvoltage absorber installed, a resistor capacitor overvoltage absorber should also be installed on the incoming side of the circuit breaker.

2. The capacity of the ZR20 type resistor capacitor overvoltage absorber protection motor is 100-10000KW
The capacity of the protective transformer is 100-45000KVA, and the capacity of the protective capacitor is 1000-10000Kvar.

7、 Appearance and installation dimensions



8、 Transportation and Storage
1. ZR20 type resistive capacitive overvoltage absorber is packed and transported.
2. During transportation, it should be protected from rain, handled with care, kept upright, bumped, and dropped.
3. When stored, it should be kept in an upright position, with an air temperature range of -20 ° C to 40 ° C, and no flammable or explosive gases or corrosive chemicals are allowed.
9、 Acceptance and installation
1. Check the appearance quality of the impedance capacitance overvoltage absorber and the condition of the metal accessories.
2. Measure the capacitance, tan δ, and resistance values with an electric bridge to see if there are any changes from the factory values.
3. The 1-minute power frequency withstand voltage test shall be conducted at 75% of the factory test value, or a direct current voltage (twice the power frequency withstand voltage value) test can be used. During the experiment, single-phase voltage should be applied, and the other two phases should be grounded together with the grounding point. After the experiment is completed, it must be fully discharged until it is completely discharged.
4. It is best to use single or multiple copper wires for installation, and excessive tension should be avoided on the impedance capacitance overvoltage absorber. The cross-sectional area of the wire is 7.2KV and 12KV>4mm2.40.5KV>6mm2. The areas marked with grounding symbols should be reliably grounded, and the carrying surface of the grounding wire should also meet the above requirements. If a single-phase structure is used, the net distance between the charged bodies and the ground during installation should be 7.2KV>100mm, 12KV>125mm, and 40.5KV>325mm.
5. The resistor capacitor overvoltage absorber should be installed vertically upwards, and other installation forms should be specified when ordering.

10、 Usage and maintenance
1. The resistance capacitance overvoltage absorber is a maintenance free equipment. When it is removed or inspected after use, it must be fully discharged until it is completely discharged, otherwise it will endanger personal safety.
2. The resistance capacitance overvoltage absorber must undergo a preventive test once a year, and the withstand voltage test can use either power frequency or DC. The test voltage and acceptance test are the same. Measure the capacitance and tan values of capacitors (excluding resistance) using a bridge to compare with factory data. The manufacturing plant provides consulting services at any time. Practice has proven that accidents are caused by failure to conduct preventive tests in accordance with the requirements of this article, and therefore it is particularly emphasized that they must be carried out.

11、 Methods for diagnosing faults
The capacitance and tan values of the capacitance part of the impedance capacitance overvoltage absorber are measured using a high-precision capacitance bridge when the absorber is put into operation. When conducting preventive tests, the same bridge should be used to measure the capacitance and tan values. And compare with the previous measurement value to see if there is any change. If the capacitance of the 40.5KV product increases by 2.5% and the capacitance of 7.2KV and 12KV increases by more than 5%, it indicates that there is an internal fault in the capacitor and it should be replaced in a timely manner. If the measured tan&value increases significantly, it should also be replaced.
When conditions permit, a withstand voltage test can also be conducted, using either power frequency withstand voltage or DC withstand voltage. The withstand voltage value should be the same as the acceptance test, and there should be no flashover or breakdown during the test before continuing to operate. Otherwise, it must be replaced.
12、 Ordering Notice
1. When placing an order, the voltage level and quantity of the product used must be specified.
2. Please indicate the model of the switchgear where the product is installed and the name and capacity of the protected equipment when placing an order.
3. If there are special requirements, please specify them when placing an order.