MC-5000R Capacitive Equipment Live Tester

Model: MC-5000R Quantity: 1 set Manufacturer: Hubei MECI Electric Power Equipment Co., Ltd

Category: Capacitors and Generators

Keywords: MC-5000R Capacitive Equipment Live Tester

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Product Overview

There are typically two methods for monitoring the insulation condition of high-voltage electrical equipment in substations: online monitoring and live (portable) on-line testing.

Online monitoring enables continuous acquisition of characteristic parameters that reflect insulation abnormalities in equipment, facilitating automated management; however, it requires a relatively large capital investment, involves complex installation and commissioning, and necessitates regular maintenance. In contrast, portable live-line testing offers advantages such as lower investment, high specificity, and ease of installation, maintenance, and system upgrades. By pre-installing sampling units or clamp-on sampling sensors on electrical equipment, portable live-line testing instruments can be used to conduct routine inspections of equipment in service, thereby promptly identifying insulation defects and extending the interval between outage-based preventive tests—effectively replacing the more costly online monitoring approach. The HK-5000R testing system, encompassing both the sampling unit and the testing instrument, significantly outperforms previous systems in terms of both technical performance and user-friendliness; earlier sampling units posed safety risks, while the testing instruments were cumbersome to operate and lacked the capability for seamless integration into online monitoring systems.

The HK-5000R Capacitive Equipment Live-Testing Instrument features a completely new design and architecture that effectively addresses the shortcomings of existing live-testing systems. It offers a wide range of testing functions: it can perform online or de-energized measurements of dielectric loss and capacitance in capacitive equipment, as well as tests for the resistive current parameters of zinc oxide surge arresters. Primarily, it is used for real-time online monitoring of key parameters such as capacitance and dielectric-loss values, end-screen currents in operating transformer bushings, CTs, CVTs, and coupling capacitors, as well as total current, resistive current, and capacitive current in surge arresters, thereby enabling accurate assessment of the insulation condition of these devices.

Product Features

  • A high-precision external core-piercing current sensor or clamp-on sampling sensor is employed to replace the conventional “sampling protection unit” (which comprises multiple switching circuits used during testing to route the end-screen current to the test instrument; this arrangement poses a risk of end-screen open-circuiting and requires manipulation of several shunt links to connect the end-screen current to the test equipment). The sampling unit utilizes a core-piercing sensor design, installed in close proximity to the equipment, eliminating any breaks in the end-screen lead and minimizing lead length, thereby fundamentally eliminating safety hazards such as end-screen open-circuiting. This sensor can accurately measure input signals in the range of 100 μA to 1000 mA. With its low input impedance, the sensor can withstand the effects of a 10 A power-frequency current as well as the surge from a 10 kA lightning strike, meeting the requirements for online monitoring applications.
  • The sensor features a die-cast aluminum housing with a sealed, waterproof design, and its secondary output is connected via a waterproof cable connector, ensuring convenient test connectivity. Once the sensor is installed, it remains de-energized under normal operating conditions; to perform testing, simply connect the sensor’s secondary cable, enabling “plug-and-play” operation without any additional manipulation of the末屏 signal leads.
  • The core processor of the monitoring instrument is a 32-bit floating-point high-performance digital signal processor (DSP) manufactured by Texas Instruments (TI) in the United States, coupled with an external 16-bit, high-speed, multi-channel synchronous analog-to-digital converter (A/D) to enable real-time measurement and high-precision computation of monitored parameters. The system is capable of simultaneously monitoring multiple devices.
  • Two online dielectric-loss measurement modes are provided: one enables the measurement of the dielectric-loss difference and capacitance ratio between two in-phase capacitive devices, while the other uses the PT secondary-side voltage as a reference signal to measure the device’s capacitance and dielectric-loss value. By employing self-compensating high-precision current sensors and advanced digital-filtering techniques, the system effectively addresses the challenges of measurement accuracy and stability in dielectric-loss testing. Combined with comprehensive electromagnetic shielding and state-of-the-art digital filtering, the system ensures that dielectric-loss test results remain unaffected by harmonic and pulse interference, achieving an absolute measurement accuracy of up to ±0.05%.
  • The addition of detection functions for the dielectric-loss difference and capacitance-ratio values of in-phase capacitive equipment not only avoids distortion of dielectric-loss test results caused by using the PT secondary-side voltage as the reference signal, but also helps to mitigate the impact of interphase electric-field interference.
  • The tester is equipped with a 320×240 LCD display for showing parameters such as voltage, current, dielectric loss, resistive current, and capacitive current.
  • It can record all monitored parameters and continuously monitor and store data from up to 255 devices.
  • When testing with a zinc oxide surge arrester or using the voltage method, simply connect the PT voltage lead; no protective resistor is required.
  • This system employs external sensors or clamp-on sampling sensors—referred to as the “Sampling Protection Unit”—which enable a seamless transition from “live-line testing” to “online monitoring” while the equipment remains in normal operation. During the upgrade, there is no need to remove the installed sensors or shut down the equipment; simply add the monitoring unit (IED).
  • The detector features a portable design for easy operation, and its built-in lithium battery provides up to 8 hours of continuous operation, fully meeting the requirements of field use.

Technical Specifications

(1) Current Mode

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Current measurement range

 

1 mA to 1000 mA RMS, 50 Hz / 60 Hz

Current ratio accuracy

 

±Reading × 0.5% + 10 µA

Phase angle measurement range

 

0.000~359.999°

Phase angle measurement accuracy

 

±0.023° or dielectric loss ±0.04% (excluding magnetic field interference)

Capacitance Ratio Measurement Range

 

1:10,000 to 10,000:1 (4-digit display)

Capacitance Ratio Measurement Accuracy

 

±(0.5% of reading + 5 digits)

Dielectric Loss Measurement Range

 

Tanδ = −200% to 200%, with a minimum resolution of 0.001%.

Dielectric Loss Measurement Accuracy

 

±(0.5% of reading + 0.0004)

(2) Voltage Method

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Voltage measurement range

 

1–300 V

Voltage measurement accuracy

 

±(0.5% of reading + 10 mV)

Measurement range

 

3 V to 300 V RMS, 50 Hz / 60 Hz

Input resistance

 

200 kΩ

Phase angle measurement range

 

0.000~359.999°

Phase angle measurement accuracy

 

±0.023° or dielectric loss ±0.04%

Capacitance measurement range

 

10 pF to 0.5 µF

Capacitance measurement accuracy

 

±(0.5% of reading + 1 pF)

Dielectric Loss Measurement Range

 

Tanδ = −200% to 200%, with a minimum resolution of 0.001%.

Dielectric Loss Measurement Accuracy

 

±(0.5% of reading + 0.0004)

(3) Measurement Method for Zinc Oxide Surge Arresters

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Full current measurement range

 

0~100 mA RMS

Full-current measurement accuracy

 

±(Reading × 5% + 5 µA)

Resistive Current Measurement Range

 

Irp = 10 μA to 100 mA

Measurement accuracy of resistive current

 

Measurement accuracy: ±(5% of reading + 5 µA)

Capacitive current measurement range

 

Icp = 100 µA to 1000 mA

Capacitive Current Measurement Accuracy

 

Measurement accuracy: ±(5% of reading + 5 µA)

Phase measurement range

 

0.000~359.999°

Phase measurement accuracy

 

±0.1°

Frequency Measurement Range

 

45Hz-65Hz

Frequency measurement accuracy

 

±0.5 Hz

(4) Core Grounding Current Measurement

 

 

Current measurement range

 

Range: 0–1 A; Minimum resolution: 0.01 mA;

Core current measurement accuracy

 

Core grounding current measurement accuracy: ±(0.5% of reading + 0.1 mA)

(5) Other parameters

 

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Sampling Method for Capacitive Equipment

 

1. The voltage reference side supports two modes: )

A. Sampling from the PT secondary side B. Sampling from the end screen of capacitive equipment

Arrester Sampling Method

 

The base of the zinc oxide surge arrester on the test side is short-circuited, and sampling is performed directly at the upper end; the sampling device is required to have on-site anti-interference performance.

Data stabilization time

 

10s

Battery operating time

 

6 hours (lithium-ion battery)

Charging power supply

 

AC 220V, 50Hz / 60Hz

Other Features

 

Includes a built-in microprinter for printing measurement results; features an RS-232 interface.

MC-5000R Capacitive Equipment Live Tester

MC-5000R Capacitive Equipment Live Tester

Model: MC-5000R Quantity: 1 set Manufacturer: Hubei MECI Electric Power Equipment Co., Ltd

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Tel： 86-13307164232

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