PZG Intelligent Fault Passage Indicator

The PZG series distribution line fault locating system does much more than a standard fault passage indicator. It comprises three acquisition units (one per phase), and a pole-mounted collection unit, it is installed on distribution lines to measure current and voltage. It operates as a distribution automation master station during the regular operation of distribution lines and detects overcurrent and earth fault. During normal operation it provides, real-time values of the operating parameters giving the status of the system. In the event of a fault, the system gives a visible, flashing indication of the passage of fault current, whilst collecting data to locate the fault and saves waveforms in Comtrade format for subsequent analysis. It will also monitor and provide measurements of current and voltage.

This data can then be used for automated fast supply restoration, or can be transmitted to a remote master station for appropriate action to be taken. The acquisition units are self-powered from the current on the line (>4A).

These are backed-up with a super-capacitor and a lithium ion battery to ensure that the equipment continues to operate under all conditions. The collection unit is powered from a solar panel with a rechargeable lithium battery as back-up.

The PZG series of distribution line fault location device is ideal for 6kV- 35kV distribution networks, including those with unearthed neutral points, arc suppression coil earthing and systems with low resistance earthing.

Low current earth fault detection

In addition to giving data concerning system disturbances, the PZG can identify difficult to detect occurrences, such as low current faults which may be as a result of dangerous situations such as downed conductors.

If such a high resistance earth fault occurs, the current may be insufficient to be recognised as a fault. In this case, the faulty section can be identified from the direction of the transient zero-sequence currents which the collector unit can extract from the currents measured by the line-mounted acquisition units. These will have opposite polarities at either end of the faulty section, and the amplitude and waveform are different. In contrast, the transient zero-sequence currents of the healthy sections have the same polarity and similar amplitudes and waveforms.  Hence, the master station can identify the section in which the fault has occurred.

Wireless Acquisition Unit (Line Mounted)

Rated operating frequency 50/60Hz
Rated operating voltage ≤35kV
Fault indication Red LED; flashing period: 5s, lighting time ≤ 50ms; 360° omnidirectional.
Visible distance 200m during the day; 500m at night
Reset time Power-on automatic reset time: <5min. Timing reset time: can be set (48h, minimum resolution 1min)
Accurate current measurement (Line current) 4 – 600A (Maximum measured current 1200A)
measurement accuracy 4-300A:±3A,300-600A:±1%
Recording length 12 cycles, 80 points / power frequency cycle
Cyclic storage 64 groups, following the Comtrade standard
Accurate current measurement (Line current) 5 – 600A (Maximum measured current 1200A)
Self-powered operation > 4A load current
Non-rechargeable battery 3.6VDC,8.5Ah
Super capacitor capacity Independently maintain full-featured operation when fully charged ≥12h
Power consumption Minimum average operating current ≤ 80uA
Overhead line cable diameter 8-32mm (∅)
Horizontal tension >50N
Dimensions 118mm × 176mm × 118mm (width × height × depth)
Weight 0.85kg
Loading and unloading life >50 times without damage
Mechanical strength (earthquake, drop, vibration) Vibration level I, tilt drop 1m
Ingress protection level IP67
Operating humidity 5-100%
Operating temperature -40 to +70℃

Collection Unit (Pole Mounted)

Rated input voltage 15VDC, ±20%; 20W (solar panel) or alternatively60VAC, ±20% (line power/voltage device)
Backup power 7Ah/12V (Lithium battery)
Power consumption <0.2VA (online, with no communication)
4G/3G wireless communication Single-way Serial
Serial port 1, EIA/RS232 (1200~19.2kbps)
Wireless access to acquisition units 3 groups, 3 units per group
Micropower wireless communication 433 – 470MHz,≤10mW(10dBm)
Communication distance <20m
Electromagnetic compatibility IEC standard level IV
Dimensions 338mm × 179mm × 102mm (width × height × depth)

PZG-200J Installation:

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