HDYZ-E zinc oxide arrester live tester measures MOA wiring method

The zinc oxide arrester live tester is used to detect the electrical performance of each phase of zinc oxide arrester (MOA). The instrument is suitable for on-site live testing of zinc oxide arresters of various voltage levels and factory and acceptance tests done in the laboratory under power outage conditions. By measuring parameters such as total current and resistive current, dangerous defects such as internal insulation moisture and valve aging of zinc oxide arresters can be discovered in a timely manner.

HDYZ-E zinc oxide lightning arrester live tester test test wiring

1. Notes

1 The instrument host and voltage collector must be reliably grounded before testing.

2 Current sampling: for single-phase testing, input from the A phase (yellow) channel of the instrument host; for three-phase testing, input from the A, B, and C phase (yellow, green, and red) channels respectively; and the instrument can only be used for low-voltage and low-current signal sampling, so the test line should be kept away from high voltage.

Tip: Take the current from the zinc oxide lightning arrester counter. When the test clip is well connected, the counter ammeter pointer returns to zero. If the ammeter pointer does not return to zero, it means that the test clip is not connected properly. At this time, rub the test clip on the connection several times to return the ammeter pointer to zero.

3 Reference voltage sampling: for single-phase testing, input from the A phase (yellow) channel of the voltage collector; for three-phase testing, input from the A, B, and C phase (yellow, green, and red) channels respectively; a 120mA self-recovery fuse is connected in series on the voltage test line to prevent the test line from short-circuiting and causing a short-circuit on the PT secondary side.

4 Inductive test mode, the inductive plate must be placed on the base of the B-phase zinc oxide arrester and input from the reference signal channel of the instrument host; and the inductive plate must be placed perpendicular to the B-phase zinc oxide arrester.

5. For wireless testing, the voltage collector should be placed in a relatively high position (for example, above the PT terminal box) to increase the wireless transmission and reception distance. When the wireless signal is weak, the antenna direction can be adjusted appropriately to enhance the wireless signal strength. In special cases, a suction cup antenna with an extension cable can be used to improve the wireless signal quality.

3 Wired test method wiring instructions

 3.1 Reference voltage measurement

3.1.1 Reference voltage input range: 25V~250V effective value, 50Hz/60Hz

3.1.2 Reference voltage measurement accuracy: ± (reading × 2% + 0.2V)

3.1.3 Voltage harmonic measurement accuracy: ± (reading × 5%)

3.1.4 Reference voltage channel input resistance: ≥1500kΩ

Current measurement

3.2.1 Full current measurement range: 0~20mA effective value, 50Hz/60Hz

3.2.2 Accuracy: ±(reading×2%+5uA)

3.2.3 Resistance current fundamental wave measurement accuracy: ± (reading × 2% + 5uA)

3.2.4 Current harmonic measurement accuracy: ± (reading × 5% + 10uA)

3.2.5 Current channel input resistance: ≤2Ω

Electric field strength measurement

3.3.1 Electric field strength input range: 30kV/m～300kV/m

3.3.2 Electric field strength measurement accuracy: ± (reading × 10%)

3.3.3 Electric field harmonic measurement accuracy: ± (reading × 10%) Figure 18 Wiring diagram of wired test method (three-phase simultaneous measurement)

The wired test method requires the use of a communication cable to connect the instrument host and the voltage collector, and to perform data transmission and synchronization via wired means. The wiring diagram is shown in Figure 18.

When wiring, the current and voltage phase sequence must be connected in the correct phase sequence. The instrument host is set to wired test mode, and the voltage collector is set to wired transmission mode.

4 Wireless test wiring instructions

Wireless test mode The instrument host and voltage collector transmit and synchronize data via wireless communication. The wiring diagram is shown in Figure 19.

Figure 19 Schematic diagram of wireless test wiring (three-phase simultaneous measurement)

5 Induction test wiring instructions

Figure 20 Schematic diagram of induction test wiring (three-phase simultaneous measurement)

The induction test method does not require a voltage collector, and the instrument host completes current sampling and induced electric field sampling. The induction plate should be placed on the base of the B-phase lightning arrester, and the placement position should be symmetrical with the A and C-phase lightning arresters, and the induction plate should be perpendicular to the B-phase lightning arrester; the wiring diagram is shown in Figure 20.