Test Procedure; Testing The Off-Circuit Condition; Current And Voltage Tests - ABB UniGear ZS1 Instruction Manual

6.3 Test procedure

Figure 132: Withdrawable part during insertion into the
service position, shutters not yet fully open
4.2 Contact arm, with insulating sleeve
4.3 Contact system
5 Isolation tulip
12.1 Top shutter
12.2 Lower shutter
82

6.3.1 Testing the off-circuit condition

In switchgear panels which are not equipped with capacitive voltage indication, checking the off-circuit
condition is carried out with a HV tester on the isolating contacts 4.1 (figure 133) in the isolating tulips
5 (figure 132), after the corresponding upper shutter 12.1 or lower shutter 12.2 has been opened.
Shutter opening can be carried out by means of module 129 (figure 134).
If the panels are equipped with capacitive voltage indication, checking the off-circuit condition can be
carried out by means of this device. In this case, proceed according to the manufacturer's instructions
or the indicators. (Optionally, switchgear can be equipped with various types of indicators coming from
various manufacturers).
In case of any doubt about correct operation of capacitive voltage indication, the off-circuit condition
must be checked using a HV tester.
Checking the off-circuit condition must always be carried out in compliance with the relevant safety
regulations and local operating conditions!

6.3.2 Current and voltage tests

The testing and earthing module 142 (figure 129) is available for carrying out current and voltage tests.
It is also suitable for supplying primary current to any current transformers which may be fitted during
measurements in the protection circuit and, for example, for application of a test voltage during
insulating tests.
• Isolate and secure the working area in accordance with the IEC safety regulations;
• For primary current supply, fix the connecting cable of the test transformer to the contact pins 142.7;
• For AC voltage tests, ball 142.4 is required on the contact pin. The bore in the ball is used for
connection of the voltage supply;
• For current tests, for example of small connected generators, the short-circuit bridge 142.8 must be
fixed onto the contact pins.
Note
With voltage tests at power frequency withstand voltage and/or impulse voltage, carry out the following
procedure:
• Disconnect any voltage transformers and capacitive dividers and cover them with an insulating plate.
12.1
4.3
4.2
5
12.2
Figure 133: View inside the circuit-breaker compartment,
withdrawable part removed, shutters open
4.1 Isolating contact
5 Isolating tulip
12.2 Lower shutter
5
4.1
12.2